P4SMA82 Equivalent & Substitute Parts

Part Overview

The P4SMA82 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features a 70.1V reverse standoff voltage with a 118.65V maximum clamping voltage and 3.6A peak pulse current capability in a DO-214AC (SMA) package. The P4SMA82 is currently obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	70.1	V
Voltage - Breakdown (Min)	74.01	V
Voltage - Clamping (Max) @ Ipp	118.65	V
Current - Peak Pulse (10/1000µs)	3.6	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	-
Unidirectional Channels	1	-

Substitute Part Grouping Explanation

Substitute parts for the P4SMA82 are qualified based on the following critical parameters:

Voltage - Reverse Standoff (Typ): 70V to 75V range
Voltage - Clamping (Max) @ Ipp: 113V to 121V range
Current - Peak Pulse (10/1000µs): 3.3A to 4.4A range
Power - Peak Pulse: 400W to 500W
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
Type: Zener, Unidirectional

Parts meeting these electrical and mechanical criteria are functionally equivalent for general-purpose transient voltage suppression applications. Variations within these ranges reflect manufacturing tolerances and different product lines from multiple manufacturers.

Parameter Comparison

Part Number	Manufacturer	VWM (Typ) V	Vc (Max) @ Ipp V	Ipp (10/1000µs) A	Power W	Temp Range °C	Status	Package
P4SMA82	Littelfuse Inc.	70.1	118.65	3.6	400	-65 to 150	Obsolete	DO-214AC, SMA
P4SMA82A	Eaton - Electronics Division	70.1	113	3.6	400	-55 to 150	Active	DO-214AC, SMA
SMAJ75A	MDD	75	121	3.3	400	-50 to 150	Active	DO-214AC, SMA
SMAJ70A	MDD	70	113	4.6	400	-50 to 150	Active	DO-214AC, SMA
SMAJ70A-M3/5A	Vishay General Semiconductor - Diodes Division	70	113	4.6	400	-55 to 150	Active	DO-214AC, SMA
SMAJ70AE3/TR13	Microchip Technology	70	113	4.4	500	-65 to 150	Active	DO-214AC, SMA
SMAJ75A-M3/61	Vishay General Semiconductor - Diodes Division	75	121	3.3	400	-55 to 150	Active	DO-214AC, SMA
SMAJP4KE82A-TP	Micro Commercial Co	70.1	113	3.6	400	-55 to 175	Active	DO-214AC, SMA

Engineering Selection Recommendations

All substitute parts listed are active products with current manufacturing status, ensuring long-term availability compared to the obsolete P4SMA82. Selection should prioritize parts with RoHS3 compliance and REACH unaffected status for regulatory alignment.

P4SMA82A (Eaton) and SMAJP4KE82A-TP (Micro Commercial Co) provide the closest electrical match to the original P4SMA82, maintaining identical reverse standoff voltage (70.1V) and peak pulse current (3.6A) specifications. Both are available in high inventory quantities.

SMAJ70A-M3/5A (Vishay) and SMAJ70AE3/TR13 (Microchip) offer equivalent performance with 70V reverse standoff voltage and 113V clamping voltage. SMAJ70AE3/TR13 provides enhanced peak pulse current (4.4A) and power dissipation (500W), suitable for applications requiring higher transient energy absorption.

SMAJ75A and SMAJ75A-M3/61 (MDD and Vishay respectively) feature slightly elevated reverse standoff voltage (75V) and clamping voltage (121V), appropriate for applications with higher voltage margins.

All substitute parts maintain DO-214AC (SMA) surface-mount packaging, ensuring mechanical compatibility with existing PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can P4SMA82A directly replace P4SMA82 in existing designs?

A: Yes. P4SMA82A maintains identical reverse standoff voltage (70.1V) and peak pulse current (3.6A) specifications. The primary difference is lower clamping voltage (113V vs 118.65V), which remains within acceptable operating margins for general-purpose transient suppression. P4SMA82A is an active product with superior availability.

Q: What is the difference between SMAJ70A and SMAJ75A substitutes?

A: SMAJ70A features 70V reverse standoff voltage and 113V clamping voltage. SMAJ75A features 75V reverse standoff voltage and 121V clamping voltage. Selection depends on circuit voltage requirements. SMAJ70A is closer to the original P4SMA82 specification; SMAJ75A provides higher voltage margin.

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

A: Yes. All substitute parts use DO-214AC (SMA) surface-mount packaging, ensuring direct mechanical compatibility with P4SMA82 PCB footprints without layout modifications.

Q: Which substitute offers the best thermal performance?

A: SMAJ70AE3/TR13 (Microchip) provides the highest power dissipation rating (500W) and peak pulse current (4.4A), offering superior thermal headroom for high-energy transient events. Operating temperature range extends to -65°C, matching the original P4SMA82.

Q: What compliance certifications should I verify for production use?

A: Confirm RoHS3 compliance and REACH unaffected status for all substitute parts. All listed alternatives meet these regulatory requirements, ensuring compliance with current environmental and hazardous substance directives.

Q: Can SMAJ75A-M3/61 be used in place of P4SMA82?

A: Yes, with voltage margin consideration. SMAJ75A-M3/61 features higher reverse standoff voltage (75V vs 70.1V) and clamping voltage (121V vs 118.65V). This part is suitable for applications where additional voltage protection margin is beneficial or required.

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