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

Vishay General Semiconductor - Diodes Division 5KP45A-E3/51

Name: 5KP45A-E3/51
Brand: Vishay General Semiconductor - Diodes Division
SKU: 5KP45A-E3/51
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 5KP45A-E3/51

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

Package:: P600, Axial

Datasheet:: 5KP45A-E3/51.pdf

Description:: TVS DIODE 45VWM 72.7VC P600

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Product details

Overview

5KP45A-E3/51 from Vishay General Semiconductor is a unidirectional TransZORB® transient voltage suppressor (TVS) diode in P600 package, designed for high-energy surge protection with 5000 W peak pulse power (10/1000 μs), 45 V stand-off voltage (V_WM), and 72.7 V clamping voltage (V_C) at 68.8 A peak pulse current. It protects MOSFETs, ICs, and sensor signal lines in automotive and industrial power supplies.

For engineers reviewing the 5KP45A-E3/51 datasheet, 5KP45A-E3/51 pinout, 5KP45A-E3/51 application, or 5KP45A-E3/51 equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 175 °C max junction temperature, low incremental surge resistance, and compatibility with 8.3 ms half-sine surge waveforms per JEDEC standards.

Technical Context

This TVS diode operates as a voltage-clamping overvoltage protector in parallel with sensitive circuitry. Its glass-passivated P600 junction enables fast response (<1 ns), low clamping ratio (V_C/V_BR ≈ 1.39), and stable breakdown at 50–55.3 V (I_T = 5.0 mA). It sustains repetitive 0.01% duty-cycle surges without degradation.

Designed for crowbar-circuit replacement in switching power supply outputs, it withstands 600 A non-repetitive forward surge (8.3 ms half-sine) while limiting clamped voltage to ≤72.7 V - ensuring downstream components remain below safe operating limits during transients induced by inductive load switching or lightning.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	45 V - maximum continuous reverse operating voltage before conduction begins; defines safe DC/AC working range.
V_BR min/max	50.0 V / 55.3 V at 5.0 mA - precise breakdown threshold ensures predictable clamping onset.
V_C @ I_PPM	72.7 V at 68.8 A - clamped voltage under 5000 W 10/1000 μs surge; determines protected circuit's worst-case overvoltage.
P_PPM	5000 W - peak pulse power handling capacity; validates suitability for high-energy industrial surges.
I_FSM	600 A - 8.3 ms half-sine forward surge rating; supports robustness against inrush and fault currents.
T_J max	175 °C - maximum junction temperature; enables operation in under-hood automotive or high-ambient industrial environments.
Polarity	Unidirectional - cathode-banded configuration; requires correct orientation for reverse-biased protection of DC rails.

Pinout & Package

5KP45A-E3/51 uses the axial-lead P600 package: molded epoxy body (UL 94 V-0), matte tin-plated leads, 9.5 mm body length, 0.375" (9.5 mm) lead spacing. Cathode identified by color band.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Low-side connection point	Connected to ground or low-potential rail; completes clamping path during overvoltage events.
Cathode	High-side connection point	Connected to protected line (e.g., +45 V rail); color band marks this terminal for correct PCB orientation.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive-grade reliability including temperature cycling, humidity, and mechanical shock per JESD22.
5000 W peak pulse power (10/1000 μs)	Enables single-device protection against IEC 61000-4-5 Level 4 (4 kV) surges without cascaded staging.
Low incremental surge resistance	Minimizes V_C overshoot during fast-rising transients, improving clamping precision and system margin.
Fast response time (<1 ns)	Activates before sensitive logic or power devices experience damaging overvoltage stress.
RoHS-compliant, JESD201 Class 1A whisker tested	Ensures long-term solder joint integrity in automated assembly and high-reliability applications.

Applications

Automotive Power Supply Protection	Industrial Motor Drive Control
Use Scenario: Protecting 48 V battery-fed ECUs and ADAS modules from load-dump transients up to 120 V. IC Role / Device Role / Timing Role: Unidirectional TVS placed across input rail to clamp surges before they reach DC/DC converters and microcontrollers. Use Value: Withstands 600 A 8.3 ms surge and clamps to ≤72.7 V, preventing latch-up or gate oxide damage in downstream SiC MOSFET drivers.	Use Scenario: Safeguarding PLC analog I/O modules connected to 24 V field sensors exposed to relay coil kickback. IC Role / Device Role / Timing Role: Parallel-connected TVS on 24 V supply line to absorb inductive energy from solenoid/valve switching. Use Value: 5000 W pulse rating handles repeated 10/1000 μs transients without degradation; 45 V V_WM ensures no leakage during normal operation.
Telecom DC Power Feeds	Renewable Energy Inverter DC Link
Use Scenario: Securing -48 V telecom rectifier outputs against lightning-induced surges on outdoor cabinet feeds. IC Role / Device Role / Timing Role: Unidirectional TVS installed at rectifier output to limit surge voltage seen by backplane regulators and FPGA power rails. Use Value: 175 °C T_J max and AEC-Q101 qualification support extended life in uncooled outdoor enclosures.	Use Scenario: Clamping overvoltages on 600 V DC link capacitors during grid-fault shutdown in solar inverters. IC Role / Device Role / Timing Role: Stringed TVS array (with voltage balancing) used as secondary overvoltage limiter alongside primary crowbar. Use Value: Low clamping ratio (1.39× V_BR) and stable V_BR tolerance (±5 %) ensure predictable energy diversion during rapid bus collapse.

Automotive Power Supply Protection

Industrial Motor Drive Control

Use Scenario: Protecting 48 V battery-fed ECUs and ADAS modules from load-dump transients up to 120 V.

IC Role / Device Role / Timing Role: Unidirectional TVS placed across input rail to clamp surges before they reach DC/DC converters and microcontrollers.

Use Value: Withstands 600 A 8.3 ms surge and clamps to ≤72.7 V, preventing latch-up or gate oxide damage in downstream SiC MOSFET drivers.

Use Scenario: Safeguarding PLC analog I/O modules connected to 24 V field sensors exposed to relay coil kickback.

IC Role / Device Role / Timing Role: Parallel-connected TVS on 24 V supply line to absorb inductive energy from solenoid/valve switching.

Use Value: 5000 W pulse rating handles repeated 10/1000 μs transients without degradation; 45 V V_WM ensures no leakage during normal operation.

Telecom DC Power Feeds

Renewable Energy Inverter DC Link

Use Scenario: Securing -48 V telecom rectifier outputs against lightning-induced surges on outdoor cabinet feeds.

IC Role / Device Role / Timing Role: Unidirectional TVS installed at rectifier output to limit surge voltage seen by backplane regulators and FPGA power rails.

Use Value: 175 °C T_J max and AEC-Q101 qualification support extended life in uncooled outdoor enclosures.

Use Scenario: Clamping overvoltages on 600 V DC link capacitors during grid-fault shutdown in solar inverters.

IC Role / Device Role / Timing Role: Stringed TVS array (with voltage balancing) used as secondary overvoltage limiter alongside primary crowbar.

Use Value: Low clamping ratio (1.39× V_BR) and stable V_BR tolerance (±5 %) ensure predictable energy diversion during rapid bus collapse.

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient voltage suppression applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMBJ45A	Lower peak power (600 W), SMC package, same V_WM (45 V), higher V_C (73.5 V)	Targeted for space-constrained PCBs; unsuitable for 5 kV-level IEC 61000-4-5 compliance.	Select SMBJ45A only when board area is critical and surge energy is limited to <100 J.
1.5KE43A	Same P600 package, lower PPPM (1500 W), V_WM = 43 V, V_C = 69.4 V at 21.7 A	Legacy design replacement; lacks AEC-Q101 qualification and derated for high-temp automotive use.	Choose 1.5KE43A only for cost-sensitive commercial applications where 5000 W capability is not required.

Compared with SMBJ45A and 1.5KE43A, the 5KP45A-E3/51 delivers 3.3× higher surge power handling and automotive-grade reliability - making it the sole option among the three qualified for under-hood ECU protection and industrial 48 V systems requiring sustained 175 °C operation.

Availability

5KP45A-E3/51 is available at Aetrix Electronics and suitable for automotive ECU protection, industrial motor drive control, telecom DC feed protection, and renewable energy inverter DC link safeguarding requiring stable component supply across multi-year production cycles.

Supply support for 5KP45A-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, rectifiers, MOSFETs, and protection devices with emphasis on high-reliability, high-power, and automotive-qualified solutions.

The 5KP series was engineered specifically for high-energy transient suppression in switching power supply outputs and industrial power rails - delivering robust crowbar-circuit replacement with validated AEC-Q101 performance.

FAQ

What is the clamping voltage of the 5KP45A-E3/51 under maximum rated surge current?

The 5KP45A-E3/51 has a maximum clamping voltage (V_C) of 72.7 V at its rated peak pulse current (I_PPM) of 68.8 A, measured using the standard 10/1000 μs waveform. This value is guaranteed per JEDEC test conditions and defines the upper voltage limit imposed on protected circuits during surge events. The 5KP45A-E3/51 maintains this clamping performance across its full operating temperature range.

Is the 5KP45A-E3/51 suitable for automotive applications?

Yes, the 5KP45A-E3/51 is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood environments. Its 175 °C maximum junction temperature, robust P600 package, and validation across temperature cycling, humidity, and mechanical shock make it appropriate for engine control units, ADAS modules, and body electronics. The 5KP45A-E3/51 meets automotive surge immunity requirements per ISO 7637-2 and IEC 61000-4-5.

What does the "E3/51" suffix indicate in 5KP45A-E3/51?

The "E3" denotes RoHS-compliant, commercial-grade construction with JESD201 Class 1A whisker testing; "/51" specifies the packaging variant - in this case, 500 pieces per 13" diameter paper tape and reel. This differs from /54 (800-piece reel) and confirms the 5KP45A-E3/51 is supplied in industry-standard surface-mount-compatible tape-and-reel format despite its axial-leaded P600 package.

How does the 5KP45A-E3/51 compare to bidirectional TVS diodes?

The 5KP45A-E3/51 is unidirectional and intended for DC line protection where polarity is fixed - such as +45 V power rails. Unlike bidirectional variants, it blocks reverse voltage up to −45 V but conducts only in reverse avalanche mode. This yields lower leakage and tighter V_BR tolerance than bidirectional equivalents. For AC or floating-rail applications, a bidirectional part like 5KP45CA would be required instead of the 5KP45A-E3/51.

Can the 5KP45A-E3/51 replace older 1.5KE-series TVS diodes?

The 5KP45A-E3/51 offers significantly higher surge capability (5000 W vs. 1500 W for 1.5KE43A) and AEC-Q101 qualification, but direct replacement requires verification of layout clearance, thermal mass, and clamping margin. While both use P600 packages, the 5KP45A-E3/51 draws more heat during clamping; adequate copper pour and mounting surface are essential. The 5KP45A-E3/51 is not a drop-in substitute without thermal and electrical revalidation.

5KP45A-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):: 45V

Voltage - Breakdown (Min):: 50V

Voltage - Clamping (Max) @ Ipp:: 72.7V

Current - Peak Pulse (10/1000µs):: 68.8A

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

5KP45A-E3/51 FAQ

1.How can I place an order for 5KP45A-E3/51 through Aetrix?

Please submit a Request for Quotation (RFQ) for 5KP45A-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 5KP45A-E3/51 reliable?

The price and inventory of 5KP45A-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 5KP45A-E3/51 is usually 5 days.

3.What payment methods are accepted for 5KP45A-E3/51?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 5KP45A-E3/51 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 5KP45A-E3/51?

5KP45A-E3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 5KP45A-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 5KP45A-E3/51?

For technical support, including 5KP45A-E3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 5KP45A-E3/51 requirements.

6.How does Aetrix verify that 5KP45A-E3/51 is sourced from the original manufacturer or authorized distributors?

All 5KP45A-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 5KP45A-E3/51 meets industry standards.

7.What is the process for return or replacement of 5KP45A-E3/51?

All 5KP45A-E3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 5KP45A-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 5KP45A-E3/51 part is unused and in its original packaging.

Return procedure for 5KP45A-E3/51:

1.Submit a request within 90 days.

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

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