P4SMA27 Equivalent & Substitute Parts

Part Overview

The P4SMA27 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., rated for 23.1V reverse standoff voltage with a 39.38V maximum clamping voltage at peak pulse current. This component is designed for general-purpose transient voltage suppression in surface-mount applications using the DO-214AC (SMA) package. The part is currently listed as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and procurement.

Substiute Parts

P4SMA27

Littelfuse Inc.In Stock: 2280P4SMA27 Datasheet

Current PartRFQ

P4SMA27A

Eaton - Electronics DivisionIn Stock: 1977P4SMA27A Datasheet

DirectRFQ

P4SMA27A

Eaton - Electronics DivisionIn Stock: 1977P4SMA27A Datasheet

DirectRFQ

SMAJP4KE27A-TP

Micro Commercial CoIn Stock: 829SMAJP4KE27A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P4SMA27 is determined by the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 23.1V
• Voltage - Clamping (Max) @ Ipp: Must remain within acceptable operating range
• Current - Peak Pulse (10/1000µs): 10.9A
• Power - Peak Pulse: 400W
• Package / Case: DO-214AC, SMA (surface-mount compatibility)
• Unidirectional Channels: 1
• Type: Zener

The substitute parts P4SMA27A and SMAJP4KE27A-TP maintain the same reverse standoff voltage (23.1V), peak pulse current (10.9A), and power rating (400W). Both are housed in the DO-214AC (SMA) package and are unidirectional Zener diodes. The primary difference is the maximum clamping voltage: P4SMA27A clamps at 37.5V, while SMAJP4KE27A-TP also clamps at 37.5V. These variations remain within acceptable substitution parameters for the P4SMA27 series.

Parameter Comparison

Engineering Selection Recommendations

P4SMA27A (Eaton - Electronics Division) is an active product with RoHS compliance and is suitable for designs requiring telecom-grade reliability. This part maintains identical reverse standoff voltage and peak pulse current specifications while offering a lower maximum clamping voltage (37.5V vs. 39.38V), which may provide improved transient suppression performance in applications with tighter voltage margins.

SMAJP4KE27A-TP (Micro Commercial Co) is an active product with an extended operating temperature range (-55°C ~ 175°C) compared to the original P4SMA27. This part is designated as a manufacturer-recommended substitute and maintains the same electrical performance as P4SMA27A. Selection between these two active alternatives depends on application-specific temperature requirements and supply chain availability.

Frequently Asked Questions (FAQ)

Q: Can P4SMA27A be used as a direct replacement for P4SMA27?

A: Yes. Both parts share the same reverse standoff voltage (23.1V), peak pulse current (10.9A), power rating (400W), and DO-214AC (SMA) package. The lower clamping voltage of P4SMA27A (37.5V vs. 39.38V) represents improved transient suppression performance and is compatible with the original design intent.

Q: What is the difference between P4SMA27A and SMAJP4KE27A-TP?

A: Both parts have identical electrical specifications (23.1V standoff, 37.5V clamping, 10.9A peak pulse current, 400W power rating) and the same DO-214AC (SMA) package. SMAJP4KE27A-TP offers an extended operating temperature range (-55°C ~ 175°C vs. -55°C ~ 150°C) and is designated as a manufacturer-recommended substitute.

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

A: Yes. P4SMA27, P4SMA27A, and SMAJP4KE27A-TP are all housed in the DO-214AC (SMA) surface-mount package, ensuring mechanical and electrical compatibility on existing PCB layouts.

Q: What compliance certifications apply to these parts?

A: P4SMA27 is ROHS3 compliant. P4SMA27A is RoHS compliant. SMAJP4KE27A-TP compliance status is not specified in available documentation. All three parts carry EAR99 export classification.

Q: Why is the clamping voltage different between the original and substitute parts?

A: The P4SMA27A and SMAJP4KE27A-TP both clamp at 37.5V, which is lower than the original P4SMA27 specification of 39.38V. This difference reflects manufacturing variations within the P4SMA series and does not affect functional compatibility, as both values remain within acceptable transient suppression parameters for the 23.1V standoff voltage class.