LM134 Series
1
APPLICATIO S
U
DESCRIPTIO
U
FEATURES
TYPICAL APPLICATIO
U
■
Current Mode Temperature Sensing
■
Constant Current Source for Shunt References
■
Cold Junction Compensation
■
Constant-Gain Bias for Bipolar Differential Stage
■
Micropower Bias Networks
■
Buffer for Photoconductive Cell
■
Current Limiter
■
1µA to 10mA Operation
■
0.02%/V Regulation
■
0.8V to 40V Operating Voltage
■
Can be Used as Linear Temperature Sensor
■
Draws No Reverse Current
■
Supplied in Standard Transistor Packages
Constant Current Source
and Temperature Sensor
The LM134 is a three-terminal current source designed to
operate at current levels from 1µA to 10mA, as set by an
external resistor. The device operates as a true two-
terminal current source, requiring no extra power connec-
tions or input signals. Regulation is typically 0.02%/V and
terminal-to-terminal voltage can range from 800mV to
40V.
Because the operating current is
directly proportional to
absolute temperature
in degrees Kelvin, the device will
also find wide applications as a temperature sensor. The
temperature dependence of the operating current is
0.336%/°C at room temperature. For example, a device
operating at 298µA will have a temperature coefficient of
1µA/°C. The temperature dependence is extremely accu-
rate and repeatable. Devices specified as temperature
sensors in the 100µA to 1mA range are the LM134-3,
LM234-3 and the LM134-6, LM234-6, with the dash
numbers indicating ±3°C and ±6°C accuracies, respec-
tively.
If a zero temperature coefficient current source is re-
quired, this is easily achieved by adding a diode and a
resistor.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Remote Temperature Sensor with Voltage Output Operating Current vs Temperature
V
+
V
–
R
R
SET
226Ω
V
IN
≥ 5V
R1
10k
10mV/°K
LM234-3
TA01a
OPERATING CURRENT (µA)
0
TEMPERATURE (°K)
500
400
300
200
100
0400
TA01b
100 200 300 500
225
125
25
–75
–175
–275
R
SET
= 226Ω
TEMPERATURE (°C)
LM134 Series
2
NC
NC
NC
NC
V
–
R
V
+
NC
S8 PACKAGE
8-LEAD PLASTIC SO
1
2
3
4
8
7
6
5
V
+
to V
–
Forward Voltage
LM134 ................................................................. 40V
LM134-3/LM134-6/LM234-3/
LM234-6/LM334 ................................................. 30V
V
+
to V
–
Reverse Voltage ........................................ 20V
R Pin to V
–
Voltage.................................................... 5V
Set Current ........................................................... 10mA
ORDER PART
NUMBER
T
JMAX
= 150°C, θ
JA
= 440°C/W, θ
JA
= 80°C/W
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
(Note 1)
Consult LTC Marketing for availability of LM234Z-3 and LM234Z-6
Power Dissipation.............................................. 200mW
Operating Temperature Range
LM134 (OBSOLETE) ................... –55°C to 125°C
LM234-3/LM234-6 ............................–25°C to 100°C
LM334 ..................................................... 0°C to 70°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER PART
NUMBER
ORDER PART
NUMBER
S8 PART
MARKING
334
LM334S8
LM134H
LM334H LM134H-3
LM234H-3
LM134H-6
LM234H-6
CURRENT
SOURCE TEMP
SENSOR
T
JMAX
= 100°C, θ
JA
= 160°C/W
T
JMAX
= 100°C, θ
JA
= 180°C/W
LM334Z
CURRENT
SOURCE TEMP
SENSOR
BOTTOM VIEW
Z PACKAGE
3-LEAD PLASTIC TO-92
V
–
V
+
R
BOTTOM VIEW
H PACKAGE
3-LEAD TO-46 METAL CAN
V–
V+
R
LM234Z-3
LM234Z-6
OBSOLETE PACKAGE
Consider the S8 or Z Packages for Alternate Source
LM134 Series
3
ELECTRICAL CHARACTERISTICS
CURRENT SOURCE (Note 2)
LM134-3,LM234-3 LM134-6, LM234-6
SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
∆I
SET
Set Current Error, V
+
= 2.5V 100µA ≤ I
SET
≤ 1mA ±1±2%
(Note 3) T
j
= 25°C
Equivalent Temperature Error ±3±6°C
Ratio of Set Current to 100µA ≤ I
SET
≤ 1mA 141826141826
V
–
Current
V
MIN
Minimum Operating Voltage 100µA ≤ I
SET
≤ 1mA 0.9 0.9 V
∆I
SET
Average Change in Set Current 1.5V ≤ V
+
≤ 5V 0.02 0.05 0.02 0.1 %/V
∆V
IN
with Input Voltage 100µA ≤ I
SET
≤ 1mA
5V ≤ V
+
≤ 30V 0.01 0.03 0.01 0.05 %/V
Temperature Dependence of 100µA ≤ I
SET
≤ 1mA 0.98 1.02 0.97 1.03
Set Current (Note 4)
Equivalent Slope Error ±2±3%
C
S
Effective Shunt Capacitance 15 15 pF
TEMPERATURE SENSOR (Note 2)
LM134 LM334
SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
∆I
SET
Set Current Error, V
+
= 2.5V 10µA ≤ I
SET
≤ 1mA 3 6 %
(Note 3) 1mA < I
SET
≤ 5mA 5 8 %
2µA ≤ I
SET
< 10µA812%
Ratio of Set Current to 10µA ≤ I
SET
≤ 1mA 141823141826
V
–
Current 1mA ≤ I
SET
≤ 5mA 14 14
2µA ≤ I
SET
≤ 10µA 1823 1826
V
MIN
Minimum Operating Voltage 2µA ≤ I
SET
≤ 100µA 0.8 0.8 V
100µA < I
SET
≤ 1mA 0.9 0.9 V
1mA < I
SET
≤ 5mA 1.0 1.0 V
∆I
SET
Average Change in Set Current 1.5V ≤ V
+
≤ 5V 0.02 0.05 0.02 0.1 %/V
∆V
IN
with Input Voltage 2µA ≤ I
SET
≤ 1mA
5V ≤ V
+
≤ V
MAX
(Note 5) 0.01 0.03 0.01 0.05 %/V
1.5V ≤ V ≤ 5V 0.03 0.03 %/V
1mA < I
SET
≤ 5mA
5V ≤ V ≤ V
MAX
(Note 5) 0.02 0.02 %/V
Temperature Dependence of 25µA ≤ I
SET
≤ 1mA 0.96 1.04 0.96 1.04
Set Current (Note 4)
C
S
Effective Shunt Capacitance 15 15 pF
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Unless otherwise specified, tests are performed at T
j
= 25°C with
pulse testing so that junction temperature does not change during test.
Note 3: Set current is the current flowing into the V
+
pin. It is determined
by the following formula: I
SET
= 67.7mV/R
SET
(at 25°C). Set current error
is expressed as a percent deviation from this amount. I
SET
increases at
0.336%/°C at T
j
= 25°C.
Note 4: I
SET
is nominally directly proportional to absolute temperature
(°K). I
SET
at any temperature can be calculated from: I
SET
= I
O
(T/T
O
)
where I
O
is I
SET
measured at T
O
(°K).
Note 5: V
MAX
= 40V for LM134 and 30V for other grades.
LM134 Series
4
Output Impedance
Maximum Slew Rate for
Linear Operation Start-Up
Transient Response Voltage Across RSET Current Noise
Turn-On Voltage Ratio of ISET to V– Current
Operating Current vs
Temperature
TYPICAL PERFOR A CE CHARACTERISTICS
UW
FREQUENCY (Hz)
10
106
IMPEDANCE (Ω)
107
108
109
100 1k 10k
134 G01
I = 100µA
I = 10µA
I = 1mA
ISET (µA)
0.01
SLEW RATE (V/µs)
0.1
1.0
10
1 100 1000
134 G02
0.001 10 10000
10µA
0µA
100µA
0µA
1mA
0mA
5V
0V
I
SET
134 G03
200µs
INPUT
50µs
5µs
TIME
(*NOTE SCALE CHANGES FOR EACH CURRENT LEVEL)
2
1
0
–1
5
0
–5
10
0
–10
–20
∆I
SET
(%)
134 G04
2µs
50µs
10µs
I
SET
= 1mA
I
SET
= 100µA
I
SET
= 10µA
V
+
TO V
–
= 5V
∆V = 0.4V
t
r
,
f
= 500ns
TIME
(*NOTE SCALE CHANGES FOR EACH CURRENT LEVEL)
TEMPERATURE (°C)
–50
VOLTAGE (mV)
86
82
78
74
70
66
62
58
54
50
46 050 75
1314/15 G01
–25 25 100 125
FREQUENCY (Hz)
10
CURRENT (pA/√Hz)
100
1k
10k
10 1k 10k
134 G06
1100 100k
I
SET
= 100µA
I
SET
= 1mA
I
SET
= 5mA
I
SET
= 10µA
V
+
TO V
–
VOLTAGE
10µA
I
SET
1mA
10mA
0.4 0.8 1.21.0
134 G02
1µA0.6 1.4
R
SET
= 68Ω
R
SET
= 680Ω
R
SET
= 6.8k
T
j
= 25°C
R
SET
= 14Ω
100µA
I
SET
10µA
RATIO
21
20
19
18
17
16
15
14
13
12
11 100µA 1mA 10mA
134 G08
OPERATING CURRENT (µA)
0
TEMPERATURE (°K)
500
400
300
200
100
0400
134 G09
100 200 300 500
R
SET
= 226Ω225
125
25
–75
–175
–275
TEMPERATURE (°C)
LM134 Series
5
APPLICATIO S I FOR ATIO
WUUU
Basic Theory of Operation
The equivalent circuit of the LM134 is shown in Figure 1.
A reference voltage of 64mV is applied to the minus input
of A1 with respect to the V
–
pin. A1 serves the drive to Q2
to keep the R pin at 64mV, independent of the value of
R
SET
. Transistor Q1 is matched to Q2 at a 17:1 ratio so that
the current flowing out of the V
–
pin is always 1/18 of the
total current into the V
+
pin. This total current is called I
SET
and is equal to:
64 18
17
67 7mV
R
mV
R
SET SET
=.
Figure 1.
The 67.7mV equivalent reference voltage is directly pro-
portional to absolute temperature in degrees Kelvin (see
curve, “Operating Current vs Temperature”). This means
that the reference voltage can be plotted as a straight line
going from 0mV at absolute zero temperature to 67.7mV
at 298°K (25°C). The slope of this line is 67.7mV/298 =
227µV/°C.
The accuracy of the device is specified as a percent error
at room temperature, or in the case of the -3 and -6
devices, as both a percent error and an equivalent tem-
perature error. The LM134 operating current changes at a
percent rate equal to (100)(227µV/°C)/(67.7mV) = 0.336%/
°C at 25°C, so each 1% operating current error is equiva-
lent to ≈3°C temperature error when the device is used as
a temperature sensor. The slope accuracy (temperature
coefficient) of the LM134 is expressed as a ratio com-
pared to unity. The LM134-3, for instance, is specified at
0.98 to 1.02, indicating that the maximum slope error of
–
+
+
–
R
SET
I
SET
64mV
A1
R
V
–
V
+
Q2Q1
134 F01
the device is ±2% when the room temperature current is
set to the exact desired value.
Supply Voltage Slew Rate
At slew rates above a given threshold (see curve), the
LM134 may exhibit nonlinear current shifts. The slewing
rate at which this occurs is directly proportional to I
SET
. At
I
SET
= 10µA, maximum dv/dt is 0.01V/µs; at I
SET
= 1mA,
the limits is 1V/µs. Slew rates above the limit do not harm
the LM134, or cause large currents to flow.
Thermal Effects
Internal heating can have a significant effect on current
regulation for I
SET
greater than 100µA. For example, each
1V increase across the LM134 at I
SET
= 1mA will increase
junction temperature by ≈0.4°C in still air. Output current
(I
SET
) has a temperature coefficient of ≈0.33%/°C, so the
change in current due to temperature rise will be (0.4)(0.33)
= 0.132%. This is a 10:1 degradation in regulation com-
pared to true electrical effects. Thermal effects, therefore,
must be taken into account when DC regulation is critical
and I
SET
exceeds 100µA. Heat sinking of the TO-46 pack-
age or the TO-92 leads can reduce this effect by more than
3:1.
Shunt Capacitance
In certain applications, the 15pF shunt capacitance of the
LM134 may have to be reduced, either because of loading
problems or because it limits the AC output impedance of
the current source. This can be easily accomplished by
buffering the LM134 with a FET, as shown in the applica-
tions. This can reduce capacitance to less than 3pF and
improve regulation by at least an order of magnitude. DC
characteristics (with the exception of minimum input
voltage) are not affected.
Noise
Current noise generated by the LM134 is approximately 4
times the shot noise of a transistor. If the LM134 is used
as an active load for a transistor amplifier, input referred
noise will be increased by about 12dB. In many cases, this
is acceptable and a single stage amplifier can be built with
a voltage gain exceeding 2000.
LM134 Series
6
Lead Resistance
The sense voltage which determines the operating current
of the LM134 is less than 100mV. At this level, thermo-
couple or lead resistance effects should be minimized by
locating the current setting resistor physically close to the
device. Sockets should be avoided if possible. It takes only
0.7Ω contact resistance to reduce output current by 1% at
the 1mA level.
Start-Up Time
The LM134 is designed to operate at currents as low as
1µA. This requires that internal biasing current be well
below that level because the device achieves its wide
operating current range by using part of the operating
current as bias current for the internal circuitry. To ensure
start-up, however, a fixed trickle current must be provided
internally. This is typically in the range of 20nA to 200nA
and is provided by the special ultralow I
DDS
FETs shown in
the Schematic Diagrams as Q7 and Q8. The start-up time
of the LM134 is determined by the I
DSS
of these FETs and
the capacitor C1. This capacitor must charge to approxi-
mately 500mV before Q3 turns on to start normal circuit
operation. This takes as long as (500mV)(50pF)/(20nA) =
1.25ms for very low I
DSS
values.
Using the LM134 as a Temperature Sensor
Because it has a highly linear output characteristic, the
LM134 makes a good temperature sensor. It is particularly
useful in remote sensing applications because it is a
current output device and is therefore not affected by long
wire runs. It is easy to calibrate, has good long term
stability and can be interfaced directly with most data
acquisition systems, eliminating the expensive preampli-
fiers required for thermocouples and platinum sensors.
A typical temperature sensor application is shown in
Figure␣ 2. The LM134 operating current at 25°C is set at
298µA by the 226Ω resistor, giving an output of 1µA/°K.
The current flows through the twisted pair sensor leads to
the 10k termination resistor, which converts the current
output to a voltage of 10mV/°K referred to ground. The
voltage across the 10k resistor will be 2.98V at 25°C, with
a slope of 10mV/°C. The simplest way to convert this
signal to a Centigrade scale is to subtract a constant 2.73V
in software. Alternately, a hardware conversion can be
used, as shown in Figure 3, using an LT1009 as a level
shifter to offset the output to a Centigrade scale.
The resistor (R
SET
) used to set the operating current of the
LM134 in temperature sensing applications should have
low temperature coefficient and good long term stability.
A 30ppm/°C drift in the resistor will change the slope of the
temperature sensor by 1%, assuming that the resistor is
at the same temperature as the sensor, which is usually the
case since the resistor should be located physically close
to the LM134 to prevent errors due to wire resistance. A
long term shift of 0.3% in the resistor will create a 1°C
temperature error. The long term drift of the LM134 is
typically much better than this, so stable resistors must be
used for best long term performance.
Calibration of the LM134 as a temperature sensor is
extremely easy. Referring to Figure 2, calibration is achieved
by trimming the termination resistor.
This theoretically
trims both zero and slope simultaneously for Centigrade
and Fahrenheit applications.
The initial errors in the LM134
are directly proportional to absolute temperature, just like
the actual output. This allows the sensor to be trimmed at
any temperature and have the slope error be corrected at
the same time. Residual slope error is typically less than
1% after this single trim is completed.
Figure 2 Kelvin Temperature Sensor
TO DATA
ACQUISITION
SYSTEM
10mV/°K9.53k
1k
CALIBRATE
134 F02
V
+
V
–
R
LM234-3
R
SET
226Ω
I = 1µA/°K
V
S
≥ 5V
APPLICATIO S I FOR ATIO
WUUU
LM134 Series
7
Figure 3. Centigrade Temperature Sensor
V
+
V
–
R
R
SET
226Ω
V
S
≥ 4V
LM134-3
134 F03
OUTPUT
10mV/°C9.53k
1%
1k
SLOPE
ADJ
10k
ZERO
ADJ
100Ω
10k
“a”
–15V
LT1009
The two trims shown in Figure 3 are still intended to be a
“one point” temperature calibration, where the zero and
the slope are trimmed at a single temperature. The LT1009
reference is adjusted to give 2.700V at node “a” at T
SENSOR
= 25°C. The 1k trimmer then adjusts the output for 0.25V,
completing the calibration. If the calibration is to be done
at a temperature other than 25°C , trim the LT1009 for
2.7025—(1µA)[T
SENSOR
(°C)](100Ω) at node “a”, then
adjust the 1k trimmer for proper output.
If higher accuracy is required, a two point calibration
technique can be used. In Figure 4, separate zero and slope
trims are provided. Residual nonlinearity is now the limi-
tation on accuracy. Nonlinearity of the LM134 in a 100°C
span is typically less than 0.5°C. This particular method of
trimming has the advantage that the slope trim does not
interact with the zero trim. Trim procedure is to adjust for
zero output with T
SENSOR
= 0°C, then trim slope for proper
output at some convenient second temperature. No fur-
ther trimming is required.
226Ω*
V
+
≥ 5V
V
+
V
–
R
LM134-3
134 F04
OUTPUT
10mV/°C
332k
1% 11k*
1%
SLOPE
TRIM
500k
ZERO
TRIM
10k
15k
50k
–15V
LT1009
*LOW TC, STABLE RESISTOR
Figure 4. Centigrade Temperature Sensor with 2 Point Trim
APPLICATIO S I FOR ATIO
WUUU
TYPICAL APPLICATIO S
U
V
+
V
–
R
LM334
V
IN
≥ 4.8V
R1
230Ω
1%
R2
10k
1%
C1
0.1µF
R3*
600ΩV
OUT
= 10mV/°K
Z
OUT
≤ 100Ω
134 TA03
*OUTPUT IMPEDANCE OF THE LM134 AT THE “R” PIN IS
APPROXIMATELY Ω, WHERE R
O
IS THE EQUIVALENT
EXTERNAL RESISTANCE CONNECTED TO THE V
–
PIN. THIS
NEGATIVE RESISTANCE CAN BE REDUCED BY A FACTOR OF
5 OR MORE BY INSERTING AN EQUIVALENT RESISTOR IN
SERIES WITH THE OUTPUT.
–R
O
16
134 TA04
V
+
V
–
R
LM334
V
IN
–V
IN
R
SET
I
+
R1*
≈10 R
SET
D1
1N457
*SELECT RATIO OF R1 TO R
SET
TO
OBTAIN ZERO DRIFT. I
+
≈2 I
SET
.
V
–
V
+
R
LM334 R
SET
I
SET
134 TA02
V
IN
–V
IN
Basic 2-Terminal
Current Source
Low Output Impedance
Thermometer (Kelvin Output)
Zero Temperature
Coefficient Current Source
LM134 Series
8
TYPICAL APPLICATIO S
U
TA06
V
+
V
–
R
LM334
V
IN
R3
100Ω
R2
300Ω
R1
15k
R4
4.5k
2N4250
V
OUT
= 10mV/°K
Z
OUT
≤ 2Ω
C1
0.0022
TA07
V
+
V
–
R
LM334
V
IN
≥ V
REF
+ 200mV
R2
120Ω
R1
1.5k
Q1
2N4250
V
OUT
= V
Z
+ 64mV AT 25°C
I
OUT
≤ 3mA
C1
0.1
LT1009
V
Z
+
–
TA05
V+
V–
R
LM334
VIN
–VIN
RSET
R1*
C1*
*SELECT R1 AND C1 FOR OPTIMUM STABILITY
2N2905
TA08
V
+
V
–
R
LM334
V
IN
–V
IN
R
SET
68k
1µA
LM4250
V
+
V
–
R
LM134**
C1
0.001
100k
V
IN
≥ 1.8V
V
OUT
= 1.2V
I
OUT
≤ 200µA
2N4250
R1
33k
1N457**
R1*
≈6k
1%
R2*
680Ω
1%
SELECT RATIO OF R1 TO R2 FOR ZERO TEMPERATURE DRIFT
LM134 AND DIODE SHOULD BE ISOTHERMAL
*
**
TA09
TA10
V
+
V
–
R
LM334
V
IN
V
OUT
R
SET
V
Z
Higher Output Current Low Output Impedance Thermometer Low Input Voltage Reference Driver
Micropower Bias 1.2V Regulator with 1.8V Minimum Input Zener Biasing
Alternate Trimming Technique Buffer for Photoconductive Cell High Precision Low TC Current Source
V–
V+
R
R1*
LM334 RSET
TA11
VIN
–VIN
*FOR ±10% ADJUSTMENT, SELECT RSET
10% HIGH AND MAKE R1 ≈ 3RSET
V
–
V
+
R
LM334
TA12
1.5V
1.37V
R2
TA13
V
+
V
–
R
LM334
R2*
R1
6.8k
I
SET
≥ 50µA
+
–
LT1004-1.2
(1.235V)
*I
SET
= + 10µA
I
SET
TC = 0.016%/°C + 33nA/°C
REGULATION ≈ 0.001%/V
LM134 Series
9
TYPICAL APPLICATIO S
U
Precision 10nA Current Source Micropower 5V Reference
FET Cascoding for Low Capacitance
and/or Ultrahigh Output Impedance
W
SCHE ATIC DIAGRA
W
Q7 Q8
Q5Q4 Q6
Q1
Q2
Q3
V
+
V
–
R
C1
50pF
134 SD
–
+
I
O
V
+
V
–
R
R1
2.7k
R2
226k
R3
1M
R4
100MΩ
LM134
2
3
4
7
6
8
LT1004-1.2
15V
–15V
15V
LT1008 BUFFERED
VOLTAGE
OUTPUT
200pF
I
O
= 10nA
Z
O
≥ 10
12
Ω
COMPLIANCE = –14V TO 12.5V
TA14
R
LM334
TA15
–
+
2
3
4
7
6
8
LM4250
22M
LT1004-1.2
(1.235V)
5.6k
1M
1%
3.01M
1%
150pF
V
IN
= 6.5V TO 15V
V
OUT
= 5V
V
–
V
+
R
LM334
R
SET
I
SET
I
SET
V
IN
–V
IN
Q1*
V
–
V
+
R
LM334
R
SET
TA16
V
IN
–V
IN
Q2*
*SELECT Q1 OR Q2 TO ENSURE AT LEAST 1V
ACROSS THE LM134. V
P
(1 – I
SET
/I
DSS
) ≥ 1.2V.
LM134 Series
10
0.016 – 0.021**
(0.406 – 0.533)
DIA
0.025
(0.635)
MAX
0.085 – 0.105
(2.159 – 2.667)
0.500
(12.700)
MIN
0.178 – 0.195
(4.521 – 4.953)
0.209 – 0.219
(5.309 – 5.537)
0.100
(2.540)
TYP
45°
H02/03(TO-46) 1098
0.050
(1.270)
TYP
0.050
(1.270)
TYP
0.028 – 0.048
(0.711 – 1.219)
0.036 – 0.046
(0.914 – 1.168)
FOR 3-LEAD PACKAGE ONLY
REFERENCE
PLANE *
LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE
AND 0.045" BELOW THE REFERENCE PLANE
FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS 0.016 – 0.024
(0.406 – 0.610)
*
**
PIN 1
0.050
(1.27)
BSC
0.060 ± 0.005
(1.524± 0.127)
DIA
0.90
(2.286)
NOM
0.180 ± 0.005
(4.572 ± 0.127)
0.180 ± 0.005
(4.572 ± 0.127)
0.500
(12.70)
MIN
0.050
(1.270)
MAX
UNCONTROLLED
LEAD DIMENSION
0.016 ± 0.003
(0.406 ± 0.076)
5°
NOM
0.015 ± 0.002
(0.381 ± 0.051)
0.060 ± 0.010
(1.524 ± 0.254)
10° NOM
0.140 ± 0.010
(3.556 ± 0.127)
Z3 (TO-92) 0401
0.098 +016/–0.04
(2.5 +0.4/–0.1)
2 PLCS
TO-92 TAPE AND REEL
REFER TO TAPE AND REEL SECTION OF
LTC DATA BOOK FOR ADDITIONAL INFORMATION
PACKAGE DESCRIPTIO
U
Z Package
3-Lead Plastic TO-92 (Similar to TO-226)
(Reference LTC DWG # 05-08-1410)
H Package
2-Lead and 3-Lead TO-46 Metal Can
(Reference LTC DWG # 05-08-1340)
OBSOLETE PACKAGE
LM134 Series
11
PACKAGE DESCRIPTIO
U
0.016 – 0.050
(0.406 – 1.270)
0.010 – 0.020
(0.254 – 0.508)× 45°
0°– 8° TYP
0.008 – 0.010
(0.203 – 0.254)
SO8 1298
0.053 – 0.069
(1.346 – 1.752)
0.014 – 0.019
(0.355 – 0.483)
TYP
0.004 – 0.010
(0.101 – 0.254)
0.050
(1.270)
BSC
1234
0.150 – 0.157**
(3.810 – 3.988)
8765
0.189 – 0.197*
(4.801 – 5.004)
0.228 – 0.244
(5.791 – 6.197)
DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
*
**
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
LM134 Series
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
LINEAR TECHNOLOGY CORPORATION 1991
134sc LT/CP 1001 1.5K REV C • PRINTED IN USA
TYPICAL APPLICATIO S
U
In-Line Current Limiter Generating Negative Output Impedance
Ground Referred Fahrenheit Thermometer
V
–
V
+
R
R
SET
LM334
TA17
V
IN
OP AMP
C1*
*USE MINIMUM VALUE REQUIRED TO
ENSURE STABILITY OF PROTECTED
DEVICE. THIS MINIMIZES INRUSH
CURRENT TO A DIRECT SHORT.
V–
V+
R
LM334 RSET
R1*
TA18
VIN
–VIN
*ZOUT ≈ –16 • R1(R1/VIN MUST NOT EXCEED ISET).
V–
V+
R
LM334 R2
100Ω
1%
R1
8.25k
1%
R4
56k
R5**
R3*
TA19
VIN
VOUT = 10mV/°F
10°F ≤ T ≤ 250°F
C1
0.01
2N4250
VIN ≥ 3V
LT1009
2.5V*
*SELECT R3 = VREF/583µA
**SELECT FOR 1.2mA
