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Vishay General Semiconductor - Diodes Division P4KE51-E3/73
- Part No.:
- P4KE51-E3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
P4KE51-E3/73.pdf
- Description:
- TVS DIODE 41.3VWM 73.5VC DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:9,712
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Product details
Overview
P4KE51-E3/73 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode in DO-41 package, designed for clamping voltage transients on power and signal lines. It features 43.6 V stand-off voltage (VWM), 48.5–53.6 V breakdown voltage (VBR) at 1 mA, 70.1 V maximum clamping voltage (VC) at 5.7 A peak pulse current (IPPM), and 400 W peak pulse power (PPPM) with 10/1000 μs waveform - deployed in automotive sensor protection and industrial power supply input stages.
For engineers reviewing the P4KE51-E3/73 datasheet, P4KE51-E3/73 pinout, P4KE51-E3/73 application, or P4KE51-E3/73 equivalent, key selection criteria include clamping voltage margin relative to protected IC VDD, IFSM surge robustness for inductive load switching, thermal resistance (RθJL = 66 °C/W), and AEC-Q101 qualification status for automotive deployment.
Technical Context
This TVS operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its specified VBR range (48.5–53.6 V). Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance under repetitive 10/1000 μs transients.
It delivers 400 W peak pulse power handling with 0.01 % duty cycle, supports 40 A non-repetitive forward surge current (IFSM), and maintains operation across –55 °C to +175 °C junction temperature range - enabling use in high-temperature engine bay environments without derating penalties up to 125 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 43.6 V - Maximum continuous reverse voltage before significant leakage; sets upper limit for normal circuit operating voltage. |
| VBR (Breakdown Voltage) | 48.5–53.6 V at 1 mA - Confirmed avalanche initiation range; defines minimum transient threshold for clamping action. |
| VC (Clamping Voltage) | 70.1 V at IPPM = 5.7 A - Peak voltage seen by protected circuit during worst-case 10/1000 μs surge; critical for IC overvoltage margining. |
| PPPM (Peak Pulse Power) | 400 W - Sustained energy absorption capability per single 10/1000 μs transient; determines survivability against lightning or ESD-like events. |
| IFSM (Surge Current) | 40 A - Non-repetitive 8.3 ms half-sine surge rating; validates robustness against inductive kickback in relay or solenoid drive circuits. |
| TJ max. | +175 °C - Maximum junction temperature; enables placement near heat sources (e.g., power MOSFETs) without thermal shutdown risk. |
| RθJL | 66 °C/W - Junction-to-lead thermal resistance; informs heatsinking requirements when mounted on PCB copper pour or metal-core substrate. |
Pinout & Package
Package: DO-41 (DO-204AL), axial-leaded, molded epoxy body with matte tin-plated leads. Cathode indicated by color band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (banded end) | Ground reference / low-side connection | Connected to system ground or return path; reverse-biased during transient to conduct clamp current. |
| Cathode (non-banded end) | Protected line input / high-side connection | Connected to line being protected (e.g., 48 V rail); blocks normal operation but avalanches during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity stress. |
| AEC-Q101 qualified | Validated for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. |
| 400 W 10/1000 μs pulse rating | Provides immunity to ISO 7637-2 Pulse 1, 2a, 3a/b, and IEC 61000-4-5 Level 3 surges without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage exposure to downstream ICs while maintaining sufficient margin above VWM. |
| RoHS-compliant, JESD 201 Class 1A whisker tested | Meets automotive solderability and long-term interconnect reliability standards for lead-free reflow assembly. |
Applications
| Automotive Sensor Protection | Industrial 24/48 V Power Input |
|---|---|
Use Scenario: Protecting CAN/LIN transceivers and analog sensor front-ends (e.g., pressure, temperature) from load dump and jump-start transients. IC Role / Device Role: Unidirectional TVS placed between sensor supply rail and chassis ground. Use Value: Clamps 12 V/24 V system transients to ≤70.1 V, preserving integrity of 3.3 V or 5 V LDOs and ADC inputs downstream. |
Use Scenario: Safeguarding programmable logic controllers (PLCs) and motor drives against inductive switching spikes on 24 V or 48 V DC bus lines. IC Role / Device Role: Primary overvoltage clamp on main DC input prior to DC-DC converter stage. Use Value: Absorbs 400 W surges without failure, preventing latch-up or burnout of upstream rectifiers and FETs during contactor switching. |
| Telecom Line Interface | Consumer Appliance Control Board |
Use Scenario: Shielding Ethernet PHYs and PoE injectors from induced surges on outdoor cabling in security camera systems. IC Role / Device Role: Secondary protection device after gas discharge tube (GDT), placed directly at PHY connector. Use Value: Fast response (<1 ns) and low VC ensure Ethernet signal integrity remains intact during sub-microsecond transients. |
Use Scenario: Securing microcontroller I/O and relay driver circuits in washing machines and HVAC controllers exposed to mains-borne noise. IC Role / Device Role: Localized clamping on relay coil flyback path and AC zero-crossing detection inputs. Use Value: Withstands 40 A IFSM, eliminating need for external snubbers and reducing BOM count in cost-sensitive white goods designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A | DO-214AA package (SMB), 51 V VBR, same 400 W PPPM, but lower RθJA (50 °C/W vs. 100 °C/W). | Better suited for surface-mount layouts with limited board space; requires rework of footprint and thermal pad design. | Select SMBJ51A when automated SMT assembly and higher power density are prioritized over through-hole serviceability. |
| 1.5KE51A | Same DO-41 package, identical VBR and VC specs, but rated for 1500 W PPPM (10/1000 μs) and 38.2 A IPPM. | Targets higher-energy threat profiles (e.g., ISO 16750-2 long-duration load dump), not standard 400 W surge events. | Choose 1.5KE51A only if system-level testing confirms need for >400 W surge margin; otherwise P4KE51-E3/73 offers optimal cost/performance balance. |
Compared with SMBJ51A and 1.5KE51A, P4KE51-E3/73 provides AEC-Q101 qualification and optimized thermal performance in axial DO-41 form factor - making it preferred for automotive replacement parts, field-serviceable modules, and legacy through-hole designs requiring proven reliability at 400 W level.
Availability
P4KE51-E3/73 is available at Aetrix Electronics and suitable for automotive sensor protection, industrial 24/48 V power input stages, and telecom line interface applications requiring stable component supply and full traceability.
Supply support for P4KE51-E3/73 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, and protection devices with emphasis on reliability, automotive qualification, and high-volume manufacturability.
The P4KE51-E3/73 belongs to Vishay's TRANSZORB® family of TVS diodes, engineered specifically for robust transient suppression in harsh environments including automotive, industrial controls, and telecommunications infrastructure.
FAQ
What is the clamping voltage of the P4KE51-E3/73 under maximum rated surge current?
The P4KE51-E3/73 has a maximum clamping voltage (VC) of 70.1 V at 5.7 A peak pulse current (IPPM) using the standard 10/1000 μs waveform. This value is measured under defined test conditions per JEDEC standards and represents the highest voltage imposed on the protected circuit during a worst-case transient event. Designers must verify that this clamping level remains below the absolute maximum ratings of downstream components.
Is the P4KE51-E3/73 suitable for automotive applications?
Yes, the P4KE51-E3/73 is AEC-Q101 qualified and explicitly rated for automotive use. Its construction includes glass-passivated junction, matte tin-plated leads compliant with J-STD-002, and JESD 201 Class 1A whisker resistance - all validated per automotive reliability test protocols. It is commonly deployed in engine control modules, body control units, and ADAS sensor interfaces where load dump and jump-start immunity are required.
How does the P4KE51-E3/73 differ from bidirectional TVS diodes like P4KE51CA?
The P4KE51-E3/73 is unidirectional and features a cathode band for polarity identification, whereas P4KE51CA is bidirectional with no polarity marking. The unidirectional version offers lower forward voltage drop (VF = 3.5 V at 25 A) and is intended for DC line protection where polarity is fixed. Bidirectional variants are used in AC-coupled or differential signal paths such as telecom lines or RS-485 interfaces.
What is the thermal resistance from junction to ambient for the P4KE51-E3/73?
The P4KE51-E3/73 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted with 10 mm lead length, per JEDEC Test Method JESD51-2. This value assumes no additional PCB copper heatsinking. For improved thermal performance, designers should use generous copper pour on both anode and cathode pads and consider lead trimming to reduce RθJA by up to 20 %.
Can the P4KE51-E3/73 be used in parallel to increase surge current handling?
No, the P4KE51-E3/73 is not recommended for parallel operation due to inherent VBR mismatch between units, which causes uneven current sharing and potential thermal runaway. For higher surge capability, select a single higher-rated device such as 1.5KE51A or use a TVS array with matched characteristics. Parallel use voids AEC-Q101 qualification and violates Vishay's application guidance.
P4KE51-E3/73 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-204AL, DO-41, Axial
- Series:
- TransZorb®
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 41.3V
- Voltage - Breakdown (Min):
- 45.9V
- Voltage - Clamping (Max) @ Ipp:
- 73.5V
- Current - Peak Pulse (10/1000µs):
- 5.4A
- 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)
P4KE51-E3/73 FAQ
1.How can I place an order for P4KE51-E3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for P4KE51-E3/73 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 P4KE51-E3/73 reliable?
The price and inventory of P4KE51-E3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4KE51-E3/73 is usually 5 days.
3.What payment methods are accepted for P4KE51-E3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4KE51-E3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4KE51-E3/73?
P4KE51-E3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4KE51-E3/73 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 P4KE51-E3/73?
For technical support, including P4KE51-E3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4KE51-E3/73 requirements.
6.How does Aetrix verify that P4KE51-E3/73 is sourced from the original manufacturer or authorized distributors?
All P4KE51-E3/73 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 P4KE51-E3/73 meets industry standards.
7.What is the process for return or replacement of P4KE51-E3/73?
All P4KE51-E3/73 units undergo pre-shipment inspection (PSI). If there is an issue with P4KE51-E3/73, 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 P4KE51-E3/73 part is unused and in its original packaging.
Return procedure for P4KE51-E3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4KE51-E3/73 Tags
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