Texas Instruments TLV431BIDBVT

Overview

TLV431BIDBVT from Texas Instruments is a low-voltage adjustable precision shunt regulator with 0.5% initial reference voltage tolerance (1.24 V at 25°C), 0.25 Ω typical dynamic impedance, and operation down to 1.24 V cathode-anode voltage. It delivers stable voltage referencing in isolated flyback SMPS secondary-side regulation, Zener replacement, and comparator applications requiring tight accuracy and low headroom.

For engineers reviewing the TLV431BIDBVT datasheet, TLV431BIDBVT pinout, TLV431BIDBVT application, or TLV431BIDBVT equivalent, key selection criteria include its ±0.5% VREF tolerance at 25°C, ultra-small SC-70 (DCK) package footprint, 55–100 µA minimum cathode current requirement, 0.25 Ω dynamic impedance, and compatibility with optocoupler-based feedback loops in 3.3 V and lower-output isolated power supplies.

Technical Context

The TLV431BIDBVT implements a bandgap-referenced error amplifier with Darlington output stage, enabling precise shunt regulation via external resistor divider feedback between cathode and reference pins. Its internal architecture supports both open-loop comparator mode (with integrated 1.24 V reference) and closed-loop shunt regulation mode without requiring external compensation.

It operates across –40°C to 125°C (Q-grade), maintains 4 mV VREF drift over 0°C to 70°C, and achieves stable regulation with as little as 55 µA cathode current - significantly lower than legacy TL431 - making it suitable for low-power and battery-backed systems where quiescent current matters.

Key Specifications

Pinout & Package

TLV431BIDBVT is packaged in the ultra-small SC-70 (DCK) 6-pin surface-mount package (2.0 mm × 1.5 mm). Pin 1 is CATHODE, Pin 3 is REFERENCE, Pin 6 is ANODE; Pins 2, 4, and 5 are NC (no internal connection).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar shunt regulator applications.

Compared with TLV431BIDBVR, the TLV431BIDBVT offers identical performance in a convenient cut-tape format for engineering validation; versus TLVH431IDBVR, it trades higher voltage/current capability for superior low-voltage accuracy and smaller SC-70 footprint - making TLV431BIDBVT optimal for space- and power-constrained 3.3 V systems.

Availability

TLV431BIDBVT is available at Aetrix Electronics and suitable for isolated flyback SMPS design, precision voltage monitoring, and low-power comparator applications requiring stable component supply, consistent parametric performance, and long-term manufacturability.

Supply support for TLV431BIDBVT 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 company specializing in analog and embedded processing technologies, with decades of leadership in precision references and power management ICs.

The TLV431BIDBVT belongs to TI's TLV431x low-voltage shunt regulator family, designed specifically for high-accuracy, low-headroom voltage referencing in space-constrained and energy-efficient power systems - including isolated DC/DC converters, battery monitors, and sensor interface circuits.

FAQ

What is the reference voltage tolerance of TLV431BIDBVT at 25°C?

The TLV431BIDBVT has a reference voltage tolerance of ±0.5% at 25°C, meaning its VREF is guaranteed between 1.234 V and 1.246 V under nominal conditions. This tighter tolerance than TLV431A (±1%) or TLV431 (±1.5%) makes TLV431BIDBVT suitable for applications demanding higher initial accuracy without calibration.

Can TLV431BIDBVT replace a standard Zener diode in a 1.8 V regulation circuit?

Yes, TLV431BIDBVT can directly replace a Zener diode in 1.8 V circuits because its minimum operating voltage is 1.24 V - well below 1.8 V - and it provides far superior temperature stability (4 mV drift over 0°C–70°C vs typical Zener drift >10 mV/°C) and tighter initial tolerance (±0.5% vs ±5–10%).

What is the minimum cathode current required for TLV431BIDBVT to regulate properly?

The TLV431BIDBVT requires a minimum cathode current of 55 µA (typical) to enter regulation, with a maximum of 100 µA across its full temperature range (–40°C to 125°C). This ultra-low IK(min) enables reliable operation in micropower applications where traditional TL431 (1 mA min) would fail.

Which package type does TLV431BIDBVT use, and what are its dimensions?

TLV431BIDBVT uses the SC-70 (DCK) package, measuring 2.0 mm × 1.5 mm - 40% smaller than the SOT-23-3 footprint. This ultra-compact size supports high-density PCB layouts in wearables, IoT edge nodes, and miniaturized power modules where board space is at a premium.

How does TLV431BIDBVT behave when used as a comparator?

When used open-loop as a comparator, TLV431BIDBVT compares voltage at its REF pin to its internal 1.24 V reference and pulls its CATHODE pin low when REF exceeds VREF. Its high open-loop gain ensures fast response, and its integrated reference eliminates the need for external precision voltage sources - simplifying brown-out detection and threshold-sensing circuits.