P4SMA36 Equivalent & Substitute Parts

Part Overview

The P4SMA36 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 30.8V reverse standoff voltage with a 52.4V maximum clamping voltage and 8.2A peak pulse current capability in a DO-214AC (SMA) package. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

P4SMA36

Littelfuse Inc.In Stock: 821P4SMA36 Datasheet

Current PartRFQ

P4SMA36A

Eaton - Electronics DivisionIn Stock: 30448P4SMA36A Datasheet

MFR RecommendedRFQ

P4SMA36A

Eaton - Electronics DivisionIn Stock: 30448P4SMA36A Datasheet

MFR RecommendedRFQ

SMAJP4KE36A-TP

Micro Commercial CoIn Stock: 702SMAJP4KE36A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P4SMA36 is determined by the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): Must be 30.8V to maintain circuit protection thresholds
• Current - Peak Pulse (10/1000µs): Must be 8.2A to handle transient surge events
• Package / Case: Must be DO-214AC (SMA) for mechanical and thermal compatibility
• Mounting Type: Must be Surface Mount for PCB assembly compatibility
• Unidirectional Channels: Must be 1 channel for single-direction protection

The substitute parts P4SMA36A (Eaton - Electronics Division) and SMAJP4KE36A-TP (Micro Commercial Co) meet all critical substitution criteria. Both maintain the 30.8V reverse standoff voltage, 8.2A peak pulse current, and DO-214AC (SMA) package specification. Variations in clamping voltage (49.9V vs. 52.4V) and operating temperature ranges remain within acceptable engineering tolerances for general-purpose TVS applications.

Parameter Comparison

Engineering Selection Recommendations

P4SMA36A (Eaton - Electronics Division) is the primary recommended substitute. This part maintains full electrical equivalence with the obsolete P4SMA36, including identical reverse standoff voltage (30.8V) and peak pulse current (8.2A). The part carries Active product status with RoHS compliance certification and demonstrates high inventory availability (30,400 pcs). The clamping voltage of 49.9V represents a 2.5V reduction from the original specification but remains within acceptable protection margins for general-purpose applications. Operating temperature range of -55°C to 150°C covers standard industrial requirements.

SMAJP4KE36A-TP (Micro Commercial Co) serves as a secondary substitute option. This part provides identical electrical performance with the same 30.8V reverse standoff voltage and 8.2A peak pulse current. The extended operating temperature range (-55°C to 175°C) offers additional thermal margin for high-temperature environments. The part maintains Active product status with REACH compliance. Inventory availability is lower (654 pcs) compared to the Eaton alternative.

Both substitute parts are qualified for direct replacement based on electrical parameters, package compatibility, and active manufacturing status.

Frequently Asked Questions (FAQ)

Q: Can P4SMA36A be used as a direct replacement for P4SMA36?

A: Yes. Both parts share identical reverse standoff voltage (30.8V), peak pulse current (8.2A), and DO-214AC (SMA) package specifications. The clamping voltage difference (49.9V vs. 52.4V) does not prevent functional substitution in general-purpose protection circuits.

Q: What is the primary reason for substituting the P4SMA36?

A: The P4SMA36 is listed as obsolete by the original manufacturer (Littelfuse Inc.). P4SMA36A and SMAJP4KE36A-TP are active products with confirmed manufacturing and supply availability.

Q: Are there package compatibility concerns with these substitutes?

A: No. All three parts use the DO-214AC (SMA) surface-mount package. PCB footprints and reflow soldering profiles are identical.

Q: How do the operating temperature ranges compare?

A: The original P4SMA36 operates from -65°C to 150°C. P4SMA36A operates from -55°C to 150°C, and SMAJP4KE36A-TP extends to -55°C to 175°C. For applications requiring the full -65°C lower limit, verify circuit performance at reduced temperature with the substitute part's -55°C minimum specification.

Q: What is the significance of the clamping voltage difference?

A: The P4SMA36 clamps at 52.4V maximum, while both substitutes clamp at 49.9V. This 2.5V reduction provides slightly faster transient suppression. Verify that downstream components tolerate the lower clamping voltage in your specific circuit design.

Q: Which substitute should I select for new designs?

A: P4SMA36A (Eaton) is recommended for new designs due to higher inventory availability, established supply chain presence, and RoHS compliance certification. SMAJP4KE36A-TP is suitable when extended temperature range (-55°C to 175°C) is required.