P4SMA13 Equivalent & Substitute Parts

Part Overview

The P4SMA13 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection in surface-mount applications. The device features an 11.1V reverse standoff voltage and 19.11V maximum clamping voltage with 22.5A peak pulse current capability in a DO-214AC (SMA) package.

The P4SMA13 is classified as obsolete. Equivalent and substitute parts are available from active product lines that maintain compatible electrical and mechanical specifications, enabling direct replacement in existing designs without circuit modification.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	11.1V	V
Voltage - Breakdown (Min)	11.78V	V
Voltage - Clamping (Max) @ Ipp	19.11V	V
Current - Peak Pulse (10/1000µs)	22.5A	A
Power - Peak Pulse	400W	W
Operating Temperature Range	-65°C to 150°C	°C (TJ)
Package / Case	DO-214AC (SMA)	—
Mounting Type	Surface Mount	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the P4SMA13 is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): Must be 11.0V to 11.1V
Voltage - Clamping (Max) @ Ipp: Must be 18.2V to 19.11V
Current - Peak Pulse (10/1000µs): Must be ≥ 21.98A
Power - Peak Pulse: Must be ≥ 400W
Package / Case: Must be DO-214AC (SMA)
Mounting Type: Must be Surface Mount
Type: Must be Zener
Unidirectional Channels: Must be 1

All substitute parts listed below meet these electrical and mechanical compatibility criteria and are available from active product lines.

Parameter Comparison

Parameter	P4SMA13 (Littelfuse)	P4SMA13A (Eaton)	SMAJ11A (Meritek)	SMAJ11AE3/TR13 (Microchip)	SMAJP4KE13A-TP (MCC)
Voltage - Reverse Standoff (Typ)	11.1V	11.1V	11.0V	11.0V	11.1V
Voltage - Breakdown (Min)	11.78V	12.4V	12.2V	12.2V	12.4V
Voltage - Clamping (Max) @ Ipp	19.11V	18.2V	18.2V	18.2V	18.2V
Current - Peak Pulse (10/1000µs)	22.5A	22.5A	21.98A	27.4A	22.5A
Power - Peak Pulse	400W	400W	400W	500W	400W
Operating Temperature Range	-65°C to 150°C	-55°C to 150°C	-55°C to 150°C	-65°C to 150°C	-55°C to 175°C
Package / Case	DO-214AC (SMA)	DO-214AC (SMA)	DO-214AC (SMA)	DO-214AC (SMA)	DO-214AC (SMA)
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified

Engineering Selection Recommendations

P4SMA13A (Eaton - Electronics Division) is the direct equivalent substitute. It maintains identical reverse standoff voltage (11.1V), peak pulse current (22.5A), and power rating (400W) with marginally lower clamping voltage (18.2V vs. 19.11V). The part is active and RoHS compliant. Operating temperature range is -55°C to 150°C, which is narrower than the original at the lower end.

SMAJ11AE3/TR13 (Microchip Technology) offers enhanced performance with 27.4A peak pulse current and 500W power rating, providing additional margin for transient protection. Operating temperature range matches the original (-65°C to 150°C). Clamping voltage is 18.2V. This part is active and ROHS3 compliant.

SMAJP4KE13A-TP (Micro Commercial Co) maintains electrical specifications identical to P4SMA13A with extended upper operating temperature to 175°C. This part is active and suitable for high-temperature applications.

SMAJ11A (Meritek) provides equivalent protection with 21.98A peak pulse current and 400W power rating. Operating temperature range is -55°C to 150°C. This part is active and ROHS3 compliant.

Selection should prioritize active product status and compliance certifications. For applications requiring the original -65°C lower temperature limit, SMAJ11AE3/TR13 or the original P4SMA13 specifications should be specified. For standard operating ranges, P4SMA13A provides direct substitution.

Frequently Asked Questions (FAQ)

Q: Can P4SMA13A directly replace P4SMA13 in existing designs?

A: Yes. P4SMA13A maintains the same reverse standoff voltage (11.1V), peak pulse current (22.5A), power rating (400W), and DO-214AC (SMA) package. The clamping voltage is slightly lower (18.2V vs. 19.11V), which provides adequate protection in most applications. Verify that the lower clamping voltage is acceptable for your specific circuit protection requirements.

Q: What is the difference between SMAJ11A and SMAJ11AE3/TR13?

A: Both parts share the same electrical specifications (11.0V standoff, 18.2V clamping, 400W power). SMAJ11AE3/TR13 offers higher peak pulse current (27.4A vs. 21.98A) and higher power rating (500W vs. 400W), providing greater transient protection margin. SMAJ11AE3/TR13 also maintains the -65°C lower operating temperature limit, matching the original P4SMA13.

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

A: Yes. All substitute parts are supplied in DO-214AC (SMA) surface-mount package, ensuring mechanical compatibility with existing PCB layouts and assembly processes.

Q: Which substitute part has the widest operating temperature range?

A: SMAJP4KE13A-TP offers the widest operating temperature range (-55°C to 175°C), making it suitable for high-temperature applications. SMAJ11AE3/TR13 matches the original P4SMA13 range (-65°C to 150°C) at the lower end.

Q: Are all substitute parts RoHS compliant?

A: P4SMA13A, SMAJ11A, and SMAJ11AE3/TR13 are confirmed RoHS compliant. SMAJP4KE13A-TP RoHS status is not specified in available documentation.

Q: What is the inventory status of these substitute parts?

A: P4SMA13A (Eaton) has 10,200 units in stock. SMAJ11A (Meritek) has 45,300 units. SMAJ11AE3/TR13 (Microchip) has 765 units. SMAJP4KE13A-TP (MCC) has 831 units. Availability should be confirmed with your component supplier for production requirements.

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