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onsemi 1N6285A
- Part No.:
- 1N6285A
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
1N6285A.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:8,361
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Product details
Overview
1N6285A 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 33.3 V working peak reverse voltage (VRWM), 39 V breakdown voltage (VBR) at 1 mA, and clamps to 53.9 V at 28 A peak pulse current (IPP), making it suitable for protecting power supply rails and I/O lines in industrial power supplies and communication interfaces.
For engineers reviewing the 1N6285A datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to system operating voltage, surge current handling under 1 ms pulses, UL 497B recognition for isolated loop protection, and axial leaded Surmetic package compatibility with through-hole PCB assembly.
Technical Context
The 1N6285A operates as a silicon avalanche diode with fast <1 ns response time and low dynamic impedance, enabling effective suppression of ESD and lightning-induced transients. Its unidirectional configuration provides reverse-biased clamping only, requiring correct polarity placement across protected nodes.
Thermal performance is defined by 20 °C/W junction-to-lead thermal resistance and 5.0 W steady-state power dissipation at 75 °C lead temperature, with derating above that point. It meets Class 3 (>16 kV) HBM ESD rating and UL 497B certification for isolated loop circuit protection.
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) | 33.3 V - maximum continuous DC or peak AC voltage before clamping initiates |
| Breakdown Voltage (VBR) | 39 V @ 1 mA - precise avalanche onset threshold for predictable clamping start |
| Clamping Voltage (VC) | 53.9 V @ 28 A IPP - maximum voltage seen by protected circuit during worst-case surge |
| Leakage Current (IR) | <5 µA @ VRWM - negligible standby power loss and minimal interference with signal integrity |
| Response Time | <1 ns - ensures clamping activation before transient energy damages downstream ICs |
| ESD Rating | Class 3 (>16 kV) HBM - qualifies for robust electrostatic discharge immunity in handling and operation |
Pinout & Package
Package: Axial-leaded Surmetic plastic case (Case 41A), void-free transfer-molded thermosetting material with corrosion-resistant, solderable leads. Cathode indicated by polarity band. Mounting position unrestricted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node in unidirectional clamping configuration |
| Cathode | High-side clamping terminal | Connected to protected line (e.g., VCC rail or signal input); polarity band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition | Qualified for isolated loop circuit protection - enables compliance in telecom and industrial safety-critical designs |
| Low Clamping Ratio (VC/VBR) | 1.38 - tight voltage margin between breakdown and clamp ensures minimal overvoltage stress on protected ICs |
| Pb-Free Lead Finish | RoHS-compliant termination - supports lead-free reflow and hand-soldering without reliability compromise |
| High Surge Robustness | 28 A IPP at 1 ms - withstands repetitive or single-event surges per IEC 61000-4-5 Level 4 requirements |
| Stable Temperature Coefficient | 0.1 %/°C - predictable VBR drift over temperature avoids false triggering or insufficient clamping |
Applications
| Industrial Power Supply Protection | Telecom Line Interface Protection |
|---|---|
Use Scenario: Protecting 24 V DC input rails in programmable logic controllers (PLCs) against induced lightning surges and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS placed across input terminals to clamp transients before they reach upstream regulators and microcontrollers. Use Value: Limits voltage excursion to 53.9 V during 28 A surges, preserving 36 V-rated input capacitors and preventing latch-up in 3.3 V/5 V logic domains. |
Use Scenario: Safeguarding RS-485 transceiver I/O pins in building automation gateways exposed to long cable runs and ground potential differences. IC Role / Device Role / Timing Role: Parallel-connected clamping device referenced to local ground, absorbing common-mode surges coupled onto differential pairs. Use Value: Sub-1 ns response prevents data corruption during fast-rising transients; UL 497B qualification validates use in safety-isolated communication loops. |
| Medical Equipment Power Input | Automotive Body Control Module (BCM) Inputs |
Use Scenario: Shielding auxiliary 12 V power inputs in diagnostic imaging peripherals from ESD events and load dump coupling via shared chassis grounds. IC Role / Device Role / Timing Role: Primary overvoltage protector at board-level entry point, coordinated with upstream fuses and downstream LC filters. Use Value: 1500 W peak power rating handles multi-pulse surge sequences per IEC 61000-4-4; low leakage avoids signal path loading in low-power standby modes. |
Use Scenario: Protecting wake-up inputs and sensor supply lines in BCMs subjected to ISO 7637-2 pulse 1 (inductive load dump) and pulse 2a (load disconnect). IC Role / Device Role / Timing Role: Standoff clamping element on 12 V distribution net, triggered only during overvoltage excursions beyond normal vehicle battery range. Use Value: 33.3 V VRWM aligns with automotive 12 V nominal systems; 53.9 V VC ensures MCU GPIOs and analog sensors remain within absolute maximum ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1.5KE39A | Same electrical specs (33.3 V VRWM, 39 V VBR, 53.9 V VC @ 28 A), identical Case 41A package, Pb-free finish | No functional difference; JEDEC vs. ON Semiconductor proprietary part numbering only | Select 1.5KE39A when sourcing from distributors listing ON Semiconductor's preferred device code |
| SMBJ33A | Surface-mount SMB package; lower 600 W peak power; 33 V VRWM; 53.3 V VC @ 12.3 A IPP | Not suitable for high-current 1 ms surges; requires PCB layout change and reduced surge margin | Choose SMBJ33A only for space-constrained designs where 1500 W capability is not required |
Compared with 1N6285A, 1.5KE39A offers identical protection performance in the same axial package, while SMBJ33A trades surge capacity and through-hole compatibility for board area savings - making the former a direct form-fit-function alternative and the latter a design-compromise option.
Availability
1N6285A is available at Aetrix Electronics and suitable for industrial power supplies, telecom interface modules, medical equipment inputs, and automotive body control systems requiring stable component supply and long-term obsolescence management.
Supply support for 1N6285A 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 manufacturer specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The 1N6285A belongs to the Mosorb 1500 W TVS series, engineered specifically for high-reliability transient suppression in harsh environments where UL recognition, surge robustness, and stable clamping behavior are mandatory.
FAQ
What is the clamping voltage of the 1N6285A under maximum rated surge current?
The 1N6285A clamps to 53.9 V at its rated peak pulse current of 28 A, measured with a 1 ms exponential waveform per Figure 5 in the datasheet. This value defines the upper voltage limit imposed on protected circuits during worst-case transient events and must be verified against the absolute maximum ratings of downstream components when selecting the 1N6285A for a specific design.
Is the 1N6285A RoHS compliant and lead-free?
Yes, the 1N6285A 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 and supports lead-free soldering processes with a maximum lead temperature of 230°C for 10 seconds at 1/16 inch from the case - a specification confirmed in the official ON Semiconductor documentation for the 1N6285A.
Does the 1N6285A meet UL 497B certification?
Yes, the 1N6285A is UL Recognized under file #116110 for protectors (QVGV2) per UL 497B, specifically for isolated loop circuit protection. This certification covers dielectric withstand, endurance conditioning, and strike voltage breakdown testing - and applies directly to the 1N6285A as part of the fully recognized 1N6267A series, as documented in the "UL RECOGNITION" section of the datasheet.
How does the 1N6285A differ from bidirectional TVS diodes like 1N6285CA?
The 1N6285A is unidirectional and clamps only in reverse bias, whereas 1N6285CA (not a standard part number but representative of CA-suffix variants) would provide symmetrical clamping for AC or bipolar signal lines. The 1N6285A datasheet confirms unidirectional operation, and no CA variant exists for this exact JEDEC code - bidirectional equivalents require 1.5KE39CA with different test conditions and dual-directional parameters, making them functionally distinct for the 1N6285A.
What is the maximum steady-state power dissipation for the 1N6285A at elevated temperatures?
The 1N6285A dissipates up to 5.0 W continuously at a lead temperature (TL) of 75°C, with linear derating of 20 mW/°C above that point. This thermal limit is defined in the "Maximum Ratings" table and assumes 3/8 inch lead length; exceeding it risks thermal runaway or parametric shift. Engineers must verify actual board-level thermal performance using the 20 °C/W junction-to-lead resistance when applying the 1N6285A in sustained surge or high-ambient environments.
1N6285A 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):
- 33.3V
- Voltage - Breakdown (Min):
- 37.1V
- Voltage - Clamping (Max) @ Ipp:
- 53.9V
- 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
1N6285A FAQ
1.How can I place an order for 1N6285A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6285A 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 1N6285A reliable?
The price and inventory of 1N6285A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6285A is usually 5 days.
3.What payment methods are accepted for 1N6285A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6285A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6285A?
1N6285A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6285A 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 1N6285A?
For technical support, including 1N6285A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6285A requirements.
6.How does Aetrix verify that 1N6285A is sourced from the original manufacturer or authorized distributors?
All 1N6285A 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 1N6285A meets industry standards.
7.What is the process for return or replacement of 1N6285A?
All 1N6285A units undergo pre-shipment inspection (PSI). If there is an issue with 1N6285A, 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 1N6285A part is unused and in its original packaging.
Return procedure for 1N6285A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N6285A Tags
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Nexperia USA Inc.
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