P4SMA82C Equivalent & Substitute Parts

Part Overview

The P4SMA82C 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 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 part is currently obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	P4SMA82C
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Voltage - Reverse Standoff (Typ)	70.1V
Voltage - Clamping (Max) @ Ipp	118.65V
Current - Peak Pulse (10/1000µs)	3.6A
Power - Peak Pulse	400W
Package / Case	DO-214AC, SMA
Operating Temperature	-65°C ~ 150°C (TJ)
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the P4SMA82C is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

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) surface mount
Bidirectional Channels: 1
Type: Zener diode

Secondary Compatibility Factors:

Mounting Type: Surface Mount (required)
Moisture Sensitivity Level: 1 (Unlimited)
ECCN and HTSUS classifications match across all substitutes

Substitute parts are grouped into two categories: direct electrical equivalents with minimal parameter variance, and functionally compatible alternatives with acceptable parameter ranges for general-purpose protection applications.

Parameter Comparison

Parameter	P4SMA82C (Littelfuse)	P4SMA82CA (Eaton)	SMAJ70CA (MDD)	SMAJ75CA (Meritek)	SMAJ70CAE3/TR13 (Microchip)	SMAJ75CA-M3/5A (Vishay)	SMAJP4KE82CA-TP (MCC)
Voltage - Reverse Standoff (Typ)	70.1V	70.1V	70V	75V	70V	75V	70.1V
Voltage - Breakdown (Min)	74.01V	77.9V	77.8V	83.3V	77.8V	83.3V	77.9V
Voltage - Clamping (Max) @ Ipp	118.65V	113V	113V	121V	113V	121V	113V
Current - Peak Pulse (10/1000µs)	3.6A	3.6A	4.6A	3.31A	4.4A	3.3A	3.6A
Power - Peak Pulse	400W	400W	400W	400W	500W	400W	400W
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC (SMA)	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Operating Temperature	-65°C ~ 150°C	-55°C ~ 150°C	-50°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 175°C
RoHS Status	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified
Product Status	Obsolete	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Tier 1 - Direct Electrical Equivalents (Preferred):

P4SMA82CA (Eaton - Electronics Division) and SMAJP4KE82CA-TP (Micro Commercial Co) provide the closest electrical match to the P4SMA82C with identical reverse standoff voltage (70.1V), clamping voltage (113V), and peak pulse current (3.6A). Both are active products with full RoHS compliance. P4SMA82CA offers the advantage of higher inventory availability (22,700 pcs) and established telecom application history. SMAJP4KE82CA-TP extends the operating temperature range to 175°C, providing additional thermal margin for demanding environments.

Tier 2 - Compatible Alternatives (70V Standoff):

SMAJ70CA (MDD) and SMAJ70CAE3/TR13 (Microchip Technology) maintain the 70V reverse standoff voltage with 113V clamping voltage. SMAJ70CAE3/TR13 offers superior peak pulse current capability (4.4A versus 4.6A) and increased power dissipation (500W versus 400W), providing enhanced protection margin. This part matches the original P4SMA82C operating temperature range (-65°C to 150°C). Both parts are active with ROHS3 compliance.

Tier 3 - Higher Voltage Alternatives (75V Standoff):

SMAJ75CA (Meritek) and SMAJ75CA-M3/5A (Vishay General Semiconductor) operate at 75V reverse standoff with 121V clamping voltage. These parts are suitable for applications where slightly higher voltage thresholds are acceptable. Both are active products with ROHS3 compliance and established general-purpose protection applications.

Selection Basis:

All substitute parts maintain DO-214AC (SMA) surface-mount packaging for direct PCB compatibility
All parts are active products, ensuring long-term availability and supply chain stability
All parts meet RoHS compliance requirements
Moisture Sensitivity Level 1 (Unlimited) is consistent across all options
ECCN and HTSUS classifications are identical, supporting regulatory compliance

Frequently Asked Questions (FAQ)

Q: Can I directly replace P4SMA82C with P4SMA82CA without circuit modification?

A: Yes. P4SMA82CA is a direct electrical equivalent with identical reverse standoff voltage (70.1V), clamping voltage (113V), and peak pulse current (3.6A). Both use DO-214AC (SMA) packaging. No circuit changes are required.

Q: What is the difference between the 70V and 75V standoff voltage options?

A: The 70V options (SMAJ70CA, SMAJ70CAE3/TR13) maintain closer alignment to the original P4SMA82C specifications. The 75V options (SMAJ75CA, SMAJ75CA-M3/5A) provide a higher voltage threshold before clamping begins, suitable for applications with higher nominal operating voltages. Selection depends on your circuit's protected voltage range.

Q: Why does SMAJ70CAE3/TR13 have higher peak pulse current (4.4A) than the original?

A: SMAJ70CAE3/TR13 is rated for 500W peak pulse power versus 400W in the original P4SMA82C. The higher current rating (4.4A) reflects this increased power dissipation capability, providing additional protection margin without requiring circuit modifications.

Q: Are all substitute parts RoHS compliant?

A: All listed substitutes are RoHS compliant. P4SMA82CA, SMAJ70CA, SMAJ75CA, SMAJ70CAE3/TR13, and SMAJ75CA-M3/5A carry ROHS3 certification. SMAJP4KE82CA-TP does not specify RoHS status in the provided data.

Q: What is the operating temperature range consideration for substitute selection?

A: The original P4SMA82C operates from -65°C to 150°C. SMAJ70CAE3/TR13 matches this range. Most alternatives operate from -50°C to -55°C minimum, which is acceptable for most applications. SMAJP4KE82CA-TP extends to 175°C maximum, providing additional thermal headroom for high-temperature environments.

Q: Can I use these parts interchangeably in production?

A: Yes, within the same tier. Tier 1 parts (P4SMA82CA, SMAJP4KE82CA-TP) are fully interchangeable. Tier 2 and Tier 3 parts require circuit validation to confirm that the voltage and current parameter variations are acceptable for your specific application.

Q: What packaging format should I specify for procurement?

A: All substitutes are available in Tape & Reel (TR) format for automated assembly. Verify your procurement specification matches the supplier device package designation (SMA or DO-214AC (SMA)) to ensure correct component orientation and handling.

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