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Taiwan Semiconductor Corporation P4KE51C
- Part No.:
- P4KE51C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
P4KE51C.pdf
- Description:
- 400W, 51V, BIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:8,510
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Product details
Overview
P4KE51C from Taiwan Semiconductor is a unidirectional 400W transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a 51V nominal breakdown voltage (VBR min/max = 45.9V/56.1V at 1mA), 41.3V working stand-off voltage (VWM), and clamps transients to ≤73.5V at 5.7A peak pulse current under 10/1000μs waveform - ideal for safeguarding automotive power supplies and industrial sensor interfaces.
For engineers reviewing the P4KE51C datasheet, P4KE51C pinout, P4KE51C application, or P4KE51C equivalent, key selection considerations include its DO-204AL (DO-41) axial package, unidirectional polarity with cathode band marking, low leakage (<1μA @ 41.3V), and AEC-Q101 qualification option - critical for ESD and load-dump immunity in harsh-environment electronics.
Technical Context
The P4KE51C operates as a silicon avalanche diode optimized for fast transient suppression. Its clamping action begins at VBR (45.9–56.1V), maintains low dynamic impedance during surge events, and delivers 400W peak pulse power handling per 10/1000μs waveform per IEC 61000-4-5 and ANSI/IEEE C62.35 standards.
It exhibits sub-nanosecond response time (<1.0ps from 0V to VBR), junction temperature range of –55°C to +175°C, and thermal derating above 25°C ambient - enabling reliable operation in engine control units, industrial PLC I/O modules, and LED driver input stages without external heat sinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 41.3 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC rail margin. |
| VBR @ IT=1mA | 45.9–56.1 V - Breakdown onset range; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 73.5 V - Clamped voltage at 5.7A peak pulse; determines maximum stress on downstream ICs. |
| PPK | 400 W - Peak pulse power rating at 10/1000μs; supports automotive load-dump and ISO 7637-2 Pulse 5a. |
| ID @ VWM | <1 μA - Reverse leakage at stand-off voltage; minimizes standby power loss in battery-powered systems. |
| TJ max | +175 °C - Maximum junction temperature; enables placement near hot components like MOSFETs or transformers. |
| Package | DO-204AL (DO-41) - Axial-leaded through-hole package with tin-plated leads; compatible with wave soldering per J-STD-002. |
Pinout & Package
DO-204AL (DO-41) axial package with cathode band marking for unidirectional polarity. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD 201 Class 2 whisker resistance. Weight ≈ 0.300 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-impedance return path; completes clamping loop during transient. |
| Cathode | High-side connection point | Connected to protected line (e.g., 48V rail); avalanche conduction occurs when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 400W surge capability | Withstands 10/1000μs transients up to 400W - meets ISO 7637-2 Pulse 5a for 12V/24V automotive systems. |
| Fast response time | <1.0 ps rise-to-breakdown - limits voltage overshoot before protection engages, preserving sensitive analog front-ends. |
| AEC-Q101 qualified option | Available in H-suffix variant (e.g., P4KE51CH) - validated for automotive under-hood temperature cycling and humidity testing. |
| Low clamping ratio | VC/VBR ≈ 1.39 (73.5V / 52.5V typ.) - tighter than many competing TVS diodes, reducing stress on protected ICs. |
| UL recognition | UL File #E-326243 - certifies flammability (UL 94V-0) and safety compliance for end-equipment approvals. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting microcontroller power inputs in body control modules exposed to ISO 7637-2 load-dump pulses up to 120V. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 12V supply and local LDO input to clamp surges before regulation. Use Value: Limits voltage seen by LDO to ≤73.5V, preventing latch-up or permanent damage during 400W transient events. | Use Scenario: Shielding 4–20mA current-loop transmitter inputs from ESD and inductive switching noise in factory automation. IC Role / Device Role / Timing Role: Standoff protection device across input terminals, absorbing ±8kV contact ESD per IEC 61000-4-2. Use Value: Sub-1ns response ensures clamping initiates before ESD pulse couples into op-amp input stage, preserving measurement accuracy. |
| LED Driver Input Stage Protection | DC Power Supply Output Clamping |
Use Scenario: Safeguarding constant-current LED driver ICs against back-EMF from relay-coil deactivation in streetlight controllers. IC Role / Device Role / Timing Role: TVS connected anode-to-ground, cathode-to-driver VIN to shunt inductive kickback energy. Use Value: 5.7A peak pulse current rating handles typical relay coil energy without degradation, extending driver lifetime. | Use Scenario: Secondary-side overvoltage clamping on isolated DC-DC converter outputs powering FPGA core rails. IC Role / Device Role / Timing Role: Fast-acting crowbar element that diverts fault current if feedback loop fails and output rises beyond specification. Use Value: Clamps output to 73.5V within 1ps, preventing catastrophic failure of 1.2V FPGA core logic while allowing upstream OVP to respond. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A | Surface-mount SMB package; 600W rating; lower clamping voltage (VC = 85V @ 6.7A) | Better suited for high-density PCBs where space is constrained; requires rework for through-hole legacy designs. | Select SMBJ51A when upgrading to SMT layout or requiring higher surge margin; not drop-in for DO-41 footprints. |
| 1N6267A | Same DO-41 package; 400W rating; slightly higher VBR (53–59V) and VC (77V @ 5.2A) | Compatible mechanical replacement but with looser clamping tolerance; may require system-level revalidation. | Choose 1N6267A only if P4KE51C is unavailable and board-level validation confirms 77V clamping is acceptable. |
Compared with SMBJ51A and 1N6267A, the P4KE51C offers optimal balance of proven DO-41 reliability, tight 45.9–56.1V VBR window, and UL/IEC-compliant surge performance - making it preferred for cost-sensitive, high-volume automotive and industrial through-hole assemblies.
Availability
P4KE51C is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and LED driver input stage clamping requiring stable component supply across multi-year production cycles.
Supply support for P4KE51C 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 thyristors - with global distribution and AEC-Q101 qualification capabilities.
The P4KE series belongs to TSC's high-reliability transient suppression product line, engineered specifically for robust overvoltage protection in automotive, industrial, and lighting applications where long-term stability and surge endurance are critical.
FAQ
What is the polarity configuration of the P4KE51C?
The P4KE51C is a unidirectional TVS diode with cathode band marking on the DO-41 package. It conducts only during positive transients on the cathode side relative to anode (ground), making it suitable for DC rail protection where polarity is fixed. Bidirectional variants (e.g., P4KE51CA) exist but are distinct part numbers - P4KE51C must be oriented correctly in-circuit to function as specified.
Does the P4KE51C meet AEC-Q101 requirements?
The base P4KE51C is not AEC-Q101 qualified; however, the P4KE51CH variant (with "H" suffix) is explicitly qualified per AEC-Q101 Rev D for stress tests including temperature cycling, humidity bias, and mechanical shock. Engineers requiring automotive-grade assurance must specify P4KE51CH - the standard P4KE51C lacks this certification and should be used only in non-automotive applications unless fully validated.
What is the maximum clamping voltage of the P4KE51C under surge conditions?
The P4KE51C clamps to a maximum of 73.5 V at 5.7 A peak pulse current (IPPM) under the standardized 10/1000 μs double-exponential waveform. This value is guaranteed across the full operating temperature range and represents the highest voltage downstream components will experience during a 400W transient event - critical for ensuring compatibility with 75V-rated downstream ICs.
How does the P4KE51C compare to the P4KE51A in terms of electrical performance?
The P4KE51C has a VBR range of 45.9–56.1 V at 1 mA, while the P4KE51A offers tighter tolerance: 48.5–53.6 V. The P4KE51A also features lower clamping voltage (70.1 V vs. 73.5 V) and slightly higher IPPM (6.0 A vs. 5.7 A). Both share identical package, power rating, and thermal specs - choose P4KE51A when tighter VBR control and lower clamping are required; P4KE51C remains optimal for cost-driven designs accepting wider VBR spread.
Can the P4KE51C be used in bidirectional signal line protection?
No - the P4KE51C is strictly unidirectional and unsuitable for AC or bidirectional signal lines without external circuitry. For such applications, use the dedicated bidirectional variant P4KE51CA, which provides symmetrical clamping in both directions with matched VBR (45.9–56.1 V) and VC (73.5 V) characteristics. Using P4KE51C on a bidirectional line risks forward conduction during negative half-cycles and potential device failure.
P4KE51C 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 41.3V
- Voltage - Breakdown (Min):
- 45.9V
- Voltage - Clamping (Max) @ Ipp:
- 73.5V
- Current - Peak Pulse (10/1000µs):
- 5.7A
- 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)
P4KE51C FAQ
1.How can I place an order for P4KE51C through Aetrix?
Please submit a Request for Quotation (RFQ) for P4KE51C 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 P4KE51C reliable?
The price and inventory of P4KE51C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4KE51C is usually 5 days.
3.What payment methods are accepted for P4KE51C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4KE51C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4KE51C?
P4KE51C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4KE51C 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 P4KE51C?
For technical support, including P4KE51C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4KE51C requirements.
6.How does Aetrix verify that P4KE51C is sourced from the original manufacturer or authorized distributors?
All P4KE51C 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 P4KE51C meets industry standards.
7.What is the process for return or replacement of P4KE51C?
All P4KE51C units undergo pre-shipment inspection (PSI). If there is an issue with P4KE51C, 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 P4KE51C part is unused and in its original packaging.
Return procedure for P4KE51C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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