TL431AIPKG3 Equivalent & Substitute Parts

Part Overview

The TL431AIPKG3 is a shunt voltage reference IC with adjustable output, manufactured by Texas Instruments in SOT-89-3 package. This component functions as a precision voltage reference for power management applications, offering adjustable output from 2.495V to 36V with ±1% tolerance. The part is currently listed as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	TL431AIPKG3
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Package / Case	TO-243AA
Supplier Device Package	SOT-89-3
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	36V
Current - Output	100 mA
Tolerance	±1%
Current - Cathode	700 µA
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	2 (1 Year)

Substitute Part Grouping Explanation

Substitution eligibility for the TL431AIPKG3 is determined by the following critical parameters:

Mandatory Matching Parameters:

Package / Case: TO-243AA
Supplier Device Package: SOT-89-3
Reference Type: Shunt
Output Type: Adjustable
Voltage - Output (Max): 36V
Current - Output: 100 mA
Mounting Type: Surface Mount

Allowable Variation Parameters:

Voltage - Output (Min/Fixed): 2.495V to 2.5V (within design tolerance)
Tolerance: ±1% or better (±0.4%, ±0.5%, ±0.8%, ±1%)
Current - Cathode: 700 µA to 1 mA (within operational range)
Operating Temperature: -40°C ~ 85°C minimum (extended to -40°C ~ 125°C acceptable)
Product Status: Active preferred over obsolete
Packaging Format: Tape & Reel (TR) or Cut Tape (CT) & Digi-Reel®

All substitute parts listed maintain identical electrical performance characteristics and physical form factor compatibility with the original TL431AIPKG3.

Parameter Comparison

Parameter	TL431AIPKG3	TL431AIPK	AS431ARTR-G1	AS431BRTR-E1	AS431BRTR-G1	AZ431AR-ATRE1	AZ431BR-ATRE1
Manufacturer	Texas Instruments	Texas Instruments	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated
Package / Case	TO-243AA	TO-243AA	TO-243AA	TO-243AA	TO-243AA	TO-243AA	TO-243AA
Supplier Device Package	SOT-89-3	SOT-89-3	SOT-89-3	SOT-89-3	SOT-89-3	SOT-89-3	SOT-89-3
Voltage - Output (Min/Fixed)	2.495V	2.495V	2.5V	2.5V	2.5V	2.5V	2.5V
Voltage - Output (Max)	36V	36V	36V	36V	36V	36V	36V
Current - Output	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA
Tolerance	±1%	±1%	±0.5%	±1%	±1%	±0.4%	±0.8%
Current - Cathode	700 µA	700 µA	1 mA	1 mA	1 mA	1 mA	1 mA
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Packaging Format	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)
Moisture Sensitivity Level (MSL)	2 (1 Year)	2 (1 Year)	3 (168 Hours)	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: TL431AIPK

TL431AIPK is the direct Texas Instruments equivalent with identical electrical specifications and operating temperature range. This part maintains the same 700 µA cathode current and ±1% tolerance as the original TL431AIPKG3. The only difference is packaging format (Cut Tape & Digi-Reel® versus Tape & Reel), which does not affect electrical performance. This part is active and maintains full ROHS3 compliance with MSL 2 rating.

Secondary Recommendations: Diodes Incorporated AS431 and AZ431 Series

All Diodes Incorporated substitutes (AS431ARTR-G1, AS431BRTR-E1, AS431BRTR-G1, AZ431AR-ATRE1, AZ431BR-ATRE1) are active products with extended operating temperature range (-40°C ~ 125°C) and improved tolerance specifications (±0.4% to ±1%). These parts feature identical package, voltage output range, and current output specifications. The higher cathode current (1 mA versus 700 µA) and extended temperature range provide enhanced performance margins. All maintain ROHS3 compliance.

Selection Criteria by Application:

For direct replacement with minimal design verification: TL431AIPK
For applications requiring extended temperature operation: AS431ARTR-G1, AS431BRTR-E1, AS431BRTR-G1, AZ431AR-ATRE1, or AZ431BR-ATRE1
For applications requiring tighter tolerance specifications: AZ431AR-ATRE1 (±0.4%) or AS431ARTR-G1 (±0.5%)
For applications with unlimited moisture storage requirements: AS431BRTR-E1 or AZ431BR-ATRE1 (MSL 1)

Frequently Asked Questions (FAQ)

Q: Can TL431AIPK be used as a direct drop-in replacement for TL431AIPKG3?

A: Yes. TL431AIPK is electrically identical to TL431AIPKG3 with matching voltage output range (2.495V to 36V), current output (100 mA), tolerance (±1%), and operating temperature (-40°C ~ 85°C). The difference in packaging format (Cut Tape & Digi-Reel® versus Tape & Reel) does not affect circuit performance or PCB assembly compatibility.

Q: What is the difference between AS431 and AZ431 series substitutes?

A: Both AS431 and AZ431 series are manufactured by Diodes Incorporated and share identical electrical specifications with the TL431AIPKG3. The primary differences are tolerance grades and moisture sensitivity levels. AZ431AR-ATRE1 offers ±0.4% tolerance, AZ431BR-ATRE1 offers ±0.8% tolerance, and AS431ARTR-G1 offers ±0.5% tolerance. AS431BRTR-E1 and AS431BRTR-G1 maintain ±1% tolerance matching the original part.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (TL431AIPK, AS431ARTR-G1, AS431BRTR-E1, AS431BRTR-G1, AZ431AR-ATRE1, AZ431BR-ATRE1) are ROHS3 compliant and REACH unaffected, maintaining regulatory compliance with the original TL431AIPKG3.

Q: What is the significance of the extended operating temperature range in Diodes Incorporated parts?

A: Diodes Incorporated substitutes operate from -40°C to 125°C, compared to the TL431AIPKG3 range of -40°C to 85°C. This extended upper temperature limit provides additional thermal margin for applications operating in elevated ambient conditions or with higher component self-heating.

Q: How does cathode current affect substitution compatibility?

A: The TL431AIPKG3 specifies 700 µA cathode current, while Diodes Incorporated substitutes specify 1 mA. Both values are within acceptable operating ranges for shunt voltage reference applications. The higher cathode current in substitute parts provides improved bias stability and noise performance without affecting circuit compatibility.

Q: What packaging format considerations apply to these substitutes?

A: TL431AIPKG3 is supplied in Tape & Reel (TR) format. TL431AIPK is available in Cut Tape (CT) & Digi-Reel® format. Diodes Incorporated parts are available in either Tape & Reel (TR) or Cut Tape (CT) & Digi-Reel® depending on the specific part number suffix. All formats are compatible with standard surface mount assembly equipment and do not affect electrical performance.

Q: Which substitute offers the best tolerance specification?

A: AZ431AR-ATRE1 offers the tightest tolerance at ±0.4%, followed by AS431ARTR-G1 at ±0.5%, AZ431BR-ATRE1 at ±0.8%, and AS431BRTR-E1 and AS431BRTR-G1 at ±1%. Selection depends on application voltage regulation requirements.

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