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Vishay General Semiconductor - Diodes Division 1N6278HE3/54
- Part No.:
- 1N6278HE3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1N6278HE3/54.pdf
- Description:
- TVS DIODE 16.2VWM 29.1VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:7,765
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Product details
Overview
1N6278HE3/54 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a 20 V nominal breakdown voltage (VBR = 19.0–21.0 V), 17.1 V stand-off voltage (VWM), 27.7 V maximum clamping voltage at 54.2 A peak pulse current, 1500 W peak pulse power rating (10/1000 µs), and operates across –55 °C to +175 °C junction temperature range - used in automotive power supply input stages and industrial sensor interface protection.
For engineers reviewing the 1N6278HE3/54 datasheet, 1N6278HE3/54 pinout, 1N6278HE3/54 application, or 1N6278HE3/54 equivalent, this page delivers verified electrical parameters, JEDEC 1.5KE package mechanical data, AEC-Q101 qualification status, thermal resistance (RθJL = 15.4 °C/W), and real-world clamping behavior under transient surge conditions.
Technical Context
This device implements a silicon avalanche junction structure with glass passivation for stable breakdown characteristics and low incremental surge resistance. Its unidirectional polarity enables cathode-referenced clamping on positive transients only, with a fast sub-nanosecond response time and 0.090 %/°C temperature coefficient of VBR.
The 1N6278HE3/54 is rated for 1500 W peak pulse power per 10/1000 µs waveform at 0.01 % duty cycle, supports 200 A non-repetitive forward surge current (8.3 ms half-sine), and exhibits 3.5 V maximum forward voltage at 100 A - confirming suitability for high-energy transient suppression without forward conduction losses compromising system efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 19.0 V / 21.0 V - ensures reliable avalanche initiation above normal operating voltage while avoiding false triggering |
| VWM | 17.1 V - defines maximum continuous reverse working voltage before leakage exceeds 1.0 µA |
| VC @ IPPM | 27.7 V - clamps 10/1000 µs surges up to 54.2 A, limiting downstream voltage stress to safe levels |
| PPPM | 1500 W - handles high-energy lightning-induced or inductive-switching transients without failure |
| IFSM | 200 A - withstands 8.3 ms half-sine surge events common in automotive load-dump scenarios |
| TJ max. | +175 °C - supports operation in under-hood automotive environments and high-ambient industrial enclosures |
| RθJL | 15.4 °C/W - enables effective heat transfer from junction to lead, critical for sustained surge duty cycles |
Pinout & Package
Package: JEDEC DO-201AD (Case Style 1.5KE), axial-leaded molded epoxy body with matte tin-plated leads; RoHS compliant and AEC-Q101 qualified (HE3 suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or low-side reference; completes clamping loop during positive transients |
| Cathode | Avalanche conduction terminal / protected line connection | Connected to the line being protected (e.g., 12 V rail); color band identifies this end |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures long-term stability of breakdown voltage and leakage performance across temperature and life cycles |
| 1500 W peak pulse power (10/1000 µs) | Provides robust protection against IEC 61000-4-5 Level 4 surges (4 kV line-to-ground) without derating |
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics modules |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage exposure to downstream ICs such as microcontrollers and CAN transceivers |
| JESD 201 class 2 whisker resistance | Guarantees reliability in high-vibration environments where tin whisker growth could cause short circuits |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and jump-start transients per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp positive surges above 17.1 V. Use Value: Limits peak voltage to ≤27.7 V during 54.2 A transients, preventing damage to 36 V-rated LDOs and MCU power pins. | Use Scenario: Shielding analog outputs of pressure sensors in factory automation systems from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS mounted at connector interface to shunt fast transients before reaching op-amp inputs. Use Value: Sub-nanosecond response ensures clamping occurs before sensitive amplifier stages experience overvoltage stress. |
| Telecom DC Power Feeds | Consumer Appliance Motor Drive Inputs |
Use Scenario: Safeguarding PoE-powered network switches against induced surges on 48 V DC input lines. IC Role / Device Role / Timing Role: Primary overvoltage clamp on DC input stage upstream of DC/DC converters. Use Value: 1500 W rating absorbs multiple 10/1000 µs surges without degradation, supporting multi-year field reliability. | Use Scenario: Protecting BLDC motor controller gate drivers from inductive kickback during MOSFET switching. IC Role / Device Role / Timing Role: Unidirectional TVS across high-side driver supply rail to clamp flyback spikes. Use Value: 200 A IFSM rating accommodates repetitive motor stall currents without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20A | Lower peak pulse power (600 W), smaller SMB package (vs. DO-201AD), higher VC/VBR ratio (1.47) | Not AEC-Q101 qualified; limited to commercial-grade consumer/industrial use | Select when board space is constrained and surge energy is ≤600 W; verify thermal margin due to higher RθJA |
| 1.5KE20A-E3/54 | Same electrical specs and DO-201AD package; differs only in qualification level (commercial grade vs. AEC-Q101) | Lacks automotive qualification; unsuitable for OEM automotive programs requiring PPAP documentation | Choose only for cost-sensitive non-automotive designs where AEC-Q101 is not mandated |
Compared with SMBJ20A and 1.5KE20A-E3/54, the 1N6278HE3/54 uniquely combines AEC-Q101 qualification, 1500 W surge capability, and DO-201AD mechanical robustness - making it the sole option for production automotive power rail protection requiring zero-layout change and full compliance traceability.
Availability
1N6278HE3/54 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, telecom DC power feeds, and appliance motor drive systems requiring stable component supply and full AEC-Q101 documentation support.
Supply support for 1N6278HE3/54 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, and protection devices with emphasis on reliability, ruggedness, and automotive-grade validation.
The 1N6278HE3/54 belongs to Vishay's TRANSZORB® family of high-power TVS diodes, engineered specifically for robust overvoltage protection in harsh environments where surge immunity and long-term parametric stability are mission-critical.
FAQ
What is the breakdown voltage tolerance for the 1N6278HE3/54?
The 1N6278HE3/54 has a specified breakdown voltage range of 19.0 V to 21.0 V at 1.0 mA test current (VBR min/max). This ±5.3 % tolerance ensures consistent clamping behavior across production lots while maintaining sufficient margin above its 17.1 V stand-off voltage to prevent premature conduction during normal operation.
Is the 1N6278HE3/54 suitable for bidirectional transient protection?
No, the 1N6278HE3/54 is a unidirectional TVS diode - it clamps only positive transients relative to its cathode. For bidirectional protection, Vishay offers variants with "CA" suffix (e.g., 1N6278CA), which are explicitly designed for AC or dual-polarity signal lines. Using the 1N6278HE3/54 in bidirectional configurations risks failure during negative excursions.
Does the 1N6278HE3/54 meet automotive qualification standards?
Yes, the HE3 suffix confirms that the 1N6278HE3/54 is AEC-Q101 qualified per Vishay's documentation (Document Number 88301, Revision 09-Aug-2022). This qualification covers stress tests including HTGB, HTRB, TCT, and ESD, validating its suitability for under-hood and body electronics applications in passenger vehicles and commercial vehicles.
What is the maximum clamping voltage of the 1N6278HE3/54 under surge conditions?
The 1N6278HE3/54 has a maximum clamping voltage (VC) of 27.7 V at its rated peak pulse current of 54.2 A (10/1000 µs waveform). This value is measured per standard test conditions and represents the upper limit of voltage seen by downstream circuitry during worst-case transient events - critical for ensuring compatibility with 30 V-rated components.
How does the thermal resistance of the 1N6278HE3/54 affect PCB layout?
The 1N6278HE3/54 has a typical junction-to-lead thermal resistance (RθJL) of 15.4 °C/W, meaning efficient heat transfer relies on direct copper pour connections to both leads. PCB layout should use ≥250 mil wide traces or thermal pads tied to internal ground planes to avoid junction overheating during repetitive surge events, especially in enclosed automotive enclosures.
1N6278HE3/54 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 16.2V
- Voltage - Breakdown (Min):
- 18V
- Voltage - Clamping (Max) @ Ipp:
- 29.1V
- Current - Peak Pulse (10/1000µs):
- 51.5A
- 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
1N6278HE3/54 FAQ
1.How can I place an order for 1N6278HE3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6278HE3/54 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 1N6278HE3/54 reliable?
The price and inventory of 1N6278HE3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6278HE3/54 is usually 5 days.
3.What payment methods are accepted for 1N6278HE3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6278HE3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6278HE3/54?
1N6278HE3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6278HE3/54 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 1N6278HE3/54?
For technical support, including 1N6278HE3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6278HE3/54 requirements.
6.How does Aetrix verify that 1N6278HE3/54 is sourced from the original manufacturer or authorized distributors?
All 1N6278HE3/54 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 1N6278HE3/54 meets industry standards.
7.What is the process for return or replacement of 1N6278HE3/54?
All 1N6278HE3/54 units undergo pre-shipment inspection (PSI). If there is an issue with 1N6278HE3/54, 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 1N6278HE3/54 part is unused and in its original packaging.
Return procedure for 1N6278HE3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N6278HE3/54 Tags
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