STMicroelectronics TLVH431LIL5T

Overview

TLVH431LIL5T from STMicroelectronics is a 1.5% precision adjustable shunt voltage reference in SOT23-5L package, delivering 1.24 V to 18 V output via external resistor divider, with 100 µA minimum operating current, 60 mA sink capability, and operation from –40 °C to +125 °C - used in battery charger feedback loops and isolated SMPS error amplifiers.

For engineers reviewing the TLVH431LIL5T datasheet, TLVH431LIL5T pinout, TLVH431LIL5T application, or TLVH431LIL5T equivalent, key selection criteria include output voltage adjustability range, temperature coefficient (≤100 ppm/°C), cathode current regulation window (100 µA–60 mA), and SOT23-5L thermal resistance (157 °C/W).

Technical Context

The TLVH431LIL5T functions as a two-terminal programmable shunt regulator: its reference input (REF) senses divided output voltage, triggering cathode-to-anode conduction when threshold is exceeded. Regulation stability relies on internal bandgap reference and transconductance amplifier driving an NPN pass transistor.

It operates across a 1.24 V–18 V output range using only two external resistors, maintains ≤100 ppm/°C tempco over –40 °C to +125 °C, and achieves 0.22 Ω typical dynamic impedance at 10–60 mA cathode current - enabling high-accuracy feedback in space-constrained power supplies.

Key Specifications

Pinout & Package

SOT23-5L surface-mount package: 2.9 mm × 1.6 mm footprint, 1.2 mm height, 157 °C/W junction-to-ambient thermal resistance, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLVH431AIL5T, TLVH431LIL5T trades ±0.5% accuracy for lower cost and broader tolerance margin; versus TL431BIDBVR, it offers superior thermal stability (100 vs. 50 ppm/°C) but larger SOT23-5L footprint and higher minimum current (100 µA vs. 60 µA).

Availability

TLVH431LIL5T is available at Aetrix Electronics and suitable for battery chargers, isolated switch-mode power supplies, and energy management systems requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for TLVH431LIL5T 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 industrial, automotive, and consumer markets.

The TLVH431 belongs to ST's precision voltage reference product line, engineered specifically for high-stability, low-power shunt regulation in space-constrained power management and feedback circuits.

FAQ

What is the minimum cathode current required for regulation at –40 °C?

At –40 °C, the TLVH431LIL5T requires 160 µA minimum cathode current to maintain regulation (per Table 5, "I_kmin" row, "V_KA = V_KAmx" condition). This exceeds the 25 °C value of 100 µA and must be accounted for in low-temperature designs to prevent loss of regulation.

Can TLVH431LIL5T replace TL431 in existing SOT-23-3 designs?

No - TLVH431LIL5T uses SOT23-5L (5-pin) while TL431 uses SOT-23-3 (3-pin); pin count, pinout, and internal NC pins differ. Direct replacement requires PCB redesign. For drop-in alternatives, consider TLVH431LIL3T (SOT23-3L variant, same 1.5% tolerance).

How does the 1.5% voltage tolerance affect feedback accuracy in a 12 V SMPS?

With 1.5% tolerance at 25 °C, the reference voltage may vary from 1.222 V to 1.258 V. In a 12 V design using R1=10 kΩ, R2=1.24 kΩ, this causes ±180 mV output variation - acceptable for non-critical industrial supplies but insufficient for USB PD or telecom standards requiring ±1%.

Is external capacitor stabilization required on the REF pin?

No - the TLVH431LIL5T is internally compensated and stable with no external capacitor. However, a 1 nF ceramic capacitor from REF to A is recommended near noisy switching nodes to suppress high-frequency coupling into the sensitive reference input.