STMicroelectronics TLVH431LIL3T

Overview

TLVH431LIL3T from STMicroelectronics is a 1.5% precision adjustable shunt voltage reference in SOT23-3L package, delivering 1.24 V to 18 V output via external resistor divider, with 100 µA minimum operating current and 100 ppm/°C max temperature coefficient, used in battery charger feedback loops and SMPS error amplifiers.

For engineers reviewing the TLVH431LIL3T datasheet, TLVH431LIL3T pinout, TLVH431LIL3T application, or TLVH431LIL3T equivalent, key selection criteria include cathode-anode voltage range (1.24–18 V), sink current capability (60 mA), thermal stability (-40 to +125 °C), and SOT23-3L footprint compatibility in space-constrained power regulation designs.

Technical Context

The TLVH431LIL3T operates as a two-terminal shunt regulator with internal bandgap reference and transconductance amplifier, requiring only an external resistive divider to set output voltage. Its low 100 µA quiescent current enables use in ultra-low-power battery monitoring circuits.

It maintains regulation across 100 µA–60 mA cathode current, exhibits 0.22 Ω typical dynamic impedance at 10 mA, and achieves ±39 mV total reference voltage variation over -40 to +125 °C due to its 1.5% initial tolerance and 100 ppm/°C tempco.

Key Specifications

Pinout & Package

TLVH431LIL3T is housed in a 3-pin SOT23-3L surface-mount package (JEDEC TO-236AB), with 1.0 mm max height, 2.9 mm × 1.3 mm footprint, and lead-free ECOPACK2 compliance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLVH431AIL3T, the LIL3T trades 1% initial accuracy for lower cost in non-critical regulation; versus TL431BIDBZR, it offers full 1.24–18 V adjustability at the expense of slightly higher tempco-making it optimal for cost-sensitive, variable-output power systems.

Availability

TLVH431LIL3T is available at Aetrix Electronics and suitable for battery chargers, switch-mode power supplies, and data acquisition systems requiring stable component supply with guaranteed long-term manufacturability.

Supply support for TLVH431LIL3T 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 TLVH431 belongs to ST's precision voltage reference product line, engineered specifically for high-accuracy, low-power shunt regulation in space-constrained power management and feedback control applications.

FAQ

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

At -40°C, the TLVH431LIL3T requires a minimum cathode current of 160 µA to maintain regulation, as specified in Table 5 (Ikmin at VKA = VKAmax). This is higher than the 100 µA typical value at 25°C due to increased internal leakage and reduced transconductance at low temperatures.

Can TLVH431LIL3T replace TL431 in existing designs?

Yes, with minor circuit adjustments: TLVH431LIL3T has identical pinout and functional behavior to TL431 but features lower minimum operating current (100 µA vs. 1 mA), wider voltage range (1.24–18 V vs. 2.495–36 V), and improved tempco. Resistor values may need recalculation to match target output voltage.

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

The absolute maximum cathode-to-anode voltage (VKA) is 22 V, per Table 2. Continuous operation above 18 V violates recommended operating conditions and risks exceeding safe operating area limits, especially at elevated temperatures or high cathode currents.

How does the 1.5% precision affect system-level accuracy in a 12 V power supply?

In a 12 V output design using a 24 kΩ/1.2 kΩ resistor divider, the 1.5% reference tolerance contributes ±180 mV output error at 25°C. Combined with resistor tolerances and tempco, total output error remains within ±2%-acceptable for non-critical industrial loads but insufficient for telecom-grade regulation.