P4SMA120C Equivalent & Substitute Parts

Part Overview

The P4SMA120C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose voltage protection applications. This component features a 102V reverse standoff voltage with a 173.25V maximum clamping voltage and 2.5A peak pulse current capability in a surface-mount DO-214AC (SMA) package. The part is currently listed as obsolete, making identification of equivalent and substitute components essential for ongoing design support and procurement continuity.

Substiute Parts

P4SMA120C

Littelfuse Inc.In Stock: 758P4SMA120C Datasheet

Current PartRFQ

P4SMA120CA

Eaton - Electronics DivisionIn Stock: 22534P4SMA120CA Datasheet

DirectRFQ

P4SMA120CA

Eaton - Electronics DivisionIn Stock: 22534P4SMA120CA Datasheet

DirectRFQ

SMAJP4KE120CA-TP

Micro Commercial CoIn Stock: 964SMAJP4KE120CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the P4SMA120C is determined by the following critical parameters:

• Voltage - Reverse Standoff (Typ): 102V
• Voltage - Clamping (Max) @ Ipp: Must not exceed 173.25V
• Current - Peak Pulse (10/1000µs): 2.5A minimum
• Power - Peak Pulse: 400W minimum
• Package / Case: DO-214AC or SMA equivalent
• Mounting Type: Surface Mount
• Type: Zener diode, bidirectional, single channel

The substitute parts identified below meet these electrical and mechanical requirements and are classified as direct manufacturer equivalents or manufacturer-recommended alternatives.

Parameter Comparison

Engineering Selection Recommendations

P4SMA120CA (Eaton - Electronics Division) is a direct manufacturer equivalent suitable for applications requiring active product status and continuous supply. This part maintains identical electrical specifications for reverse standoff voltage, peak pulse current, and power dissipation. The clamping voltage is 165V, which is lower than the original P4SMA120C specification of 173.25V, providing improved transient suppression performance. The part is RoHS compliant and available in active production with 22,500 units in stock. The operating temperature range is -55 to 150°C, which is narrower at the lower end compared to the original part's -65°C minimum.

SMAJP4KE120CA-TP (Micro Commercial Co) is a manufacturer-recommended alternative offering the widest operating temperature range (-55 to 175°C) and active product status. This part meets all critical electrical parameters and is supplied in DO-214AC (SMAJ) package format. With 909 units in stock, it provides an alternative source for applications requiring extended high-temperature operation. The clamping voltage specification of 165V matches the Eaton equivalent.

Both substitute parts are suitable for general-purpose and telecom applications where the P4SMA120C was originally specified. Selection between alternatives should be based on supply chain requirements, packaging preferences, and operating temperature constraints specific to the end application.

Frequently Asked Questions (FAQ)

Q: Can P4SMA120CA directly replace P4SMA120C in existing designs?

A: Yes. Both parts share identical reverse standoff voltage (102V), peak pulse current (2.5A), and power dissipation (400W) specifications. The P4SMA120CA clamping voltage of 165V is lower than the original 173.25V, which represents improved transient suppression. Verify that the narrower operating temperature range (-55 to 150°C versus -65 to 150°C) is acceptable for your application environment.

Q: What is the difference between the SMA and SMAJ package designations?

A: Both SMA and SMAJ refer to DO-214AC surface-mount packages used for TVS diodes. The designations indicate manufacturer-specific package naming conventions. Both are mechanically and electrically compatible for PCB assembly and soldering processes. Verify footprint compatibility with your PCB design files.

Q: Are all three parts RoHS compliant?

A: P4SMA120CA is RoHS compliant. P4SMA120C is ROHS3 compliant. SMAJP4KE120CA-TP is REACH unaffected. Confirm compliance requirements with your procurement and regulatory documentation before final part selection.

Q: Why is the clamping voltage lower in the substitute parts?

A: The substitute parts (P4SMA120CA and SMAJP4KE120CA-TP) specify a maximum clamping voltage of 165V compared to the original 173.25V. This represents a tighter specification that provides more effective transient voltage suppression. This is an acceptable substitution parameter as long as your circuit design accommodates the lower clamping threshold.

Q: What is the minimum operating temperature difference between parts?

A: The P4SMA120C operates from -65°C minimum, while both substitute parts operate from -55°C minimum. If your application requires operation below -55°C, the original P4SMA120C specification must be maintained. For applications within the -55 to 150°C range, both substitutes are suitable.

Q: Are there inventory considerations for part selection?

A: P4SMA120CA has 22,500 units in stock, providing the highest availability. SMAJP4KE120CA-TP has 909 units available. The original P4SMA120C, though listed as obsolete, has 732 units remaining in inventory. For new designs, prioritize active-status parts (P4SMA120CA or SMAJP4KE120CA-TP) to ensure long-term supply continuity.