Texas Instruments TLVH431BIDBVR

Overview

TLVH431BIDBVR from Texas Instruments is a low-voltage adjustable precision shunt regulator with 0.5% reference voltage tolerance at 25°C, 1.24 V nominal reference voltage, and operation down to 1.24 V cathode-anode voltage. It delivers 100 μA to 70 mA cathode current, 0.25 Ω typical dynamic impedance, and full-spec operation from –40°C to +125°C. It serves as an ultra-low-leakage Zener replacement in isolated flyback SMPS secondary-side regulation.

For engineers reviewing the TLVH431BIDBVR datasheet, TLVH431BIDBVR pinout, TLVH431BIDBVR application, or TLVH431BIDBVR equivalent, key selection criteria include its B-grade 0.5% VREF tolerance, SC-70 package footprint (2.00 mm × 1.25 mm), 100 μA minimum regulation current, and compatibility with optocoupler-based feedback in 3.3 V isolated power supplies.

Technical Context

The TLVH431BIDBVR implements a three-terminal shunt-regulator architecture with an internal 1.24 V bandgap reference and high-gain transconductance amplifier driving a Darlington output stage. Its open-loop comparator mode enables precise voltage monitoring without external references, while closed-loop operation with two external resistors sets output voltage from 1.24 V to 18 V.

It achieves thermal stability over –40°C to +125°C via on-chip temperature compensation, maintains 0.25 Ω dynamic impedance across 0.1 mA–70 mA cathode current, and requires no external compensation capacitor for stability-unlike many linear regulators-due to internal frequency compensation.

Key Specifications

Pinout & Package

TLVH431BIDBVR uses the 6-pin SC-70 (DCK) package with 2.00 mm × 1.25 mm body size. 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-regulator applications.

Compared with TLVH431BIDBVR, TLVH431BIDCKR offers identical performance in reel format for volume manufacturing, while TLVH432BIDBVR provides pinout flexibility for SOT-23-3 layouts-neither is pin-compatible with TLVH431BIDBVR's SC-70 configuration, requiring board-level adaptation.

Availability

TLVH431BIDBVR is available at Aetrix Electronics and suitable for isolated flyback SMPS design, precision ADC reference circuits, and low-voltage rail monitoring applications requiring stable component supply and guaranteed long-term sourcing.

Supply support for TLVH431BIDBVR 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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and power management solutions.

The TLVH431 family was designed for low-voltage, high-accuracy shunt regulation in space- and power-constrained systems-including isolated power supplies, data converter references, and voltage supervision-where traditional TL431 devices cannot operate.

FAQ

What is the reference voltage tolerance of TLVH431BIDBVR at 25°C?

The TLVH431BIDBVR has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 1.234 V to 1.246 V range. This B-grade precision is confirmed in Section 5.7 of the TI datasheet and applies specifically to the TLVH431BIDBVR variant. The tighter tolerance reduces calibration burden in feedback loops and improves absolute accuracy in ADC reference applications where TLVH431BIDBVR is deployed.

Can TLVH431BIDBVR operate with cathode voltage below 2.5 V?

Yes, TLVH431BIDBVR operates down to 1.24 V cathode-to-anode voltage-the lowest in its family-enabling regulation of 1.8 V, 1.2 V, and battery-supplied rails where standard TL431 (2.5 V min) fails. This capability is intrinsic to its bandgap design and is validated across –40°C to +125°C. TLVH431BIDBVR achieves this while maintaining 100 μA minimum cathode current and 0.25 Ω dynamic impedance, making it uniquely suited for low-voltage SMPS and portable electronics.

What package type does TLVH431BIDBVR use, and how does it differ from SOT-23?

TLVH431BIDBVR uses the SC-70 (DCK) package: a 6-pin surface-mount outline measuring 2.00 mm × 1.25 mm. It is 40% smaller than the 3-pin SOT-23-3 package and features dedicated NC pins (4, 5) and substrate-connected Pin 2. Unlike SOT-23 variants (e.g., TLVH431BIDBZ), the SC-70 footprint requires distinct land patterns and stencil design. TLVH431BIDBVR's compact size supports high-density routing in space-limited applications such as wearables and IoT edge nodes.

How does TLVH431BIDBVR function as a comparator?

In open-loop mode, TLVH431BIDBVR acts as a comparator with integrated 1.24 V reference: when voltage at the REF pin exceeds 1.24 V, the CATHODE sinks current; below that threshold, it remains off. This requires ≥100 μA cathode current for sufficient gain and fast response. TLVH431BIDBVR's low I_ref (0.1–0.5 μA) and sharp turn-on make it ideal for rail monitoring without external references. Its behavior is explicitly documented in Section 7.4.1 and Figure 8-2 of the datasheet.

Is an output capacitor required for stability with TLVH431BIDBVR?

No, TLVH431BIDBVR is internally compensated and stable without an output capacitor between CATHODE and ANODE-unlike many linear regulators. This eliminates capacitor-related instability risks from ESR/ESL in compact layouts. However, if a capacitor is added for noise filtering, Figures 5-15 to 5-17 in the datasheet provide phase-margin guidance vs. capacitive load. TLVH431BIDBVR's self-stabilizing architecture simplifies design in isolated feedback and micropower applications.