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Vishay General Semiconductor - Diodes Division 1N6281A-E3/73
- Part No.:
- 1N6281A-E3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1N6281A-E3/73.pdf
- Description:
- TVS DIODE 23.1VWM 37.5VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:4,177
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Product details
Overview
1N6281A-E3/73 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode designed for primary-level overvoltage protection in power rails and signal lines. It features a 27 V breakdown voltage (VBR = 25.7–28.4 V at 1.0 mA), 1500 W peak pulse power (10/1000 µs), clamping voltage of 37.5 V at 40.0 A, and operates across –55 °C to +175 °C junction temperature. It is used to protect MOSFETs, ICs, and sensor interfaces against lightning-induced surges and inductive switching transients.
For engineers reviewing the 1N6281A-E3/73 datasheet, 1N6281A-E3/73 pinout, 1N6281A-E3/73 application, or 1N6281A-E3/73 equivalent, this page delivers verified electrical parameters, JEDEC 1.5KE package details, clamping performance under standardized surge waveforms, thermal resistance data, and RoHS-compliant commercial-grade sourcing context - all specific to the 1N6281A-E3/73 variant.
Technical Context
This device implements a glass-passivated silicon PN junction optimized for fast transient response (<1 ns) and low incremental surge resistance. Its unidirectional polarity uses a cathode band marking and exhibits 23.1 V stand-off voltage (VWM) with ≤1.0 µA reverse leakage at rated voltage.
The 1N6281A-E3/73 is rated for 1500 W peak pulse power per 10/1000 µs waveform, derated linearly above 25 °C ambient, and supports 200 A non-repetitive forward surge current (8.3 ms half-sine). Thermal resistance is 15.4 °C/W junction-to-lead, enabling robust power dissipation in PCB-mounted applications without heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 25.7 V / 28.4 V at 1.0 mA - defines reliable conduction onset during overvoltage events |
| VWM | 23.1 V - maximum continuous reverse operating voltage before leakage exceeds 1.0 µA |
| VC @ IPPM | 37.5 V at 40.0 A - clamped voltage limiting downstream component stress during 10/1000 µs surge |
| PPPM | 1500 W - peak transient energy absorption capability under standardized surge waveform |
| TJ range | –55 °C to +175 °C - enables deployment in automotive engine bays and industrial control cabinets |
| RθJL | 15.4 °C/W - low thermal resistance supports sustained power handling with minimal PCB copper area |
| Package | JEDEC 1.5KE - axial-leaded, molded epoxy case meeting UL 94 V-0 flammability rating |
Pinout & Package
1N6281A-E3/73 uses the standard JEDEC 1.5KE axial-leaded package: matte tin-plated leads, 0.375" (9.5 mm) lead length, 0.210" (5.3 mm) body diameter, and cathode band marking on one end. The device has two terminals: anode and cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias | Connected to lower-potential side of protected circuit; carries surge current into device during clamping |
| Cathode (banded end) | Current exit point in forward bias; high-impedance terminal in reverse standby | Connected to higher-potential rail (e.g., VCC); defines polarity-sensitive placement in DC power line protection |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| 1500 W peak pulse power (10/1000 µs) | Supports protection against severe transients including ISO 7637-2 Pulse 5a and IEC 61000-4-5 Level 4 surges |
| Clamping ratio (VC/VBR) ≈ 1.39 | Minimizes voltage overshoot during clamping, reducing risk of latch-up or gate oxide damage in protected MOSFETs |
| Response time < 1 ns | Faster than MOVs or gas discharge tubes, enabling protection of high-speed digital interfaces and precision analog circuits |
| RoHS-compliant E3 suffix | Meets JESD 201 Class 1A whisker resistance, suitable for automated assembly and high-reliability commercial applications |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V supply lines in vehicle ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Primary shunt clamp placed between VBAT and GND, absorbing >1000 W surges within nanoseconds. Use Value: Prevents permanent failure of microcontrollers and CAN transceivers by limiting rail voltage to ≤37.5 V during 10/1000 µs pulses. |
Use Scenario: Safeguarding 4–20 mA current loop inputs in PLC analog modules from field wiring surges. IC Role / Device Role / Timing Role: Unidirectional TVS connected across input terminals to clamp induced common-mode transients. Use Value: Maintains signal integrity below 23.1 V stand-off while surviving repeated 1500 W surges without parameter drift. |
| Consumer Power Adapter Output Protection | Telecom Line Card Surge Suppression |
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters powering USB-C PD devices. IC Role / Device Role / Timing Role: Standby-mode protector on +5 V/9 V/15 V output rails, activated only during fault conditions. Use Value: Enables compliance with IEC 62368-1 transient immunity requirements using a single discrete component. |
Use Scenario: Front-end protection of Ethernet PHY interfaces exposed to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: First-stage clamp on differential pairs, coordinated with common-mode chokes and secondary TVS arrays. Use Value: Limits differential surge voltage to <37.5 V before reaching magnetics, preserving PHY IC ESD structures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28A | DO-214AA package, 28 V VBR, 600 W PPPM, 10.5 mm × 6.2 mm footprint | Lower power rating; suited for space-constrained PCBs where 1500 W is not required | Select SMBJ28A when board area is limited and surge threat level is ≤600 W (e.g., indoor consumer electronics). |
| 1.5KE27A | Same 1.5KE package, identical VBR/VC/PPPM; differs only in packaging suffix (E3/73 vs. E3/54 tape-and-reel) | No functional difference; identical electrical and thermal performance | 1.5KE27A is a direct form-fit-function match - use when reel quantity (1400 pcs) or delivery mode (13" paper tape) aligns with production needs. |
Compared with SMBJ28A, the 1N6281A-E3/73 delivers 2.5× higher surge power handling in the same voltage class but requires larger axial-leaded layout space; compared with 1.5KE27A, it shares identical protection characteristics but differs only in packaging configuration and reel orientation - making it suitable for legacy 1.5KE-based designs requiring E3/73-specific logistics.
Availability
1N6281A-E3/73 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom line card surge suppression requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for 1N6281A-E3/73 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, and protection devices with emphasis on reliability, power handling, and automotive qualification.
The 1N6281A-E3/73 belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-energy transient suppression in harsh environments - targeting design-in for automotive, industrial, and infrastructure applications where failure modes must be mitigated at the component level.
FAQ
What is the breakdown voltage tolerance for 1N6281A-E3/73?
The 1N6281A-E3/73 has a specified breakdown voltage range of 25.7 V to 28.4 V at 1.0 mA test current, representing ±5% tolerance around the nominal 27 V rating. This tight VBR window ensures predictable clamping onset across production lots and temperature extremes, critical for coordinating with downstream overvoltage lockout thresholds in protected systems.
Is 1N6281A-E3/73 RoHS compliant and lead-free?
Yes, the 1N6281A-E3/73 carries the E3 suffix, indicating full RoHS compliance per Directive 2011/65/EU and exemption 7a. Its matte tin-plated leads meet J-STD-002 solderability standards and JESD 201 Class 1A whisker resistance testing, confirming suitability for lead-free reflow and high-reliability commercial applications without post-process mitigation.
How does the clamping voltage of 1N6281A-E3/73 compare to its breakdown voltage?
The 1N6281A-E3/73 clamps at 37.5 V when subjected to its rated 40.0 A peak pulse current (10/1000 µs), yielding a clamping ratio (VC/VBR) of approximately 1.39. This ratio reflects low dynamic impedance during surge events and ensures protected components experience less than 37.5 V overshoot - well below typical 40 V absolute maximum ratings of many 24 V-rated ICs and MOSFETs.
Can 1N6281A-E3/73 be used in bidirectional configurations?
No, the 1N6281A-E3/73 is a unidirectional TVS diode, identified by its cathode band marking and specified VBR/VWM values for reverse-biased operation only. For bidirectional protection at 27 V, the functionally matched part is 1N6281CA-E3/73 (or 1.5KE27CA), which provides symmetrical clamping in both polarities and omits the polarity band.
What is the thermal resistance and maximum power dissipation of 1N6281A-E3/73?
The 1N6281A-E3/73 has a typical junction-to-lead thermal resistance (RθJL) of 15.4 °C/W and a steady-state power dissipation (PD) of 6.5 W at TL = 75 °C. This allows continuous operation at full rated power when leads are soldered to sufficient copper area, and supports short-duration 1500 W surges without thermal runaway due to its low RθJL and high TJmax of 175 °C.
1N6281A-E3/73 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- TransZorb®
- Packaging:
- Tape & Box (TB)
- Product Status:
- Active
- 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):
- 40A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 1.5KE
1N6281A-E3/73 FAQ
1.How can I place an order for 1N6281A-E3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6281A-E3/73 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-E3/73 reliable?
The price and inventory of 1N6281A-E3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6281A-E3/73 is usually 5 days.
3.What payment methods are accepted for 1N6281A-E3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6281A-E3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6281A-E3/73?
1N6281A-E3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6281A-E3/73 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-E3/73?
For technical support, including 1N6281A-E3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6281A-E3/73 requirements.
6.How does Aetrix verify that 1N6281A-E3/73 is sourced from the original manufacturer or authorized distributors?
All 1N6281A-E3/73 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-E3/73 meets industry standards.
7.What is the process for return or replacement of 1N6281A-E3/73?
All 1N6281A-E3/73 units undergo pre-shipment inspection (PSI). If there is an issue with 1N6281A-E3/73, 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-E3/73 part is unused and in its original packaging.
Return procedure for 1N6281A-E3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N6281A-E3/73 Tags
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