LM431CCZXA Equivalent & Substitute Parts

Part Overview

The LM431CCZXA is a shunt voltage reference IC manufactured by onsemi, designed for adjustable precision voltage regulation 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 part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM431CCZXA
Manufacturer	onsemi
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)
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the LM431CCZXA is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Reference Type: Shunt
Output Type: Adjustable
Voltage - Output (Min/Fixed): 2.495V or 2.5V
Voltage - Output (Max): 36V or higher
Current - Output: 100 mA
Tolerance: ±0.5% or tighter
Package / Case: TO-92-3 or equivalent TO-226-3
Mounting Type: Through Hole

Substitution Categories:

Direct Functional Equivalents maintain identical electrical specifications and package configuration. These parts are pin-compatible and require no circuit modifications.

Parameter-Compatible Substitutes meet or exceed the electrical requirements but may have different tolerance grades, temperature coefficients, or operating temperature ranges. These parts are functionally compatible when the application requirements permit the parameter variation.

Active Product Alternatives are currently manufactured parts that provide equivalent functionality to the obsolete LM431CCZXA, ensuring long-term availability and supply chain continuity.

Parameter Comparison

Part Number	Manufacturer	Voltage Min (V)	Voltage Max (V)	Current Output (mA)	Tolerance	Temp Coeff (ppm/°C)	Operating Temp (°C)	Package	Status
LM431CCZXA	onsemi	2.495	36	100	±0.5%	50 Typical	-25 ~ 85	TO-92-3	Obsolete
LM431CCZ	onsemi	2.495	36	100	±0.5%	50 Typical	-25 ~ 85	TO-92-3	Active
TL431AILPRAG	onsemi	2.495	36	100	±1%	50 Typical	-40 ~ 85	TO-92-3	Active
TL431AILPRPG	onsemi	2.495	36	100	±1%	50 Typical	-40 ~ 85	TO-92-3	Obsolete
TL431BILPRAG	onsemi	2.495	36	100	±0.4%	50 Typical	-40 ~ 85	TO-92-3	Active
TL431ILPRAG	onsemi	2.495	36	100	±2.2%	50 Typical	-40 ~ 85	TO-92-3	Active
TL431ILPRPG	onsemi	2.495	36	100	±2.2%	50 Typical	-40 ~ 85	TO-92-3	Active
KA431LZTA	onsemi	2.495	36	100	±0.5%	50 Typical	-25 ~ 85	TO-92-3	Active
LM431CCZ/NOPB	National Semiconductor	2.5	37	100	-0.6%, +0.4%	50 Typical	0 ~ 70	TO-92-3	Active
AS431AZTR-E1	Diodes Incorporated	2.5	36	100	±0.5%	20 Typical	-40 ~ 125	TO-92-3	Active
AS431IAZTR-G1	Diodes Incorporated	2.5	36	100	±0.5%	—	-40 ~ 125	TO-92-3	Active

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Recommended for Obsolete Part Replacement):

LM431CCZ is the primary substitute for LM431CCZXA. Both parts are manufactured by onsemi with identical electrical specifications (±0.5% tolerance, 2.495V to 36V output range, 100 mA output current) and package configuration (TO-92-3). LM431CCZ is currently in active production status with 12,900 units in stock, ensuring supply continuity. This part requires no circuit modifications and provides drop-in compatibility.

Tier 2 - Parameter-Compatible Active Alternatives:

KA431LZTA (onsemi) matches the LM431CCZXA specification exactly with ±0.5% tolerance and identical operating temperature range (-25°C to 85°C). This part is actively manufactured with 25,300 units available, providing superior supply availability.

AS431AZTR-E1 and AS431IAZTR-G1 (Diodes Incorporated) provide equivalent functionality with ±0.5% tolerance and extended operating temperature range (-40°C to 125°C). These parts feature improved temperature coefficient performance (20ppm/°C) and are available in high quantities (117,200 and 56,350 units respectively). Selection of these parts is appropriate when extended temperature operation is required.

Tier 3 - Tolerance-Relaxed Alternatives:

TL431AILPRAG and TL431AILPRPG (onsemi) provide ±1% tolerance with extended operating temperature range (-40°C to 85°C). These parts are suitable for applications where ±1% tolerance meets design requirements.

TL431BILPRAG (onsemi) offers tighter tolerance (±0.4%) with extended operating temperature range (-40°C to 85°C), suitable for precision applications requiring better than ±0.5% accuracy.

TL431ILPRAG and TL431ILPRPG (onsemi) feature ±2.2% tolerance and are appropriate only for applications with relaxed tolerance requirements.

Compliance and Certification:

All recommended active substitutes comply with ROHS3 standards and maintain REACH Unaffected status. All parts carry EAR99 export classification and HTSUS code 8542.39.0001.

Frequently Asked Questions (FAQ)

Q: Can LM431CCZ directly replace LM431CCZXA without circuit modifications?

A: Yes. LM431CCZ is a direct functional equivalent with identical electrical specifications and TO-92-3 package configuration. No circuit modifications are required. The primary difference is product status: LM431CCZXA is obsolete while LM431CCZ is actively manufactured.

Q: What is the difference between the LM431 and TL431 series?

A: Both series are shunt voltage reference ICs with adjustable output from 2.495V to 36V and 100 mA output current capability. The primary differences are tolerance grades and operating temperature ranges. LM431 parts typically feature ±0.5% tolerance with -25°C to 85°C operating range. TL431 parts are available in multiple tolerance grades (±0.4%, ±1%, ±2.2%) with extended operating temperature range (-40°C to 85°C). Selection depends on application tolerance and temperature requirements.

Q: Are the onsemi and Diodes Incorporated parts pin-compatible?

A: Yes. Both manufacturers produce shunt voltage reference ICs in TO-92-3 package with identical pin configuration. The AS431 series from Diodes Incorporated provides equivalent functionality with ±0.5% tolerance and extended operating temperature range (-40°C to 125°C).

Q: What does the tolerance specification mean for circuit design?

A: Tolerance specifies the accuracy of the reference voltage output at room temperature. LM431CCZXA with ±0.5% tolerance means the output voltage will be within ±0.5% of the nominal 2.495V value. Tighter tolerance (±0.4%) provides better accuracy; relaxed tolerance (±1%, ±2.2%) is acceptable for applications with less stringent voltage regulation requirements.

Q: How does temperature coefficient affect long-term performance?

A: Temperature coefficient (50ppm/°C typical for LM431CCZXA) specifies how the reference voltage changes with temperature. A 50ppm/°C coefficient means the output voltage changes approximately 0.005% per degree Celsius. For applications operating across wide temperature ranges, this parameter affects overall voltage regulation accuracy over the operating temperature span.

Q: Can I use AS431AZTR-E1 in place of LM431CCZXA if my application requires -40°C operation?

A: Yes. AS431AZTR-E1 provides ±0.5% tolerance with extended operating temperature range (-40°C to 125°C), making it suitable for applications requiring operation below -25°C. The part is functionally equivalent with identical output voltage range and current capability.

Q: What is the significance of the cathode current specification?

A: Cathode current (1 mA for LM431CCZXA) specifies the minimum current required through the reference IC for proper operation. This parameter is critical for circuit design to ensure adequate bias current is maintained. AS431IAZTR-G1 specifies 50 µA cathode current, indicating lower bias current requirement, which may reduce power consumption in some applications.

Q: Are all substitute parts RoHS3 compliant?

A: All active product substitutes listed (LM431CCZ, TL431 series, KA431LZTA, AS431 series) are RoHS3 compliant. The original LM431CCZXA does not specify RoHS status due to its obsolete status.

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