P4SMA11 Equivalent & Substitute Parts

Part Overview

The P4SMA11 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection in surface-mount applications. This component features a 9.4V reverse standoff voltage with a 16.38V maximum clamping voltage and 26.3A peak pulse current capability in a DO-214AC (SMA) package.

The P4SMA11 is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this component.

Substiute Parts

P4SMA11

Littelfuse Inc.In Stock: 850P4SMA11 Datasheet

Current PartRFQ

P4SMA11A

Eaton - Electronics DivisionIn Stock: 300231P4SMA11A Datasheet

DirectRFQ

P4SMA11A

Eaton - Electronics DivisionIn Stock: 300231P4SMA11A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the P4SMA11 is determined by the following critical electrical and mechanical parameters:

• Reverse Standoff Voltage (Typ): 9.4V — must match exactly
• Peak Pulse Current (10/1000µs): 26.3A — must match exactly
• Unidirectional Configuration: 1 channel — must match exactly
• Package Type: DO-214AC / SMA surface mount — must match exactly
• Zener Type: Unidirectional TVS diode — must match exactly

The P4SMA11A from Eaton - Electronics Division meets all substitution criteria. While the clamping voltage differs (15.6V versus 16.38V), the reverse standoff voltage, peak pulse current, channel configuration, and package type remain identical. The operating temperature range of the substitute (-55°C to 150°C) encompasses the primary operating window of the original part.

Parameter Comparison

Engineering Selection Recommendations

The P4SMA11A (Eaton - Electronics Division) is the qualified substitute for the obsolete P4SMA11 (Littelfuse Inc.). Selection is based on the following engineering criteria:

Electrical Compatibility: The substitute maintains identical reverse standoff voltage (9.4V), peak pulse current (26.3A), and power dissipation (400W). The clamping voltage differential (15.6V versus 16.38V) represents a 4.8% reduction, which remains within acceptable transient suppression performance for general-purpose applications.

Mechanical Compatibility: Both components utilize identical surface-mount packaging (DO-214AC / SMA), ensuring direct PCB footprint compatibility without layout modifications.

Regulatory Compliance: The P4SMA11A maintains RoHS compliance and MSL Level 1 rating, meeting environmental and moisture sensitivity requirements equivalent to the original part.

Product Availability: The P4SMA11A is classified as Active with substantial inventory availability (300,200 pcs), ensuring reliable supply chain access compared to the obsolete status of the original part.

Operating Temperature: The substitute operating range (-55°C to 150°C) covers the standard industrial temperature window, with the upper limit matching the original specification.

Frequently Asked Questions (FAQ)

Q: Can the P4SMA11A be used as a direct replacement for the P4SMA11 without circuit modifications?

A: Yes. The P4SMA11A maintains identical reverse standoff voltage, peak pulse current, power rating, and surface-mount package configuration. No circuit modifications are required for direct substitution.

Q: What is the significance of the clamping voltage difference (16.38V vs. 15.6V)?

A: The clamping voltage represents the maximum voltage across the TVS diode during transient suppression at peak pulse current. The 4.8% reduction in the P4SMA11A does not compromise general-purpose transient protection performance and remains within acceptable design margins for most applications.

Q: Are there any temperature range limitations when substituting the P4SMA11A?

A: The P4SMA11A operates from -55°C to 150°C, compared to the original -65°C to 150°C. For applications requiring operation below -55°C, the original part specification must be verified. For standard industrial and commercial temperature ranges, the substitute is fully compatible.

Q: Is the P4SMA11A available in the same packaging format?

A: Yes. Both the P4SMA11 and P4SMA11A use DO-214AC (SMA) surface-mount packaging. PCB footprints are identical, and no layout changes are necessary.

Q: What is the product status difference, and why does it matter?

A: The P4SMA11 is classified as Obsolete, indicating discontinued manufacturing and limited availability. The P4SMA11A is Active with ongoing production and substantial inventory, ensuring long-term supply chain reliability for new designs and production runs.

Q: Are both parts RoHS compliant?

A: Yes. The P4SMA11 is ROHS3 Compliant, and the P4SMA11A is RoHS Compliant. Both meet environmental regulatory requirements for electronic component manufacturing and use.