TL431AIPG4 Equivalent & Substitute Parts

Part Overview

The TL431AIPG4 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 ±1% tolerance and supports 100 mA output current. The part is classified as discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement.

Substiute Parts

TL431AIPG4

Texas InstrumentsIn Stock: 822TL431AIPG4 Datasheet

Current PartRFQ

TL431AIP

onsemiIn Stock: 3333TL431AIP Datasheet

MFR RecommendedRFQ

LT1431CN8#PBF

Analog Devices Inc.In Stock: 1402LT1431CN8#PBF Datasheet

MFR RecommendedRFQ

LT1431IN8#PBF

Linear TechnologyIn Stock: 1265LT1431IN8#PBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TL431AIPG4 is determined by the following critical parameters: reference type (shunt), output type (adjustable), voltage output range (2.495V minimum to 36V maximum), output current capability (100 mA), package configuration (8-DIP), and mounting type (through hole). Tolerance and temperature coefficient variations are acceptable within engineering design margins. Operating temperature range differences are noted but do not preclude substitution where application requirements permit.

The identified substitute parts maintain these core electrical and mechanical specifications, enabling direct functional replacement in circuit designs.

Parameter Comparison

Engineering Selection Recommendations

For applications requiring ROHS3 compliance and active product support, the LT1431CN8#PBF from Analog Devices Inc. is the primary substitute. This part maintains all critical electrical parameters, offers superior tolerance (±0.4% versus ±1%), and carries active product status with full compliance certification.

The TL431AIP from onsemi provides functional equivalence with identical electrical specifications and extended temperature range (-40°C to 85°C) but carries RoHS non-compliance status and obsolete product designation.

The LT1431IN8#PBF from Linear Technology matches the extended temperature range and electrical performance of the original part but is classified as obsolete with RoHS non-compliance.

Selection should prioritize product status, compliance requirements, and long-term availability for the target application.

Frequently Asked Questions (FAQ)

Q: Can the LT1431CN8#PBF replace the TL431AIPG4 in all applications?

A: The LT1431CN8#PBF maintains electrical equivalence across all critical parameters: shunt reference type, adjustable output, 2.5V to 36V range, 100 mA output current, and 8-DIP package. The operating temperature range differs (0°C to 70°C versus -40°C to 85°C); applications requiring extended low-temperature operation below 0°C require evaluation against specific design requirements.

Q: What is the significance of the tolerance difference between ±1% and ±0.4%?

A: Tolerance specifications define the initial accuracy of the voltage reference output. The ±0.4% tolerance of the LT1431 series provides tighter initial accuracy compared to the ±1% specification of the TL431AIPG4. Both values are provided as input parameters and do not preclude substitution; circuit design margins should account for the specified tolerance of the selected part.

Q: Are the cathode current differences between 700 µA and 1 mA significant?

A: Cathode current specifications define the minimum operating current required for proper device operation. The 1 mA specification of substitute parts is higher than the 700 µA of the original part. Circuit designs must ensure adequate cathode current supply; this parameter should be evaluated against specific application requirements.

Q: Does RoHS compliance status affect substitution eligibility?

A: RoHS compliance is a regulatory and procurement consideration, not an electrical substitution criterion. The ROHS3-compliant LT1431CN8#PBF is suitable for applications with RoHS requirements. Non-compliant alternatives may be acceptable for applications without such regulatory constraints.

Q: Can the 8-DIP package be substituted with surface-mount alternatives?

A: The specified package type is 8-DIP through-hole. Surface-mount package variants of equivalent reference ICs exist but are not included in this substitution analysis, as package type is a critical mechanical parameter for this application.