LM431SACM3X Equivalent & Substitute Parts

Part Overview

The LM431SACM3X is an adjustable shunt voltage reference IC manufactured by onsemi, designed for power management applications. This Surface Mount device operates across a -25°C to 85°C temperature range and delivers 100 mA output current with ±2% tolerance. The part is Active status and RoHS3 compliant, making it suitable for modern electronic designs requiring precision voltage reference functionality in compact SOT-23-3 packaging.

Equivalent and substitute parts are identified to support design flexibility, inventory optimization, and supply chain continuity while maintaining electrical and mechanical compatibility within specified parameter ranges.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.5V
Voltage - Output (Max)	36V
Current - Output	100 mA
Tolerance	±2%
Temperature Coefficient	50ppm/°C Typical
Current - Cathode	1 mA
Operating Temperature	-25°C ~ 85°C
Package / Case	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts are classified based on electrical parameter compatibility with the LM431SACM3X. The primary substitution criteria are:

Critical Parameters (Must Match):

Reference Type: Shunt
Output Type: Adjustable
Voltage Range: 2.5V minimum to 36V maximum
Package: SOT-23-3 (TO-236-3, SC-59)
Mounting Type: Surface Mount

Flexible Parameters (Allow Variation):

Current - Output: 100 mA baseline; lower values acceptable if application permits
Tolerance: ±2% baseline; tighter tolerances (±0.5%, ±0.4%, ±1%) are acceptable substitutes
Operating Temperature: -25°C to 85°C baseline; extended ranges acceptable
Current - Cathode: 1 mA baseline; variations acceptable within application requirements
Temperature Coefficient: 50ppm/°C baseline; similar values acceptable

Substitutes are grouped into two categories: Direct Equivalents (matching all critical parameters) and Compatible Alternatives (meeting critical parameters with improved or different secondary specifications).

Parameter Comparison

Part Number	Manufacturer	Reference Type	Output Type	Voltage Min	Voltage Max	Current Output	Tolerance	Temp Range	Package	RoHS Status
LM431SACM3X	onsemi	Shunt	Adjustable	2.5V	36V	100 mA	±2%	-25°C ~ 85°C	SOT-23-3	ROHS3
LM431SACM32X	Fairchild Semiconductor	Shunt	Adjustable	2.5V	36V	100 mA	±2%	-25°C ~ 85°C	SOT-23-3	ROHS3
NCP432BCSNT1G	onsemi	Shunt	Adjustable	2.5V	36V	40 µA	±0.5%	0°C ~ 70°C	SOT-23-3	ROHS3
NCP432BISNT1G	onsemi	Shunt	Adjustable	2.5V	36V	40 µA	±0.5%	-40°C ~ 85°C	SOT-23-3	ROHS3
NCP432BVSNT1G	onsemi	Shunt	Adjustable	2.5V	36V	40 µA	±0.5%	-40°C ~ 125°C	SOT-23-3	ROHS3
AS431IANTR-G1	Diodes Incorporated	Shunt	Adjustable	2.5V	36V	100 mA	±0.5%	-40°C ~ 125°C	SOT-23-3	ROHS3
AS431IBNTR-G1	Diodes Incorporated	Shunt	Adjustable	2.5V	36V	100 mA	±1%	-40°C ~ 125°C	SOT-23-3	ROHS3
ATL432BIDBZR	Texas Instruments	Shunt	Adjustable	2.5V	36V	100 mA	±0.5%	-40°C ~ 85°C	SOT-23-3	ROHS3
AZ431AN-ATRG1	Diodes Incorporated	Shunt	Adjustable	2.5V	36V	100 mA	±0.4%	-40°C ~ 125°C	SOT-23-3	ROHS3
TL431ACDBZR	Texas Instruments	Shunt	Adjustable	2.495V	36V	100 mA	±1%	0°C ~ 70°C	SOT-23-3	ROHS3
TL431ACDBZR,215	Nexperia USA Inc.	Shunt	Adjustable	2.495V	36V	100 mA	±1%	0°C ~ 70°C	SOT-23-3	ROHS3

Engineering Selection Recommendations

Direct Parametric Equivalent: LM431SACM32X (Fairchild Semiconductor) matches all electrical and mechanical specifications of the LM431SACM3X, including 100 mA output current, ±2% tolerance, and -25°C to 85°C operating range. Both parts are Active status and ROHS3 compliant. This part provides identical functionality with alternative sourcing.

100 mA Output Current Substitutes with Enhanced Tolerance: AS431IANTR-G1, AS431IBNTR-G1, ATL432BIDBZR, and AZ431AN-ATRG1 maintain the 100 mA output current specification while offering tighter tolerance specifications (±0.5%, ±1%, ±0.4%). All are Active status and ROHS3 compliant. AS431IANTR-G1 and AZ431AN-ATRG1 extend operating temperature to -40°C to 125°C. ATL432BIDBZR operates -40°C to 85°C. TL431ACDBZR and TL431ACDBZR,215 provide ±1% tolerance with 100 mA output but operate within 0°C to 70°C range.

Lower Output Current Alternatives: NCP432BCSNT1G, NCP432BISNT1G, and NCP432BVSNT1G reduce output current to 40 µA with improved ±0.5% tolerance. These parts are suitable for applications where lower output current is acceptable. NCP432BVSNT1G extends temperature range to -40°C to 125°C. All are Active status and ROHS3 compliant.

All substitute parts maintain SOT-23-3 packaging, Surface Mount mounting type, and REACH/ECCN compliance with the original specification.

Frequently Asked Questions (FAQ)

Q: Can NCP432 series parts replace the LM431SACM3X directly? A: NCP432 series parts (NCP432BCSNT1G, NCP432BISNT1G, NCP432BVSNT1G) are electrically compatible in SOT-23-3 packaging and maintain the 2.5V to 36V output voltage range. However, they specify 40 µA output current versus the LM431SACM3X 100 mA specification. Substitution is valid only if the application circuit design permits lower output current operation.

Q: What is the difference between AS431IANTR-G1 and AS431IBNTR-G1? A: Both parts are manufactured by Diodes Incorporated in SOT-23-3 packaging with 100 mA output current and -40°C to 125°C operating range. The primary difference is tolerance specification: AS431IANTR-G1 provides ±0.5% tolerance while AS431IBNTR-G1 provides ±1% tolerance. Selection depends on application accuracy requirements.

Q: Are TL431ACDBZR and TL431ACDBZR,215 interchangeable? A: Both parts are adjustable shunt voltage references with identical electrical specifications: 2.495V minimum output, 36V maximum, 100 mA output current, ±1% tolerance, and 0°C to 70°C operating range in SOT-23-3 packaging. TL431ACDBZR is manufactured by Texas Instruments while TL431ACDBZR,215 is manufactured by Nexperia USA Inc. They are functionally equivalent with different sourcing options.

Q: Which substitute offers the widest operating temperature range? A: NCP432BVSNT1G, AS431IANTR-G1, and AZ431AN-ATRG1 all operate across -40°C to 125°C, providing the widest temperature coverage. These parts are suitable for applications requiring extended temperature performance beyond the LM431SACM3X baseline of -25°C to 85°C.

Q: Can I use AZ431AN-ATRG1 as a drop-in replacement? A: AZ431AN-ATRG1 is compatible in SOT-23-3 packaging with matching 2.5V to 36V output voltage range and 100 mA output current. It offers superior ±0.4% tolerance and extended -40°C to 125°C operating range. The part is Active status and ROHS3 compliant, making it a direct functional replacement with improved specifications.

Q: What packaging considerations apply to all listed substitutes? A: All substitute parts use SOT-23-3 (TO-236-3, SC-59) Surface Mount packaging, matching the LM431SACM3X footprint. PCB layout and reflow soldering parameters remain consistent across all listed alternatives. No mechanical redesign is required for package compatibility.

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