TL431CPS Equivalent & Substitute Parts

Part Overview

The TL431CPS is a shunt voltage reference IC with adjustable output, manufactured by Texas Instruments. This component functions as a precision voltage reference in power management applications, offering adjustable output between 2.495V and 36V with ±2% tolerance. The TL431CPS is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. Active alternatives maintain core electrical specifications while offering improved availability and modern packaging options.

Substiute Parts

TL431CPS

Texas InstrumentsIn Stock: 5361TL431CPS Datasheet

Current PartRFQ

TL431CDBZR

Texas InstrumentsIn Stock: 26288TL431CDBZR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TL431CPS is determined by equivalence in the following critical parameters:

• Reference Type: Shunt (functional classification)
• Output Type: Adjustable (voltage adjustment capability)
• Voltage Range: 2.495V minimum to 36V maximum output
• Current Rating: 100 mA output capability
• Cathode Current: 1 mA minimum
• Operating Temperature Range: 0°C to 70°C
• Compliance: ROHS3 Compliant, REACH Unaffected

The TL431CDBZR qualifies as a direct substitute based on matching all critical electrical parameters. The primary difference is packaging format and product status transition from obsolete to active.

Parameter Comparison

Engineering Selection Recommendations

The TL431CDBZR is the manufacturer-recommended substitute for the obsolete TL431CPS. Both components maintain identical electrical specifications for reference type, output voltage range, output current, and cathode current. The tolerance specification of the TL431CDBZR (±2.2%) is marginally wider than the TL431CPS (±2%), which remains within acceptable variance for most power management applications utilizing adjustable shunt references.

The TL431CDBZR offers active product status with established supply chain availability, contrasting with the obsolete status of the TL431CPS. Both components carry ROHS3 compliance and unlimited moisture sensitivity classification, ensuring regulatory and environmental compatibility. The transition from 8-SOIC to SOT-23-3 packaging requires PCB layout modification but provides a smaller footprint option.

Frequently Asked Questions (FAQ)

Q: Can the TL431CDBZR directly replace the TL431CPS without circuit modification?

A: Electrical substitution is valid based on matching voltage range, current ratings, and reference type. However, the package change from 8-SOIC to SOT-23-3 requires PCB footprint redesign. Pin configuration must be verified against application schematics before implementation.

Q: What is the significance of the tolerance difference between ±2% and ±2.2%?

A: The TL431CDBZR tolerance of ±2.2% is slightly wider than the TL431CPS tolerance of ±2%. For applications requiring tighter voltage reference accuracy, this difference must be evaluated against circuit design margins. Both tolerances remain within the adjustable shunt reference classification.

Q: Why is the TL431CPS classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The TL431CDBZR represents the active product line continuation, offering equivalent electrical performance with modern packaging and ongoing supply availability.

Q: Are there package-specific considerations for the SOT-23-3 format?

A: The SOT-23-3 package is a smaller surface-mount format compared to the 8-SOIC package. Design considerations include PCB trace routing, thermal management requirements, and assembly process compatibility. Pin assignments must be verified for correct circuit operation.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the TL431CPS and TL431CDBZR are ROHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited) moisture sensitivity classification, ensuring equivalent regulatory and environmental compliance.