AP431AYL-13 Equivalent & Substitute Parts

Part Overview

The AP431AYL-13 is a shunt voltage reference IC manufactured by Diodes Incorporated, designed for adjustable voltage regulation applications. This component provides a fixed output voltage of 2.495V with a maximum output of 36V and supports 200 mA output current in a SOT-89-3 surface mount package. The AP431AYL-13 is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active product lines. Substitute parts must maintain compatibility with the SOT-89-3 package and preserve core electrical characteristics for direct circuit replacement.

Key Parameters

Parameter	AP431AYL-13 Specification
Manufacturer	Diodes Incorporated
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	36V
Current - Output	200 mA
Tolerance	±0.5%
Temperature Coefficient	30 ppm/°C
Current - Cathode	500 µA
Operating Temperature	-20°C ~ 85°C
Package / Case	TO-243AA (SOT-89-3)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the AP431AYL-13 is determined by the following critical parameters:

Package Compatibility: All substitute parts must use SOT-89-3 (TO-243AA) surface mount package for direct PCB replacement
Reference Type & Output Type: Shunt reference with adjustable output voltage
Voltage Range: Minimum output 2.495V, maximum output 36V
Output Current: Minimum 100 mA required for functional equivalence
Electrical Tolerance: Tolerance specifications determine precision requirements for the application

The Texas Instruments TL431 series provides direct functional equivalents across multiple tolerance and temperature grade options. All listed substitutes maintain the SOT-89-3 package and adjustable shunt reference architecture. Differences in output current (100 mA vs. 200 mA), tolerance (±0.5% vs. ±1% vs. ±2.2%), and operating temperature ranges define specific use case compatibility.

Parameter Comparison

Parameter	AP431AYL-13	TL431CPK	TL431CPKG3	TL431IPK	TL431IPKG3	TL431QPK	TL431QPKG3	TL431AIPK
Manufacturer	Diodes Inc.	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Reference Type	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt
Output Type	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable
Voltage - Output (Min/Fixed)	2.495V	2.495V	2.495V	2.495V	2.495V	2.495V	2.495V	2.495V
Voltage - Output (Max)	36V	36V	36V	36V	36V	36V	36V	36V
Current - Output	200 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA
Tolerance	±0.5%	±2.2%	±2.2%	±2.2%	±2.2%	±2.2%	±2.2%	±1%
Current - Cathode	500 µA	1 mA	1 mA	1 mA	1 mA	1 mA	1 mA	700 µA
Operating Temperature	-20°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C
Package / Case	TO-243AA	TO-243AA	TO-243AA	TO-243AA	TO-243AA	TO-243AA	TO-243AA	TO-243AA
Product Status	Discontinued	Active	Obsolete	Active	Obsolete	Active	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	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)	2 (1 Year)	2 (1 Year)	2 (1 Year)

Engineering Selection Recommendations

Primary Substitutes (Active Product Status)

TL431IPK and TL431AIPK are the preferred substitutes for the AP431AYL-13. Both parts are in active production status from Texas Instruments, ensuring long-term availability and supply chain stability. TL431IPK operates across -40°C to 85°C, matching the original part's upper temperature limit while extending the lower range. TL431AIPK provides ±1% tolerance, closer to the AP431AYL-13's ±0.5% specification, with identical temperature range coverage.

Secondary Substitutes (Obsolete Product Status)

TL431CPKG3, TL431IPKG3, and TL431QPKG3 are obsolete products and should be selected only when existing inventory is available and long-term supply is not required. These parts maintain full electrical and package compatibility but lack active manufacturing support.

Temperature Range Considerations

Applications requiring operation below 0°C must use TL431IPK, TL431IPKG3, TL431AIPK, or TL431QPK/TL431QPKG3. TL431CPK and TL431CPKG3 are limited to 0°C minimum operating temperature and are unsuitable for extended low-temperature environments.

Output Current Derating

All TL431 substitutes provide 100 mA maximum output current, compared to the AP431AYL-13's 200 mA specification. Applications requiring output currents exceeding 100 mA must be redesigned or alternative reference architectures must be evaluated.

Compliance & Certifications

All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original part's regulatory requirements. Moisture sensitivity levels improve from MSL 3 to MSL 2 across all TL431 variants, reducing handling and storage constraints.

Frequently Asked Questions (FAQ)

Q: Can TL431 series parts directly replace the AP431AYL-13 in existing designs?

A: Direct replacement is possible for applications where output current does not exceed 100 mA. The SOT-89-3 package pinout is identical, and all electrical parameters (voltage range, reference type, adjustable output) are compatible. Applications requiring the full 200 mA output current of the AP431AYL-13 require circuit redesign.

Q: What is the difference between TL431IPK and TL431AIPK?

A: Both parts are active products with identical package and temperature range (-40°C to 85°C). The primary difference is tolerance: TL431IPK specifies ±2.2% tolerance, while TL431AIPK specifies ±1% tolerance. TL431AIPK is preferred when tighter voltage regulation accuracy is required. Cathode current differs slightly (1 mA vs. 700 µA).

Q: Why do some TL431 variants show "Obsolete" status?

A: TL431CPKG3, TL431IPKG3, and TL431QPKG3 are obsolete products no longer manufactured by Texas Instruments. These parts should only be selected if existing inventory is available. For new designs, use active products: TL431CPK, TL431IPK, TL431QPK, or TL431AIPK.

Q: What is the impact of the lower output current (100 mA vs. 200 mA)?

A: The reduced output current capability of TL431 substitutes limits the maximum load current that can be sourced from the reference output. Designs relying on the full 200 mA output must be modified, potentially using external current amplification or alternative reference architectures.

Q: Are there temperature range limitations when selecting a substitute?

A: Yes. TL431CPK and TL431CPKG3 operate only from 0°C to 70°C, making them unsuitable for applications requiring sub-zero operation. For extended temperature range (-40°C to 85°C or -40°C to 125°C), select TL431IPK, TL431IPKG3, TL431AIPK, TL431QPK, or TL431QPKG3.

Q: Does tolerance specification affect circuit performance?

A: Yes. The AP431AYL-13 specifies ±0.5% tolerance, while most TL431 substitutes specify ±2.2%. TL431AIPK provides ±1% tolerance, offering a middle ground. Applications with tight voltage regulation requirements should prioritize TL431AIPK or evaluate circuit design modifications to accommodate wider tolerance ranges.

Q: What is the significance of the temperature coefficient specification?

A: The AP431AYL-13 specifies 30 ppm/°C temperature coefficient. TL431 substitutes do not provide published temperature coefficient values in the supplied data. This parameter should be obtained from Texas Instruments datasheets if temperature stability is critical to the application.

Q: Can I use TL431QPKG3 for high-temperature applications?

A: TL431QPKG3 operates from -40°C to 125°C, supporting the widest temperature range among available substitutes. However, this part is obsolete. For active high-temperature products, TL431QPK provides identical specifications (-40°C to 125°C) with current production status.

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