KA431SLMFTF Equivalent & Substitute Parts

Part Overview

The KA431SLMFTF is an adjustable shunt voltage reference IC manufactured by onsemi, designed for precision voltage regulation and reference applications. This SOT-23F-3 surface mount device delivers 2.495V output with ±0.5% tolerance and supports up to 100 mA output current across a 36V maximum input range. The component is ROHS3 compliant and maintains active product status with unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when design requirements necessitate alternative packaging formats, extended temperature ranges, different output current specifications, or alternative manufacturer sourcing while maintaining core electrical functionality.

Key Parameters

Parameter	KA431SLMFTF
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	36V
Current - Output	100 mA
Tolerance	±0.5%
Temperature Coefficient	50ppm/°C Typical
Current - Cathode	1 mA
Operating Temperature	-25°C ~ 85°C
Package / Case	SOT-23-3 Flat Leads
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution relationships are established based on the following electrical and mechanical criteria:

Upgrade Substitutes (NCP432BISNT1G, NCP432BVSNT1G): These parts maintain adjustable output type, ±0.5% tolerance, and 36V maximum rating. Key differences include reduced output current (40 µA vs. 100 mA) and extended cathode current (100 mA vs. 1 mA). NCP432BVSNT1G extends operating temperature to -40°C ~ 125°C. Packaging transitions from Cut Tape to Tape & Reel format.

Similar Substitutes (NCP432BCSNT1G, AN431AN-ATRE1, AN431AN-ATRG1, AN431BN-ATRE1, AN431BN-ATRG1): These maintain shunt reference architecture with adjustable output and 36V maximum rating. Output voltage shifts to 2.5V nominal. AN431 series (Diodes Incorporated) offers improved temperature coefficient (20ppm/°C vs. 50ppm/°C) and extended operating ranges to -40°C ~ 125°C. AN431BN variants specify ±1% tolerance. Packaging options include both Tape & Reel and Cut Tape formats.

Parametric Equivalents (KA431SLMF2TF, LM431SCCMFX): These maintain identical electrical specifications to the main part (2.495V output, 100 mA, ±0.5%, 50ppm/°C). KA431SLMF2TF is an onsemi variant in Cut Tape packaging. LM431SCCMFX is an onsemi part in Tape & Reel format with significantly higher inventory (324,100 pcs).

Direct Substitute (TL431BIDBZR): Texas Instruments equivalent with matching 2.495V output, 100 mA current, and ±0.5% tolerance. Cathode current differs at 700 µA. Operating temperature extends to -40°C ~ 85°C. Package transitions to standard SOT-23-3 (non-flat leads).

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Tolerance	Temp Coefficient	Operating Temp	Package	Packaging Format
KA431SLMFTF	onsemi	2.495V	100 mA	±0.5%	50ppm/°C	-25°C ~ 85°C	SOT-23-3 Flat Leads	Cut Tape
NCP432BISNT1G	onsemi	2.5V	40 µA	±0.5%	50ppm/°C	-40°C ~ 85°C	SOT-23-3	Tape & Reel
NCP432BVSNT1G	onsemi	2.5V	40 µA	±0.5%	50ppm/°C	-40°C ~ 125°C	SOT-23-3	Tape & Reel
NCP432BCSNT1G	onsemi	2.5V	40 µA	±0.5%	50ppm/°C	0°C ~ 70°C	SOT-23-3	Tape & Reel
KA431SLMF2TF	onsemi	2.495V	100 mA	±0.5%	50ppm/°C	-25°C ~ 85°C	SOT-23-3 Flat Leads	Cut Tape
LM431SCCMFX	onsemi	2.495V	100 mA	±0.5%	50ppm/°C	-25°C ~ 85°C	SOT-23-3 Flat Leads	Tape & Reel
TL431BIDBZR	Texas Instruments	2.495V	100 mA	±0.5%	Not specified	-40°C ~ 85°C	SOT-23-3	Cut Tape
AN431AN-ATRE1	Diodes Incorporated	2.5V	100 mA	±0.5%	20ppm/°C	-40°C ~ 125°C	SOT-23-3	Tape & Reel
AN431AN-ATRG1	Diodes Incorporated	2.5V	100 mA	±0.5%	20ppm/°C	-40°C ~ 125°C	SOT-23-3	Cut Tape
AN431BN-ATRE1	Diodes Incorporated	2.5V	100 mA	±1%	20ppm/°C	-40°C ~ 125°C	SOT-23-3	Tape & Reel
AN431BN-ATRG1	Diodes Incorporated	2.5V	100 mA	±1%	20ppm/°C	-40°C ~ 125°C	SOT-23-3	Cut Tape

Engineering Selection Recommendations

For Direct Replacement (Same Specifications): KA431SLMF2TF and LM431SCCMFX maintain identical electrical performance to KA431SLMFTF. LM431SCCMFX offers significantly higher inventory availability (324,100 pcs) and Tape & Reel packaging for automated assembly. Both are ROHS3 compliant with MSL 1 rating.

For Extended Temperature Range: NCP432BVSNT1G extends operating temperature to -40°C ~ 125°C while maintaining ±0.5% tolerance and ROHS3 compliance. This variant is suitable for industrial and automotive applications requiring wider temperature operation. Output current specification differs at 40 µA.

For Improved Temperature Stability: AN431AN-ATRE1 and AN431AN-ATRG1 (Diodes Incorporated) provide superior temperature coefficient (20ppm/°C vs. 50ppm/°C) with extended operating range to -40°C ~ 125°C. These maintain 100 mA output current and ±0.5% tolerance. Both are ROHS3 compliant.

For Cost-Optimized Selection with Relaxed Tolerance: AN431BN-ATRE1 and AN431BN-ATRG1 specify ±1% tolerance (vs. ±0.5%) while maintaining 100 mA output current and extended temperature range. These are suitable for applications where tighter tolerance is not critical.

For Alternative Manufacturer Sourcing: TL431BIDBZR (Texas Instruments) provides equivalent electrical performance with matching 2.495V output and 100 mA current. Extended operating temperature to -40°C ~ 85°C supports broader application ranges. ROHS3 compliant.

All recommended substitutes maintain ROHS3 compliance, REACH unaffected status, and EAR99 export classification consistent with the main part.

Frequently Asked Questions (FAQ)

Q: Can NCP432BISNT1G or NCP432BVSNT1G replace KA431SLMFTF directly?

A: These parts are functionally compatible as adjustable shunt voltage references with matching 36V maximum rating and ±0.5% tolerance. However, output current differs significantly (40 µA vs. 100 mA). Selection depends on circuit current requirements. NCP432BVSNT1G extends operating temperature to -40°C ~ 125°C, making it suitable for wider temperature applications.

Q: What is the difference between AN431AN and AN431BN variants?

A: AN431AN variants specify ±0.5% tolerance, while AN431BN variants specify ±1% tolerance. Both maintain 100 mA output current, 2.5V nominal output, and extended operating range to -40°C ~ 125°C. Selection depends on tolerance requirements for the application.

Q: Does packaging format affect electrical performance?

A: No. Cut Tape (CT) and Tape & Reel (TR) formats are packaging and delivery methods only. Electrical specifications remain identical. Selection is based on assembly process requirements: Cut Tape for manual or low-volume assembly, Tape & Reel for automated high-volume production.

Q: Why does LM431SCCMFX have higher inventory than KA431SLMFTF?

A: LM431SCCMFX is supplied in Tape & Reel format, which is standard for high-volume automated manufacturing. This format typically maintains higher stock levels. Both parts are electrically identical with matching specifications.

Q: Can TL431BIDBZR be used as a drop-in replacement?

A: TL431BIDBZR is electrically compatible with matching 2.495V output, 100 mA current, and ±0.5% tolerance. Package type is SOT-23-3 (non-flat leads) versus SOT-23-3 Flat Leads on the main part. Physical footprint compatibility should be verified for PCB layout. Cathode current differs at 700 µA versus 1 mA.

Q: Which substitute offers the best temperature stability?

A: AN431AN-ATRE1 and AN431AN-ATRG1 provide superior temperature coefficient at 20ppm/°C compared to 50ppm/°C on the main part and most other substitutes. These are recommended for precision applications requiring minimal temperature-induced drift.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitutes maintain ROHS3 compliance and REACH unaffected status, consistent with the main part KA431SLMFTF.

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