LM431SBCMFX-G Equivalent & Substitute Parts

Part Overview

The LM431SBCMFX-G is a shunt voltage reference IC with adjustable output, manufactured by onsemi. This component functions as a precision voltage reference in power management applications, offering an adjustable output range from 2.495V to 36V with ±1% tolerance. The main part is currently obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. Active alternatives with identical electrical and mechanical specifications are available from the same manufacturer.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	36V
Current - Output	100 mA
Tolerance	±1%
Temperature Coefficient	50ppm/°C Typical
Current - Cathode	1 mA
Operating Temperature	-25°C ~ 85°C (TA)
Package / Case	SOT-23-3 Flat Leads
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the LM431SBCMFX-G is determined by strict equivalence across the following parameters:

Reference Type: Shunt
Output Type: Adjustable
Voltage - Output (Min/Fixed): 2.495V
Voltage - Output (Max): 36V
Current - Output: 100 mA
Tolerance: ±1%
Temperature Coefficient: 50ppm/°C Typical
Current - Cathode: 1 mA
Operating Temperature: -25°C ~ 85°C (TA)
Package / Case: SOT-23-3 Flat Leads
Mounting Type: Surface Mount

All identified substitute parts meet these criteria without deviation. Substitution is valid across different packaging formats (Tape & Reel, Cut Tape & Digi-Reel) and between the LM431 and KA431 base product numbers, as both maintain identical electrical specifications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Output (Min/Max)	Current Output	Tolerance	Temperature Coefficient	Package	Packaging Format	RoHS Status
LM431SBCMFX-G	onsemi	Obsolete	2.495V / 36V	100 mA	±1%	50ppm/°C	SOT-23-3	Not specified	Not specified
KA431SAMF2TF	onsemi	Active	2.495V / 36V	100 mA	±1%	50ppm/°C	SOT-23-3	Tape & Reel (TR)	ROHS3 Compliant
KA431SAMFTF	onsemi	Active	2.495V / 36V	100 mA	±1%	50ppm/°C	SOT-23-3	Cut Tape (CT) & Digi-Reel®	ROHS3 Compliant
LM431SBCMFX	onsemi	Active	2.495V / 36V	100 mA	±1%	50ppm/°C	SOT-23-3	Tape & Reel (TR)	ROHS3 Compliant

Engineering Selection Recommendations

All three substitute parts are direct parametric equivalents to the LM431SBCMFX-G. Selection should be based on the following factors:

Product Status: The main part is obsolete. All substitute parts are active and currently in production, ensuring long-term availability and supply chain continuity.

Compliance: KA431SAMF2TF, KA431SAMFTF, and LM431SBCMFX are all ROHS3 compliant, meeting modern environmental and regulatory requirements. The original part does not specify RoHS status.

Packaging Format: Choose based on procurement requirements:

LM431SBCMFX: Tape & Reel (TR) format, 329,200 units in stock
KA431SAMF2TF: Tape & Reel (TR) format, 194,100 units in stock
KA431SAMFTF: Cut Tape (CT) & Digi-Reel® format, 40,015 units in stock

Inventory Availability: LM431SBCMFX offers the highest stock level, followed by KA431SAMF2TF. Both are suitable for high-volume applications.

Frequently Asked Questions (FAQ)

Q: Can KA431SAMF2TF replace LM431SBCMFX-G directly? A: Yes. Both parts are shunt voltage references with identical electrical specifications: 2.495V to 36V adjustable output, 100 mA output current, ±1% tolerance, and 50ppm/°C temperature coefficient. The SOT-23-3 package is mechanically and electrically compatible.

Q: What is the difference between LM431 and KA431 base product numbers? A: Both are onsemi shunt voltage reference ICs with identical electrical and mechanical specifications. The difference lies in product line designation. Both are suitable for direct substitution when all other parameters match.

Q: Does packaging format affect electrical performance? A: No. Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® formats contain the same die and deliver identical electrical performance. Format selection is based on procurement and assembly process requirements only.

Q: Is the original LM431SBCMFX-G still available? A: The original part (LM431SBCMFX-G) is obsolete. However, LM431SBCMFX (without the -G suffix) is active and available in Tape & Reel format with 329,200 units in stock.

Q: Are all substitute parts RoHS3 compliant? A: Yes. KA431SAMF2TF, KA431SAMFTF, and LM431SBCMFX are all ROHS3 compliant. The original part does not specify RoHS status.

Q: What is the operating temperature range? A: All parts operate from -25°C to 85°C (TA), ensuring compatibility across standard industrial and commercial temperature ranges.

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