STMicroelectronics TS432AILT

Overview

TS432AILT from STMicroelectronics is a precision adjustable shunt voltage reference with 1.24 V nominal output, ±0.5% initial accuracy at 25°C, 60 µA maximum operating current, and 100 ppm/°C temperature coefficient over –40°C to +85°C. It operates as a two-terminal programmable reference in feedback loops of switch-mode power supplies and battery chargers.

For engineers reviewing the TS432AILT datasheet, TS432AILT pinout, TS432AILT application, or TS432AILT equivalent, key selection criteria include low-current operation (≤60 µA), tight initial tolerance (±0.5%), stable performance with capacitive loads, and SOT23-3 footprint compatibility in space-constrained industrial power designs.

Technical Context

The TS432AILT functions as a two-terminal shunt reference, requiring only an external resistor divider to set output voltage from 1.24 V to 10 V. Its internal bandgap core delivers high stability across temperature and load variations, with static impedance ≤0.5 Ω and long-term drift of 120 ppm over 1000 hours.

It maintains regulation under wide cathode current range (65 µA to 12 mA) and exhibits ultra-low reference input current (≤100 nA at 25°C), enabling high-impedance feedback networks. Off-state cathode leakage remains ≤150 nA across –40°C to +85°C.

Key Specifications

Pinout & Package

SOT23-3 surface-mount plastic micropackage (ECOPACK® compliant, lead-free); 2.9 mm × 2.64 mm footprint with 0.95 mm pin pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL431AIDBZR and MAX6126AASA+, the TS432AILT uniquely balances ultra-low current (60 µA), adjustable 1.24 V–10 V range, and SOT23-3 size-making it optimal for compact, battery-sensitive industrial power control where fine-tuned reference voltage is required.

Availability

TS432AILT is available at Aetrix Electronics and suitable for battery chargers, switch-mode power supplies, portable instrumentation, and industrial sensor signal chains requiring stable component supply and consistent parametric performance.

Supply support for TS432AILT 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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The TS432 series belongs to ST's precision analog reference product line, engineered specifically for high-accuracy, low-power shunt regulation in space- and energy-constrained industrial power management systems.

FAQ

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

The TS432AILT requires a minimum cathode current of 65 µA across the full industrial temperature range (–40°C to +85°C), as specified in Table 3 of the datasheet. This exceeds the 40–60 µA typical value at 25°C and must be ensured in cold-start conditions using appropriate resistor sizing in the feedback network.

Can the TS432AILT drive a 10 µF capacitor directly without oscillation?

Yes-the TS432AILT is explicitly characterized for stability with capacitive loads up to 10 µF, per the "High stability when used with capacitive loads" feature and Figure 12 test circuit. No external series resistance or compensation is needed, unlike many shunt references that require RC snubbers.

How does the reference input current (IREF) vary with temperature?

IREF increases from ≤50 nA at 25°C to ≤200 nA across –40°C to +85°C (Table 3). This low, predictable variation minimizes gain error in high-impedance resistor dividers, especially critical in battery-operated systems where divider current must remain below 100 nA.

Is the TS432AILT RoHS-compliant and lead-free?

Yes-the TS432AILT uses STMicroelectronics' ECOPACK® packaging, which features lead-free second-level interconnects and complies with RoHS Directive 2011/65/EU. The SOT23-3 package marking and inner box label indicate its environmental compliance per JEDEC Standard JESD97.