KA431ADTF Equivalent & Substitute Parts

Part Overview

The KA431ADTF is a shunt voltage reference IC manufactured by onsemi, designed for adjustable voltage regulation applications. This component features an adjustable output range from 2.495V to 36V with ±1% tolerance and 100mA output capability in an 8-SOIC surface mount package. The KA431ADTF is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Active alternatives with identical or improved electrical characteristics 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	100mA
Tolerance	±1%
Temperature Coefficient	50ppm/°C Typical
Current - Cathode	1mA
Operating Temperature	-25°C ~ 85°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the KA431ADTF is determined by strict equivalence in the following electrical and mechanical parameters:

Reference Type: Shunt
Output Type: Adjustable
Voltage Output Range: 2.495V to 36V
Current Output: 100mA
Package: 8-SOIC surface mount
Compliance: ROHS3, REACH Unaffected

Substitute parts are grouped into two categories:

Direct Substitutes (Functionally Identical): Parts with matching tolerance (±1%), identical electrical specifications, and active product status. These provide pin-for-pin compatibility with equivalent performance.

Similar Substitutes (Enhanced or Alternative Specifications): Parts with improved tolerance (±0.4%), extended temperature ranges, or automotive qualification (AEC-Q100). These offer superior performance characteristics while maintaining electrical and mechanical compatibility.

Parameter Comparison

Part Number	Manufacturer	Status	Tolerance	Temp Range	Package	Output (Min/Max)	Current Output
KA431ADTF	onsemi	Obsolete	±1%	-25°C ~ 85°C	8-SOIC CT	2.495V / 36V	100mA
TL431AIDR2G	onsemi	Active	±1%	-40°C ~ 85°C	8-SOIC TR	2.495V / 36V	100mA
TL431AIDG	onsemi	Active	±1%	-40°C ~ 85°C	8-SOIC Tube	2.495V / 36V	100mA
NCV431BVDR2G	onsemi	Active	±0.4%	-40°C ~ 125°C	8-SOIC TR	2.495V / 36V	100mA
TL431ACDG	onsemi	Active	±1%	0°C ~ 70°C	8-SOIC Tube	2.495V / 36V	100mA
TL431ACDR2G	onsemi	Active	±1%	0°C ~ 70°C	8-SOIC TR	2.495V / 36V	100mA
TL431BCDR2G	onsemi	Active	±0.4%	0°C ~ 70°C	8-SOIC TR	2.495V / 36V	100mA
TL431BIDG	onsemi	Active	±0.4%	-40°C ~ 85°C	8-SOIC Tube	2.495V / 36V	100mA
TL431BIDR2G	onsemi	Active	±0.4%	-40°C ~ 85°C	8-SOIC TR	2.495V / 36V	100mA
TL431BVDR2G	onsemi	Active	±0.4%	-40°C ~ 125°C	8-SOIC TR	2.495V / 36V	100mA
TL431CDR2G	onsemi	Active	±2.2%	0°C ~ 70°C	8-SOIC TR	2.495V / 36V	100mA

Engineering Selection Recommendations

For Direct Replacement (Obsolete to Active): TL431AIDR2G and TL431AIDG are the primary direct substitutes for KA431ADTF. Both maintain ±1% tolerance and 100mA output capability. TL431AIDR2G is supplied in Tape & Reel packaging with extended temperature range (-40°C ~ 85°C), while TL431AIDG is supplied in Tube packaging. Both are ROHS3 compliant and REACH unaffected, matching the compliance profile of the original part.

For Enhanced Performance: TL431BIDR2G and TL431BVDR2G offer ±0.4% tolerance with -40°C ~ 85°C and -40°C ~ 125°C operating ranges respectively. These parts provide superior accuracy and wider temperature operation while maintaining identical electrical and mechanical compatibility.

For Automotive Applications: NCV431BVDR2G is AEC-Q100 qualified with ±0.4% tolerance and -40°C ~ 125°C operating range, suitable for automotive-grade designs requiring enhanced reliability and temperature performance.

Packaging Considerations: Tape & Reel (TR) packaging is standard for high-volume production. Tube packaging is available for lower-volume applications. Cut Tape (CT) is not available in active substitute parts; transition to TR or Tube packaging is required.

Frequently Asked Questions (FAQ)

Q: Can TL431AIDR2G directly replace KA431ADTF without circuit modifications? A: Yes. TL431AIDR2G maintains identical electrical specifications (±1% tolerance, 2.495V to 36V output, 100mA current) and 8-SOIC package geometry. The extended temperature range (-40°C ~ 85°C versus -25°C ~ 85°C) provides additional operational margin without requiring design changes.

Q: What is the difference between ±1% and ±0.4% tolerance variants? A: Tolerance specifies the accuracy of the output voltage reference. ±1% tolerance (KA431ADTF, TL431AIDR2G, TL431ACDG, TL431ACDR2G) allows ±1% deviation from nominal output. ±0.4% tolerance (TL431BCDR2G, TL431BIDG, TL431BIDR2G, TL431BVDR2G, NCV431BVDR2G) provides tighter accuracy with ±0.4% deviation. Selection depends on application precision requirements.

Q: Why is TL431CDR2G listed as a substitute if it has ±2.2% tolerance? A: TL431CDR2G maintains all electrical and mechanical compatibility parameters but with relaxed tolerance specification. It is suitable only for applications where ±2.2% accuracy is acceptable. For designs requiring ±1% or better accuracy, use TL431AIDR2G, TL431AIDG, or ±0.4% variants.

Q: What packaging options are available for production? A: Active substitutes are supplied in Tape & Reel (TR) or Tube packaging. Cut Tape (CT) is not available in active parts. TR packaging is standard for automated assembly and high-volume production. Tube packaging is used for manual assembly or lower-volume applications.

Q: Is NCV431BVDR2G compatible with non-automotive applications? A: Yes. NCV431BVDR2G is AEC-Q100 qualified for automotive use but is electrically and mechanically compatible with all applications. The automotive qualification indicates enhanced reliability testing and extended temperature range (-40°C ~ 125°C), making it suitable for any application requiring superior performance.

Q: What is the temperature coefficient significance? A: All listed parts specify 50ppm/°C typical temperature coefficient. This parameter defines how the output voltage changes with temperature. The identical specification across all substitutes ensures consistent thermal performance in the application circuit.

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