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Home > Products > Circuit Protection > Transient Voltage Suppressors (TVS) > TVS Diodes

Vishay General Semiconductor - Diodes Division 5KP51A-E3/51

Name: 5KP51A-E3/51
Brand: Vishay General Semiconductor - Diodes Division
SKU: 5KP51A-E3/51
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 5KP51A-E3/51

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

Package:: P600, Axial

Datasheet:: 5KP51A-E3/51.pdf

Description:: TVS DIODE 51VWM 82.4VC P600

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Product details

Overview

5KP51A-E3/51 from Vishay General Semiconductor is a unidirectional TransZORB® transient voltage suppressor (TVS) diode in P600 package, designed for high-energy surge protection on DC power rails and signal lines. It features 51 V standoff voltage (V_WM), 56.7–62.7 V breakdown range (V_BR at 5 mA), 82.4 V clamping voltage (V_C) at 60.7 A peak pulse current, and 5000 W peak pulse power (10/1000 µs). It is AEC-Q101 qualified and used to protect MOSFETs, ICs, and sensor interfaces in automotive power supplies.

For engineers reviewing the 5KP51A-E3/51 datasheet, 5KP51A-E3/51 pinout, 5KP51A-E3/51 application, or 5KP51A-E3/51 equivalent, key selection criteria include clamping voltage margin relative to protected device's absolute maximum rating, unidirectional polarity compatibility with DC-biased circuits, thermal derating above 25 °C, and P600 package mounting requirements for transient energy dissipation.

Technical Context

The 5KP51A-E3/51 operates as a silicon avalanche diode that enters controlled breakdown when reverse voltage exceeds its V_BR threshold, limiting transient overvoltage to ≤82.4 V at 60.7 A. Its glass-passivated P600 junction enables fast response (<1 ns) and low incremental surge resistance, critical for suppressing inductive switching spikes and lightning-induced surges.

It is rated for 5000 W peak pulse power under JEDEC-standard 10/1000 µs waveform with 0.01 % duty cycle, and supports continuous power dissipation of 8.0 W on an infinite heatsink at T_L = 75 °C. Junction temperature range spans –55 °C to +175 °C, and it meets JESD 22-B106 solderability (275 °C, 10 s).

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	51 V - Maximum continuous reverse operating voltage before leakage exceeds 2 µA; sets upper limit for DC bias in protected circuit.
V_BR (min/max)	56.7 V / 62.7 V at 5 mA - Confirmed breakdown range defining turn-on threshold; ensures reliable conduction before downstream device damage.
V_C @ I_PPM	82.4 V at 60.7 A - Clamped voltage during 5000 W transient; must stay below protected IC's absolute max rating (e.g., 100 V rail).
P_PPM	5000 W - Peak pulse power handling per 10/1000 µs waveform; defines single-event surge robustness without failure.
T_J max	+175 °C - Maximum junction temperature; enables operation in under-hood automotive environments with minimal derating.
Polarity	Unidirectional - Cathode-marked device; suitable only for DC-biased or positive-rail protection, not AC or bidirectional lines.
Package	P600 - Axial-lead, molded epoxy case (9.5 mm length); UL 94 V-0 rated, RoHS-compliant, with matte tin-plated leads.

Pinout & Package

P600 package: axial-leaded, cylindrical epoxy body with cathode band marking; lead diameter 0.81 mm (0.032"), overall length 9.5 mm (0.375"), body diameter 5.6 mm (0.220"); compliant with JESD 22-B102 solderability and JESD 201 Class 1A whisker testing (E3 suffix).

Pin/Terminal	Circuit Role	Design Meaning
Anode	DC ground reference terminal	Connected to system ground or low-side return path; carries full surge current during clamping event.
Cathode	Protected line connection	Connected to line being protected (e.g., +51 V rail); marked by color band; reverse-biased during normal operation.

Key Features

Feature	Design Value
5000 W peak pulse power	Enables suppression of high-energy transients (e.g., ISO 7637-2 Pulse 5a) without degradation, supporting automotive-grade reliability.
AEC-Q101 qualification	Validated for automotive under-hood applications including engine control units and body electronics with extended temperature cycling.
82.4 V clamping at 60.7 A	Provides defined overvoltage ceiling for 51 V systems, ensuring protected devices remain within safe operating area during surge events.
P600 glass-passivated junction	Delivers sub-nanosecond response and stable V_BR over lifetime, critical for protecting fast-switching MOSFET gates and microcontroller I/O.
UL 94 V-0 molding compound	Prevents flame propagation in enclosed enclosures, meeting safety requirements for industrial power supply and EV charging modules.

Applications

Automotive Power Rail Protection	Industrial DC Power Supply Output
Use Scenario: Protecting 48 V battery management system (BMS) input against load dump transients per ISO 16750-2. IC Role / Device Role / Timing Role: Unidirectional TVS placed between BMS input and chassis ground to clamp voltage excursions above 51 V. Use Value: Limits peak voltage to 82.4 V during 100 V/100 ms load dump, preventing gate oxide rupture in upstream DC/DC controllers.	Use Scenario: Safeguarding output of 51 V telecom rectifier against inductive kickback from relay coils and motor drivers. IC Role / Device Role / Timing Role: Standoff-rated TVS connected across rectifier output terminals to absorb repetitive 5000 W surges. Use Value: Maintains system uptime by avoiding crowbar circuit replacement-absorbs energy while allowing fuse coordination and resettable operation.
Sensor Signal Line Protection	MOSFET Gate Driver Protection
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) in harsh industrial environments from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-leakage (2 µA at 51 V) unidirectional TVS placed at sensor PCB connector to shunt transients to ground. Use Value: Preserves signal integrity by clamping sub-100 ns ESD pulses to <83 V without affecting 0–5 V sensor range during normal operation.	Use Scenario: Preventing gate-source overvoltage in high-side N-channel MOSFETs driven by isolated gate drivers in motor inverters. IC Role / Device Role / Timing Role: TVS mounted directly across MOSFET gate and source, referenced to local ground, to clamp Miller-induced spikes. Use Value: Avoids unintended turn-on or gate oxide breakdown by limiting V_GS to ≤82.4 V during fast dV/dt switching transitions.

Automotive Power Rail Protection

Industrial DC Power Supply Output

Use Scenario: Protecting 48 V battery management system (BMS) input against load dump transients per ISO 16750-2.

IC Role / Device Role / Timing Role: Unidirectional TVS placed between BMS input and chassis ground to clamp voltage excursions above 51 V.

Use Value: Limits peak voltage to 82.4 V during 100 V/100 ms load dump, preventing gate oxide rupture in upstream DC/DC controllers.

Use Scenario: Safeguarding output of 51 V telecom rectifier against inductive kickback from relay coils and motor drivers.

IC Role / Device Role / Timing Role: Standoff-rated TVS connected across rectifier output terminals to absorb repetitive 5000 W surges.

Use Value: Maintains system uptime by avoiding crowbar circuit replacement-absorbs energy while allowing fuse coordination and resettable operation.

Sensor Signal Line Protection

MOSFET Gate Driver Protection

Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) in harsh industrial environments from ESD and cable discharge events.

IC Role / Device Role / Timing Role: Low-leakage (2 µA at 51 V) unidirectional TVS placed at sensor PCB connector to shunt transients to ground.

Use Value: Preserves signal integrity by clamping sub-100 ns ESD pulses to <83 V without affecting 0–5 V sensor range during normal operation.

Use Scenario: Preventing gate-source overvoltage in high-side N-channel MOSFETs driven by isolated gate drivers in motor inverters.

IC Role / Device Role / Timing Role: TVS mounted directly across MOSFET gate and source, referenced to local ground, to clamp Miller-induced spikes.

Use Value: Avoids unintended turn-on or gate oxide breakdown by limiting V_GS to ≤82.4 V during fast dV/dt switching transitions.

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	Lower peak power (600 W), smaller SMB package, same V_WM/V_C but higher dynamic impedance.	Suitable for board-level ESD protection on low-energy signal lines-not for load dump or high-current surges.	Select SMBJ51A only if surge energy is ≤600 W and space-constrained; 5KP51A-E3/51 remains required for >1 kA surge handling.
1.5KE51A	Same P600 package and 5000 W rating, but older 1.5 kW series design; slightly higher V_C (84.5 V) and lower I_PPM (59.5 A).	Compatible in legacy designs where footprint and thermal mass match, but lacks AEC-Q101 qualification.	Choose 1.5KE51A only for non-automotive industrial use; 5KP51A-E3/51 preferred for AEC-Q101 compliance and tighter V_C.

Compared with SMBJ51A and 1.5KE51A, the 5KP51A-E3/51 delivers superior surge robustness (5000 W), automotive qualification, and lower clamping voltage-making it the optimal choice for high-reliability 51 V DC rail protection where thermal mass and long-term stability are critical.

Availability

5KP51A-E3/51 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial DC power supply output stabilization, and sensor interface surge hardening requiring stable component supply across multi-year production cycles.

Supply support for 5KP51A-E3/51 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive-grade qualification.

The 5KP series was engineered specifically for high-energy transient suppression in automotive and industrial power systems, targeting load dump, inductive switching, and lightning surge immunity where 5000 W pulse capability and AEC-Q101 validation are mandatory.

FAQ

What is the clamping voltage of the 5KP51A-E3/51 and how is it measured?

The 5KP51A-E3/51 has a maximum clamping voltage (V_C) of 82.4 V, measured at its peak pulse current (I_PPM) of 60.7 A using a standardized 10/1000 µs double-exponential waveform. This value is guaranteed per JEDEC test conditions and reflects the actual voltage seen by downstream components during worst-case surge events. The 5KP51A-E3/51 maintains this clamping performance across its full operating temperature range.

Is the 5KP51A-E3/51 suitable for automotive applications?

Yes, the 5KP51A-E3/51 is AEC-Q101 qualified and explicitly designed for automotive environments, including engine control units, body electronics, and battery management systems. Its –55 °C to +175 °C junction temperature range, P600 thermal mass, and validated surge performance per ISO 7637-2 make it appropriate for under-hood deployment. The 5KP51A-E3/51 meets stringent automotive reliability and qualification requirements.

What does the "E3" suffix mean in 5KP51A-E3/51?

"E3" denotes RoHS-compliant, commercial-grade packaging with matte tin-plated leads that meet J-STD-002 and JESD 22-B102 solderability standards, plus JESD 201 Class 1A whisker resistance. It distinguishes the part from HE3 (AEC-Q101 qualified) variants. The 5KP51A-E3/51 uses E3 termination and is rated for general industrial and commercial use, though it shares core electrical specs with automotive-grade versions.

Can the 5KP51A-E3/51 be used in bidirectional circuits?

No, the 5KP51A-E3/51 is unidirectional only, with a cathode band marking its polarity. It conducts only when reverse-biased beyond V_BR; forward conduction follows standard diode behavior (V_F ≈ 3.5 V at 100 A). For AC or bidirectional line protection, a paired or dedicated bidirectional TVS (e.g., 5KP51CA) must be selected-5KP51A-E3/51 is unsuitable for symmetrical surge suppression.

How does thermal derating affect the 5KP51A-E3/51's surge capability?

The 5KP51A-E3/51's peak pulse power (5000 W) is specified at T_A = 25 °C and must be derated linearly above that temperature per Figure 2 in the datasheet-e.g., at 100 °C ambient, usable pulse power drops to ~75 % of rated value. Continuous power dissipation is limited to 8.0 W on an infinite heatsink at T_L = 75 °C. Proper PCB copper pour and airflow are essential to maintain 5KP51A-E3/51 performance during repetitive surges.

5KP51A-E3/51 Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

Package/Case:: P600, Axial

Series:: TransZorb®

Packaging:: Bulk

Product Status:: Obsolete

Type:: Zener

Unidirectional Channels:: 1

Bidirectional Channels:: -

Voltage - Reverse Standoff (Typ):: 51V

Voltage - Breakdown (Min):: 56.7V

Voltage - Clamping (Max) @ Ipp:: 82.4V

Current - Peak Pulse (10/1000µs):: 60.7A

Power - Peak Pulse:: 5000W (5kW)

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:: P600

5KP51A-E3/51 FAQ

1.How can I place an order for 5KP51A-E3/51 through Aetrix?

Please submit a Request for Quotation (RFQ) for 5KP51A-E3/51 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 5KP51A-E3/51 reliable?

The price and inventory of 5KP51A-E3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 5KP51A-E3/51 is usually 5 days.

3.What payment methods are accepted for 5KP51A-E3/51?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 5KP51A-E3/51 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 5KP51A-E3/51?

5KP51A-E3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 5KP51A-E3/51 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 5KP51A-E3/51?

For technical support, including 5KP51A-E3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 5KP51A-E3/51 requirements.

6.How does Aetrix verify that 5KP51A-E3/51 is sourced from the original manufacturer or authorized distributors?

All 5KP51A-E3/51 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 5KP51A-E3/51 meets industry standards.

7.What is the process for return or replacement of 5KP51A-E3/51?

All 5KP51A-E3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 5KP51A-E3/51, 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 5KP51A-E3/51 part is unused and in its original packaging.

Return procedure for 5KP51A-E3/51:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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