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Vishay General Semiconductor - Diodes Division 5KP78AHE3_A/C
- Part No.:
- 5KP78AHE3_A/C
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- P600, Axial
- Datasheet:
-
5KP78AHE3_A/C.pdf
- Description:
- TVS DIODE
- Quantity:
- Payment:
- Shipping:
Inventory:2,901
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Product details
Overview
5KP78AHE3_A/C from Vishay General Semiconductor is a unidirectional 5000 W transient voltage suppressor (TVS) diode in P600 package, designed for high-energy surge protection with 78 V stand-off voltage, 86.7–95.8 V breakdown range at 5 mA, and 126 V clamping voltage at 39.7 A peak pulse current. It is AEC-Q101 qualified and used to protect automotive power supplies and industrial sensor signal lines against lightning and inductive switching transients.
For engineers reviewing the 5KP78AHE3_A/C datasheet, 5KP78AHE3_A/C pinout, 5KP78AHE3_A/C application, or 5KP78AHE3_A/C equivalent, key selection criteria include its 5000 W 10/1000 μs pulse rating, unidirectional polarity, P600 package thermal performance, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
The 5KP78AHE3_A/C employs a glass-passivated P600 chip junction optimized for fast response (<1 ns) and low incremental surge resistance, enabling precise clamping during high-dI/dt events. Its unidirectional architecture provides reverse-biased overvoltage protection only, with no forward conduction beyond VF = 3.5 V at 100 A.
Thermal design relies on lead temperature derating: power dissipation drops from 8.0 W at TL = 75 °C to zero at TL = 175 °C, requiring adequate PCB copper area or heatsinking for repetitive surge conditions. The device operates across -55 °C to +175 °C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 78.0 V - Maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 86.7–95.8 V at 5 mA - Confirmed breakdown range ensures reliable triggering above normal operating voltage. |
| VC (Clamping Voltage) | 126 V at IPPM = 39.7 A - Peak voltage seen by protected circuit during 10/1000 μs surge; determines downstream component stress. |
| PPPM (Peak Pulse Power) | 5000 W - Sustains single 10/1000 μs surges up to this energy level without failure; enables robust lightning strike immunity. |
| IFSM (Surge Current) | 500 A - Withstands 8.3 ms half-sine surge, supporting crowbar-style fault clearing in power supply outputs. |
| TJ max. | +175 °C - Enables operation in under-hood automotive environments and high-ambient industrial enclosures. |
| Polarity | Unidirectional - Protects against reverse-polarity transients only; cathode marked by color band. |
Pinout & Package
Package: P600 molded epoxy case with matte tin-plated leads, UL 94 V-0 rated, RoHS compliant, AEC-Q101 qualified. Dimensions: 9.5 mm × 9.1 mm × 1.32 mm (L × W × H), lead spacing 9.1 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path | Connected to system ground or lower potential node; conducts during positive surge events when cathode is at higher potential. |
| Cathode | Protected line connection | Connected to line being protected (e.g., 12 V rail); clamps reverse transients by avalanching at VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive powertrain and body electronics per stress test requirements including HTOL, TCT, and ESD. |
| 5000 W 10/1000 μs pulse rating | Supports IEC 61000-4-5 Level 4 (4 kV) surge immunity without external series impedance in many configurations. |
| Low clamping ratio (VC/VBR ≈ 1.31) | Minimizes overvoltage overshoot during surge, reducing stress on downstream MOSFETs and controllers. |
| P600 thermal mass & solderability | Enables 275 °C/10 s solder dip and supports >8 W dissipation on infinite heatsink at TL = 75 °C. |
| Color-band cathode marking | Ensures unambiguous polarity identification during manual assembly and automated optical inspection (AOI). |
Applications
| Automotive Power Supply Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp negative-going spikes. Use Value: Withstands 5000 W surges while limiting clamped voltage to 126 V, preventing damage to 36 V-rated DC-DC converters and microcontrollers. |
Use Scenario: Shielding analog output lines of pressure/temperature sensors in factory automation systems. IC Role / Device Role / Timing Role: TVS connected across differential pair or single-ended signal-to-ground to absorb ESD and switching noise. Use Value: Fast <1 ns response and 2 μA leakage at 78 V preserve signal integrity and minimize offset error in precision 4–20 mA loops. |
| Switching Power Supply Output Clamping | Telecom DC Feeder Protection |
|
Use Scenario: Replacing crowbar circuits on 48 V telecom rectifier outputs to avoid permanent shutdown during overvoltage. IC Role / Device Role / Timing Role: TVS shunts excess energy during transient overvoltage, allowing fuse/breaker time to clear fault while preserving system uptime. Use Value: 500 A IFSM rating enables survival of sustained overloads; 8.0 W steady-state dissipation supports thermal recovery between events. |
Use Scenario: Safeguarding central office line cards from lightning-induced surges on -48 V DC feeder lines. IC Role / Device Role / Timing Role: Unidirectional TVS installed at board edge, cathode to -48 V rail, anode to ground. Use Value: 126 V clamping ensures protected ICs see no more than -48 V − 126 V = -174 V worst-case, within safe isolation limits of interface ICs. |
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 78 V VWM, but 400 W PPPM (SMA package), 10× lower pulse power rating. | Suitable for low-energy ESD-only protection; insufficient for IEC 61000-4-5 Level 3+ surges. | Select 5KP78AHE3_A/C when 5000 W surge handling is required; SMAJ78A only for space-constrained, low-power nodes. |
| ON Semiconductor 1.5KE78A | Same VWM and unidirectional polarity, but 1500 W PPPM (DO-201 package), 70 % lower pulse power. | Limited to medium-energy transients; requires series impedance for full lightning protection. | Choose 5KP78AHE3_A/C where direct-coupled, high-current surge immunity is mandatory-e.g., automotive battery inputs. |
Compared with SMAJ78A and 1.5KE78A, the 5KP78AHE3_A/C delivers 3.3× and 3.3× higher peak pulse power respectively, enabling direct protection of high-power rails without external current-limiting resistors or additional stages.
Availability
5KP78AHE3_A/C is available at Aetrix Electronics and suitable for automotive power distribution units, industrial PLC I/O modules, telecom rectifier outputs, and sensor interface circuits requiring stable component supply and long-term lifecycle support.
Supply support for 5KP78AHE3_A/C 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 automotive and industrial power systems, targeting replacement of mechanical crowbar circuits with solid-state robustness and resettable operation.
FAQ
What is the clamping voltage of the 5KP78AHE3_A/C under maximum rated surge current?
The 5KP78AHE3_A/C clamps to 126 V when subjected to its peak pulse current of 39.7 A under the standard 10/1000 μs waveform. This value is measured and guaranteed per JEDEC test conditions and defines the maximum voltage imposed on protected circuitry during surge events. The 5KP78AHE3_A/C maintains this clamping performance across its specified operating temperature range.
Is the 5KP78AHE3_A/C suitable for bidirectional transient protection?
No, the 5KP78AHE3_A/C is unidirectional only, with polarity indicated by a cathode color band. It protects against reverse-biased transients only. For bidirectional protection, a separate symmetric TVS or back-to-back configuration would be required. The 5KP78AHE3_A/C datasheet explicitly states "Available in unidirectional polarity only" and does not specify forward surge capability beyond the 3.5 V VF rating.
Does the 5KP78AHE3_A/C meet automotive qualification standards?
Yes, the 5KP78AHE3_A/C carries the HE3 suffix, confirming AEC-Q101 qualification per Vishay's ordering nomenclature. This includes testing for high-temperature operating life, temperature cycling, and electrostatic discharge robustness required for automotive powertrain and body electronics. The 5KP78AHE3_A/C is rated for operation from -55 °C to +175 °C junction temperature.
What is the maximum steady-state power dissipation for the 5KP78AHE3_A/C?
The 5KP78AHE3_A/C has a maximum power dissipation (PD) of 8.0 W when mounted on an infinite heatsink at a lead temperature (TL) of 75 °C. This rating decreases linearly to zero at TL = 175 °C per the derating curve in Figure 5 of the datasheet. Continuous dissipation must remain within this limit to avoid thermal runaway or parametric shift.
How is the polarity identified on the 5KP78AHE3_A/C package?
The 5KP78AHE3_A/C uses a color band (typically black or dark stripe) on the cathode end of the P600 package to indicate polarity. This marking aligns with JEDEC standard orientation and is visible on both sides of the molded epoxy body. The anode is the opposite end, and correct orientation is critical-reversal renders the device ineffective for reverse-transient suppression. The 5KP78AHE3_A/C datasheet confirms "Polarity: color band denotes cathode end."
5KP78AHE3_A/C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- P600, Axial
- Series:
- TransZorb®
- Packaging:
- Bulk
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- P600
5KP78AHE3_A/C FAQ
1.How can I place an order for 5KP78AHE3_A/C through Aetrix?
Please submit a Request for Quotation (RFQ) for 5KP78AHE3_A/C 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 5KP78AHE3_A/C reliable?
The price and inventory of 5KP78AHE3_A/C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 5KP78AHE3_A/C is usually 5 days.
3.What payment methods are accepted for 5KP78AHE3_A/C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 5KP78AHE3_A/C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 5KP78AHE3_A/C?
5KP78AHE3_A/C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 5KP78AHE3_A/C 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 5KP78AHE3_A/C?
For technical support, including 5KP78AHE3_A/C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 5KP78AHE3_A/C requirements.
6.How does Aetrix verify that 5KP78AHE3_A/C is sourced from the original manufacturer or authorized distributors?
All 5KP78AHE3_A/C 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 5KP78AHE3_A/C meets industry standards.
7.What is the process for return or replacement of 5KP78AHE3_A/C?
All 5KP78AHE3_A/C units undergo pre-shipment inspection (PSI). If there is an issue with 5KP78AHE3_A/C, 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 5KP78AHE3_A/C part is unused and in its original packaging.
Return procedure for 5KP78AHE3_A/C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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