Absolute Maximum Ratings

(Notes 1, 2)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Supply Voltage, V

S

40V

Output Short Circuit to Ground

Continuous

Output Short Circuit to V

CC

Continuous

Input Voltage

−0.2V to +V

S

Package Dissipation at 25˚C

1.25W (Note 3)

Lead Temperature (Soldering, 10 sec.)

Dual-In-Line Package (Plastic)

260˚C

ESD Susceptibility (Note 5)

500V

Operating Ratings (Note 2)

Operating Ambient Temperature

LM231, LM231A

−25˚C to +85˚C

LM331, LM331A

0˚C to +70˚C

Supply Voltage, V

S

+4V to +40V

Package Thermal Resistance

Package

θ

J-A

8-Lead Plastic DIP

100˚C/W

Electrical Characteristics

All specifications apply in the circuit of Figure 4, with 4.0V

≤ V

S

≤ 40V, T

A=25˚C, unless otherwise specified.

Parameter

Conditions

Min

Typ

Max

Units

VFC Non-Linearity (Note 4)

4.5V

≤ V

S

≤ 20V

±0.003

±0.01

% Full- Scale

T

MIN

≤ T

A

≤ T

MAX

±0.006

±0.02

% Full- Scale

VFC Non-Linearity in Circuit of Figure 3

V

S =15V,f=10Hzto11kHz

±0.024

±0.14

%Full- Scale

Conversion Accuracy Scale Factor (Gain)

LM231, LM231A

V

IN = −10V, RS =14k

Ω

0.95

1.00

1.05

kHz/V

LM331, LM331A

0.90

1.00

1.10

kHz/V

Temperature Stability of Gain

LM231/LM331

T

MIN

≤ T

A

≤ T

MAX, 4.5V

≤ V

S

≤ 20V

±30

±150

ppm/˚C

LM231A/LM331A

±20

±50

ppm/˚C

Change of Gain with V

S

4.5V

≤ V

S

≤ 10V

0.01

0.1

%/V

10V

≤ V

S

≤ 40V

0.006

0.06

%/V

Rated Full-Scale Frequency

V

IN = −10V

10.0

kHz

Gain Stability vs. Time (1000 Hours)

T

MIN

≤ T

A

≤ T

MAX

±0.02

% Full- Scale

Over Range (Beyond Full-Scale)

Frequency

V

IN = −11V

10

%

INPUT COMPARATOR

Offset Voltage

±3

±10

mV

LM231/LM331

T

MIN

≤ T

A

≤ T

MAX

±4

±14

mV

LM231A/LM331A

T

MIN

≤ T

A

≤ T

MAX

±3

±10

mV

Bias Current

−80

−300

nA

Offset Current

±8

±100

nA

Common-Mode Range

T

MIN

≤ T

A

≤ T

MAX

−0.2

V

CC−2.0

V

TIMER

Timer Threshold Voltage, Pin 5

0.63

0.667

0.70

x V

S

Input Bias Current, Pin 5

V

S = 15V

All Devices

0V

≤ V

PIN 5

≤ 9.9V

±10

±100

nA

LM231/LM331

V

PIN 5 = 10V

200

1000

nA

LM231A/LM331A

V

PIN 5 = 10V

200

500

nA

V

SAT PIN 5 (Reset)

I=5mA

0.22

0.5

V

CURRENT SOURCE (Pin 1)

Output Current

LM231, LM231A

R

S =14k

Ω,V

PIN 1 = 0

126

135

144

µA

LM331, LM331A

116

136

156

µA

Change with Voltage

0V

≤ V

PIN 1

≤ 10V

0.2

1.0

µA

Current Source OFF Leakage