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3KP85C Transient Voltage Suppressor - Equivalent & Substitute Parts
Part Overview
The 3KP85C is a bidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This through-hole component features an 85V reverse standoff voltage rating and 3000W peak pulse power handling capability. The product is currently obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Voltage - Reverse Standoff (Typ) | 85V |
| Voltage - Breakdown (Min) | 89.28V |
| Voltage - Clamping (Max) @ Ipp | 143.85V |
| Current - Peak Pulse (10/1000µs) | 21.9A |
| Power - Peak Pulse | 3000W |
| Mounting Type | Through Hole |
| Package / Case | P600, Axial |
| Operating Temperature Range | -55°C ~ 175°C (TJ) |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution eligibility for the 3KP85C is determined by the following critical parameters:
- Voltage - Reverse Standoff (Typ): Must be 85V to maintain circuit protection thresholds
- Bidirectional Channels: Must be 1 (single channel)
- Mounting Type: Must be Through Hole to ensure PCB compatibility
- Package / Case: Must be P600 or R-6 axial configuration for mechanical fit
- Type: Must be Zener TVS diode for functional equivalence
- RoHS Status: Must maintain ROHS3 compliance for regulatory alignment
The identified substitute parts meet these core substitution criteria while offering variations in peak pulse power handling and clamping voltage characteristics.
Parameter Comparison
| Parameter | 3KP85C (Littelfuse) | 5KP85CA (Diotec) | 15KP85CA-TP (Micro Commercial Co) |
|---|---|---|---|
| Voltage - Reverse Standoff (Typ) | 85V | 85V | 85V |
| Voltage - Breakdown (Min) | 89.28V | 94.4V | 94.4V |
| Voltage - Clamping (Max) @ Ipp | 143.85V | 137V | 137V |
| Current - Peak Pulse (10/1000µs) | 21.9A | 36A | Not Specified |
| Power - Peak Pulse | 3000W | 5000W | 15000W |
| Mounting Type | Through Hole | Through Hole | Through Hole |
| Package / Case | P600, Axial | P600, Axial | R-6, Axial |
| Operating Temperature Range | -55°C ~ 175°C | -50°C ~ 175°C | -55°C ~ 175°C |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Product Status | Obsolete | Active | Active |
Engineering Selection Recommendations
5KP85CA (Diotec Semiconductor): This substitute maintains the P600 axial package configuration, ensuring direct mechanical compatibility with existing PCB layouts. The component is currently in active production status with 4650 units in stock. It provides enhanced peak pulse power handling (5000W versus 3000W) and higher peak pulse current (36A versus 21.9A), offering improved transient protection margins. Operating temperature range is -50°C to 175°C, which covers most industrial applications, though the minimum temperature is 5°C higher than the original part.
15KP85CA-TP (Micro Commercial Co): This substitute offers the highest peak pulse power rating (15000W) among available options, providing substantial protection margin for demanding applications. The component uses an R-6 axial package rather than P600, requiring PCB layout verification for mechanical fit. Operating temperature range matches the original specification (-55°C to 175°C). Product status is active with 1094 units in stock. Peak pulse current is not specified for this part.
Both substitutes maintain the critical 85V reverse standoff voltage, single bidirectional channel configuration, through-hole mounting type, and ROHS3 compliance required for functional and regulatory equivalence.
Frequently Asked Questions (FAQ)
Q: Can the 5KP85CA directly replace the 3KP85C without PCB modifications?
A: Yes. The 5KP85CA uses the same P600 axial package configuration as the 3KP85C, enabling direct mechanical substitution on existing PCBs. Both components are through-hole mounted with identical lead spacing.
Q: What is the primary difference between the 5KP85CA and 15KP85CA-TP substitutes?
A: The 15KP85CA-TP provides significantly higher peak pulse power handling (15000W versus 5000W) but uses an R-6 axial package instead of P600. This package difference requires verification of PCB hole spacing and lead diameter compatibility before implementation.
Q: Are the clamping voltage differences between substitutes significant?
A: The 3KP85C specifies a maximum clamping voltage of 143.85V, while both substitutes specify 137V. This 6.85V difference represents lower clamping voltage in the substitutes, which provides tighter voltage regulation during transient events. This is a favorable characteristic for circuit protection.
Q: Does the operating temperature range difference affect substitute selection?
A: The 5KP85CA operates from -50°C to 175°C, which is 5°C higher at the minimum temperature than the original 3KP85C specification (-55°C to 175°C). For applications requiring operation below -50°C, the 15KP85CA-TP maintains the full -55°C to 175°C range.
Q: Are all substitutes RoHS compliant?
A: Yes. Both the 5KP85CA and 15KP85CA-TP are ROHS3 compliant, maintaining regulatory alignment with the original 3KP85C component.
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