July 2011 Doc ID 12634 Rev 2 1/8
8
BAT48
Small signal Schottky diode
Features
■Low leakage current losses
■Negligible switching losses
■Low forward and reverse recovery times
■Extremely fast switching
■Surface mount device
■Low capacitance diode
Description
The BAT48 series uses 40 V Schottky barrier
diodes packaged in SOD-123, SOD-323 or
DO-35. This series is general purpose and
features very low turn-on voltage and fast
switching.
Table 1. Device summary
Symbol Value
IF350 mA
VRRM 40 V
C (typ) 18 pF
Tj (max) 150 °C
SOD-123
SOD-323
BAT48ZFILM
(Single)
BAT48JFILM
(Single)
BAT48RL
Configurations in top view
Band indicates cathode
K
A
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Characteristics BAT48
2/8 Doc ID 12634 Rev 2
1 Characteristics
Table 2. Absolute ratings (limiting values at Tj = 25 °C, unless otherwise specified)
Symbol Parameter Value Unit
VRRM Repetitive peak reverse voltage 40 V
IFContinuous forward current 350 mA
IFSM
Surge non repetitive forward
current
tp = 10 ms
sinusoidal
SOD-123, SOD-323 2
A
DO-35 7.5
Tstg Storage temperature range -65 to +150 °C
Tj
Maximum operating junction temperature
range
SOD-123, SOD-323 -40 to +150
°C
DO-35 -40 to +125
TL
Maximum temperature for soldering during
10 s
SOD-123, SOD-323 260
°C
DO-35 at 4 mm from
case 230
Table 3. Thermal parameters
Symbol Parameter Value Unit
Rth(j-a) Junction to ambient(1)
1. Epoxy printed circuit board with recommended pad layout
SOD-123 500 °C/W
SOD-323 550
Rth(j-l) Junction to lead(2)
2. On infinite heatsink with 4 mm lead length
DO-35 300 °C/W
BAT48 Characteristics
Doc ID 12634 Rev 2 3/8
Table 4. Static electrical characteristics
Symbol Parameter Test conditions Min. Typ. Max. Unit
VBR Breakdown reverse voltage Tj = 25 °C Ir = 25 µA 40 V
IR(1) Reverse leakage current
Tj = 25 °C
VR = 1.5 V 1
µA
VR = 10 V 2
VR = 20 V 5
VR = 40 V 25
Tj = 60 °C
VR = 1.5 V 10
VR = 10 V 15
VR = 20 V 25
VR = 40 V 50
VF(2) Forward voltage drop Tj = 25 °C
IF = 0.1 mA 0.25
V
IF = 1 mA 0.3
IF = 10 mA 0.4
IF = 50 mA 0.5
IF = 200 mA 0.75
IF = 500 mA 0.9
1. Pulse test: tp = 5 ms, δ < 2 %
2. Pulse test: tp = 380 µs, δ < 2 %
Table 5. Dynamic characteristics
Symbol Parameter Test conditions Min. Typ. Max. Unit
C Diode capacitance VR = 0 V, F = 1 MHz 30 pF
VR = 1 V, F = 1 MHz 18
Figure 1. Average forward power dissipation
versus average forward current
Figure 2. Average forward current versus
ambient temperature (δ = 1)
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40
P(W)
T
δ=tp/T tp
δ= 1
δ= 0.05
I (A)
F(AV)
δ= 0.1 δ= 0.2 δ= 0.5
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0 25 50 75 100 125 150
I (A)
F(AV)
T (°C)
amb
T
δ=tp/T tp
Characteristics BAT48
4/8 Doc ID 12634 Rev 2
Figure 3. Reverse leakage current versus
reverse applied voltage
(typical values)
Figure 4. Reverse leakage current versus
junction temperature
(typical values)
1.E-01
1.E+00
1.E+01
1.E+02
1.E+03
1.E+04
0 5 10 15 20 25 30 35 40
I (µA)
R
V (V)
R
T =25°C
j
T =125°C
j
T =100°C
j
T =75°C
j
T =50°C
j
1.E-01
1.E+00
1.E+01
1.E+02
1.E+03
1.E+04
0 25 50 75 100 125
I (µA)
R
T (°C)
j
V =40V
R
Figure 5. Junction capacitance versus
reverse applied voltage
(typical values)
Figure 6. Forward voltage drop versus
forward current (typical values)
0
5
10
15
20
25
30
35
0 5 10 15 20 25 30 35 40
C(pF)
V (V)
R
F=1MHz
V =30mV
T =25°C
OSC RMS
j
1.E-04
1.E-03
1.E-02
1.E-01
1.E+00
0.0 0.2 0.4 0.6 0.8 1.0
I (A)
FM
V (V)
FM
T =125°C
j
T =25°C
j
Figure 7. Relative variation of thermal
impedance junction to ambient
versus pulse duration (SOD-323)
Figure 8. Thermal resistance junction to
ambient versus copper surface
under each lead (SOD-323)
0.01
0.10
1.00
1.E-02 1.E-01 1.E+00 1.E+01 1.E+02
Z/R
th(j-a) th(j-a)
SOD-323
Epoxy FR4
S = 2.25 mm
e = 35 µm
CU 2
CU
Single pulse
t (s)
p
epoxy FR4 with recommended pad layout, e = 35 µm
CU
300
350
400
450
500
550
600
0 5 10 15 20 25 30 35 40 45 50
S (mm²)
CU
R (°C/W)
th(j-a)
printed circuit board, epoxy FR4, e =35 µm
CU
BAT48 Package information
Doc ID 12634 Rev 2 5/8
2 Package information
●Epoxy meets UL94,V0
●Lead-free packages
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
Figure 9. SOD-123 footprint, dimensions in mm (inches)
Table 6. SOD-123 dimensions
Ref.
Dimensions
Millimeters Inches
Min. Max. Min. Max.
A 1.45 0.057
A1 0 0.1 0 0.004
A2 0.85 1.35 0.033 0.053
b 0.55 Typ. 0.022 Typ.
c 0.15 Typ. 0.039 Typ.
D 2.55 2.85 0.1 0.112
E 1.4 1.7 0.055 0.067
G0.25 0.01
H 3.55 3.75 0.14 0.148
H
b
D
E
A1
A2
A
G
c
4.00
(0.157)
0.57
(0.022)
2.70
(0.106)
0.65
(0.026)
0.65
(0.026)
Package information BAT48
6/8 Doc ID 12634 Rev 2
Figure 10. SOD-323 footprint (dimensions in mm)
Table 7. SOD-323 dimensions
Ref.
Dimensions
Millimeters Inches
Min. Max. Min. Max.
A 1.17 0.046
A1 0 0.1 0 0.004
b 0.25 0.44 0.01 0.017
c 0.1 0.25 0.004 0.01
D 1.52 1.8 0.06 0.071
E 1.11 1.45 0.044 0.057
H 2.3 2.7 0.09 0.106
L 0.1 0.46 0.004 0.02
Q1 0.1 0.41 0.004 0.016
Table 8. DO-35 dimensions
Ref.
Dimensions
Millimeters Inches
Min. Max. Min. Max.
A 3.05 4.50 0.120 0.177
B 1.53 2.00 0.060 0.079
C 12.7 0.500
D 0.458 0.558 0.018 0.022
H
b
D
E
A1
A
L
Q1
c
3.20
0.54
1.081.06 1.06
ØB
ØD
A
CC
BAT48 Ordering information
Doc ID 12634 Rev 2 7/8
3 Ordering information
4 Revision history
Table 9. Ordering information
Order code Marking Package Weight Base qty Delivery mode
BAT48ZFILM Z48 SOD-123 Single 10 mg 3000 Tape and reel
BAT48JFILM 48 SOD-323 Single 5 mg 3000 Tape and reel
BAT48RL BAT48 DO-35 15 mg 4000 Tape and reel
Table 10. Document revision history
Date Revision Changes
08-Aug-2006 1 Initial release.
07-Jul-2011 2 Updated package information for SOD-123. Added DO-35 package.
BAT48
8/8 Doc ID 12634 Rev 2
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