TL431BCPW Equivalent & Substitute Parts

Part Overview

The TL431BCPW is a shunt voltage reference IC manufactured by Texas Instruments, designed for precision voltage regulation and reference applications. This adjustable reference device operates across a 2.495V to 36V output range with ±0.5% tolerance and supports 100 mA output current in an 8-TSSOP surface mount package. The product is currently obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and component procurement.

Substiute Parts

TL431BCPW

Texas InstrumentsIn Stock: 915TL431BCPW Datasheet

Current PartRFQ

TL431CPWR

Texas InstrumentsIn Stock: 18507TL431CPWR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TL431BCPW is determined by the following critical parameters:

• Reference Type: Shunt voltage reference architecture
• Output Type: Adjustable output voltage capability
• Voltage Range: 2.495V minimum to 36V maximum output
• Current Rating: 100 mA output current capacity
• Package: 8-TSSOP surface mount form factor
• Compliance: ROHS3 and REACH compliance status

The TL431CPWR qualifies as a direct substitute based on matching reference type, output type, voltage range, current rating, and identical package specifications. Variations in tolerance (±2.2% vs ±0.5%) and cathode current (1 mA vs 600 µA) represent acceptable parameter deviations within the shunt reference IC category, provided application requirements permit these differences.

Parameter Comparison

Engineering Selection Recommendations

Both the TL431BCPW and TL431CPWR are obsolete products from Texas Instruments. Selection between these parts depends on application-specific tolerance requirements. The TL431BCPW provides tighter tolerance specification (±0.5%) suitable for precision voltage reference applications requiring high accuracy. The TL431CPWR offers broader tolerance (±2.2%) with higher cathode current specification (1 mA vs 600 µA), appropriate for applications where tolerance margins are acceptable.

Both devices maintain identical ROHS3 compliance, REACH unaffected status, and MSL rating, ensuring regulatory and environmental compatibility. The 8-TSSOP package specification is identical across both parts, confirming PCB layout and thermal management compatibility.

Frequently Asked Questions (FAQ)

Q: Can TL431CPWR directly replace TL431BCPW in existing designs?

A: Direct replacement is possible when application tolerance requirements permit ±2.2% accuracy. If the original design specifies ±0.5% tolerance as a critical parameter, substitution requires circuit validation. Both parts share identical package, voltage range, and current specifications.

Q: What is the significance of the tolerance difference between these parts?

A: The TL431BCPW tolerance of ±0.5% provides tighter initial accuracy compared to TL431CPWR at ±2.2%. Applications requiring precision voltage references for analog-to-digital conversion, power supply feedback networks, or precision current sources should account for this specification difference in circuit design margins.

Q: Are there package compatibility concerns between TL431BCPW and TL431CPWR?

A: No. Both devices use identical 8-TSSOP packaging (0.173" width, 4.40mm). PCB footprints, solder reflow profiles, and thermal management approaches are fully compatible.

Q: What does the cathode current specification difference mean for circuit design?

A: The TL431CPWR cathode current of 1 mA versus TL431BCPW at 600 µA affects the minimum bias current required for stable operation. Circuit designs must ensure adequate cathode current sourcing capability. Higher cathode current in TL431CPWR may require adjustment of bias resistor values in feedback networks.

Q: Are both parts suitable for new designs given their obsolete status?

A: Both TL431BCPW and TL431CPWR are obsolete products. For new designs, evaluation of current-generation shunt voltage reference alternatives from Texas Instruments or other manufacturers is recommended to ensure long-term component availability and supply chain stability.