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Vishay General Semiconductor - Diodes Division 1N6378HE3/51
- Part No.:
- 1N6378HE3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1N6378HE3/51.pdf
- Description:
- TVS DIODE 18VWM 25.2VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:9,049
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Product details
Overview
1N6378HE3/51 from Vishay General Semiconductor is a bi-directional TransZORB® transient voltage suppressor (TVS) diode in the 1.5KE case style, rated for 1500 W peak pulse power (10/1000 µs), 18.0 V stand-off voltage (VWM), 21.2 V minimum breakdown voltage (VBR), and 24.8 V maximum clamping voltage at 10 A. It is AEC-Q101 qualified and designed to protect sensitive signal lines and power rails in automotive and industrial electronics against ESD and inductive switching transients.
For engineers reviewing the 1N6378HE3/51 datasheet, 1N6378HE3/51 pinout, 1N6378HE3/51 application, or 1N6378HE3/51 equivalent, key selection criteria include its bi-directional clamping capability, 175 °C max junction temperature, 2.0 µA reverse leakage at VWM, RoHS-compliant matte tin-plated leads, and JESD 201 Class 2 whisker resistance - all critical for high-reliability board-level surge protection.
Technical Context
This device operates as a voltage-clamped shunt protector with symmetrical bi-directional conduction, enabling suppression of both positive and negative transients without polarity dependency. Its glass-passivated junction ensures stable VBR and low dynamic impedance, while the 1.5KE molded epoxy package provides UL 94 V-0 flammability compliance and mechanical robustness for reflow and wave soldering.
The 1N6378HE3/51 delivers consistent clamping performance across temperature: clamping factor is 1.33 at full rated power and improves to 1.20 at 50 % power, indicating tighter voltage control under partial stress. It supports repetitive surge events at ≤0.01 % duty cycle and withstands 200 A non-repetitive forward surge (8.3 ms half-sine) - essential for protecting MOSFET gates and sensor interfaces in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18.0 V - maximum continuous reverse operating voltage before clamping begins; sets system DC rail compatibility |
| VBR (min) | 21.2 V at 1.0 mA - guaranteed breakdown threshold; defines minimum overvoltage trigger point |
| VC @ 10 A | 24.8 V - clamping voltage during 10 A transient; determines protected circuit's worst-case overvoltage exposure |
| PPPM | 1500 W (10/1000 µs) - peak surge energy handling capacity; enables protection against IEC 61000-4-5 Level 4 surges |
| IR @ VWM | 2.0 µA - ultra-low reverse leakage; minimizes standby power loss and avoids false triggering in high-impedance nodes |
| TJ max | +175 °C - extended thermal operating range; supports under-hood automotive and industrial ambient conditions |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC standard |
Pinout & Package
Package: 1.5KE molded epoxy case (JEDEC DO-201AD), axial-leaded, bi-directional - no polarity marking required. Dimensions: 5.3 mm diameter × 9.5 mm body length, lead diameter 1.07 mm, lead length ≥25.4 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bi-directional current path | No functional distinction between leads; either terminal serves as input/output for transient energy diversion |
| Leads (matte tin plated) | PCB interface and thermal path | Solderable per J-STD-002/JESD 22-B102; supports 275 °C dip soldering (10 s); JESD 201 Class 2 whisker resistant |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term parameter consistency across thermal and humidity stress |
| 1500 W peak pulse power (10/1000 µs) | Provides robust immunity to lightning-induced surges and inductive kickback in 12 V/24 V systems |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, body control, and ADAS modules requiring zero-failure field reliability |
| UL 94 V-0 molding compound | Meets flame-retardancy requirements for enclosed industrial enclosures and safety-critical equipment housings |
| Low clamping factor (1.20–1.33) | Minimizes overvoltage overshoot during surge events, reducing risk of downstream IC latch-up or gate oxide damage |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ESD in vehicle ECUs. IC Role / Device Role / Timing Role: Bi-directional shunt clamp placed across differential signal pair or supply rail to divert transients to ground. Use Value: Withstands 200 A surge (8.3 ms) and maintains <2.0 µA leakage at 18 V, preserving signal integrity and minimizing quiescent current drain. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to relay coil flyback and motor drive noise. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected between channel and common reference to suppress ±1 kV EFT bursts per IEC 61000-4-4. Use Value: 24.8 V clamping at 10 A limits voltage excursion below 25 V, preventing damage to 24 V-rated optocouplers and level translators. |
| Telecom Line Interface | Consumer Power Adapter Input |
Use Scenario: Front-end surge protection on Ethernet PHY magnetics or DSL line drivers subjected to induced lightning surges. IC Role / Device Role / Timing Role: Bi-directional TVS placed across transformer secondary windings to clamp common-mode transients. Use Value: 1500 W rating handles 10/1000 µs surges up to 1.5 kW; 175 °C TJ max ensures operation in sealed telecom cabinets. |
Use Scenario: Secondary-side overvoltage clamp on AC-DC adapter outputs to prevent damage during output short-circuit recovery. IC Role / Device Role / Timing Role: Shunt protector across regulated 12 V or 19 V output rail to absorb regulator overshoot and capacitor discharge energy. Use Value: 18.0 V VWM aligns with 12 V nominal +20 % margin; 24.8 V VC prevents downstream LDO or USB-PD controller overvoltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA | Lower peak power (600 W), smaller SMB package (3.5 mm × 4.5 mm), same 18 V VWM and bi-directional configuration | Better suited for space-constrained PCBs; limited to lower-energy transients (e.g., IEC 61000-4-2 ESD only) | Select when board area is critical and surge threat level is ≤600 W; verify thermal derating in confined layouts |
| 1.5KE18CA | Identical 1.5KE package, 1500 W rating, and electrical specs - differs only in suffix coding (no HE3 qualification) | Lacks AEC-Q101 qualification and JESD 201 Class 2 whisker resistance; not approved for automotive use | Acceptable for commercial/industrial designs where automotive reliability is not mandated; lower cost alternative |
Compared with SMBJ18CA and 1.5KE18CA, the 1N6378HE3/51 uniquely combines AEC-Q101 qualification, JESD 201 Class 2 whisker resistance, and full 1500 W surge capability in the proven 1.5KE form factor - making it the preferred choice for automotive and mission-critical industrial deployments where long-term reliability under thermal and mechanical stress is non-negotiable.
Availability
1N6378HE3/51 is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom line interface circuits requiring stable component supply, AEC-Q101 compliance, and repeatable surge protection performance across production batches.
Supply support for 1N6378HE3/51 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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The 1N6378HE3/51 belongs to Vishay's TransZORB® 1.5KE family - engineered specifically for high-energy transient suppression in automotive, industrial, and telecom infrastructure where failure due to voltage surges must be eliminated.
FAQ
What is the polarity configuration of the 1N6378HE3/51?
The 1N6378HE3/51 is a bi-directional TVS diode with symmetrical terminals - neither lead is designated anode or cathode. This allows it to clamp both positive and negative transients equally without regard to orientation on the PCB. The device carries no color band or marking, consistent with JEDEC bi-directional part conventions. Its VBR and VC values apply identically in both directions, as confirmed in the Vishay 88356 datasheet.
Is the 1N6378HE3/51 suitable for automotive applications?
Yes, the 1N6378HE3/51 is AEC-Q101 qualified, meaning it has passed rigorous stress tests including temperature cycling, high-temperature reverse bias, and ESD per automotive standards. Its 175 °C maximum junction temperature, JESD 201 Class 2 whisker resistance, and RoHS-compliant matte tin plating make it appropriate for under-hood and chassis-mounted automotive modules. The 1N6378HE3/51 is explicitly listed in Vishay's AEC-Q101 qualified product table.
What is the maximum clamping voltage of the 1N6378HE3/51 at 10 A?
The maximum clamping voltage (VC) of the 1N6378HE3/51 at 10 A peak pulse current is 24.8 V, measured using the standard 10/1000 µs waveform. This value is specified in the "ELECTRICAL CHARACTERISTICS" table of the Vishay document 88356 and defines the upper voltage limit imposed on protected circuitry during a 10 A transient event. It directly informs design margin calculations for downstream components.
How does the 1N6378HE3/51 differ from the standard 1N6378E3/51?
The 1N6378HE3/51 differs from the 1N6378E3/51 by its whisker resistance qualification: the "H" suffix denotes compliance with JESD 201 Class 2 (vs. Class 1A for "E3"), providing enhanced resistance to tin whisker growth under thermal cycling and humidity stress. Both share identical electrical specs, 1.5KE package, and RoHS compliance, but only the 1N6378HE3/51 is approved for automotive and high-reliability industrial use per Vishay's ordering documentation.
What is the reverse leakage current of the 1N6378HE3/51 at its stand-off voltage?
The reverse leakage current (IR) of the 1N6378HE3/51 is 2.0 µA maximum at its 18.0 V stand-off voltage (VWM) and 25 °C ambient temperature. This low leakage ensures minimal power loss in always-on circuits and avoids false triggering in high-impedance sensing nodes. The value is guaranteed per JEDEC registered data in the Vishay 88356 datasheet and applies to both polarities due to its bi-directional construction.
1N6378HE3/51 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- TransZorb®
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 21.2V
- Voltage - Clamping (Max) @ Ipp:
- 25.2V
- Current - Peak Pulse (10/1000µs):
- 50A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 1.5KE
1N6378HE3/51 FAQ
1.How can I place an order for 1N6378HE3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6378HE3/51 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 1N6378HE3/51 reliable?
The price and inventory of 1N6378HE3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6378HE3/51 is usually 5 days.
3.What payment methods are accepted for 1N6378HE3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6378HE3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6378HE3/51?
1N6378HE3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6378HE3/51 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 1N6378HE3/51?
For technical support, including 1N6378HE3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6378HE3/51 requirements.
6.How does Aetrix verify that 1N6378HE3/51 is sourced from the original manufacturer or authorized distributors?
All 1N6378HE3/51 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 1N6378HE3/51 meets industry standards.
7.What is the process for return or replacement of 1N6378HE3/51?
All 1N6378HE3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1N6378HE3/51, 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 1N6378HE3/51 part is unused and in its original packaging.
Return procedure for 1N6378HE3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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