P4SMA36A Equivalent & Substitute Parts

Part Overview

The P4SMA36A is an active Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This unidirectional Zener diode operates with a reverse standoff voltage of 30.8V and provides clamping protection at 49.9V with peak pulse current handling of 8.2A. The component is packaged in DO-214AC (SMA) format and is RoHS3 compliant with unlimited moisture sensitivity rating. Equivalent and substitute parts are identified based on matching electrical performance parameters and mechanical compatibility within the TVS diode category.

Substiute Parts

P4SMA36A

Littelfuse Inc.In Stock: 30451P4SMA36A Datasheet

Current PartRFQ

P4SMA36A

Eaton - Electronics DivisionIn Stock: 30448P4SMA36A Datasheet

MFR RecommendedRFQ

P4SMA36A

Eaton - Electronics DivisionIn Stock: 30448P4SMA36A Datasheet

MFR RecommendedRFQ

SMAJ36A-TP

Micro Commercial CoIn Stock: 4588SMAJ36A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of TVS diodes is determined by electrical parameter compatibility within defined tolerance bands. The primary substitution criteria for the P4SMA36A are:

Critical Parameters for Substitution:

• Reverse standoff voltage within acceptable range (30.8V nominal)
• Clamping voltage at peak pulse current (49.9V maximum)
• Peak pulse current capability (8.2A minimum)
• Package compatibility (DO-214AC/SMA surface mount)
• Unidirectional channel configuration (1 channel)

Identified Substitute Groups:

Group 1: Direct Electrical Equivalents Parts matching all critical electrical parameters with identical or superior performance characteristics and compatible packaging.

Group 2: Parameter Variants Parts with differing voltage or current specifications that fall outside direct equivalence but share the same package and general application category.

Parameter Comparison

Engineering Selection Recommendations

P4SMA36A (Eaton - Electronics Division)

This part is a direct electrical equivalent to the primary P4SMA36A (Littelfuse) specification. Both components share identical voltage ratings (30.8V reverse standoff, 49.9V clamping), current handling (8.2A peak pulse), and package format (DO-214AC/SMA). The Eaton variant is RoHS compliant and maintains the same MSL rating. The operating temperature range differs slightly (-55°C to 150°C versus -65°C to 150°C), which may be relevant for applications requiring extended low-temperature performance. Both parts are active products with established supply chains.

SMAJ36A-TP (Micro Commercial Co)

This part operates at a higher voltage class with 36V reverse standoff and 58.1V clamping voltage, compared to the 30.8V and 49.9V specifications of the P4SMA36A. Peak pulse current is reduced to 6.9A versus 8.2A. The SMAJ36A-TP is suitable only for applications where the higher voltage ratings are acceptable and the lower current capability does not compromise circuit protection requirements. This part is RoHS3 compliant and supports an extended operating temperature range to 175°C. Package compatibility (DO-214AC/SMA) is maintained.

Frequently Asked Questions (FAQ)

Q: Can the P4SMA36A (Eaton) be used as a direct replacement for the P4SMA36A (Littelfuse)?

A: Yes. Both parts share identical electrical specifications: 30.8V reverse standoff voltage, 49.9V clamping voltage, and 8.2A peak pulse current. Package format (DO-214AC/SMA) and compliance certifications are compatible. The minor difference in operating temperature range (-55°C to 150°C versus -65°C to 150°C) is application-dependent.

Q: Is the SMAJ36A-TP a suitable substitute for the P4SMA36A?

A: The SMAJ36A-TP is not a direct substitute. It operates at higher voltage levels (36V standoff, 58.1V clamping) and lower peak pulse current (6.9A). Substitution is only valid if the circuit design accommodates these parameter differences and the higher voltage ratings do not cause overvoltage conditions in the protected circuit.

Q: What are the critical parameters that must match for TVS diode substitution?

A: Critical parameters include reverse standoff voltage, clamping voltage at peak pulse current, peak pulse current capability, and package format. Deviations in these parameters alter circuit protection characteristics and may result in inadequate overvoltage suppression or component failure.

Q: Are all listed parts RoHS compliant?

A: The P4SMA36A (Littelfuse) and SMAJ36A-TP (Micro Commercial Co) are ROHS3 compliant. The P4SMA36A (Eaton) is RoHS compliant. All parts are REACH unaffected and carry MSL rating of 1 (unlimited).

Q: Does package format affect substitution compatibility?

A: Yes. All listed parts use DO-214AC (SMA) surface-mount packaging, which ensures mechanical and electrical compatibility on PCBs designed for this footprint. Package differences would require PCB redesign and are not addressed in this substitution analysis.