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Vishay General Semiconductor - Diodes Division 1N6278AHE3_B/C
- Part No.:
- 1N6278AHE3_B/C
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1N6278AHE3_B/C.pdf
- Description:
- 1.5KW,20V 5%,UNIDIR,AXIAL TVS
- Quantity:
- Payment:
- Shipping:
Inventory:2,194
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Product details
Overview
1N6278AHE3_B/C from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode designed for primary-side overvoltage protection in DC power rails and signal lines. It features a 20 V breakdown voltage (VBR = 19.0–21.0 V at 1.0 mA), 17.1 V maximum working voltage (VWM), 27.7 V clamping voltage (VC) 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 - deployed in automotive power supplies and industrial sensor interfaces.
For engineers reviewing the 1N6278AHE3_B/C datasheet, 1N6278AHE3_B/C pinout, 1N6278AHE3_B/C application, or 1N6278AHE3_B/C equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 75 °C/W), JEDEC 1.5KE package dimensions, and real-world clamping behavior under transient surge conditions.
Technical Context
This unidirectional TVS diode uses a glass-passivated silicon junction to achieve sub-nanosecond response time (<1 ns) and low incremental surge resistance. Its clamping action begins at 19.0 V (min VBR) and limits transients to ≤27.7 V at 54.2 A (10/1000 µs), with a temperature coefficient of +0.090 %/°C ensuring stable breakdown across operating range.
The device supports 200 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine) and exhibits 3.5 V max forward voltage at 100 A. Its 1.5KE molded epoxy package meets UL 94 V-0 flammability and JESD 201 Class 2 whisker resistance (HE3 suffix), confirming suitability for high-reliability automotive PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 19.0 V / 21.0 V at 1.0 mA - defines precise voltage threshold where clamping initiates under controlled test conditions |
| VWM | 17.1 V - maximum continuous reverse voltage before leakage exceeds 1.0 µA, sets safe operating margin below VBR |
| VC @ IPPM | 27.7 V at 54.2 A (10/1000 µs) - actual worst-case voltage seen by protected circuit during full-rated transient |
| PPPM | 1500 W - peak transient energy absorption capability without failure, validated per R.E.A. 10/1000 µs waveform |
| IFSM | 200 A (8.3 ms half-sine) - surge current handling for inductive switch-off events in motor drivers or solenoid controls |
| TJ range | –55 °C to +175 °C - enables deployment in under-hood automotive ECUs and industrial power converters without derating |
| RθJA | 75 °C/W - thermal resistance from junction to ambient, informs heatsinking requirements for sustained power dissipation |
Pinout & Package
1N6278AHE3_B/C is housed in the industry-standard JEDEC 1.5KE axial-leaded package: molded epoxy body (UL 94 V-0), matte tin-plated leads, 0.375" (9.5 mm) lead length, 0.210" (5.3 mm) body diameter. Cathode identified by color band on case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or low-impedance return plane; completes clamping loop during negative transients |
| Cathode | Protected line connection / clamping node | Connected to line being protected (e.g., 12 V rail); conducts when VAK > VBR to shunt surge to ground |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable VBR tolerance (±5 %) and long-term reliability under thermal cycling and humidity stress |
| AEC-Q101 qualified (HE3_B variant) | Validated for automotive applications including engine control modules and ADAS power domains |
| 1500 W peak pulse power (10/1000 µs) | Withstands ISO 7637-2 Pulse 1/2a/5a surges without degradation in vehicle battery systems |
| Sub-nanosecond response time | Clamps transients before sensitive ICs (e.g., CAN transceivers, microcontrollers) experience overvoltage damage |
| JESD 201 Class 2 whisker resistance | Prevents tin whisker growth in high-temperature automotive environments, eliminating latent short-circuit risk |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply inputs in engine control units (ECUs) against load dump and inductive switching transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor to clamp surges above 17.1 V. Use Value: Limits transient voltage to ≤27.7 V during 54.2 A pulses, preventing latch-up or gate oxide rupture in downstream PMICs and MCUs. |
Use Scenario: Safeguarding analog outputs (4–20 mA) and digital I/O (RS-485, CAN) of PLC modules exposed to field wiring ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Primary-level TVS on signal line entry points, coordinated with secondary GDT or polymer PTC for multi-stage protection. Use Value: Responds in <1 ns to divert >1 kV transients, preserving signal integrity and enabling compliance with IEC 61000-4-2/4-4/4-5 standards. |
| Consumer Power Adapter Input Stage | Telecom DC Feeder Protection |
Use Scenario: Input-side surge suppression in AC/DC adapters for smart home hubs, guarding against mains-borne transients and capacitor discharge spikes. IC Role / Device Role / Timing Role: First-line TVS connected across bulk capacitor terminals to absorb energy before it reaches primary-side controller ICs. Use Value: Absorbs 1500 W peak pulses without degradation, maintaining adapter reliability across 100,000+ surge cycles per IEC 61000-4-5 Level 4. |
Use Scenario: Overvoltage protection on -48 V DC feeder lines in telecom base stations, mitigating induced surges from nearby lightning strikes on copper distribution cables. IC Role / Device Role / Timing Role: Unidirectional TVS mounted at cabinet entry point, referenced to system ground to clamp positive-going transients only. Use Value: Clamps to 27.7 V while sustaining 200 A surge current, preventing damage to DC/DC converters and backplane supervisors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A-E3/5A | Lower peak power (400 W), SMC package (surface-mount), 20 V VBR, 32.4 V VC @ 12.3 A | Designed for space-constrained PCBs; lacks AEC-Q101 qualification and 1500 W capability | Select when board area is critical and surge threat level is ≤IEC 61000-4-5 Level 2 |
| 1.5KE20AHE3_B/C | Identical electrical specs and AEC-Q101 qualification; same 1.5KE package; differs only in part numbering convention (JEDEC vs. manufacturer prefix) | No functional difference - direct form-fit-function match for 1N6278AHE3_B/C | Preferred for dual-sourcing or inventory flexibility within Vishay's 1.5KE family |
Compared with SMAJ20A-E3/5A, 1N6278AHE3_B/C delivers 3.75× higher surge power handling and automotive qualification; versus 1.5KE20AHE3_B/C, it offers identical performance but distinct ordering code - both share the same die, package, and test flow per Vishay Document 88301.
Availability
1N6278AHE3_B/C is available at Aetrix Electronics and suitable for automotive power management, industrial sensor interface design, and telecom DC feeder protection requiring stable component supply, long-lifecycle support, and AEC-Q101-compliant surge immunity.
Supply support for 1N6278AHE3_B/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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The 1N6278AHE3_B/C belongs to Vishay's TRANSZORB® TVS family, engineered specifically for robust, high-energy transient suppression in harsh environments where fast response and repeatable clamping are mandatory.
FAQ
What is the breakdown voltage tolerance for 1N6278AHE3_B/C?
The 1N6278AHE3_B/C has a specified breakdown voltage range of 19.0 V to 21.0 V at 1.0 mA test current, representing a ±5 % tolerance around the nominal 20 V rating. This tight tolerance ensures consistent clamping onset across production lots and supports reliable overvoltage margin design in safety-critical circuits.
Is 1N6278AHE3_B/C qualified for automotive use?
Yes, the HE3_B/C suffix indicates AEC-Q101 qualification per Vishay Document 88301. The 1N6278AHE3_B/C undergoes stress testing for temperature cycling, humidity bias, mechanical shock, and high-temperature operating life - validating its use in engine control, body electronics, and ADAS power domains.
What is the maximum clamping voltage of 1N6278AHE3_B/C under rated surge conditions?
The 1N6278AHE3_B/C clamps to a maximum of 27.7 V when subjected to its full-rated 54.2 A peak pulse current (10/1000 µs waveform). This value is measured per standard test conditions and defines the upper voltage limit imposed on protected circuitry during worst-case transient events.
Does 1N6278AHE3_B/C have a bidirectional variant?
No - 1N6278AHE3_B/C is strictly unidirectional. Bidirectional variants in the same voltage grade use the "CA" suffix (e.g., 1N6278CAHE3_B/C), but Vishay's documentation confirms 1N6278AHE3_B/C is manufactured and tested only as a unidirectional device with cathode marking.
What package type does 1N6278AHE3_B/C use, and what are its key mechanical features?
The 1N6278AHE3_B/C uses the JEDEC 1.5KE axial-leaded package: 0.210" (5.3 mm) body diameter, 0.375" (9.5 mm) lead length, molded UL 94 V-0 epoxy body, and matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance - optimized for through-hole mounting in high-reliability assemblies.
1N6278AHE3_B/C 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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 17.1V
- Voltage - Breakdown (Min):
- 19V
- Voltage - Clamping (Max) @ Ipp:
- 27.7V
- Current - Peak Pulse (10/1000µs):
- 54.2A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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:
- 1.5KE
1N6278AHE3_B/C FAQ
1.How can I place an order for 1N6278AHE3_B/C through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6278AHE3_B/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 1N6278AHE3_B/C reliable?
The price and inventory of 1N6278AHE3_B/C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6278AHE3_B/C is usually 5 days.
3.What payment methods are accepted for 1N6278AHE3_B/C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6278AHE3_B/C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6278AHE3_B/C?
1N6278AHE3_B/C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6278AHE3_B/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 1N6278AHE3_B/C?
For technical support, including 1N6278AHE3_B/C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6278AHE3_B/C requirements.
6.How does Aetrix verify that 1N6278AHE3_B/C is sourced from the original manufacturer or authorized distributors?
All 1N6278AHE3_B/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 1N6278AHE3_B/C meets industry standards.
7.What is the process for return or replacement of 1N6278AHE3_B/C?
All 1N6278AHE3_B/C units undergo pre-shipment inspection (PSI). If there is an issue with 1N6278AHE3_B/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 1N6278AHE3_B/C part is unused and in its original packaging.
Return procedure for 1N6278AHE3_B/C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N6278AHE3_B/C Tags
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