15KP85A Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The 15KP85A is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection in through-hole applications. This part operates with an 85V reverse standoff voltage and provides 137V maximum clamping voltage at peak pulse current of 109A, delivering 15kW peak pulse power dissipation. The 15KP85A is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

15KP85A

Littelfuse Inc.In Stock: 122315KP85A Datasheet

Current PartRFQ

15KPA85A

MDE Semiconductor IncIn Stock: 183315KPA85A Datasheet

DirectRFQ

15KP85A-TP

Micro Commercial CoIn Stock: 160115KP85A-TP Datasheet

DirectRFQ

5KP85A-E3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 83255KP85A-E3/54 Datasheet

MFR RecommendedRFQ

5KP85A-E3/73

Vishay General Semiconductor - Diodes DivisionIn Stock: 9585KP85A-E3/73 Datasheet

MFR RecommendedRFQ

5KP85A-TP

Micro Commercial CoIn Stock: 7175KP85A-TP Datasheet

MFR RecommendedRFQ

5KP85AHE3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 10515KP85AHE3/54 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 15KP85A is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Voltage - Reverse Standoff: 85V (±tolerance)
• Voltage - Clamping (Max) @ Ipp: 137V (±tolerance)
• Voltage - Breakdown (Min): 94.4V (±tolerance)
• Unidirectional Channels: 1
• Type: Zener
• Mounting Type: Through Hole
• Operating Temperature Range: -55°C ~ 175°C (TJ)
• RoHS Status: ROHS3 Compliant

Secondary Considerations:

• Current - Peak Pulse (10/1000µs): Substitutes with equal or higher ratings are acceptable
• Power - Peak Pulse: Substitutes with equal or higher ratings are acceptable
• Package / Case: P600 or R-6 axial packages are compatible

Substitute parts are grouped into two categories based on power dissipation capability: full-power equivalents (15kW) and reduced-power alternatives (5kW). Both categories maintain identical voltage specifications and thermal operating range.

Parameter Comparison

Engineering Selection Recommendations

Full-Power Equivalents (15kW Peak Pulse Power):

The 15KPA85A (MDE Semiconductor Inc.) and 15KP85A-TP (Micro Commercial Co) are direct functional equivalents to the obsolete 15KP85A. Both maintain identical voltage specifications (85V standoff, 137V clamping), thermal operating range (-55°C to 175°C), and peak pulse power dissipation (15kW). Both parts are ROHS3 compliant and currently in active production status. The 15KPA85A is supplied in bulk packaging, while the 15KP85A-TP is supplied in cut tape format. Selection between these two depends on procurement and assembly requirements.

Reduced-Power Alternatives (5kW Peak Pulse Power):

The 5KP85A series parts (Vishay General Semiconductor - Diodes Division and Micro Commercial Co) provide voltage-equivalent substitution with reduced peak pulse power dissipation (5kW versus 15kW). These parts maintain the same 85V standoff voltage, 137V clamping voltage, and -55°C to 175°C operating temperature range. The 5KP85A-E3/54, 5KP85A-E3/73, and 5KP85A-TP are all ROHS3 compliant and in active production. The 5KP85AHE3/54 variant includes AEC-Q101 automotive qualification.

Reduced-power alternatives are suitable for applications where peak pulse current requirements do not exceed 36.5A. Applications requiring the full 109A peak pulse current capability must use full-power equivalents.

Frequently Asked Questions (FAQ)

Q: Can I use a 5KP85A series part as a direct replacement for the 15KP85A?

A: The 5KP85A series maintains identical voltage specifications (85V standoff, 137V clamping) and operating temperature range. However, peak pulse power dissipation is reduced from 15kW to 5kW, corresponding to a peak pulse current reduction from 109A to 36.5A. Use 5KP85A parts only if your application's transient current does not exceed 36.5A.

Q: What is the difference between P600 and R-6 package formats?

A: Both P600 and R-6 are axial through-hole packages formats for TVS diodes. P600 and R-6 are mechanically compatible in through-hole applications. Package selection depends on PCB design specifications and assembly equipment compatibility.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (15KPA85A, 15KP85A-TP, 5KP85A-E3/54, 5KP85A-E3/73, 5KP85A-TP, and 5KP85AHE3/54) are ROHS3 compliant.

Q: What is the significance of the AEC-Q101 qualification on the 5KP85AHE3/54?

A: AEC-Q101 is an automotive electronics qualification standard. The 5KP85AHE3/54 meets this qualification, making it suitable for automotive applications. Non-qualified parts may be used in non-automotive applications.

Q: Why is the 15KP85A listed as obsolete?

A: The 15KP85A is no longer manufactured by Littelfuse Inc. Active production alternatives from other manufacturers (15KPA85A and 15KP85A-TP) provide equivalent electrical and mechanical specifications for ongoing design support.

Q: Can I mix substitute parts from different manufacturers in the same design?

A: All substitute parts maintain identical voltage specifications and operating temperature ranges. Parts may be used interchangeably based on electrical requirements. Procurement, packaging format, and supply chain considerations may influence manufacturer selection.