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Taiwan Semiconductor Corporation P4KE51A
- Part No.:
- P4KE51A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
P4KE51A.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:7,966
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Product details
Overview
P4KE51A 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, 43.6V working stand-off voltage, 70.1V maximum clamping voltage at 6.0A peak pulse current, and operates across –55°C to +175°C junction temperature range - deployed in automotive power supply inputs and industrial sensor interfaces.
For engineers reviewing the P4KE51A datasheet, P4KE51A pinout, P4KE51A application, or P4KE51A equivalent, key selection criteria include clamping performance under 10/1000μs surge, low leakage (<1μA at 43.6V), AEC-Q101 qualification status, DO-41 package compatibility, and thermal derating behavior above 25°C ambient.
Technical Context
The P4KE51A functions as a unidirectional avalanche diode with fast response (<1.0ps from 0V to VBR) and low dynamic impedance during transient events. Its 400W peak pulse power rating is defined per ANSI/IEEE C62.35 at 10/1000μs waveform, and it maintains stable breakdown characteristics with a 0.102%/°C temperature coefficient.
Designed for placement across protected nodes and ground, the device conducts only when reverse voltage exceeds 48.5–53.6V (VBR @ 1mA), limiting downstream voltage to ≤70.1V while sustaining 6.0A peak pulse current - enabling robust ESD and load-dump immunity without forward conduction in normal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT | 48.5–53.6 V at 1 mA test current - defines precise avalanche initiation threshold for reliable overvoltage triggering |
| VWM | 43.6 V - maximum continuous reverse operating voltage before leakage rises significantly |
| VC @ IPPM | 70.1 V at 6.0 A - clamped voltage during full 400W surge, determining protected circuit's worst-case stress level |
| IPPM | 6.0 A - peak pulse current corresponding to 400W rating under 10/1000μs waveform |
| ID @ VWM | <1 μA - ultra-low reverse leakage ensures minimal power loss and signal integrity in standby |
| TJ Range | –55°C to +175°C - supports under-hood automotive and high-temp industrial environments without derating |
| Package | DO-204AL (DO-41) - industry-standard axial leaded package with tin-plated leads, UL 94V-0 molding |
Pinout & Package
DO-204AL (DO-41) package: axial-leaded, cylindrical glass-passivated body with cathode band marking. Leads are pure tin-plated, solderable per J-STD-002; meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference node | Connected to system ground; completes conduction path during reverse transient |
| Cathode | Protected line input | Connected to line being protected (e.g., 24V rail); avalanche occurs when cathode-to-anode voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse power | Withstands 10/1000μs surges up to 400W without degradation - suitable for ISO 7637-2 Pulse 5a load dump simulation |
| <1.0 ps response time | Enables sub-nanosecond clamping onset - critical for protecting high-speed logic and microcontroller I/O against ESD |
| AEC-Q101 qualified option | Available in H-suffix variant (e.g., P4KE51AH) for automotive-grade reliability validation including temperature cycling and HTRB |
| Low 0.102%/°C VBR drift | Ensures consistent clamping threshold across wide temperature ranges - reduces design margin uncertainty in thermal-varying environments |
| UL Recognized #E-326243 | Validates safety compliance for end-equipment certification in North America and globally harmonized markets |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: 12V/24V battery-fed ECUs exposed to load dump transients up to ±100V. IC Role / Device Role / Timing Role: Primary shunt clamp placed between power rail and chassis ground to divert surge energy before reaching LDOs or MCU power pins. Use Value: Limits rail voltage to ≤70.1V during 400W surge, preventing latch-up or permanent damage to downstream 5V/3.3V regulators. | Use Scenario: 4–20mA current loop transmitters interfacing with PLC analog inputs in factory automation. IC Role / Device Role / Timing Role: Bidirectional protection (using CA variant) or unidirectional rail clamp on signal return path to suppress EFT bursts and inductive kickback. Use Value: Maintains signal integrity with <1μA leakage at 43.6V, avoiding offset errors in precision current measurement circuits. |
| LED Driver Overvoltage Clamp | Consumer Power Adapter Surge Suppression |
Use Scenario: Constant-current LED drivers powered from rectified AC mains with potential for lightning-induced spikes. IC Role / Device Role / Timing Role: Parallel-connected TVS across output capacitor to clamp transient overvoltage before damaging LED string or driver IC. Use Value: Clamps to 70.1V within <1.0ps, protecting 48V-rated LEDs and enabling use of lower-voltage, cost-optimized driver FETs. | Use Scenario: Secondary-side DC output of universal-input AC/DC adapters subjected to conducted surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Final-stage overvoltage limiter on +5V/+12V outputs to safeguard connected USB peripherals or embedded controllers. Use Value: Provides certified 400W surge handling with UL recognition, supporting regulatory compliance without external crowbar circuitry. |
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 (vs. axial DO-41); same 51V VBR, 70V VC, but 600W rating | Requires PCB re-layout; better suited for automated SMT assembly and higher-density designs | Select SMBJ51A when board space is constrained and SMT process is established |
| 1.5KE51A | Same DO-41 package but 1500W rating; higher VC = 82.0V at 18.3A; larger body size | Overqualified for 400W needs; introduces higher clamping voltage and thermal mass | Choose 1.5KE51A only if legacy 1500W surge test requirements mandate higher power margin |
Compared with SMBJ51A and 1.5KE51A, the P4KE51A delivers optimal balance of proven axial-leaded reliability, precise 70.1V clamping, and AEC-Q101 availability - making it ideal for cost-sensitive, through-hole assembled automotive and industrial control modules where 400W surge immunity suffices.
Availability
P4KE51A is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, LED driver protection, and consumer power adapter secondary-side surge suppression requiring stable component supply and long-term lifecycle support.
Supply support for P4KE51A 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 MOSFETs - headquartered in Hsinchu, Taiwan, with global distribution and AEC-Q101 qualification capabilities.
The P4KE Series belongs to TSC's transient voltage suppressor product line, engineered specifically for robust, cost-effective overvoltage protection in automotive, industrial, and consumer power systems where reliability under repetitive surge stress is mandatory.
FAQ
What is the breakdown voltage range of the P4KE51A?
The P4KE51A has a guaranteed breakdown voltage (VBR) range of 48.5 V to 53.6 V at 1 mA test current, measured per ANSI/IEEE C62.35. This tight tolerance ensures predictable clamping onset across production lots and temperature extremes, directly supporting design margin calculations for protected 48V systems. The P4KE51A's specified VBR window reflects its role as a precision unidirectional TVS in safety-critical DC rail protection.
Is the P4KE51A suitable for automotive applications?
Yes - the P4KE51A is available in an AEC-Q101 qualified version (P4KE51AH) with validated performance across temperature cycling, highly accelerated life testing, and humidity testing per automotive reliability standards. While the base P4KE51A is not AEC-Q101 certified, its construction, DO-41 package robustness, and 175°C max junction temperature make it widely used in non-safety-critical automotive subsystems. Always specify the 'H' suffix for qualified automotive deployment. The P4KE51A datasheet confirms compatibility with load dump and ESD immunity requirements typical in body control modules.
What is the maximum clamping voltage of the P4KE51A under surge conditions?
The P4KE51A exhibits a maximum clamping voltage (VC) of 70.1 V at 6.0 A peak pulse current (IPPM), tested using the standard 10/1000μs double-exponential waveform. This value represents the highest voltage seen across the device during a full 400W transient event - a critical parameter for ensuring downstream components (e.g., 75V-rated capacitors or 60V MOSFETs) remain within safe operating limits. The P4KE51A's low VC relative to its VBR indicates high surge efficiency and minimal let-through energy.
How does the P4KE51A compare to bidirectional TVS diodes?
The P4KE51A is unidirectional and intended for DC line-to-ground protection where polarity is fixed - it conducts only during reverse overvoltage. Bidirectional variants (e.g., P4KE51CA) provide symmetrical clamping for AC or floating signal lines but exhibit higher leakage and slightly degraded VC due to dual-junction structure. For 48V DC power rails, the P4KE51A offers lower leakage (<1 μA), tighter VBR tolerance, and superior thermal response. Use P4KE51A when protecting polarized supplies; choose CA versions only for AC-coupled or differential bus protection.
What packaging options are available for the P4KE51A?
The P4KE51A is supplied in DO-204AL (DO-41) package with two standard packing formats: 5,000 pieces per tape-and-reel (P4KE51AH) and 3,000 pieces per ammo box (P4KE51A0G). Both use pure tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance. The axial lead configuration supports manual or wave soldering, and the UL 94V-0 molded body ensures flame retardancy. No SMD variant exists for the P4KE51A - surface-mount equivalents require switching to SMBJ or SMCJ series.
P4KE51A 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):
- 43.6V
- Voltage - Breakdown (Min):
- 48.5V
- Voltage - Clamping (Max) @ Ipp:
- 70.1V
- Current - Peak Pulse (10/1000µs):
- 6A
- 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)
P4KE51A FAQ
1.How can I place an order for P4KE51A through Aetrix?
Please submit a Request for Quotation (RFQ) for P4KE51A 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 P4KE51A reliable?
The price and inventory of P4KE51A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4KE51A is usually 5 days.
3.What payment methods are accepted for P4KE51A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4KE51A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4KE51A?
P4KE51A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4KE51A 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 P4KE51A?
For technical support, including P4KE51A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4KE51A requirements.
6.How does Aetrix verify that P4KE51A is sourced from the original manufacturer or authorized distributors?
All P4KE51A 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 P4KE51A meets industry standards.
7.What is the process for return or replacement of P4KE51A?
All P4KE51A units undergo pre-shipment inspection (PSI). If there is an issue with P4KE51A, 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 P4KE51A part is unused and in its original packaging.
Return procedure for P4KE51A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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