LM431BIZ Equivalent & Substitute Parts

Part Overview

The LM431BIZ is a shunt voltage reference IC with adjustable output (2.495V to 36V) and ±1% tolerance, manufactured by onsemi in TO-92-3 package. This part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. Substitute parts maintain the same electrical characteristics while offering improved availability and active product status.

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	50ppm/°C Typical
Current - Cathode	1 mA
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	TO-92-3 (TO-226-3)

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Primary Matching Parameters:

Reference Type: Shunt
Output Type: Adjustable
Voltage range: 2.495V to 36V minimum
Current - Output: 100 mA
Package / Case: TO-92-3 (TO-226-3)
Mounting Type: Through Hole

Secondary Considerations:

Tolerance: ±1% or better (tighter tolerance acceptable)
Operating Temperature: Must cover -40°C ~ 85°C minimum
Current - Cathode: 1 mA nominal (variations acceptable within design margins)

Parts are grouped into three categories: Similar (same base specifications, different manufacturers or packaging), Direct (functionally equivalent from alternative manufacturers), and Upgrade (enhanced specifications with extended temperature range or improved tolerance).

Parameter Comparison

Part Number	Manufacturer	Tolerance	Temp Range	Current - Cathode	Product Status	Packaging
LM431BIZ	onsemi	±1%	-40°C ~ 85°C	1 mA	Obsolete	Bulk
LM431BIZX	onsemi	±1%	-40°C ~ 85°C	1 mA	Active	Cut Tape (CT)
TL431ACLPG	onsemi	±1%	0°C ~ 70°C	1 mA	Active	Bulk
TL431BILPG	onsemi	±0.4%	-40°C ~ 85°C	1 mA	Active	Bulk
TL431ILPG	onsemi	±2.2%	-40°C ~ 85°C	1 mA	Active	Bulk
TL431AILP	Toshiba Semiconductor and Storage	Not specified	Not specified	Not specified	Active	Not specified
TL431AILPE3	Texas Instruments	±1%	-40°C ~ 85°C	700 µA	Obsolete	Bulk
TL431AIZ	STMicroelectronics	±1%	-40°C ~ 105°C	700 µA	Active	Bulk
AS431AZTR-E1	Diodes Incorporated	±0.5%	-40°C ~ 125°C	1 mA	Active	Cut Tape (CT)
AS431IAZTR-G1	Diodes Incorporated	±0.5%	-40°C ~ 125°C	50 µA	Active	Cut Tape (CT)
TL1431CLP	Texas Instruments	±0.4%	0°C ~ 70°C	1 mA	Active	Bulk

Engineering Selection Recommendations

Direct Replacement (Active Status, Identical Specifications): LM431BIZX is the direct active equivalent from onsemi, maintaining all electrical parameters and operating temperature range. This part is recommended as the primary substitute due to identical specifications and active product status.

Enhanced Tolerance Alternatives: TL431BILPG and AS431AZTR-E1 offer improved tolerance (±0.4% and ±0.5% respectively) while maintaining the 100 mA output current and TO-92-3 package. These are suitable for applications requiring tighter voltage regulation.

Extended Temperature Range: TL431AIZ (STMicroelectronics) extends the operating temperature to -40°C ~ 105°C and maintains ±1% tolerance. AS431AZTR-E1 and AS431IAZTR-G1 (Diodes Incorporated) support -40°C ~ 125°C operation, suitable for high-temperature environments.

Compliance Considerations: All active substitute parts carry ROHS3 compliance and REACH Unaffected status, meeting modern regulatory requirements. Obsolete parts (TL431AILPE3) should be avoided for new designs despite functional equivalence.

Temperature Range Limitations: TL431ACLPG and TL1431CLP operate only at 0°C ~ 70°C, restricting use to commercial temperature applications. These are not suitable for the full -40°C ~ 85°C range of the LM431BIZ.

Frequently Asked Questions (FAQ)

Q: Can I use TL431AILPE3 as a direct replacement for LM431BIZ? A: TL431AILPE3 matches the electrical specifications (±1% tolerance, -40°C ~ 85°C range) and package type. However, it is classified as obsolete. For new designs, use active alternatives such as LM431BIZX or TL431AIZ.

Q: What is the difference between LM431BIZ and LM431BIZX? A: Both parts are from onsemi with identical electrical specifications. The primary difference is packaging format: LM431BIZ is supplied in bulk, while LM431BIZX is supplied in cut tape. LM431BIZX has active product status.

Q: Are the Diodes Incorporated AS431 series parts compatible? A: Yes. AS431AZTR-E1 and AS431IAZTR-G1 are compatible substitutes with improved tolerance (±0.5%) and extended temperature range (-40°C ~ 125°C). The main difference is cathode current: AS431AZTR-E1 draws 1 mA, while AS431IAZTR-G1 draws 50 µA.

Q: Why do some substitutes have different cathode current specifications? A: Cathode current variation (1 mA vs. 700 µA vs. 50 µA) reflects different IC designs. All values remain within acceptable operating margins for shunt voltage reference applications. Verify circuit design compatibility if cathode current is a critical parameter.

Q: Can I use TL431ACLPG in a -40°C application? A: No. TL431ACLPG operates only at 0°C ~ 70°C. For full -40°C ~ 85°C coverage, use LM431BIZX, TL431BILPG, TL431ILPG, TL431AILPE3, or TL431AIZ.

Q: Which substitute offers the best tolerance? A: AS431AZTR-E1 and AS431IAZTR-G1 offer ±0.5% tolerance, followed by TL431BILPG and TL1431CLP at ±0.4%. The original LM431BIZ and most direct equivalents specify ±1%.

Q: Are all substitutes RoHS compliant? A: All active substitute parts carry ROHS3 compliance. Obsolete parts (LM431BIZ, TL431AILPE3) have varying compliance status. Verify compliance requirements for your application.

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