Texas Instruments TLVH431IDBVTG4

Overview

TLVH431IDBVTG4 from Texas Instruments is a low-voltage adjustable precision shunt regulator with 1.24 V reference voltage, ±1% initial tolerance at 25°C (I-grade), and operation down to 100 μA cathode current. It delivers 0.25 Ω typical dynamic impedance and supports output voltage adjustment from 1.24 V to 18 V using two external resistors - enabling use in isolated flyback SMPS secondary-side regulation and low-voltage Zener replacement.

For engineers reviewing the TLVH431IDBVTG4 datasheet, TLVH431IDBVTG4 pinout, TLVH431IDBVTG4 application, or TLVH431IDBVTG4 equivalent, key selection criteria include cathode current range (100 μA–70 mA), thermal stability across –40°C to +125°C, ultra-low reference input current (≤0.5 μA), and SC-70 package compatibility for space-constrained power monitoring and data converter reference designs.

Technical Context

The TLVH431IDBVTG4 implements a bandgap-referenced error amplifier with Darlington output stage, operating as a 3-terminal adjustable shunt regulator. Its internal 1.24 V reference is compared against the REF pin voltage; when REF exceeds VREF, the cathode sinks current to maintain regulation - enabling closed-loop voltage control without external compensation.

In open-loop mode, it functions as a comparator with integrated reference: cathode switches sharply between high-impedance and sink states at the 1.24 V threshold. The SC-70-6 package (2.00 mm × 1.25 mm) features dedicated ANODE, CATHODE, and REF pins plus three NC/substrate terminals, supporting stable operation with capacitive loads up to 1 nF per phase-margin curves.

Key Specifications

Pinout & Package

TLVH431IDBVTG4 uses the SC-70-6 (DCK) package (2.00 mm × 1.25 mm), featuring six terminals with three functional pins and three no-connect/substrate terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLVH431IDBVTG4, TLVH431ACDBVR trades temperature range for lower cost, while TLVH431BIDBVT improves initial accuracy by 0.5% without sacrificing thermal performance - making the latter optimal for high-precision isolated supplies and the former suitable for consumer-grade embedded power.

Availability

TLVH431IDBVTG4 is available at Aetrix Electronics and suitable for isolated flyback SMPS regulation, precision ADC reference design, and low-voltage power rail monitoring requiring stable component supply across automotive, industrial, and telecom applications.

Supply support for TLVH431IDBVTG4 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 over 90 years of innovation in power management, signal chain, and control ICs.

The TLVH431 family was designed as a low-voltage, low-power successor to TL431 - targeting space-constrained, energy-efficient applications in isolated power supplies, sensor interfaces, and portable instrumentation.

FAQ

What is the reference voltage tolerance of TLVH431IDBVTG4 at 25°C?

The TLVH431IDBVTG4 has a reference voltage tolerance of ±1% at 25°C, corresponding to a 1.24 V nominal value ranging from 1.228 V to 1.252 V. This I-grade specification is verified across the full –40°C to +125°C operating range, with total deviation capped at 31 mV. The tolerance directly impacts feedback divider design margin and system-level voltage accuracy in TLVH431IDBVTG4-based regulators.

Can TLVH431IDBVTG4 operate with cathode current below 100 μA?

No - TLVH431IDBVTG4 requires a minimum cathode current of 100 μA to maintain regulation and specified dynamic impedance. Below this threshold, gain drops significantly, causing poor line/load regulation and increased output impedance. The device may still function as a comparator in open-loop mode at lower currents, but TLVH431IDBVTG4 cannot reliably regulate voltage with IK < 100 μA.

What is the maximum cathode voltage for TLVH431IDBVTG4?

The absolute maximum cathode voltage for TLVH431IDBVTG4 is 20 V relative to the ANODE pin. However, the recommended operating range is 1.24 V to 18 V. Exceeding 18 V risks violating safe operating area limits and may degrade long-term reliability, especially at elevated temperatures. The 20 V rating is a stress limit, not a functional specification for TLVH431IDBVTG4.

How does the SC-70 package of TLVH431IDBVTG4 affect thermal performance?

The SC-70-6 package of TLVH431IDBVTG4 has a junction-to-ambient thermal resistance (RθJA) of 259°C/W, limiting continuous power dissipation to ~150 mW at 25°C ambient. For higher-power applications, PCB copper area under the exposed substrate pad (Pin 6) must be maximized. TLVH431IDBVTG4's thermal design requires careful layout to avoid exceeding 125°C junction temperature under worst-case load and ambient conditions.

Does TLVH431IDBVTG4 require an output capacitor for stability?

No - TLVH431IDBVTG4 is internally compensated and stable without an output capacitor between CATHODE and ANODE. However, if a capacitor is used for noise filtering or transient response improvement, phase-margin data (Figures 5-15 to 5-17) shows stability is maintained up to 1 nF at 1.25 V cathode voltage and 5 V cathode voltage. TLVH431IDBVTG4 remains stable across its full operating range without external compensation.