FEATURES
• Fully qualified to Class H or K
• -55°C to +125°C operation
• 16 to 40 VDC input
• Fully Isolated
• Rad hard optocoupler feedback
• Fixed frequency, 550 kHz typical
• Topology – Single Ended Forward
• Transient protection 50 V/120 ms
• Inhibit function
• Sync function
• Indefinite short circuit protection
• Undervoltage lockout
• Up to 82% efficiency
DESCRIPTION
The SMHF Series™ of 28 V DC/DC converters offers a wide
input voltage range of 16 to 40 volts and up to 15 watts of
output power. The units are capable of withstanding short term
transients up to 50 volts. The package is a hermetically sealed,
projection-welded metal case. Flanged and non-flanged models
are available.
Screening
SMHF converters offer screening options to Space Prototype (O),
Class H, or Class K. Radiation tolerant to Radiation Hardness
Assurance (RHA) levels of “-” (O) or “R”, per MIL-PRF-38534.
Interpoint model numbers use an “O” in the RHA designator posi-
tion to indicate the “-” (dash) Radiation Hardness Assurance level
of MIL-PRF-38534, which is defined as “no RHA”. See “Class H
and K, MIL-PRF-38534 Screening” tables for more information.
converter DeSign
The SMHF converters are switching regulators that use a quasi-
square wave, single-ended forward converter design with a
constant switching frequency of 550 kHz. Isolation between input
and output circuits is provided with a transformer in the forward
path and a temperature compensated opto-coupler in the feed-
back control loop. The opto-coupler is radiation hardened and is
especially selected for space applications.
For the SMHF dual output models, cross regulation is maintained
by tightly coupled output magnetics. Up to 70% of the total output
power is available from either output, providing the opposite
output is simultaneously carrying 30% of the total output power.
Predictable current limit is accomplished by directly monitoring
the output load current and providing a constant current output
above the overload point.
HigHer Power DenSity
The SMHF Series offers a new standard of performance for small
size and high power density. At just 0.33 inch high and a total
footprint of 1.7 in2, this low profile package offers a total power
density of up to 30 watts per cubic inch.
Low noiSe, HigH AuDio rejection
The SMHF converter’s feed-forward compensation system
provides excellent dynamic response and noise rejection. Audio
rejection is typically 50 dB. Typical output voltage response for
a 50% to 100% step load transient is as low as 1.3% with a 150
µS recovery time. Input ripple current is typically 35 mA p-p with
output ripple voltage typically 50 mV p-p .
inHibit Function
SMHF converters provide an inhibit terminal that can be used
to disable internal switching, resulting in no output and very low
quiescent input current. The converter is inhibited when a logic
low (≤0.8 – output disabled) is applied to the inhibit pin. The
unit is enabled when the pin, which is internally connected to a
pull-up resistor, is left unconnected or is connected to an open-
collector gate. The open circuit output voltage associated with the
inhibit pin is 8.5 to 12 VDC. In the inhibit mode, a maximum of
4 mA must be sunk from the inhibit pin at 28 VDC input.
MODELS
vDc
SINGLE
2.5
3.3
5
12
15
DUAL
±5
±12
±15
Crane Aerospace & Electronics Power Solutions
SMHF Single and Dual DC/DC Converters
Crane Aerospace & Electronics
Electronics Group (Interpoint Brand)
PO Box 97005 • Redmond WA 98073-9705
425.882.3100 • electronics@craneae.com
www.craneae.com
Page 1 of 15
Rev D - 20070404
28 VOLT INPUT – 15 WATT
SyncHronizAtion
A synchronization feature is included with the SMHF Series that
allows the user to match the switching frequency of the converter
to the frequency of the system clock. This allows the user
to adjust the nominally 550 kHz operating frequency to any
frequency within the range of 500 kHz to 600 kHz. This is initiated
by applying a compatible input of the desired frequency to pin 5.
The initial transition on the sync pin should be a negative transi-
tion (i.e. from high state to low state)
SHort circuit Protection
SMHF Series converters provide short circuit protection by
restricting the output current to approximately 115% of the
full load output current. The output current is sensed in the
secondary stage to provide highly predictable and accurate
current limiting, and to eliminate foldback characteristics.
unDervoLtAge Lockout
Undervoltage lockout prevents the units from operating below
approximately 14 VDC input voltage to keep system current
levels smooth, especially during initialization or re-start opera-
tions.
PWM
Controller
ID
IC
Limit Ref.
Output
Common
Positive
Output
Positive
Input
Inhibit
Input
Common
5 µH
2 µF
FET
Driver
Figure 1: SMHF Single Output - BlOck DiagraM
Crane Aerospace & Electronics Power Solutions
SMHF Single and Dual DC/DC Converters
Page 2 of 15
Rev D - 20070404
28 VOLT INPUT – 15 WATT
www.craneae.com
OPERATING CONDITIONS AND CHARACTERISTICS
Input Voltage Range
• 16 to 40 VDC continuous
• 50 V for up to 50 msec transient
Power Dissipation (Pd)
• 8 W
Output Power
• up to 15 watts depending on model
Lead Soldering Temperature (10 sec per lead)
• 300°C
Storage Temperature Range (Case)
• -65°C to +150°C
Case Operating Temperature (Tc)
• -55°C to +125°C full power
• -55°C to +135°C absolute
Derating Output Power/Current (Tc)
• Linearly from 100% at 125°C to 0% at 135°C
Output Voltage Temperature Coefficient
• 100 ppm /°C typical
• 150 ppm/°C maximum
Input to Output Capacitance
• 60 pF typical
Current Limit
• 115% of full load typical
Isolation
• 100 megohm minimum at 500 VDC
• Any pin to case, except case pin
Audio Rejection
• 50 dB typical
Conversion Frequency (º55°C to +125°C Tc)
• Free run 550 kHz typical
480 kHz min, 620 kHz max
Inhibit Pin Voltage (unit enabled)
• 8.5 to 12 V
Undervoltage Lockout
• 14 V input typical
MECHANICAL AND ENVIRONMENTAL
Size (maximum)
Non flanged
1.460 x 1.130 x 0.330 (37.08 x 28.70 x 8.38 mm). See case E1 for dimensions.
Flanged
2.005 x 1.130 x 0.330 (50.93 x 28.70 x 8.38 mm). See case G1 for dimensions.
Weight (maximum)
30 grams typical
Screening
Space Prototype, Class H, or Class K
Radiation tolerant to Radiation Hardness Assurance (RHA) levels of “-” (O) or “R”, per MIL-STD-38534. Interpoint model numbers use an “O” in the
RHA designator position to indicate the “-” (dash) Radiation Hardness Assurance level of MIL-PRF-38534, which is defined as “no RHA”.
See “Class H and K, MIL-PRF-38534 Screening” tables for more information.
Available configurations: OO, HO, HR, KR
SYNC AND INHIBIT
Sync In (500 to 600 kHz)
• Duty cycle 40% to 60%
• Logic low 0.8 V max
• Logic high 4.5 V min, 5 V max
• Referenced to input common
• If not used, connect to input common
Inhibit TTL Open Collector
• Logic low (output disabled)
Logic low voltage ≤0.8 V max
Inhibit pin current 12 mA max
• Referenced to input common
• Logic high (output enabled)
Open collector or unconnected
Crane Aerospace & Electronics Power Solutions
SMHF Single and Dual DC/DC Converters
Page 3 of 15
Rev D - 20070404
28 VOLT INPUT – 15 WATT
www.craneae.com
Figure 2: pin Out
BOTTOM VIEW
SMHF SINGLE AND DUAL
NON-FLANGED OR FLANGED
Dot on top of cover
indicates pin one.
Dotted line outlines flanged package option.
1 2345
8 7 6
See cases E1 and G1 for dimensions.
1. If Sync is not used, pin 5 should be connected directly to input common.
Pin Single Output Dual Output
1 Inhibit Inhibit
2 No connection Positive Output
3 Output Common Output Common
4 Positive Output Negative Output
51 Sync Sync
6 Case Ground Case Ground
7 Input Common Input Common
8 Positive Input Positive Input
PIN OUT
Crane Aerospace & Electronics Power Solutions
SMHF Single and Dual DC/DC Converters
Page 4 of 15
Rev D - 20070404
28 VOLT INPUT – 15 WATT
www.craneae.com
MODEL NUMBERING KEY
SMHF 28 05 S F / K R
Base Model
Input Voltage
Output Voltage
Screening
Number of Outputs
(S = single, D = dual)
Radiation Level
Case Option
(Non-flanged case has no designator
in this position)
SMD NUMBERS
StanDarD MicrOcircuit
Drawing (SMD)
IN PROCESS
5962-0251002HXC
5962-9213902HXC
5962-9166402HXC
5962-9160102HXC
5962-9555902HXC
5962-9214402HXC
5962-9161402HXC
SMHF SiMilar part
SMHF282R5S/HO
SMHF283R3S/HO
SMHF2805S/HO
SMHF2812S/HO
SMHF2815S/HO
SMHF2805D/HO
SMHF2812D/HO
SMHF2815D/HO
To indicate the flanged case option change the “X” to “Z” In
the SMD number. The SMD number shown is for Class H
screening, non-flanged, and no Radiation Hardness Assurance
(RHA) level. See the SMD for the numbers for other screening
and radiation levels. For exact specifications for an SMD
product, refer to the SMD drawing. Call your Interpoint
representative for status on the SMHF SMD releases which
are “in process.” SMDs can be downloaded from:
http://www.dscc.dla.mil/programs/smcr
MODEL SELECTION
SMHF28 /
Base model Vout value number of outputs case option screening
Choose one from each of the following rows
Vout value for singles 2.5, 3.3, 5, 12, 15 for duals: 5, 12, 15
“R” = decimal point, 3R3 = 3.3VDC
Number of outputs S (single) or D (dual)
Case option non-flanged, leave blank F - flanged
Screening OO* - Space prototype, HO, HR, KR
*Interpoint model numbers use an “O” in the RHA designator position to indicate the “-” (dash) Radiation Hardness Assurance level
of MIL-PRF-38534, which is defined as “no RHA”
Crane Aerospace & Electronics Power Solutions
SMHF Single and Dual DC/DC Converters
Page 5 of 15
Rev D - 20070404
28 VOLT INPUT – 15 WATT
www.craneae.com
Notes
1. Guaranteed by design, not tested.
2. Indefinite short circuit protection not guaranteed above 125°C (case)
3. Recovery time is measured from application of the transient
to the point at which Vout is within regulation.
4. Step transition time >10µs.
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, radiation level O, unless otherwise specified.
SINGLE OUTPUT MODELS SMHF282R5S SMHF283R3S SMHF2805S
unitS
paraMeter cOnDitiOnS MIN TYP MAX MIN TYP MAX MIN TYP MAX
Output VOltage tc = 25°c 2.475 2.5 2.525 3.27 3.30 3.33 4.95 5.00 5.05 VDc
Output current Vin = 16 tO 40 VDc — — 2.4 — — 2.4 — — 2.4 a
Output pOwer Vin = 16 tO 40 VDc 0 — 6 0 — 8 0 — 12 w
Output ripple 10 kHz - 2 MHz— 15 50
— 25 50
— 60 160
— 80 240
— 30 80
— 150 240
mV p-p
tc = -55°c tO +125°c
line regulatiOn Vin = 16 tO 40 VDc — 5 50 — 5 100 — 5 100 mV
lOaD regulatiOn nO lOaD tO Full — 28 50 — 20 50 — 20 50 mV
input VOltage
nO lOaD tO Full
cOntinuOuS 16 28 40
0 — 50
16 28 40
0 — 50
16 28 40
0 — 50
VDc
V
TRANSIENT 120 ms1
input current nO lOaD — 20 40
— 6 12
— 25 65
— 5 12
— 25 40
— 5 12
mA
inHiBiteD
input ripple
current
10 kHz - 10 MHz
tc = -55°c tO +125°c
— 30 50
— — 50
— 45 80
— — 120
— 35 80
— — 120 mA p-p
eFFiciencY tc = 25°c 65 67 — 68 73 — 73 75 — %
lOaD Fault2SHOrt circuit
pOwer DiSSipatiOn — 3 6
— 7.5 30
— 5 8
— 7.5 30
— 3.5 8
— 7.5 30
w
ms
recOVerY1, 3
Step lOaD
reSpOnSe
50% - 100% - 50%
tranSient4
-200 50 200
— 50 270
-400 150 400
— 150 300
-500 150 500
— 150 300
mV pk
mS
recOVerY3
Step line
reSpOnSe1
16 - 40 -16 VDc
tranSient4
-800 550 800
— 0.8 1.2
-800 550 800
— 0.8 1.2
-800 550 800
— 0.8 1.2
mV pk
MS
recOVerY3
Start-up
0 tO 28 VDc
DelaY — 10 20
— — 250
— 10 25
— 200 300
— 10 25
— 100 600
ms
mV pk
OVerSHOOt1, 4
capacitiVe lOaD tc = 25°c — — — — — 300 — — 300 µF
Crane Aerospace & Electronics Power Solutions
SMHF Single and Dual DC/DC Converters
Page 6 of 15
Rev D - 20070404
28 VOLT INPUT – 15 WATT
www.craneae.com
Notes
1. Guaranteed by design, not tested.
2. Indefinite short circuit protection not guaranteed above 125°C
(case)
3. Recovery time is measured from application of the transient
to the point at which Vout is within regulation.
4. Step transition time >10µs.
SINGLE OUTPUT MODELS SMHF2812S SMHF2815S
unitS
paraMeter cOnDitiOnS MIN TYP MAX MIN TYP MAX
Output VOltage tc = 25°c 11.88 12.00 12.12 14.85 15.00 15.15 VDc
Output current Vin = 16 tO 40 VDc — — 1.25 — — 1.00 a
Output pOwer Vin = 16 tO 40 VDc 0 — 15 0 — 15 w
Output ripple 10 kHz - 2 MHz— 60 150
— 50 200
— 60 175
— 100 260
mV p-p
tc = -55°c tO +125°c
line regulatiOn Vin = 16 tO 40 VDc — 5 100 — 5 100 mV
lOaD regulatiOn nO lOaD tO Full — 20 50 — 20 50 mV
input VOltage
nO lOaD tO Full
cOntinuOuS 16 28 40
0 — 50
16 28 40
0 — 50
VDc
V
TRANSIENT 120 ms1
input current nO lOaD — 25 55
— 5 12
— 25 62
— 5 12
mA
inHiBiteD
input ripple
current
10 kHz - 10 MHz
tc = -55°c tO +125°c
— 35 80
— — 120
— 35 80
— — 120 mA p-p
eFFiciencY tc = 25°c 76 79 — 78 80 — %
lOaD Fault2SHOrt circuit
pOwer DiSSipatiOn — 3.5 8
— 7.5 30
— 3.5 8
— 7.5 30
w
ms
recOVerY1, 3
Step lOaD
reSpOnSe
50% - 100% - 50%
tranSient4
-700 150 700
— 150 1000
-800 200 800
— 600 1200
mV pk
µS
recOVerY3
Step line
reSpOnSe1
16 - 40 -16 VDc
tranSient4
-800 550 800
— 0.8 1.2
-800 550 800
— 0.8 1.2
mV pk
MS
recOVerY3
Start-up
0 tO 28 VDc
DelaY — 10 25
— 200 1200
— 10 25
— 200 1500
ms
mV pk
OVerSHOOt1, 4
capacitiVe lOaD tc = 25°c — — 100 — — 100 µF
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, radiation level O, unless otherwise specified.
Crane Aerospace & Electronics Power Solutions
SMHF Single and Dual DC/DC Converters
Page 7 of 15
Rev D - 20070404
28 VOLT INPUT – 15 WATT
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Notes
1. Guaranteed by design, not tested.
2. Up to 70% of the total output power is available from either output providing the
opposite output is simultaneously carrying 30% of the total output power. Each
output must carry a minimum of 30% of the total output
power in order to maintain regulation on the negative output.
3. Effect on –Vout for the following conditions, percentages are of total power:
+Po = 50% to 10% and –Po = 50%, +Po = 50% and –Po = 50% to 10%
and from +Po = 70%/–Po = 30% to +Po = 30%/–Po = 70%
all conditions are referenced to the balanced loads condition: 50%/50%
4. Indefinite short circuit protection not guaranteed above 125°C (case)
5. Recovery time is measured from application of the transient to point at
which Vout is within regulation.
6. Response of either output with the opposite output held at half of the total output
power.
7. Step transition time >10µs.
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, radiation level O, unless otherwise specified.
DUAL OUTPUT MODELS SMHF2805D SMHF2812D SMHF2815D unitS
paraMeter cOnDitiOnS MIN TYP MAX MIN TYP MAX MIN TYP MAX
Output VOltage + VOut 4.95 5.00 5.05
4.92 5.00 5.08
11.88 12.00 12.12
11.82 12.00 12.18
14.85 15.00 15.15
14.78 15.00 15.23
VDc
- VOut
Output current2Vin = 16 tO 40 VDc — ±1.2 1.68 — ±0.625 0.875 — ±0.5 0.7 a
Output pOwer2Vin = 16 tO 40 VDc — — 12 — — 15 — — 15 w
Output ripple
± VOut
10 kHz - 2 MHz— 60 160
— 100 240
— 70 175
— 100 275
— 70 175
— 100 275
mV p-p
tc = -55°c tO +125°c
line regulatiOn
Vin = 16 tO 40 VDc BalanceD lOaD
+ VOut — 5 50
— — 100
— 5 50
— — 100
— 5 50
— — 100
mV
- VOut
lOaD regulatiON
NO LOAD TO FULL BalanceD lOaD
+ VOut — 20 50
— — 150
— 20 50
— — 150
— 20 50
— — 150
mV
- VOut
crOSS regulatiOn3eFFect On - VOut — 6 7.5 — 3 6 — 3 6 %
input VOltage
nO lOaD tO Full
cOntinuOuS 16 28 40
— — 50
16 28 40
— — 50
16 28 40
— — 50
VDc
V
TRANSIENT 50 ms1
input current nO lOaD — 20 50
— 6 12
— 25 50
— 5 12
— 25 50
— 5 12 mA
inHiBiteD
input ripple
current
10 kHz - 10 MHz— 30 80
— 60 120
— 40 80
— 55 120
— 40 80
— 55 120
mA p-p
tc = -55°c tO +125°c
eFFiciencY 75 77 — 76 81 — 76 82 — %
lOaD Fault4SHOrt circuit
pOwer DiSSipatiOn — 3 6
— 7.5 30
— 3 6
— 7.5 50
— 3 6
— 7.5 50
w
ms
recOVerY1, 5
Step lOaD
reSpOnSe6
BalanceD lOaDS
50% - 100% - 50%
tranSient7+ VOut -600 200 600
-600 150 600
— 150 500
-600 300 600
-600 100 600
— 200 500
-600 300 600
-600 100 600
— 200 600
mV pk
mV pk
mS
- VOut
recOVerY5
Step line
reSpOnSe1
± VOut
16 - 40 -16 VDc tranSient7-800 600 800
— 0.8 1.2
-750 550 750
— 0.8 1.2
-750 550 750
— 0.8 1.2
mV pk
MS
recOVerY5
Start-up
0 tO 40 V
DelaY — 12 30
0 100 500
— 12 25
0 200 500
— 12 25
0 200 500
ms
mV pk
OVerSHOOt1, 7
capacitiVe lOaD tc = 25°c — — 47 — — 10 — — 10 µF
Crane Aerospace & Electronics Power Solutions
SMHF Single and Dual DC/DC Converters
Page 8 of 15
Rev D - 20070404
28 VOLT INPUT – 15 WATT
www.craneae.com
OUTPUT POWER (Watts)
SMHF2805D EFFICIENCY
EFFICIENCY (%)
40
90
80
70
60
50
2
4 6 8 10 12
40V
28V
16V
OUTPUT POWER (Watts)
SMHF2815D EFFICIENCY
EFFICIENCY (%)
40
90
80
70
60
50
2 4 6 8 10 12 14
40V
28V
16V
OUTPUT POWER (Watts)
SMHF2812D EFFICIENCY
EFFICIENCY (%)
40
90
80
70
60
50
2 4 6 8 10 12 14
40V
28V
16V
15
Figure 6 Figure 8
Figure 7
OUTPUT POWER (Watts)
SMHF 2805S EFFICIENCY
EFFICIENCY (%)
40
90
80
70
60
50
2 4 6 8 10 12
16V
28V
40V
OUTPUT POWER (Watts)
SMHF2812S EFFICIENCY
EFFICIENCY (%)
40
90
80
70
60
50
2
4 6 8 10 12 14
16V
40V
28V
15
Figure 3 Figure 4 Figure 5
OUTPUT POWER (Watts)
SMHF2815S EFFICIENCY
EFFICIENCY (%)
40
90
80
70
60
50
2 4 6 8 10 12 14
16V
40V
15
28V
FREQUENCY (kHz)
SMHF SERIES AUDIO REJECTION
ATTENUATION (dB)
–1000.1 1 10 100
–90
–80
–70
–60
–50
–40
–20
–10
0
–30
1ms/div
16V TO 40V
SMHF2805S STEP LINE RESPONSE
500mV/div.
VIN
20V/div.
VOUT
Figure 9 Figure 10 Figure 11
50µs/div
50% 100%
SMHF2805S STEP LOAD RESPONSE
100mV/div.
50% to 100%
100% to 50%
Typical Performance Curves: 25°C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified.
Crane Aerospace & Electronics Power Solutions
SMHF Single and Dual DC/DC Converters
Page 9 of 15
Rev D - 20070404
28 VOLT INPUT – 15 WATT
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POSITIVE OUTPUT LOAD (% OF TOTAL LOAD)
–VOUT WITH SHIFT IN LOAD BALANCE
CROSS REGULATION
–V
OUT
VOLTAGE CHANGE (%)
–10 1000 20 40 60 80
–5
0
5
10
2812D
2815D
2805D
OUTPUT POWER (Watts)
50 mV DROP
LOW LINE DROPOUT VS. LOAD
INPUT VOLTAGE (Volts)
10 11 12 13 14 15
14
15
16
SMHF2812S&D
SMHF2815S&D
SMHF2805S&D
13
12
OUTPUT LOAD (%)
COND. A: 50% LOAD +V; 50% to 10% –V
COND. B: 50% LOAD –V; 50% to 10% +V
SMHF2805D/SMHF2812D/SMHF2815D
CROSS REGULATION
–V
OUT
VOLTAGE CHANGE (%)
–10
0
10
10 20 30 40 50
–8
–6
–4
–2
2
4
6
8
2815D
2812D
2812D
COND B
COND A
2805D
2805D
Figure 18 Figure 20Figure 19
50µs/div
50% 100%
SMHF2815D +V
OUT
STEP LOAD RESPONSE
100mV/div.
50% to 100%
100% to 50% PO= 7.5 W
Figure 15 Figure 16 Figure 17
2 ms/div
SMHF2815D TURN-ON INTO FULL LOAD
20V/div.
V
IN
5V/div.
+VOUT
–VOUT
200µs/div
10% 100%
SMHF2805S STEP LOAD RESPONSE
100mV/div.
10% to 100%
100% to 10%
1 ms/div
16V TO 40V
SMHF2815D STEP LINE RESPONSE
200mV/div.
V
IN
20V/div.
+VOUT
2 ms/div
SMHF2805S TURN-ON INTO FULL LOAD
1V/div.
V
IN
20V/div.
VOUT POUT= 12W
Figure 12 Figure 14
Figure 13
Typical Performance Curves: 25°C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified.
Crane Aerospace & Electronics Power Solutions
SMHF Single and Dual DC/DC Converters
Page 10 of 15
Rev D - 20070404
28 VOLT INPUT – 15 WATT
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0.000
0.205 (5.21)
0.505 (12.83)
0.705 (17.91)
0.905 (22.99)
1.105 (28.07)
0.330 max.
(8.38)
0.000
0.25 (6.35)
0.000
0.160 (4.06)
0.960 (24.38)
1 2 3 4 5
0.030 dia.
(0.76)
8 7 6
BOTTOM VIEW CASE E1
Projection Weld Squared corner and dot on top
of case indicate pin one.
Case dimensions in inches (mm)
Tolerance ±0.005 (0.13) for three decimal places
±0.01 (0.3) for two decimal places
unless otherwise specified
CAUTION
Heat from reflow or wave soldering may damage the device.
Solder pins individually with heat application not exceeding 300°C for 10 seconds per pin.
Materials
Header Cold Rolled Steel/Nickel/Gold
Cover Kovar/Nickel
Pins #52 alloy/Gold compression glass seal
Case E1, Rev C, 20061221
Please refer to the numerical dimensions for accuracy. All information is believed to be accurate,
but no responsibility is assumed for errors or omissions. Interpoint reserves the right to make
changes in products or specifications without notice.
Copyright © 1999-2006 Interpoint Corp. All rights reserved.
1.130 max. (28.70)
1.460 max. (37.08)
Figure 21: caSe e1
Crane Aerospace & Electronics Power Solutions
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Rev D - 20070404
SMHF Single and Dual DC/DC Converter Cases
28 VOLT INPUT – 15 WATT
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1.590 (40.39)
0.128 dia
(3.25)
0.030 dia.
(0.76)
Flanged cases: Designator "F" required in Case Option position of model number.
BOTTOM VIEW CASE G1
0.000
0.205 (5.21)
0.505 (12.83)
0.705 (17.91)
0.905 (22.99)
1.105 (28.07)
0.000
0.160 (4.06)
0.960 (24.38)
1 2 3 4 5
8 7 6
0.140 (3.56)
0.560 (14.22)
0.330 max.
(8.38)
0.000
0.25 (6.35)
Squared corner and dot on top
of case indicate pin one.
Projection Weld
Case dimensions in inches (mm)
Tolerance ±0.005 (0.13) for three decimal places
±0.01 (0.3) for two decimal places
unless otherwise specified
CAUTION
Heat from reflow or wave soldering may damage the device.
Solder pins individually with heat application not exceeding 300°C for 10 seconds per pin.
Materials
Header Cold Rolled Steel/Nickel/Gold
Cover Cold Rolled Steel/Nickel/Gold
Pins #52 alloy/Gold compression glass seal
Case G1, Rev C, 20061221
Please refer to the numerical dimensions for accuracy. All information is believed to be accurate,
but no responsibility is assumed for errors or omissions. Interpoint reserves the right to make
changes in products or specifications without notice.
Copyright © 1999-2006 Interpoint Corp. All rights reserved.
1.130 max. (28.70)
Flange thickness: 0.047 (1.19)
2.005 max
(50.93)
2.005 max. (50.93)
Figure 22: caSe g1
Crane Aerospace & Electronics Power Solutions
Page 12 of 15
Rev D - 20070404
SMHF Single and Dual DC/DC Converter Cases
28 VOLT INPUT – 15 WATT
www.craneae.com
cLASS H AnD k, MiL-PrF-38534 eLeMent evALuAtion
Notes:
1. Non-QML products do not meet all of the requirements of MIL-PRF-38534.
2. M/S = Active components (Microcircuit and Semiconductor Die)
3. P = Passive components
4. Not applicable to EMI filters that have no wirebonds.
Definitions:
Element Evaluation: Component testing/screening per MIL-STD-883 as determined by MIL-PRF-38534
SEM: Scanning Electron Microscopy
SLAM™: Scanning Laser Acoustic Microscopy
C-SAM: C - Mode Scanning Acoustic Microscopy
SPAce
teSt PerForMeD PrototyPe o cLASS H cLASS k
non-QML1 QML QML
(coMPonent LeveL) M/S2 P3 M/S2 P3 M/S2 P3
Element Electrical yes no yes yes yes yes
Element Visual no no yes yes yes yes
Internal Visual no N/A yes N/A yes N/A
Temperature Cycling no no no no yes yes
Constant Acceleration no no no no yes yes
Interim Electrical no N/A no N/A yes N/A
Burn-in no N/A no N/A yes N/A
Post Burn-in Electrical no N/A no N/A yes N/A
Steady State Life no N/A no N/A yes N/A
Voltage Conditioning Aging N/A no N/A no N/A yes
Visual Inspection no no N/A no N/A yes
Final Electrical no no yes yes yes yes
Wire Bond Evaluation4 no no yes yes yes yes
SEM no N/A no N/A yes N/A
SLAM™/C-SAM:
Input capacitors only no no no yes no yes
(Add’l test, not req. by H or K)
Crane Aerospace & Electronics Power Solutions
SMHF Single and Dual DC/DC Converters
Page 13 of 15
Rev D - 20070404
28 VOLT INPUT – 15 WATT
www.craneae.com
teSt PerForMeD SPAce
PrototyPe o cLASS cLASS
(enD iteM LeveL) non-QML1 H, QML k, QML
Non-destruct bond pull2
Method 2023 no yes3 yes
Pre-cap Inspection
Method 2017, 2032 yes yes yes
Temperature Cycle (10 times)
Method 1010, Cond. C, -65°C to 150°C, ambient yes yes yes
Constant Acceleration
Method 2001, 3000 g yes yes yes
PIND Test
Method 2020, Cond. A no yes3 yes
Pre burn-in test
yes yes yes
Burn-in
Method 1015, 125°C case, typical
96 hours yes no no
160 hours no yes no
2 x 160 hour (includes mid BI test) no no yes
Final electrical test MIL-PRF-38534
Group A, Subgroups 1 through 6
-55°C, +25°C, +125°C case yes yes yes
Radiography
Method 2012 N/A N/A yes
Post Radiography Electrical Test
Room temperature N/A N/A yes3
Hermeticity test
Fine Leak, Method 1014, Cond. A yes yes yes
Gross Leak, Method 1014, Cond. C yes yes yes
Final visual inspection
Method 2009 yes yes yes
cLASS H AnD k, MiL-PrF-38534 environMentAL Screening
Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534.
Notes:
1. Space Prototype (O), non-QML products, do not meet all of the requirements of MIL-PRF-38534.
2. Not applicable to EMI filters that have no wirebonds.
3. Not required by DSCC but performed to assure product quality.
Crane Aerospace & Electronics Power Solutions
SMHF Single and Dual DC/DC Converters
Page 14 of 15
Rev D - 20070404
28 VOLT INPUT – 15 WATT
www.craneae.com
cLASS H AnD k, MiL-PrF-38534 rADiAtion ASSurAnce
Notes:
1. Our EMI filters are designed exclusively with passive components providing maximum tolerance for space environ-
ment requirements.
2. Interpoint model numbers use an “O” in the RHA designator position to indicate the “-” (dash)
Radiation Hardness Assurance level of MIL-PRF-38534, which is defined as “no RHA”.
3. Space Prototype (O), non-QML products, do not meet all of the requirements of MIL-PRF-38534.
4. Redmond site, Interpoint, has a Radiation Hardness assurance plan on file with DSCC. Our SMD
products with RHA “R" code meet DSCC requirements.
PRODUCT LEVEL AVAILABILITY ENVIRONMENTAL SCREENING LEVELS
SPACE
PROTOTYPE O CLASS H CLASS K
RADIATION HARDNESS non-QML3 QML QML
ASSURANCE LEVELS
O2: Standard, no radiation guarantee
OO HO N/A
R: Radiation tolerant – Tested lots
Up to 100 K Rads (Si) total dose N/A HR4 KR4
SEU guarantee up to 40 MeV
Crane Aerospace & Electronics Power Solutions
SMHF Single and Dual, Rev D - 20070404. This revision supercedes all previous releases. All technical information is believed to be accurate,
but no responsibility is assumed for errors or omissions. Interpoint reserves the right to make changes in products or specifications without notice.
SMHF Series is a trademark of Interpoint. Copyright © 1999 - 2007 Interpoint Corporation. All rights reserved. www.craneae.com
Page 15 of 15
SMHF Single and Dual DC/DC Converters
28 VOLT INPUT – 15 WATT