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onsemi 1N6281A
- Part No.:
- 1N6281A
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
1N6281A.pdf
- Description:
- TVS DIODE 23.1VWM 37.5VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:3,684
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Product details
Overview
1N6281A 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 23.1 V working peak reverse voltage (VRWM), 27 V breakdown voltage (VBR) at 1 mA test current, and clamps to ≤37.5 V at 40 A peak pulse current (IPP), making it suitable for industrial power supply input stage surge protection.
For engineers reviewing the 1N6281A datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to protected IC's absolute maximum rating, VRWM compatibility with DC bus voltage, UL 497B recognition for isolated loop circuits, and axial leaded Surmetic package suitability for through-hole board-level surge hardening.
Technical Context
The 1N6281A operates as a silicon avalanche diode in reverse-biased mode, entering controlled breakdown when transient voltage exceeds its VBR of 27 V (min) / 28.4 V (max). Its low dynamic impedance ensures stable clamping under 1 ms 1500 W pulses, with response time typically under 1 ns.
It is rated for steady-state power dissipation of 5.0 W at TL ≤ 75°C with 3/8″ lead length, and exhibits <5 µA leakage above 10 V. The device meets ESD Class 3 (>16 kV HBM) and is UL 497B recognized for isolated loop circuit protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 23.1 V - Maximum continuous reverse operating voltage before clamping begins; must exceed protected circuit's peak DC voltage. |
| VBR @ IT=1 mA | 25.7–28.4 V - Breakdown threshold range; defines onset of avalanche conduction during transient events. |
| VC @ IPP=40 A | ≤37.5 V - Maximum clamped voltage during 1 ms pulse; determines worst-case overvoltage seen by downstream components. |
| PPK | 1500 W @ 1 ms - Peak surge power handling capability; validates robustness against IEC 61000-4-5 Level 4 surges. |
| IR @ VRWM | ≤5 µA - Reverse leakage current at working voltage; ensures minimal standby power loss and signal integrity. |
| Response Time | <1 ns - Avalanche turn-on speed; enables suppression before fast-rising transients damage CMOS/MOS inputs. |
| ESD Rating | Class 3 (>16 kV HBM) - Confirmed electrostatic discharge immunity per JEDEC JS-001; supports handling without special precautions. |
| UL Recognition | UL 497B (QVGV2) - Certified for use in telecom/data line protectors; validates dielectric withstand and endurance under repeated surges. |
Pinout & Package
Package: Axial-leaded Surmetic plastic case (Case 41A), void-free thermosetting epoxy, Pb-free external finish, cathode indicated by polarity band. Mounting position unrestricted; max solder temperature 230°C at 1/16″ from case for 10 s.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-biased reference terminal | Connected to system ground or low-impedance return path; forms clamping node with cathode. |
| Cathode | Transient voltage sensing node | Connected to protected line (e.g., DC input rail); conducts avalanche current to anode during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Supports IEC 61000-4-5 4th edition surge testing (2 Ω source, 12 A/10/700 µs) without degradation. |
| Clamp-to-breakdown ratio VC/VBR ≈ 1.39 | Provides tight voltage margin between clamping and breakdown-critical for protecting 3.3 V/5 V logic rails with headroom. |
| UL 497B recognition | Validates compliance for telecom/data line isolation barriers, eliminating need for additional certification effort in end equipment. |
| Low zener impedance & <1 ns response | Minimizes overshoot during fast transients (e.g., EFT bursts), reducing risk of latch-up or gate oxide rupture in MOSFET drivers. |
| Pb-free Surmetic axial package | Enables RoHS-compliant through-hole assembly with industry-standard wave solder profiles and mechanical reliability. |
Applications
| Industrial Power Supply Input Protection | Telecom Line Interface Protection |
|---|---|
Use Scenario: 24 V DC industrial power supply input subjected to load dump and lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed across input terminals to shunt surge energy to ground before reaching upstream regulator ICs. Use Value: Clamps 1500 W transients to ≤37.5 V, preserving 40 V-rated input capacitors and preventing brownout or reset in microcontrollers. |
Use Scenario: RS-485 data line interface exposed to induced surges in factory automation networks. IC Role / Device Role / Timing Role: Primary surge limiter on differential pair, referenced to local ground, absorbing common-mode transients before receiver inputs. Use Value: UL 497B recognition ensures compliance for isolated data ports; low capacitance avoids signal integrity degradation at 10 Mbps. |
| Medical Equipment AC/DC Adapter Input | Programmable Logic Controller (PLC) Digital I/O Protection |
Use Scenario: Mains-connected medical device adapter input requiring reinforced insulation and surge immunity per IEC 60601-1. IC Role / Device Role / Timing Role: First-line transient suppressor on secondary-side DC output, coordinated with fuse and MOV for staged protection. Use Value: 23.1 V VRWM aligns with 24 V nominal outputs; Class 3 ESD rating prevents field failures during service technician handling. |
Use Scenario: 24 V digital input module in PLC rack exposed to inductive kickback from solenoid switching. IC Role / Device Role / Timing Role: Discrete TVS across optocoupler input LED terminals to absorb flyback energy and prevent false triggering. Use Value: Fast <1 ns response captures sub-microsecond spikes; axial package allows easy replacement in field-serviceable modules. |
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; 24 V VRWM; 38.9 V VC @ 38.8 A; lower PPK (600 W). | Designed for PCB space-constrained designs; lacks UL 497B recognition; higher clamping voltage than 1N6281A. | Select SMBJ24A only when SMT layout and lower surge level (IEC 61000-4-5 Level 3) suffice. |
| 1.5KE27A | Same manufacturer, identical electrical specs (23.1 V VRWM, 27 V VBR, 37.5 V VC), but in 1.5KE series marking format. | No functional difference; dual-marking reflects ON Semiconductor's internal part numbering convention (JEDEC vs. proprietary). | 1.5KE27A is electrically identical and interchangeable with 1N6281A; choice depends on procurement channel preference. |
Compared with SMBJ24A, the 1N6281A offers higher surge robustness (1500 W vs. 600 W) and regulatory certification (UL 497B), while 1.5KE27A provides identical performance in an alternate marking scheme-making it a direct functional match without design change.
Availability
1N6281A is available at Aetrix Electronics and suitable for industrial power supplies, telecom interfaces, medical adapters, and PLC I/O modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N6281A 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 1N6281A belongs to the Mosorb 1N6267A Series of unidirectional TVS diodes, engineered specifically for high-reliability surge protection in harsh industrial and communications environments where UL recognition and repeatable clamping performance are mandatory.
FAQ
What is the clamping voltage of the 1N6281A under a 40 A transient pulse?
The 1N6281A clamps to a maximum of 37.5 V when subjected to a 40 A peak pulse current (IPP), as specified in the Electrical Characteristics table. This value is measured under standardized 1 ms pulse conditions and represents the worst-case voltage imposed on protected circuitry during surge events. Designers must verify that this clamping level remains below the absolute maximum voltage rating of downstream components such as regulators or microcontrollers. The 1N6281A achieves this with low dynamic impedance and sub-nanosecond response.
Is the 1N6281A RoHS compliant and lead-free?
Yes, the 1N6281A uses a Pb-free external lead finish, as explicitly stated in the "Mechanical Characteristics" section of the datasheet. It complies with RoHS Directive 2011/65/EU requirements for hazardous substances. The Surmetic axial package is void-free, transfer-molded, and corrosion-resistant, supporting standard wave soldering processes at 230°C for 10 seconds at 1/16″ from the case. The 1N6281A is not intended for surgical implant or life-support systems.
Does the 1N6281A have UL recognition, and for what standard?
Yes, the 1N6281A carries UL 497B recognition under file #116110, specifically for isolated loop circuit protection (category QVGV2). This certification covers rigorous testing including strike voltage breakdown, endurance conditioning, temperature cycling, dielectric withstand, and discharge performance. UL 497B validation confirms suitability for telecom/data line isolation barriers-unlike generic surge ratings, this is a formal safety listing applicable to end-equipment certification.
How does the 1N6281A differ from the 1.5KE27A?
The 1N6281A and 1.5KE27A are electrically identical devices from ON Semiconductor, sharing identical VRWM (23.1 V), VBR (25.7–28.4 V), VC (≤37.5 V @ 40 A), and package (Case 41A axial). The difference lies solely in part numbering: 1N6281A follows JEDEC registration, while 1.5KE27A uses ON Semiconductor's proprietary device code. Both are marked on the same physical device and are fully interchangeable in design and procurement without any circuit or layout changes required for the 1N6281A.
What is the maximum steady-state power dissipation for the 1N6281A?
The 1N6281A has a steady-state power dissipation (PD) rating of 5.0 W at a lead temperature (TL) of ≤75°C with 3/8″ lead length. Above 75°C, PD derates linearly at 20 mW/°C, reaching zero at 125°C TL. This rating applies to continuous DC or low-frequency reverse bias conditions-not transient suppression. Engineers must ensure adequate heatsinking or airflow if the 1N6281A experiences sustained reverse leakage near its VRWM, especially in high-ambient environments.
1N6281A 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):
- 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
1N6281A FAQ
1.How can I place an order for 1N6281A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6281A 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 1N6281A reliable?
The price and inventory of 1N6281A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6281A is usually 5 days.
3.What payment methods are accepted for 1N6281A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6281A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6281A?
1N6281A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6281A 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 1N6281A?
For technical support, including 1N6281A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6281A requirements.
6.How does Aetrix verify that 1N6281A is sourced from the original manufacturer or authorized distributors?
All 1N6281A 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 1N6281A meets industry standards.
7.What is the process for return or replacement of 1N6281A?
All 1N6281A units undergo pre-shipment inspection (PSI). If there is an issue with 1N6281A, 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 1N6281A part is unused and in its original packaging.
Return procedure for 1N6281A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N6281A Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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onsemi
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Diodes Incorporated
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D5V0P1B2LP-7B
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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Diodes Incorporated
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