Texas Instruments TLVH431AIDBVTG4

Overview

TLVH431AIDBVTG4 from Texas Instruments is a low-voltage adjustable precision shunt regulator in SC-70 (DCK) package, featuring 1.24 V reference voltage with ±1% tolerance at 25°C, 100 μA minimum cathode current for regulation, 0.25 Ω typical dynamic impedance, and operation from –40°C to +125°C. It serves as an ultra-low-voltage Zener replacement and integrated reference comparator in isolated flyback SMPS feedback loops.

For engineers reviewing the TLVH431AIDBVTG4 datasheet, TLVH431AIDBVTG4 pinout, TLVH431AIDBVTG4 application, or TLVH431AIDBVTG4 equivalent, key selection criteria include reference accuracy over temperature, cathode current headroom in low-power rails, stability with capacitive loads, and compatibility with optocoupler-based secondary-side regulation topologies.

Technical Context

The TLVH431AIDBVTG4 implements a three-terminal shunt topology with internal 1.24 V bandgap reference and high-gain NPN-based error amplifier driving a Darlington sink output stage. Its open-loop mode enables comparator functionality with integrated reference, while closed-loop operation-via resistive divider feedback from cathode to REF-configures it as a programmable shunt regulator from 1.24 V to 18 V.

Unlike the TL431, it operates down to 1.24 V cathode-anode voltage and draws only 100 μA minimum cathode current for regulation. The SC-70 package (2.00 mm × 1.25 mm) provides 40% smaller footprint than SOT-23-3 and supports high-density PCB layouts in space-constrained power management circuits.

Key Specifications

Pinout & Package

TLVH431AIDBVTG4 uses the 6-pin SC-70 (DCK) package (2.00 mm × 1.25 mm), optimized for high-density PCB layouts. Pin 2 is substrate-connected and must be tied to ANODE or left open; pins 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 TLVH431AIDBVTG4, TLVH431BIDBVT offers higher initial accuracy without trade-offs in size or temperature range, while TLV431ACDBVR sacrifices operating temperature margin and package compactness for lower unit cost in non-industrial applications.

Availability

TLVH431AIDBVTG4 is available at Aetrix Electronics and suitable for isolated flyback SMPS design, precision data converter reference, low-power voltage monitoring, and automotive body control module power supervision requiring stable component supply and long-term lifecycle support.

Supply support for TLVH431AIDBVTG4 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 specializing in analog, embedded processing, and power management technologies, with decades of expertise in precision reference and power control ICs.

The TLVH431 family was designed specifically for low-voltage, high-accuracy shunt regulation in space-constrained and thermally demanding applications-including automotive power supplies, industrial PLCs, and isolated DC-DC converters.

FAQ

What is the reference voltage tolerance of TLVH431AIDBVTG4 at 25°C?

The TLVH431AIDBVTG4 has a reference voltage tolerance of ±1% at 25°C, corresponding to its "A" grade designation. This means V_REF is guaranteed between 1.228 V and 1.252 V under nominal conditions, enabling reliable calibration in precision feedback paths without trimming.

Can TLVH431AIDBVTG4 operate in open-loop comparator mode?

Yes, TLVH431AIDBVTG4 functions as a comparator with integrated 1.24 V reference when used without feedback from cathode to REF. With ≥100 μA cathode current, it delivers high open-loop gain and sharp turn-on, making TLVH431AIDBVTG4 ideal for rail monitoring and overvoltage detection circuits.

What is the minimum cathode current required for regulation in TLVH431AIDBVTG4?

The TLVH431AIDBVTG4 requires a minimum cathode current of 100 μA to maintain regulation across its full temperature range. This ultra-low I_K(min) enables stable operation in battery-powered and energy-harvesting systems where TL431-family devices would drop out of regulation.

Does TLVH431AIDBVTG4 require an output capacitor for stability?

No, TLVH431AIDBVTG4 is internally compensated and remains stable without a cathode-to-anode output capacitor. However, if added, capacitor value must be selected per Figures 5-15–5-17 in the datasheet to avoid phase-margin degradation-especially critical in high-capacitance SMPS output stages.

Which package does TLVH431AIDBVTG4 use, and how does it compare to SOT-23-3?

TLVH431AIDBVTG4 uses the 6-pin SC-70 (DCK) package measuring 2.00 mm × 1.25 mm, offering a 40% smaller footprint than the 3-pin SOT-23-3 variant. Though pin-count differs, the SC-70 version maintains identical electrical performance and thermal resistance (R_θJA = 259°C/W), optimizing board area in miniaturized power modules.