P4SMA22C Equivalent & Substitute Parts

Part Overview

The P4SMA22C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This bidirectional Zener diode operates with an 18.8V reverse standoff voltage and provides 32.13V clamping at peak pulse current. The part is packaged in DO-214AC (SMA) surface mount configuration and is rated for -65°C to 150°C operating temperature range.

The P4SMA22C is currently listed as obsolete. Equivalent and substitute parts are available from active manufacturers including Eaton, Vishay, STMicroelectronics, and Micro Commercial Co, offering comparable or enhanced electrical performance with current product support and availability.

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	—
Bidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the P4SMA22C is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Voltage - Reverse Standoff (Typ): 18.8V (exact match required)
Voltage - Breakdown (Min): 19.86V to 20.9V (acceptable range)
Voltage - Clamping (Max) @ Ipp: 30.6V to 39.3V (within functional tolerance)
Current - Peak Pulse (10/1000µs): 13.1A to 102A (equal or greater capacity acceptable)
Power - Peak Pulse: 400W to 600W (equal or greater capacity acceptable)

Mechanical Compatibility Criteria:

Package / Case: DO-214AC, SMA (exact match required)
Mounting Type: Surface Mount (exact match required)
Type: Zener (exact match required)
Bidirectional Channels: 1 (exact match required)

Substitute parts meeting these criteria are grouped into two categories: direct electrical equivalents with comparable clamping voltage (30.6V range) and enhanced performance variants with higher current handling (102A) and power dissipation (600W).

Parameter Comparison

Part Number	Manufacturer	VWM (V)	VBR Min (V)	VC Max @ Ipp (V)	Ipp (A)	Power (W)	Temp Range (°C)	Status
P4SMA22C	Littelfuse Inc.	18.8	19.86	32.13	13.4	400	-65 to 150	Obsolete
P4SMA22CA	Eaton - Electronics Division	18.8	20.9	30.6	13.4	400	-55 to 150	Active
P4SMA22CA-E3/5A	Vishay General Semiconductor	18.8	20.9	30.6	13.1	400	-65 to 150	Active
P4SMA22CA-E3/61	Vishay General Semiconductor	18.8	20.9	30.6	13.1	400	-65 to 150	Active
SMA6T22CAY	STMicroelectronics	18.8	20.9	39.3	102	600	-40 to 150	Active
SMAJP4KE22CA-TP	Micro Commercial Co	18.8	20.9	30.6	13.4	400	-55 to 175	Active
SMAJP4KE22CAHE3-TP	Micro Commercial Co	18.8	20.9	30.6	13.4	400	-55 to 175	Active

Engineering Selection Recommendations

Primary Equivalent (Recommended for Direct Replacement):

P4SMA22CA-E3/5A and P4SMA22CA-E3/61 from Vishay General Semiconductor are the preferred substitutes. Both parts maintain the full operating temperature range of the original P4SMA22C (-65°C to 150°C), are RoHS3 compliant, and provide identical electrical performance with 30.6V clamping voltage and 13.1A peak pulse current. These parts are actively manufactured and widely available.

Alternative Equivalent (Active Product Status):

P4SMA22CA from Eaton - Electronics Division is an active manufacturer-recommended equivalent with identical electrical specifications (30.6V clamping, 13.4A peak pulse current, 400W power rating). The operating temperature range is -55°C to 150°C, which is acceptable for most applications not requiring the full -65°C lower limit. This part offers high inventory availability.

Enhanced Performance Option:

SMA6T22CAY from STMicroelectronics provides superior transient protection with 102A peak pulse current (8/20µs) and 600W power dissipation, compared to 13.4A and 400W in the original part. This device is AEC-Q101 qualified for automotive applications and maintains the 18.8V standoff voltage. The operating temperature range is -40°C to 150°C. Selection of this part is appropriate when enhanced surge protection capability is required.

Extended Temperature Range Option:

SMAJP4KE22CA-TP and SMAJP4KE22CAHE3-TP from Micro Commercial Co extend the upper operating temperature to 175°C while maintaining -55°C lower limit. The SMAJP4KE22CAHE3-TP variant includes AEC-Q101 automotive qualification. Both parts provide 30.6V clamping and 13.4A peak pulse current.

Frequently Asked Questions (FAQ)

Q: Can P4SMA22CA directly replace P4SMA22C?

A: Yes. P4SMA22CA from Eaton maintains the critical electrical parameters: 18.8V reverse standoff voltage, 30.6V clamping voltage, 13.4A peak pulse current, and 400W power rating. The package (DO-214AC SMA) and mounting type are identical. The operating temperature range is -55°C to 150°C versus -65°C to 150°C in the original; verify your application does not require operation below -55°C.

Q: What is the difference between P4SMA22CA-E3/5A and P4SMA22CA-E3/61?

A: Both Vishay parts are electrically identical with 18.8V standoff voltage, 30.6V clamping, and 13.1A peak pulse current. The designations E3/5A and E3/61 represent different manufacturing date codes and packaging configurations. Both are RoHS3 compliant and support the full -65°C to 150°C temperature range. Selection between them depends on packaging availability and supply chain requirements.

Q: When should SMA6T22CAY be selected instead of direct equivalents?

A: SMA6T22CAY is appropriate when the application requires enhanced transient suppression capability. This part provides 102A peak pulse current and 600W power dissipation compared to 13.4A and 400W in standard equivalents. The higher current rating provides superior protection against high-energy transient events. The -40°C to 150°C operating range and AEC-Q101 automotive qualification make this part suitable for demanding automotive and industrial applications.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are RoHS3 compliant or RoHS compliant, meeting environmental and regulatory requirements equivalent to or exceeding the original P4SMA22C specification.

Q: What is the impact of clamping voltage differences (30.6V vs 32.13V vs 39.3V)?

A: Clamping voltage determines the maximum voltage the TVS diode allows across the protected circuit during a transient event. The P4SMA22C clamps at 32.13V maximum. Equivalents clamping at 30.6V provide slightly tighter voltage regulation. SMA6T22CAY at 39.3V provides looser clamping but with significantly higher current handling. Selection depends on the protected circuit's voltage tolerance specifications.

Q: Can SMAJP4KE22CA-TP be used in applications requiring -65°C operation?

A: No. SMAJP4KE22CA-TP operates from -55°C to 175°C. If your application requires operation at -65°C, select P4SMA22CA-E3/5A, P4SMA22CA-E3/61, or SMA6T22CAY, which all support -65°C minimum operating temperature.

Q: Is package compatibility guaranteed across all substitutes?

A: Yes. All substitute parts use DO-214AC (SMA) surface mount package. Physical dimensions and PCB footprints are identical, ensuring direct mechanical compatibility without layout modifications.

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