AP431SAG-7 Equivalent & Substitute Parts

Part Overview

The AP431SAG-7 is a shunt voltage reference IC manufactured by Diodes Incorporated, designed for adjustable voltage regulation applications. This component operates with a fixed output voltage of 2.495V, maximum output voltage of 36V, and supports 200 mA output current with ±1% tolerance in a SOT-23-3 surface mount package.

The AP431SAG-7 is classified as obsolete. Equivalent and substitute parts are available from active product lines, offering improved availability, extended temperature ranges, and enhanced performance characteristics while maintaining functional compatibility for most applications.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	36V
Current - Output	200 mA
Tolerance	±1%
Temperature Coefficient	30 ppm/°C
Current - Cathode	500 µA
Operating Temperature	-20°C ~ 85°C
Package / Case	SOT-23-3
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the AP431SAG-7 is determined by the following critical parameters:

Reference Type & Output Type: All substitutes maintain shunt reference architecture with adjustable output
Voltage Range: Output voltage must span 2.495V minimum to 36V maximum
Tolerance & Accuracy: Substitutes range from ±1% to ±2.2%, with tighter ±0.5% options available
Output Current: Substitutes provide 100 mA or 200 mA capability
Package Compatibility: All substitutes use SOT-23-3 surface mount packaging
Temperature Range: Extended operating ranges (-40°C to 125°C) available in active products
Compliance: All substitutes maintain ROHS3 compliance and EAR99 classification

Substitutes are grouped by manufacturer (Diodes Incorporated and Texas Instruments) and by tolerance grade, allowing selection based on accuracy requirements and thermal performance needs.

Parameter Comparison

Part Number	Manufacturer	Status	Voltage Output (Min)	Voltage Output (Max)	Current Output	Tolerance	Temp Coefficient	Operating Temp	Cathode Current	MSL
AP431SAG-7	Diodes Inc.	Obsolete	2.495V	36V	200 mA	±1%	30 ppm/°C	-20°C ~ 85°C	500 µA	3
AN431BN-ATRG1	Diodes Inc.	Active	2.5V	36V	100 mA	±1%	20 ppm/°C	-40°C ~ 125°C	1 mA	3
AP431WG-7	Diodes Inc.	Obsolete	2.495V	36V	200 mA	±1%	30 ppm/°C	-20°C ~ 85°C	500 µA	3
TL431AIDBZR	Texas Instruments	Active	2.495V	36V	100 mA	±1%	—	-40°C ~ 85°C	700 µA	1
TL431AIDBZT	Texas Instruments	Active	2.495V	36V	100 mA	±1%	—	-40°C ~ 85°C	700 µA	1
TL431BIDBZR	Texas Instruments	Active	2.495V	36V	100 mA	±0.5%	—	-40°C ~ 85°C	700 µA	1
TL431BIDBZRG4	Texas Instruments	Discontinued at DiGi Electronics	2.495V	36V	100 mA	±0.5%	—	-40°C ~ 85°C	700 µA	1
TL431BIDBZT	Texas Instruments	Active	2.495V	36V	100 mA	±0.5%	—	-40°C ~ 85°C	700 µA	1
TL431CDBZR	Texas Instruments	Active	2.495V	36V	100 mA	±2.2%	—	0°C ~ 70°C	1 mA	1
TL431CDBZT	Texas Instruments	Active	2.495V	36V	100 mA	±2.2%	—	0°C ~ 70°C	1 mA	1
TL431IDBZR	Texas Instruments	Active	2.495V	36V	100 mA	±2.2%	—	-40°C ~ 85°C	1 mA	1

Engineering Selection Recommendations

Primary Substitute - Diodes Incorporated Line: AN431BN-ATRG1 is the manufacturer-recommended substitute from Diodes Incorporated. This part maintains ±1% tolerance matching the original specification, operates across an extended temperature range (-40°C to 125°C), and carries active product status with ROHS3 compliance. The reduced output current (100 mA vs. 200 mA) is suitable for applications not requiring maximum current delivery.

Primary Substitute - Texas Instruments Line: TL431AIDBZR and TL431AIDBZT are manufacturer-recommended substitutes from Texas Instruments. Both maintain ±1% tolerance and 2.495V output voltage specification. These parts feature improved MSL rating (1 vs. 3), active product status, and extended temperature range support (-40°C to 85°C). Output current is reduced to 100 mA.

Higher Accuracy Option: TL431BIDBZR, TL431BIDBZRG4, and TL431BIDBZT offer ±0.5% tolerance for applications requiring tighter voltage regulation. These parts are suitable where enhanced accuracy justifies the reduced output current specification.

Cost-Optimized Option: TL431CDBZR and TL431CDBZT provide ±2.2% tolerance with active status. These are appropriate for less stringent accuracy requirements and operate within 0°C to 70°C temperature range.

All recommended substitutes maintain SOT-23-3 packaging, ROHS3 compliance, and EAR99 classification, ensuring regulatory and mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can TL431 series parts directly replace AP431SAG-7? A: Yes. Both series are shunt voltage reference ICs with adjustable output, matching voltage ranges (2.495V to 36V), and identical SOT-23-3 packaging. Functional compatibility is maintained across all listed substitutes.

Q: What is the impact of reduced output current (100 mA vs. 200 mA)? A: The AP431SAG-7 supports 200 mA output current. Most substitutes provide 100 mA. Applications requiring maximum current delivery should verify load requirements before substitution. For typical reference applications, 100 mA is sufficient.

Q: Does tolerance grade affect substitutability? A: Tolerance grade determines voltage accuracy. The original AP431SAG-7 specifies ±1%. Substitutes with ±1% tolerance (AN431BN-ATRG1, TL431AIDBZR, TL431AIDBZT) maintain equivalent accuracy. Tighter ±0.5% options (TL431BIDBZR, TL431BIDBZT) provide improved accuracy. Looser ±2.2% options (TL431CDBZR, TL431CDBZT, TL431IDBZR) are acceptable only where accuracy requirements permit.

Q: What is the significance of MSL rating differences? A: AP431SAG-7 carries MSL 3 (168 hours). Texas Instruments substitutes carry MSL 1 (unlimited). Lower MSL ratings indicate reduced moisture sensitivity and improved shelf life stability. This is an advantage for long-term storage and supply chain resilience.

Q: Are there temperature range limitations with substitutes? A: The original part operates -20°C to 85°C. AN431BN-ATRG1 extends to -40°C to 125°C. Texas Instruments parts support -40°C to 85°C (most grades) or 0°C to 70°C (TL431C grade). Verify application temperature requirements before selection.

Q: Is packaging compatibility guaranteed? A: All listed substitutes use SOT-23-3 surface mount packaging, identical to the original AP431SAG-7. Pin configuration and footprint are compatible. No PCB layout modifications are required.

Q: What compliance certifications apply to substitutes? A: All substitutes maintain ROHS3 compliance and EAR99 classification, matching the original part. REACH status is unaffected across all options.

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