TL331B and TL391B Single Comparators - TL331B/TL391B datasheet

Oct 12, 2026

TL331B and TL391B are next-generation single comparators based on the TL331, designed for cost-sensitive applications with improved electrical performance. Key benefits include lower input offset voltage and bias current, reduced supply current, faster 1 µs response time, wider temperature range, and improved 2 kV HBM ESD robustness. TL331B provides a drop-in improved replacement for TL331I and TL331K variants, while TL391B offers an alternate pinout to replace competitive devices.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages27

Reading Time1 h 8 min

AccessFree to download

1 Features

2 Applications

3 Description

4 Pin Configuration and Functions

5 Specifications

5.1 Absolute Maximum Ratings, TL331 and TL331K

5.2 Absolute Maximum Ratings, TL331B and TL391B

5.3 ESD Ratings-TL331B and TL391B

5.4 ESD Ratings, TL331 and TL331K

5.5 Recommended Operating Conditions, TL331B and TL391B

5.6 Recommended Operating Conditions, TL331 and TL331K

5.7 Thermal Information

5.8 Electrical Characteristics, TL331B and TL391B

5.9 Switching Characteristics, TL331B and TL391B

5.10 Electrical Characteristics, TL331 and TL331K

5.11 Switching Characteristics, TL331 and TL331K

5.12 Typical Characteristics

6 Detailed Description

6.1 Overview

6.2 Functional Block Diagram

6.3 Feature Description

6.4 Device Functional Modes

7 Application and Implementation

7.1 Application Information

7.2 Typical Application

8 Device and Documentation Support

8.1 Documentation Support

8.2 Receiving Notification of Documentation Updates

8.3 Support Resources

8.4 Trademarks

8.5 Electrostatic Discharge Caution

8.6 Glossary

9 Revision History

10 Mechanical, Packaging, and Orderable Information

TL331, TL331B, TL391B SLVS238L – AUGUST 1999 – REVISED NOVEMBER 2024 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 maximumrated 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 atthe 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 | 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. Table of Contents 1 Features............................................................................ 1 2 Applications..................................................................... 1 3 Description....................................................................... 1 4 Pin Configuration and Functions...................................3 Pin Functions.................................................................... 3 5 Specifications.................................................................. 4 5.1 Absolute Maximum Ratings, TL331 and TL331K....... 4 5.2 Absolute Maximum Ratings, TL331B and TL391B..... 4 5.3 ESD Ratings-TL331B and TL391B........................... 5 5.4 ESD Ratings, TL331 and TL331K...............................5 5.5 Recommended Operating Conditions, TL331Band TL391B...................................................................5 5.6 Recommended Operating Conditions, TL331

FAQs

What differentiates TL331B and TL391B from the TL331 comparator family?

TL331B and TL391B are next-generation versions with improved specifications, including lower offset voltage and bias current, lower supply current, faster response time, wider temperature range, and improved 2 kV HBM ESD performance.

How do supply voltages affect operation and output behavior?

Dual-supply operation is possible when the difference between the two supplies is within 2 V to 36 V and VCC is at least 1.5 V more positive than the input common-mode voltage. Current drain is independent of supply voltage, and outputs can be used with other open-collector outputs for wired-AND relationships.

What are common application areas for these comparators?

Applications include vacuum robots, single-phase UPS, server power supplies, cordless power tools, wireless infrastructure, appliances, building automation, factory automation and control, motor drives, and infotainment/cluster systems.

Oct 12, 2026

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