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onsemi 1N6279AG
- Part No.:
- 1N6279AG
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
1N6279AG.pdf
- Description:
- TVS DIODE 18.8VWM 30.6VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:2,374
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Product details
Overview
1N6279AG from ON Semiconductor is a unidirectional 1500 W Mosorb transient voltage suppressor (TVS) diode in axial lead Surmetic package, designed for parallel clamping protection of sensitive electronics. It features a 18.8 V working peak reverse voltage (VRWM), 22 V breakdown voltage (VBR) at 1 A test current, 30.6 V clamping voltage (VC) at 49 A peak pulse current, and <1 ns response time - ideal for safeguarding power supplies and industrial control interfaces against ESD and lightning-induced surges.
For engineers reviewing the 1N6279AG datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin over operating voltage, VC vs. device withstand rating, UL 497B certification for isolated loop protection, and axial lead mechanical robustness for through-hole mounting in high-reliability industrial systems.
Technical Context
The 1N6279AG operates as a silicon avalanche diode with unidirectional polarity, activated only during reverse overvoltage events above its specified VBR. Its low dynamic impedance ensures stable clamping performance under 1 ms 1500 W transients, while the thermally optimized CASE 41A package enables 20 °C/W junction-to-lead thermal resistance and 5.0 W steady-state dissipation at 75 °C lead temperature.
It meets Class 3 ESD immunity (>16 kV HBM), complies with UL 497B for isolated loop circuit protection, and exhibits <5 µA leakage current above 10 V - enabling reliable operation in low-power standby circuits without compromising system quiescent current budgets.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 18.8 V - maximum continuous reverse operating voltage before clamping begins; must exceed circuit's peak DC/AC voltage to avoid false triggering |
| VBR @ IT=1 A | 22 V (min–max: 20.9–23.1 V) - precise avalanche onset threshold defining protection activation point |
| VC @ IPP=49 A | 30.6 V - maximum clamped voltage seen by protected load during full-rated 1500 W surge |
| PPK | 1500 W @ 1 ms - peak single-pulse energy handling capability per JEDEC standard waveform |
| Response Time | <1 ns - enables suppression before fast-rising transients damage downstream CMOS/MOS ICs |
| Leakage Current | <5 µA @ VRWM - negligible standby power loss in battery-backed or energy-sensitive applications |
| UL Recognition | UL 497B QVGQ2 - certified for use in telecom and industrial isolated loop protection circuits |
Pinout & Package
Package: Axial lead, CASE 41A Surmetic plastic housing (Pb-free), cathode indicated by band. Dimensions: A = 8.5–9.5 mm length, B = 4.8–5.3 mm diameter, D = 0.96–1.06 mm lead diameter, K = 25.4 mm minimum lead length.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Ground reference in unidirectional clamp | Connected to system ground or low-side return path; carries surge current to earth during clamping |
| Cathode | Reverse-biased clamping node / Input protection point | Connected to protected line (e.g., +12 V rail); enters avalanche conduction when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse rating | Enables robust protection against IEC 61000-4-5 Level 4 (4 kV/2 Ω) surges without derating in typical PCB layouts |
| UL 497B certification | Validates suitability for safety-critical isolated loop interfaces in medical and telecom equipment |
| ESD Class 3 (>16 kV HBM) | Meets stringent electrostatic discharge immunity requirements for field-deployed industrial controls |
| Low zener impedance | Maintains tight VC tolerance across production lot and temperature range, ensuring predictable clamping margin |
| Pb-free Surmetic package | RoHS-compliant axial construction with corrosion-resistant leads and 260 °C solderability |
Applications
| Industrial Power Supply Protection | Medical Equipment Input Stage |
|---|---|
Use Scenario: 24 V DC input rail in programmable logic controller (PLC) power module exposed to inductive switching transients and lightning-coupled surges. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed across input terminals to clamp transients before they reach upstream rectifier and regulator ICs. Use Value: 30.6 V clamping voltage ensures protected 24 V rail stays below 33 V absolute maximum rating of downstream LDOs and microcontrollers. | Use Scenario: Isolated sensor interface in patient-monitoring device where analog front-end connects to external probes via long cables. IC Role / Device Role / Timing Role: UL 497B-certified transient suppressor on isolated side of signal conditioning circuit to prevent surge propagation into patient-connected circuitry. Use Value: Compliance with UL 497B validates safe operation in medically isolated loops, eliminating need for additional barrier components. |
| Telecom Line Interface | Process Control Signal Conditioning |
Use Scenario: RS-485 data line in outdoor base station exposed to induced surges from nearby lightning strikes. IC Role / Device Role / Timing Role: Fast-response TVS diode mounted directly at connector to shunt common-mode transients before entering transceiver IC. Use Value: Sub-1 ns response time minimizes overshoot, preserving signal integrity and preventing receiver latch-up during 1 kV/500 Ω surge events. | Use Scenario: 4–20 mA current loop input in factory automation I/O module subjected to relay coil kickback and ground bounce. IC Role / Device Role / Timing Role: Low-leakage (≤5 µA) TVS diode across loop terminals to absorb repetitive low-energy transients without affecting loop calibration. Use Value: Ultra-low leakage preserves milliamp-level accuracy over temperature and time, avoiding zero-point drift in precision analog inputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1.5KE22AG | Same VRWM (18.8 V), identical package and surge rating; minor VBR tolerance difference (20.9–23.1 V vs. 20.9–23.1 V - same spec) | No functional difference; both meet UL 497B and ESD Class 3 | Select 1.5KE22AG if preferred part status or tape-and-reel packaging is required |
| SMBJ22A | Surface-mount SMB package; lower PPK (600 W); tighter VBR tolerance (20.9–22.9 V); same VRWM | Not suitable for high-energy surges requiring 1500 W; requires PCB rework for SMT layout | Choose SMBJ22A only for space-constrained designs where 600 W surge margin suffices and SMT assembly is mandatory |
Compared with 1N6279AG, 1.5KE22AG offers identical electrical and safety performance in the same axial package, while SMBJ22A trades surge capacity and through-hole compatibility for board space savings - making 1N6279AG optimal for legacy industrial systems needing proven 1500 W clamping in robust axial form.
Availability
1N6279AG is available at Aetrix Electronics and suitable for industrial power supplies, medical equipment input stages, telecom line interfaces, process control signal conditioning, and numerical control systems requiring stable component supply with full UL 497B compliance and long-term obsolescence management.
Supply support for 1N6279AG 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 is a global semiconductor manufacturer specializing in power management, analog, sensor, and discrete devices for automotive, industrial, and communications markets.
The 1N6279AG belongs to the 1N6267A Series Mosorb TVS family, engineered specifically for high-energy transient suppression in harsh industrial environments where reliability, UL certification, and axial mechanical ruggedness are critical.
FAQ
What is the clamping voltage of the 1N6279AG and how is it measured?
The 1N6279AG has a maximum clamping voltage (VC) of 30.6 V, measured at a peak pulse current (IPP) of 49 A using the standardized 1 ms exponential waveform defined in Figure 5 of the datasheet. This value represents the highest voltage the 1N6279AG allows across its terminals during a full-rated 1500 W transient event, ensuring downstream components remain within safe operating limits.
Is the 1N6279AG RoHS compliant and what does the 'G' suffix indicate?
Yes, the 1N6279AG is RoHS compliant. The 'G' suffix explicitly denotes a Pb-free Surmetic axial lead package, verified per ON Semiconductor's Pb-Free Packaging Standard. This includes lead-free molding compound, termination finish, and adherence to J-STD-609 Category 1 moisture sensitivity level (MSL-1), with no exemptions required for lead content.
Does the 1N6279AG require a series impedance for proper operation?
Yes, the 1N6279AG requires external series impedance (e.g., fuse, resistor, or ferrite bead) between the protected line and the TVS anode to limit fault current during sustained overvoltage. Without it, continuous conduction above VBR could cause thermal runaway. The 1N6279AG itself provides no internal current limiting - its design assumes proper coordination with upstream protection elements per application note guidance.
Can the 1N6279AG be used in bidirectional protection configurations?
No, the 1N6279AG is strictly unidirectional and must not be used for bidirectional surge suppression. Its cathode-band polarity defines fixed anode-to-cathode orientation; reverse connection will forward-bias the device at ~0.7 V and cause immediate failure. For bidirectional protection, use a dedicated symmetric TVS like SMAJ22CA or pair two 1N6279AG devices in series opposition - but neither approach is validated for the 1N6279AG.
What is the thermal resistance specification for the 1N6279AG and how does it affect layout?
The 1N6279AG has a junction-to-lead thermal resistance (RJL) of 20 °C/W, measured with 3/8 inch lead length at TL = 25 °C. This means each watt of sustained power dissipates a 20 °C temperature rise from junction to lead. To maintain reliability, PCB layout must ensure adequate copper pour on both leads and avoid excessive trace length - otherwise, thermal derating reduces steady-state power capability below the rated 5.0 W at 75 °C.
1N6279AG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-201AD, Axial
- Series:
- Mosorb™
- Packaging:
- Bulk
- Product Status:
- Active
- 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
1N6279AG FAQ
1.How can I place an order for 1N6279AG through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6279AG 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 1N6279AG reliable?
The price and inventory of 1N6279AG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6279AG is usually 5 days.
3.What payment methods are accepted for 1N6279AG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6279AG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6279AG?
1N6279AG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6279AG 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 1N6279AG?
For technical support, including 1N6279AG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6279AG requirements.
6.How does Aetrix verify that 1N6279AG is sourced from the original manufacturer or authorized distributors?
All 1N6279AG 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 1N6279AG meets industry standards.
7.What is the process for return or replacement of 1N6279AG?
All 1N6279AG units undergo pre-shipment inspection (PSI). If there is an issue with 1N6279AG, 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 1N6279AG part is unused and in its original packaging.
Return procedure for 1N6279AG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N6279AG Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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