P4SMA18A-M3/61 Equivalent & Substitute Parts

Part Overview

The P4SMA18A-M3/61 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the DO-214AC (SMA) package and is designed for general purpose transient voltage suppression applications. The part is currently active in production with 807 units in stock. Equivalent and substitute parts are identified based on matching electrical characteristics, mechanical compatibility, and packaging specifications to ensure direct functional replacement in circuit designs.

Substiute Parts

P4SMA18A-M3/61

Vishay General Semiconductor - Diodes DivisionIn Stock: 867P4SMA18A-M3/61 Datasheet

Current PartRFQ

P4SMA18A-E3/61

Vishay General Semiconductor - Diodes DivisionIn Stock: 20802P4SMA18A-E3/61 Datasheet

DirectRFQ

P4SMA18A

Fairchild SemiconductorIn Stock: 165157P4SMA18A Datasheet

MFR RecommendedRFQ

SMAJP4KE18A-TP

Micro Commercial CoIn Stock: 5523SMAJP4KE18A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the P4SMA18A-M3/61 are qualified based on the following critical parameters:

• Voltage - Reverse Standoff (Typ): 15.3V
• Voltage - Breakdown (Min): 17.1V
• Voltage - Clamping (Max) @ Ipp: 25.2V or 25.5V (within acceptable tolerance)
• Current - Peak Pulse (10/1000µs): 15.9A or 16.1A (within acceptable tolerance)
• Power - Peak Pulse: 400W
• Package / Case: DO-214AC or compatible SMA variant
• Mounting Type: Surface Mount
• RoHS Status: ROHS3 Compliant

All identified substitutes maintain the same unidirectional channel configuration, zener diode type, and general purpose application profile. Packaging variants (Tape & Reel vs. Bulk) do not affect electrical compatibility.

Parameter Comparison

Engineering Selection Recommendations

P4SMA18A-E3/61 (Vishay) is the primary direct substitute, offering identical electrical specifications and packaging format with higher inventory availability (20,700 units). Both parts are active products with ROHS3 compliance and equivalent performance characteristics.

SMAJP4KE18A-TP (Micro Commercial Co) is a functional equivalent with marginally higher clamping voltage (25.5V vs. 25.2V) and peak pulse current (16.1A vs. 15.9A), representing enhanced performance margins. This part features an extended operating temperature range (-55°C ~ 175°C) and is actively produced.

P4SMA18A (Fairchild Semiconductor) maintains identical electrical specifications but carries obsolete product status. Selection of this part should be limited to applications where existing inventory must be utilized, as long-term availability cannot be assured.

Frequently Asked Questions (FAQ)

Q: Can P4SMA18A-E3/61 be used as a direct replacement for P4SMA18A-M3/61?

A: Yes. Both parts share identical voltage ratings (15.3V standoff, 25.2V clamping), current ratings (15.9A peak pulse), power dissipation (400W), operating temperature range (-65°C ~ 150°C), and DO-214AC SMA package specifications. The difference in packaging format (Tape & Reel vs. Tape & Reel) does not affect electrical compatibility.

Q: What are the differences between SMAJP4KE18A-TP and the main part?

A: SMAJP4KE18A-TP maintains the same reverse standoff voltage (15.3V) and breakdown voltage (17.1V). The clamping voltage is slightly higher at 25.5V compared to 25.2V, and peak pulse current is 16.1A versus 15.9A. The operating temperature range extends to -55°C ~ 175°C. These differences represent enhanced performance margins within the same functional class. The package variant is DO-214AC SMAJ instead of SMA, but both are surface mount compatible.

Q: Why is P4SMA18A listed as obsolete?

A: P4SMA18A from Fairchild Semiconductor has been discontinued and is no longer in active production. While electrical specifications remain compatible, this part should not be selected for new designs due to uncertain long-term availability.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All identified substitute parts carry ROHS3 Compliant certification, matching the compliance status of the main part P4SMA18A-M3/61.

Q: Can substitute parts be mixed in the same production batch?

A: All substitute parts are electrically and mechanically compatible for the same circuit application. However, component sourcing practices should follow established procurement procedures to maintain traceability and consistency in manufacturing records.