TL431CPG Equivalent & Substitute Parts

Part Overview

The TL431CPG is a shunt voltage reference IC manufactured by onsemi, designed for precision voltage regulation and reference applications. This adjustable reference provides a 2.495V output with ±2.2% tolerance across a 36V maximum rating, capable of sourcing 100 mA. The device is packaged in an 8-PDIP through-hole configuration and is currently classified as obsolete. Due to its obsolete status, equivalent and substitute parts are necessary for ongoing design support and production continuity.

Substiute Parts

TL431CPG

onsemiIn Stock: 1054TL431CPG Datasheet

Current PartRFQ

NCP431ACSNT1G

onsemiIn Stock: 65159NCP431ACSNT1G Datasheet

DirectRFQ

TL431CP

Texas InstrumentsIn Stock: 42630TL431CP Datasheet

DirectRFQ

TL431ACP

onsemiIn Stock: 4616TL431ACP Datasheet

SimilarRFQ

TL431AIP

onsemiIn Stock: 3333TL431AIP Datasheet

SimilarRFQ

TL431BCP

onsemiIn Stock: 5206TL431BCP Datasheet

SimilarRFQ

TL431BIP

onsemiIn Stock: 863TL431BIP Datasheet

SimilarRFQ

TL431IP

onsemiIn Stock: 4351TL431IP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the TL431CPG is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Reference Type: Shunt (all substitutes must maintain shunt topology)
• Output Type: Adjustable (voltage adjustment capability required)
• Voltage Range: 2.495V minimum output, 36V maximum rating
• Current Output: 100 mA capability
• Tolerance: ±2.2% or better
• Temperature Coefficient: 50ppm/°C Typical
• Operating Temperature: 0°C ~ 70°C minimum range

Mechanical Compatibility Requirements:

• Mounting Type: Through Hole
• Package: 8-DIP (0.300", 7.62mm)

Substitutes are grouped into two categories:

1. Direct Equivalents (Same Package, Same Electrical Specs): Parts maintaining identical electrical parameters and 8-DIP packaging, suitable for direct socket replacement.

2. Functional Equivalents (Different Package, Enhanced Specs): Parts with superior electrical specifications (lower tolerance, higher current capability) but different packaging, requiring circuit board redesign.

Parameter Comparison

Engineering Selection Recommendations

For Direct Socket Replacement (8-DIP Through-Hole):

TL431CP (Texas Instruments) is the primary recommendation for direct substitution. It maintains identical electrical specifications (±2.2% tolerance, 100 mA output, 2.495V minimum) and 8-DIP packaging as the TL431CPG. The part is currently in active production status, ensuring long-term availability and supply chain stability.

For Enhanced Tolerance Applications (8-DIP Through-Hole):

TL431ACP and TL431BCP offer improved tolerance specifications (±1% and ±0.4% respectively) while maintaining the same package and electrical output capability. Both are obsolete but available in inventory. TL431BCP provides the tightest tolerance at ±0.4% for applications requiring superior voltage reference accuracy.

For Extended Temperature Range (8-DIP Through-Hole):

TL431AIP and TL431BIP extend the operating temperature range to -40°C ~ 85°C, suitable for industrial and automotive applications. TL431AIP provides ±1% tolerance while TL431BIP provides ±0.4% tolerance across the extended temperature range. Both are obsolete.

TL431IP matches the original ±2.2% tolerance with extended temperature range (-40°C ~ 85°C) and is obsolete.

For Surface Mount Applications (Functional Equivalent):

NCP431ACSNT1G is an active production part in SOT-23-3 surface mount packaging. This part is not a direct replacement due to different package type and reduced output current (40 µA vs. 100 mA). It is suitable only for new designs where surface mount technology is preferred and output current requirements do not exceed 40 µA.

Frequently Asked Questions (FAQ)

Q: Can TL431CP directly replace TL431CPG?

A: Yes. TL431CP is electrically and mechanically identical to TL431CPG. Both feature ±2.2% tolerance, 100 mA output current, 2.495V minimum voltage, and 8-DIP through-hole packaging. TL431CP is currently in active production, making it the preferred direct replacement.

Q: What is the difference between TL431ACP and TL431BCP?

A: Both maintain identical electrical output (100 mA, 2.495V minimum, 36V maximum) and 8-DIP packaging. The primary difference is tolerance: TL431ACP provides ±1% accuracy while TL431BCP provides ±0.4% accuracy. TL431BCP is selected for applications requiring tighter voltage reference precision.

Q: Can I use TL431AIP instead of TL431ACP?

A: Yes, with consideration for operating temperature. TL431AIP extends the operating range to -40°C ~ 85°C compared to TL431ACP's 0°C ~ 70°C. Both share identical tolerance (±1%), output current (100 mA), and 8-DIP packaging. TL431AIP is suitable for applications requiring wider temperature operation.

Q: Is NCP431ACSNT1G a suitable replacement?

A: NCP431ACSNT1G is not a direct replacement. While it maintains shunt reference topology and ±1% tolerance, it differs in three critical aspects: surface mount SOT-23-3 packaging (versus 8-DIP through-hole), reduced output current (40 µA versus 100 mA), and inverted cathode/output current specifications. This part is suitable only for new designs where surface mount technology is required and output current does not exceed 40 µA.

Q: What determines whether a part can substitute for TL431CPG?

A: Substitution compatibility is determined by: (1) Shunt reference topology, (2) Adjustable output type, (3) Minimum 2.495V output voltage, (4) 36V maximum rating, (5) Minimum 100 mA output current capability, (6) Tolerance equal to or better than ±2.2%, (7) 50ppm/°C temperature coefficient, and (8) Operating temperature range including 0°C ~ 70°C. Package type (8-DIP through-hole) is required for direct socket replacement.

Q: Why is NCP431ACSNT1G listed as a substitute if it cannot directly replace TL431CPG?

A: NCP431ACSNT1G is listed as a functional equivalent for new design applications. It maintains the core shunt reference function and superior tolerance (±1%), but requires circuit board redesign due to different packaging and modified current specifications. It is not suitable for retrofitting existing TL431CPG applications.

Q: Are all listed parts RoHS compliant?

A: No. TL431CPG, TL431ACP, TL431AIP, TL431BCP, TL431BIP, and TL431IP are RoHS non-compliant. TL431CP compliance status is vendor-undefined. NCP431ACSNT1G is ROHS3 compliant. Compliance requirements must be verified against specific application and regulatory standards.