Texas Instruments TLV431ACDBVR

Overview

TLV431ACDBVR from Texas Instruments is a low-voltage adjustable precision shunt regulator with 1.24 V reference voltage, 1% initial tolerance at 25°C, 0.25 Ω typical dynamic impedance, and operation down to 1.24 V cathode-anode voltage - used as an integrated reference in isolated flyback SMPS feedback loops, Zener replacement circuits, and voltage monitoring systems.

For engineers reviewing the TLV431ACDBVR datasheet, TLV431ACDBVR pinout, TLV431ACDBVR application, or TLV431ACDBVR equivalent, key selection considerations include its SC-70-6 package footprint, 80 µA typical minimum cathode current for regulation, –40°C to 85°C industrial temperature range (TLV431AI variant), and compatibility with optocoupler-based secondary-side regulation in 3.3 V output supplies.

Technical Context

The TLV431ACDBVR implements a 3-terminal shunt topology with internal bandgap reference and NPN-based error amplifier driving a Darlington sink output stage. It operates in open-loop comparator mode or closed-loop shunt regulation depending on external feedback configuration between CATHODE and REF pins.

Its design enables stable regulation without output capacitance, supports adjustable output from 1.24 V to 6 V via two external resistors, and delivers sharp turn-on behavior due to high open-loop gain - making it suitable for precision voltage clamping and low-voltage error amplification where traditional TL431 devices cannot operate.

Key Specifications

Pinout & Package

TLV431ACDBVR is housed in an ultra-small SC-70-6 (DCK) package measuring 2.0 mm × 1.5 mm - offering 40% smaller footprint than SOT-23-3 and optimized for space-constrained DC/DC feedback networks.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV431BIDBVR, TLV431ACDBVR trades 0.5% accuracy for lower cost in industrial power supplies; compared with TLVH431ACDBVR, it offers lower quiescent current and better low-VKA performance but limited to 6 V max output - making TLV431ACDBVR optimal for cost-sensitive 3.3 V/5 V isolated SMPS designs.

Availability

TLV431ACDBVR is available at Aetrix Electronics and suitable for isolated flyback SMPS regulation, Zener diode replacement, and voltage monitoring applications requiring stable component supply across automotive infotainment, industrial automation, and consumer power adapter programs.

Supply support for TLV431ACDBVR 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 for industrial, automotive, and personal electronics markets.

The TLV431 family was designed specifically for low-voltage precision shunt regulation in space-constrained power systems - addressing limitations of legacy TL431 devices in sub-3 V applications and enabling next-generation compact AC/DC and DC/DC converters.

FAQ

What is the operating temperature range for TLV431ACDBVR?

The TLV431ACDBVR is rated for industrial operation from –40°C to +85°C (designated TLV431AI). Its electrical characteristics - including 1% VREF tolerance and 6 mV temperature drift - are guaranteed across this full range, making it suitable for deployment in harsh environments like factory automation controllers and outdoor power supplies.

Can TLV431ACDBVR replace a standard Zener diode?

Yes, TLV431ACDBVR can directly replace low-voltage Zener diodes (e.g., 1.2 V to 6 V types) with significant advantages: 1% initial tolerance vs typical 5% Zener tolerance, 0.25 Ω dynamic impedance vs 10–100 Ω for Zeners, and adjustable output via two resistors. It requires only 80 µA minimum cathode current - far less than most Zeners needing >5 mA.

What is the maximum output voltage achievable with TLV431ACDBVR?

The TLV431ACDBVR supports an adjustable output voltage range from 1.24 V (its internal reference) up to 6 V, determined by the external resistor divider network (R1 and R2) connected between CATHODE, REF, and ANODE. This upper limit is defined by absolute maximum cathode voltage (VKA ≤ 6 V) and recommended operating conditions - exceeding 6 V risks device damage.

Does TLV431ACDBVR require an output capacitor for stability?

No, TLV431ACDBVR is internally compensated and remains stable without an output capacitor between CATHODE and ANODE in standard shunt regulator configurations. However, if a capacitive load is added (e.g., for noise filtering), Figure 5-19 in the datasheet provides phase margin vs capacitive load guidance to avoid oscillation - especially critical in high-frequency SMPS feedback paths.

How does TLV431ACDBVR differ from TL431 in practical design?

TLV431ACDBVR differs from TL431 primarily in lower operating voltage (1.24 V vs 2.5 V VREF), lower minimum cathode current (80 µA vs 1 mA), and smaller SC-70 package. These differences enable TLV431ACDBVR to regulate in 1.8 V and 3.3 V systems where TL431 cannot start up, reduce standby power in always-on monitors, and save PCB area - while maintaining identical functional behavior as a 3-terminal shunt reference.