AP431AG-13 Equivalent & Substitute Parts

Part Overview

The AP431AG-13 is a shunt voltage reference IC manufactured by Diodes Incorporated, designed for adjustable output voltage regulation in power management applications. This component provides a fixed reference voltage of 2.495V with a maximum output of 36V and supports output currents up to 200 mA. The part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute components must maintain functional compatibility across voltage output range, tolerance specifications, and package form factor while meeting current product availability and compliance standards.

Key Parameters

Parameter	AP431AG-13
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	30ppm/°C
Operating Temperature	-20°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the AP431AG-13 are grouped based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Reference Type: Shunt (all substitutes maintain this classification)
Output Type: Adjustable (all substitutes provide adjustable output)
Package / Case: 8-SOIC form factor (mechanical and electrical compatibility)
Voltage Range: Output voltage minimum of 2.495V to 2.5V and maximum of 36V to 37V
Current - Output: Minimum 100 mA (AP431AG-13 specifies 200 mA; substitutes with 100 mA output current are acceptable for applications not requiring full 200 mA capacity)

Secondary Compatibility Parameters:

Tolerance: ±0.5% to ±2% (tighter tolerances provide superior performance)
Temperature Coefficient: 30ppm/°C to 50ppm/°C (acceptable range for thermal stability)
Operating Temperature Range: Minimum -40°C to -20°C; Maximum 70°C to 105°C
RoHS Compliance: ROHS3 Compliant preferred for regulatory alignment

Substitutes are organized by tolerance grade and product status (Active vs. Obsolete) to facilitate selection based on design requirements and supply chain considerations.

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min)	Voltage Output (Max)	Current Output	Tolerance	Temp Coeff	Operating Temp	Package	Product Status	RoHS
AP431AG-13	Diodes Inc.	2.495V	36V	200 mA	±0.5%	30ppm/°C	-20°C ~ 85°C	8-SOIC	Obsolete	ROHS3
KA431DTF	onsemi	2.5V	36V	100 mA	±2%	50ppm/°C	-25°C ~ 85°C	8-SOIC	Active	ROHS3
LM431ACMX	National Semi.	2.5V	36V	100 mA	±2%	50ppm/°C	-25°C ~ 85°C	8-SOIC	Active	ROHS3
LM431AIMX	National Semi.	2.5V	36V	100 mA	±2%	50ppm/°C	-40°C ~ 85°C	8-SOIC	Active	Non-compliant
LM431BCMX	National Semi.	2.495V	36V	100 mA	±1%	50ppm/°C	-25°C ~ 85°C	8-SOIC	Active	ROHS3
LM431CCMX	Texas Instruments	2.5V	37V	100 mA	-0.6%, +0.4%	50ppm/°C	0°C ~ 70°C	8-SOIC	Obsolete	ROHS3
LM431CIMX	onsemi	2.495V	36V	100 mA	±0.5%	50ppm/°C	-40°C ~ 85°C	8-SOIC	Active	ROHS3
TL431ACDG	onsemi	2.495V	36V	100 mA	±1%	50ppm/°C	0°C ~ 70°C	8-SOIC	Active	ROHS3
TL431ACDR2G	onsemi	2.495V	36V	100 mA	±1%	50ppm/°C	0°C ~ 70°C	8-SOIC	Active	ROHS3
TL431AID	STMicroelectronics	2.495V	36V	100 mA	±1%	—	-40°C ~ 105°C	8-SOIC	Obsolete	ROHS3
TL431AIDG	onsemi	2.495V	36V	100 mA	±1%	50ppm/°C	-40°C ~ 85°C	8-SOIC	Active	ROHS3

Engineering Selection Recommendations

Tier 1 - Direct Functional Equivalents (Preferred for New Designs):

LM431CIMX and TL431AIDG are the primary substitutes for AP431AG-13. Both maintain the 2.495V minimum output voltage, ±0.5% tolerance matching the original specification, and operate across -40°C to 85°C temperature range. Both are ROHS3 compliant and carry Active product status, ensuring long-term supply availability. LM431CIMX is manufactured by onsemi with 1810 units in stock; TL431AIDG is also onsemi with 2000 units available.

Tier 2 - Acceptable Substitutes (Tolerance Trade-off):

LM431BCMX provides ±1% tolerance with 2.495V minimum output and Active status. TL431ACDG and TL431ACDR2G both deliver ±1% tolerance at 2.495V minimum output with Active product status. These parts accept slightly relaxed tolerance specifications compared to the original ±0.5% but maintain voltage output compatibility and ROHS3 compliance.

Tier 3 - Functional Alternatives (Reduced Current Capacity):

KA431DTF and LM431ACMX both provide 100 mA output current (versus 200 mA original specification) with ±2% tolerance and 2.5V minimum output. These are suitable only for applications where the reduced current capacity does not impact circuit performance. Both are Active and ROHS3 compliant.

Not Recommended:

LM431AIMX carries RoHS non-compliant status and REACH Affected designation, making it unsuitable for regulated markets. LM431CCMX and TL431AID are Obsolete products, contradicting the objective of replacing an obsolete component with a long-term supply source.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with 100 mA output current if my circuit requires 200 mA?

A: No. Output current is a critical parameter. If your circuit design requires 200 mA, only parts rated for 200 mA or higher are suitable. All listed substitutes except the original AP431AG-13 are rated at 100 mA maximum output current. Verify your actual circuit current requirements before selecting a substitute.

Q: What is the difference between ±0.5%, ±1%, and ±2% tolerance?

A: Tolerance specifies the maximum deviation of the output voltage from the nominal value across operating conditions. ±0.5% tolerance (AP431AG-13, LM431CIMX) provides the tightest voltage regulation. ±1% tolerance (LM431BCMX, TL431ACDG, TL431ACDR2G, TL431AID, TL431AIDG) offers acceptable regulation for most applications. ±2% tolerance (KA431DTF, LM431ACMX) is suitable for less critical voltage reference applications. Select based on your circuit's voltage accuracy requirements.

Q: Are all substitute parts pin-compatible with AP431AG-13?

A: Yes. All listed substitutes use the 8-SOIC (0.154", 3.90mm Width) package, which is mechanically and electrically compatible. However, verify pinout compatibility in the respective datasheets before PCB layout finalization, as some manufacturers may assign different pin functions.

Q: What does "Product Status: Active" mean versus "Obsolete"?

A: Active status indicates the manufacturer continues production and supports long-term supply. Obsolete status means the manufacturer has discontinued production; existing inventory may be available but future supply is not guaranteed. For new designs, select Active status parts to ensure supply chain continuity.

Q: Why do some substitutes have different operating temperature ranges?

A: Operating temperature range reflects the manufacturer's tested and guaranteed performance envelope. AP431AG-13 operates -20°C to 85°C. Substitutes with wider ranges (e.g., TL431AID at -40°C to 105°C) provide additional thermal margin but are not required unless your application demands extended temperature operation. Narrower ranges (e.g., TL431ACDG at 0°C to 70°C) are acceptable only if your circuit operates within those limits.

Q: Is RoHS3 compliance mandatory for my application?

A: RoHS3 compliance is required for products sold in the European Union and many regulated markets. If your end product must meet RoHS requirements, select only ROHS3 compliant substitutes. LM431AIMX is RoHS non-compliant and should be avoided for regulated applications.

Q: Can I substitute AP431AG-13 with a part rated for 36V maximum output if my circuit uses 37V?

A: No. Maximum voltage rating is an absolute limit. Operating at or above the rated maximum voltage risks component failure. LM431CCMX is rated to 37V maximum; parts rated to 36V maximum (AP431AG-13, KA431DTF, LM431ACMX, LM431BCMX, LM431CIMX, TL431ACDG, TL431ACDR2G, TL431AID, TL431AIDG) must not be used in 37V circuits.

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