KA431AZTF Equivalent & Substitute Parts

Part Overview

The KA431AZTF is a shunt voltage reference IC manufactured by onsemi, designed for adjustable voltage regulation applications. This component provides a fixed reference voltage of 2.495V with adjustable output up to 36V, delivering 100 mA output current with ±1% tolerance. The device is packaged in TO-92-3 (TO-226AA) through-hole configuration and operates across -25°C to 85°C.

The KA431AZTF is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. Substitute parts must maintain electrical compatibility across voltage output range, current capacity, tolerance specifications, and mechanical packaging to ensure direct circuit functionality.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	36V
Current - Output	100 mA
Tolerance	±1%
Temperature Coefficient	50 ppm/°C Typical
Current - Cathode	1 mA
Operating Temperature	-25°C ~ 85°C (TA)
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment with the following electrical and mechanical parameters:

Voltage output range: 2.495V minimum to 36V maximum
Output current capacity: 100 mA
Reference type: Shunt configuration
Output type: Adjustable
Mounting: Through-hole TO-92-3 package
Temperature coefficient: 50 ppm/°C typical

Tolerance variations (±1%, ±0.4%, ±2.2%) are acceptable substitution criteria when all other parameters align, as tighter tolerances provide enhanced performance in the same application context. Operating temperature ranges may vary; parts with extended or equivalent ranges are suitable substitutes. Product status (active vs. obsolete) does not affect electrical substitutability but influences long-term availability.

Parameter Comparison

Part Number	Manufacturer	Status	Voltage Output (Min/Max)	Current Output	Tolerance	Temp Coeff	Operating Temp	Package
KA431AZTF	onsemi	Obsolete	2.495V / 36V	100 mA	±1%	50 ppm/°C	-25°C ~ 85°C	TO-92-3
LM431BCZXA	onsemi	Active	2.495V / 36V	100 mA	±1%	50 ppm/°C	-25°C ~ 85°C	TO-92-3
TL431BCLPRAG	onsemi	Active	2.495V / 36V	100 mA	±0.4%	50 ppm/°C	0°C ~ 70°C	TO-92-3
TL431BCLPRMG	onsemi	Obsolete	2.495V / 36V	100 mA	±0.4%	50 ppm/°C	0°C ~ 70°C	TO-92-3
TL431BILPRAG	onsemi	Active	2.495V / 36V	100 mA	±0.4%	50 ppm/°C	-40°C ~ 85°C	TO-92-3
TL431BVLPRAG	onsemi	Obsolete	2.495V / 36V	100 mA	±0.4%	50 ppm/°C	-40°C ~ 125°C	TO-92
TL431CLPRAG	onsemi	Active	2.495V / 36V	100 mA	±2.2%	50 ppm/°C	0°C ~ 70°C	TO-92
TL431CLPRPG	onsemi	Active	2.495V / 36V	100 mA	±2.2%	50 ppm/°C	0°C ~ 70°C	TO-92
TL431ILPRAG	onsemi	Active	2.495V / 36V	100 mA	±2.2%	50 ppm/°C	-40°C ~ 85°C	TO-92-3
TL431ILPRPG	onsemi	Active	2.495V / 36V	100 mA	±2.2%	50 ppm/°C	-40°C ~ 85°C	TO-92-3
FAN431AZXA	Fairchild Semiconductor	Active	2.495V / 36V	100 mA	±1%	50 ppm/°C	-25°C ~ 85°C	TO-92-3

Engineering Selection Recommendations

Primary Direct Substitute (Identical Specifications): LM431BCZXA is the recommended primary substitute. This onsemi part maintains exact electrical and thermal specifications as the KA431AZTF while offering active product status with ROHS3 compliance and superior long-term availability. Both parts share identical voltage output range (2.495V to 36V), 100 mA current capacity, ±1% tolerance, and -25°C to 85°C operating temperature.

Secondary Substitutes (Enhanced Tolerance): TL431BILPRAG and TL431ILPRPG provide tighter ±0.4% tolerance specifications with extended operating temperature ranges (-40°C to 85°C), suitable for applications requiring improved accuracy and wider thermal operation. Both maintain active product status and ROHS3 compliance.

Cross-Manufacturer Alternative: FAN431AZXA (Fairchild Semiconductor) offers parametric equivalence with identical electrical specifications and operating temperature range. This part provides supply chain diversification while maintaining full functional compatibility.

Compliance Considerations: All recommended substitutes carry ROHS3 compliance and REACH unaffected status, meeting modern regulatory requirements. The KA431AZTF's obsolete status necessitates transition to active alternatives for new production designs.

Frequently Asked Questions (FAQ)

Q: Can TL431BCLPRAG replace KA431AZTF directly in existing circuits? A: Yes. TL431BCLPRAG maintains identical voltage output range (2.495V to 36V), current capacity (100 mA), and package configuration (TO-92-3). The tighter ±0.4% tolerance provides improved performance. Operating temperature range differs (0°C to 70°C vs. -25°C to 85°C); verify application requirements before substitution.

Q: What is the difference between TO-92-3 and TO-92 packages? A: TO-92-3 specifies a three-lead through-hole package with short formed leads (TO-226AA). TO-92 (TO-226) refers to the long-body variant. Both are mechanically compatible in standard through-hole PCB layouts, though lead length may require board design verification.

Q: Is FAN431AZXA a suitable substitute for new production? A: Yes. FAN431AZXA matches all electrical parameters and operating temperature specifications of KA431AZTF. As an active product from Fairchild Semiconductor with ROHS3 compliance, it provides reliable long-term supply availability for new designs.

Q: Why do some substitutes have ±2.2% tolerance instead of ±1%? A: Tolerance variations reflect different product grades within the same functional family. Parts with ±2.2% tolerance (TL431CLPRAG, TL431ILPRAG, TL431ILPRPG) are suitable substitutes when circuit design tolerances permit wider voltage reference variation. Tighter tolerance parts (±0.4%) offer enhanced accuracy for precision applications.

Q: Can I use TL431BVLPRAG in applications requiring -25°C operation? A: No. TL431BVLPRAG operates from 0°C to 70°C, which does not cover the -25°C minimum of KA431AZTF. Select alternatives with -25°C or lower minimum operating temperature, such as LM431BCZXA or FAN431AZXA.

Q: Are all substitutes ROHS3 compliant? A: All recommended onsemi substitutes carry ROHS3 compliance. FAN431AZXA compliance status is not specified in provided data; verify with supplier documentation before procurement.

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