P4SMA120 Equivalent & Substitute Parts

Part Overview

The P4SMA120 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 102V reverse standoff voltage with a 173.25V maximum clamping voltage and 2.5A peak pulse current capability in a surface-mount DO-214AC (SMA) package. The product is currently obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	102V
Voltage - Breakdown (Min)	108.3V
Voltage - Clamping (Max) @ Ipp	173.25V
Current - Peak Pulse (10/1000µs)	2.5A
Power - Peak Pulse	400W
Mounting Type	Surface Mount
Package / Case	DO-214AC, SMA
Operating Temperature	-65°C ~ 150°C (TJ)
Type	Zener
Unidirectional Channels	1

Substitute Part Grouping Explanation

Substitution eligibility for the P4SMA120 is determined by the following critical parameters:

Reverse standoff voltage within the 102V specification
Breakdown voltage minimum at or above 108.3V
Clamping voltage performance compatible with circuit protection requirements
Peak pulse current capability of 2.5A or greater
Surface-mount DO-214AC (SMA) package compatibility
Operating temperature range encompassing the application environment

The substitute parts identified maintain these core electrical and mechanical specifications, ensuring functional equivalence in transient voltage suppression applications.

Parameter Comparison

Parameter	P4SMA120 (Littelfuse)	P4SMA120A (Eaton)	SMAJ120A-13-F (Diodes Inc.)	SMAJP4KE120A-TP (Micro Commercial)
Manufacturer	Littelfuse Inc.	Eaton - Electronics Division	Diodes Incorporated	Micro Commercial Co
Product Status	Obsolete	Active	Active	Active
Voltage - Reverse Standoff (Typ)	102V	102V	120V	102V
Voltage - Breakdown (Min)	108.3V	114V	133V	114V
Voltage - Clamping (Max) @ Ipp	173.25V	165V	193V	165V
Current - Peak Pulse (10/1000µs)	2.5A	2.5A	2A	2.5A
Power - Peak Pulse	400W	400W	400W	400W
Operating Temperature	-65°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)	-55°C ~ 175°C (TJ)
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Type	Zener	Zener	Zener	Zener
Unidirectional Channels	1	1	1	1
RoHS Status	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	Not specified
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

P4SMA120A (Eaton - Electronics Division) is the primary substitute for the obsolete P4SMA120. This part maintains identical reverse standoff voltage (102V), equivalent peak pulse current (2.5A), and matching package specifications. The component is in active production status with RoHS compliance certification and substantial inventory availability (37,900 pcs). The clamping voltage of 165V is lower than the original specification, providing improved protection margins in most general-purpose applications.

SMAJP4KE120A-TP (Micro Commercial Co) provides an alternative with identical electrical performance to the P4SMA120A, including 102V standoff voltage, 2.5A peak pulse current, and 165V clamping voltage. This part offers an extended operating temperature range (-55°C ~ 175°C) and is actively produced. The bulk packaging format may require consideration for procurement workflows.

SMAJ120A-13-F (Diodes Incorporated) is a secondary option with higher voltage specifications (120V standoff, 133V breakdown minimum, 193V clamping). This part is suitable only for applications where the elevated voltage ratings do not conflict with circuit design parameters. The reduced peak pulse current (2A versus 2.5A) may limit applicability in high-transient environments. This component carries automotive-grade certification and ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can P4SMA120A directly replace the obsolete P4SMA120?

A: Yes. Both parts share identical reverse standoff voltage (102V), peak pulse current (2.5A), and DO-214AC (SMA) package specifications. The P4SMA120A is actively produced by Eaton and maintains functional equivalence for general-purpose transient voltage suppression.

Q: What is the difference between the clamping voltages of these substitutes?

A: The P4SMA120 specifies 173.25V maximum clamping voltage. The P4SMA120A and SMAJP4KE120A-TP both clamp at 165V, providing tighter voltage regulation. The SMAJ120A-13-F clamps at 193V, which is higher and suitable only for applications tolerating elevated clamping voltages.

Q: Are all substitute parts available in the same package?

A: Yes. All identified substitutes use the DO-214AC (SMA) surface-mount package, ensuring mechanical and electrical compatibility with existing PCB layouts and assembly processes.

Q: Does the operating temperature range affect substitution decisions?

A: The original P4SMA120 operates from -65°C to 150°C. The P4SMA120A and SMAJ120A-13-F operate from -55°C to 150°C, which is acceptable for most applications. The SMAJP4KE120A-TP extends to 175°C, providing additional thermal margin for high-temperature environments.

Q: What compliance certifications should I verify for my application?

A: All substitutes maintain RoHS compliance and MSL Level 1 (unlimited moisture sensitivity). The P4SMA120A and SMAJ120A-13-F carry ROHS3 certification. Verify that selected substitutes meet your specific regulatory and environmental requirements.

Q: Is the 2A peak pulse current of SMAJ120A-13-F sufficient?

A: The SMAJ120A-13-F provides 2A peak pulse current compared to 2.5A in the original and other substitutes. This part is suitable only for applications where transient current levels do not exceed 2A. Verify circuit transient specifications before selection.

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