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Vishay General Semiconductor - Diodes Division 1N6279AHE3/51
- Part No.:
- 1N6279AHE3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1N6279AHE3/51.pdf
- Description:
- TVS DIODE 18.8VWM 30.6VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:3,286
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Product details
Overview
1N6279AHE3/51 from Vishay General Semiconductor is a uni-directional Transient Voltage Suppressor (TVS) diode designed for primary overvoltage protection of sensitive electronics. It features a 22 V breakdown voltage (VBR = 20.9–23.1 V at 1 mA), 1500 W peak pulse power rating (10/1000 µs), clamping voltage of 30.6 V at 49 A, and operates across –55 °C to +175 °C junction temperature. It is used in automotive power line protection, industrial sensor interface circuits, and DC power rail surge suppression.
For engineers reviewing the 1N6279AHE3/51 datasheet, 1N6279AHE3/51 pinout, 1N6279AHE3/51 application, or 1N6279AHE3/51 equivalent, key selection criteria include its AEC-Q101 qualification, 1.0 µA max reverse leakage at 18.8 V stand-off voltage, glass passivated junction, matte tin-plated leads compliant with J-STD-002, and 15.4 °C/W junction-to-lead thermal resistance.
Technical Context
This TVS diode employs a silicon avalanche junction structure optimized for fast transient response (<1 ns) and low incremental clamping resistance. Its uni-directional polarity uses a cathode band marking and delivers precise voltage clamping during 10/1000 µs surge events up to 49 A peak pulse current.
The device is rated for 1500 W non-repetitive peak pulse power, derates linearly above 25 °C ambient per Fig. 2, and maintains stable clamping performance under repetitive 0.01% duty cycle conditions. Its 1.5KE package supports high-surge reliability with UL 94 V-0 molded epoxy encapsulation and JESD 201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 20.9 V / 23.1 V at 1.0 mA - defines precise avalanche initiation threshold for reliable overvoltage triggering |
| VWM | 18.8 V - maximum continuous working voltage before leakage exceeds 1.0 µA, ensuring no false triggering in normal operation |
| VC @ IPPM | 30.6 V at 49 A - clamped voltage during full 1500 W surge, limiting downstream component stress |
| PPPM | 1500 W - peak pulse power handling capability with 10/1000 µs waveform, enabling robust lightning and ESD protection |
| TJ max | +175 °C - extended junction temperature rating supporting under-hood automotive and industrial environments |
| RθJL | 15.4 °C/W - low junction-to-lead thermal resistance enabling effective heat dissipation into PCB copper without heatsink |
| AEC-Q101 | Qualified - certified for automotive-grade reliability including temperature cycling, HTRB, and surge endurance testing |
Pinout & Package
Package: Case Style 1.5KE - axial-leaded, DO-201AD molded epoxy package with 0.375" (9.5 mm) lead length, UL 94 V-0 rated, matte tin-plated leads solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to protected circuit ground or low-side reference; enables bidirectional surge shunting when paired with complementary devices |
| Cathode (banded end) | Current exit point during forward conduction; avalanche terminal during reverse surge | Connected to protected line (e.g., 24 V rail); absorbs transients by clamping to VC when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated chip junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| 1500 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 Level 4 (4 kV) surge immunity without external series impedance |
| AEC-Q101 qualified | Validated for automotive powertrain and body electronics applications requiring zero field failure risk |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a/5a), improving system-level robustness |
| JESD 201 Class 2 whisker resistance | Prevents tin whisker growth under high-temperature/humidity bias, critical for long-life industrial deployments |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface |
|---|---|
Use Scenario: Suppressing load dump and alternator ripple on 12 V/24 V vehicle battery rails. IC Role / Device Role / Timing Role: Primary clamping device placed between power input and DC-DC converter input stage. Use Value: Limits transient voltage to ≤30.6 V during 100 A/100 ms load dump events, preventing regulator latch-up or MOSFET gate oxide damage. |
Use Scenario: Protecting 4–20 mA current loop transmitters against induced surges from nearby motor drives. IC Role / Device Role / Timing Role: Standoff protector mounted across loop terminals, upstream of precision op-amp input stage. Use Value: Clamps 1 kV/0.5 A surge (IEC 61000-4-5) within 1 ns while maintaining <1.0 µA leakage at 18.8 V, preserving loop accuracy. |
| Telecom DC Feeder Protection | Consumer Power Adapter Input Stage |
Use Scenario: Safeguarding PoE-powered equipment front-end rectifiers from lightning-induced surges on outdoor Ethernet cables. IC Role / Device Role / Timing Role: First-line TVS on DC input rail, coordinated with gas discharge tube (GDT) for staged protection. Use Value: Absorbs 1500 W energy (10/1000 µs) without degradation, enabling GDT to handle bulk energy while 1N6279AHE3/51 controls let-through voltage. |
Use Scenario: Overvoltage protection on AC/DC adapter secondary-side 5 V/12 V outputs feeding USB peripherals or smart home controllers. IC Role / Device Role / Timing Role: Secondary-side clamp placed after output filter capacitor, before connector pins. Use Value: Prevents >30.6 V from reaching downstream USB PD controllers during hot-plug or capacitor discharge transients, avoiding latch-up or reset faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ22A | DO-214AA package (SMB), 22 V VBR, 600 W PPPM, 33.2 V VC @ 18.1 A | Lower power rating; suited for space-constrained PCBs where 1500 W is not required | Select SMBJ22A only if board layout restricts axial-leaded components and surge threat level is ≤600 W (e.g., consumer USB ports) |
| 1.5KE22A-E3/54 | Same electrical specs and 1.5KE package, but commercial-grade (non-AEC-Q101), RoHS-compliant E3 suffix only | Lacks automotive qualification; suitable for industrial/commercial systems without AEC requirements | Choose 1.5KE22A-E3/54 for cost-sensitive non-automotive designs where AEC-Q101 is not mandated |
Compared with SMBJ22A and 1.5KE22A-E3/54, the 1N6279AHE3/51 uniquely combines AEC-Q101 qualification, 1500 W surge capacity, and axial-leaded 1.5KE packaging-making it the only option for automotive under-hood power rail protection requiring both high-energy handling and automotive reliability certification.
Availability
1N6279AHE3/51 is available at Aetrix Electronics and suitable for automotive power distribution modules, industrial PLC I/O protection, and telecom DC feeder systems requiring stable component supply across multi-year production cycles.
Supply support for 1N6279AHE3/51 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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The 1N6279AHE3/51 belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-energy transient suppression in harsh environments where AEC-Q101 compliance and repeatable clamping performance are mandatory.
FAQ
What is the breakdown voltage tolerance of the 1N6279AHE3/51?
The 1N6279AHE3/51 has a specified breakdown voltage range of 20.9 V to 23.1 V at 1.0 mA test current, representing ±5% tolerance around the nominal 22 V rating. This tight VBR window ensures consistent clamping behavior across production lots and supports predictable system-level surge margin design without over-engineering downstream components.
Is the 1N6279AHE3/51 suitable for bi-directional transient protection?
No, the 1N6279AHE3/51 is a uni-directional TVS diode, indicated by the "A" suffix and cathode band marking. For bi-directional protection, Vishay offers the 1N6279CA variant (with "CA" suffix), which provides symmetrical clamping in both polarities. Using the 1N6279AHE3/51 in reverse-biased configurations risks permanent junction damage due to lack of reverse avalanche capability.
What does the "HE3/51" suffix indicate in 1N6279AHE3/51?
The "HE3" denotes RoHS-compliant construction with AEC-Q101 qualification and JESD 201 Class 2 whisker resistance; "/51" specifies packaging in 13" diameter paper tape and reel with 500 units per reel. This distinguishes it from commercial-grade variants like 1.5KE22A-E3/54 (no AEC-Q101) and ensures traceability for automotive production audits.
How does the 1N6279AHE3/51 perform under elevated ambient temperatures?
The 1N6279AHE3/51 derates linearly above 25 °C ambient per Figure 2 in Vishay document 88301: at 85 °C ambient, its peak pulse power drops to ~1100 W, and at 125 °C, to ~750 W. Its +175 °C max junction temperature allows continued operation in engine bay or industrial control cabinet environments when mounted on adequate copper area.
Can the 1N6279AHE3/51 be used in parallel for higher surge current handling?
Yes, multiple 1N6279AHE3/51 devices can be paralleled to increase total IPPM, but only with matched VBR (within ±1 V) and symmetric PCB layout (equal trace inductance/resistance). Unmatched units will share current unevenly, causing premature failure of the lowest-VBR device. Vishay recommends using a single higher-rated device (e.g., 1N6280A) instead of parallel 1N6279AHE3/51 unless layout constraints require it.
1N6279AHE3/51 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):
- 18.8V
- Voltage - Breakdown (Min):
- 20.9V
- Voltage - Clamping (Max) @ Ipp:
- 30.6V
- Current - Peak Pulse (10/1000µs):
- 49A
- 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
1N6279AHE3/51 FAQ
1.How can I place an order for 1N6279AHE3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6279AHE3/51 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 1N6279AHE3/51 reliable?
The price and inventory of 1N6279AHE3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6279AHE3/51 is usually 5 days.
3.What payment methods are accepted for 1N6279AHE3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6279AHE3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6279AHE3/51?
1N6279AHE3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6279AHE3/51 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 1N6279AHE3/51?
For technical support, including 1N6279AHE3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6279AHE3/51 requirements.
6.How does Aetrix verify that 1N6279AHE3/51 is sourced from the original manufacturer or authorized distributors?
All 1N6279AHE3/51 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 1N6279AHE3/51 meets industry standards.
7.What is the process for return or replacement of 1N6279AHE3/51?
All 1N6279AHE3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1N6279AHE3/51, 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 1N6279AHE3/51 part is unused and in its original packaging.
Return procedure for 1N6279AHE3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N6279AHE3/51 Tags
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