Texas Instruments TLV431AIDBVRG4

Overview

TLV431AIDBVRG4 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 TLV431AIDBVRG4 datasheet, TLV431AIDBVRG4 pinout, TLV431AIDBVRG4 application, or TLV431AIDBVRG4 equivalent, key selection considerations include reference accuracy over temperature (±6 mV from –40°C to 85°C), SC-70 package footprint (2.0 mm × 1.5 mm), cathode current capability (up to 15 mA), and open-loop comparator functionality with integrated reference.

Technical Context

The TLV431AIDBVRG4 implements a three-terminal adjustable shunt reference architecture with an internal bandgap reference and high-gain NPN-based error amplifier. Its functional modes include closed-loop regulation (as a voltage-controlled current sink) and open-loop comparator operation-both requiring ≥55 µA cathode current for stable linear behavior.

It operates with no external compensation required due to internal frequency compensation, supports direct feedback via two external resistors to set output voltage, and maintains regulation down to 1.24 V cathode-anode voltage-enabling use in 3.3 V and lower-output isolated power supplies where legacy TL431 devices cannot function.

Key Specifications

Pinout & Package

TLV431AIDBVRG4 uses the DCK (SC-70) 6-pin package measuring 2.0 mm × 1.5 mm - 40% smaller than SOT-23-3 - with exposed substrate pad connected to ANODE or left floating per design.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV431ACDBVR, TLV431AIDBVRG4 trades 0.5% accuracy for guaranteed –40°C to +85°C operation; versus TLVH431IDBVR, it offers 40% smaller footprint and lower minimum operating voltage but caps at 6 V output - making it optimal for compact, low-voltage industrial power designs.

Availability

TLV431AIDBVRG4 is available at Aetrix Electronics and suitable for isolated flyback regulation, voltage monitoring, adjustable reference generation, and comparator-based threshold detection requiring stable component supply across automotive, industrial, and embedded power applications.

Supply support for TLV431AIDBVRG4 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 emphasis on power management, signal chain, and real-time control.

The TLV431 family was designed specifically for low-voltage precision shunt regulation and integrated comparator applications in space- and power-constrained systems - targeting isolated DC/DC converters, battery management, and industrial sensor interfaces.

FAQ

What is the maximum cathode voltage rating for TLV431AIDBVRG4?

The absolute maximum cathode-to-anode voltage (VKA) for TLV431AIDBVRG4 is 7 V. Exceeding this value risks permanent damage. In normal operation, VKA must remain between 1.24 V and 6 V to maintain regulation - consistent with its role as a low-voltage alternative to the TL431. The 7 V rating provides margin for transient spikes during startup or fault conditions in TLV431AIDBVRG4-based circuits.

Does TLV431AIDBVRG4 require an external capacitor for stability?

No, TLV431AIDBVRG4 does not require an external output capacitor for stability because it is internally compensated. This eliminates risk of oscillation from capacitive loading on the cathode node - a common issue with uncompensated references. However, if a capacitor is added for filtering, Figure 5-19 in the datasheet provides phase-margin guidance for selecting values up to 10 nF while maintaining stability in TLV431AIDBVRG4 applications.

How does the SC-70 package of TLV431AIDBVRG4 compare to SOT-23-3 in size?

The SC-70 (DCK) package used by TLV431AIDBVRG4 measures 2.0 mm × 1.5 mm, which is 40% smaller than the standard SOT-23-3 footprint (2.92 mm × 2.37 mm). This reduction directly translates to higher PCB density in compact power modules and wearable electronics. Unlike SOT-23-3, the SC-70 has six pins - with two NC pins and one dedicated substrate pin - enabling improved thermal and ESD performance in TLV431AIDBVRG4 layouts.

Can TLV431AIDBVRG4 replace a Zener diode in existing designs?

Yes, TLV431AIDBVRG4 can directly replace low-voltage Zener diodes (e.g., 1.2 V or 1.5 V types) with superior performance: sharper turn-on, lower dynamic impedance (0.25 Ω vs typical Zener's 10–100 Ω), and tighter voltage tolerance (1% vs ±5–10%). It requires only two external resistors to set voltage - unlike fixed-Zener solutions - and draws less current (80 µA min vs Zener's higher leakage). Designers must verify cathode current compliance and adjust resistor values accordingly for TLV431AIDBVRG4 integration.

What is the purpose of Pin 2 (Substrate) on TLV431AIDBVRG4?

Pin 2 on TLV431AIDBVRG4 is the substrate connection, electrically tied to the silicon die backside. Per TI's datasheet, it must be connected to the ANODE node or left unconnected - never floated or tied to another potential. This connection establishes the correct ESD discharge path and improves thermal conduction from die to PCB. Leaving it unconnected may degrade ESD robustness (HBM rating drops below ±2000 V) and increase junction temperature in high-current TLV431AIDBVRG4 operation.