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onsemi 1N6279A
- Part No.:
- 1N6279A
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
1N6279A.pdf
- Description:
- TVS DIODE 18.8VWM 30.6VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:2,648
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Product details
Overview
1N6279A from ON Semiconductor is a unidirectional 1500 W transient voltage suppressor (TVS) diode designed for parallel clamping protection of sensitive electronics against high-energy surges. It features a working peak reverse voltage (VRWM) of 18.8 V, clamping voltage (VC) of 30.6 V at 49 A peak pulse current (IPP), and sub-1 ns response time. It is used in industrial power supplies to safeguard 24 V DC rails from lightning-induced transients and ESD events.
For engineers reviewing the 1N6279A datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to system operating voltage, peak pulse current handling under 1 ms waveform, UL 497B certification for isolated loop protection, and axial leaded Surmetic package compatibility with through-hole PCB layouts.
Technical Context
The 1N6279A operates as a silicon avalanche diode configured in unidirectional mode, leveraging controlled Zener breakdown to clamp transient overvoltages above its VRWM. Its low dynamic impedance ensures stable clamping across varying surge magnitudes, while its thermal resistance (RJL = 20 °C/W) supports reliable power dissipation during repetitive pulses when mounted with 3/8″ lead length.
It complies with UL 497B for isolated loop circuit protection and meets Class 3 ESD immunity (>16 kV HBM). The device exhibits a temperature coefficient of breakdown voltage of 0.092 %/°C, enabling predictable voltage drift over its −65 °C to +175 °C operating range without requiring external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 18.8 V - Maximum continuous reverse operating voltage before clamping begins; selected to match 24 V nominal DC systems with safety margin. |
| VC @ IPP | 30.6 V @ 49 A - Clamped voltage during 1 ms 1500 W surge; ensures downstream ICs see <31 V during worst-case transient. |
| Peak Pulse Power | 1500 W @ 1 ms - Withstands IEC 61000-4-5 Level 4 surges (4 kV line-to-line) without degradation when properly mounted. |
| Response Time | <1 ns - Enables suppression before transient energy couples into protected circuitry; critical for MOSFET gate and microcontroller I/O protection. |
| Leakage Current | <5 µA @ 18.8 V - Negligible standby power loss and no measurable loading on 24 V supply under normal operation. |
| Breakdown Voltage | 20.9–23.1 V @ 1 mA - Tight VBR tolerance ensures consistent turn-on behavior across production lots and temperature. |
| Package | Case 41A axial lead - Void-free thermoset plastic housing rated for 230 °C soldering (10 s, 1/16″ from case); enables manual or wave soldering. |
Pinout & Package
1N6279A uses an axial-leaded, polarity-banded package (Case 41A). Cathode is marked by a band; anode is unmarked lead. Leads are tin-plated, Pb-free, and solderable per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node in clamping configuration; defines return path for surge current. |
| Cathode | High-side clamping terminal | Connected to protected line (e.g., 24 V rail); conducts avalanche current when voltage exceeds VRWM. |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition | Qualified for isolated loop protector category - satisfies regulatory requirements for telecom and industrial fieldbus interfaces without additional certification effort. |
| ESD Rating | Class 3 (>16 kV HBM) - Eliminates need for secondary ESD protection on board-level I/O lines interfacing with human-accessible ports. |
| Surge Robustness | 1500 W non-repetitive peak power - Handles multiple 1 ms surges per minute per JEDEC test conditions, supporting long-term reliability in harsh environments. |
| Low Clamping Ratio | VC / VBR(min) = 30.6 / 20.9 ≈ 1.46 - Minimizes overvoltage stress on protected components compared to higher-ratio TVS devices. |
Applications
| Industrial PLC I/O Protection | 24 V DC Power Supply Input |
|---|---|
Use Scenario: Protecting digital input modules in programmable logic controllers from induced surges on 24 V sensor wiring. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between signal line and chassis ground. Use Value: Limits transient voltage to ≤30.6 V, preventing latch-up or damage to 24 V-tolerant Schmitt-trigger inputs and optocoupler drivers. |
Use Scenario: Safeguarding switching regulator front-end against line surges in DIN-rail mounted power supplies. IC Role / Device Role / Timing Role: Primary overvoltage clamp on DC input bus prior to bulk capacitor and controller IC. Use Value: Absorbs up to 1500 W for 1 ms without failure, maintaining system uptime during lightning-induced grid disturbances. |
| Medical Equipment Signal Lines | Process Control Analog Inputs |
Use Scenario: Shielding isolated analog sensor interfaces (e.g., pressure transducers) in diagnostic imaging equipment. IC Role / Device Role / Timing Role: Low-leakage TVS on shielded twisted-pair outputs referenced to isolated ground. Use Value: Adds <5 µA leakage at 18.8 V, preserving µV-level signal integrity while meeting IEC 60601-1 creepage/clearance requirements. |
Use Scenario: Protecting 4–20 mA current loop receivers in hazardous-area process controllers. IC Role / Device Role / Timing Role: UL 497B-certified TVS on loop-powered input terminals to meet intrinsic safety interface standards. Use Value: Validated for isolated loop protection per UL 497B, reducing compliance validation burden for SIL2-rated systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24A | Surface-mount SMC package; 24 V VRWM; 38.9 V VC @ 38.8 A; lower peak power (600 W). | Designed for automated assembly; unsuitable for high-energy surges exceeding 600 W. | Select when board space is constrained and surge threat level is limited to IEC 61000-4-2/4-4. |
| 1.5KE22A | Same axial Case 41A package; identical electrical specs (VRWM = 18.8 V, VC = 30.6 V); ON Semiconductor alternate part number. | No functional or mechanical difference; dual-marking variant per JEDEC/ON naming convention. | Direct form-fit-function replacement; interchangeable in legacy BOMs referencing either designation. |
Compared with 1N6279A, SMBJ24A offers SMT compatibility but sacrifices 60% peak surge capacity, while 1.5KE22A provides identical performance in the same axial package-making it a seamless drop-in alternative for sourcing continuity.
Availability
1N6279A is available at Aetrix Electronics and suitable for industrial PLCs, 24 V DC power supplies, medical sensor interfaces, and process control systems requiring stable component supply and long-term obsolescence management.
Supply support for 1N6279A 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
ON Semiconductor (now onsemi) is a global semiconductor supplier specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The 1N6279A belongs to the Mosorb™ 1500 W TVS family, engineered specifically for robust, cost-effective overvoltage protection in high-reliability industrial and communications infrastructure where axial-leaded reliability and UL certification are mandatory.
FAQ
What is the maximum working peak reverse voltage (VRWM) of the 1N6279A?
The 1N6279A has a VRWM of 18.8 V, meaning it remains in high-impedance blocking state up to this DC or continuous peak reverse voltage. This value is selected to protect 24 V systems while providing sufficient margin above nominal rail voltage to avoid false triggering during normal operation or ripple.
How does the clamping voltage (VC) of the 1N6279A compare to its breakdown voltage (VBR)?
The 1N6279A clamps at 30.6 V when subjected to its rated peak pulse current of 49 A, while its breakdown voltage VBR ranges from 20.9 V to 23.1 V at 1 mA test current. This 30–33% clamping ratio reflects its low dynamic impedance and ensures effective voltage limiting without excessive overshoot during fast transients.
Is the 1N6279A certified for UL 497B, and what does that mean for my design?
Yes, the 1N6279A carries UL 497B recognition for isolated loop circuit protection. This certification validates its performance in telecom and industrial data line protection, covering tests such as strike voltage breakdown, endurance conditioning, and dielectric withstand-reducing the need for additional system-level safety testing in compliant designs.
Can the 1N6279A be used in bidirectional transient protection applications?
No-the 1N6279A is strictly unidirectional. For bidirectional protection, ON Semiconductor offers the 1.5KE22CA (JEDEC-compliant counterpart), which provides symmetrical clamping for AC-coupled or floating signal lines. Using 1N6279A in reverse-biased AC applications risks permanent failure due to lack of reverse conduction capability.
What is the thermal resistance and steady-state power rating of the 1N6279A?
The 1N6279A has a junction-to-lead thermal resistance (RJL) of 20 °C/W and a steady-state power dissipation (PD) of 5.0 W at TL ≤ 75 °C with 3/8″ lead length. Derating is required above 75 °C at 20 mW/°C, making it suitable for ambient temperatures up to +75 °C in well-ventilated through-hole layouts.
1N6279A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-201AD, Axial
- Series:
- Mosorb™
- 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):
- -
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
1N6279A FAQ
1.How can I place an order for 1N6279A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6279A 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 1N6279A reliable?
The price and inventory of 1N6279A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6279A is usually 5 days.
3.What payment methods are accepted for 1N6279A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6279A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6279A?
1N6279A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6279A 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 1N6279A?
For technical support, including 1N6279A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6279A requirements.
6.How does Aetrix verify that 1N6279A is sourced from the original manufacturer or authorized distributors?
All 1N6279A 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 1N6279A meets industry standards.
7.What is the process for return or replacement of 1N6279A?
All 1N6279A units undergo pre-shipment inspection (PSI). If there is an issue with 1N6279A, 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 1N6279A part is unused and in its original packaging.
Return procedure for 1N6279A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N6279A Tags
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