P4SMA47C Equivalent & Substitute Parts

Part Overview

The P4SMA47C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 40.2V reverse standoff voltage with a 68.04V clamping voltage and 6.3A 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

P4SMA47C

Littelfuse Inc.In Stock: 778P4SMA47C Datasheet

Current PartRFQ

P4SMA47CA

Eaton - Electronics DivisionIn Stock: 300316P4SMA47CA Datasheet

DirectRFQ

P4SMA47CA

Eaton - Electronics DivisionIn Stock: 300316P4SMA47CA Datasheet

DirectRFQ

SMAJP4KE47CA-TP

Micro Commercial CoIn Stock: 1155SMAJP4KE47CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the P4SMA47C is determined by the following critical parameters: reverse standoff voltage (40.2V), peak pulse current (6.3A), peak pulse power (400W), package type (DO-214AC/SMA), and surface-mount configuration. All substitute parts must maintain these core electrical and mechanical specifications to ensure functional equivalence in circuit protection applications.

The identified substitute parts meet these criteria:

• P4SMA47CA (Eaton - Electronics Division): Maintains identical reverse standoff voltage, peak pulse current, and power rating with compatible SMA packaging and active product status.
• SMAJP4KE47CA-TP (Micro Commercial Co): Meets all critical electrical parameters with extended operating temperature range and active product status, utilizing DO-214AC (SMAJ) packaging.

Parameter Comparison

Engineering Selection Recommendations

P4SMA47CA (Eaton - Electronics Division) is the direct functional equivalent with active product status and established supply availability (300,300 pcs in stock). This part maintains identical electrical specifications and SMA packaging, making it the primary substitute for P4SMA47C applications. The part is RoHS compliant and suitable for telecom and general-purpose protection circuits.

SMAJP4KE47CA-TP (Micro Commercial Co) serves as an alternative substitute with extended operating temperature capability (-55°C to 175°C) and active product status. While utilizing DO-214AC (SMAJ) packaging instead of standard SMA, the electrical performance remains equivalent. This option provides broader thermal operating range for applications requiring extended temperature performance.

Selection between these substitutes depends on packaging availability, supply chain requirements, and thermal operating conditions specific to the application circuit.

Frequently Asked Questions (FAQ)

Q: Can P4SMA47CA directly replace P4SMA47C in existing designs?

A: Yes. P4SMA47CA maintains identical reverse standoff voltage (40.2V), peak pulse current (6.3A), and power rating (400W). Both use DO-214AC (SMA) packaging and surface-mount configuration, enabling direct PCB-level substitution without circuit modification.

Q: What is the difference between SMA and SMAJ packaging?

A: Both SMA and SMAJ are DO-214AC package variants used for surface-mount TVS diodes. The primary difference is in lead geometry and manufacturer-specific implementation. SMAJ (used in SMAJP4KE47CA-TP) represents Micro Commercial Co's variant of the DO-214AC standard. Verify PCB footprint compatibility before substitution.

Q: Why does SMAJP4KE47CA-TP have a lower clamping voltage (64.8V vs 68.04V)?

A: Clamping voltage variation within the same reverse standoff voltage class is normal across manufacturers and production lots. Both values fall within acceptable protection parameters for 40.2V standoff applications. Verify circuit requirements to confirm compatibility.

Q: Are all substitute parts RoHS compliant?

A: P4SMA47CA is RoHS compliant. SMAJP4KE47CA-TP is REACH unaffected. Both meet environmental compliance standards for current procurement requirements.

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

A: P4SMA47C operates from -65°C; both substitutes operate from -55°C. For applications requiring -65°C operation, verify that the reduced lower temperature limit of substitute parts meets circuit requirements.