STMicroelectronics TLVH431AICT

Overview

TLVH431AICT from STMicroelectronics is a precision adjustable shunt voltage reference IC with 0.5% initial tolerance, 1.24 V to 18 V programmable output, 100 µA minimum operating current, 60 mA sink capability, and ±30 ppm/°C max temperature coefficient. It operates across –40 °C to +125 °C and is used in feedback loops of isolated DC-DC converters and battery charger voltage regulation circuits.

For engineers reviewing the TLVH431AICT datasheet, TLVH431AICT pinout, TLVH431AICT application, or TLVH431AICT equivalent, key selection criteria include cathode-anode voltage range (1.24–18 V), dynamic impedance (0.22 Ω typ), thermal stability (±26.7 mV over full temp range), and SOT323-6L package compatibility with high-density PCB layouts.

Technical Context

The TLVH431AICT functions as a 2-terminal programmable shunt regulator, where the reference input (REF) senses a resistor-divider voltage and controls cathode current to maintain precise output voltage at the cathode–anode terminals. Its internal bandgap reference and error amplifier deliver stable regulation without external compensation.

It supports wide-swing operation (VKA = VREF to 18 V), exhibits low 0.22 Ω dynamic impedance at 10–60 mA cathode current, and maintains regulation down to 100 µA-an essential trait for ultra-low-power systems like energy-harvesting sensors and standby power rails.

Key Specifications

Pinout & Package

SOT323-6L surface-mount package: 1.8 mm × 1.35 mm footprint, 0.65 mm lead pitch, 0.8–1.1 mm height, suitable for space-constrained portable and automotive modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLVH431BICT and TL431CDBVR, TLVH431AICT delivers optimal balance of accuracy (0.5%), programmability (1.24–18 V), and compact SOT323-6L packaging-making it preferred for next-gen space-constrained, wide-output-range power management ICs.

Availability

TLVH431AICT is available at Aetrix Electronics and suitable for isolated DC-DC converters, battery charging systems, and precision data acquisition equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TLVH431AICT 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, MCU, power, and sensor solutions for automotive, industrial, and consumer markets.

The TLVH431 belongs to ST's precision analog reference product line, engineered specifically for high-accuracy, low-power shunt regulation in space-constrained and thermally demanding applications-including automotive body electronics and industrial PLC modules.

FAQ

What is the maximum cathode-to-anode voltage rating for TLVH431AICT?

The absolute maximum cathode-to-anode voltage (VKA) is 22 V per STMicroelectronics' datasheet Table 2. Continuous operation is specified up to 18 V, and exceeding 22 V risks permanent device damage. Derating is recommended above 15 V in high-temperature environments to maintain junction temperature below 150 °C.

Can TLVH431AICT operate with less than 100 µA cathode current?

No-100 µA is the guaranteed minimum cathode current (Ikmin) for regulation across the full –40 °C to +125 °C range. At 25 °C, regulation may begin as low as 60 µA, but this is not characterized or guaranteed. Designs relying on sub-100 µA operation risk output voltage drift and instability.

How does the SOT323-6L package differ from SOT23-3L for TLVH431 variants?

SOT323-6L has identical functional pins (Anode, Cathode, REF) plus three NC terminals, enabling improved thermal performance (RthJA = 221 °C/W vs. 248 °C/W for SOT23-3L) and enhanced PCB layout flexibility. The smaller 1.8 mm × 1.35 mm footprint reduces board area by 32% versus SOT23-3L, critical for wearable and ultra-thin modules.

Is TLVH431AICT pin-compatible with TL431 family devices?

No-TLVH431AICT uses a 6-pin SOT323-6L package with Anode, Cathode, REF, and three NC pins, whereas TL431 devices use 3-pin TO-92, SO-8, or SOT-23 packages with Anode, Cathode, and REF in different physical arrangements. Direct replacement requires PCB redesign and layout verification per ST's package outline drawings.