KA431LDTF Equivalent & Substitute Parts

Part Overview

The KA431LDTF is a shunt voltage reference IC manufactured by onsemi, designed for adjustable voltage regulation applications. This component features a 2.495V adjustable output with ±0.5% tolerance and supports output currents up to 100 mA across a 36V maximum range. The device is packaged in an 8-SOIC surface mount configuration with a 50ppm/°C typical temperature coefficient.

The KA431LDTF is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this reference voltage architecture.

Key Parameters

Parameter	Value
Manufacturer	onsemi
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
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the KA431LDTF is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Reference Type: Shunt
Output Type: Adjustable
Voltage - Output (Min/Fixed): 2.495V
Voltage - Output (Max): 36V or greater
Current - Output: 100 mA
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount

Tolerance Consideration: The KA431LDTF specifies ±0.5% tolerance. Substitute parts with equal or tighter tolerance (lower percentage values) are functionally compatible. Parts with looser tolerance (higher percentage values) may be used where application requirements permit.

Temperature Range: The KA431LDTF operates from -25°C to 85°C. Substitute parts with equal or extended operating temperature ranges are acceptable.

All identified substitute parts meet the mandatory compatibility criteria and maintain electrical equivalence within the specified parameter boundaries.

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min)	Voltage Output (Max)	Current Output	Tolerance	Temp Coefficient	Operating Temp	Product Status	Package
KA431LDTF	onsemi	2.495V	36V	100 mA	±0.5%	50ppm/°C	-25°C ~ 85°C	Obsolete	8-SOIC
LM431CCMX	Texas Instruments	2.5V	37V	100 mA	-0.6%, +0.4%	50ppm/°C	0°C ~ 70°C	Obsolete	8-SOIC
NCV431AIDR2G	onsemi	2.495V	36V	100 mA	±1%	50ppm/°C	-40°C ~ 125°C	Active	8-SOIC
TL431ACDG	onsemi	2.495V	36V	100 mA	±1%	50ppm/°C	0°C ~ 70°C	Active	8-SOIC
TL431ACDR2G	onsemi	2.495V	36V	100 mA	±1%	50ppm/°C	0°C ~ 70°C	Active	8-SOIC
TL431AIDG	onsemi	2.495V	36V	100 mA	±1%	50ppm/°C	-40°C ~ 85°C	Active	8-SOIC
TL431AIDR2G	onsemi	2.495V	36V	100 mA	±1%	50ppm/°C	-40°C ~ 85°C	Active	8-SOIC
TL431BCDR2G	onsemi	2.495V	36V	100 mA	±0.4%	50ppm/°C	0°C ~ 70°C	Active	8-SOIC
TL431BIDG	onsemi	2.495V	36V	100 mA	±0.4%	50ppm/°C	-40°C ~ 85°C	Active	8-SOIC
TL431BIDR2G	onsemi	2.495V	36V	100 mA	±0.4%	50ppm/°C	-40°C ~ 85°C	Active	8-SOIC
TL431BVDR2G	onsemi	2.495V	36V	100 mA	±0.4%	50ppm/°C	-40°C ~ 125°C	Active	8-SOIC

Engineering Selection Recommendations

Active vs. Obsolete Status: The KA431LDTF is obsolete. All listed substitute parts with Active product status (NCV431AIDR2G, TL431ACDG, TL431ACDR2G, TL431AIDG, TL431AIDR2G, TL431BCDR2G, TL431BIDG, TL431BIDR2G, TL431BVDR2G) are recommended for new designs and ongoing production to ensure long-term supply chain continuity.

Compliance and Certifications:

NCV431AIDR2G carries AEC-Q100 automotive qualification and supports extended temperature operation (-40°C ~ 125°C), suitable for automotive and industrial applications.
TL431BVDR2G provides the widest operating temperature range (-40°C ~ 125°C) among active alternatives, supporting demanding thermal environments.
All active substitute parts are RoHS3 compliant and REACH unaffected.

Tolerance Selection:

For applications requiring ±0.5% tolerance matching: LM431CCMX provides direct tolerance equivalence, though it is also obsolete.
For applications tolerating ±1% tolerance: NCV431AIDR2G, TL431ACDG, TL431ACDR2G, TL431AIDG, and TL431AIDR2G are suitable.
For applications requiring ±0.4% tolerance (tighter than original): TL431BCDR2G, TL431BIDG, TL431BIDR2G, and TL431BVDR2G provide enhanced precision.

Temperature Range Matching:

For -25°C ~ 85°C operation: TL431AIDG, TL431AIDR2G, TL431BIDG, and TL431BIDR2G maintain the original temperature envelope.
For extended low-temperature operation (-40°C): NCV431AIDR2G, TL431AIDG, TL431AIDR2G, TL431BIDG, TL431BIDR2G, and TL431BVDR2G are qualified.
For extended high-temperature operation (125°C): NCV431AIDR2G and TL431BVDR2G support this requirement.

Frequently Asked Questions (FAQ)

Q: Can I directly replace KA431LDTF with any of the listed substitute parts?

A: Direct replacement is possible only when the substitute part meets all mandatory compatibility criteria: shunt reference type, adjustable output, 2.495V minimum output, 36V maximum output, 100 mA output current, and 8-SOIC package. All listed parts satisfy these requirements. However, verify that tolerance and operating temperature specifications align with your application requirements.

Q: What is the difference between ±0.5%, ±1%, and ±0.4% tolerance?

A: Tolerance defines the maximum deviation of the output voltage from its nominal value. The KA431LDTF specifies ±0.5% tolerance. Substitute parts with ±0.4% tolerance provide tighter voltage regulation (higher precision). Parts with ±1% tolerance provide looser regulation (lower precision). Select based on your circuit's voltage regulation requirements.

Q: Why are some substitute parts obsolete while others are active?

A: Product status reflects manufacturer support and availability. Active parts are currently manufactured and supported by the supplier. Obsolete parts are no longer in production. For new designs and long-term production, select active parts to ensure supply chain reliability.

Q: Does packaging type affect substitution?

A: Yes. The KA431LDTF is specified in 8-SOIC package. All listed substitutes use the same 8-SOIC (0.154", 3.90mm Width) package, ensuring PCB footprint compatibility. Packaging variants (Tube, Tape & Reel, Cut Tape) affect handling and delivery format but not electrical or mechanical compatibility.

Q: Can I use a substitute part with a wider operating temperature range?

A: Yes. A substitute part with an extended operating temperature range (for example, -40°C ~ 125°C instead of -25°C ~ 85°C) is functionally compatible and provides additional operational margin. Verify that your application does not require the original temperature range as a design constraint.

Q: What is the significance of RoHS3 compliance?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances regulations, restricting lead and other hazardous materials. All active substitute parts listed are RoHS3 compliant, supporting environmental and regulatory requirements for modern electronics manufacturing.

Q: Are there differences between onsemi and Texas Instruments versions?

A: Both manufacturers produce functionally equivalent shunt voltage reference ICs. The LM431CCMX (Texas Instruments) and onsemi variants (TL431, NCV431 series) meet the same electrical specifications. Selection may depend on supplier availability, qualification requirements, or existing design documentation preferences.

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