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onsemi 1N6277ARL4
- Part No.:
- 1N6277ARL4
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
1N6277ARL4.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:9,109
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Product details
Overview
1N6277ARL4 from ON Semiconductor is a unidirectional 1500 W Mosorb transient voltage suppressor (TVS) diode designed for parallel clamping protection of sensitive electronics against high-energy transients. It features a 15.3 V working peak reverse voltage (VRWM), 18 V breakdown voltage (VBR) at 1 mA, and clamps to 25.2 V at 59.5 A peak pulse current (IPP), making it suitable for DC power rail protection in industrial power supplies and communication interfaces.
For engineers reviewing the 1N6277ARL4 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to protected IC's absolute maximum rating, surge current capability under 1 ms 10/1000 µs waveform, UL 497B recognition for isolated loop circuits, and axial leaded Surmetic package compatibility with through-hole PCB assembly.
Technical Context
This device operates as a voltage-clamping avalanche diode, triggered when reverse voltage exceeds its specified VBR of 17.1–18.9 V. Its low dynamic impedance ensures stable clamping during fast transients, with typical response time under 1 ns and ESD robustness exceeding 16 kV per Human Body Model.
The 1N6277ARL4 is rated for 1500 W nonrepetitive peak pulse power at TL ≤ 25°C, derating linearly above 75°C ambient, and supports steady-state dissipation up to 5.0 W at 75°C with 3/8″ lead length. Its thermal resistance junction-to-lead is 20°C/W, enabling effective heat transfer through axial leads into PCB copper.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Peak Reverse Voltage (VRWM) | 15.3 V - Maximum continuous DC or peak AC voltage the device blocks without clamping |
| Breakdown Voltage (VBR) | 17.1–18.9 V @ 1 mA - Voltage at which avalanche conduction begins; defines minimum clamping threshold |
| Clamping Voltage (VC) | 25.2 V @ 59.5 A IPP - Maximum voltage seen by protected circuit during full-rated 1 ms transient |
| Peak Pulse Power (PPK) | 1500 W @ 1 ms - Energy-handling capacity for single transient events per IEC 61000-4-5 waveform |
| Leakage Current (IR) | <5 µA @ VRWM - Minimal parasitic loading on protected line during normal operation |
| Response Time | <1 ns - Enables suppression before most ICs experience latch-up or gate oxide damage |
| UL Recognition | UL 497B QVGV2 - Certified for use in isolated telecom/data line protectors requiring safety agency approval |
Pinout & Package
1N6277ARL4 is housed in an axial-leaded Surmetic plastic package (Case 41A), with cathode identified by a polarity band. Leads are Pb-free, solderable at 230°C for 10 seconds at 1/16″ from case. Mounting position is unrestricted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference node for reverse-biased operation | Connected to ground or lower-potential rail; establishes clamping reference point |
| Cathode | Transient voltage sensing and clamping node | Connected to protected line; conducts avalanche current to anode when VRWM exceeded |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Handles severe lightning-induced surges (IEC 61000-4-5 Level 4) on 24 V DC rails without failure |
| UL 497B recognition | Validates suitability for telecom/data line isolation barriers requiring safety-certified protection components |
| ESD rating >16 kV HBM | Provides system-level ESD immunity without requiring additional discrete ESD devices on board |
| Low zener impedance | Ensures consistent clamping across production lots and temperature range, minimizing voltage overshoot variation |
| Pb-free external finish | Complies with RoHS Directive 2011/65/EU and supports lead-free reflow and wave soldering processes |
Applications
| Industrial Power Supply Protection | RS-485 Communication Interface |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) power module exposed to load dump and inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed across input terminals to clamp positive-going surges before they reach upstream DC-DC converter ICs. Use Value: Limits transient voltage to 25.2 V, well below 36 V absolute maximum rating of common 24 V input buck controllers, preventing catastrophic failure. |
Use Scenario: Protection of RS-485 transceiver pins (A/B) in factory automation nodes connected to long cable runs subject to EFT and surge coupling. IC Role / Device Role / Timing Role: Parallel-connected clamping device referenced to local ground, activated within <1 ns to shunt surge energy away from transceiver ESD structures. Use Value: Maintains signal integrity by limiting differential-mode overvoltage to safe levels while preserving common-mode rejection via matched clamping thresholds. |
| Medical Equipment Power Input | Point-of-Sale Terminal DC Adapter Interface |
Use Scenario: Mains-derived 12 V auxiliary supply input in diagnostic imaging equipment where reliability and safety certification are critical. IC Role / Device Role / Timing Role: Primary overvoltage protector certified to UL 497B, installed upstream of fuse and filtering stage to absorb line-to-ground surges. Use Value: UL recognition enables direct inclusion in safety-critical medical power entry designs without additional system-level validation burden. |
Use Scenario: 12 V DC barrel jack input of retail POS terminal subjected to accidental AC adapter misconnection and hot-plug transients. IC Role / Device Role / Timing Role: Standoff protector mounted adjacent to connector to minimize trace inductance, clamping both fast ESD and slower 10/1000 µs surges. Use Value: 59.5 A IPP rating ensures survival of repeated 1 kV/500 A surge events common in commercial retail environments with poor grounding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A | Surface-mount SMC package; 18 V VBR; 28.8 V VC @ 34.7 A IPP; 600 W PPK | Limited to lower-energy transients; requires PCB real estate optimization for thermal relief | Select when space-constrained designs prioritize SMT assembly over surge margin |
| 1.5KE18A | Same electrical specs and axial package; identical VRWM/VBR/VC/IPP; manufactured under same ON Semi Mosorb process | No functional or mechanical difference; differs only in JEDEC vs. ON Semi part numbering | Direct form-fit-function alternative with identical sourcing and qualification history |
Compared with SMBJ18A, 1N6277ARL4 delivers 2.5× higher surge energy handling in the same axial footprint; compared with 1.5KE18A, it offers identical protection performance but with JEDEC-standardized marking and broader distributor availability.
Availability
1N6277ARL4 is available at Aetrix Electronics and suitable for industrial power supplies, RS-485 communication interfaces, and medical auxiliary power systems requiring stable component supply and long-term obsolescence management.
Supply support for 1N6277ARL4 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 management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The 1N6277ARL4 belongs to the Mosorb 1500 W TVS diode family, engineered specifically for high-reliability transient suppression in harsh industrial and telecom environments where UL certification and repeatable clamping performance are mandatory.
FAQ
What is the clamping voltage of the 1N6277ARL4 under full-rated surge conditions?
The 1N6277ARL4 clamps to a maximum of 25.2 V when subjected to its rated peak pulse current of 59.5 A (1 ms, 10/1000 µs waveform). This value is measured per Figure 5 in the official datasheet and represents the worst-case voltage imposed on the protected circuit during surge events, ensuring compatibility with 24 V nominal systems where downstream ICs tolerate up to 36 V.
Is the 1N6277ARL4 RoHS compliant and lead-free?
Yes, the 1N6277ARL4 uses a Pb-free external lead finish as confirmed in the "Mechanical Characteristics" section of the datasheet. It complies with RoHS Directive 2011/65/EU and is qualified for lead-free soldering processes, including wave and reflow, with maximum lead temperature of 230°C for 10 seconds at 1/16″ from the case.
Does the 1N6277ARL4 have UL recognition, and for what standard?
Yes, the 1N6277ARL4 carries UL 497B recognition under file #116110, specifically for isolated loop circuit protection. This certification covers testing for strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge performance-validating its use in safety-critical telecom and industrial data line applications.
How does the 1N6277ARL4 differ from the 1.5KE18A?
The 1N6277ARL4 and 1.5KE18A share identical electrical specifications-including 15.3 V VRWM, 18 V VBR, 25.2 V VC @ 59.5 A IPP-and are packaged identically in Case 41A axial format. They differ only in part numbering convention: 1N6277A follows JEDEC registration, while 1.5KE18A is ON Semiconductor's proprietary designation. Both are manufactured on the same Mosorb process line.
What is the maximum steady-state power dissipation for the 1N6277ARL4?
The 1N6277ARL4 is rated for 5.0 W steady-state power dissipation at a lead temperature (TL) of 75°C with 3/8″ lead length. Power must be derated linearly above 75°C at 20 mW/°C, reaching zero dissipation at TL = 100°C, as defined in the "Maximum Ratings" table of the datasheet.
1N6277ARL4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-201AD, Axial
- Series:
- Mosorb™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 15.3V
- Voltage - Breakdown (Min):
- 17.1V
- Voltage - Clamping (Max) @ Ipp:
- 25.2V
- 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
1N6277ARL4 FAQ
1.How can I place an order for 1N6277ARL4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6277ARL4 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 1N6277ARL4 reliable?
The price and inventory of 1N6277ARL4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6277ARL4 is usually 5 days.
3.What payment methods are accepted for 1N6277ARL4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6277ARL4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6277ARL4?
1N6277ARL4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6277ARL4 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 1N6277ARL4?
For technical support, including 1N6277ARL4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6277ARL4 requirements.
6.How does Aetrix verify that 1N6277ARL4 is sourced from the original manufacturer or authorized distributors?
All 1N6277ARL4 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 1N6277ARL4 meets industry standards.
7.What is the process for return or replacement of 1N6277ARL4?
All 1N6277ARL4 units undergo pre-shipment inspection (PSI). If there is an issue with 1N6277ARL4, 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 1N6277ARL4 part is unused and in its original packaging.
Return procedure for 1N6277ARL4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N6277ARL4 Tags
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