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3KP11C Equivalent & Substitute Parts
Part Overview
The 3KP11C is a bidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection applications. It features an 11V reverse standoff voltage with a 19.11V maximum clamping voltage and 164.8A peak pulse current capability in a P600 axial through-hole package. The 3KP11C is classified as obsolete, making identification of active equivalent parts essential for new designs and ongoing production requirements. The 5KP11CA serves as a direct functional equivalent with enhanced performance characteristics while maintaining identical voltage standoff specifications and package compatibility.
Substiute Parts
Key Parameters
| Parameter | 3KP11C |
|---|---|
| Voltage - Reverse Standoff (Typ) | 11V |
| Voltage - Breakdown (Min) | 11.57V |
| Voltage - Clamping (Max) @ Ipp | 19.11V |
| Current - Peak Pulse (10/1000µs) | 164.8A |
| Power - Peak Pulse | 3000W (3kW) |
| Operating Temperature Range | -55°C ~ 175°C (TJ) |
| Package / Case | P600, Axial |
| Mounting Type | Through Hole |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
The 5KP11CA qualifies as a direct substitute for the 3KP11C based on the following critical parameters:
- Voltage - Reverse Standoff (Typ): Both parts maintain 11V standoff voltage, ensuring identical circuit protection thresholds
- Package / Case: Both use P600 axial through-hole packaging, providing mechanical and electrical compatibility in existing PCB layouts
- Bidirectional Configuration: Both are single-channel bidirectional TVS diodes for general-purpose applications
- Operating Temperature Range: Both support -55°C ~ 175°C operating range
- RoHS Compliance: Both meet ROHS3 compliance requirements
- Moisture Sensitivity: Both rated MSL 1 (Unlimited)
The 5KP11CA represents an enhanced alternative with superior performance metrics: higher peak pulse current (280.2A vs. 164.8A), increased power dissipation capability (5000W vs. 3000W), and lower clamping voltage (18.2V vs. 19.11V). These improvements provide superior transient suppression while maintaining backward compatibility with the obsolete 3KP11C specification.
Parameter Comparison
| Parameter | 3KP11C | 5KP11CA |
|---|---|---|
| Manufacturer | Littelfuse Inc. | Littelfuse Inc. |
| Category | Transient Voltage Suppressors (TVS) | Transient Voltage Suppressors (TVS) |
| Product Status | Obsolete | Active |
| Type | Zener | Zener |
| Bidirectional Channels | 1 | 1 |
| Voltage - Reverse Standoff (Typ) | 11V | 11V |
| Voltage - Breakdown (Min) | 11.57V | 12.2V |
| Voltage - Clamping (Max) @ Ipp | 19.11V | 18.2V |
| Current - Peak Pulse (10/1000µs) | 164.8A | 280.2A |
| Power - Peak Pulse | 3000W (3kW) | 5000W (5kW) |
| Operating Temperature | -55°C ~ 175°C (TJ) | -55°C ~ 175°C (TJ) |
| Mounting Type | Through Hole | Through Hole |
| Package / Case | P600, Axial | P600, Axial |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
The 5KP11CA is the appropriate selection for applications currently using or specifying the obsolete 3KP11C. Both components maintain identical reverse standoff voltage (11V) and package configuration (P600 axial through-hole), ensuring direct compatibility with existing circuit designs and PCB layouts.
The 5KP11CA holds active product status with full manufacturing support and availability, whereas the 3KP11C is obsolete. Both components meet ROHS3 compliance and carry MSL 1 rating, satisfying environmental and reliability requirements.
The 5KP11CA provides enhanced performance characteristics with 280.2A peak pulse current and 5000W power dissipation capability compared to the 3KP11C specifications of 164.8A and 3000W. The lower clamping voltage (18.2V vs. 19.11V) in the 5KP11CA offers improved transient suppression performance.
Frequently Asked Questions (FAQ)
Q: Can the 5KP11CA directly replace the 3KP11C in existing designs?
A: Yes. Both components share identical reverse standoff voltage (11V) and P600 axial through-hole package configuration. Direct PCB substitution is mechanically and electrically compatible.
Q: What are the key differences between these parts?
A: The 5KP11CA provides higher peak pulse current (280.2A vs. 164.8A), increased power dissipation (5000W vs. 3000W), and lower clamping voltage (18.2V vs. 19.11V). The 3KP11C is obsolete; the 5KP11CA is active production.
Q: Are there any compliance or certification differences?
A: Both components meet ROHS3 compliance and carry MSL 1 (Unlimited) moisture sensitivity rating. No compliance differences exist between the parts.
Q: Does the lower clamping voltage of the 5KP11CA affect circuit operation?
A: The 18.2V clamping voltage of the 5KP11CA is lower than the 3KP11C specification (19.11V), providing improved transient suppression performance. This represents an enhancement for protection applications.
Q: What is the packaging difference between these parts?
A: Both components use identical P600 axial through-hole packaging. No package variation exists between the 3KP11C and 5KP11CA.
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