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Vishay General Semiconductor - Diodes Division 5KP78A-E3/54
- Part No.:
- 5KP78A-E3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- P600, Axial
- Datasheet:
-
5KP78A-E3/54.pdf
- Description:
- TVS DIODE 78VWM 126VC P600
- Quantity:
- Payment:
- Shipping:
Inventory:1,179
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Product details
Overview
5KP78A-E3/54 from Vishay General Semiconductor is a unidirectional TransZORB® transient voltage suppressor (TVS) diode in P600 package, designed for primary overvoltage protection of DC power rails and signal lines. It features 78 V stand-off voltage (VWM), 86.7–95.8 V breakdown voltage (VBR) at 5 mA, 126 V maximum clamping voltage (VC) at 39.7 A peak pulse current (IPPM), and 5000 W peak pulse power (10/1000 μs). It is AEC-Q101 qualified and used in automotive power supply input stages.
For engineers reviewing the 5KP78A-E3/54 datasheet, 5KP78A-E3/54 pinout, 5KP78A-E3/54 application, or 5KP78A-E3/54 equivalent, key selection criteria include clamping voltage margin vs. protected IC's absolute maximum rating, peak surge current capability under lightning-induced transients, thermal derating above 25 °C, and compliance with AEC-Q101 for automotive under-hood deployment.
Technical Context
This TVS operates as a shunt-clamping device triggered by reverse-biased avalanche breakdown. Its P600 glass-passivated junction enables robust 5000 W surge handling with low incremental surge resistance (typ. <0.3 Ω) and sub-nanosecond response time - critical for suppressing fast-rising ESD and load-dump transients.
It is rated for unidirectional polarity only (cathode band marked), with 2.0 μA max reverse leakage at 78 V and 175 °C max junction temperature. Derating begins above 25 °C ambient, requiring heatsinking or layout-aware thermal management when deployed in high-duty-cycle industrial or automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 78.0 V - Maximum continuous reverse voltage before significant leakage; sets upper limit for normal operating rail voltage. |
| VBR (Breakdown Voltage) | 86.7–95.8 V at 5 mA - Avalanche onset range; defines minimum trigger threshold under standardized test conditions. |
| VC (Clamping Voltage) | 126 V at 39.7 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case surge; must stay below downstream IC's absolute max rating. |
| PPPM (Peak Pulse Power) | 5000 W - Surge energy absorption capacity per single 10/1000 μs waveform; validates suitability for ISO 7637-2 Pulse 5a/b load-dump events. |
| IFSM (Surge Current) | 500 A (8.3 ms half-sine) - Non-repetitive forward surge rating; supports crowbar-style fault clearing in power supply outputs. |
| TJ max. | 175 °C - Maximum junction temperature; enables operation in under-hood automotive zones with proper PCB copper area. |
| Polarity | Unidirectional - Cathode-band marked; protects against positive transients only; requires correct orientation in series with protected line. |
Pinout & Package
Package: P600 molded epoxy case with glass-passivated chip junction; matte tin-plated leads; RoHS-compliant (E3 suffix); UL 94 V-0 rated molding compound; cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-voltage return path; completes clamping loop during reverse transient. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., battery rail); avalanche conduction occurs from cathode to anode during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive under-hood use including temperature cycling, humidity, and mechanical shock per stress test requirements. |
| 5000 W peak pulse power (10/1000 μs) | Supports IEC 61000-4-5 Level 4 (4 kV) and ISO 7637-2 Pulse 5a (75 V/350 ms) without failure. |
| Low clamping ratio (VC/VBR ≈ 1.32) | Minimizes voltage overshoot during clamping - critical for protecting 80 V-rated MOSFETs and gate drivers. |
| Fast response time (<1 ns) | Engages before transient edge propagates into sensitive analog or digital circuitry; no external triggering required. |
| P600 package thermal performance | Dissipates 8.0 W on infinite heatsink at TL = 75 °C; enables reliable operation with ≥2 in² 2-oz copper pour on FR-4. |
Applications
| Automotive Power Input Protection | Industrial DC Power Rail Clamping |
|---|---|
|
Use Scenario: Protecting 24 V vehicle battery inputs against load-dump transients (ISO 7637-2 Pulse 5a, up to 120 V/400 ms). IC Role / Device Role: Shunt clamping TVS placed between battery rail and ground, upstream of DC/DC converter input. Use Value: Limits peak voltage to 126 V during 39.7 A surge, preventing damage to 100 V-input buck controllers and gate drivers. |
Use Scenario: Safeguarding 48 V telecom rectifier outputs from switching surges and lightning-induced spikes. IC Role / Device Role: Primary overvoltage clamp on secondary-side DC bus, coordinated with fuse and OVP circuitry. Use Value: Absorbs 5000 W transient energy without degradation, enabling system reset after fault clearance instead of catastrophic short. |
| Motor Drive Gate Driver Protection | Industrial Sensor Signal Line Guarding |
|
Use Scenario: Shielding high-side gate drivers in 48 V BLDC inverters from shoot-through-induced voltage spikes. IC Role / Device Role: Local clamping element across driver supply pins (VDD-to-GND), placed adjacent to driver IC. Use Value: Sub-ns response clamps transients before driver internal ESD structures fail, preserving PWM timing integrity. |
Use Scenario: Protecting 4–20 mA current-loop sensor interfaces in factory automation PLCs from EFT and surge coupling. IC Role / Device Role: Bidirectional protection not applicable - this unidirectional device used on supply side of loop-powered sensors. Use Value: Withstands repetitive 1 kV/500 Hz EFT bursts while maintaining <2 μA leakage at 24 V nominal, avoiding signal offset errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ78A | Same VWM (78 V), lower PPPM (400 W), DO-214AC package, 110 V VC at 22.5 A | Lower surge capacity; suitable only for low-energy ESD or EFT, not load-dump | Select 5KP78A-E3/54 when >1 kA surge current or ISO 7637-2 compliance is required. |
| ON Semiconductor 1.5KE78A | Same VWM (78 V), same P600 package, 5000 W rating, but 135 V VC at 37.0 A and no AEC-Q101 qualification | Lacks automotive qualification; higher clamping voltage reduces safety margin for 100 V-rated devices | Choose 5KP78A-E3/54 for automotive designs requiring validated reliability and tighter clamping. |
Compared with SMAJ78A and 1.5KE78A, the 5KP78A-E3/54 delivers superior surge robustness (5000 W), lower clamping voltage (126 V), and formal AEC-Q101 validation - making it the preferred choice for mission-critical automotive and industrial power rail protection where transient energy exceeds 100 mJ.
Availability
5KP78A-E3/54 is available at Aetrix Electronics and suitable for automotive power systems, industrial DC distribution networks, and motor control electronics requiring stable component supply and long-term lifecycle support.
Supply support for 5KP78A-E3/54 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, TVS, MOSFETs, and optoelectronics with emphasis on reliability and automotive-grade qualification.
The 5KP series was engineered specifically for high-energy transient suppression in automotive and industrial power supplies - delivering 5 kW surge capability in a cost-effective P600 package with AEC-Q101 validation.
FAQ
What is the clamping voltage of the 5KP78A-E3/54 under a 10/1000 μs surge?
The 5KP78A-E3/54 has a maximum clamping voltage (VC) of 126 V when subjected to its rated peak pulse current of 39.7 A using the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and represents the highest voltage the protected circuit will experience during such a transient event. The 5KP78A-E3/54 maintains this clamping performance across its specified operating temperature range, provided thermal design guidelines are followed.
Is the 5KP78A-E3/54 suitable for automotive applications?
Yes, the 5KP78A-E3/54 is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood environments. Its 175 °C maximum junction temperature, robust P600 package, and validated performance under load-dump (ISO 7637-2) and ESD stress make it appropriate for battery rail protection in ECUs, ADAS modules, and body control units. The 5KP78A-E3/54 meets the reliability and qualification requirements defined in the AEC-Q101 standard for discrete semiconductors.
How does the 5KP78A-E3/54 differ from the 5KP78CA variant?
The 5KP78A-E3/54 is unidirectional, while the 5KP78CA is bidirectional - meaning the latter clamps both positive and negative transients, whereas the 5KP78A-E3/54 only clamps positive surges relative to ground. The 5KP78A-E3/54 has a cathode band marking and is intended for DC rail protection; the CA version lacks polarity marking and suits AC-coupled or floating signal lines. Their VWM, VBR, and VC values differ accordingly, and they are not interchangeable without circuit review.
What is the maximum reverse leakage current for the 5KP78A-E3/54 at rated VWM?
At its 78.0 V stand-off voltage (VWM) and 25 °C ambient temperature, the 5KP78A-E3/54 exhibits a maximum reverse leakage current (ID) of 2.0 μA. This low leakage ensures minimal power loss and avoids interference with precision sensing or low-current standby modes in battery-powered systems. Leakage increases with temperature but remains within specification up to TJ = 175 °C per the device's derating curve.
Can the 5KP78A-E3/54 be used in parallel for higher surge handling?
No - the 5KP78A-E3/54 is not recommended for parallel operation due to parameter spread in VBR (86.7–95.8 V) and dynamic impedance, which causes uneven current sharing and potential thermal runaway. For higher surge capability, select a single higher-rated device (e.g., 5KP85A) or implement staged protection with upstream fusing. The 5KP78A-E3/54 is characterized and qualified as a standalone device; parallel use voids AEC-Q101 compliance and violates Vishay's application guidance.
5KP78A-E3/54 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- P600, Axial
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 78V
- Voltage - Breakdown (Min):
- 86.7V
- Voltage - Clamping (Max) @ Ipp:
- 126V
- Current - Peak Pulse (10/1000µs):
- 39.7A
- 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
5KP78A-E3/54 FAQ
1.How can I place an order for 5KP78A-E3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for 5KP78A-E3/54 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 5KP78A-E3/54 reliable?
The price and inventory of 5KP78A-E3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 5KP78A-E3/54 is usually 5 days.
3.What payment methods are accepted for 5KP78A-E3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 5KP78A-E3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 5KP78A-E3/54?
5KP78A-E3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 5KP78A-E3/54 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 5KP78A-E3/54?
For technical support, including 5KP78A-E3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 5KP78A-E3/54 requirements.
6.How does Aetrix verify that 5KP78A-E3/54 is sourced from the original manufacturer or authorized distributors?
All 5KP78A-E3/54 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 5KP78A-E3/54 meets industry standards.
7.What is the process for return or replacement of 5KP78A-E3/54?
All 5KP78A-E3/54 units undergo pre-shipment inspection (PSI). If there is an issue with 5KP78A-E3/54, 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 5KP78A-E3/54 part is unused and in its original packaging.
Return procedure for 5KP78A-E3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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