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Texas Instruments TL431BCPWG4 — Analog & Data Acquisition
Texas Instruments

TL431BCPWG4 Shunt Reference, ±0.5% Tolerance, 8-TSSOP

MPNTL431BCPWG4
Obsolete

Texas Instruments TL431BCPWG4, adjustable shunt voltage reference, ±0.5% tolerance, 100 mA output, 36 V max, 2.495 V min, 8-TSSOP package, 0°C to 70°C.

TL431BCPWG4 datasheet
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Specifications

TL431BCPWG4 Technical Specifications
ParameterValue
Output typeAdjustable
Mounting typeSurface Mount
Reference typeShunt
Voltage - output36 V
Voltage - output (Min (Fixed))2.495V
Current - output100 mA
Current - cathode600 µA
Operating temperature0°C~70°C(TA)
PackageTray
Tolerance±0.5%
Case8-TSSOP (0.173\", 4.40mm Width)

Product details

Adjustable shunt reference — 2.495 V bandgap core

The B-grade suffix guarantees ±0.5% initial tolerance — tighter than the standard ±1% or ±2% tiers, so it fits precision supplies and comparator thresholds where the reference error must stay under half a percent.

100 mA sink and 600 µA cathode minimum — load and bias math

The device sinks up to 100 mA continuous, which covers driving optocoupler LEDs, biasing error amplifiers in off-line supplies, or setting a precision voltage rail for a few op-amps. The cathode current must stay above 600 µA to keep the reference in regulation — below that the output voltage drifts. Sizing the bias resistor from the supply rail is straightforward: (Vin – Vref) / Ibias must land between 600 µA and 100 mA across all load conditions.

For new designs, a current-production TL431 variant in the same 8-TSSOP package (e.g. TL431BIDBZR, TL431BQDBZR) should be evaluated for pin compatibility and tolerance grade.

8-TSSOP footprint — commercial temperature range

Housed in an 8-TSSOP (4.40 mm wide, 0.65 mm pitch), the TL431BCPWG4 is a surface-mount part for standard PCB assembly.

Frequently asked questions

Is TL431BCPWG4 obsolete?

Yes, Texas Instruments lists the TL431BCPWG4 as obsolete. No direct replacement part number is provided by the manufacturer.

What is the replacement for TL431BCPWG4?

No official successor is published. For new designs, consider a current-production TL431 variant in the same 8-TSSOP package, such as the TL431BIDBZR or TL431BQDBZR — confirm pin compatibility and tolerance grade against your BOM requirements.

What is the difference between TL431BCPWG4 and TL431ACLP?

The TL431BCPWG4 is in an 8-TSSOP surface-mount package with ±0.5% tolerance. The TL431ACLP is a through-hole TO-92 package with ±1% tolerance. The package and tolerance are the primary differences — the electrical core (2.495 V bandgap, 100 mA sink, 36 V max) is the same.

Is TL431BCPWG4 RoHS compliant?

The TL431BCPWG4 is a lead-free (RoHS) part as standard for Texas Instruments' current product line. No explicit RoHS exemption is noted in the listing.