P4SMA10 Equivalent & Substitute Parts

Part Overview

The P4SMA10 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 an 8.55V reverse standoff voltage with a 15.23V maximum clamping voltage and 28.3A peak pulse current capability in a DO-214AC (SMA) package.

The P4SMA10 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	8.55	V
Voltage - Breakdown (Min)	9.03	V
Voltage - Clamping (Max) @ Ipp	15.23	V
Current - Peak Pulse (10/1000µs)	28.3	A
Power - Peak Pulse	400	W
Operating Temperature Range	-65°C to 150°C	TJ
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the P4SMA10 is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 8.5V to 8.55V
Voltage - Clamping (Max) @ Ipp: 14.4V to 19.5V
Current - Peak Pulse (10/1000µs): 27.7A to 124A
Power - Peak Pulse: 400W to 600W
Package / Case: DO-214AC (SMA)
Mounting Type: Surface Mount
Type: Zener, Unidirectional

Substitute parts must maintain the same reverse standoff voltage range and package configuration. Clamping voltage and peak pulse current may vary within acceptable limits for the application. All substitute parts listed are surface-mount Zener diodes in DO-214AC (SMA) packaging with unidirectional channel configuration.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Product Status
P4SMA10	Littelfuse Inc.	8.55V	15.23V	28.3A	400W	-65°C to 150°C	Obsolete
P4SMA10A	Eaton - Electronics Division	8.55V	14.5V	28.3A	400W	-55°C to 150°C	Active
SM4T10AY	STMicroelectronics	8.5V	19.5V	124A (8/20µs)	400W	-55°C to 150°C	Active
SMA6J8.5A-TR	STMicroelectronics	8.5V	18.7V	205A (8/20µs)	600W	-55°C to 175°C	Active
SMAJ8.5A	Meritek	8.5V	14.4V	27.78A	400W	-55°C to 150°C	Active
SMAJ8.5A-E3/5A	Vishay General Semiconductor - Diodes Division	8.5V	14.4V	27.8A	400W	-55°C to 150°C	Active
SMAJ8.5A-TP	Micro Commercial Co	8.5V	14.4V	27.7A	400W	-55°C to 175°C	Active

Engineering Selection Recommendations

Direct Equivalent (Highest Compatibility): P4SMA10A (Eaton - Electronics Division) maintains the identical reverse standoff voltage of 8.55V and equivalent peak pulse current of 28.3A. This part is active and recommended as the primary replacement for obsolete P4SMA10 applications. The clamping voltage is slightly lower at 14.5V, which remains within acceptable operating margins for general-purpose protection circuits.

Alternative Substitutes (Functional Equivalents): SMAJ8.5A, SMAJ8.5A-E3/5A, and SMAJ8.5A-TP all feature 8.5V reverse standoff voltage with 14.4V clamping voltage and peak pulse currents between 27.7A and 27.78A. These parts are functionally equivalent to the P4SMA10 and are actively manufactured. All three are RoHS3 compliant and available in high inventory quantities.

Enhanced Performance Alternatives: SM4T10AY (STMicroelectronics) and SMA6J8.5A-TR (STMicroelectronics) offer higher peak pulse current ratings (124A and 205A respectively) and higher clamping voltages (19.5V and 18.7V). These parts are suitable for applications requiring enhanced transient suppression capability. SMA6J8.5A-TR additionally provides 600W peak pulse power and extended operating temperature range to 175°C.

All substitute parts are RoHS3 compliant, surface-mount DO-214AC (SMA) package, and rated for general-purpose or telecom applications.

Frequently Asked Questions (FAQ)

Q: Can P4SMA10A directly replace P4SMA10? A: Yes. P4SMA10A is the direct equivalent with identical reverse standoff voltage (8.55V) and peak pulse current (28.3A). The slightly lower clamping voltage (14.5V vs 15.23V) is acceptable for general-purpose protection applications.

Q: What is the difference between SMAJ8.5A variants (standard, -E3/5A, -TP)? A: All three variants share identical electrical specifications: 8.5V reverse standoff, 14.4V clamping voltage, and approximately 27.7-27.8A peak pulse current. Differences lie in manufacturer (Meritek, Vishay, Micro Commercial Co) and operating temperature range. SMAJ8.5A-TP extends to 175°C versus 150°C for the others.

Q: Are SM4T10AY and SMA6J8.5A-TR suitable for all P4SMA10 applications? A: These parts are functionally compatible but offer enhanced performance. Higher peak pulse current ratings (124A and 205A) and clamping voltages (19.5V and 18.7V) make them suitable for more demanding transient suppression requirements. Verify application requirements before substitution.

Q: Do all substitute parts use the same package? A: Yes. All substitute parts use DO-214AC (SMA) surface-mount package, ensuring mechanical and electrical compatibility with P4SMA10 PCB layouts.

Q: Are there temperature range considerations for substitution? A: The P4SMA10 operates from -65°C to 150°C. Most substitutes operate from -55°C to 150°C or 175°C. Verify minimum operating temperature requirements for your application. SMA6J8.5A-TR and SMAJ8.5A-TP extend to 175°C maximum.

Q: What compliance certifications apply to these parts? A: All listed substitute parts are RoHS3 compliant. SM4T10AY carries AEC-Q101 automotive qualification. All parts are REACH unaffected or compliant.

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