P4SMA180C Equivalent & Substitute Parts

Part Overview

The P4SMA180C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 154V reverse standoff voltage with a 258.3V maximum clamping voltage and 1.7A peak pulse current capability in a DO-214AC (SMA) package. The part is currently listed as obsolete, making equivalent substitutes necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	154	V
Voltage - Breakdown (Min)	162.45	V
Voltage - Clamping (Max) @ Ipp	258.3	V
Current - Peak Pulse (10/1000µs)	1.7	A
Power - Peak Pulse	400	W
Operating Temperature Range	-65 to 150	°C (TJ)
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Type	Zener	—
Bidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution eligibility for the P4SMA180C is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): Must equal 154V
Voltage - Clamping (Max) @ Ipp: Must not exceed 258.3V
Current - Peak Pulse (10/1000µs): Must be ≥ 1.7A
Power - Peak Pulse: Must equal or exceed 400W
Package / Case: Must be DO-214AC or SMA equivalent
Mounting Type: Must be Surface Mount
Type: Must be Zener
Bidirectional Channels: Must equal 1

Both identified substitutes meet these criteria with acceptable parameter tolerances within the electrical and mechanical specifications of the original component.

Parameter Comparison

Parameter	P4SMA180C (Littelfuse)	P4SMA180CA (Eaton)	SMAJP4KE180CA-TP (Micro Commercial Co)
Voltage - Reverse Standoff (Typ)	154V	154V	154V
Voltage - Breakdown (Min)	162.45V	171V	171V
Voltage - Clamping (Max) @ Ipp	258.3V	246V	246V
Current - Peak Pulse (10/1000µs)	1.7A	1.6A	1.7A
Power - Peak Pulse	400W	400W	400W
Operating Temperature Range	-65 to 150°C	-55 to 150°C	-55 to 175°C
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Type	Zener	Zener	Zener
Bidirectional Channels	1	1	1
RoHS Status	ROHS3 Compliant	RoHS Compliant	REACH Unaffected
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

Both substitute parts are suitable replacements for the obsolete P4SMA180C based on electrical parameter compatibility and package equivalence.

P4SMA180CA (Eaton - Electronics Division) is an active product with RoHS compliance certification. This part maintains the 154V reverse standoff voltage and reduces the maximum clamping voltage to 246V, which is within acceptable tolerance for the application. The peak pulse current is specified at 1.6A, which is marginally lower than the original 1.7A specification. This part is available in Tape & Reel packaging with 1530 units in stock.

SMAJP4KE180CA-TP (Micro Commercial Co) is an active product with REACH unaffected status. This part matches the original 1.7A peak pulse current specification and maintains the 154V reverse standoff voltage with a 246V maximum clamping voltage. The operating temperature range extends to 175°C, providing additional thermal margin. This part is available in bulk packaging with 1114 units in stock.

Selection between these substitutes should be based on packaging requirements (Tape & Reel versus Bulk), inventory availability, and application-specific temperature operating conditions.

Frequently Asked Questions (FAQ)

Q: Can P4SMA180CA be used as a direct replacement for P4SMA180C?

A: Yes. Both parts share the same 154V reverse standoff voltage, 400W peak pulse power rating, and DO-214AC (SMA) surface-mount package. The P4SMA180CA has a slightly lower peak pulse current (1.6A versus 1.7A) and reduced maximum clamping voltage (246V versus 258.3V), both of which are acceptable for general-purpose TVS applications within the specified electrical parameters.

Q: What is the difference between the two substitute parts?

A: Both substitutes maintain the critical 154V reverse standoff voltage and 400W power rating. The primary differences are: P4SMA180CA specifies 1.6A peak pulse current with a -55 to 150°C operating range, while SMAJP4KE180CA-TP specifies 1.7A peak pulse current with an extended -55 to 175°C operating range. Packaging differs between Tape & Reel and Bulk formats.

Q: Are there any compliance or certification differences?

A: P4SMA180CA carries RoHS compliance certification. SMAJP4KE180CA-TP has REACH unaffected status. Both parts meet the ECCN EAR99 and HTSUS 8541.10.0080 classifications of the original component.

Q: Does the reduced clamping voltage in the substitutes affect circuit protection?

A: The substitute parts reduce maximum clamping voltage from 258.3V to 246V. This lower clamping voltage provides improved protection characteristics for the protected circuit, as transient voltages are clamped to a lower level. This change is beneficial for most applications and does not compromise protection functionality.

Q: Can these parts be used interchangeably in production?

A: Both parts are mechanically and electrically compatible for surface-mount assembly in DO-214AC (SMA) packages. However, packaging format differs: P4SMA180CA is supplied in Tape & Reel format suitable for automated assembly, while SMAJP4KE180CA-TP is supplied in bulk format. Selection should align with your assembly process requirements.

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