TL431IP Equivalent & Substitute Parts

Part Overview

The TL431IP is a shunt voltage reference IC manufactured by onsemi, designed for precision voltage regulation applications. This adjustable reference provides a fixed output of 2.495V with a maximum rating of 36V and supports output currents up to 100 mA. The device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The TL431IP operates across an industrial temperature range of -40°C to 85°C and is housed in an 8-PDIP package suitable for through-hole mounting applications.

Substiute Parts

TL431IP

onsemiIn Stock: 4351TL431IP Datasheet

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TL431IP

onsemiIn Stock: 4351TL431IP Datasheet

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LM431AIZ/NOPB

Texas InstrumentsIn Stock: 1820LM431AIZ/NOPB Datasheet

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TL431ACP

onsemiIn Stock: 4616TL431ACP Datasheet

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TL431AIP

onsemiIn Stock: 3333TL431AIP Datasheet

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TL431BCP

onsemiIn Stock: 5206TL431BCP Datasheet

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TL431BIP

onsemiIn Stock: 863TL431BIP Datasheet

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TL431CP

Texas InstrumentsIn Stock: 42630TL431CP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the TL431IP is determined by strict electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

• Reference Type: Shunt (all substitutes must maintain shunt topology)
• Output Type: Adjustable (functional equivalence requirement)
• Voltage - Output (Min/Fixed): 2.495V (must match)
• Voltage - Output (Max): 36V or higher (equal or greater rating acceptable)
• Current - Output: 100 mA (must match)
• Tolerance: ±2.2% or better (tighter tolerance acceptable)
• Temperature Coefficient: 50 ppm/°C Typical (must match)
• Current - Cathode: 1 mA (must match)

Mechanical Compatibility Criteria:

• Package / Case: 8-DIP (0.300", 7.62mm) or equivalent through-hole package
• Mounting Type: Through Hole (required for PCB compatibility)

Substitutes are grouped into two categories: direct package equivalents (8-PDIP) and alternative package options (TO-92-3). All listed substitutes maintain identical electrical specifications with the main part, with variations only in tolerance grades, temperature operating ranges, product status, and RoHS compliance.

Parameter Comparison

Engineering Selection Recommendations

Direct Package Equivalents (8-PDIP):

For applications requiring identical 8-DIP package form factor, TL431CP and TL431AIP provide the most viable paths forward. TL431CP, manufactured by Texas Instruments, maintains active product status and identical electrical specifications to the TL431IP, making it the preferred choice for new designs and production continuity. TL431AIP offers improved tolerance (±1%) while retaining the full industrial temperature range (-40°C to 85°C), suitable for applications demanding higher precision.

For enhanced precision requirements, TL431BIP delivers ±0.4% tolerance with the extended temperature range, though inventory availability is limited. TL431ACP and TL431BCP provide tighter tolerances but operate only across the commercial temperature range (0°C to 70°C), restricting their use to non-industrial applications.

Alternative Package Option (TO-92-3):

LM431AIZ/NOPB, manufactured by Texas Instruments, provides an active product alternative with ROHS3 compliance. This device operates in TO-92-3 package and supports a marginally higher maximum voltage (37V versus 36V). PCB layout modifications are required due to different pin spacing and package geometry. This option is suitable only when package form factor flexibility exists in the design.

Compliance Considerations:

For applications subject to RoHS requirements, LM431AIZ/NOPB is the only ROHS3-compliant option among active products. All onsemi variants remain non-compliant. TL431CP compliance status is vendor-undefined and requires verification with the supplier.

Frequently Asked Questions (FAQ)

Q: Can I substitute TL431IP with TL431CP directly on the PCB?

A: Yes. Both devices use identical 8-DIP package geometry with matching pin assignments. No PCB modifications are required. TL431CP is manufactured by Texas Instruments and maintains active product status, making it suitable for direct replacement.

Q: What is the difference between TL431AIP and TL431BIP?

A: Both devices share identical package, voltage ratings, and current specifications. The primary difference is tolerance: TL431AIP provides ±1% accuracy while TL431BIP delivers ±0.4% accuracy. Both support the full industrial temperature range (-40°C to 85°C). Selection depends on precision requirements of the application.

Q: Why is LM431AIZ/NOPB in a different package?

A: LM431AIZ/NOPB uses TO-92-3 package instead of 8-DIP. While electrically equivalent, the different pin spacing and package footprint require PCB layout modifications. This option is only viable if design flexibility permits package changes.

Q: Are all substitutes compatible with the -40°C to 85°C temperature range?

A: No. TL431ACP, TL431BCP, and TL431CP operate only across 0°C to 70°C. For applications requiring full industrial temperature range (-40°C to 85°C), use TL431AIP, TL431BIP, or LM431AIZ/NOPB.

Q: Which substitute offers the best RoHS compliance?

A: LM431AIZ/NOPB is ROHS3 compliant. All onsemi variants (TL431AIP, TL431ACP, TL431BIP, TL431BCP) are RoHS non-compliant. TL431CP compliance status requires supplier verification.

Q: Can I use a substitute with tighter tolerance than the original specification?

A: Yes. Tighter tolerance (lower percentage) is always acceptable as a substitute. TL431AIP (±1%) and TL431BIP (±0.4%) can replace TL431IP (±2.2%) without functional degradation. The application will benefit from improved accuracy.