FAN431LZXA Equivalent & Substitute Parts

Part Overview

The FAN431LZXA is a shunt voltage reference IC manufactured by onsemi, designed for adjustable output voltage regulation in power management applications. This component features an adjustable output range from 2.495V to 36V with ±0.5% tolerance and supports output currents up to 100 mA in a TO-92-3 through-hole package. The FAN431LZXA is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	FAN431LZXA
Manufacturer	onsemi
Category	Power Management (PMIC)
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	36V
Current - Output	100 mA
Tolerance	±0.5%
Temperature Coefficient	50ppm/°C Typical
Current - Cathode	1 mA
Operating Temperature	-25°C ~ 85°C (TA)
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the FAN431LZXA is determined by the following critical parameters that must remain constant or compatible:

Core Electrical Parameters:

Reference Type: Shunt
Output Type: Adjustable
Voltage Output Range: 2.495V to 36V (minimum output must be ≤2.495V; maximum output must be ≥36V)
Current Output: 100 mA
Tolerance: ±0.5% or better (lower tolerance values are acceptable)
Current Cathode: 1 mA nominal

Mechanical & Environmental Parameters:

Package: TO-92-3 (TO-226-3, TO-226AA Formed Leads)
Mounting Type: Through Hole
Operating Temperature Range: Must support -25°C to 85°C minimum

Compliance & Status:

RoHS3 Compliance preferred for new designs
REACH Unaffected status required

Substitute parts are grouped into three categories: Similar parts from onsemi with minor tolerance variations, parametric equivalents from alternative manufacturers, and direct equivalents from other manufacturers meeting identical electrical specifications.

Parameter Comparison

Part Number	Manufacturer	Tolerance	Output Range (Min/Max)	Current Output	Cathode Current	Operating Temp	Product Status	RoHS Status
FAN431LZXA	onsemi	±0.5%	2.495V / 36V	100 mA	1 mA	-25°C ~ 85°C	Obsolete	Not Specified
TL431ACLPRAG	onsemi	±1%	2.495V / 36V	100 mA	1 mA	0°C ~ 70°C	Active	ROHS3 Compliant
TL431AILPRAG	onsemi	±1%	2.495V / 36V	100 mA	1 mA	-40°C ~ 85°C	Active	ROHS3 Compliant
TL431AILPRPG	onsemi	±1%	2.495V / 36V	100 mA	1 mA	-40°C ~ 85°C	Obsolete	ROHS3 Compliant
TL431BILPRAG	onsemi	±0.4%	2.495V / 36V	100 mA	1 mA	-40°C ~ 85°C	Active	ROHS3 Compliant
TL431ILPRAG	onsemi	±2.2%	2.495V / 36V	100 mA	1 mA	-40°C ~ 85°C	Active	ROHS3 Compliant
TL431ILPRPG	onsemi	±2.2%	2.495V / 36V	100 mA	1 mA	-40°C ~ 85°C	Active	ROHS3 Compliant
KA431LZTA	onsemi	±0.5%	2.495V / 36V	100 mA	1 mA	-25°C ~ 85°C	Active	ROHS3 Compliant
TL431BILPR	Texas Instruments	±0.5%	2.495V / 36V	100 mA	700 µA	-40°C ~ 85°C	Active	ROHS3 Compliant
AS431AZTR-E1	Diodes Incorporated	±0.5%	2.5V / 36V	100 mA	1 mA	-40°C ~ 125°C	Active	ROHS3 Compliant
AS431IAZTR-G1	Diodes Incorporated	±0.5%	2.5V / 36V	100 mA	50 µA	-40°C ~ 125°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: KA431LZTA

The KA431LZTA from onsemi provides the closest electrical match to the FAN431LZXA with identical tolerance (±0.5%), output voltage range (2.495V to 36V), output current (100 mA), and operating temperature range (-25°C to 85°C). This part is currently in active production status with ROHS3 compliance and 25,300 units in stock, making it the optimal choice for direct replacement in new designs and production continuity.

Secondary Recommendation: TL431BILPRAG

The TL431BILPRAG from onsemi offers superior tolerance performance at ±0.4%, exceeding the original specification. It maintains identical electrical parameters for output voltage range and current, supports an extended operating temperature range (-40°C to 85°C), and is actively produced with ROHS3 compliance. This part is suitable for applications requiring tighter tolerance control.

Alternative from Texas Instruments: TL431BILPR

The TL431BILPR from Texas Instruments matches the FAN431LZXA in tolerance (±0.5%), output voltage range, and output current. It features a reduced cathode current of 700 µA compared to the original 1 mA specification and supports an extended operating temperature range (-40°C to 85°C). This part is ROHS3 compliant and actively produced.

Cross-Manufacturer Alternatives: AS431AZTR-E1 and AS431IAZTR-G1

Both Diodes Incorporated AS431 series parts maintain ±0.5% tolerance and 100 mA output current with identical package specifications. The AS431AZTR-E1 features a minimum output voltage of 2.5V (compared to 2.495V) and supports an extended operating temperature range to 125°C. The AS431IAZTR-G1 offers reduced cathode current at 50 µA. Both are ROHS3 compliant and actively produced with substantial inventory availability.

Not Recommended for Direct Replacement:

TL431ACLPRAG and TL431AILPRAG feature ±1% tolerance, which represents a degradation from the original ±0.5% specification. These parts are suitable only for applications where the relaxed tolerance is acceptable. TL431AILPRPG is obsolete and should not be selected for new designs.

Frequently Asked Questions (FAQ)

Q: Can I use TL431AILPRAG as a direct replacement for FAN431LZXA?

A: TL431AILPRAG is electrically compatible in terms of output voltage range (2.495V to 36V) and output current (100 mA). However, its tolerance specification is ±1% compared to the original ±0.5%, representing a two-fold relaxation in accuracy. This substitution is acceptable only if your circuit design tolerates the wider tolerance band. The part is actively produced and ROHS3 compliant.

Q: What is the difference between KA431LZTA and FAN431LZXA?

A: Both parts share identical electrical specifications: ±0.5% tolerance, 2.495V to 36V output range, 100 mA output current, and -25°C to 85°C operating temperature. The primary difference is manufacturer designation and product status. KA431LZTA is currently in active production with ROHS3 compliance, while FAN431LZXA is obsolete. KA431LZTA is the recommended replacement.

Q: Are the Diodes Incorporated AS431 parts compatible with my design?

A: AS431AZTR-E1 and AS431IAZTR-G1 are compatible with FAN431LZXA designs. Both maintain ±0.5% tolerance, 100 mA output current, and TO-92-3 package specifications. The minimum output voltage is 2.5V instead of 2.495V, which is negligible for most applications. Both parts support extended operating temperatures to 125°C and are actively produced with high inventory availability.

Q: Why does TL431BILPR show 700 µA cathode current instead of 1 mA?

A: Cathode current specification variation does not affect circuit compatibility. The 700 µA cathode current in TL431BILPR is a design characteristic of the Texas Instruments version and remains within acceptable operating parameters for shunt voltage reference applications. This part maintains all critical electrical specifications for output voltage, current, and tolerance.

Q: Can I use parts with ±2.2% tolerance like TL431ILPRAG?

A: TL431ILPRAG and TL431ILPRPG are electrically compatible but feature significantly relaxed tolerance at ±2.2% compared to the original ±0.5%. These parts are suitable only for applications where output voltage accuracy is not critical. Both are actively produced and ROHS3 compliant.

Q: What packaging considerations apply to these substitutes?

A: All listed substitute parts use identical TO-92-3 (TO-226-3, TO-226AA Formed Leads) through-hole packaging. No PCB layout modifications are required for mechanical compatibility. All parts are suitable for standard through-hole soldering processes.

Q: Are all substitute parts RoHS compliant?

A: All recommended substitute parts are ROHS3 compliant. The original FAN431LZXA RoHS status was not specified in available documentation. For applications requiring RoHS certification, select from the active production parts with confirmed ROHS3 compliance: KA431LZTA, TL431BILPRAG, TL431BILPR, AS431AZTR-E1, or AS431IAZTR-G1.

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