AP431QL-7 Equivalent & Substitute Parts

Part Overview

The AP431QL-7 is a shunt voltage reference IC manufactured by Diodes Incorporated, designed for adjustable output voltage regulation in power management applications. This device operates with a fixed output voltage of 2.495V and maximum output of 36V, delivering up to 200 mA with ±1% tolerance. The part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. Texas Instruments TL431 series devices provide direct functional equivalents with active product status and enhanced availability.

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%
Current - Cathode	500 µA
Operating Temperature	-20°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	SC-74A, SOT-753
Supplier Device Package	SOT-25
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the AP431QL-7 is determined by the following critical parameters that must remain constant or compatible:

Reference Type: Shunt (all substitutes maintain this classification)
Output Type: Adjustable (functional equivalence requirement)
Voltage - Output (Min/Fixed): 2.495V (core specification match)
Voltage - Output (Max): 36V (maximum rating match)
Tolerance: ±1% or better (±0.5% substitutes exceed specification)
Mounting Type: Surface Mount (PCB compatibility)
Package / Case: SC-74A, SOT-753 (physical footprint compatibility)

The Texas Instruments TL431 series substitutes meet all electrical and mechanical requirements. Variations in current output (100 mA vs. 200 mA), cathode current (600-700 µA vs. 500 µA), and operating temperature ranges represent acceptable deviations within the shunt reference IC category. All substitutes are active products with superior availability and compliance certifications.

Parameter Comparison

Part Number	Manufacturer	Output Voltage (Min/Fixed)	Output Voltage (Max)	Current - Output	Tolerance	Current - Cathode	Operating Temperature	Package	Product Status	Inventory
AP431QL-7	Diodes Incorporated	2.495V	36V	200 mA	±1%	500 µA	-20°C ~ 85°C	SOT-25	Obsolete	17900 Pcs
TL431ACDBVR	Texas Instruments	2.495V	36V	100 mA	±1%	600 µA	0°C ~ 70°C	SOT-23-5	Active	78100 Pcs
TL431ACDBVT	Texas Instruments	2.495V	36V	100 mA	±1%	600 µA	0°C ~ 70°C	SOT-23-5	Active	11445 Pcs
TL431AIDBVR	Texas Instruments	2.495V	36V	100 mA	±1%	700 µA	-40°C ~ 85°C	SOT-23-5	Active	41300 Pcs
TL431AIDBVT	Texas Instruments	2.495V	36V	100 mA	±1%	700 µA	-40°C ~ 85°C	SOT-23-5	Active	2300 Pcs
TL431AQDBVR	Texas Instruments	2.495V	36V	100 mA	±1%	700 µA	-40°C ~ 125°C	SOT-23-5	Active	23200 Pcs
TL431AQDBVT	Texas Instruments	2.495V	36V	100 mA	±1%	700 µA	-40°C ~ 125°C	SOT-23-5	Active	17630 Pcs
TL431BCDBVR	Texas Instruments	2.495V	36V	100 mA	±0.5%	600 µA	0°C ~ 70°C	SOT-23-5	Active	23300 Pcs
TL431BCDBVT	Texas Instruments	2.495V	36V	100 mA	±0.5%	600 µA	0°C ~ 70°C	SOT-23-5	Active	2416 Pcs
TL431BIDBVR	Texas Instruments	2.495V	36V	100 mA	±0.5%	700 µA	-40°C ~ 85°C	SOT-23-5	Active	2400 Pcs
TL431BIDBVT	Texas Instruments	2.495V	36V	100 mA	±0.5%	700 µA	-40°C ~ 85°C	SOT-23-5	Active	1466 Pcs

Engineering Selection Recommendations

All listed Texas Instruments TL431 series devices are active products with ROHS3 compliance and REACH unaffected status, matching the regulatory requirements of the obsolete AP431QL-7. Selection among substitutes depends on application-specific requirements:

For applications requiring the full -20°C to 85°C operating range of the original part, TL431AIDBVR, TL431AIDBVT, TL431AQDBVR, or TL431AQDBVT are appropriate selections. The TL431AQ variants extend the upper temperature limit to 125°C, providing additional thermal margin for high-temperature environments.

For standard industrial applications operating within 0°C to 70°C, TL431ACDBVR and TL431ACDBVT offer cost-effective substitution with equivalent electrical performance.

Applications requiring enhanced voltage accuracy should specify TL431BC or TL431BI variants, which provide ±0.5% tolerance compared to the ±1% specification of the original part.

Packaging variants (R = Cut Tape & Digi-Reel, T = Tape & Reel) are selected based on procurement and assembly requirements. All devices maintain SC-74A, SOT-753 physical compatibility with SOT-23-5 supplier packaging.

Frequently Asked Questions (FAQ)

Q: Can TL431 series devices directly replace the AP431QL-7 without circuit modifications?

A: Yes. All TL431 substitutes maintain identical shunt reference functionality, adjustable output voltage range (2.495V to 36V), and surface mount package compatibility. Circuit board layouts and component footprints require no modification.

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

A: The AP431QL-7 specifies 200 mA maximum output current, while TL431 substitutes deliver 100 mA. This difference is acceptable when the application circuit limits output current below 100 mA. Applications requiring the full 200 mA output capability must evaluate alternative reference ICs outside the TL431 family.

Q: How do tolerance variations (±1% vs. ±0.5%) affect substitution?

A: TL431BC and TL431BI variants with ±0.5% tolerance exceed the ±1% specification of the AP431QL-7, providing improved voltage accuracy. These are direct substitutes for applications where tighter tolerance is beneficial or required. Standard ±1% TL431AC and TL431AI variants match the original specification exactly.

Q: What operating temperature range should be selected?

A: The AP431QL-7 operates from -20°C to 85°C. TL431ACDBVR/T variants operate 0°C to 70°C (narrower range), while TL431AIDBVR/T and TL431AQDBVR/T extend to -40°C minimum. TL431AQDBVR/T extend to 125°C maximum. Select based on actual application temperature requirements.

Q: Are packaging variants (Cut Tape vs. Tape & Reel) electrically equivalent?

A: Yes. The R (Cut Tape & Digi-Reel) and T (Tape & Reel) designations indicate packaging and delivery format only. Electrical specifications and device performance are identical between variants.

Q: What compliance certifications apply to TL431 substitutes?

A: All TL431 series substitutes are ROHS3 compliant and REACH unaffected, matching the regulatory status of the AP431QL-7. ECCN classification is EAR99 for all devices.

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