Texas Instruments TLVH431BQDBVR

Overview

TLVH431BQDBVR from Texas Instruments is a low-voltage adjustable precision shunt regulator in SC-70 package, featuring 0.5% initial reference voltage tolerance (1.24 V at 25°C), 100 μA minimum cathode current for regulation, and operation across –40°C to +125°C. It serves as an ultra-low-leakage voltage reference or comparator with integrated reference in isolated flyback SMPS feedback loops and on-board rail monitoring circuits.

For engineers reviewing the TLVH431BQDBVR datasheet, TLVH431BQDBVR pinout, TLVH431BQDBVR application, or TLVH431BQDBVR equivalent, key selection criteria include its 1.24 V reference accuracy over temperature, 0.25 Ω dynamic impedance, SC-70 footprint compatibility, and suitability for secondary-side regulation in 3.3 V/5 V isolated power supplies.

Technical Context

The TLVH431BQDBVR implements a precision bandgap reference and high-gain transconductance amplifier in a 3-terminal shunt topology. Its internal Darlington output stage enables sharp turn-on behavior and stable regulation down to 1.24 V with cathode currents from 100 μA to 70 mA.

Unlike the TL431, it operates at lower headroom and exhibits <0.5 mV/V cathode voltage sensitivity and <0.5 μA reference input current - enabling high-accuracy closed-loop error amplification and open-loop voltage monitoring without external biasing.

Key Specifications

Pinout & Package

TLVH431BQDBVR uses the SC-70 (DCK) 6-pin package (2.00 mm × 1.25 mm), with Pin 1 = CATHODE, Pin 2 = ANODE, Pin 3 = REF, Pin 4 & Pin 5 = NC, Pin 6 = substrate connection (must connect to ANODE or leave open).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLVH431BQDBVR, TLVH431BIDBVR trades extended temperature support for lower cost, while TLVH431BQDBZ maintains identical performance but requires PCB redesign due to pinout and package size differences - making TLVH431BQDBVR optimal for new designs demanding minimal footprint and AEC-Q100-aligned thermal robustness.

Availability

TLVH431BQDBVR is available at Aetrix Electronics and suitable for isolated power supplies, precision voltage monitoring, and data converter reference applications requiring stable component supply across automotive, industrial, and medical electronics programs.

Supply support for TLVH431BQDBVR 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 with deep expertise in precision analog ICs and power management.

The TLVH431 family was designed specifically for low-voltage shunt regulation and error amplification in isolated DC-DC converters, battery-powered instrumentation, and space-constrained embedded systems - addressing limitations of legacy TL431 in sub-2.5 V domains.

FAQ

What is the reference voltage tolerance of TLVH431BQDBVR at 25°C?

The TLVH431BQDBVR has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 1.24 V nominal value with a range of 1.234 V to 1.246 V. This B-grade accuracy is specified in Section 5.7 of the TI datasheet and applies across all operating conditions at room temperature. The TLVH431BQDBVR maintains this tight tolerance while supporting full –40°C to +125°C operation.

Which package type does TLVH431BQDBVR use, and what are its dimensions?

TLVH431BQDBVR uses the SC-70 (DCK) package - a 6-pin surface-mount outline measuring 2.00 mm × 1.25 mm. Pin configuration is CATHODE (1), ANODE (2), REF (3), NC (4), NC (5), and substrate (6). This package is 40% smaller than SOT-23-3 and optimized for high-density PCB layouts in portable and automotive electronics where board space is constrained.

Can TLVH431BQDBVR replace a Zener diode in low-voltage applications?

Yes, TLVH431BQDBVR is explicitly designed as a high-performance Zener replacement for voltages ≥1.24 V. It offers <0.1 μA off-state cathode current (vs. ~1–10 μA for typical Zeners), 0.5% initial tolerance (vs. 5–10% for Zeners), and 0.25 Ω dynamic impedance (vs. 5–50 Ω). These characteristics enable tighter regulation, lower leakage, and improved temperature stability - especially critical below 3.3 V where Zener performance degrades significantly.

What is the minimum cathode current required for regulation in TLVH431BQDBVR?

The TLVH431BQDBVR requires a minimum cathode current of 100 μA to maintain regulation, as confirmed in Sections 5.5–5.7 of the TI datasheet. This value holds across the full –40°C to +125°C temperature range. Operating below this threshold risks loss of regulation and degraded reference accuracy. Designers must ensure external biasing networks deliver ≥100 μA under worst-case conditions, including lowest input voltage and highest temperature.

How does TLVH431BQDBVR differ from TL431 in practical design?

TLVH431BQDBVR differs from TL431 in three key ways: (1) lower reference voltage (1.24 V vs. 2.5 V), enabling regulation in 1.8 V/2.5 V systems; (2) lower minimum cathode current (100 μA vs. 1 mA), reducing quiescent power; and (3) extended temperature range (–40°C to +125°C vs. typically –40°C to +85°C). These make TLVH431BQDBVR suitable for modern low-voltage, high-reliability applications where TL431 cannot function.