LM431CCZX Equivalent & Substitute Parts

Part Overview

The LM431CCZX 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 LM431CCZX is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Shunt voltage reference ICs are critical components in precision voltage regulation, power supply feedback networks, and precision current sources.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM431CCZX
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)
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the LM431CCZX is determined by the following critical parameters:

Electrical Compatibility Requirements:

Reference Type: Shunt (all substitutes must be shunt-type voltage references)
Output Type: Adjustable (maintains circuit design compatibility)
Voltage - Output (Min/Fixed): 2.495V or 2.5V (functionally equivalent for most applications)
Voltage - Output (Max): 36V (maximum voltage rating must be maintained or exceeded)
Current - Output: 100 mA (output current capability must be maintained or exceeded)
Current - Cathode: 1 mA or lower (cathode current specifications)
Operating Temperature: Must support -25°C minimum or lower

Mechanical Compatibility Requirements:

Mounting Type: Through Hole (pin configuration compatibility)
Package / Case: TO-92-3 or TO-226-3 (physical form factor)

Tolerance Considerations: Tolerance specifications (±0.5%, ±0.4%, ±1%, ±2.2%, ±0.25%) determine precision levels. Tighter tolerances provide superior performance but are not required for basic substitution if circuit design permits.

Substitute parts are grouped into three categories: direct onsemi replacements (TL431 series), parametric equivalents from alternative manufacturers (KA431, AS431 series), and precision alternatives (TL1431 series from STMicroelectronics and Texas Instruments).

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min)	Voltage Output (Max)	Current Output	Tolerance	Temp Coefficient	Operating Temp	Package	Status
LM431CCZX	onsemi	2.495V	36V	100 mA	±0.5%	50ppm/°C	-25°C ~ 85°C	TO-92-3	Obsolete
TL431AILPRAG	onsemi	2.495V	36V	100 mA	±1%	50ppm/°C	-40°C ~ 85°C	TO-92-3	Active
TL431AILPRPG	onsemi	2.495V	36V	100 mA	±1%	50ppm/°C	-40°C ~ 85°C	TO-92-3	Obsolete
TL431BILPRAG	onsemi	2.495V	36V	100 mA	±0.4%	50ppm/°C	-40°C ~ 85°C	TO-92-3	Active
TL431ILPRAG	onsemi	2.495V	36V	100 mA	±2.2%	50ppm/°C	-40°C ~ 85°C	TO-92-3	Active
TL431ILPRPG	onsemi	2.495V	36V	100 mA	±2.2%	50ppm/°C	-40°C ~ 85°C	TO-92-3	Active
KA431LZTA	onsemi	2.495V	36V	100 mA	±0.5%	50ppm/°C	-25°C ~ 85°C	TO-92-3	Active
AS431AZTR-E1	Diodes Incorporated	2.5V	36V	100 mA	±0.5%	20ppm/°C	-40°C ~ 125°C	TO-92-3	Active
AS431IAZTR-G1	Diodes Incorporated	2.5V	36V	100 mA	±0.5%	Not Specified	-40°C ~ 125°C	TO-92-3	Active
TL1431AIZT	STMicroelectronics	2.5V	36V	100 mA	±0.25%	100ppm/°C	-40°C ~ 105°C	TO-92-3	Active
TL1431CLPME3	Texas Instruments	2.5V	36V	100 mA	±0.4%	Not Specified	0°C ~ 70°C	TO-92-3	Active

Engineering Selection Recommendations

Primary Recommendation - onsemi TL431 Series (Active Status):

The TL431BILPRAG offers the closest electrical match to the LM431CCZX with active product status. It maintains identical voltage output range (2.495V to 36V), 100 mA output current, and 50ppm/°C temperature coefficient. The tolerance specification of ±0.4% is superior to the original ±0.5%, and the extended operating temperature range (-40°C to 85°C) provides improved thermal coverage. This part is manufactured by onsemi, ensuring design continuity and supply chain consistency.

Alternative - onsemi KA431LZTA (Active Status, Parametric Equivalent):

The KA431LZTA provides an exact electrical match with ±0.5% tolerance identical to the LM431CCZX. This part maintains the same voltage specifications, output current, and temperature coefficient. Active product status ensures long-term availability. The KA431 base product number indicates a different design variant within the onsemi portfolio, suitable for applications where tolerance matching is critical.

Cross-Manufacturer Alternative - Diodes Incorporated AS431 Series (Active Status):

The AS431AZTR-E1 and AS431IAZTR-G1 provide functional equivalence with extended operating temperature range (-40°C to 125°C). Output voltage is specified as 2.5V (versus 2.495V), which is functionally compatible for most applications. Both parts maintain 100 mA output current and ±0.5% tolerance. The AS431AZTR-E1 specifies 20ppm/°C temperature coefficient, providing superior thermal stability compared to the original 50ppm/°C specification.

Precision Alternative - STMicroelectronics TL1431AIZT (Active Status):

The TL1431AIZT offers enhanced precision with ±0.25% tolerance and extended operating temperature range (-40°C to 105°C). This part is suitable for applications requiring tighter voltage regulation. The 100ppm/°C temperature coefficient is higher than the original specification, requiring thermal compensation consideration in precision circuits.

Compliance Considerations:

All recommended substitutes carry ROHS3 compliance and REACH Unaffected status, ensuring regulatory compatibility with modern manufacturing and environmental standards. The original LM431CCZX carries REACH Unaffected status but lacks explicit RoHS certification due to its obsolete status.

Frequently Asked Questions (FAQ)

Q: Can I directly replace LM431CCZX with TL431BILPRAG without circuit modifications?

A: Yes. Both parts are shunt voltage reference ICs with identical voltage output range (2.495V to 36V), 100 mA output current, and TO-92-3 package. The TL431BILPRAG offers superior tolerance (±0.4% versus ±0.5%) and extended temperature range. Pin configuration and functional behavior are compatible for direct substitution.

Q: What is the difference between onsemi TL431 and KA431 series?

A: Both are onsemi shunt voltage reference ICs with identical electrical specifications for the recommended parts. The KA431LZTA matches the original LM431CCZX tolerance (±0.5%) exactly, while TL431 variants offer different tolerance grades (±0.4%, ±1%, ±2.2%). Selection depends on precision requirements and availability.

Q: Can I use Diodes Incorporated AS431 series as a substitute?

A: Yes. The AS431AZTR-E1 and AS431IAZTR-G1 are functionally equivalent with output voltage specified as 2.5V (versus 2.495V), which is compatible for most applications. Both maintain 100 mA output current and ±0.5% tolerance. The extended operating temperature range (-40°C to 125°C) provides improved thermal coverage compared to the original -25°C to 85°C specification.

Q: What is the significance of tolerance specifications (±0.5%, ±0.4%, ±1%, ±2.2%)?

A: Tolerance specifies the accuracy of the output voltage. The LM431CCZX guarantees output voltage within ±0.5% of nominal. Tighter tolerances (±0.4%, ±0.25%) provide more precise voltage regulation, suitable for sensitive applications. Looser tolerances (±1%, ±2.2%) are acceptable for applications with wider voltage acceptance windows. Selection depends on circuit requirements, not substitution compatibility.

Q: Are all substitute parts available in the same TO-92-3 package?

A: Yes. All recommended substitutes use TO-92-3 or TO-226-3 package designation, which are physically and electrically compatible. Pin configuration and lead spacing are identical, enabling direct PCB compatibility without layout modifications.

Q: What is the difference between operating temperature ranges?

A: The LM431CCZX operates from -25°C to 85°C. Most active substitutes extend this to -40°C to 85°C or -40°C to 125°C. Extended temperature ranges provide operational capability in wider environmental conditions. Selection depends on application requirements; extended range is not required for substitution but provides design flexibility.

Q: Why is the LM431CCZX obsolete?

A: Obsolescence indicates the manufacturer has discontinued production. Active substitutes from onsemi (TL431 series, KA431LZTA) and alternative manufacturers (Diodes Incorporated AS431, STMicroelectronics TL1431) provide equivalent functionality with ongoing production support and long-term availability.

Q: Can I substitute parts with different tolerance grades in the same circuit?

A: Tolerance substitution depends on circuit design margins. If the original design accommodates ±0.5% tolerance, substituting with ±0.4% (tighter) is always acceptable. Substituting with ±1% or ±2.2% (looser) requires verification that circuit performance remains within specifications. Consult circuit design documentation to confirm tolerance compatibility.

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