AP431YL-13 Equivalent & Substitute Parts

Part Overview

The AP431YL-13 is a shunt voltage reference IC manufactured by Diodes Incorporated, classified as a Power Management (PMIC) component. This adjustable reference provides a 2.495V to 36V output with ±1% tolerance in a SOT-89-3 surface mount package. The part is currently obsolete, making equivalent substitutes necessary for ongoing design support and production continuity. Substitute parts must maintain electrical compatibility across voltage output range, tolerance specifications, and package form factor while accommodating variations in current output and operating temperature ranges.

Key Parameters

Parameter	Value
Manufacturer Part Number	AP431YL-13
Manufacturer	Diodes Incorporated
Category	Power Management (PMIC)
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	36V
Current - Output	200 mA
Tolerance	±1%
Current - Cathode	500 µA
Operating Temperature	-20°C ~ 85°C
Package / Case	TO-243AA
Supplier Device Package	SOT-89-3
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the AP431YL-13 is determined by the following critical parameters:

Reference Type & Output Type: Must be shunt reference with adjustable output
Voltage Range: Output voltage must span 2.495V minimum to 36V maximum
Tolerance: ±1% tolerance required for direct substitution
Package: SOT-89-3 surface mount package mandatory
Current Output: Minimum 100 mA acceptable (AP431YL-13 specifies 200 mA); higher current capability ensures compatibility
Cathode Current: Acceptable range 500–700 µA
Operating Temperature: Extended range (-40°C to 125°C) provides superior coverage; narrower ranges (-20°C to 85°C, 0°C to 70°C) acceptable for specific applications
Compliance: ROHS3 compliant, REACH unaffected

Texas Instruments TL431 series parts meet these criteria across multiple tolerance and temperature grades. Parts are grouped by tolerance specification (±1% or ±0.5%) and operating temperature range, with packaging variants (Cut Tape or Tape & Reel) available.

Parameter Comparison

Parameter	AP431YL-13	TL431ACPK	TL431AIPK	TL431AQPK	TL431BIPK
Manufacturer	Diodes Inc.	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Reference Type	Shunt	Shunt	Shunt	Shunt	Shunt
Output Type	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable
Voltage - Output (Min)	2.495V	2.495V	2.495V	2.495V	2.495V
Voltage - Output (Max)	36V	36V	36V	36V	36V
Current - Output	200 mA	100 mA	100 mA	100 mA	100 mA
Tolerance	±1%	±1%	±1%	±1%	±0.5%
Current - Cathode	500 µA	600 µA	700 µA	700 µA	700 µA
Operating Temperature	-20°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 85°C
Package / Case	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
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	2 (1 Year)	2 (1 Year)	2 (1 Year)	2 (1 Year)

Engineering Selection Recommendations

Primary Substitutes (Active Product Status)

TL431AIPK and TL431AQPK are recommended as primary substitutes. Both are active products from Texas Instruments with identical electrical specifications to AP431YL-13 (±1% tolerance, 2.495V–36V output range, SOT-89-3 package). TL431AIPK operates across -40°C to 85°C, matching the original operating range. TL431AQPK extends the upper temperature limit to 125°C, providing enhanced thermal margin for applications requiring extended operating conditions. Both parts are ROHS3 compliant with improved moisture sensitivity ratings (MSL 2 vs. MSL 3).

Secondary Substitute (Enhanced Tolerance)

TL431BIPK offers ±0.5% tolerance with -40°C to 85°C operating range. This part provides tighter output voltage accuracy than the original AP431YL-13 specification and is suitable for applications requiring improved reference precision. Product status is active with robust inventory availability.

Packaging Variants

Cut Tape (CT) & Digi-Reel packaging (TL431AIPK, TL431AQPK, TL431BIPK) is preferred for active production. Tape & Reel (TR) variants (TL431ACPKG3, TL431AIPKG3, TL431AQPKG3, TL431BIPKG3) are obsolete but available for legacy support if required.

Current Output Consideration

All TL431 substitutes specify 100 mA output current versus 200 mA for AP431YL-13. This reduction is acceptable for most applications; verify circuit design does not require the full 200 mA output capability before substitution.

Frequently Asked Questions (FAQ)

Q: Can TL431 parts with 100 mA output replace the AP431YL-13 with 200 mA output?

A: Yes, for most applications. The 100 mA specification is sufficient for typical shunt reference circuits. Verify your circuit design does not source more than 100 mA from the reference output. If your application requires the full 200 mA capability, consult alternative reference IC families.

Q: What is the difference between ±1% and ±0.5% tolerance parts?

A: Tolerance specifies the accuracy of the output voltage at nominal conditions. ±1% tolerance (TL431AIPK, TL431AQPK) matches the original AP431YL-13 specification. ±0.5% tolerance (TL431BIPK) provides twice the accuracy and is suitable for precision voltage reference applications. Both are electrically compatible; select based on your circuit accuracy requirements.

Q: Why do operating temperature ranges vary among substitutes?

A: Temperature range defines the guaranteed operating conditions. TL431AIPK (-40°C to 85°C) covers the original AP431YL-13 range. TL431AQPK extends to 125°C for high-temperature applications. TL431ACPK is limited to 0°C to 70°C. Select the temperature range matching your application environment.

Q: Are Cut Tape and Tape & Reel packages electrically identical?

A: Yes. Cut Tape (CT) and Tape & Reel (TR) variants contain identical die and electrical specifications. The difference is packaging format for handling and assembly. Cut Tape is standard for active production; Tape & Reel variants are obsolete but functionally equivalent if inventory is available.

Q: Is the SOT-89-3 package pinout identical across all substitutes?

A: Yes. All listed substitutes use the TO-243AA case style with SOT-89-3 supplier package designation. Pinout is identical: pin 1 (cathode), pin 2 (reference output), pin 3 (anode). Direct PCB footprint compatibility is confirmed.

Q: What does MSL 3 versus MSL 2 mean for moisture sensitivity?

A: MSL (Moisture Sensitivity Level) indicates the component's sensitivity to moisture during storage and handling. MSL 3 (AP431YL-13) requires storage at ≤30% relative humidity or desiccant packaging for 168 hours maximum. MSL 2 (TL431 series) allows 1 year storage under standard conditions, providing more flexible inventory management.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed parts are ROHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements for EU and global markets.

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