KA431ZTA Equivalent & Substitute Parts

Part Overview

The KA431ZTA is a shunt voltage reference IC manufactured by onsemi, designed for adjustable voltage regulation applications. This component provides a fixed 2.5V reference output with ±2% tolerance and supports output voltages up to 36V at 100 mA. The KA431ZTA is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain compatibility across electrical specifications, mechanical packaging, and thermal operating ranges.

Key Parameters

Parameter	Value
Manufacturer Part Number	KA431ZTA
Manufacturer	onsemi
Category	Power Management (PMIC)
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.5V
Voltage - Output (Max)	36V
Current - Output	100 mA
Tolerance	±2%
Temperature Coefficient	50 ppm/°C Typical
Current - Cathode	1 mA
Operating Temperature	-25°C ~ 85°C
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the KA431ZTA is determined by the following critical parameters:

Reference Type & Output Type: All substitutes must be shunt voltage reference ICs with adjustable output
Voltage Range: Output voltage range must encompass or match the 2.5V minimum and 36V maximum
Current Rating: Output current capability must be 100 mA or greater
Tolerance: Substitutes with equal or tighter tolerance (±2% or better) are direct replacements
Temperature Coefficient: 50 ppm/°C typical is the baseline specification
Cathode Current: 1 mA minimum operating current requirement
Package Compatibility: TO-92-3 (TO-226AA) formed leads for through-hole mounting
Temperature Range: Operating temperature must cover the -25°C to 85°C range or be suitable for the application's thermal requirements

Substitute parts are grouped by tolerance grade (±2%, ±1%, ±0.4%) and product status (Active, Obsolete). Parts with tighter tolerance specifications provide improved accuracy but remain functionally compatible. Active product status substitutes are preferred for new designs.

Parameter Comparison

Parameter	KA431ZTA	TL431ACLPRAG	TL431AILPRAG	TL431AILPRPG	TL431BCLPRAG	TL431BCLPRMG	TL431BILPRAG	TL431BVLPRAG	TL431CLPRAG	TL431CLPRPG	TL431ILPRAG
Voltage - Output (Min/Fixed)	2.5V	2.495V	2.495V	2.495V	2.495V	2.495V	2.495V	2.495V	2.495V	2.495V	2.495V
Voltage - Output (Max)	36V	36V	36V	36V	36V	36V	36V	36V	36V	36V	36V
Current - Output	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA
Tolerance	±2%	±1%	±1%	±1%	±0.4%	±0.4%	±0.4%	±0.4%	±2.2%	±2.2%	±2.2%
Temperature Coefficient	50 ppm/°C	50 ppm/°C	50 ppm/°C	50 ppm/°C	50 ppm/°C	50 ppm/°C	50 ppm/°C	50 ppm/°C	50 ppm/°C	50 ppm/°C	50 ppm/°C
Current - Cathode	1 mA	1 mA	1 mA	1 mA	1 mA	1 mA	1 mA	1 mA	1 mA	1 mA	1 mA
Operating Temperature	-25°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 125°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C
Package / Case	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3 Long Body	TO-226-3, TO-92-3 Long Body	TO-226-3, TO-92-3 Long Body	TO-226-3, TO-92-3
Product Status	Obsolete	Active	Active	Obsolete	Active	Obsolete	Active	Obsolete	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Active Product Status (Preferred for New Designs):

TL431ACLPRAG, TL431AILPRAG, TL431BCLPRAG, TL431BILPRAG, TL431CLPRAG, TL431CLPRPG, and TL431ILPRAG are all active products suitable for new designs. These parts maintain full electrical compatibility with the KA431ZTA while offering ROHS3 compliance and improved tolerance specifications.

Temperature Range Considerations:

TL431AILPRAG, TL431AILPRPG, TL431BILPRAG, and TL431ILPRAG support -40°C to 85°C, matching or exceeding the KA431ZTA's lower temperature limit
TL431BVLPRAG extends to -40°C to 125°C for high-temperature applications
TL431ACLPRAG, TL431BCLPRAG, TL431BCLPRMG, TL431CLPRAG, and TL431CLPRPG operate 0°C to 70°C, suitable for standard industrial applications

Tolerance Grade Selection:

±1% tolerance (TL431ACLPRAG, TL431AILPRAG, TL431AILPRPG) provides improved accuracy over the original ±2%
±0.4% tolerance (TL431BCLPRAG, TL431BCLPRMG, TL431BILPRAG, TL431BVLPRAG) offers precision regulation for demanding applications
±2.2% tolerance (TL431CLPRAG, TL431CLPRPG, TL431ILPRAG) closely matches the original specification

Compliance & Certification:

All active substitute parts carry ROHS3 compliance certification, meeting modern environmental and regulatory requirements. The KA431ZTA lacks specified RoHS status, making compliant substitutes necessary for applications subject to RoHS directives.

Frequently Asked Questions (FAQ)

Q: Can I directly replace KA431ZTA with any TL431 variant?

A: Direct replacement requires matching the electrical specifications (voltage range, current rating, tolerance) and operating temperature range. All listed substitutes maintain the 2.5V to 36V output range and 100 mA current capability. Verify the operating temperature range of your application against the substitute part's specifications.

Q: What is the difference between tolerance grades (±2%, ±1%, ±0.4%)?

A: Tolerance specifies the accuracy of the reference voltage output. ±2% means the output can vary by up to 2% from the nominal 2.495V value. Tighter tolerances (±1%, ±0.4%) provide more stable and accurate reference voltages, beneficial for precision analog circuits. All grades are electrically compatible; selection depends on circuit accuracy requirements.

Q: Why do some substitutes have different operating temperature ranges?

A: Temperature range defines the ambient conditions under which the part operates within specification. The KA431ZTA operates -25°C to 85°C. Substitutes with narrower ranges (0°C to 70°C) are suitable for standard industrial environments. Wider ranges (-40°C to 85°C or -40°C to 125°C) support extended temperature applications. Select based on your system's thermal environment.

Q: Are all substitutes available in the same package?

A: All listed substitutes use TO-92-3 (TO-226AA) formed leads for through-hole mounting, matching the KA431ZTA package. Some variants specify "Long Body" packaging, which maintains electrical compatibility while offering slightly different physical dimensions. Verify PCB layout compatibility if space is constrained.

Q: What does "Product Status: Active" mean for substitution?

A: Active status indicates the part is currently manufactured and available from distributors. Obsolete parts may have limited availability and are not recommended for new designs. For production continuity, prioritize active substitutes: TL431ACLPRAG, TL431AILPRAG, TL431BCLPRAG, TL431BILPRAG, TL431CLPRAG, TL431CLPRPG, and TL431ILPRAG.

Q: Is ROHS3 compliance important for my application?

A: ROHS3 compliance is mandatory for products sold in the European Union and many other markets. All active substitute parts carry ROHS3 certification. If your application requires RoHS compliance, select only active-status substitutes. The original KA431ZTA does not specify RoHS status, making compliant substitutes necessary for regulated markets.

Q: Can I use a substitute with tighter tolerance in place of the KA431ZTA?

A: Yes. A substitute with ±1% or ±0.4% tolerance is fully compatible with circuits designed for ±2% tolerance. The tighter tolerance provides improved performance without requiring circuit modifications. This is a direct upgrade path for enhanced accuracy.

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