P4SMA100C Equivalent & Substitute Parts

Part Overview

The P4SMA100C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose overvoltage protection in surface-mount applications. This component features an 85.5V reverse standoff voltage with a 143.85V maximum clamping voltage and 3A peak pulse current capability in a DO-214AC (SMA) package. The part is currently obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	P4SMA100C
Manufacturer	Littelfuse
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Voltage - Reverse Standoff (Typ)	85.5V
Voltage - Breakdown (Min)	90.25V
Voltage - Clamping (Max) @ Ipp	143.85V
Current - Peak Pulse (10/1000µs)	3A
Power - Peak Pulse	400W
Package / Case	DO-214AC, SMA
Mounting Type	Surface Mount
Operating Temperature	-65°C ~ 150°C (TJ)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the P4SMA100C is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 85V to 85.5V
Voltage - Clamping (Max) @ Ipp: 137V to 143.85V
Current - Peak Pulse (10/1000µs): 2.92A to 3.6A
Power - Peak Pulse: 400W to 500W
Package / Case: DO-214AC (SMA)
Mounting Type: Surface Mount
Type: Zener, Bidirectional, Single Channel

All substitute parts listed maintain compatibility within these electrical and mechanical boundaries. Substitutes are grouped by active product status and compliance certifications.

Parameter Comparison

Parameter	P4SMA100C (Littelfuse)	P4SMA100CA (Eaton)	SMAJ85CA (Meritek)	SMAJ85CAE3/TR13 (Microchip)	SMAJP4KE100CA-TP (MCC)
Voltage - Reverse Standoff (Typ)	85.5V	85.5V	85V	85V	85.5V
Voltage - Breakdown (Min)	90.25V	95V	94.4V	94.4V	95V
Voltage - Clamping (Max) @ Ipp	143.85V	137V	137V	137V	137V
Current - Peak Pulse (10/1000µs)	3A	3A	2.92A	3.6A	3A
Power - Peak Pulse	400W	400W	400W	500W	400W
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC (SMA)	DO-214AC, SMA	DO-214AC, SMA
Operating Temperature	-65°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)	-55°C ~ 150°C	-65°C ~ 150°C (TJ)	-55°C ~ 175°C (TJ)
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified

Engineering Selection Recommendations

Primary Substitute: P4SMA100CA (Eaton - Electronics Division)

The P4SMA100CA is the manufacturer-recommended substitute. It maintains identical reverse standoff voltage (85.5V), peak pulse current (3A), and power dissipation (400W) as the original P4SMA100C. The clamping voltage is 137V versus 143.85V on the original, representing a 4.8% reduction within acceptable design margins. This part is active, RoHS compliant, and available in high volume (22,400 pcs in stock).

Secondary Substitute: SMAJ85CAE3/TR13 (Microchip Technology)

This part offers the highest peak pulse current capability (3.6A) and power dissipation (500W) among all substitutes, providing additional margin for transient protection. It maintains the 85V reverse standoff voltage and 137V clamping voltage. The part is active, ROHS3 compliant, and supports the full operating temperature range of the original (-65°C to 150°C). Limited inventory (809 pcs) may affect availability for high-volume applications.

Tertiary Substitute: SMAJP4KE100CA-TP (Micro Commercial Co)

This part matches the original specifications for reverse standoff voltage (85.5V), peak pulse current (3A), and clamping voltage (137V). It extends the upper operating temperature to 175°C, providing additional thermal margin. Inventory availability is moderate (634 pcs).

Alternative Substitute: SMAJ85CA (Meritek)

The SMAJ85CA provides the highest inventory availability (37,100 pcs) and is ROHS3 compliant. The peak pulse current is slightly lower at 2.92A compared to 3A on the original, representing a 2.7% reduction. This part is suitable for applications where current margin is not critical.

Frequently Asked Questions (FAQ)

Q: Can P4SMA100CA directly replace P4SMA100C without circuit modifications?

A: Yes. The P4SMA100CA maintains the same reverse standoff voltage (85.5V), peak pulse current (3A), and package (DO-214AC SMA). The clamping voltage is 137V versus 143.85V on the original, a difference of 6.85V that falls within typical design tolerances for TVS applications.

Q: What is the difference between the clamping voltages across substitute parts?

A: All substitutes clamp at 137V except the original P4SMA100C at 143.85V. This 6.85V difference represents the maximum variation. For circuits designed with the original 143.85V specification, the lower clamping voltage of substitutes provides additional protection margin.

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

A: Yes. All substitute parts use the DO-214AC (SMA) surface-mount package, ensuring mechanical and electrical compatibility with existing PCB layouts.

Q: Which substitute offers the best thermal performance?

A: SMAJP4KE100CA-TP extends the upper operating temperature to 175°C compared to 150°C on the original and most substitutes. SMAJ85CAE3/TR13 maintains the full -65°C to 150°C range of the original.

Q: What is the inventory status of each substitute?

A: P4SMA100CA (Eaton) has the highest availability at 22,400 pcs. SMAJ85CA (Meritek) offers 37,100 pcs. SMAJP4KE100CA-TP (MCC) has 634 pcs, and SMAJ85CAE3/TR13 (Microchip) has 809 pcs available.

Q: Are all substitutes RoHS compliant?

A: P4SMA100CA is RoHS compliant. SMAJ85CA, SMAJ85CAE3/TR13, and the original P4SMA100C are ROHS3 compliant. SMAJP4KE100CA-TP does not specify RoHS status in the provided data.

Q: Which substitute has the highest power dissipation capability?

A: SMAJ85CAE3/TR13 (Microchip) offers 500W peak pulse power compared to 400W on the original and most other substitutes, providing additional transient energy handling capacity.

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