Equivalent & Substitute Parts for P4SMA22

Part Overview

The P4SMA22 is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features an 18.8V reverse standoff voltage with a 32.13V maximum clamping voltage and 13.4A peak pulse current capability in a DO-214AC (SMA) package.

The P4SMA22 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)	18.8	V
Voltage - Breakdown (Min)	19.86	V
Voltage - Clamping (Max) @ Ipp	32.13	V
Current - Peak Pulse (10/1000µs)	13.4	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 P4SMA22 are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - Reverse Standoff (Typ): 18.8V
Current - Peak Pulse (10/1000µs): 13.4A
Power - Peak Pulse: 400W
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
Type: Zener
Unidirectional Channels: 1

Allowable Variation Parameters:

Voltage - Clamping (Max) @ Ipp: Substitute parts may vary within the range of 30.6V to 32.13V
Voltage - Breakdown (Min): Substitute parts may vary within the range of 19.86V to 20.9V
Operating Temperature Range: Substitute parts must support at least the minimum operating temperature of -55°C and maximum of 150°C

Two substitute parts meet these criteria: P4SMA22A (Eaton - Electronics Division) and SMAJP4KE22A-TP (Micro Commercial Co).

Parameter Comparison

Parameter	P4SMA22 (Littelfuse)	P4SMA22A (Eaton)	SMAJP4KE22A-TP (Micro Commercial Co)
Voltage - Reverse Standoff (Typ)	18.8V	18.8V	18.8V
Voltage - Breakdown (Min)	19.86V	20.9V	20.9V
Voltage - Clamping (Max) @ Ipp	32.13V	30.6V	30.6V
Current - Peak Pulse (10/1000µs)	13.4A	13.4A	13.4A
Power - Peak Pulse	400W	400W	400W
Operating Temperature Range	-65 to 150°C	-55 to 150°C	-55 to 175°C
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Type	Zener	Zener	Zener
Unidirectional Channels	1	1	1
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	RoHS Compliant	REACH Unaffected

Engineering Selection Recommendations

P4SMA22A (Eaton - Electronics Division) is an active product with RoHS compliance. This part maintains identical reverse standoff voltage and peak pulse current specifications. The clamping voltage is 1.53V lower (30.6V vs 32.13V), and the breakdown voltage is 1.04V higher (20.9V vs 19.86V). The operating temperature range is reduced at the lower end (-55°C vs -65°C) but remains adequate for most applications. This part is available in high inventory (18,832 pcs) and is packaged in Tape & Reel format.

SMAJP4KE22A-TP (Micro Commercial Co) is an active product with REACH unaffected status. This part matches all critical electrical parameters with P4SMA22A. The operating temperature range extends to 175°C at the upper limit, providing additional thermal margin. Inventory availability is lower (642 pcs) and packaging is in bulk format. This part is manufacturer-recommended as a substitute.

Both substitute parts are electrically compatible with the original P4SMA22 within the specified parameter tolerances and maintain the same mechanical form factor.

Frequently Asked Questions (FAQ)

Q: Can P4SMA22A be used as a direct replacement for P4SMA22?

A: Yes. P4SMA22A maintains the same reverse standoff voltage (18.8V), peak pulse current (13.4A), and power dissipation (400W). The clamping voltage is 1.53V lower and the breakdown voltage is 1.04V higher, which are within acceptable substitution tolerances for TVS diode applications. Both parts use identical DO-214AC (SMA) packaging.

Q: What is the difference between P4SMA22A and SMAJP4KE22A-TP?

A: Both parts share identical electrical specifications for reverse standoff voltage, breakdown voltage, clamping voltage, peak pulse current, and power dissipation. The primary differences are manufacturer (Eaton vs Micro Commercial Co), operating temperature range (SMAJP4KE22A-TP extends to 175°C), packaging format (Tape & Reel vs Bulk), and inventory availability.

Q: Are there temperature limitations when substituting the P4SMA22?

A: P4SMA22A has a minimum operating temperature of -55°C compared to the original P4SMA22 at -65°C. If your application requires operation below -55°C, P4SMA22A is not suitable. SMAJP4KE22A-TP supports -55°C minimum, matching P4SMA22A. Verify your application's temperature requirements before selection.

Q: Do all substitute parts have the same package?

A: Yes. P4SMA22, P4SMA22A, and SMAJP4KE22A-TP all use DO-214AC (SMA) surface-mount packaging. They are mechanically interchangeable on PCBs designed for the original P4SMA22.

Q: What compliance certifications apply to these parts?

A: P4SMA22 is ROHS3 compliant. P4SMA22A is RoHS compliant. SMAJP4KE22A-TP has REACH unaffected status. All three parts carry EAR99 ECCN classification and 8541.10.0080 HTSUS code.

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