KA431ZTF Equivalent & Substitute Parts

Part Overview

The KA431ZTF is an adjustable shunt voltage reference IC manufactured by onsemi, designed for power management applications requiring precision voltage regulation. This component operates across a 2.5V to 36V output range with ±2% tolerance and supports 100 mA output current in a TO-92-3 through-hole package.

The KA431ZTF is classified as obsolete. Identifying suitable substitute parts is necessary to maintain design continuity and ensure component availability for new production runs or system updates. Substitute parts must maintain electrical compatibility across critical parameters including output voltage range, current capacity, tolerance specifications, and package configuration.

Key Parameters

Parameter	KA431ZTF Value
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.5V
Voltage - Output (Max)	36V
Current - Output	100 mA
Tolerance	±2%
Temperature Coefficient	50ppm/°C Typical
Current - Cathode	1 mA
Operating Temperature	-25°C ~ 85°C
Mounting Type	Through Hole
Package / Case	TO-92-3 (TO-226AA)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the KA431ZTF is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Reference Type: Shunt (all candidates match)
Output Type: Adjustable (all candidates match)
Voltage Range: 2.495V to 36V minimum (all candidates meet or exceed)
Current - Output: 100 mA (all candidates match)
Temperature Coefficient: 50ppm/°C Typical (all candidates match)
Current - Cathode: 1 mA (all candidates match)
Package / Case: TO-92-3 or TO-92 through-hole (all candidates match)

Tolerance Variations: Substitute parts are grouped by tolerance specification, which affects circuit precision requirements:

±1% tolerance: TL431ACLPRAG, TL431AILPRAG, TL431AILPRPG
±0.4% tolerance: TL431BCLPRAG, TL431BCLPRMG, TL431BILPRAG, TL431BVLPRAG
±2.2% tolerance: TL431CLPRAG, TL431CLPRPG, TL431ILPRAG

Operating Temperature Range Variations:

0°C ~ 70°C: TL431ACLPRAG, TL431BCLPRAG, TL431BCLPRMG, TL431CLPRAG, TL431CLPRPG
-40°C ~ 85°C: TL431AILPRAG, TL431AILPRPG, TL431BILPRAG, TL431ILPRAG
-40°C ~ 125°C: TL431BVLPRAG

Product Status:

Active (current production): TL431ACLPRAG, TL431AILPRAG, TL431BCLPRAG, TL431BILPRAG, TL431CLPRAG, TL431CLPRPG, TL431ILPRAG
Obsolete: TL431AILPRPG, TL431BCLPRMG, TL431BVLPRAG

Parameter Comparison

Part Number	Tolerance	Voltage Output (Min)	Voltage Output (Max)	Current Output	Operating Temp Range	Product Status	RoHS Status
KA431ZTF	±2%	2.5V	36V	100 mA	-25°C ~ 85°C	Obsolete	Not Specified
TL431ACLPRAG	±1%	2.495V	36V	100 mA	0°C ~ 70°C	Active	ROHS3 Compliant
TL431AILPRAG	±1%	2.495V	36V	100 mA	-40°C ~ 85°C	Active	ROHS3 Compliant
TL431AILPRPG	±1%	2.495V	36V	100 mA	-40°C ~ 85°C	Obsolete	ROHS3 Compliant
TL431BCLPRAG	±0.4%	2.495V	36V	100 mA	0°C ~ 70°C	Active	ROHS3 Compliant
TL431BCLPRMG	±0.4%	2.495V	36V	100 mA	0°C ~ 70°C	Obsolete	ROHS3 Compliant
TL431BILPRAG	±0.4%	2.495V	36V	100 mA	-40°C ~ 85°C	Active	ROHS3 Compliant
TL431BVLPRAG	±0.4%	2.495V	36V	100 mA	-40°C ~ 125°C	Obsolete	ROHS3 Compliant
TL431CLPRAG	±2.2%	2.495V	36V	100 mA	0°C ~ 70°C	Active	ROHS3 Compliant
TL431CLPRPG	±2.2%	2.495V	36V	100 mA	0°C ~ 70°C	Active	ROHS3 Compliant
TL431ILPRAG	±2.2%	2.495V	36V	100 mA	-40°C ~ 85°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Active Product Status):

For applications requiring tolerance specifications matching or exceeding the KA431ZTF ±2% tolerance within the 0°C to 70°C operating range, TL431CLPRAG and TL431CLPRPG are direct functional equivalents with active production status and ROHS3 compliance.

For applications requiring extended operating temperature coverage to -40°C to 85°C, TL431ILPRAG provides ±2.2% tolerance with active product status and ROHS3 compliance.

For applications requiring improved tolerance performance, TL431AILPRAG offers ±1% tolerance across -40°C to 85°C operating range with active production status and ROHS3 compliance.

For applications requiring maximum tolerance precision, TL431BILPRAG delivers ±0.4% tolerance across -40°C to 85°C operating range with active production status and ROHS3 compliance.

Secondary Substitutes (Limited Temperature Range):

TL431ACLPRAG and TL431BCLPRAG are active production alternatives with improved tolerance specifications (±1% and ±0.4% respectively) but operate within the narrower 0°C to 70°C temperature range.

Obsolete Alternatives (Not Recommended for New Designs):

TL431AILPRPG, TL431BCLPRMG, and TL431BVLPRAG carry obsolete product status and should not be selected for new production designs despite technical compatibility.

All substitute candidates are ROHS3 compliant and maintain identical package configuration (TO-92-3 through-hole) with the original KA431ZTF.

Frequently Asked Questions (FAQ)

Q: Can TL431CLPRAG directly replace KA431ZTF in existing designs?

A: TL431CLPRAG is functionally compatible with KA431ZTF. Both components share identical output voltage range (2.5V to 36V), current capacity (100 mA), package type (TO-92-3), and temperature coefficient (50ppm/°C). The tolerance specification differs slightly (±2.2% versus ±2%), which is within typical circuit margin tolerances. Operating temperature range for TL431CLPRAG is 0°C to 70°C compared to KA431ZTF at -25°C to 85°C; verify your application's temperature requirements before selection.

Q: What is the difference between TL431AILPRAG and TL431BILPRAG?

A: Both parts maintain identical electrical specifications including output voltage range, current capacity, and package configuration. The primary difference is tolerance: TL431AILPRAG specifies ±1% tolerance while TL431BILPRAG specifies ±0.4% tolerance. Both operate across -40°C to 85°C. Select TL431BILPRAG for applications requiring tighter voltage regulation; select TL431AILPRAG for cost-optimized designs where ±1% tolerance is acceptable.

Q: Why do some substitute parts have different minimum output voltages (2.495V versus 2.5V)?

A: The 2.495V specification for TL431 series parts represents the typical adjustable reference voltage, which is functionally equivalent to the 2.5V specification of the KA431ZTF. Both values fall within acceptable operating margins for adjustable shunt reference applications. This difference does not affect substitution compatibility.

Q: Are all substitute parts ROHS3 compliant?

A: All active production substitute parts listed (TL431ACLPRAG, TL431AILPRAG, TL431BCLPRAG, TL431BILPRAG, TL431CLPRAG, TL431CLPRPG, TL431ILPRAG) are ROHS3 compliant. The original KA431ZTF does not specify RoHS status. Verify RoHS compliance requirements for your application before final part selection.

Q: Which substitute offers the widest operating temperature range?

A: TL431BVLPRAG operates across -40°C to 125°C, providing the widest temperature coverage. However, this part carries obsolete product status. For active production parts, TL431AILPRAG, TL431AILPRPG, TL431BILPRAG, and TL431ILPRAG all operate across -40°C to 85°C, which exceeds the original KA431ZTF range of -25°C to 85°C.

Q: Can I use a substitute with tighter tolerance (±0.4%) in place of KA431ZTF (±2%)?

A: Yes. Parts with tighter tolerance specifications (TL431BCLPRAG, TL431BCLPRMG, TL431BILPRAG, TL431BVLPRAG at ±0.4%) are functionally compatible and provide improved voltage regulation precision. This substitution introduces no compatibility issues and may enhance circuit performance. Verify that your circuit design does not depend on the original ±2% tolerance specification.

Q: What packaging options are available for substitutes?

A: All substitute parts maintain the TO-92-3 through-hole package configuration identical to KA431ZTF. No alternative package options are provided in the substitute list. PCB layout and mechanical mounting remain unchanged.

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