STMicroelectronics TS2431ILT

Overview

TS2431ILT from STMicroelectronics is an adjustable precision shunt voltage reference IC used as a programmable voltage threshold detector or error amplifier in feedback loops of switching regulators and linear power supplies. It delivers 2.5–24 V output via external resistor divider, ±2% initial accuracy at 25 °C, 1–100 mA sink current capability, and operates across –40 to +105 °C industrial temperature range - deployed in battery charger feedback networks.

For engineers reviewing the TS2431ILT datasheet, TS2431ILT pinout, TS2431ILT application, or TS2431ILT equivalent, key selection criteria include guaranteed temperature stability (±35 mV over –40 to +105 °C), low dynamic impedance (0.5–0.75 Ω), wide-band noise (300 nV/√Hz), and SOT23-3L space-constrained PCB integration.

Technical Context

The TS2431ILT implements a two-terminal shunt topology with internal bandgap reference and operational amplifier driving an NPN pass transistor. Its cathode-anode voltage regulation is set by external resistive divider connected between cathode, reference, and anode pins - enabling precise output programming without requiring a dedicated supply rail.

It maintains stable regulation under varying load and line conditions due to low temperature coefficient (50–100 ppm/°C), tight initial tolerance (±2%), and minimal reference input current drift (≤3 µA over full temperature range). The device exhibits <2 mV/V line regulation sensitivity and sub-1 µA off-state cathode leakage at 24 V.

Key Specifications

Pinout & Package

TS2431ILT is housed in a compact SOT23-3L surface-mount package (2.9 mm × 2.8 mm × 1.1 mm), optimized for high-density PCB layouts and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL431ACDT and MAX6008AEUR+T, TS2431ILT uniquely combines wide 2.5–24 V adjustability, 100 mA sink capability, and industrial temperature stability - making it optimal for programmable power supply feedback where flexibility and robustness are critical.

Availability

TS2431ILT is available at Aetrix Electronics and suitable for battery chargers, switch-mode power supplies, instrumentation systems, and computer power management requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TS2431ILT 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 microcontrollers, power management ICs, analog components, and MEMS sensors for industrial, automotive, and consumer markets.

The TS2431ILT belongs to ST's precision analog portfolio, engineered specifically for high-reliability voltage reference applications in power conversion, battery management, and industrial instrumentation where accuracy, thermal stability, and small footprint are essential.

FAQ

What is the minimum operating current for TS2431ILT across its full temperature range?

The TS2431ILT requires a minimum cathode current of 1 mA over the full –40 to +105 °C operating range to maintain regulation. At 25 °C, the minimum is lower (0.3–0.8 mA), but design must ensure ≥1 mA under worst-case thermal and load conditions to avoid dropout or instability in feedback loops.

Can TS2431ILT replace TL431 in existing designs without modification?

Yes - TS2431ILT uses the same SOT23-3L package and identical pinout (Anode, Cathode, REF) as TL431, enabling direct replacement. However, its wider 2.5–24 V adjustment range and tighter thermal drift (±35 mV vs. TL431's typical ±50 mV) may require recalculating external resistor values for target output voltage.

How does TS2431ILT achieve low dynamic impedance despite being a shunt reference?

TS2431ILT integrates a high-gain internal op-amp driving a low-on-resistance NPN pass transistor, combined with optimized internal compensation. This architecture achieves 0.5–0.75 Ω dynamic impedance by maintaining strong loop gain across 1–50 mA cathode current swings and up to 10 kHz frequency, minimizing output voltage sag during transients.

Is TS2431ILT suitable for use in automotive applications?

While TS2431ILT operates across –40 to +105 °C - covering many under-hood and cabin environments - it is not AEC-Q100 qualified. It is widely used in automotive aftermarket and non-safety-critical infotainment or body-control modules, but not recommended for ASIL-B or higher safety domains without additional system-level validation.