P4SMA16 Equivalent & Substitute Parts

Part Overview

The P4SMA16 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose transient voltage protection in surface-mount applications. This component features a 13.6V reverse standoff voltage and 23.63V maximum clamping voltage with 18.2A peak pulse current capability in a DO-214AC (SMA) package.

The P4SMA16 is classified as obsolete. Equivalent and substitute parts are available from active manufacturers including Eaton Electronics Division, Vishay General Semiconductor, and Micro Commercial Co, offering comparable electrical performance with improved availability and active product support.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	13.6	V
Voltage - Breakdown (Min)	14.44	V
Voltage - Clamping (Max) @ Ipp	23.63	V
Current - Peak Pulse (10/1000µs)	18.2	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

Substitution of the P4SMA16 is determined by strict equivalence across the following critical parameters:

Voltage - Reverse Standoff (Typ): 13.6V
Voltage - Clamping (Max) @ Ipp: 22.5V to 23.63V range
Current - Peak Pulse (10/1000µs): 17.8A to 18.2A range
Power - Peak Pulse: 400W
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
Type: Zener, Unidirectional (1 channel)

All substitute parts listed maintain these core electrical specifications within acceptable engineering tolerances. Substitute parts P4SMA16A (Eaton), P4SMA16A-M3/61 (Vishay), and SMAJP4KE16A-TP (Micro Commercial Co) meet these criteria and are classified as active products with full manufacturer support.

Parameter Comparison

Parameter	P4SMA16 (Littelfuse)	P4SMA16A (Eaton)	P4SMA16A-M3/61 (Vishay)	SMAJP4KE16A-TP (MCC)
Voltage - Reverse Standoff (Typ)	13.6V	13.6V	13.6V	13.6V
Voltage - Breakdown (Min)	14.44V	15.2V	15.2V	15.2V
Voltage - Clamping (Max) @ Ipp	23.63V	22.5V	22.5V	22.5V
Current - Peak Pulse (10/1000µs)	18.2A	18.2A	17.8A	18.2A
Power - Peak Pulse	400W	400W	400W	400W
Operating Temperature Range	-65 to 150°C	-55 to 150°C	-65 to 150°C	-55 to 175°C
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Type	Zener	Zener	Zener	Zener
Unidirectional Channels	1	1	1	1
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	Not specified

Engineering Selection Recommendations

All three substitute parts are classified as active products with current manufacturer support, addressing the obsolescence status of the P4SMA16.

P4SMA16A (Eaton Electronics Division) maintains full electrical equivalence with 18.2A peak pulse current and 22.5V clamping voltage. This part is RoHS compliant and available in high inventory (66,455 pcs). Operating temperature range is -55 to 150°C, which is suitable for most general-purpose applications.

P4SMA16A-M3/61 (Vishay General Semiconductor) offers the widest operating temperature range (-65 to 150°C), matching the original P4SMA16 specification. Peak pulse current is 17.8A, slightly lower than the original 18.2A but within acceptable tolerance for equivalent protection. This part is ROHS3 compliant and supplied in Tape & Reel packaging. Inventory availability is 1,085 pcs.

SMAJP4KE16A-TP (Micro Commercial Co) provides the highest operating temperature ceiling at -55 to 175°C. Peak pulse current matches the original at 18.2A with 22.5V clamping voltage. This part is available in bulk packaging with 636 pcs in stock.

Selection should be based on specific application requirements: temperature range constraints, packaging preference (Tape & Reel vs. Bulk), and inventory availability.

Frequently Asked Questions (FAQ)

Q: Can P4SMA16A be used as a direct replacement for P4SMA16?

A: Yes. Both parts share identical reverse standoff voltage (13.6V), peak pulse current (18.2A), and power dissipation (400W). Clamping voltage differs by 1.13V (23.63V vs. 22.5V), which is within acceptable engineering tolerance for TVS diode substitution. Both use DO-214AC (SMA) surface-mount packaging.

Q: What is the difference between P4SMA16A from Eaton and P4SMA16A-M3/61 from Vishay?

A: Both parts are electrically equivalent with 13.6V standoff voltage and 22.5V clamping voltage. The primary differences are: Vishay part has lower peak pulse current (17.8A vs. 18.2A), wider operating temperature range (-65 to 150°C vs. -55 to 150°C), and is supplied in Tape & Reel packaging. Eaton part has higher inventory availability.

Q: Is SMAJP4KE16A-TP compatible with the original P4SMA16 footprint?

A: Yes. SMAJP4KE16A-TP uses the same DO-214AC (SMA) surface-mount package as the P4SMA16, ensuring mechanical and electrical compatibility on PCB layouts.

Q: What are the key parameters that determine if a TVS diode can substitute for P4SMA16?

A: Critical parameters are: reverse standoff voltage (13.6V), clamping voltage (22.5V to 23.63V range), peak pulse current (17.8A to 18.2A range), power dissipation (400W), and DO-214AC (SMA) package. All substitute parts meet these specifications.

Q: Does operating temperature range affect substitution suitability?

A: Operating temperature range does not prevent substitution but should be verified against application requirements. P4SMA16A-M3/61 matches the original -65 to 150°C range. Eaton and MCC parts operate at -55°C minimum, which is acceptable for most industrial and commercial applications but may not suit extreme cold environments.

Q: Are all substitute parts RoHS compliant?

A: P4SMA16A (Eaton) and P4SMA16A-M3/61 (Vishay) are explicitly RoHS compliant. SMAJP4KE16A-TP (MCC) compliance status is not specified in available documentation.

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