Texas Instruments TLVH431AIDBVR

Overview

TLVH431AIDBVR from Texas Instruments is a low-voltage adjustable precision shunt regulator IC with 1% initial reference voltage tolerance at 25°C, 1.24 V nominal reference voltage, and operation down to 1.24 V cathode-anode voltage. It delivers stable regulation across –40°C to +125°C, supports cathode current from 100 μA to 70 mA, and features 0.25 Ω typical dynamic impedance - enabling use as a Zener replacement or error amplifier in isolated flyback SMPS feedback loops.

For engineers reviewing the TLVH431AIDBVR datasheet, TLVH431AIDBVR pinout, TLVH431AIDBVR application, or TLVH431AIDBVR equivalent, key selection criteria include its A-grade 1% VREF tolerance, ultra-low minimum cathode current (100 μA), SC-70-6 package footprint, thermal stability over industrial/automotive temperature ranges, and compatibility with optocoupler-based secondary-side regulation circuits.

Technical Context

The TLVH431AIDBVR implements a precision bandgap reference and high-gain transconductance amplifier in a single 3-terminal shunt topology. Its internal Darlington output stage enables sharp turn-on behavior and low dynamic impedance (0.25 Ω), supporting stable closed-loop regulation without external compensation capacitors.

It operates in two distinct functional modes: open-loop comparator mode (with integrated 1.24 V reference) for voltage monitoring, and closed-loop shunt regulator mode (using external resistive divider between cathode and reference pins) to set output voltages from 1.24 V to 18 V. The device requires ≥100 μA cathode current to maintain linear regulation and specified reference accuracy.

Key Specifications

Pinout & Package

TLVH431AIDBVR uses the SC-70-6 (DCK) package: 2.00 mm × 1.25 mm body, 0.65 mm pitch, 6-pin surface-mount outline with exposed pad option. Pin 2 is substrate-connected and must be tied to ANODE or left floating per TI design guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLVH431BIDBVR, TLVH431AIDBVR trades 0.5% initial accuracy for lower cost and sufficient stability for most industrial power monitoring. Against TLVH432AIDBZR, TLVH431AIDBVR offers 40% smaller footprint and improved thermal performance (259°C/W vs 206°C/W) but requires rework of 3-pin layouts to accommodate 6-pin SC-70.

Availability

TLVH431AIDBVR is available at Aetrix Electronics and suitable for isolated SMPS feedback, precision voltage monitoring, data converter references, and low-power rail supervision requiring stable component supply across automotive, industrial, and telecom end equipment.

Supply support for TLVH431AIDBVR 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, embedded processing, and power management ICs, with leadership in precision reference and power control technologies.

The TLVH431 family was designed to replace TL431 in low-voltage applications, delivering 1.24 V reference capability, ultra-low minimum cathode current, and extended temperature operation for next-generation power management in automotive, industrial, and computing systems.

FAQ

What is the reference voltage tolerance of TLVH431AIDBVR at 25°C?

The TLVH431AIDBVR has a reference voltage tolerance of ±1% at 25°C, corresponding to a VREF range of 1.228 V to 1.252 V. This A-grade specification is confirmed in Section 5.6 of the TI datasheet SLVS555N and applies specifically to the TLVH431A variant in SC-70-6 packaging. The tolerance remains stable across the full operating temperature range of –40°C to +125°C, with total deviation limited to ±31 mV for the Q-grade version.

Can TLVH431AIDBVR operate with cathode currents below 100 μA?

No - TLVH431AIDBVR requires a minimum cathode current of 100 μA to maintain regulation and specified reference accuracy. Below this threshold, the internal amplifier exits its linear region, causing VREF to deviate significantly and dynamic impedance to rise sharply. The datasheet specifies IK(min) = 100 μA maximum across temperature, and operation at 60 μA is only guaranteed for initial characterization, not functional reliability.

How does the SC-70-6 package of TLVH431AIDBVR compare thermally to SOT-23 variants?

The TLVH431AIDBVR in SC-70-6 (DCK) package has a junction-to-ambient thermal resistance (RθJA) of 259°C/W, higher than the 206°C/W of SOT-23-3 versions like TLVH432AIDBZR. This reflects its smaller footprint and reduced copper exposure. However, its junction-to-case (top) resistance is 87°C/W, enabling effective heat transfer to PCB copper when the exposed pad is properly soldered - making it viable for 70 mA continuous operation with adequate board layout.

Is TLVH431AIDBVR pin-compatible with TL431 or TLV431?

No - TLVH431AIDBVR is not pin-compatible with TL431 (SOT-23-3, cathode-anode-ref) or TLV431 (SOT-23-3, ref-cathode-anode). It uses a 6-pin SC-70 package with unique pinout: CATHODE–ANODE–REF–NC–NC–NC. Direct replacement requires PCB redesign. Functionally, it replaces TL431 in low-voltage applications but demands different external resistor networks due to its 1.24 V reference versus TL431's 2.5 V.

Does TLVH431AIDBVR require an output capacitor for stability?

No - TLVH431AIDBVR is internally compensated and stable without an output capacitor between cathode and anode. This is explicitly stated in Section 7.3 of the datasheet. However, if an output capacitor is used for filtering, Figures 5-15 through 5-17 provide phase-margin guidance versus capacitive load (up to 100 nF) at various cathode voltages, confirming stability margins remain >36° under recommended conditions.