P4SMA51A Equivalent & Substitute Parts

Part Overview

The P4SMA51A is an active Littelfuse Transient Voltage Suppressor (TVS) diode designed for general-purpose overvoltage protection applications. This unidirectional zener diode operates in the 43.6V reverse standoff voltage range with a 70.1V maximum clamping voltage and 5.8A peak pulse current capability. The device is packaged in DO-214AC (SMA) surface mount format and is ROHS3 compliant with unlimited moisture sensitivity rating. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter ranges for this product category.

Substiute Parts

P4SMA51A

LittelfuseIn Stock: 66719P4SMA51A Datasheet

Current PartRFQ

SMAJ51A-TP

Micro Commercial CoIn Stock: 35506SMAJ51A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

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

• Package Compatibility: Both parts must use DO-214AC (SMA) surface mount packaging to ensure mechanical and electrical compatibility with existing PCB layouts and assembly processes.
• Voltage Rating Alignment: The reverse standoff voltage, breakdown voltage, and clamping voltage must fall within acceptable tolerance ranges for the application circuit.
• Current Handling Capacity: Peak pulse current rating must meet or exceed the application requirement.
• Power Dissipation: Peak pulse power rating must support the transient energy levels in the protected circuit.
• Compliance Status: Both parts must maintain ROHS3 compliance and equivalent moisture sensitivity ratings.
• Product Status: Active status ensures ongoing availability and manufacturing support.

The SMAJ51A-TP from Micro Commercial Co meets these substitution criteria with compatible DO-214AC packaging, ROHS3 compliance, and active product status.

Parameter Comparison

Engineering Selection Recommendations

Both the P4SMA51A and SMAJ51A-TP maintain active product status with full ROHS3 compliance and unlimited moisture sensitivity ratings, ensuring long-term availability and manufacturing consistency. The SMAJ51A-TP operates across a wider temperature range (-55 to 175°C versus -65 to 150°C), providing extended thermal performance margins in certain applications. The voltage ratings differ between the two devices, with the SMAJ51A-TP operating at higher standoff and clamping voltages. Selection between these parts must be based on the specific circuit voltage requirements and transient energy specifications of the target application.

Frequently Asked Questions (FAQ)

Q: Can SMAJ51A-TP directly replace P4SMA51A in all applications?

A: Both devices share identical DO-214AC (SMA) packaging and equivalent power dissipation ratings. However, the SMAJ51A-TP operates at higher voltage levels (51V standoff versus 43.6V). Direct substitution is valid only when the application circuit voltage specifications align with the SMAJ51A-TP ratings.

Q: What are the key differences between these two TVS diodes?

A: The primary differences are voltage ratings and peak pulse current capacity. The P4SMA51A provides 43.6V standoff with 5.8A peak pulse current, while the SMAJ51A-TP provides 51V standoff with 4.9A peak pulse current. Both maintain 400W peak pulse power and DO-214AC surface mount packaging.

Q: Are both parts suitable for general-purpose overvoltage protection?

A: Yes. Both devices are classified for general-purpose applications with ROHS3 compliance and active product status, ensuring suitability for standard transient voltage suppression circuits.

Q: What is the significance of the DO-214AC (SMA) package specification?

A: The DO-214AC (SMA) package is a standardized surface mount format that ensures mechanical compatibility with existing PCB layouts, assembly equipment, and reflow processes. Both substitute parts use this identical package specification.

Q: How do operating temperature ranges affect part selection?

A: The SMAJ51A-TP supports -55 to 175°C operation, while the P4SMA51A supports -65 to 150°C. The SMAJ51A-TP provides higher maximum temperature capability, which may be advantageous in high-temperature environments. The P4SMA51A extends to lower minimum temperatures for cryogenic applications.