Texas Instruments TLVH431BIDCKRG4

Overview

TLVH431BIDCKRG4 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 - ideal for secondary-side feedback in isolated 3.3 V flyback SMPS designs.

For engineers reviewing the TLVH431BIDCKRG4 datasheet, TLVH431BIDCKRG4 pinout, TLVH431BIDCKRG4 application, or TLVH431BIDCKRG4 equivalent, key selection criteria include its SC-70 package footprint, ultra-low reference voltage tolerance, wide cathode current range, thermal stability over automotive-grade temperature range, and compatibility with optocoupler-based isolated feedback loops.

Technical Context

The TLVH431BIDCKRG4 implements a precision bandgap reference and high-gain NPN-based error amplifier in a 3-terminal shunt topology. Its internal architecture enables closed-loop regulation via resistive feedback between cathode and reference pins, or open-loop comparator operation with integrated 1.24 V threshold.

It operates with no external compensation required, exhibits sharp turn-on characteristics due to active output circuitry, and maintains specified performance across –40°C to +125°C (Q-grade) with ≤31 mV VREF deviation over full temperature range and <0.5 μA reference input current.

Key Specifications

Pinout & Package

TLVH431BIDCKRG4 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 while maintaining thermal performance suitable for space-constrained PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLVH431BIDCKRG4, TLVH431BIDBVR offers improved thermal dissipation in a larger SOT-23-5 body, while TLVH431BQDBZR provides identical SC-70 form factor with formal automotive qualification - both preserve the 0.5% tolerance and 1.24 V reference but address mechanical or certification constraints.

Availability

TLVH431BIDCKRG4 is available at Aetrix Electronics and suitable for isolated power supplies, precision voltage monitoring, data converter references, and automotive body electronics requiring stable component supply with guaranteed long-term continuity.

Supply support for TLVH431BIDCKRG4 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 specializing in analog, embedded processing, and power management technologies, with decades of expertise in precision reference and power control ICs.

TLVH431BIDCKRG4 belongs to TI's low-voltage precision shunt reference family, designed specifically to replace Zener diodes and enable efficient, accurate regulation in modern low-voltage and isolated power architectures.

FAQ

What is the reference voltage tolerance of TLVH431BIDCKRG4 at 25°C?

The TLVH431BIDCKRG4 has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 1.24 V nominal V_REF with min/max values of 1.234 V and 1.246 V. This B-grade specification is confirmed in Section 5.7 of the official TI datasheet SLVS555N and applies strictly to the TLVH431B variant in SC-70 packaging.

Can TLVH431BIDCKRG4 operate with cathode voltages below 2.5 V?

Yes, TLVH431BIDCKRG4 is explicitly designed for low-voltage operation starting at 1.24 V cathode-to-anode voltage - significantly lower than the 2.5 V minimum of TL431. It regulates stably down to this threshold, making TLVH431BIDCKRG4 suitable for 1.8 V, 2.5 V, and 3.3 V rail monitoring and feedback applications.

What is the minimum cathode current required for regulation in TLVH431BIDCKRG4?

The TLVH431BIDCKRG4 requires a minimum cathode current of 100 μA to maintain regulation, as specified in Section 5.7 (I_K(min)). This value is valid across the full –40°C to +125°C temperature range and is lower than TL431's 1 mA requirement - enabling micro-power designs.

Does TLVH431BIDCKRG4 require an external output capacitor for stability?

No, TLVH431BIDCKRG4 is internally compensated and remains stable without an external capacitor between cathode and anode. This is confirmed in Section 7.3 of the datasheet. However, if a capacitor is added for noise filtering, Figures 5-15 through 5-17 provide phase-margin guidance for selecting appropriate values based on capacitive load and cathode voltage.

How does the SC-70 package of TLVH431BIDCKRG4 compare to SOT-23 in size and thermal performance?

The TLVH431BIDCKRG4 SC-70 package measures 2.00 mm × 1.25 mm - 40% smaller than the SOT-23-3 variant. Its junction-to-ambient thermal resistance is 259°C/W, higher than SOT-23-3's 206°C/W, meaning it dissipates less power at the same ambient temperature. Layout must account for this reduced thermal margin in high-current applications.