TL431BCP Equivalent & Substitute Parts

Part Overview

The TL431BCP is a shunt voltage reference IC manufactured by Texas Instruments, designed for precision voltage regulation and reference applications. It provides an adjustable output voltage range from 2.495V to 36V with ±0.5% tolerance and supports output currents up to 100 mA. The TL431BCP is packaged in an 8-DIP through-hole configuration and is currently classified as obsolete. Due to its obsolete status and limited availability in modern manufacturing environments, identifying compatible substitute parts is essential for design continuity and production planning.

Substiute Parts

TL431BCP

Texas InstrumentsIn Stock: 5211TL431BCP Datasheet

Current PartRFQ

TL431BCDBZR

Texas InstrumentsIn Stock: 56226TL431BCDBZR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TL431BCP is determined by electrical and functional equivalence across the following critical parameters:

• Reference Type: Shunt voltage reference
• Output Type: Adjustable voltage output
• Voltage Range: 2.495V to 36V output capability
• Output Current: 100 mA maximum
• Tolerance: ±0.5% accuracy
• Cathode Current: 600 µA
• Operating Temperature Range: 0°C to 70°C
• Base Product Number: TL431
• Compliance: ROHS3 Compliant, REACH Unaffected

The TL431BCDBZR maintains identical electrical specifications and functional performance while differing only in packaging format (surface mount SOT-23-3 versus through-hole 8-DIP) and product status (active versus obsolete). This substitution is valid for applications where the PCB layout can accommodate surface-mount technology.

Parameter Comparison

Engineering Selection Recommendations

The TL431BCDBZR is the direct functional equivalent to the TL431BCP, with identical electrical specifications and performance characteristics. The primary distinction is packaging format: the TL431BCDBZR uses surface-mount SOT-23-3 technology versus the through-hole 8-DIP package of the original part.

Selection between these parts depends on PCB design requirements:

• For through-hole PCB designs, the TL431BCP remains the appropriate choice, though availability is limited due to obsolete status.
• For new designs or PCB redesigns, the TL431BCDBZR is the recommended selection due to its active product status, higher inventory availability (56,200 pcs versus 5,133 pcs), and surface-mount compatibility with modern manufacturing processes.

Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compliance across applications.

Frequently Asked Questions (FAQ)

Q: Can the TL431BCDBZR directly replace the TL431BCP in an existing circuit?

A: Electrically, yes. The TL431BCDBZR provides identical voltage reference performance, output current capability, and tolerance specifications. However, physical replacement requires PCB modification due to different package formats (SOT-23-3 surface mount versus 8-DIP through hole). Pin configuration differs between packages and must be verified against the specific application schematic.

Q: What are the key electrical parameters that define substitution compatibility?

A: Substitution compatibility is determined by matching reference type (shunt), output type (adjustable), voltage range (2.495V to 36V), output current (100 mA), tolerance (±0.5%), cathode current (600 µA), and operating temperature range (0°C to 70°C). All these parameters are identical between the TL431BCP and TL431BCDBZR.

Q: Why is the TL431BCP classified as obsolete?

A: The TL431BCP is classified as obsolete due to market transition toward surface-mount packaging technologies. The TL431BCDBZR represents the active product line continuation with equivalent functionality in a modern package format.

Q: Are there compliance differences between the two parts?

A: No. Both the TL431BCP and TL431BCDBZR maintain identical RoHS3 compliance and REACH unaffected status. ECCN and HTSUS classifications are also identical.

Q: What inventory considerations should influence part selection?

A: The TL431BCDBZR has significantly higher inventory availability (56,200 pcs) compared to the TL431BCP (5,133 pcs). For production planning and supply chain continuity, the TL431BCDBZR is the more reliable choice for new procurement.