TL431IP Equivalent & Substitute Parts

Part Overview

The TL431IP 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 ±2.2% tolerance and supports output currents up to 100 mA. The TL431IP is packaged in an 8-DIP through-hole configuration and is currently classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Substiute Parts

TL431IP

Texas InstrumentsIn Stock: 4328TL431IP Datasheet

Current PartRFQ

TL431IDBZR

Texas InstrumentsIn Stock: 21102TL431IDBZR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TL431IP is determined by electrical parameter equivalence and functional compatibility. The primary substitute, TL431IDBZR, maintains identical electrical specifications including reference type (shunt), output type (adjustable), voltage range (2.495V to 36V), output current (100 mA), tolerance (±2.2%), cathode current (1 mA), and operating temperature range (-40°C to 85°C). The key differentiator is the packaging format: the TL431IDBZR uses surface-mount SOT-23-3 packaging instead of through-hole 8-DIP, requiring circuit board redesign for mechanical compatibility. Both parts share the same base product number (TL431) and maintain ROHS3 compliance and REACH unaffected status. The substitution is valid when electrical performance requirements are met and the surface-mount package is acceptable for the application.

Parameter Comparison

Engineering Selection Recommendations

The TL431IDBZR is the recommended substitute for the obsolete TL431IP when electrical performance requirements are satisfied. Both parts maintain identical electrical specifications and regulatory compliance (ROHS3 compliant, REACH unaffected). The TL431IDBZR offers the advantage of active product status, ensuring long-term availability and supply chain stability compared to the obsolete TL431IP. The primary consideration for selection is packaging compatibility: the TL431IDBZR requires surface-mount assembly and circuit board redesign, whereas the TL431IP uses through-hole mounting. For applications where through-hole mounting is mandatory, alternative solutions outside the TL431 base product family may be required. The TL431IDBZR's MSL rating of 1 (Unlimited) indicates no moisture sensitivity restrictions during storage and handling.

Frequently Asked Questions (FAQ)

Q: Can the TL431IDBZR directly replace the TL431IP without circuit board modifications?

A: No. The TL431IDBZR uses SOT-23-3 surface-mount packaging while the TL431IP uses 8-DIP through-hole packaging. Circuit board redesign is required to accommodate the different footprint and mounting method.

Q: Are the electrical specifications identical between TL431IP and TL431IDBZR?

A: Yes. Both parts provide identical voltage reference performance: adjustable output from 2.495V to 36V, ±2.2% tolerance, 100 mA output current, 1 mA cathode current, and -40°C to 85°C operating temperature range.

Q: Why is the TL431IP classified as obsolete?

A: The TL431IP is an older through-hole package variant. Texas Instruments has transitioned the TL431 product line toward surface-mount packaging options like the SOT-23-3 format used in the TL431IDBZR.

Q: What does the MSL rating difference mean?

A: The TL431IP has no MSL rating (Not Applicable), while the TL431IDBZR has MSL 1 (Unlimited). This means the TL431IDBZR has no moisture sensitivity restrictions and can be stored indefinitely without special humidity controls.

Q: Are both parts RoHS compliant?

A: Yes. Both the TL431IP and TL431IDBZR are ROHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements.

Q: What is the base product number for these parts?

A: Both parts share the base product number TL431, indicating they are variants of the same reference design with different packaging options.