P4SMA75CA Equivalent & Substitute Parts

Part Overview

The P4SMA75CA is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface mount applications. This bidirectional zener diode operates with a reverse standoff voltage of 64.1V and provides clamping at 103V maximum, with a peak pulse current rating of 4A. The component is actively produced and widely stocked (22,600 pcs available), making it suitable for immediate deployment in protective circuit designs. Equivalent and substitute parts are identified based on matching electrical performance parameters, package compatibility, and compliance certifications to support design flexibility and supply chain continuity.

Substiute Parts

P4SMA75CA

Littelfuse Inc.In Stock: 22695P4SMA75CA Datasheet

Current PartRFQ

SMAJ64CA

MeritekIn Stock: 10039SMAJ64CA Datasheet

MFR RecommendedRFQ

SMAJ70CA

MDDIn Stock: 1201SMAJ70CA Datasheet

MFR RecommendedRFQ

SMAJ75CA

MeritekIn Stock: 20196SMAJ75CA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P4SMA75CA is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Package compatibility: DO-214AC (SMA) surface mount form factor
• Bidirectional zener TVS diode type with single channel
• Voltage - Reverse Standoff (Typ): 64V to 75V range
• Voltage - Clamping (Max) @ Ipp: 103V to 121V range
• Current - Peak Pulse (10/1000µs): 3.31A to 4A range
• Power - Peak Pulse: 400W rating
• Operating temperature range: minimum -55°C to maximum 150°C
• RoHS3 compliance and MSL 1 rating

Identified Substitute Parts:

1. SMAJ64CA (Meritek) — Matched reverse standoff voltage (64V), identical clamping voltage (103V), comparable peak pulse current (3.88A)
2. SMAJ70CA (MDD) — Higher reverse standoff voltage (70V), elevated clamping voltage (113V), reduced peak pulse current (4.6A)
3. SMAJ75CA (Meritek) — Elevated reverse standoff voltage (75V), elevated clamping voltage (121V), reduced peak pulse current (3.31A)

All substitute parts maintain the DO-214AC (SMA) package, surface mount configuration, 400W peak pulse power rating, and RoHS3 compliance required for direct substitution.

Parameter Comparison

Engineering Selection Recommendations

All identified substitute parts maintain active product status and full RoHS3 compliance with MSL 1 rating, ensuring regulatory and environmental compliance equivalent to the P4SMA75CA.

SMAJ64CA Selection: This substitute provides the closest electrical match to the P4SMA75CA, with identical reverse standoff voltage (64V) and clamping voltage (103V). Peak pulse current is marginally reduced (3.88A versus 4A). This part is suitable for applications where the original voltage specifications are critical and peak pulse current margin is available.

SMAJ70CA Selection: This substitute introduces elevated voltage specifications with 70V reverse standoff and 113V clamping voltage. Peak pulse current is reduced to 4.6A. This part is suitable for applications requiring higher voltage protection margins or where circuit design accommodates the reduced current rating.

SMAJ75CA Selection: This substitute provides the highest voltage specifications with 75V reverse standoff and 121V clamping voltage. Peak pulse current is reduced to 3.31A. This part is suitable for applications requiring maximum voltage protection or where circuit design accommodates the reduced current rating.

Operating temperature range varies across substitutes: the P4SMA75CA operates from -65°C to 150°C, while SMAJ64CA and SMAJ75CA operate from -55°C to 150°C, and SMAJ70CA operates from -50°C to 150°C. Applications requiring operation below -55°C must retain the P4SMA75CA.

Frequently Asked Questions (FAQ)

Q: Can SMAJ64CA directly replace P4SMA75CA in all applications?

A: SMAJ64CA is electrically compatible for applications where the reverse standoff voltage of 64V and clamping voltage of 103V match circuit requirements. The peak pulse current rating of 3.88A is marginally lower than the P4SMA75CA's 4A rating. Verify that circuit design accommodates this current reduction and that operating temperature does not fall below -55°C.

Q: What is the difference between the three substitute parts?

A: The three substitutes differ in voltage ratings and peak pulse current. SMAJ64CA matches the P4SMA75CA's voltage specifications most closely. SMAJ70CA and SMAJ75CA provide progressively higher voltage protection at the cost of reduced peak pulse current. Selection depends on whether the application requires the original voltage specifications or can tolerate higher voltage clamping with reduced current capacity.

Q: Are all substitute parts in the same package?

A: Yes. All substitute parts use the DO-214AC (SMA) surface mount package, ensuring mechanical and electrical compatibility with the P4SMA75CA footprint.

Q: Do the substitute parts meet the same compliance standards?

A: Yes. All substitute parts are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the P4SMA75CA's compliance profile.

Q: What is the operating temperature limitation for substitutes?

A: The P4SMA75CA operates from -65°C to 150°C. SMAJ64CA and SMAJ75CA operate from -55°C to 150°C, and SMAJ70CA operates from -50°C to 150°C. Applications requiring operation below -55°C must use the P4SMA75CA.

Q: Can I use SMAJ75CA if my circuit requires 4A peak pulse current?

A: SMAJ75CA is rated for 3.31A peak pulse current, which is lower than the 4A requirement. Use this part only if circuit design accommodates the reduced current rating or if the application does not require the full 4A specification.