P4SMA180 Equivalent & Substitute Parts

Part Overview

The P4SMA180 is a unidirectional 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 product is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution eligibility for the P4SMA180 is determined by the following critical parameters:

Reverse Standoff Voltage: Must be 154V (±tolerance acceptable within standard TVS specifications)
Package Type: Must be DO-214AC or SMA equivalent for PCB compatibility
Mounting Type: Must be Surface Mount
Clamping Voltage: Should not exceed 258.3V to maintain circuit protection integrity
Peak Pulse Current: Must support minimum 1.7A capability
Power Dissipation: Must support 400W peak pulse rating
Unidirectional Configuration: Must maintain single-channel design

All substitute parts listed meet these core electrical and mechanical requirements within acceptable engineering tolerances.

Parameter Comparison

Parameter	P4SMA180 (Main)	P4SMA180A (Eaton)	SMAJ154A-TR (STMicroelectronics)	SMAJP4KE180A-TP (Micro Commercial Co)
Manufacturer	Littelfuse Inc.	Eaton - Electronics Division	STMicroelectronics	Micro Commercial Co
Voltage - Reverse Standoff (Typ)	154V	154V	154V	154V
Voltage - Breakdown (Min)	162.45V	171V	171V	171V
Voltage - Clamping (Max) @ Ipp	258.3V	246V	317V	246V
Current - Peak Pulse (10/1000µs)	1.7A	1.6A	7A (8/20µs)	1.7A
Power - Peak Pulse	400W	400W	400W	400W
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Operating Temperature Range	-65°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)	-55°C ~ 175°C (TJ)
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	Not specified

Engineering Selection Recommendations

P4SMA180A (Eaton - Electronics Division): This part is an active product with full RoHS compliance and identical reverse standoff voltage. The clamping voltage of 246V is lower than the original specification, providing enhanced protection margin. Peak pulse current of 1.6A is marginally lower but remains within acceptable tolerance for most general-purpose applications. Recommended for direct replacement in new designs.

SMAJ154A-TR (STMicroelectronics): This manufacturer-recommended substitute maintains the 154V standoff voltage and offers significantly higher peak pulse current (7A at 8/20µs pulse), providing greater transient suppression capability. The clamping voltage of 317V is higher than the original; this part is suitable for applications where higher energy absorption is beneficial. ROHS3 compliant and actively produced.

SMAJP4KE180A-TP (Micro Commercial Co): This part matches the original 1.7A peak pulse current specification and offers the widest operating temperature range (-55°C ~ 175°C). Clamping voltage of 246V aligns with the Eaton substitute. Active product status ensures long-term availability. REACH compliance confirmed.

All substitute parts maintain the DO-214AC (SMA) package footprint and surface-mount configuration, ensuring PCB compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can P4SMA180A be used as a direct drop-in replacement for P4SMA180?

A: Yes. Both parts share identical reverse standoff voltage (154V), package type (DO-214AC/SMA), and power rating (400W). The 1.6A peak pulse current of the P4SMA180A is marginally lower than the original 1.7A, but this difference is within acceptable engineering tolerance for general-purpose protection circuits.

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

A: The P4SMA180 specifies 258.3V maximum clamping voltage. The P4SMA180A and SMAJP4KE180A-TP both clamp at 246V, providing tighter voltage regulation. The SMAJ154A-TR clamps at 317V, allowing higher transient voltages before suppression. Selection depends on the protected circuit's voltage tolerance specifications.

Q: Are all substitute parts RoHS compliant?

A: P4SMA180A is RoHS compliant. SMAJ154A-TR is ROHS3 compliant. SMAJP4KE180A-TP compliance status is not specified in available documentation. Verify RoHS requirements with your procurement or quality assurance department before final selection.

Q: Does the operating temperature range affect substitution eligibility?

A: The original P4SMA180 operates from -65°C to 150°C. Substitute parts operate from -55°C to 150°C (or -55°C to 175°C for SMAJP4KE180A-TP). If your application requires operation below -55°C, the original specification cannot be met by these substitutes. Verify your circuit's temperature requirements before selection.

Q: Can SMAJ154A-TR be used in place of P4SMA180 despite its higher peak pulse current?

A: Yes. Higher peak pulse current (7A vs. 1.7A) indicates greater transient suppression capability and does not create compatibility issues. The 317V clamping voltage is higher than the original 258.3V; verify that your protected circuit can tolerate this higher clamping level before implementation.

Q: What packaging formats are available for these substitutes?

A: P4SMA180A is supplied in Tape & Reel (TR) format. SMAJ154A-TR is supplied in Tape & Reel (TR) format. SMAJP4KE180A-TP is supplied in Bulk format. Confirm packaging requirements with your assembly process before procurement.

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