P4SMA8.2 Equivalent & Substitute Parts

Part Overview

The P4SMA8.2 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features a 7.02V reverse standoff voltage, 12.71V maximum clamping voltage, and 33.9A peak pulse current capability in a DO-214AC (SMA) package. The P4SMA8.2 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production and field replacements.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	7.02	V
Voltage - Breakdown (Min)	7.4	V
Voltage - Clamping (Max) @ Ipp	12.71	V
Current - Peak Pulse (10/1000µs)	33.9	A
Power - Peak Pulse	400	W
Operating Temperature Range	-65 to 150	°C (TJ)
Package / Case	DO-214AC, SMA	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the P4SMA8.2 is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): Must remain within the 7.02V specification to maintain circuit protection thresholds
Voltage - Clamping (Max) @ Ipp: Must not exceed 12.71V to ensure adequate transient suppression
Current - Peak Pulse (10/1000µs): Must meet or exceed 33.9A to handle the specified pulse energy
Power - Peak Pulse: Must support 400W minimum dissipation
Package / Case: Must be DO-214AC (SMA) for mechanical and electrical compatibility
Type: Must be Zener unidirectional TVS diode
Operating Temperature Range: Must support the required thermal operating window

Substitute parts are grouped into two categories:

Direct Equivalents: Parts with identical or near-identical electrical specifications and active product status (P4SMA8.2A from Taiwan Semiconductor Corporation).

Functional Alternatives: Parts with comparable voltage and current ratings within acceptable tolerance bands, offering equivalent circuit protection performance (SMAJ6.0A, SMAJ6.5A, SMAJ7.0A, SMA6J6.0A-TP, SMAJ7.0A-13-F, SMAJ7.0A-E3/61, SMAJP4KE6.8A-TP).

Parameter Comparison

Part Number	Manufacturer	VWM (Typ) [V]	VBR (Min) [V]	VC (Max) @ Ipp [V]	Ipp (10/1000µs) [A]	Power [W]	Temp Range [°C]	Status
P4SMA8.2	Littelfuse Inc.	7.02	7.4	12.71	33.9	400	-65 to 150	Obsolete
P4SMA8.2A	Taiwan Semiconductor Corporation	7.02	7.79	12.1	34	400	-55 to 150	Active
SMAJ6.0A	MDD	6	6.67	10.3	38.8	400	-50 to 150	Active
SMAJ6.5A	MDD	6.5	7.22	11.2	35.7	400	-50 to 150	Active
SMAJ7.0A	MDD	7	7.78	12	33.3	400	-50 to 150	Active
SMA6J6.0A-TP	Micro Commercial Co	6	6.67	10.3	58.3	600	-55 to 175	Active
SMAJ7.0A-13-F	Diodes Incorporated	7	7.78	12	33.3	400	-55 to 150	Active
SMAJ7.0A-E3/61	Vishay General Semiconductor - Diodes Division	7	7.78	12	33.3	400	-55 to 150	Active
SMAJP4KE6.8A-TP	Micro Commercial Co	5.8	6.45	10.5	39	400	-55 to 175	Active

Engineering Selection Recommendations

Primary Recommendation: P4SMA8.2A (Taiwan Semiconductor Corporation) is the direct equivalent with active product status. It maintains the 7.02V reverse standoff voltage and 400W power rating while offering improved availability and REACH compliance documentation.

Secondary Recommendations: SMAJ7.0A-13-F (Diodes Incorporated) and SMAJ7.0A-E3/61 (Vishay) provide functionally equivalent protection with 7V reverse standoff voltage, 12V clamping voltage, and 33.3A peak pulse current. Both are active products with ROHS3 compliance and extended temperature range support (-55°C to 150°C).

Extended Temperature Applications: SMA6J6.0A-TP (Micro Commercial Co) and SMAJP4KE6.8A-TP (Micro Commercial Co) support operating temperatures to 175°C and offer higher peak pulse current ratings (58.3A and 39A respectively), suitable for high-reliability or elevated-temperature environments.

Lower Voltage Tolerance Applications: SMAJ6.0A and SMAJ6.5A (MDD) provide alternative voltage ratings (6V and 6.5V standoff) with comparable clamping and current specifications, applicable where circuit design permits lower protection thresholds.

All substitute parts are ROHS3 compliant and available in DO-214AC (SMA) surface-mount packaging, ensuring mechanical compatibility with the original P4SMA8.2 footprint.

Frequently Asked Questions (FAQ)

Q: Can P4SMA8.2A directly replace P4SMA8.2 in existing designs?

A: Yes. P4SMA8.2A maintains identical reverse standoff voltage (7.02V) and power rating (400W). The clamping voltage is slightly lower (12.1V vs. 12.71V), which provides equivalent or improved transient suppression. Operating temperature range is -55°C to 150°C versus the original -65°C to 150°C; verify minimum temperature requirements for your application.

Q: What is the difference between SMAJ7.0A variants from different manufacturers?

A: SMAJ7.0A-13-F (Diodes Incorporated) and SMAJ7.0A-E3/61 (Vishay) are functionally identical with 7V reverse standoff, 12V clamping, and 33.3A peak pulse current. Differences are in packaging format (Tape & Reel vs. Cut Tape & Digi-Reel) and manufacturer-specific part numbering. Both are active products with full compliance documentation.

Q: Are higher peak pulse current ratings (58.3A) compatible with the original circuit?

A: Higher peak pulse current capability does not create incompatibility. SMA6J6.0A-TP (58.3A, 600W) provides superior transient energy absorption. Verify that the lower 6V reverse standoff voltage meets your circuit protection requirements, as this is the primary electrical difference from the P4SMA8.2.

Q: What packaging considerations apply to these substitutes?

A: All listed substitutes use DO-214AC (SMA) surface-mount packaging, ensuring footprint compatibility with P4SMA8.2 PCB layouts. Verify tape format (Tape & Reel, Bulk, or Cut Tape) matches your procurement and assembly process requirements.

Q: Which substitute offers the widest operating temperature range?

A: SMA6J6.0A-TP and SMAJP4KE6.8A-TP (both Micro Commercial Co) support -55°C to 175°C, extending the upper temperature limit by 25°C compared to the original P4SMA8.2 (-65°C to 150°C). These are suitable for high-reliability or thermally demanding applications.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification. Verify REACH compliance status with your supplier if required for specific markets or applications.

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