Features
● Low temperature coefficient
● Wide operating current of 400µA to 10mA
● 0.2Ω dynamic impedance
● Guaranteed temperature stability
● Fast turn-on
Description
The LM236 and LM336 are precision 2.5V
regulator diodes. These voltage reference
monolithic ICs operate like 2.5V Zener diodes
with a low temperature coefficient and a dynamic
impedance of 0.2Ω. A third pin enables adjusting
the reference voltage and the temperature
coefficient.
LM236-LM336
2.5V voltage references
TO92
(Plastic package)
SO8
(Plastic micropackage)
Pin connections
TO92
(Bottom view)
v+
v-
ADJ
SO8
(Top view )
V+ NC
8765
NC
ADJ
1- NC
2- NC
3- NC
4- V5- ADJ
6- NC
1234
NC
NC
NC
7- NC
V+
8- V+
May 2007 Rev 3 1/15
www.st.com
15
Schematic diagram LM236-LM336
1 Schematic diagram
Figure 1. Schematic diagram
2 Absolute maximum ratings
Table 1. Absolute maximum ratings (AMR)
Symbol Parameter LM236 LM336,B Unit
Current
I
R
I
F
T
oper
T
stg
2/15
Reverse
Forward
Operating free-air temperature range -25 to +85 0 to +70 °C
Storage temperature range -65 to +150 °C
15
10
mA
LM236-LM336 Electrical characteristics
3 Electrical characteristics
Table 2. Electrical characteristics
LM236 LM336,B
Symbol Parameter
Min. Typ. Max. Min. Typ. Max.
Reference breakdown voltage
= +25°C, IR = 1mA
T
V
amb
R
LM236, LM336
LM336B
2.44 2.49 2.54 2.39
2.44
Reverse breakdown voltage change with current
ΔV
400µA ≤ IR ≤ 10mA
R
T
amb
T
≤ T
min
= +25°C
amb
≤ T
max
2.6
3
6
10
Reverse dynamic impedance (IR = 1mA)
Z
D
K
VT
K
VH
T
T
amb
min
= +25°C
≤ T
amb
≤ T
max
0.2
0.4
0.6
1
Temperature sta b ili ty (VR = 2.49V, IR = 1mA) 3.5 9 1.8 6 mV
Long term stability (T
= +25°C ±0.1°C, IR= 1mA) 20 20 ppm
amb
Figure 2. Reverse voltage change Figure 3. Zener noise voltage
Unit
2.49
2.59
2.49
2.54
2.631012mV
0.2
0.411.4
V
Ω
Reverse voltage change (mV)
Reverse current (mA)
Noise (nV/√Hz)
Frequency (Hz)
3/15
Electrical characteristics LM236-LM336
Figure 4. Dynamic impedance Figure 5. Response time
Voltage swing (V)
Dynamic impedance (Ohm)
Frequency (Hz)
Time (µs)
Figure 6. Reverse characteristics Figure 7. Forward characteristics
Reverse current (mA)
Reverse voltage (V)
Figure 8. Temperature drift
Reverse voltage (V)
Temperatur e (°C)
Forward voltage (V)
Forward current (mA)
4/15
LM236-LM336 Application information
4 Application information
The LM236, LM336 voltage references are easier to use than zener diodes. Their low
impedance and wide current range facilitate biasing in any circuits . Besides , the breakdo wn
voltage or the temperature coefficient can be adjusted so as to optimize the performance of
the circuit.
Figure 9 represents a LM336 with a 10kΩ potentiometer to adjust the reverse breakdown
voltage which can be a djusted without altering the temper atur e coeff icient of the circu it. The
adjustment range is generally sufficient to adjust the initial tolerance of the circuit and the
inaccuracy of the amplifier circuit.
To obtain a lower temperature coefficient two diodes can be connected in series as
indicated in Figure 10.
When the circuit is adjusted to 2.49V the temperature coefficient is minimized.
For a correct temperature coefficient, the diodes should be at the same ambient
temperature as the LM336. The value of R1 is not critical (2-20kΩ).
Figure 9. LM336 with pot for adjustment of
Figure 10. Temperature coefficient adjustment
breakdown volta ge
5/15
Application information LM236-LM336
Typical applications
Figure 11. 2.5V reference Figure 12. Wide input range reference
Figure 13. Precision power regulator with low temperature coefficient
6/15
LM236-LM336 Application information
Figure 14. Adjustable shunt regulator
Figure 15. Linear ohmmeter
7/15
Application information LM236-LM336
Figure 16. Bipolar output reference
Figure 17. 5V buffered reference
8/15
LM236-LM336 Application information
Figure 18. Low nois e buffered reference
9/15
Package information LM236-LM336
5 Package information
In order to meet environmental requirements, STMicroelectronics offers these devices in
ECOPACK
category of second level interconnect is marke d on the pa ckage and on the inner box label,
in compliance with JEDEC Standard JESD97. The maximum ratings related t o soldering
conditions are also marked on the inner box label. ECOPACK is an STMicroelectronics
trademark. ECOPACK specifications are available at: www.st.com
®
packages. These packages have a lead-free second level interconnect. The
.
10/15
LM236-LM336 Package information
5.1 SO-8 package mechanical data
Dimensions
Ref.
Millimeters Inches
Min. Typ. Max. Min. Typ. Max.
A1.750.069
A1 0.10 0.25 0.004 0.010
A2 1.25 0.049
b 0.28 0.48 0.011 0.019
c 0.17 0.23 0.007 0.010
D 4.80 4.90 5.00 0.189 0.193 0.197
H 5.80 6.00 6.20 0.228 0.236 0.244
E1 3.80 3.90 4.00 0.150 0.154 0.157
e 1.27 0.050
h 0.25 0.50 0.010 0.020
L 0.40 1.27 0.016 0.050
k1°8°1°8°
ccc 0.10 0.004
11/15
Package information LM236-LM336
5.2 TO-92 ammopack and tape & reel package mechanical data
A1
P
d
P
A
T
H
H
H1
L1
D0
P2
I1
F1
F2
P0
W2
H0
W0
W1
W
Millimeters Inches
Dim.
Min. Typ. Max. Min. Typ. Max.
AL 5.0 0.197
A 5.0 0.197
T 4.0 0.157
d 0.45 0.018
I1 2.5 0.098
P 11.7 12.7 13.7 0.461 0.500 0.539
PO 12.4 12.7 13 0.488 0.500 0.512
P2 5.95 6.35 6.75 0.234 0.250 0.266
F1/F2 2.4 2.5 2.8 0.094 0.098 0.110
Δh -1 0 1 -0.039 0 0.039
ΔP -1 0 1 -0.039 0 0.039
W 17.5 18.0 19.0 0.689 0.709 0.748
W0 5.7 6 6.3 0.224 0.236 0.248
W1 8.5 9 9.75 0.335 0.354 0.384
W2 0.5 0.020
H200.787
H0 15.5 16 16.5 0.610 0.630 0.650
H1 25 0.984
DO 3.8 4.0 4.2 0.150 0.157 0.165
L1 11 0.433
12/15
LM236-LM336 Package information
5.3 TO-92 bulk package mechanical data
Millimeters Inches
Dim.
Min. Typ. Max. Min. Typ. Max.
L 1.27 0.05
B 3.2 3.7 4.2 0.126 0.1457 0.1654
O1 4.45 5.00 5.2 0.1752 0.1969 0.2047
C 4.58 5.03 5.33 0.1803 0.198 0.2098
K12.7 0.5
O2 0.407 0.5 0.508 0.016 0.0197 0.02
a 0.35 0.0138
13/15
Ordering information LM236-LM336
6 Ordering information
Table 3. Order codes
Part number
LM236D/DT -25°C to +85°C SO-8
LM236Z/ZT/AP -25°C to +85°C TO-92
LM336D/DT -25°C to +85°C SO-8
LM336Z/ZT/AP -25°C to +85°C TO-92
LM336BD/BDT 0°C to 70°C SO-8
LM336BZ/BZT/BAP 0°C to 70°C TO-92
Temperature
range
7 Revision history
Package Packing Marking
Tube or
Tape & reel
Bulk or
Tape & reel or
Ammopack
Tube or
Tape & reel
Bulk or
Tape & reel or
Ammopack
Tube or
Tape & reel
Bulk or
Tape & reel or
Ammopack
LM236
LM236
LM336
LM336
LM336B
LM336B
Date Revision Changes
2-May-1997 1 Initial release.
24-May-2003 2
29-May-2007 3
Caption of pinout diagram for TO-92 package changed to indicate top
view.
Corrected caption of pinout diagram for TO-92 package on cover
page (previous version is wrong, should be bottom view).
Updated Section 5: Package information and Table 3: Order codes.
14/15
LM236-LM336
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