Texas Instruments TLV431AIDBVTG4

Overview

TLV431AIDBVTG4 from Texas Instruments is a low-voltage adjustable precision shunt regulator with 1.24 V reference voltage, 1% initial tolerance at 25°C, and operation from 1.24 V to 6 V output range. It delivers 0.25 Ω typical dynamic impedance, 80 µA typical minimum cathode current, and supports secondary-side regulation in isolated flyback SMPSs.

For engineers reviewing the TLV431AIDBVTG4 datasheet, TLV431AIDBVTG4 pinout, TLV431AIDBVTG4 application, or TLV431AIDBVTG4 equivalent, key selection criteria include reference accuracy over temperature (±6 mV from –40°C to 85°C), ultra-small SC-70 package footprint, open-loop comparator capability with integrated reference, and compatibility with optocoupler-based feedback in 3.3 V systems.

Technical Context

The TLV431AIDBVTG4 implements a bandgap-referenced error amplifier driving a Darlington sink output stage. Its internal architecture enables stable closed-loop shunt regulation without external compensation capacitors while supporting open-loop comparator operation with built-in 1.24 V threshold.

It operates with cathode-to-anode voltage (VKA) as low as 1.24 V and requires ≥55 µA cathode current for regulation across –40°C to 85°C industrial temperature range. The device's reference terminal draws only 0.15–0.5 µA, minimizing resistor-divider loading error in precision feedback networks.

Key Specifications

Pinout & Package

TLV431AIDBVTG4 is housed in an ultra-small SC-70 (DCK) package measuring 2.0 mm × 1.5 mm - 40% smaller than SOT-23-3 - with 6 pins and thermal resistance R_θJA = 87°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV431ACDBVR, TLV431AIDBVTG4 trades 0.5% initial accuracy for guaranteed –40°C to 85°C operation; compared with TLVH431IDBVR, it offers lower cost and identical footprint for ≤6 V, ≤15 mA use cases.

Availability

TLV431AIDBVTG4 is available at Aetrix Electronics and suitable for isolated power supplies, voltage monitoring circuits, programmable current sources, and Zener replacement designs requiring stable component supply and long-term manufacturability.

Supply support for TLV431AIDBVTG4 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 delivering analog and embedded processing solutions with leadership in power management, signal chain, and microcontrollers.

The TLV431 family was designed specifically for low-voltage precision shunt regulation and integrated reference applications in space-constrained, thermally demanding industrial and computing systems.

FAQ

What is the operating temperature range for TLV431AIDBVTG4?

The TLV431AIDBVTG4 is rated for industrial operation from –40°C to +85°C. Its reference voltage deviation over this range is ±6 mV, and minimum cathode current remains 55–80 µA. This makes TLV431AIDBVTG4 suitable for automotive cabin modules, industrial PLC I/O, and outdoor telecom equipment where ambient extremes occur.

Can TLV431AIDBVTG4 replace TL431 in existing designs?

TLV431AIDBVTG4 can replace TL431 only if the application operates at ≥1.24 V and requires ≤6 V output. Unlike TL431 (2.5 V reference), TLV431AIDBVTG4 cannot regulate above 6 V or below 1.24 V. Pinout differs - TLV431AIDBVTG4 uses SC-70 (6-pin) versus TL431's TO-92/SOT-23-3, so PCB redesign is required. TLV431AIDBVTG4 also draws less cathode current (80 µA vs 1 mA), improving light-load efficiency.

How does the SC-70 package of TLV431AIDBVTG4 affect thermal performance?

TLV431AIDBVTG4 in SC-70 (DCK) package has R_θJA = 87°C/W, significantly better than SOT-23-3 variants (206°C/W). This allows higher power dissipation - up to ~140 mW at 25°C ambient - without exceeding 150°C junction limit. Layout best practices include maximizing copper pour under the exposed pad (Pin 2) tied to ANODE, though Pin 2 itself is not electrically active.

Does TLV431AIDBVTG4 require an output capacitor for stability?

No, TLV431AIDBVTG4 is internally compensated and stable without an output capacitor between CATHODE and ANODE. This eliminates capacitor-related aging, leakage, and board space concerns. However, if a capacitor is added for noise filtering, Figure 5-19 in the datasheet shows phase margin vs. capacitive load - stability is maintained up to ~1 nF at VKA = 1.25 V, decreasing to ~100 pF at VKA = 5 V.

What is the maximum cathode voltage (VKA) rating for TLV431AIDBVTG4?

The absolute maximum cathode-to-anode voltage (VKA) for TLV431AIDBVTG4 is 7 V. Operating beyond this risks permanent damage. In normal regulation mode, VKA is set by the external resistor divider and must stay between 1.24 V and 6 V per recommended conditions. For overvoltage clamp applications, ensure transient spikes do not exceed 7 V, or add external clamping (e.g., TVS) upstream of TLV431AIDBVTG4.