P4SMA20A-Q Equivalent & Substitute Parts

Part Overview

The P4SMA20A-Q is a unidirectional transient voltage suppressor (TVS) diode manufactured by Bourns Inc., designed for telecom applications requiring transient protection. This surface mount component operates with a reverse standoff voltage of 17.1V and provides clamping at 27.7V maximum. The part is actively produced, AEC-Q101 qualified for automotive applications, and RoHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or design flexibility needs.

Substiute Parts

P4SMA20A-Q

Bourns Inc.In Stock: 973P4SMA20A-Q Datasheet

Current PartRFQ

SMAJE17AH

Eaton - Electronics DivisionIn Stock: 2147SMAJE17AH Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P4SMA20A-Q is determined by electrical parameter equivalence within defined tolerances and mechanical compatibility. The critical parameters governing substitution are:

• Voltage - Reverse Standoff (Typ): 17.1V nominal, with acceptable range 17V to 17.1V
• Voltage - Clamping (Max) @ Ipp: 27.7V nominal, with acceptable range 27.6V to 27.7V
• Current - Peak Pulse (10/1000µs): 14.8A nominal, with acceptable range 14.5A to 14.8A
• Power - Peak Pulse: 400W fixed requirement
• Package / Case: DO-214AC (SMA) surface mount only
• Operating Temperature Range: -55°C to 150°C (TJ)
• Qualification: AEC-Q101 automotive grade
• RoHS Status: ROHS3 Compliant

The SMAJE17AH from Eaton - Electronics Division meets these substitution criteria with voltage and current parameters within acceptable tolerance bands and identical package, temperature, and compliance specifications.

Parameter Comparison

Engineering Selection Recommendations

The SMAJE17AH is a direct substitute for the P4SMA20A-Q based on the following engineering criteria:

Electrical Equivalence: Both devices operate within the same voltage class (17V standoff, 27.6–27.7V clamping) and current rating (14.5–14.8A peak pulse). The parameter variations fall within acceptable engineering tolerances for transient suppression applications.

Mechanical Compatibility: Both parts use identical DO-214AC (SMA) surface mount packaging, enabling direct PCB footprint compatibility without layout modifications.

Compliance and Certification: Both parts carry AEC-Q101 automotive qualification and ROHS3 compliance, meeting the same regulatory and quality standards. Operating temperature ranges are identical (-55°C to 150°C TJ).

Application Suitability: Both devices are specified for telecom applications with identical power dissipation capability (400W peak pulse), confirming functional equivalence in the intended use case.

Selection between P4SMA20A-Q and SMAJE17AH should be based on availability, lead time, and cost considerations, as both parts satisfy identical electrical and mechanical requirements.

Frequently Asked Questions (FAQ)

Q: Can the SMAJE17AH replace the P4SMA20A-Q in existing designs without PCB modification?

A: Yes. Both parts use the DO-214AC (SMA) surface mount package with identical pinout and footprint. No PCB layout changes are required.

Q: What is the acceptable voltage tolerance range for substitution?

A: The reverse standoff voltage must remain within 17V to 17.1V, and clamping voltage must remain within 27.6V to 27.7V. Both the P4SMA20A-Q and SMAJE17AH fall within these ranges.

Q: Are there differences in peak pulse current handling between these parts?

A: The P4SMA20A-Q is rated at 14.8A peak pulse, while the SMAJE17AH is rated at 14.5A peak pulse. Both meet the 400W power dissipation requirement. The 0.3A difference is within acceptable tolerance for transient suppression applications.

Q: Do both parts meet automotive qualification requirements?

A: Yes. Both the P4SMA20A-Q and SMAJE17AH carry AEC-Q101 automotive qualification and are suitable for automotive-grade applications.

Q: Are there any RoHS or environmental compliance differences?

A: No. Both parts are ROHS3 compliant and REACH unaffected, meeting identical environmental and regulatory standards.

Q: What is the operating temperature range for both parts?

A: Both parts operate across -55°C to 150°C junction temperature (TJ), providing identical thermal performance specifications.

Q: Can these parts be used interchangeably in telecom protection circuits?

A: Yes. Both parts are specified for telecom applications with equivalent electrical performance, making them functionally interchangeable in transient voltage suppression circuits.