KA431SAMF2TF Equivalent & Substitute Parts

Part Overview

The KA431SAMF2TF is an adjustable shunt voltage reference IC manufactured by onsemi, designed for precision voltage regulation applications. This component operates with an adjustable output range of 2.495V to 36V, delivering up to 100 mA output current with ±1% tolerance. The device is packaged in SOT-23-3 flat leads format and is currently in active production status. Alternative equivalent and substitute parts are identified to support design flexibility, supply chain continuity, and application-specific performance requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	KA431SAMF2TF
Manufacturer	onsemi
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
Product Status	Active
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the KA431SAMF2TF is determined by the following critical parameters:

Primary Substitution Criteria:

Reference Type: Shunt
Output Type: Adjustable
Voltage - Output (Max): 36V minimum
Current - Output: 100 mA minimum
Package / Case: SOT-23-3 compatible
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Secondary Compatibility Factors:

Tolerance: ±1% or better
Operating Temperature Range: Must encompass -25°C to 85°C minimum
Current - Cathode: 1 mA or lower acceptable
Moisture Sensitivity Level: MSL 1 or MSL 3 acceptable

Substitute parts are grouped into three categories based on parametric alignment:

Parametric Equivalents (KA431SAMFTF, LM431SBCMFX): Identical electrical specifications and packaging, differing only in distribution format (Cut Tape vs. Tape & Reel).

Direct Substitutes (TL432AIDBZR): Meet all critical electrical parameters with minor variations in cathode current and temperature coefficient, maintaining full functional compatibility.

Similar Substitutes (AS431 and ATL432 series): Meet core voltage and current specifications with enhanced tolerance (±0.5%), extended temperature ranges, or optimized cathode current characteristics, suitable for applications with relaxed performance requirements or enhanced environmental specifications.

Parameter Comparison

Part Number	Manufacturer	Tolerance	Voltage Output (Min/Max)	Current Output	Current Cathode	Temp Coefficient	Operating Temp	Package	MSL
KA431SAMF2TF	onsemi	±1%	2.495V / 36V	100 mA	1 mA	50ppm/°C	-25°C ~ 85°C	SOT-23-3	1
KA431SAMFTF	onsemi	±1%	2.495V / 36V	100 mA	1 mA	50ppm/°C	-25°C ~ 85°C	SOT-23-3	1
LM431SBCMFX	onsemi	±1%	2.495V / 36V	100 mA	1 mA	50ppm/°C	-25°C ~ 85°C	SOT-23-3	1
TL432AIDBZR	Texas Instruments	±1%	2.495V / 36V	100 mA	700 µA	—	-40°C ~ 85°C	SOT-23-3	1
AS431ANTR-E1	Diodes Incorporated	±0.5%	2.5V / 36V	100 mA	1 mA	20ppm/°C	-40°C ~ 125°C	SOT-23-3	3
AS431ANTR-G1	Diodes Incorporated	±0.5%	2.5V / 36V	100 mA	1 mA	20ppm/°C	-40°C ~ 125°C	SOT-23-3	3
AS431BNTR-G1	Diodes Incorporated	±1%	2.5V / 36V	100 mA	1 mA	20ppm/°C	-40°C ~ 125°C	SOT-23-3	3
AS431IANTR-G1	Diodes Incorporated	±0.5%	2.5V / 36V	100 mA	50 µA	—	-40°C ~ 125°C	SOT-23-3	3
AS431IBNTR-G1	Diodes Incorporated	±1%	2.5V / 36V	100 mA	50 µA	—	-40°C ~ 125°C	SOT-23-3	3
ATL432AIDBZR	Texas Instruments	±1%	2.5V / 36V	100 mA	35 µA	48ppm/°C	-40°C ~ 85°C	SOT-23-3	1
ATL432AQDBZR	Texas Instruments	±1%	2.5V / 36V	100 mA	35 µA	82ppm/°C	-40°C ~ 125°C	SOT-23-3	1

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): KA431SAMFTF and LM431SBCMFX are parametric equivalents to KA431SAMF2TF. Both maintain identical electrical performance and are ROHS3 compliant with MSL 1 rating. Selection between these options depends on packaging format availability (Cut Tape vs. Tape & Reel) and inventory requirements.

For Cross-Manufacturer Substitution (Texas Instruments): TL432AIDBZR provides functional equivalence with ±1% tolerance and 100 mA output capability. The reduced cathode current (700 µA vs. 1 mA) and extended lower operating temperature limit (-40°C) offer enhanced performance margins for certain applications. This part is ROHS3 compliant with MSL 1 rating.

ATL432AIDBZR and ATL432AQDBZR offer optimized cathode current characteristics (35 µA) with comparable tolerance and output specifications. ATL432AQDBZR extends the operating temperature range to 125°C, suitable for elevated ambient applications. Both maintain ROHS3 compliance and MSL 1 rating.

For Enhanced Tolerance Applications (Diodes Incorporated): AS431ANTR-E1 and AS431ANTR-G1 deliver ±0.5% tolerance with improved temperature coefficient (20ppm/°C) and extended operating range (-40°C to 125°C). These parts are suitable for precision reference applications requiring tighter voltage accuracy. MSL 3 rating requires standard moisture control during storage and handling.

AS431BNTR-G1 maintains ±1% tolerance with the same enhanced temperature range and improved temperature coefficient. AS431IANTR-G1 and AS431IBNTR-G1 feature ultra-low cathode current (50 µA), reducing quiescent power consumption in battery-powered or low-power applications.

Compliance and Regulatory Status: All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the primary part. MSL ratings vary between 1 (unlimited) and 3 (168 hours), affecting storage and handling requirements but not functional performance.

Frequently Asked Questions (FAQ)

Q: Can KA431SAMF2TF be directly replaced with KA431SAMFTF? A: Yes. KA431SAMFTF is a parametric equivalent with identical electrical specifications. The only difference is packaging format: KA431SAMFTF is supplied in Cut Tape & Digi-Reel format, while KA431SAMF2TF is supplied in Tape & Reel format. Both are suitable for automated assembly.

Q: What is the difference between onsemi KA431 and Texas Instruments TL432 series? A: Both are adjustable shunt voltage references meeting the same core specifications (2.495V to 36V output, 100 mA, ±1% tolerance). Differences include cathode current (TL432AIDBZR: 700 µA vs. KA431: 1 mA) and operating temperature range (TL432AIDBZR: -40°C to 85°C vs. KA431: -25°C to 85°C). Functional compatibility is maintained for standard applications.

Q: Are Diodes Incorporated AS431 parts compatible with onsemi KA431? A: AS431 parts are functionally compatible with KA431 in adjustable shunt reference applications. Key differences include enhanced tolerance (±0.5% vs. ±1%), improved temperature coefficient (20ppm/°C vs. 50ppm/°C), and extended operating temperature range (-40°C to 125°C vs. -25°C to 85°C). AS431 parts are suitable as upgrades for precision applications.

Q: What does MSL 1 vs. MSL 3 mean for component handling? A: MSL 1 (Unlimited) indicates the component has unlimited shelf life under standard conditions without moisture bake-out requirements. MSL 3 (168 hours) requires moisture control during storage; components must be baked out if exposed to humidity for extended periods. Both ratings are acceptable for standard manufacturing environments with proper moisture management.

Q: Can I use ATL432AQDBZR in place of KA431SAMF2TF for high-temperature applications? A: Yes. ATL432AQDBZR extends the operating temperature range to 125°C (vs. 85°C for KA431SAMF2TF) while maintaining ±1% tolerance and 100 mA output capability. The reduced cathode current (35 µA vs. 1 mA) provides additional design flexibility. This substitution is suitable for applications requiring elevated ambient temperature operation.

Q: What is the significance of cathode current differences between substitute parts? A: Cathode current affects quiescent power consumption and circuit biasing requirements. Lower cathode current (35 µA to 50 µA) reduces power dissipation, beneficial for battery-powered applications. Higher cathode current (700 µA to 1 mA) may require different biasing resistor values in the reference circuit. Circuit redesign may be necessary for optimal performance with parts having significantly different cathode current specifications.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the primary KA431SAMF2TF part. This ensures compatibility with environmental and regulatory requirements across all listed alternatives.

Q: Which substitute part offers the best temperature stability? A: AS431ANTR-E1 and AS431ANTR-G1 offer the lowest temperature coefficient (20ppm/°C) compared to KA431SAMF2TF (50ppm/°C), providing superior temperature stability. These parts are recommended for precision reference applications where temperature-induced voltage drift must be minimized.

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