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onsemi 1N6281ARL4
- Part No.:
- 1N6281ARL4
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
1N6281ARL4.pdf
- Description:
- TVS DIODE 23.1VWM 37.5VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:2,931
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Product details
Overview
1N6281ARL4 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 23.1 V, clamping voltage (VC) of 37.5 V at 40 A peak pulse current (IPP), and response time <1 ns. It is used in industrial power supplies to safeguard downstream MOS/CMOS ICs from lightning-induced transients.
For engineers reviewing the 1N6281ARL4 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin over DC bus voltage, VC vs. protected device's absolute maximum rating, surge current capability per IEC 61000-4-5, and UL 497B recognition for isolated loop circuits.
Technical Context
This unidirectional TVS operates as a voltage-clamped shunt protector: under normal bias it presents <5 µA leakage above 10 V; during transients exceeding VBR (25.7–28.4 V), it avalanches to clamp voltage at ≤37.5 V while conducting up to 40 A peak pulse current (1 ms, 8.3 ms half-sine). Its low dynamic impedance ensures stable clamping across pulse widths from 10 µs to 100 ms.
Manufactured in Surmetic axial-leaded plastic package (Case 41A), it delivers thermal resistance of 20 °C/W (junction-to-lead) and supports soldering at 230 °C for 10 seconds at 1/16″ from case. Polarity is marked by cathode band; mounting position is unrestricted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500 W @ 1 ms - sustains single high-energy surges without failure |
| Working Peak Reverse Voltage (VRWM) | 23.1 V - maximum continuous reverse voltage before significant leakage |
| Clamping Voltage (VC) | 37.5 V @ 40 A IPP - limits transient voltage seen by protected circuit |
| Breakdown Voltage (VBR) | 25.7–28.4 V @ 1 mA IT - precise avalanche onset range for predictable triggering |
| Leakage Current (IR) | <5 µA @ 23.1 V - negligible standby power loss and signal interference |
| Response Time | <1 ns - enables protection of fast-edge digital interfaces and switching nodes |
| ESD Rating | Class 3 (>16 kV HBM) - meets stringent electrostatic discharge immunity requirements |
Pinout & Package
1N6281ARL4 is housed in an axial-leaded Surmetic plastic package (JEDEC Case 41A), with cathode identified by a colored band on the body. Leads are tin-plated, solderable, and rated for 230 °C for 10 seconds at 1/16″ from case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to system ground or lowest potential node in clamping configuration |
| Cathode | High-side clamping terminal | Connected to protected line (e.g., +24 V rail); polarity band marks this pin |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition (QVGV2) | Validated for isolated loop circuit protection - satisfies safety certification requirements without additional external components |
| 1500 W Peak Pulse Power | Handles IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 24 V systems with margin |
| Low Clamping Ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage stress on protected ICs relative to breakdown threshold |
| Pb-Free Lead Finish | Complies with RoHS Directive 2011/65/EU - suitable for lead-free reflow and wave soldering processes |
| Thermal Resistance (RJL) | 20 °C/W - enables reliable power dissipation with minimal PCB copper area |
Applications
| Industrial Power Supply Protection | Medical Equipment Input Stage |
|---|---|
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: Shunt clamping TVS placed directly across input terminals to divert surge energy before it reaches upstream rectifier and downstream DC-DC controller. Use Value: Limits transient voltage to ≤37.5 V, protecting 40 V-rated input capacitors and 36 V max-rated buck controller ICs from overstress. |
Use Scenario: Isolated sensor interface board in diagnostic imaging equipment, connected via long cables to external probes subject to ESD and cable discharge events. IC Role / Device Role / Timing Role: Primary-level transient suppressor at connector entry point, preceding isolation barrier and signal conditioning amplifiers. Use Value: UL 497B recognition validates safe operation in patient-connected circuits; <1 ns response prevents ESD-induced latch-up in precision analog front-ends. |
| Process Control Signal Line | Telecom Power Interface |
Use Scenario: 24 V loop-powered analog current transmitter (4–20 mA) in hazardous-area field instrumentation. IC Role / Device Role / Timing Role: Unidirectional clamping device on supply rail to absorb induced surges from nearby motor drives or relay switching. Use Value: 23.1 V VRWM provides 3.9 V margin above nominal 24 V rail, ensuring no conduction during normal operation while enabling fast clamping during transients. |
Use Scenario: -48 V DC power feed in central office line card, subjected to lightning-induced longitudinal surges on tip/ring pairs. IC Role / Device Role / Timing Role: Secondary-stage protector after gas discharge tube (GDT), providing low-clamp refinement for semiconductor-level protection. Use Value: 37.5 V clamping voltage ensures protected PoE controller ICs (rated 40–45 V) remain within safe operating area during combined GDT+TVS coordinated surge suppression. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24A | Surface-mount SMB package; lower 600 W peak power; VRWM = 24.0 V; VC = 38.9 V @ 15.4 A | Requires PCB layout change; suited for space-constrained designs where axial leads are impractical | Select when board real estate is limited and surge duty is moderate (IEC 61000-4-5 Level 2–3) |
| 1.5KE27A | Same axial package and 1500 W rating; higher VRWM = 25.6 V; VC = 41.4 V @ 36 A; VBR = 28.5–31.5 V | Offers greater VRWM margin for 28 V systems but increases clamping voltage by 3.9 V | Select when protecting 28 V rails where 23.1 V VRWM is insufficient and higher clamping can be tolerated |
Compared with 1N6281ARL4, SMBJ24A trades off surge capacity and through-hole compatibility for compactness, while 1.5KE27A raises both operating voltage margin and clamping level-requiring verification that protected devices tolerate 41.4 V transients.
Availability
1N6281ARL4 is available at Aetrix Electronics and suitable for industrial power supplies, medical equipment input stages, process control transmitters, and telecom power interfaces requiring stable component supply and certified surge protection.
Supply support for 1N6281ARL4 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 part of onsemi) is a global semiconductor supplier specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The 1N6267A Series is part of ON Semiconductor's Mosorb TVS portfolio, engineered specifically for robust, high-power transient suppression in harsh industrial and medical environments where reliability and safety certification are mandatory.
FAQ
What is the maximum clamping voltage of the 1N6281ARL4 under surge conditions?
The 1N6281ARL4 has a maximum clamping voltage (VC) of 37.5 V when subjected to its rated peak pulse current of 40 A (1 ms exponential waveform). This value is guaranteed per the ON Semiconductor datasheet and defines the upper voltage limit imposed on protected circuitry during transient events. The 1N6281ARL4 maintains this clamping performance across ambient temperatures from −65 °C to +175 °C.
Is the 1N6281ARL4 RoHS-compliant and lead-free?
Yes, the 1N6281ARL4 uses a Pb-free external lead finish, fully compliant with the EU RoHS Directive 2011/65/EU. Its Surmetic axial package is manufactured with lead-free solderability in mind, supporting standard lead-free reflow and wave soldering profiles. The 1N6281ARL4 datasheet explicitly states "These devices are manufactured with a Pb−Free external lead finish only."
Does the 1N6281ARL4 meet UL safety standards?
Yes, the 1N6281ARL4 is UL Recognized under UL 497B (File #116110, Category QVGV2) for isolated loop circuit protection. This certification covers critical tests including strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge performance-validating its use in safety-critical applications such as medical and industrial control systems. The 1N6281ARL4 shares this recognition with the full 1N6267A series.
What is the working peak reverse voltage (VRWM) specification for the 1N6281ARL4?
The 1N6281ARL4 has a working peak reverse voltage (VRWM) of 23.1 V, meaning it remains in high-impedance state with leakage <5 µA up to this DC or continuous peak reverse voltage. This parameter ensures reliable blocking during normal operation while allowing fast avalanche conduction when transients exceed the breakdown range (25.7–28.4 V). The 1N6281ARL4 VRWM is selected to provide margin above common 24 V industrial rails.
How does the 1N6281ARL4 compare to bidirectional TVS diodes like 1.5KE27CA?
The 1N6281ARL4 is unidirectional and optimized for DC-biased lines (e.g., +24 V rails), offering tighter clamping and lower leakage than bidirectional equivalents. In contrast, 1.5KE27CA protects AC or bipolar signals but exhibits higher capacitance and symmetrical clamping. For a +24 V system, the 1N6281ARL4 provides superior protection efficiency and lower standby loss. The 1N6281ARL4 cannot replace 1.5KE27CA in AC-coupled or floating applications.
1N6281ARL4 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):
- 23.1V
- Voltage - Breakdown (Min):
- 25.7V
- Voltage - Clamping (Max) @ Ipp:
- 37.5V
- 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
1N6281ARL4 FAQ
1.How can I place an order for 1N6281ARL4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6281ARL4 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 1N6281ARL4 reliable?
The price and inventory of 1N6281ARL4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6281ARL4 is usually 5 days.
3.What payment methods are accepted for 1N6281ARL4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6281ARL4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6281ARL4?
1N6281ARL4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6281ARL4 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 1N6281ARL4?
For technical support, including 1N6281ARL4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6281ARL4 requirements.
6.How does Aetrix verify that 1N6281ARL4 is sourced from the original manufacturer or authorized distributors?
All 1N6281ARL4 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 1N6281ARL4 meets industry standards.
7.What is the process for return or replacement of 1N6281ARL4?
All 1N6281ARL4 units undergo pre-shipment inspection (PSI). If there is an issue with 1N6281ARL4, 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 1N6281ARL4 part is unused and in its original packaging.
Return procedure for 1N6281ARL4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N6281ARL4 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
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Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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