June 1999
LM136-5.0/LM236-5.0/LM336-5.0
5.0V Reference Diode
General Description
The LM136-5.0/LM236-5.0/LM336-5.0 integrated circuits are precision 5.0V shunt regulator diodes. These monolithic IC voltage references operate as a low temperature coefficient 5.0V zener with 0.6Ω dynamic impedance. A third terminal on the LM136-5.0 allows the reference voltage and temperature coefficient to be trimmed easily.
The LM136-5.0 series is useful as a precision 5.0V low voltage reference for digital voltmeters, power supplies or op amp circuitry. The 5.0V makes it convenient to obtain a stable reference from low voltage supplies. Further, since the LM136-5.0 operates as a shunt regulator, it can be used as either a positive or negative voltage reference.
The LM136-5.0 is rated for operation over −55ÊC to +125ÊC while the LM236-5.0 is rated over a −25ÊC to +85ÊC temperature range. The LM336-5.0 is rated for operation over a
0ÊC to +70ÊC temperature range. See the connection diagrams for available packages. For applications requiring 2.5V see LM136-2.5.
Features
nAdjustable 4V to 6V
nLow temperature coefficient
nWide operating current of 600 µA to 10 mA
n0.6Ω dynamic impedance
n± 1% initial tolerance available
nGuaranteed temperature stability
nEasily trimmed for minimum temperature drift
nFast turn-on
nThree lead transistor package
Connection Diagrams
TO-92
Plastic Package
DS005716-4
Bottom View
Order Number LM236AZ-5.0, LM336Z-5.0 or LM336BZ-5.0
See NS Package Number Z03A
TO-46
Metal Can Package
DS005716-5
Bottom View
Order Number LM136H-5.0,
LM136H-5.0/883, LM236H-5.0,
LM136AH-5.0, LM136AH-5.0/883,
or LM236AH-5.0
See NS Package Number H03H
Diode Reference 0V.5 0.5-0/LM336.5-0/LM236.5-LM136
© 1999 National Semiconductor Corporation |
DS005716 |
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Connection Diagrams (Continued)
SO Package
DS005716-7
Order Number LM336M-5.0 or LM336BM-5.0
See NS Package Number M08A
Typical Applications
5.0V Reference |
5.0V Reference with Minimum |
Trimmed 4V to 6V Reference |
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Temperature Coefficient |
with Temperature Coefficient |
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Independent of Breakdown Voltage |
DS005716-1
DS005716-3
* Does not affect temperature coefficient
DS005716-15
²Adjust to 5.00V
*Any silicon signal diode
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Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.
Reverse Current |
15mA |
Forward Current |
10mA |
Storage Temperature |
−60ÊC to +150ÊC |
Operating Temperature Range (Note 2) |
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LM136-5.0 |
−55ÊC to +150ÊC |
LM236-5.0 |
−25ÊC to +85ÊC |
LM336-5.0 |
0ÊC to +70ÊC |
Soldering Information |
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TO-92 Package (10 sec.) |
260ÊC |
TO-46 Package (10 sec.) |
300ÊC |
SO Package |
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Vapor Phase (60 sec.) |
215ÊC |
Infrared (15 sec.) |
220ÊC |
See AN-450 ªSurface Mounting Methods and Their Effect on Product Reliabilityº (appendix D) for other methods of soldering surface mount devices.
Electrical Characteristics
(Note 3)
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LM136A-5.0/LM236A-5.0 |
LM336B-5.0 |
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Parameter |
Conditions |
LM136-5.0/LM236-5.0 |
LM336-5.0 |
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Units |
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Min |
Typ |
Max |
Min |
Typ |
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Max |
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Reverse Breakdown Voltage |
TA=25ÊC, IR=1 mA |
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LM136-5.0/LM236-5.0/LM336-5.0 |
4.9 |
5.00 |
5.1 |
4.8 |
5.00 |
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5.2 |
V |
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LM136A-5.0/LM236A-5.0, LM336B-5.0 |
4.95 |
5.00 |
5.05 |
4.90 |
5.00 |
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5.1 |
V |
Reverse Breakdown Change |
TA=25ÊC, |
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6 |
12 |
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6 |
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20 |
mV |
With Current |
600 µA≤IR≤10 mA |
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Reverse Dynamic Impedance |
TA=25ÊC, IR=1 mA, f = 100 Hz |
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0.6 |
1.2 |
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0.6 |
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2 |
Ω |
Temperature Stability |
VR Adjusted 5.00V |
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(Note 4) |
IR=1 mA, (Figure 2) |
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0ÊC≤TA≤70ÊC (LM336-5.0) |
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4 |
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12 |
mV |
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−25ÊC ≤TA≤+85ÊC (LM236-5.0) |
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7 |
18 |
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mV |
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−55ÊC ≤TA≤+125ÊC (LM136-5.0) |
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20 |
36 |
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mV |
Reverse Breakdown Change |
600 µA≤IR≤10 mA |
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6 |
17 |
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6 |
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24 |
mV |
With Current |
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Adjustment Range |
Circuit of Figure 1 |
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±1 |
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±1 |
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V |
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Reverse Dynamic Impedance |
IR = 1 mA |
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0.8 |
1.6 |
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0.8 |
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2.5 |
Ω |
Long Term Stability |
TA=25ÊC±0.1ÊC, IR=1 mA, t = 1000 hrs |
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20 |
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20 |
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ppm |
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device beyond its specified operating conditions.
Note 2: For elevated temperature operation, Tj max is:
LM136 150ÊC
LM236 125ÊC
LM336 100ÊC
Thermal Resistance |
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TO-92 |
TO-46 |
SO-8 |
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θja (Junction to Ambient) |
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180ÊC/W (0.4" Leads) |
440ÊC/W |
165ÊC/W |
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170ÊC/W (0.125" |
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Leads) |
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θja (Junction to Case) |
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N/A |
80ÊC/W |
N/A |
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Note 3: Unless otherwise specified, |
the LM136-5.0 is specified |
from −55ÊC ≤TA≤+125ÊC, the LM236-5.0 from −25ÊC ≤TA≤+85ÊC and the LM336-5.0 from |
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0ÊC≤TA≤+70ÊC. |
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Note 4: Temperature stability for the LM336 and LM236 family is guaranteed by design. Design limits are guaranteed (but not 100% percent production tested) over the indicated temperature and supply voltage ranges. These limits are not used to calculate outgoing quality levels. Stability is defined as the maximum charge in VREF from 25ÊC to TA(min) or TA(max).
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Typical Performance Characteristics
Reverse Voltage Change |
Zener Noise Voltage |
Dynamic Impedance |
DS005716-17 DS005716-18 DS005716-19
Response Time Reverse Characteristics
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DS005716-20 |
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DS005716-21 |
Temperature Drift |
Forward Characteristics |
DS005716-22 |
DS005716-23 |
Application Hints
The LM136-5.0 series voltage references are much easier to use than ordinary zener diodes. Their low impedance and wide operating current range simplify biasing in almost any circuit. Further, either the breakdown voltage or the temperature coefficient can be adjusted to optimize circuit performance.
Figure 1 shows an LM136-5.0 with a 10k potentiometer for adjusting the reverse breakdown voltage. With the addition of R1 the breakdown voltage can be adjusted without affecting the temperature coefficient of the device. The adjustment range is usually sufficient to adjust for both the initial device tolerance and inaccuracies in buffer circuitry.
If minimum temperature coefficient is desired, four diodes can be added in series with the adjustment potentiometer as shown in Figure 2. When the device is adjusted to 5.00V the temperature coefficient is minimized. Almost any silicon signal diode can be used for this purpose such as a 1N914, 1N4148 or a 1N457. For proper temperature compensation the diodes should be in the same thermal environment as the LM136-5.0. It is usually sufficient to mount the diodes near the LM136-5.0 on the printed circuit board. The absolute resistance of the network is not critical and any value from 2k to 20k will work. Because of the wide adjustment range, fixed resistors should be connected in series with the pot to make pot setting less critical.
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