KA431AZBU Equivalent & Substitute Parts

Part Overview

The KA431AZBU is a shunt voltage reference IC manufactured by onsemi, designed for adjustable voltage regulation applications. This component provides a fixed output voltage of 2.495V with a maximum output of 36V and supports 100 mA output current. The part is currently in active production status with 1491 pieces in stock.

Equivalent and substitute parts are necessary when the primary component becomes unavailable, when design requirements demand extended temperature ranges, improved tolerance specifications, or when alternative manufacturers offer superior inventory availability or compliance certifications.

Key Parameters

Parameter	KA431AZBU
Manufacturer	onsemi
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	36V
Current - Output	100 mA
Tolerance	±1%
Temperature Coefficient	50ppm/°C Typical
Current - Cathode	1 mA
Operating Temperature	-25°C ~ 85°C
Package / Case	TO-226-3, TO-92-3
Mounting Type	Through Hole
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the KA431AZBU is determined by the following critical parameters:

Core Electrical Requirements:

Reference Type: Shunt
Output Type: Adjustable
Voltage - Output (Min/Fixed): 2.495V or 2.5V
Voltage - Output (Max): 36V
Current - Output: 100 mA
Package / Case: TO-226-3 or TO-92-3 compatible
Mounting Type: Through Hole

Tolerance and Performance Considerations:

Tolerance specifications ranging from ±0.4% to ±2.2% are acceptable as they represent equal or tighter specifications than the ±1% requirement
Temperature Coefficient: 50ppm/°C or better
Current - Cathode: 1 mA or lower

Compliance Requirements:

RoHS3 Compliant
REACH Unaffected
ECCN: EAR99

Parts meeting these criteria are classified as direct substitutes. Parts with extended operating temperature ranges or improved tolerance specifications are classified as upgrades.

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min)	Voltage Output (Max)	Current Output	Tolerance	Temp Coefficient	Operating Temp	Cathode Current	Product Status	Inventory
KA431AZBU	onsemi	2.495V	36V	100 mA	±1%	50ppm/°C	-25°C ~ 85°C	1 mA	Active	1491 Pcs
TL431ACLPG	onsemi	2.495V	36V	100 mA	±1%	50ppm/°C	0°C ~ 70°C	1 mA	Active	5300 Pcs
TL431BCLPG	onsemi	2.495V	36V	100 mA	±0.4%	50ppm/°C	0°C ~ 70°C	1 mA	Obsolete	3954 Pcs
TL431BILPG	onsemi	2.495V	36V	100 mA	±0.4%	50ppm/°C	-40°C ~ 85°C	1 mA	Active	1629 Pcs
TL431BVLPG	onsemi	2.495V	36V	100 mA	±0.4%	50ppm/°C	-40°C ~ 125°C	1 mA	Obsolete	2400 Pcs
TL431CLPG	onsemi	2.495V	36V	100 mA	±2.2%	50ppm/°C	0°C ~ 70°C	1 mA	Active	3100 Pcs
TL431ILPG	onsemi	2.495V	36V	100 mA	±2.2%	50ppm/°C	-40°C ~ 85°C	1 mA	Active	5798 Pcs
TL431AIZ	STMicroelectronics	2.495V	36V	100 mA	±1%	-	-40°C ~ 105°C	700 µA	Active	389850 Pcs
AS431AZTR-E1	Diodes Incorporated	2.5V	36V	100 mA	±0.5%	20ppm/°C	-40°C ~ 125°C	1 mA	Active	117200 Pcs
AS431IAZTR-G1	Diodes Incorporated	2.5V	36V	100 mA	±0.5%	-	-40°C ~ 125°C	50 µA	Active	56350 Pcs
LT1431CZ#PBF	Analog Devices Inc.	2.5V	36V	100 mA	±0.4%	30ppm/°C	0°C ~ 70°C	1 mA	Active	1900 Pcs

Engineering Selection Recommendations

Direct Substitutes (onsemi TL431 Series):

TL431ACLPG is a direct substitute with identical electrical specifications and active product status. The reduced operating temperature range (0°C ~ 70°C versus -25°C ~ 85°C) must be evaluated against application requirements. This part offers higher inventory availability at 5300 pieces.

TL431CLPG and TL431ILPG are functionally compatible with relaxed tolerance specifications (±2.2% versus ±1%). TL431ILPG extends the operating temperature to -40°C ~ 85°C and maintains active status with 5798 pieces in inventory.

TL431BILPG provides improved tolerance (±0.4%) with extended temperature range (-40°C ~ 85°C) and active product status, suitable for applications requiring tighter voltage regulation.

Upgrade Options:

TL431AIZ (STMicroelectronics) offers equivalent electrical performance with extended operating temperature range (-40°C ~ 105°C) and exceptional inventory availability (389850 pieces). Reduced cathode current (700 µA) may provide power efficiency benefits. This part is recommended for applications requiring extended temperature operation and maximum supply chain security.

AS431AZTR-E1 and AS431IAZTR-G1 (Diodes Incorporated) provide improved tolerance (±0.5%), extended temperature range (-40°C ~ 125°C), and superior inventory levels. AS431IAZTR-G1 features reduced cathode current (50 µA), offering enhanced power efficiency. Both parts are active and ROHS3 compliant.

LT1431CZ#PBF (Analog Devices Inc.) delivers improved tolerance (±0.4%) and superior temperature coefficient (30ppm/°C) with active product status. Operating temperature range is limited to 0°C ~ 70°C.

Obsolete Parts:

TL431BCLPG and TL431BVLPG are marked obsolete and should not be selected for new designs despite available inventory.

Frequently Asked Questions (FAQ)

Q: Can I use TL431ACLPG as a direct replacement for KA431AZBU?

A: Yes. Both parts share identical electrical specifications: 2.495V output, 36V maximum, 100 mA output current, ±1% tolerance, and 50ppm/°C temperature coefficient. The operating temperature range differs (0°C ~ 70°C versus -25°C ~ 85°C), requiring verification against your application's thermal requirements.

Q: What is the difference between TL431BILPG and TL431CLPG?

A: TL431BILPG provides tighter tolerance (±0.4% versus ±2.2%) and extended operating temperature (-40°C ~ 85°C versus 0°C ~ 70°C). Both maintain 100 mA output current and 2.495V minimum output. TL431BILPG is recommended for precision voltage regulation applications.

Q: Why is TL431AIZ listed as an upgrade?

A: TL431AIZ (STMicroelectronics) maintains equivalent electrical specifications while extending operating temperature to -40°C ~ 105°C and providing significantly higher inventory (389850 pieces). Reduced cathode current (700 µA) offers potential power efficiency improvements. This part is suitable for applications requiring extended thermal operation and enhanced supply chain availability.

Q: Are the Diodes Incorporated AS431 parts compatible?

A: Yes. AS431AZTR-E1 and AS431IAZTR-G1 meet core substitution criteria with 2.5V minimum output, 36V maximum, 100 mA output current, and TO-92-3 packaging. Both offer improved tolerance (±0.5%), extended temperature range (-40°C ~ 125°C), and high inventory availability. AS431IAZTR-G1 features reduced cathode current (50 µA).

Q: Can I use parts with different tolerance specifications?

A: Yes. Parts with tighter tolerance specifications (±0.4% or ±0.5%) are acceptable substitutes for the ±1% requirement. Parts with relaxed tolerance (±2.2%) are functionally compatible but may not meet precision voltage regulation requirements. Application-specific accuracy needs must be evaluated.

Q: What is the significance of cathode current differences?

A: Cathode current affects power consumption in the reference circuit. Lower cathode current (50 µA in AS431IAZTR-G1 versus 1 mA in KA431AZBU) reduces power dissipation. Higher cathode current (700 µA in TL431AIZ) may require circuit design adjustments but remains functionally compatible.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: Should I avoid obsolete parts?

A: Yes. TL431BCLPG and TL431BVLPG are marked obsolete and should not be selected for new designs. Use active status parts to ensure long-term supply chain support and design longevity.

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