AS431ARTR-G1 Equivalent & Substitute Parts

Part Overview

The AS431ARTR-G1 is a shunt voltage reference IC manufactured by Diodes Incorporated, designed for adjustable output voltage regulation in power management applications. This component operates with a fixed output voltage of 2.5V and maximum output of 36V, delivering 100 mA with ±0.5% tolerance. The part is currently active in production and widely used in precision voltage reference circuits. Equivalent and substitute parts are identified to address supply chain flexibility, packaging preferences, and specific application requirements while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Manufacturer Part Number	AS431ARTR-G1
Manufacturer	Diodes Incorporated
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.5V
Voltage - Output (Max)	36V
Current - Output	100 mA
Tolerance	±0.5%
Temperature Coefficient	20 ppm/°C Typical
Current - Cathode	1 mA
Operating Temperature	-40°C ~ 125°C (TA)
Package / Case	TO-243AA
Supplier Device Package	SOT-89-3
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the AS431ARTR-G1 are classified based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

Reference Type: Shunt
Output Type: Adjustable
Voltage - Output (Min/Fixed): 2.5V or 2.495V
Voltage - Output (Max): 36V
Current - Output: 100 mA
Package / Case: TO-243AA
Supplier Device Package: SOT-89-3
Mounting Type: Surface Mount

Secondary Considerations:

Tolerance: ±0.5% or ±1%
Operating Temperature Range: -40°C ~ 125°C preferred; -40°C ~ 85°C acceptable; 0°C ~ 70°C limited
Current - Cathode: 1 mA, 600 µA, or 700 µA
Product Status: Active preferred; Obsolete acceptable for legacy designs
Packaging Format: Cut Tape (CT) or Tape & Reel (TR)

Parts are grouped into two categories: Parametric Equivalents (identical electrical specifications) and Manufacturer Recommended Alternatives (functionally compatible with minor parameter variations).

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min)	Voltage Output (Max)	Current Output	Tolerance	Temp Coefficient	Operating Temp	Current Cathode	Packaging	Product Status
AS431ARTR-G1	Diodes Inc.	2.5V	36V	100 mA	±0.5%	20 ppm/°C	-40°C ~ 125°C	1 mA	CT	Active
AS431ARTR-E1	Diodes Inc.	2.5V	36V	100 mA	±0.5%	20 ppm/°C	-40°C ~ 125°C	1 mA	TR	Active
LM431SCCMLX	onsemi	2.495V	36V	100 mA	±0.5%	50 ppm/°C	-25°C ~ 85°C	1 mA	CT	Active
TL431ACPK	Texas Instruments	2.495V	36V	100 mA	±1%	—	0°C ~ 70°C	600 µA	CT	Active
TL431ACPKG3	Texas Instruments	2.495V	36V	100 mA	±1%	—	0°C ~ 70°C	600 µA	TR	Obsolete
TL431AIPK	Texas Instruments	2.495V	36V	100 mA	±1%	—	-40°C ~ 85°C	700 µA	CT	Active
TL431AIPKG3	Texas Instruments	2.495V	36V	100 mA	±1%	—	-40°C ~ 85°C	700 µA	TR	Obsolete
TL431AQPK	Texas Instruments	2.495V	36V	100 mA	±1%	—	-40°C ~ 125°C	700 µA	CT	Active
TL431AQPKG3	Texas Instruments	2.495V	36V	100 mA	±1%	—	-40°C ~ 125°C	700 µA	TR	Obsolete
TL431BCPK	Texas Instruments	2.495V	36V	100 mA	±0.5%	—	0°C ~ 70°C	600 µA	CT	Active
TL431BCPKG3	Texas Instruments	2.495V	36V	100 mA	±0.5%	—	0°C ~ 70°C	600 µA	TR	Obsolete

Engineering Selection Recommendations

Direct Parametric Equivalent (Preferred): AS431ARTR-E1 is the direct equivalent to AS431ARTR-G1, differing only in packaging format (Tape & Reel vs. Cut Tape). Both maintain identical electrical specifications, operating temperature range, and RoHS3 compliance. Selection between these two depends solely on procurement and assembly requirements.

Active Alternatives with ±0.5% Tolerance: LM431SCCMLX (onsemi) and TL431BCPK (Texas Instruments) maintain the ±0.5% tolerance specification. LM431SCCMLX operates within -25°C ~ 85°C, which is narrower than the AS431ARTR-G1 range. TL431BCPK operates within 0°C ~ 70°C, further restricted. Both are suitable for applications where the operating temperature envelope aligns with design requirements.

Active Alternatives with ±1% Tolerance: TL431AIPK and TL431AQPK (Texas Instruments) offer ±1% tolerance with extended or equivalent operating temperature ranges. TL431AIPK covers -40°C ~ 85°C; TL431AQPK covers -40°C ~ 125°C, matching the original part's temperature range. These are suitable for applications where ±1% tolerance is acceptable.

Obsolete Parts: TL431ACPKG3, TL431AIPKG3, TL431AQPKG3, and TL431BCPKG3 are marked as Obsolete. These should be used only for legacy design maintenance or when existing inventory is available. Active alternatives are preferred for new designs.

Compliance & Certifications: All listed parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. Moisture Sensitivity Level varies between MSL 1 (Unlimited) and MSL 3 (168 Hours); design and storage protocols should account for these differences.

Frequently Asked Questions (FAQ)

Q: Can AS431ARTR-E1 replace AS431ARTR-G1 directly? A: Yes. AS431ARTR-E1 is electrically and mechanically identical to AS431ARTR-G1. The only difference is packaging format: AS431ARTR-E1 is supplied in Tape & Reel (TR) format, while AS431ARTR-G1 is Cut Tape (CT). Both are active products with identical specifications.

Q: What is the difference between ±0.5% and ±1% tolerance parts? A: Tolerance specifies the maximum deviation of the output voltage from the nominal value. ±0.5% tolerance provides tighter voltage regulation than ±1%. Applications requiring precise voltage reference should use ±0.5% parts (AS431ARTR-G1, AS431ARTR-E1, LM431SCCMLX, TL431BCPK). Applications with relaxed tolerance requirements may use ±1% alternatives (TL431AIPK, TL431AQPK).

Q: Can I use TL431AIPK instead of AS431ARTR-G1? A: TL431AIPK is functionally compatible but with trade-offs. It maintains the same output voltage range (2.495V ~ 36V) and current (100 mA), but operates at ±1% tolerance versus ±0.5%, and covers -40°C ~ 85°C instead of -40°C ~ 125°C. Use TL431AIPK only if your application tolerates ±1% voltage variation and operates within the -40°C ~ 85°C range.

Q: Why are some parts marked as Obsolete? A: Obsolete parts (TL431ACPKG3, TL431AIPKG3, TL431AQPKG3, TL431BCPKG3) are no longer in active production. These are available only from existing inventory. For new designs, select from Active status parts to ensure long-term supply availability.

Q: What does MSL (Moisture Sensitivity Level) mean? A: MSL indicates how sensitive the component is to moisture during storage and handling. MSL 1 (Unlimited) requires no special moisture control. MSL 3 (168 Hours) requires storage in dry conditions and must be used within 168 hours of opening the moisture barrier bag. AS431ARTR-G1 has MSL 3; AS431ARTR-E1 has MSL 1. Consider MSL requirements when planning inventory and assembly processes.

Q: Are all these parts in the same package? A: Yes. All listed parts use TO-243AA package case with SOT-89-3 supplier device package, enabling direct PCB footprint compatibility. Differences exist only in packaging format (Cut Tape vs. Tape & Reel) for procurement and assembly automation.

Q: Which substitute should I choose for a new design? A: For new designs, prioritize Active status parts with specifications matching your application requirements. If ±0.5% tolerance and -40°C ~ 125°C operation are required, use AS431ARTR-G1 or AS431ARTR-E1. If ±1% tolerance is acceptable and temperature range is -40°C ~ 85°C or better, TL431AIPK is a viable alternative. Verify operating temperature and tolerance requirements against your circuit design before final selection.

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