Texas Instruments TL331KDBVT

Overview

TL331KDBVT from Texas Instruments is a single, open-collector output voltage comparator in SOT-23-5 package, designed for cost-sensitive industrial and power systems. It operates from 2 V to 36 V supply, delivers ±4 mV max input offset voltage over temperature, 430 µA max quiescent current at 36 V, and 1.3 µs typical propagation delay - enabling precise threshold detection in server PSUs and motor drives.

For engineers reviewing the TL331KDBVT datasheet, TL331KDBVT pinout, TL331KDBVT application, or TL331KDBVT equivalent, key selection considerations include its ground-sensing input range, open-collector TTL/MOS/CMOS-compatible output, −40°C to +105°C operating junction temperature, and drop-in compatibility with legacy TL331K designs without layout changes.

Technical Context

The TL331KDBVT implements a PNP Darlington-pair input stage, enabling low input bias current (−25 nA max) and rail-to-rail common-mode input range down to ground while maintaining high gain and fast response. Its open-collector NPN output supports wired-AND logic and flexible pull-up voltage selection up to 36 V.

It supports dual-supply operation if supply difference stays within 2 V to 36 V and VCC remains ≥1.5 V above input common-mode voltage. Supply current remains stable across 2–36 V and is independent of supply voltage - critical for wide-input-range power monitoring circuits.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package, 2.90 mm × 1.60 mm body size, surface-mount, moisture-sensitive level 1 (MSL-1).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage comparator applications.

Compared with TL331KDBVT, TL331BDBVT offers tighter offset and wider temperature range but requires validation for +125°C thermal management, while LM393DR provides dual functionality in larger package at lower temperature grade - making TL331KDBVT optimal for space-constrained, high-temp single-comparator roles.

Availability

TL331KDBVT is available at Aetrix Electronics and suitable for server PSU monitoring, vacuum robot safety interlocks, and cordless power tool motor control requiring stable component supply across industrial temperature grades and long production lifecycles.

Supply support for TL331KDBVT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and consumer markets.

The TL331 family was engineered as a cost-optimized, single-channel voltage comparator for industrial power monitoring and safety-critical threshold detection - emphasizing wide supply range, ground-sensing capability, and open-collector flexibility.

FAQ

What is the maximum supply voltage rating for TL331KDBVT?

The TL331KDBVT has an absolute maximum supply voltage (V_CC) of 36 V, as specified in Section 5.1 of the datasheet. This rating applies across the full −40°C to +105°C operating junction temperature range and enables direct integration into 24 V industrial systems and 36 V battery-powered equipment without external regulation. Exceeding 36 V risks permanent device damage.

Does TL331KDBVT support ground-referenced input signals?

Yes, TL331KDBVT supports ground-referenced input signals: its common-mode input voltage range extends down to 0 V, as confirmed in Section 5.10 and Section 6.1. This allows direct connection of IN+ or IN− to ground or low-side shunt resistors - essential for current sensing and battery monitoring applications where reference integrity at 0 V is required.

What is the typical propagation delay of TL331KDBVT and how does it vary with supply voltage?

TL331KDBVT exhibits a typical propagation delay of 1.3 µs at 5 V supply (Section 5.11), with minimal variation across 2–36 V - confirmed by Figure 5-25 through 5-30 showing consistent 1.0–1.4 µs delay across 5 V, 12 V, and 36 V conditions. This stability ensures predictable timing in multi-rail power systems without recalibration.

Can TL331KDBVT replace older TL331I or TL331 versions on existing PCBs?

Yes, TL331KDBVT is a direct drop-in replacement for TL331I and TL331K variants per Section 3 and Section 6.1 of the datasheet. It shares identical SOT-23-5 (DBV) package, pinout, and electrical specifications - including −40°C to +105°C temperature grade, 36 V max supply, and 1.3 µs response - requiring no PCB or schematic modifications.

What output configuration does TL331KDBVT use and what pull-up voltage is supported?

TL331KDBVT uses an open-collector NPN output (Section 4 and Section 6.3), requiring an external pull-up resistor. The output can safely interface with pull-up voltages up to 36 V, matching its V_CC rating - enabling logic-level translation between 3.3 V MCU GPIOs and 24 V control buses without additional level-shifters or buffers.