P4SMA15 Equivalent & Substitute Parts

Part Overview

The P4SMA15 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features a 12.8V reverse standoff voltage and 22.26V maximum clamping voltage with 19.3A peak pulse current capability in a DO-214AC (SMA) package. The P4SMA15 is currently listed as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Substiute Parts

P4SMA15

Littelfuse Inc.In Stock: 1232P4SMA15 Datasheet

Current PartRFQ

P4SMA15A

Eaton - Electronics DivisionIn Stock: 10438P4SMA15A Datasheet

MFR RecommendedRFQ

P4SMA15A

Eaton - Electronics DivisionIn Stock: 10438P4SMA15A Datasheet

MFR RecommendedRFQ

SMAJP4KE15A-TP

Micro Commercial CoIn Stock: 1098SMAJP4KE15A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the P4SMA15 is determined by the following critical parameters:

• Voltage - Reverse Standoff (Typ): Must equal 12.8V
• Voltage - Clamping (Max) @ Ipp: Must be within acceptable range (original 22.26V; substitutes at 21.2V represent a 4.7% reduction, acceptable for TVS applications)
• Current - Peak Pulse (10/1000µs): Must equal 19.3A
• Power - Peak Pulse: Must equal 400W
• Type: Must be Zener
• Unidirectional Channels: Must equal 1
• Package / Case: Must be DO-214AC, SMA
• Mounting Type: Must be Surface Mount

Both identified substitute parts meet these core electrical and mechanical requirements, ensuring functional compatibility in the original application circuit.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts are active products with current manufacturing status, addressing the obsolescence of the original P4SMA15.

P4SMA15A (Eaton - Electronics Division) is the manufacturer-recommended substitute. It maintains identical reverse standoff voltage (12.8V) and peak pulse current (19.3A) specifications. The clamping voltage is 21.2V versus the original 22.26V, representing a 4.7% reduction within acceptable TVS diode tolerance ranges. This part carries RoHS compliance certification and is available in higher inventory quantities (10,400 pcs). The operating temperature minimum is -55°C compared to the original -65°C; applications requiring operation below -55°C require evaluation against specific circuit requirements.

SMAJP4KE15A-TP (Micro Commercial Co) provides an alternative with identical electrical performance to the Eaton substitute. This part extends the maximum operating temperature to 175°C, offering broader thermal capability. Inventory availability is lower (997 pcs). REACH compliance is confirmed; RoHS status is not specified in available documentation.

Selection between these substitutes depends on application-specific requirements: inventory availability, temperature operating range, and compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can P4SMA15A or SMAJP4KE15A-TP be used as direct replacements for P4SMA15?

A: Both parts meet the core electrical specifications (12.8V reverse standoff, 19.3A peak pulse current, 400W power rating) and package requirements (DO-214AC, SMA surface mount). The clamping voltage difference (21.2V vs. 22.26V) is within standard TVS diode tolerance ranges. Direct substitution is supported from an electrical and mechanical standpoint.

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

A: The original P4SMA15 specifies 22.26V maximum clamping voltage; both substitutes specify 21.2V. This 4.7% reduction means the TVS will clamp transient voltages slightly lower. For most general-purpose overvoltage protection applications, this difference is acceptable. Applications with strict voltage ceiling requirements should verify that 21.2V clamping meets circuit protection thresholds.

Q: Are there temperature range limitations with the substitutes?

A: P4SMA15A operates from -55°C to 150°C (TJ), compared to the original -65°C to 150°C. Applications requiring operation below -55°C must confirm compatibility with circuit thermal requirements. SMAJP4KE15A-TP extends the upper limit to 175°C, providing additional thermal margin for high-temperature environments.

Q: What compliance certifications apply to these substitutes?

A: P4SMA15A carries RoHS compliance certification. SMAJP4KE15A-TP confirms REACH compliance; RoHS status is not documented. Both parts carry EAR99 export classification and HTSUS code 8541.10.0080. Applications requiring specific compliance certifications should verify against procurement requirements.

Q: How do packaging and availability differ?

A: P4SMA15A is supplied in Cut Tape (CT) and Digi-Reel® packaging with 10,400 pcs in stock. SMAJP4KE15A-TP is supplied in Bulk packaging with 997 pcs available. For high-volume production, P4SMA15A offers superior availability and standard tape-and-reel packaging for automated assembly.