TL431IPKG3 Equivalent & Substitute Parts

Part Overview

The TL431IPKG3 is a shunt voltage reference IC manufactured by Texas Instruments, designed for adjustable voltage regulation applications. This component operates with an adjustable output range of 2.495V to 36V and delivers up to 100mA output current with ±2.2% tolerance. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Active alternatives from both Texas Instruments and Diodes Incorporated provide enhanced specifications and extended product lifecycle support.

Substiute Parts

TL431IPKG3

Texas InstrumentsIn Stock: 2172TL431IPKG3 Datasheet

Current PartRFQ

TL431IPK

Texas InstrumentsIn Stock: 190444TL431IPK Datasheet

MFR RecommendedRFQ

AS431ARTR-G1

Diodes IncorporatedIn Stock: 22177AS431ARTR-G1 Datasheet

MFR RecommendedRFQ

AS431BRTR-E1

Diodes IncorporatedIn Stock: 93324AS431BRTR-E1 Datasheet

MFR RecommendedRFQ

AS431BRTR-G1

Diodes IncorporatedIn Stock: 35126AS431BRTR-G1 Datasheet

MFR RecommendedRFQ

AZ431AR-ATRE1

Diodes IncorporatedIn Stock: 114434AZ431AR-ATRE1 Datasheet

MFR RecommendedRFQ

AZ431BR-ATRE1

Diodes IncorporatedIn Stock: 134294AZ431BR-ATRE1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TL431IPKG3 is determined by the following critical parameters:

Core Electrical Compatibility:

• Reference Type: Shunt (all substitutes maintain this classification)
• Output Type: Adjustable (all substitutes provide adjustable output)
• Voltage Range: Output minimum 2.495V to 2.5V and maximum 36V (all substitutes support this range)
• Current - Output: 100mA (all substitutes deliver this specification)
• Current - Cathode: 1mA (all substitutes maintain this requirement)

Package Compatibility:

• Package / Case: TO-243AA (all substitutes use identical package)
• Supplier Device Package: SOT-89-3 (all substitutes use identical footprint)
• Mounting Type: Surface Mount (all substitutes are surface mount)

Environmental & Compliance:

• Operating Temperature: All substitutes support -40°C to 125°C, which encompasses the TL431IPKG3 range of -40°C to 85°C
• RoHS Status: All substitutes are ROHS3 Compliant
• REACH Status: All substitutes are REACH Unaffected

Tolerance Variations: Substitute parts are grouped by tolerance specification, which affects circuit accuracy but does not prevent functional substitution:

• ±2.2% tolerance: TL431IPK (Texas Instruments)
• ±1% tolerance: AS431BRTR-E1, AS431BRTR-G1 (Diodes Incorporated)
• ±0.8% tolerance: AZ431BR-ATRE1 (Diodes Incorporated)
• ±0.5% tolerance: AS431ARTR-G1 (Diodes Incorporated)
• ±0.4% tolerance: AZ431AR-ATRE1 (Diodes Incorporated)

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: TL431IPK

The TL431IPK from Texas Instruments is the direct functional equivalent to the obsolete TL431IPKG3. Both parts share identical electrical specifications (±2.2% tolerance, 2.495V minimum output, 36V maximum output, 100mA current capacity) and package configuration (TO-243AA, SOT-89-3). The TL431IPK maintains active product status with 190,400 units in stock, ensuring long-term availability. This part requires no circuit redesign and provides seamless drop-in replacement capability. The only difference is packaging format (Cut Tape & Digi-Reel® versus Tape & Reel), which does not affect electrical performance or PCB assembly compatibility.

Secondary Recommendations: Diodes Incorporated AS431 and AZ431 Series

The Diodes Incorporated alternatives (AS431ARTR-G1, AS431BRTR-E1, AS431BRTR-G1, AZ431AR-ATRE1, AZ431BR-ATRE1) are functionally compatible substitutes with enhanced specifications. These parts maintain identical package geometry (TO-243AA, SOT-89-3) and electrical performance envelope (2.5V minimum output, 36V maximum output, 100mA current capacity). All Diodes Incorporated alternatives feature improved tolerance specifications (±0.4% to ±1% versus ±2.2%) and extended operating temperature range (-40°C to 125°C versus -40°C to 85°C). These parts include temperature coefficient specifications (20ppm/°C Typical) not provided for the TL431IPKG3. All alternatives maintain ROHS3 compliance and REACH unaffected status. Selection among Diodes Incorporated options depends on tolerance requirements and moisture sensitivity level (MSL) specifications for your assembly process.

Compliance & Availability:

All recommended substitutes are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. All parts are currently in active production status with substantial inventory availability, ensuring supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can TL431IPK directly replace TL431IPKG3 without circuit modification?

A: Yes. The TL431IPK is electrically and mechanically identical to the TL431IPKG3. Both parts feature the same reference type (shunt), output type (adjustable), voltage range (2.495V to 36V), current capacity (100mA), tolerance (±2.2%), and package configuration (TO-243AA, SOT-89-3). The only difference is packaging format, which does not affect PCB assembly or electrical performance.

Q: What is the difference between TL431IPKG3 and Diodes Incorporated AS431/AZ431 series?

A: The primary differences are manufacturer, tolerance specification, and operating temperature range. The TL431IPKG3 specifies ±2.2% tolerance and -40°C to 85°C operating range. Diodes Incorporated alternatives offer tighter tolerances (±0.4% to ±1%) and extended operating temperature range (-40°C to 125°C). All parts maintain identical package geometry and core electrical specifications (2.5V minimum output, 36V maximum output, 100mA current capacity). Diodes Incorporated parts also provide temperature coefficient specifications (20ppm/°C Typical).

Q: Are all substitute parts compatible with the same PCB footprint?

A: Yes. All substitute parts use the TO-243AA package with SOT-89-3 supplier device package configuration. PCB footprint compatibility is guaranteed across all recommended substitutes. No layout modifications are required.

Q: What is the significance of tolerance differences between substitute parts?

A: Tolerance specification determines the accuracy of the voltage reference output. The TL431IPKG3 specifies ±2.2% tolerance, meaning output voltage can vary by up to 2.2% from the nominal value. Diodes Incorporated alternatives offer tighter tolerances: ±1% (AS431BRTR series), ±0.8% (AZ431BR-ATRE1), ±0.5% (AS431ARTR-G1), and ±0.4% (AZ431AR-ATRE1). Tighter tolerance specifications improve circuit accuracy but do not affect functional compatibility. Selection depends on your circuit's voltage regulation requirements.

Q: Does the extended operating temperature range of Diodes Incorporated parts affect compatibility?

A: No. The extended operating temperature range (-40°C to 125°C for Diodes Incorporated parts versus -40°C to 85°C for TL431IPKG3) represents an enhancement, not a limitation. If your application operates within the TL431IPKG3 temperature range, Diodes Incorporated substitutes will function identically. The extended range provides additional design margin for applications requiring higher temperature operation.

Q: What is the difference between AS431BRTR-E1 and AS431BRTR-G1?

A: Both parts are electrically identical (±1% tolerance, 2.5V to 36V output, 100mA current capacity, 20ppm/°C temperature coefficient). The difference is moisture sensitivity level (MSL): AS431BRTR-E1 specifies MSL 1 (Unlimited shelf life), while AS431BRTR-G1 specifies MSL 3 (168 hours). MSL affects component storage and handling requirements during manufacturing. Select based on your assembly process moisture control capabilities and component storage duration.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All recommended substitute parts (TL431IPK, AS431ARTR-G1, AS431BRTR-E1, AS431BRTR-G1, AZ431AR-ATRE1, AZ431BR-ATRE1) are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.