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P6KE6.8A Equivalent & Substitute Parts
Part Overview
The P6KE6.8A is a transient voltage suppressor (TVS) diode designed for general-purpose overvoltage protection in through-hole applications. This unidirectional Zener diode features a 5.8V reverse standoff voltage and 10.5V maximum clamping voltage, with a peak pulse current rating of 57A (8/20µs) and 600W peak pulse power dissipation. The original onsemi P6KE6.8A is classified as obsolete. Equivalent and substitute parts from active manufacturers provide functional alternatives with identical or enhanced electrical characteristics and improved compliance certifications.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 5.8 | V |
| Voltage - Breakdown (Min) | 6.45 | V |
| Voltage - Clamping (Max) @ Ipp | 10.5 | V |
| Current - Peak Pulse (10/1000µs) | 57 | A |
| Power - Peak Pulse | 600 | W |
| Mounting Type | Through Hole | — |
| Operating Temperature Range | -55 to 150 | °C |
| Type | Zener | — |
| Unidirectional Channels | 1 | — |
| Applications | General Purpose | — |
Substitute Part Grouping Explanation
Substitution of the P6KE6.8A is determined by the following critical electrical and mechanical parameters:
Electrical Compatibility Criteria:
- Voltage - Reverse Standoff (Typ): 5.8V
- Voltage - Breakdown (Min): 6.45V
- Voltage - Clamping (Max) @ Ipp: 10.5V
- Unidirectional Channels: 1
- Type: Zener
Mechanical Compatibility Criteria:
- Mounting Type: Through Hole
- Diode Configuration: Axial lead package (T-18, DO-15, DO-201, or equivalent)
Substitute parts are grouped into two categories:
Direct Equivalents (Identical Electrical & Mechanical Specifications): Parts that maintain the same voltage ratings, clamping characteristics, and axial through-hole package format. These include P6KE6.8AE3/TR13 (Microsemi), P6KE6.8A (HY Electronic), P6KE6.8A-B (Littelfuse), P6KE6.8A-G (Comchip), and P6KE6.8A-TP (Micro Commercial Co).
Functional Equivalents (Enhanced Electrical Performance): Parts that maintain identical voltage specifications but offer higher peak pulse current ratings and power dissipation. The 1.5KE series (1.5KE6.8A, 1.5KE6.8A-B, 1.5KE6.8A-TP) provides 150A peak pulse current and 1500W power dissipation, suitable for applications requiring higher transient energy absorption while maintaining the same voltage protection threshold.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Voltage - Reverse Standoff (V) | Voltage - Clamping (Max) @ Ipp (V) | Current - Peak Pulse (A) | Power - Peak Pulse (W) | Package / Case | Operating Temperature (°C) | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| P6KE6.8A | onsemi | 5.8 | 10.5 | 57 | 600 | T-18, Axial | -55 to 150 | Obsolete | RoHS non-compliant |
| P6KE6.8AE3/TR13 | Microsemi Corporation | 5.8 | 10.5 | 57 | 600 | T-18, Axial | -65 to 150 | Active | ROHS3 Compliant |
| 1.5KE6.8A | Taiwan Semiconductor Corporation | 5.8 | 10.5 | 150 | 1500 | DO-201AA, DO-27, Axial | -55 to 175 | Active | ROHS3 Compliant |
| 1.5KE6.8A-B | Littelfuse Inc. | 5.8 | 10.5 | 144.8 | 1500 | DO-201AA, DO-27, Axial | -55 to 175 | Active | ROHS3 Compliant |
| 1.5KE6.8A-TP | Micro Commercial Co | 5.8 | 10.5 | — | 1500 | DO-201AE, Axial | -55 to 175 | Active | ROHS3 Compliant |
| P6KE6.8A | HY Electronic (Cayman) Limited | 5.8 | 10.5 | 57 | 600 | DO-204AC, DO-15, Axial | -55 to 150 | Active | ROHS3 Compliant |
| P6KE6.8A-B | Littelfuse Inc. | 5.8 | 10.5 | 58.1 | 600 | DO-204AC, DO-15, Axial | -55 to 175 | Active | ROHS3 Compliant |
| P6KE6.8A-G | Comchip Technology | 5.8 | 10.5 | 57.14 | 600 | DO-204AC, DO-15, Axial | -55 to 150 | Active | ROHS3 Compliant |
| P6KE6.8A-TP | Micro Commercial Co | 5.8 | 10.5 | 57 | 600 | DO-204AC, DO-15, Axial | -55 to 175 | Active | ROHS3 Compliant |
| P6KE6V8A | Fairchild Semiconductor | 5.8 | 13.4 | 298 | 600 | DO-204AC, DO-15, Axial | — | Active | — |
Engineering Selection Recommendations
For Direct Replacement (Identical Specifications):
Select P6KE6.8AE3/TR13 (Microsemi) as the primary direct equivalent. This part maintains identical electrical characteristics to the original onsemi P6KE6.8A while offering ROHS3 compliance and an extended lower operating temperature limit (-65°C vs. -55°C). Active product status ensures long-term availability.
Alternative direct equivalents include P6KE6.8A-B (Littelfuse), P6KE6.8A-G (Comchip), and P6KE6.8A-TP (Micro Commercial Co), all with active status and ROHS3 compliance. These maintain 57A peak pulse current and 600W power dissipation with identical voltage protection characteristics.
For Enhanced Performance Applications:
The 1.5KE series (1.5KE6.8A, 1.5KE6.8A-B, 1.5KE6.8A-TP) provides higher transient energy absorption capability with 1500W peak pulse power and peak pulse currents of 144.8A to 150A. These parts maintain the same 5.8V reverse standoff and 10.5V clamping voltages, making them suitable for applications requiring greater surge protection margin. Extended operating temperature range (-55°C to 175°C) provides additional thermal headroom.
Compliance Considerations:
All recommended active substitutes carry ROHS3 compliance certification. The original onsemi P6KE6.8A is RoHS non-compliant and obsolete. Selection of ROHS3-compliant alternatives ensures regulatory compliance for new designs and manufacturing.
Frequently Asked Questions (FAQ)
Q: Can P6KE6.8A be replaced with 1.5KE6.8A?
A: Yes. Both parts maintain identical voltage specifications (5.8V reverse standoff, 10.5V clamping). The 1.5KE6.8A provides higher peak pulse current (150A vs. 57A) and power dissipation (1500W vs. 600W). This represents an upgrade suitable for applications requiring greater transient energy absorption. Mechanical compatibility is maintained through axial through-hole packaging.
Q: What is the difference between P6KE6.8A and P6KE6.8A-B?
A: Both maintain identical electrical specifications. P6KE6.8A-B is supplied by Littelfuse in bulk packaging with a slightly higher peak pulse current specification (58.1A vs. 57A) and extended operating temperature range (-55°C to 175°C vs. -55°C to 150°C). Both are ROHS3 compliant and active products.
Q: Are package variations (DO-15, DO-201, T-18) interchangeable?
A: All substitute parts use axial through-hole packages (T-18, DO-15, DO-201, DO-204AC). These are mechanically compatible for PCB mounting. Verify PCB pad spacing and lead diameter specifications for your specific application, as minor dimensional variations exist between package designations.
Q: Why is the original P6KE6.8A obsolete?
A: The onsemi P6KE6.8A is classified as obsolete. Multiple active manufacturers now produce equivalent or superior alternatives with improved compliance certifications (ROHS3). Selection of active products ensures continued availability and supply chain stability.
Q: Can P6KE6V8A be used as a substitute?
A: P6KE6V8A maintains the same 5.8V reverse standoff voltage but features a higher clamping voltage (13.4V vs. 10.5V) and significantly higher peak pulse current (298A vs. 57A). This part is not a direct equivalent due to the elevated clamping voltage. Use only if your circuit design permits higher clamping voltage operation.
Q: What packaging options are available for P6KE6.8A substitutes?
A: Substitute parts are available in axial through-hole packages: T-18 (original specification), DO-15 (DO-204AC), and DO-201 (DO-201AA, DO-27). All are mechanically compatible for through-hole PCB assembly. Verify your PCB design accommodates the specific package variant selected.
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