TL331B, TL391B and TL331 Single Comparators

1 Features

• NEW TL331B and TL391B

• Improved specifications of B-version

– Maximum rating: up to 38V

– ESD rating (HBM): 2kV

– Improved reverse voltage performance

– Low input offset: 0.37mV

– Low input bias current: 3.5nA

– Low supply-current: 430µA

– Faster response time of 1µsec

– TL391B provides an alternate pinout

• TL331B is improved drop-in replacement for

TL331

• Common-mode input voltage range includes

ground

• Differential input voltage range equal to maximum-

rated supply voltage: ±38V

• Low output saturation voltage

• Output compatible with TTL, MOS, and CMOS

2 Applications

• Vacuum robot

• Single phase UPS

• Server PSU

• Cordless power tool

• Wireless infrastructure

• Appliances

• Building automation

• Factory automation & control

• Motor drives

• Infotainment & cluster

3 Description

The TL331B and TL391B devices are the next

generation versions of the industry-standard TL331

comparator. These next generation devices provide

outstanding value for cost-sensitive applications,

with features including lower offset voltage, higher

supply voltage capability, lower supply current,

lower input bias current, lower propagation delay,

wider temperature range and improved 2kV ESD

performance with drop-in replacement convenience.

The TL331B is a drop-in improved replacement for

both the TL331I and TL331K versions, while the

TL391B provides an alternate pinout of the TL331B

to replace competitive devices.

Operation from dual supplies also is possible as long

as the difference between the two supplies is within

2V to 36V, and VCC is at least 1.5V more positive

than the input common-mode voltage. Current drain

is independent of the supply voltage. The outputs

can be connected to other open-collector outputs to

achieve wired-AND relationships.

Device Information

PART NUMBER(1)

PACKAGE

BODY SIZE (NOM)

(2)

TL331,

TL331B,

TL391B

SOT-23 (5)

2.90mm × 1.60mm

(1)

For all available packages, see the orderable addendum at

the end of the data sheet.

(2)

The package size (length × width) is a nominal value and

includes pins, where applicable.

Family Comparison Table

Specification

TL331B

TL391B

TL331I

TL331K

Units

Supply Voltage

2 to 36

2 to 36

2 to 36

V

Total Supply Current (5V to 36V maximum)

0.43

0.7

0.7

mA

Temperature Range

−40 to 125

-40 to 85

-40 to 105

°C

ESD (HBM)

2000

1000

1000

V

Offset Voltage (maximum over temp)

± 4

± 9

± 9

mV

Input Bias Current (typical / maximum)

3.5 / 25

25 / 250

25 / 250

nA

Response Time (typical)

1

1.3

1.3

µsec

TL331, TL331B, TL391B

SLVS238L – AUGUST 1999 – REVISED NOVEMBER 2024

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.