TL431CP Equivalent & Substitute Parts

Part Overview

The TL431CP is a shunt voltage reference IC manufactured by Texas Instruments, designed for adjustable voltage regulation applications. It provides a fixed output voltage of 2.495V with adjustability up to 36V, delivering up to 100mA output current with ±2.2% tolerance. The TL431CP is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements.

Substiute Parts

TL431CP

Texas InstrumentsIn Stock: 42656TL431CP Datasheet

Current PartRFQ

TL431CDBZR

Texas InstrumentsIn Stock: 26288TL431CDBZR Datasheet

MFR RecommendedRFQ

TL431IP

onsemiIn Stock: 4351TL431IP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the TL431CP is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Requirements:

• Reference Type: Shunt
• Output Type: Adjustable
• Voltage - Output (Min/Fixed): 2.495V
• Voltage - Output (Max): 36V
• Current - Output: 100mA
• Tolerance: ±2.2%
• Current - Cathode: 1mA

Mechanical Compatibility Requirements:

• Package / Case: 8-DIP (0.300", 7.62mm) for direct pin-compatible replacement
• Mounting Type: Through Hole for PCB assembly compatibility

Substitute parts are grouped into two categories based on package compatibility:

Category 1: Direct Pin-Compatible Replacements (8-DIP Package) Parts maintaining identical 8-DIP through-hole packaging for direct PCB substitution without layout modifications.

Category 2: Functional Equivalents (Alternative Packages) Parts with identical electrical specifications but different package types, requiring PCB redesign or adapter solutions.

Parameter Comparison

Engineering Selection Recommendations

TL431CDBZR (Texas Instruments, SOT-23-3, Active Status)

The TL431CDBZR is a functionally equivalent substitute with identical electrical specifications. It maintains ROHS3 compliance and active product status, ensuring long-term availability and supply chain stability. The SOT-23-3 surface-mount package requires PCB redesign but offers reduced board space and improved thermal characteristics. This part is recommended for new designs where PCB layout modifications are feasible.

TL431IP (onsemi, 8-DIP, Obsolete Status)

The TL431IP provides direct 8-DIP pin compatibility with the TL431CP, enabling drop-in replacement without PCB modifications. However, it carries obsolete product status and RoHS non-compliance, limiting its suitability for new production. This part is suitable only for legacy system maintenance where supply availability permits.

Frequently Asked Questions (FAQ)

Q: Can TL431CDBZR replace TL431CP directly on the PCB?

A: No. The TL431CDBZR uses SOT-23-3 surface-mount packaging versus the 8-DIP through-hole package of TL431CP. Pin configuration and physical dimensions differ, requiring PCB redesign and revalidation.

Q: Is TL431IP a suitable long-term substitute for TL431CP?

A: TL431IP provides pin-compatible replacement capability but carries obsolete product status and RoHS non-compliance. It is suitable for legacy system maintenance only, not for new production designs requiring regulatory compliance.

Q: What are the critical electrical parameters for substitution?

A: Substitution requires matching: Reference Type (Shunt), Output Type (Adjustable), Voltage range (2.495V to 36V), Output Current (100mA), Tolerance (±2.2%), and Cathode Current (1mA). All listed substitutes meet these electrical requirements.

Q: Does operating temperature range affect substitution compatibility?

A: Operating temperature range is a design consideration but does not prevent substitution. TL431IP supports -40°C to 85°C versus TL431CP's 0°C to 70°C. Verify application temperature requirements before selection.

Q: What packaging options are available for new designs?

A: For new designs, TL431CDBZR in SOT-23-3 surface-mount packaging is recommended due to active product status and ROHS3 compliance. This requires PCB layout modification but ensures long-term supply availability.