P4SMA22A Equivalent & Substitute Parts

Part Overview

The P4SMA22A is an active Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This unidirectional zener diode operates across a temperature range of -65°C to 150°C and is packaged in the DO-214AC (SMA) form factor. The part is ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1). Finding equivalent or substitute parts may be necessary due to inventory constraints, lead time requirements, or application-specific performance needs while maintaining functional compatibility.

Substiute Parts

P4SMA22A

Littelfuse Inc.In Stock: 18908P4SMA22A Datasheet

Current PartRFQ

SMAJ22A-TP

Micro Commercial CoIn Stock: 4117SMAJ22A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P4SMA22A is determined by strict adherence to the following electrical and mechanical parameters:

Critical Substitution Parameters:

• Package / Case: Must be DO-214AC (SMA) for mechanical and thermal compatibility
• Mounting Type: Must be Surface Mount
• Type: Must be Zener diode, unidirectional configuration
• Voltage - Reverse Standoff: Operating range must accommodate 18.8V nominal
• Voltage - Clamping (Max) @ Ipp: Must not exceed 30.6V to prevent overvoltage conditions
• Current - Peak Pulse (10/1000µs): Must support minimum 13.4A
• Power - Peak Pulse: Must support 400W dissipation
• RoHS Status: Must maintain ROHS3 compliance
• Product Status: Must be Active

The substitute part SMAJ22A-TP meets these criteria with the same package form factor, surface-mount configuration, and equivalent electrical performance characteristics within the specified operating parameters.

Parameter Comparison

Engineering Selection Recommendations

Both the P4SMA22A and SMAJ22A-TP are active products with ROHS3 compliance and unlimited moisture sensitivity ratings, making them suitable for current production applications. The selection between these parts should be based on the specific voltage protection requirements of the application:

The P4SMA22A provides a lower reverse standoff voltage (18.8V) and lower clamping voltage (30.6V), making it appropriate for circuits requiring protection at lower voltage thresholds. The SMAJ22A-TP operates at a higher reverse standoff voltage (22V) and higher clamping voltage (35.5V), suitable for applications requiring protection at elevated voltage levels. Both parts share identical package geometry, surface-mount configuration, and power dissipation capability (400W), ensuring mechanical and thermal interchangeability within their respective voltage operating ranges.

Frequently Asked Questions (FAQ)

Q: Can SMAJ22A-TP be used as a direct replacement for P4SMA22A?

A: SMAJ22A-TP is mechanically and thermally compatible due to identical DO-214AC (SMA) packaging and surface-mount configuration. However, electrical compatibility depends on application voltage requirements. The SMAJ22A-TP has higher voltage thresholds (22V standoff vs. 18.8V, 35.5V clamping vs. 30.6V), making it suitable only for circuits designed to operate at these elevated voltage levels.

Q: Are there any compliance differences between these parts?

A: Both parts maintain ROHS3 compliance, unlimited MSL rating (1), and active product status. No compliance barriers exist for substitution within appropriate voltage application ranges.

Q: What is the impact of the different peak pulse currents?

A: The P4SMA22A supports 13.4A peak pulse current while SMAJ22A-TP supports 11.2A. Both maintain 400W peak pulse power dissipation. Application circuits must verify that peak pulse current requirements do not exceed 11.2A when using SMAJ22A-TP as a substitute.

Q: How do operating temperature ranges affect substitution?

A: P4SMA22A operates from -65°C to 150°C (junction temperature), while SMAJ22A-TP operates from -55°C to 175°C (ambient temperature). The SMAJ22A-TP provides extended high-temperature capability. Applications requiring operation below -55°C must use P4SMA22A.

Q: Are both parts suitable for general-purpose applications?

A: Yes, both parts are designated for general-purpose overvoltage protection. Selection should be based on the specific voltage protection threshold required by the circuit design.