TL431IPK3 Equivalent & Substitute Parts

Part Overview

The TL431IPK3 is a shunt voltage reference IC with adjustable output, manufactured by Texas Instruments in SOT-89-3 surface mount packaging. This component functions as a precision voltage reference for power management applications, offering adjustable output voltage from 2.495V to 36V with ±2% tolerance and 100mA output current capability. The TL431IPK3 is currently in Last Time Buy status, making identification of suitable substitute components essential for ongoing design support and procurement planning.

Substiute Parts

TL431IPK3

Texas InstrumentsIn Stock: 14057TL431IPK3 Datasheet

Current PartRFQ

TL431IPK

Texas InstrumentsIn Stock: 190444TL431IPK Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TL431IPK3 is determined by strict equivalence across the following critical parameters:

Reference Type: Shunt voltage reference architecture must remain consistent.

Output Type: Adjustable output voltage capability is required.

Voltage Range: Output voltage range of 2.495V minimum to 36V maximum must be maintained.

Output Current: 100mA output current specification must be supported.

Tolerance: Voltage tolerance of ±2% or better (lower tolerance values are acceptable).

Cathode Current: 1mA cathode current specification must be met.

Operating Temperature: -40°C to 85°C operating range must be supported.

Package / Case: TO-243AA package with SOT-89-3 supplier device package designation.

Mounting Type: Surface mount configuration required.

Compliance: RoHS3 compliance required.

The TL431IPK (MFR Recommended) qualifies as a direct substitute based on these parameters, with the exception of tolerance specification (±2.2% versus ±2%), which represents a relaxation of the original specification and remains within acceptable engineering margins for shunt voltage reference applications.

Parameter Comparison

Engineering Selection Recommendations

The TL431IPK is the manufacturer-recommended substitute for the TL431IPK3. Both components are manufactured by Texas Instruments and maintain identical electrical specifications across voltage range, output current, and operating temperature parameters. The primary distinction is product status: the TL431IPK3 is designated Last Time Buy, while the TL431IPK maintains Active status with significantly higher inventory availability (190,400 pieces versus 14,031 pieces).

The tolerance specification difference (±2.2% for TL431IPK versus ±2% for TL431IPK3) represents a 0.2% relaxation. This variance is acceptable for applications where the original ±2% tolerance was not a critical design constraint.

Moisture sensitivity level differs between the two parts (MSL 1 for TL431IPK3 versus MSL 2 for TL431IPK). This distinction affects storage and handling requirements but does not impact electrical performance or functional compatibility.

Both components maintain ROHS3 compliance and identical mechanical packaging (TO-243AA / SOT-89-3), ensuring direct PCB-level compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the TL431IPK directly replace the TL431IPK3 on existing PCBs?

A: Yes. Both components use identical TO-243AA packaging with SOT-89-3 supplier device package designation. Pin configuration and footprint are identical, enabling direct substitution without PCB layout changes.

Q: What is the significance of the tolerance difference (±2% versus ±2.2%)?

A: The TL431IPK tolerance of ±2.2% represents a 0.2% relaxation from the TL431IPK3 specification of ±2%. For applications where voltage reference accuracy is not a critical design parameter, this difference is negligible. For precision applications requiring ±2% tolerance, design validation is necessary.

Q: Why does the TL431IPK3 have Last Time Buy status?

A: Last Time Buy status indicates that Texas Instruments has discontinued this specific part number variant. The TL431IPK remains in Active production status and serves as the ongoing production equivalent.

Q: Are there differences in storage or handling requirements?

A: The TL431IPK3 has Moisture Sensitivity Level 1 (unlimited shelf life), while the TL431IPK has MSL 2 (1-year shelf life). The TL431IPK requires adherence to moisture control protocols during storage and handling to maintain component reliability.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the TL431IPK3 and TL431IPK are ROHS3 compliant and REACH unaffected, meeting identical regulatory requirements for electronic component manufacturing and use.

Q: What is the base product number relationship?

A: Both TL431IPK3 and TL431IPK share the base product number TL431, indicating they are variants within the same product family with identical core functionality and electrical characteristics.