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

Vishay General Semiconductor - Diodes Division 5KP85A-E3/51

Name: 5KP85A-E3/51
Brand: Vishay General Semiconductor - Diodes Division
SKU: 5KP85A-E3/51
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 5KP85A-E3/51

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

Package:: P600, Axial

Datasheet:: 5KP85A-E3/51.pdf

Description:: TVS DIODE 85VWM 137VC P600

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Product details

Overview

5KP85A-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), 85 V stand-off voltage (V_WM), and 137 V maximum clamping voltage (V_C) at 36.5 A peak pulse current. It protects MOSFETs, ICs, and sensor signal lines in automotive and industrial power supplies.

For engineers reviewing the 5KP85A-E3/51 datasheet, 5KP85A-E3/51 pinout, 5KP85A-E3/51 application, or 5KP85A-E3/51 equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 175 °C max junction temperature, low incremental surge resistance, and compatibility with 275 °C solder dip per JESD 22-B106.

Technical Context

This TVS diode uses a glass-passivated P600 chip junction to achieve fast response time and excellent clamping performance under repetitive 10/1000 μs transients. Its unidirectional architecture provides forward conduction capability up to 100 A (V_F = 3.5 V), enabling crowbar-like overvoltage shutdown without external triggering.

Designed for switching power supply output protection, it withstands high peak currents while allowing upstream fuses or breakers to operate - requiring adequate heatsinking per the power derating curve (8.0 W at T_L = 75 °C). The 0.110 %/°C V_BR temperature coefficient ensures stable breakdown behavior across -55 °C to +175 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	85 V - Maximum continuous reverse operating voltage before clamping begins
V_BR min/max	94.4 V / 104 V at 5.0 mA - Confirmed breakdown range ensuring reliable turn-on margin above V_WM
V_C @ I_PPM	137 V at 36.5 A - Clamping voltage limits downstream device stress during 5000 W surge
P_PPM	5000 W - Peak pulse power handling with 10/1000 μs waveform, 0.01 % duty cycle
I_FSM	600 A - Non-repetitive forward surge rating (8.3 ms half-sine), supports crowbar operation
T_J max	+175 °C - Enables use in under-hood automotive and high-temperature industrial environments
Leakage @ V_WM	2.0 μA - Low reverse leakage preserves system efficiency in standby modes

Pinout & Package

The 5KP85A-E3/51 is housed in a P600 molded epoxy package (JEDEC DO-201AD outline) with matte tin-plated leads. Cathode is marked by a color band on the body. Leads are solderable per J-STD-002 and JESD 22-B102; compliant with JESD 201 class 1A whisker test.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry / Surge return path	Connected to ground or low-side reference; carries full IPPM during clamping
Cathode	Protected line connection / Surge injection point	Connected to line being protected (e.g., DC bus); color band identifies this terminal

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing
5000 W peak pulse power	Enables single-device protection against ISO 7637-2 Pulse 5a/b and IEC 61000-4-5 Level 4 surges
Low incremental surge resistance	Minimizes V_C overshoot and improves clamping precision under high di/dt conditions
UL 94 V-0 molding compound	Ensures flame-retardant enclosure integrity in safety-critical power systems
RoHS-compliant (E3 suffix)	Meets EU Directive 2011/65/EU with no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE

Applications

Automotive Power Supply Protection	Industrial DC Bus Clamping
Use Scenario: Protecting 12 V/24 V vehicle electronics (ECUs, sensors) from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and protected circuit input. Use Value: Clamps to 137 V within nanoseconds, limiting stress on downstream 36 V-rated regulators and microcontrollers.	Use Scenario: Safeguarding PLC I/O modules and motor drives against inductive switching spikes on 48–72 V DC buses. IC Role / Device Role / Timing Role: High-power shunt protector mounted directly across bus rails with thermal pad to heatsink. Use Value: Absorbs 5000 W surges without failure, enabling fuse coordination and system reset after fault clearance.
Telecom Rectifier Output Protection	Computer PSU Overvoltage Crowbar
Use Scenario: Securing -48 V telecom rectifier outputs against lightning-induced surges and hot-swap transients. IC Role / Device Role / Timing Role: Cathode tied to -48 V rail, anode grounded; leverages unidirectional conduction for negative-rail suppression. Use Value: 175 °C TJ max allows operation in sealed cabinets; 2.0 μA leakage avoids battery drain in backup systems.	Use Scenario: Replacing SCR-based crowbar circuits in ATX and server PSUs to prevent catastrophic overvoltage damage. IC Role / Device Role / Timing Role: Fast-acting shunt element triggered by OVP comparator; conducts full output short until fuse blows. Use Value: 600 A I_FSM rating sustains conduction long enough for mechanical fuse interruption, avoiding latch-up.

Automotive Power Supply Protection

Industrial DC Bus Clamping

Use Scenario: Protecting 12 V/24 V vehicle electronics (ECUs, sensors) from load dump and alternator transients.

IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and protected circuit input.

Use Value: Clamps to 137 V within nanoseconds, limiting stress on downstream 36 V-rated regulators and microcontrollers.

Use Scenario: Safeguarding PLC I/O modules and motor drives against inductive switching spikes on 48–72 V DC buses.

IC Role / Device Role / Timing Role: High-power shunt protector mounted directly across bus rails with thermal pad to heatsink.

Use Value: Absorbs 5000 W surges without failure, enabling fuse coordination and system reset after fault clearance.

Telecom Rectifier Output Protection

Computer PSU Overvoltage Crowbar

Use Scenario: Securing -48 V telecom rectifier outputs against lightning-induced surges and hot-swap transients.

IC Role / Device Role / Timing Role: Cathode tied to -48 V rail, anode grounded; leverages unidirectional conduction for negative-rail suppression.

Use Value: 175 °C TJ max allows operation in sealed cabinets; 2.0 μA leakage avoids battery drain in backup systems.

Use Scenario: Replacing SCR-based crowbar circuits in ATX and server PSUs to prevent catastrophic overvoltage damage.

IC Role / Device Role / Timing Role: Fast-acting shunt element triggered by OVP comparator; conducts full output short until fuse blows.

Use Value: 600 A I_FSM rating sustains conduction long enough for mechanical fuse interruption, avoiding latch-up.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMBJ85A	Lower PPPM (600 W), smaller SMB package, same V_WM/V_C but higher clamping ratio	Not suitable for load dump or IEC 61000-4-5 Level 4; limited to board-level ESD/surge	Select when space-constrained and surge energy ≤ 600 W
1.5KE85A	Same P600 package and V_WM, but lower PPPM (1500 W), higher V_C (145 V), non-AEC-Q101	Lacks automotive qualification and thermal robustness for under-hood deployment	Select for cost-sensitive industrial designs where 5000 W rating is unnecessary

Compared with SMBJ85A and 1.5KE85A, the 5KP85A-E3/51 delivers 3.3× higher surge power handling, AEC-Q101 validation, and tighter clamping - making it the only choice for automotive load dump and high-energy industrial transients where system reliability is non-negotiable.

Availability

5KP85A-E3/51 is available at Aetrix Electronics and suitable for automotive electronics, industrial motor drives, telecom rectifiers, and server power supplies requiring stable component supply across extended product lifecycles.

Supply support for 5KP85A-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, and protection devices with emphasis on reliability, power handling, and automotive qualification.

The 5KP series was engineered specifically for high-energy transient suppression in switching power supply outputs - delivering robust crowbar replacement capability with validated AEC-Q101 performance and UL 94 V-0 safety compliance.

FAQ

What is the clamping voltage of the 5KP85A-E3/51 under maximum surge conditions?

The 5KP85A-E3/51 has a maximum clamping voltage (V_C) of 137 V at its rated peak pulse current (I_PPM) of 36.5 A, measured using the standard 10/1000 μs waveform. This value is guaranteed per JEDEC registered test conditions and defines the upper voltage limit imposed on protected circuitry during a 5000 W transient event. The 5KP85A-E3/51 maintains this clamping performance across its specified operating temperature range.

Is the 5KP85A-E3/51 suitable for automotive applications?

Yes, the 5KP85A-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 against temperature cycling, HTRB, and ESD make it appropriate for protecting ECUs, ADAS sensors, and powertrain control modules from load dump and ISO 7637-2 transients. The 5KP85A-E3/51 meets automotive reliability requirements without derating.

What does the "E3/51" suffix indicate in 5KP85A-E3/51?

The "E3" suffix denotes RoHS-compliant construction with matte tin-plated leads and JESD 201 class 1A whisker resistance; "/51" specifies the packaging configuration - in this case, 500 pieces per 13-inch diameter paper tape and reel. This ordering code ensures traceability, solderability per J-STD-002, and compatibility with automated SMT placement equipment. The 5KP85A-E3/51 is not a sample or evaluation variant - it is the full-production commercial-grade part.

How does the 5KP85A-E3/51 compare to bidirectional TVS diodes?

The 5KP85A-E3/51 is unidirectional only, meaning it conducts in forward bias like a rectifier and clamps only in reverse. Unlike bidirectional types, it provides low forward voltage drop (3.5 V at 100 A), enabling crowbar functionality in power supply outputs. Bidirectional alternatives cannot replicate this forward conduction behavior and exhibit higher capacitance - making the 5KP85A-E3/51 preferred for DC bus protection where polarity is fixed and surge energy is high.

Can the 5KP85A-E3/51 replace a 1.5KE85A in an existing design?

The 5KP85A-E3/51 shares the same P600 package and V_WM (85 V) as the 1.5KE85A but offers 3.3× higher peak pulse power (5000 W vs. 1500 W) and lower clamping voltage (137 V vs. 145 V). While mechanically compatible, direct substitution requires verifying PCB thermal relief, fuse coordination, and system-level surge test compliance - especially in automotive applications where AEC-Q101 qualification of the 5KP85A-E3/51 adds critical reliability assurance beyond the 1.5KE85A.

5KP85A-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):: 85V

Voltage - Breakdown (Min):: 94.4V

Voltage - Clamping (Max) @ Ipp:: 137V

Current - Peak Pulse (10/1000µs):: 36.5A

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

5KP85A-E3/51 FAQ

1.How can I place an order for 5KP85A-E3/51 through Aetrix?

Please submit a Request for Quotation (RFQ) for 5KP85A-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 5KP85A-E3/51 reliable?

The price and inventory of 5KP85A-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 5KP85A-E3/51 is usually 5 days.

3.What payment methods are accepted for 5KP85A-E3/51?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 5KP85A-E3/51 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 5KP85A-E3/51?

5KP85A-E3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 5KP85A-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 5KP85A-E3/51?

For technical support, including 5KP85A-E3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 5KP85A-E3/51 requirements.

6.How does Aetrix verify that 5KP85A-E3/51 is sourced from the original manufacturer or authorized distributors?

All 5KP85A-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 5KP85A-E3/51 meets industry standards.

7.What is the process for return or replacement of 5KP85A-E3/51?

All 5KP85A-E3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 5KP85A-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 5KP85A-E3/51 part is unused and in its original packaging.

Return procedure for 5KP85A-E3/51:

1.Submit a request within 90 days.

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

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