P4SMA9.1A Equivalent & Substitute Parts

Part Overview

The P4SMA9.1A is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This surface-mount component operates across a wide temperature range of -65°C to 150°C and is RoHS3 compliant. The part is currently in active production status with substantial inventory availability (23,750 pcs). Alternative components may be required due to supply constraints, design optimization, or application-specific requirements.

Substiute Parts

P4SMA9.1A

Littelfuse Inc.In Stock: 23830P4SMA9.1A Datasheet

Current PartRFQ

SMAJ8.0A

MeritekIn Stock: 15638SMAJ8.0A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for TVS diodes is determined by the following critical parameters:

• Package Compatibility: Both parts must use DO-214AC (SMA) surface-mount packaging to ensure PCB footprint compatibility
• Unidirectional Configuration: Single-channel zener topology required for equivalent functional performance
• Voltage Ratings: Reverse standoff voltage, breakdown voltage, and clamping voltage must fall within acceptable tolerance ranges for the protected circuit
• Current Handling: Peak pulse current rating must meet or exceed application requirements
• Power Dissipation: Peak pulse power rating must support transient energy absorption
• Temperature Range: Operating temperature specifications must encompass the application environment
• Compliance Standards: RoHS3 compliance and MSL rating must match or exceed the original component

The SMAJ8.0A from Meritek meets these substitution criteria, offering comparable electrical performance within the specified parameter envelope.

Parameter Comparison

Engineering Selection Recommendations

Both the P4SMA9.1A and SMAJ8.0A are active-status components with RoHS3 compliance and MSL Level 1 ratings, making them suitable for equivalent substitution in general-purpose TVS applications. The electrical parameters remain within acceptable tolerance ranges across voltage, current, and power specifications. The primary consideration is the operating temperature minimum: the P4SMA9.1A extends to -65°C while the SMAJ8.0A operates from -55°C. Applications requiring operation below -55°C must retain the P4SMA9.1A. For all other applications within the -55°C to 150°C range, the SMAJ8.0A provides equivalent protection performance with identical package compatibility and compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can SMAJ8.0A be used as a direct replacement for P4SMA9.1A?

A: Yes, for applications operating within -55°C to 150°C. Both components share identical DO-214AC (SMA) packaging, RoHS3 compliance, and comparable electrical performance. The primary difference is the lower temperature limit of the SMAJ8.0A.

Q: What is the voltage tolerance difference between these parts?

A: The P4SMA9.1A has a reverse standoff voltage of 7.78V, while the SMAJ8.0A is rated at 8V. Both clamping voltages (13.4V and 13.6V respectively) remain within 1.5% of each other, ensuring equivalent transient suppression performance.

Q: Are the peak pulse current ratings interchangeable?

A: The P4SMA9.1A provides 30.6A peak pulse current versus 29.41A for the SMAJ8.0A. For applications requiring the full 30.6A specification, the P4SMA9.1A is the appropriate choice. The SMAJ8.0A is suitable for applications with peak pulse requirements up to 29.41A.

Q: Do both parts have the same moisture sensitivity level?

A: Yes. Both components are rated MSL Level 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.

Q: What compliance certifications apply to both parts?

A: Both the P4SMA9.1A and SMAJ8.0A are RoHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8541.10.0080.