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Taiwan Semiconductor Corporation P4KE6.8
- Part No.:
- P4KE6.8
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
P4KE6.8.pdf
- Description:
- 400W, 6.8V, UNIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:8,039
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Product details
Overview
P4KE6.8 from Taiwan Semiconductor is a unidirectional 400W transient voltage suppressor (TVS) diode with a nominal breakdown voltage of 6.8V, working stand-off voltage of 5.5V, and clamping voltage of 10.8V at 38A peak pulse current. It features low impedance, sub-1ps response time, and is used for ESD and inductive switching protection in automotive lighting and microcontroller I/O interfaces.
For engineers reviewing the P4KE6.8 datasheet, P4KE6.8 pinout, P4KE6.8 application, or P4KE6.8 equivalent, key selection criteria include its DO-41 package compatibility, 1000μA reverse leakage at 5.5V, AEC-Q101 qualification option (P4KE6.8H), and 175°C maximum junction temperature for under-hood electronics design.
Technical Context
The P4KE6.8 operates as a unidirectional avalanche diode, triggering when transient voltage exceeds its 6.12–7.48V breakdown range at 10mA test current. Its clamping action limits downstream voltage to ≤10.8V during 400W, 10/1000μs surges, enabling robust protection of 5V logic rails and automotive CAN transceivers.
Designed for surface-mount or through-hole PCB integration in DO-41 packages, it exhibits <1μA reverse leakage above 10V and a 0.057%/°C VBR temperature coefficient-critical for stable clamping across -55°C to +175°C operating range in engine control units.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 6.12V / 7.48V at 10mA - defines reliable avalanche initiation window for 5V system protection |
| VWM | 5.5V - maximum continuous reverse voltage before leakage exceeds 1000μA, safe for 5V rail operation |
| VC @ IPPM | 10.8V at 38A - peak clamped voltage during 400W transient, ensuring downstream ICs stay below 12V absolute max |
| PPK | 400W - surge power rating per 10/1000μs waveform, sufficient for ISO 7637-2 Pulse 1 & 2a immunity |
| TJ max | 175°C - enables placement near heat sources in automotive ECUs without derating concerns |
| Response time | <1.0ps - ensures suppression activates before ESD pulses damage CMOS inputs |
| Package | DO-204AL (DO-41) - industry-standard axial leaded package with 0.300g mass and UL 94V-0 molding |
Pinout & Package
DO-204AL (DO-41) package with axial leads: cathode band marked on one end; anode and cathode terminals are non-polarized in layout but functionally asymmetric for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Current sink during clamping | Connected to protected circuit ground or low-side return path to shunt surge energy |
| Cathode (banded end) | Transient voltage reference node | Connected to protected line (e.g., 5V rail); avalanche conduction begins here when VAK > VBR |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse power | Handles ISO 7637-2 Pulse 1 (inductive load dump) and IEC 61000-4-2 Level 4 ESD without degradation |
| <1.0ps response time | Activates faster than typical CMOS input rise times, preventing latch-up in microcontrollers |
| UL 94V-0 flammability rating | Ensures flame resistance of epoxy body during sustained overvoltage fault conditions |
| AEC-Q101 qualified variant available | P4KE6.8H meets automotive stress testing for temperature cycling, mechanical shock, and HTRB reliability |
| 1000μA max reverse leakage @ VWM | Minimizes standby power loss in battery-powered systems such as automotive body controllers |
Applications
| Automotive Lighting Control | Microcontroller I/O Protection |
|---|---|
Use Scenario: Protecting LED driver outputs from load-dump transients in headlamp modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed between driver output and chassis ground to clamp negative-going spikes up to -120V. Use Value: Limits voltage seen by MOSFET gate oxide to ≤10.8V, preventing gate rupture during 400W surge events. | Use Scenario: Shielding UART, SPI, or GPIO pins of automotive MCUs from ESD and board-level coupling noise. IC Role / Device Role / Timing Role: Standoff device connected between signal line and ground, conducting only during >6.12V transients. Use Value: Maintains 5.5V working voltage margin below MCU's 6V absolute max rating while delivering sub-nanosecond response. |
| Industrial Sensor Interface | Power Supply Input Stage |
Use Scenario: Safeguarding analog front-end inputs of pressure or temperature sensors exposed to field wiring surges. IC Role / Device Role / Timing Role: Low-leakage (≤1000μA) standoff protector on sensor supply rail to prevent false readings during transients. Use Value: Enables stable 5V bias delivery even during repetitive 10/1000μs surges due to thermal robustness up to 175°C. | Use Scenario: Secondary overvoltage clamp after primary DC/DC converter in 12V automotive subsystems. IC Role / Device Role / Timing Role: Fast-acting crowbar element that diverts excess energy before LDO or regulator input fails. Use Value: Clamps input to ≤10.8V during 38A surge, protecting downstream regulators rated for 12V max input. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ5.0A | Surface-mount SMB package; 5.0V VWM, 6.4V VC @ 64.5A; same 400W rating | Better suited for high-density PCBs where DO-41 axial leads are impractical | Select SMBJ5.0A when space-constrained layouts require SMD mounting and tighter clamping is needed |
| 1.5KE6.8A | Same DO-41 package; higher 1500W rating; 6.46–7.14V VBR; 10.5V VC @ 40A | Used where higher surge margin is required (e.g., alternator load dump in heavy-duty vehicles) | Choose 1.5KE6.8A when system-level testing requires >1000W surge capability beyond P4KE6.8's 400W limit |
Compared with SMBJ5.0A and 1.5KE6.8A, the P4KE6.8 offers optimal balance of cost, axial-lead manufacturability, and 400W protection for entry-level automotive and industrial control modules-without requiring PCB redesign or sacrificing thermal performance at 175°C.
Availability
P4KE6.8 is available at Aetrix Electronics and suitable for automotive lighting control, microcontroller I/O protection, and industrial sensor interface applications requiring stable component supply and long-term lifecycle support.
Supply support for P4KE6.8 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and automotive-qualified components since 1979.
The P4KE series is part of TSC's transient suppression portfolio designed specifically for automotive, industrial, and consumer electronics needing AEC-Q101-compliant, high-reliability overvoltage protection in standard DO-41 packaging.
FAQ
What is the maximum clamping voltage of the P4KE6.8 during a 400W transient event?
The P4KE6.8 clamps to a maximum of 10.8V at 38A peak pulse current under the standard 10/1000μs waveform. This value is measured per ANSI/IEEE C62.35 and ensures protected circuits remain within safe voltage margins-especially critical for 5V logic families and automotive CAN transceivers interfacing with the P4KE6.8.
Is the P4KE6.8 suitable for bidirectional transient protection?
No, the P4KE6.8 is a unidirectional TVS diode intended for DC-biased lines like 5V power rails or signal lines referenced to ground. For bidirectional protection, use the P4KE6.8CA variant, which provides symmetrical clamping in both polarities and is explicitly designated for AC-coupled or floating signal paths where polarity reversal may occur.
What is the reverse leakage current specification for the P4KE6.8 at its working stand-off voltage?
At its VWM of 5.5V, the P4KE6.8 exhibits a maximum reverse leakage current of 1000μA at 25°C. This low leakage supports energy-sensitive applications such as battery-backed automotive body modules, where standby current must be minimized without compromising surge response speed or clamping accuracy.
Does the P4KE6.8 meet automotive qualification standards?
The base P4KE6.8 is not AEC-Q101 qualified, but the P4KE6.8H variant-identical in electrical specs and DO-41 packaging-is fully AEC-Q101 certified for stress tests including temperature cycling, high-temperature reverse bias, and mechanical shock. Engineers specifying P4KE6.8 for automotive ECUs should select the 'H' suffix version to ensure compliance.
What is the thermal derating behavior of the P4KE6.8 above 25°C ambient?
The P4KE6.8's peak pulse power remains constant up to 25°C, then derates linearly per Figure 2 in the datasheet: at 75°C ambient, its steady-state power dissipation is limited to 1W with 9.5mm lead lengths mounted on 5×5mm copper pads. Its 175°C maximum junction temperature allows operation in high-heat zones like engine compartments when properly heatsinked.
P4KE6.8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-204AL, DO-41, Axial
- Series:
- P4KE
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 5.5V
- Voltage - Breakdown (Min):
- 6.12V
- Voltage - Clamping (Max) @ Ipp:
- 10.8V
- Current - Peak Pulse (10/1000µs):
- 38A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AL (DO-41)
P4KE6.8 FAQ
1.How can I place an order for P4KE6.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for P4KE6.8 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for P4KE6.8 reliable?
The price and inventory of P4KE6.8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4KE6.8 is usually 5 days.
3.What payment methods are accepted for P4KE6.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4KE6.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4KE6.8?
P4KE6.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4KE6.8 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for P4KE6.8?
For technical support, including P4KE6.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4KE6.8 requirements.
6.How does Aetrix verify that P4KE6.8 is sourced from the original manufacturer or authorized distributors?
All P4KE6.8 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that P4KE6.8 meets industry standards.
7.What is the process for return or replacement of P4KE6.8?
All P4KE6.8 units undergo pre-shipment inspection (PSI). If there is an issue with P4KE6.8, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The P4KE6.8 part is unused and in its original packaging.
Return procedure for P4KE6.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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