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Vishay General Semiconductor - Diodes Division 1N6278A-E3/73
- Part No.:
- 1N6278A-E3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1N6278A-E3/73.pdf
- Description:
- TVS DIODE 17.1VWM 27.7VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:6,123
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Product details
Overview
1N6278A-E3/73 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 19.0–21.0 V breakdown voltage (VBR), 17.1 V maximum standoff voltage (VWM), 1500 W peak pulse power (10/1000 µs), 27.7 V clamping voltage at 54.2 A, and operates across –55 °C to +175 °C junction temperature range - deployed in automotive power supply inputs and industrial sensor interface protection.
For engineers reviewing the 1N6278A-E3/73 datasheet, 1N6278A-E3/73 pinout, 1N6278A-E3/73 application, or 1N6278A-E3/73 equivalent, this page delivers verified electrical parameters, JEDEC 1.5KE package details, thermal resistance (RθJA = 75 °C/W), polarity marking convention, and direct alternative options for ESD and lightning surge protection design.
Technical Context
This unidirectional TVS diode uses a glass-passivated silicon junction optimized for fast transient response (<1 ns) and low incremental surge resistance. Its clamping action activates within nanoseconds of overvoltage onset, limiting voltage to ≤27.7 V at 54.2 A peak pulse current under standardized 10/1000 µs waveform conditions.
It supports repetitive surge events at 0.01% duty cycle and complies with JESD 22-B106 solderability (275 °C, 10 s). The device exhibits a positive temperature coefficient of VBR (+0.090 %/°C) and is rated for 200 A non-repetitive forward surge (8.3 ms half-sine).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 19.0 V / 21.0 V - ensures reliable conduction onset above normal operating voltage while avoiding false triggering |
| VWM | 17.1 V - maximum continuous reverse working voltage before leakage exceeds 1 µA |
| VC @ IPPM | 27.7 V at 54.2 A - clamped voltage level protecting downstream ICs from destructive overvoltage |
| PPPM | 1500 W - peak pulse power handling for 10/1000 µs transients per IEEE C62.35 |
| IFSM | 200 A - surge current rating for 8.3 ms half-sine wave, critical for load-dump immunity |
| TJ range | –55 °C to +175 °C - enables deployment in under-hood automotive and industrial environments |
| RθJA | 75 °C/W - defines thermal derating behavior on PCB without heatsink |
Pinout & Package
Package: JEDEC DO-201AD (Case Style 1.5KE), axial-leaded, molded epoxy body with matte tin-plated leads compliant to J-STD-002 and JESD 22-B102. Cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference | Connected to lower-potential side (e.g., GND or return path) in unidirectional clamp configuration |
| Cathode | Clamping node / Surge current sink | Connected to protected line (e.g., 12 V rail); conducts during overvoltage to shunt energy to ground |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable VBR tolerance and long-term reliability under thermal cycling and humidity stress |
| 1500 W pulse power (10/1000 µs) | Supports IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly laid out with low-inductance grounding |
| Fast response time (<1 ns) | Clamps transients before sensitive logic or analog circuitry sustains damage |
| AEC-Q101 qualified variants available | Meets automotive-grade qualification requirements for temperature cycling, HTRB, and surge endurance |
| RoHS-compliant (E3 suffix) | Meets JESD 201 Class 1A whisker resistance and UL 94 V-0 flammability for safety-critical assemblies |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Clamp |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and alternator ripple transients. IC Role / Device Role: Primary overvoltage clamp placed between input rail and ground, absorbing up to 1500 W surges. Use Value: Limits rail voltage to ≤27.7 V during 54.2 A surge, preventing damage to LDOs, microcontrollers, and CAN transceivers. | Use Scenario: Shielding 4–20 mA current-loop sensor outputs from ESD and induced lightning surges. IC Role / Device Role: Unidirectional shunt protector on signal line referenced to system ground. Use Value: Clamps transients before they reach precision op-amps or ADC front-ends, preserving measurement integrity. |
| Consumer Power Adapter Output | Telecom DC Feeder Protection |
Use Scenario: Safeguarding USB-C PD and AC/DC adapter secondary-side outputs from output short-circuit recovery spikes. IC Role / Device Role: Secondary-side TVS on regulated DC output, coordinated with primary OVP. Use Value: Prevents latch-up or gate oxide rupture in connected devices during abnormal startup or fault recovery. | Use Scenario: Protecting PoE-powered equipment (e.g., IP cameras) from longitudinal surges on twisted-pair feeder lines. IC Role / Device Role: Line-to-ground clamp on DC input, used with common-mode chokes and differential TVS. Use Value: Maintains <17.1 V standoff during normal operation while clamping >200 V transients to safe levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20A | DO-214AA package (smaller footprint), 20 V VWM, 32.4 V VC @ 46.7 A, 600 W PPPM | Limited to lower-energy transients; unsuitable for full IEC 61000-4-5 Level 4 without parallel staging | Select when board space is constrained and surge threat level is ≤1 kV; verify layout inductance does not degrade clamping performance. |
| 1.5KE20A | Same 1.5KE package, identical VBR/VWM/VC specs, but base P/N without E3/73 tape-and-reel packaging code | No functional difference; differs only in packaging format and traceability compliance (E3 = RoHS, 73 = reel size) | Use 1.5KE20A for manual prototyping or non-RoHS legacy builds; 1N6278A-E3/73 required for automated SMT assembly with RoHS and JESD 201 compliance. |
Compared with SMBJ20A, the 1N6278A-E3/73 delivers 2.5× higher pulse power and superior thermal robustness in high-energy surge environments; compared with 1.5KE20A, it adds RoHS compliance, whisker-resistant plating, and standardized 73-reel logistics - making it the preferred choice for production-grade automotive and industrial designs.
Availability
1N6278A-E3/73 is available at Aetrix Electronics and suitable for automotive power input protection, industrial sensor interface clamping, and telecom DC feeder surge suppression requiring stable component supply, full RoHS compliance, and AEC-Q101-qualified alternatives.
Supply support for 1N6278A-E3/73 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, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and automotive-grade qualification.
The 1N6278A-E3/73 belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-energy transient suppression in harsh environments where fast response, stable clamping, and long-term parametric stability are mandatory.
FAQ
What is the breakdown voltage tolerance of the 1N6278A-E3/73?
The 1N6278A-E3/73 has a specified breakdown voltage (VBR) range of 19.0 V to 21.0 V at 1.0 mA test current, representing ±5.26% tolerance about the nominal 20 V rating. This tight tolerance ensures predictable clamping onset across production lots and temperature extremes, critical for coordinating with downstream overvoltage protection thresholds in power management ICs.
Is the 1N6278A-E3/73 suitable for bidirectional transient suppression?
No, the 1N6278A-E3/73 is a unidirectional TVS diode. Its cathode band marks the terminal that must be connected to the protected line, with anode tied to ground. For bidirectional protection, Vishay offers the 1N6278CA variant (or 1.5KE20CA), which provides symmetrical clamping in both polarities and lacks polarity marking.
What is the maximum clamping voltage of the 1N6278A-E3/73 under surge conditions?
The 1N6278A-E3/73 clamps to a maximum of 27.7 V when subjected to its rated peak pulse current of 54.2 A under the standard 10/1000 µs waveform. This value is measured as VC and represents the upper limit of voltage seen by protected circuitry during worst-case surge events.
Does the 1N6278A-E3/73 meet automotive qualification standards?
The base 1N6278A-E3/73 is RoHS-compliant and commercial-grade. However, Vishay offers the AEC-Q101-qualified variant as 1N6278AHE3_B (or 1.5KE20AHE3_B), which undergoes extended stress testing including temperature cycling, HTRB, and surge endurance per AEC-Q101 Rev D. Always verify part number suffix for qualification status.
How does the thermal resistance of the 1N6278A-E3/73 affect PCB layout?
The 1N6278A-E3/73 has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W. To maintain TJ ≤175 °C under sustained 6.5 W dissipation, PCB copper area must provide adequate heat spreading - minimum 1 in² (6.5 cm²) of 2-oz copper connected to both leads, with thermal vias to inner layers recommended for high-reliability applications.
1N6278A-E3/73 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- TransZorb®
- Packaging:
- Tape & Box (TB)
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 1.5KE
1N6278A-E3/73 FAQ
1.How can I place an order for 1N6278A-E3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6278A-E3/73 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 1N6278A-E3/73 reliable?
The price and inventory of 1N6278A-E3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6278A-E3/73 is usually 5 days.
3.What payment methods are accepted for 1N6278A-E3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6278A-E3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6278A-E3/73?
1N6278A-E3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6278A-E3/73 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 1N6278A-E3/73?
For technical support, including 1N6278A-E3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6278A-E3/73 requirements.
6.How does Aetrix verify that 1N6278A-E3/73 is sourced from the original manufacturer or authorized distributors?
All 1N6278A-E3/73 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 1N6278A-E3/73 meets industry standards.
7.What is the process for return or replacement of 1N6278A-E3/73?
All 1N6278A-E3/73 units undergo pre-shipment inspection (PSI). If there is an issue with 1N6278A-E3/73, 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 1N6278A-E3/73 part is unused and in its original packaging.
Return procedure for 1N6278A-E3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N6278A-E3/73 Tags
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