LM431SCCMLX Equivalent & Substitute Parts

Part Overview

The LM431SCCMLX is an adjustable shunt voltage reference IC manufactured by onsemi, designed for precision voltage regulation applications. This SOT-89-3 surface mount device delivers 2.495V to 36V output with ±0.5% tolerance and 100 mA output current capability. The part is currently in active production status with 19,172 units in stock. Equivalent and substitute parts are identified based on matching electrical specifications, package compatibility, and functional equivalence in shunt voltage reference applications.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Adjustable
Voltage Output (Min/Fixed)	2.495V
Voltage Output (Max)	36V
Output Current	100 mA
Tolerance	±0.5%
Temperature Coefficient	50 ppm/°C Typical
Cathode Current	1 mA
Operating Temperature	-25°C to 85°C
Package	SOT-89-3 (TO-243AA)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the LM431SCCMLX are qualified based on the following electrical and mechanical parameters:

Primary Matching Criteria:

Reference type: Shunt
Output type: Adjustable
Voltage output range: 2.495V to 36V (or 2.5V to 36V)
Output current: 100 mA
Package: SOT-89-3
Mounting type: Surface Mount
RoHS3 compliance

Tolerance Considerations: Parts with ±0.5% tolerance provide direct equivalence. Parts with ±0.4% or ±1% tolerance are functionally compatible but with different accuracy specifications.

Temperature Range Variations: The LM431SCCMLX operates from -25°C to 85°C. Substitute parts with extended or different temperature ranges remain compatible for applications within the -25°C to 85°C window.

Cathode Current Variations: Cathode current specifications (600 µA to 1 mA) do not prevent substitution; these represent different bias current requirements and are application-dependent.

Parameter Comparison

Part Number	Manufacturer	Tolerance	Voltage Output (Min)	Voltage Output (Max)	Output Current	Operating Temp	Cathode Current	Status	Package
LM431SCCMLX	onsemi	±0.5%	2.495V	36V	100 mA	-25°C to 85°C	1 mA	Active	SOT-89-3
AZ431AR-ATRE1	Diodes Incorporated	±0.4%	2.5V	36V	100 mA	-40°C to 125°C	1 mA	Active	SOT-89-3
AZ431BR-ATRE1	Diodes Incorporated	±0.8%	2.5V	36V	100 mA	-40°C to 125°C	1 mA	Active	SOT-89-3
TL431ACPK	Texas Instruments	±1%	2.495V	36V	100 mA	0°C to 70°C	600 µA	Active	SOT-89-3
TL431ACPKG3	Texas Instruments	±1%	2.495V	36V	100 mA	0°C to 70°C	600 µA	Obsolete	SOT-89-3
TL431AIPK	Texas Instruments	±1%	2.495V	36V	100 mA	-40°C to 85°C	700 µA	Active	SOT-89-3
TL431AIPKG3	Texas Instruments	±1%	2.495V	36V	100 mA	-40°C to 85°C	700 µA	Obsolete	SOT-89-3
TL431AQPK	Texas Instruments	±1%	2.495V	36V	100 mA	-40°C to 125°C	700 µA	Active	SOT-89-3
TL431AQPKG3	Texas Instruments	±1%	2.495V	36V	100 mA	-40°C to 125°C	700 µA	Obsolete	SOT-89-3
TL431BCPK	Texas Instruments	±0.5%	2.495V	36V	100 mA	0°C to 70°C	600 µA	Active	SOT-89-3
TL431BCPKG3	Texas Instruments	±0.5%	2.495V	36V	100 mA	0°C to 70°C	600 µA	Obsolete	SOT-89-3

Engineering Selection Recommendations

Direct Equivalents (Active Status, ±0.5% Tolerance): TL431BCPK from Texas Instruments provides matching tolerance and electrical specifications. This part is in active production status and maintains ROHS3 compliance. Temperature range is limited to 0°C to 70°C, which is narrower than the LM431SCCMLX.

Higher Accuracy Alternative (±0.4% Tolerance): AZ431AR-ATRE1 from Diodes Incorporated offers superior tolerance at ±0.4% with extended operating temperature range (-40°C to 125°C) and active production status. This part is suitable for applications requiring tighter voltage regulation accuracy.

Standard Tolerance Alternatives (±1% Tolerance): TL431AIPK and TL431AQPK from Texas Instruments provide ±1% tolerance with active production status. TL431AIPK operates from -40°C to 85°C, while TL431AQPK extends to -40°C to 125°C. Both are suitable for general-purpose voltage reference applications where ±1% accuracy is acceptable.

Obsolete Parts: TL431ACPKG3, TL431AIPKG3, TL431AQPKG3, and TL431BCPKG3 are marked as obsolete and should not be selected for new designs. Existing inventory may be available but long-term supply is not guaranteed.

Packaging Consideration: All substitute parts use SOT-89-3 packaging and are surface mount compatible. Cut Tape (CT) and Tape & Reel (TR) packaging options are available across manufacturers; selection depends on procurement volume and assembly requirements.

Frequently Asked Questions (FAQ)

Q: Can AZ431BR-ATRE1 with ±0.8% tolerance replace the LM431SCCMLX? A: Yes. The AZ431BR-ATRE1 is functionally compatible as a shunt voltage reference with matching output current (100 mA) and voltage range (2.5V to 36V). The ±0.8% tolerance is wider than the LM431SCCMLX (±0.5%), making it suitable for applications where tighter tolerance is not required. Extended temperature range (-40°C to 125°C) provides additional operational flexibility.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging? A: Cut Tape packaging is supplied on individual tape strips suitable for lower-volume orders and manual assembly. Tape & Reel packaging is supplied on continuous reels optimized for automated pick-and-place assembly. Both formats contain identical components; selection is based on assembly process and order quantity.

Q: Are obsolete parts suitable for new product designs? A: No. Obsolete parts such as TL431ACPKG3, TL431AIPKG3, TL431AQPKG3, and TL431BCPKG3 should not be used in new designs. Manufacturers discontinue production of obsolete parts, creating supply chain risk and potential long-term availability issues. Active status parts are recommended for all new designs.

Q: How do cathode current variations affect substitution? A: Cathode current specifications (600 µA, 700 µA, or 1 mA) represent the minimum bias current required for proper device operation. These variations do not prevent substitution; circuit design must accommodate the specified cathode current range. Verify that the application circuit can supply the required cathode current for the selected substitute part.

Q: Is the LM431SCCMLX compatible with the TL431AQPK in terms of temperature range? A: The LM431SCCMLX operates from -25°C to 85°C, while TL431AQPK operates from -40°C to 125°C. The TL431AQPK provides extended temperature coverage and is compatible for all applications within the -25°C to 85°C window. For applications requiring operation below -25°C or above 85°C, the TL431AQPK offers additional margin.

Q: What is the significance of the 2.495V versus 2.5V minimum output voltage specification? A: Both specifications represent the adjustable reference voltage range. The 2.495V specification (LM431SCCMLX, TL431 series) and 2.5V specification (AZ431 series) are functionally equivalent for adjustable shunt reference applications. The difference reflects manufacturer design specifications and does not affect substitution compatibility.

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