Texas Instruments TLVH431BCDBVTG4

Overview

TLVH431BCDBVTG4 from Texas Instruments is a precision adjustable shunt voltage reference IC with 0.5% initial tolerance at 25°C, 1.24 V nominal reference voltage, and operation down to 1.24 V cathode-anode voltage. It delivers stable regulation across –40°C to +125°C, supports cathode currents from 100 µA to 70 mA, and features 0.25 Ω typical dynamic impedance-enabling use as a low-voltage Zener replacement in isolated flyback SMPS feedback loops.

For engineers reviewing the TLVH431BCDBVTG4 datasheet, TLVH431BCDBVTG4 pinout, TLVH431BCDBVTG4 application, or TLVH431BCDBVTG4 equivalent, key selection criteria include its B-grade accuracy, SC-70-6 package footprint, ultra-low minimum cathode current, thermal stability over automotive temperature range, and compatibility with optocoupler-based secondary-side regulation circuits.

Technical Context

The TLVH431BCDBVTG4 implements a bandgap-referenced error amplifier with internal 1.24 V reference and Darlington output stage, operating in either open-loop comparator mode or closed-loop shunt regulator mode. Its functional block includes a high-gain transconductance amplifier comparing REF pin voltage against the internal reference, driving cathode current sink proportional to error.

Unlike the TL431, it achieves regulation at voltages as low as 1.24 V with only 100 µA minimum cathode current, and requires no external compensation capacitor for stability. The device's sharp turn-on characteristic and sub-1 µA reference input current enable precise voltage monitoring and low-power biasing in space-constrained applications.

Key Specifications

Pinout & Package

TLVH431BCDBVTG4 is packaged in a 6-pin SC-70 (DCK) package measuring 2.00 mm × 1.25 mm, offering 40% smaller footprint than SOT-23-3. Pin 2 is substrate-connected and must be tied to ANODE or left open; pins 4 and 5 are NC (no internal connection).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLVH431BIDBVT, TLVH431BCDBVTG4 provides guaranteed operation up to +125°C-critical for engine-control or powertrain modules-while TLVH431BCDBVR offers identical performance in volume-friendly packaging, eliminating any design change when scaling from evaluation to mass production.

Availability

TLVH431BCDBVTG4 is available at Aetrix Electronics and suitable for automotive power management, industrial sensor interfaces, and isolated DC/DC converter designs requiring stable component supply with full Q-grade temperature qualification and traceable sourcing.

Supply support for TLVH431BCDBVTG4 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

Texas Instruments is a global semiconductor leader delivering analog and embedded processing solutions, with deep expertise in precision analog, power management, and signal chain technologies.

The TLVH431 family was designed specifically for low-voltage, high-accuracy shunt regulation in space-constrained and thermally demanding applications-including automotive secondary-side SMPS, battery monitoring, and programmable references for data converters.

FAQ

What is the maximum cathode voltage rating for TLVH431BCDBVTG4?

The absolute maximum cathode-to-anode voltage (V_KA) for TLVH431BCDBVTG4 is 20 V. Operation above this level risks permanent damage. The recommended operating range extends from V_REF (1.24 V) up to 18 V, enabling adjustable output configurations while maintaining reliability and specified electrical performance across the full temperature range.

Does TLVH431BCDBVTG4 require an external compensation capacitor?

No, TLVH431BCDBVTG4 is internally compensated and remains stable without an external capacitor between cathode and anode. This simplifies PCB layout and eliminates capacitor-related instability risks. However, if an output capacitor is used for noise filtering or transient response shaping, Figures 5-15 through 5-17 in the datasheet provide phase-margin guidance for selecting appropriate values based on capacitive load and cathode voltage.

How does the substrate pin (Pin 2) affect TLVH431BCDBVTG4 thermal performance?

Pin 2 in TLVH431BCDBVTG4 is the substrate connection and must be tied to the ANODE node or left open-it is not electrically active but forms part of the thermal conduction path from die to PCB. Leaving it unconnected may reduce thermal dissipation efficiency; connecting it to ANODE improves heat transfer and helps maintain junction temperature within limits during sustained 70 mA cathode operation.

Can TLVH431BCDBVTG4 replace a standard TL431 in existing designs?

TLVH431BCDBVTG4 cannot serve as a direct drop-in replacement for TL431 due to different reference voltage (1.24 V vs. 2.5 V), lower minimum cathode current (100 µA vs. 1 mA), and SC-70-6 vs. TO-92/SOT-23-3 packaging. Circuit redesign-including resistor divider recalculations and layout adaptation-is required to leverage its low-voltage capability and improved accuracy.

What is the typical reference input current (I_ref) for TLVH431BCDBVTG4 at 25°C?

The typical reference input current (I_ref) for TLVH431BCDBVTG4 at 25°C is 0.5 µA, with a maximum of 0.5 µA across all operating conditions per datasheet Section 5.5. This ultra-low value minimizes loading error in high-impedance resistor-divider networks, preserving accuracy in precision voltage-setting applications such as data converter references and threshold detectors.