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Vishay General Semiconductor - Diodes Division SMCJ28A-M3/9AT
- Part No.:
- SMCJ28A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ28A-M3/9AT.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,678
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Product details
Overview
SMCJ28A-M3/9AT from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, featuring 28 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR) at 1 mA, 45.4 V maximum clamping voltage (VC) at 33.0 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 μs waveform - deployed for overvoltage protection of DC power rails and signal lines in automotive ECUs and industrial motor drives.
For engineers reviewing the SMCJ28A-M3/9AT datasheet, SMCJ28A-M3/9AT pinout, SMCJ28A-M3/9AT application, or SMCJ28A-M3/9AT equivalent, this part delivers verified AEC-Q101 qualification (via HM3 suffix), halogen-free RoHS compliance, MSL Level 1 moisture sensitivity, and low incremental surge resistance - critical for high-reliability 12 V/24 V system designs requiring robust ESD and load-dump immunity.
Technical Context
The SMCJ28A-M3/9AT operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its specified VBR range (31.1–34.4 V), clamping transients to ≤45.4 V at 33.0 A. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns), while the SMC package enables automated placement and thermal dissipation via copper pad mounting.
Designed for single-polarity DC protection, it exhibits 1.0 μA max reverse leakage at 28 V (VWM), 0.098 %/°C temperature coefficient of VBR, and 75 °C/W junction-to-ambient thermal resistance - enabling reliable operation up to +150 °C junction temperature under pulsed surge conditions per IEC 61000-4-5 and ISO 7637-2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 31.1 V / 34.4 V at 1 mA - guaranteed avalanche onset range defining turn-on threshold |
| VC @ IPPM | 45.4 V at 33.0 A - clamped voltage during 10/1000 μs surge, limiting stress on downstream ICs |
| PPPM | 1500 W - peak transient power handling capability under standardized surge waveform |
| ID @ VWM | ≤1.0 μA - ultra-low leakage preserves efficiency in always-on 24 V supply monitoring circuits |
| TJ max. | +150 °C - enables use in under-hood automotive environments without derating |
| Package | SMC (DO-214AB) - industry-standard 2-pin surface-mount outline with 8.0 mm × 8.0 mm copper pad thermal path |
Pinout & Package
SMCJ28A-M3/9AT uses the standard SMC (DO-214AB) package: molded plastic body with matte tin-plated leads, cathode indicated by a band on the case. Mounting requires 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal for rated power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when VREV > VBR |
| Anode | Reference/return path | Typically tied to system ground or low-impedance return plane for effective clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces |
| Halogen-free & RoHS-compliant | M3 suffix confirms full compliance with environmental regulations and JESD201 Class 2 whisker resistance |
| Low incremental surge resistance | Enables tighter clamping (45.4 V) at high surge currents, reducing voltage overshoot on protected nodes |
| MSL Level 1 rating | Allows unlimited floor life and reflow soldering at 260 °C peak without preconditioning |
| Glass passivated junction | Ensures long-term stability of VBR and leakage performance across temperature and lifetime |
Applications
| Automotive Power Rail Protection | Industrial Motor Drive Control |
|---|---|
Use Scenario: Protecting 24 V battery-supplied microcontroller inputs and CAN transceiver power pins against load dump and jump-start surges per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between power rail and ground, activated within <1 ns upon overvoltage detection. Use Value: Limits transient voltage to ≤45.4 V, preventing latch-up or permanent damage to 3.3 V/5 V logic circuitry downstream. | Use Scenario: Safeguarding gate drivers and current-sense amplifiers in 3-phase inverter stages exposed to inductive switching spikes. IC Role / Device Role / Timing Role: Fast-response transient suppressor across DC bus rails and isolated signal paths, absorbing energy from MOSFET/FET turn-off events. Use Value: Withstands 1500 W peak pulses and maintains <1.0 μA leakage at 28 V, preserving accuracy of precision analog feedback loops. |
| Telecom DC Power Interface | Consumer Appliance Mainboard |
Use Scenario: Shielding PoE-powered Ethernet PHYs and management controllers from lightning-induced surges on 48 V DC input lines. IC Role / Device Role / Timing Role: Primary overvoltage clamp on secondary-side DC distribution, coordinated with upstream GDT or MOV stages. Use Value: 0.098 %/°C VBR tempco ensures consistent clamping behavior across -40 °C to +85 °C ambient telecom cabinet environments. | Use Scenario: Securing MCU reset lines and USB interface power in white goods (refrigerators, washing machines) subject to ESD and mains coupling. IC Role / Device Role / Timing Role: Low-leakage unidirectional suppressor on 3.3 V/5 V rails, placed adjacent to connectors and reset ICs. Use Value: Halogen-free M3 construction meets global safety standards for enclosed consumer enclosures without compromising surge immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A-M3/8A | Lower PPPM (400 W), smaller SMA package, same VWM/VBR/VC specs | Not suitable for 1500 W surge events; limited to lower-energy transients | Select when board space is constrained and surge threat level is reduced (e.g., secondary-side signal lines) |
| SMCJ28CA-M3/9AT | Bidirectional variant; identical VWM/VBR/VC but symmetric conduction in both polarities | Required for AC-coupled or floating signal lines where polarity reversal occurs | Choose only if protecting bidirectional data lines (e.g., RS-485, CAN FD) or AC inputs |
Compared with SMAJ28A-M3/8A and SMCJ28CA-M3/9AT, the SMCJ28A-M3/9AT uniquely balances 1500 W surge capacity, automotive qualification, and unidirectional DC rail compatibility - making it the optimal choice for primary-side 24 V power protection where high-energy transients and reliability are non-negotiable.
Availability
SMCJ28A-M3/9AT is available at Aetrix Electronics and suitable for automotive electronic control units, industrial motor drives, and telecom power interfaces requiring stable component supply, long-term lifecycle support, and traceable halogen-free sourcing.
Supply support for SMCJ28A-M3/9AT 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific validation.
The SMCJ series is engineered for high-power transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where immunity to ISO 7637-2, IEC 61000-4-5, and AEC-Q101 stress profiles is mandatory.
FAQ
What is the clamping voltage of SMCJ28A-M3/9AT at its rated peak pulse current?
The SMCJ28A-M3/9AT has a maximum clamping voltage (VC) of 45.4 V at its rated peak pulse current (IPPM) of 33.0 A, measured under the standard 10/1000 μs double-exponential surge waveform. This value is guaranteed across manufacturing lots and validated per Vishay's qualification testing, ensuring predictable protection margin for 24 V systems. The SMCJ28A-M3/9AT maintains this clamping performance up to +150 °C junction temperature.
Is SMCJ28A-M3/9AT qualified for automotive applications?
Yes, the SMCJ28A-M3/9AT carries the M3 suffix indicating halogen-free, RoHS-compliant construction and is AEC-Q101 qualified when ordered with HM3 suffix variants (e.g., SMCJ28A-HM3/9AT). While the base SMCJ28A-M3/9AT shares the same die and package as qualified versions, full AEC-Q101 certification applies specifically to HM3-marked parts. For automotive-grade deployment, specify SMCJ28A-HM3/9AT to ensure documented qualification evidence.
What is the reverse leakage current of SMCJ28A-M3/9AT at its stand-off voltage?
The SMCJ28A-M3/9AT exhibits a maximum reverse leakage current (ID) of 1.0 μA at its stand-off voltage (VWM) of 28 V, measured at 25 °C ambient. This ultra-low leakage supports energy-sensitive applications such as always-on monitoring circuits and battery-backed systems. Leakage remains below 5.0 μA up to +125 °C, preserving system efficiency across extended temperature ranges.
Does SMCJ28A-M3/9AT have a defined polarity marking, and how is it identified?
Yes, the SMCJ28A-M3/9AT is a unidirectional TVS diode with explicit polarity: the cathode is marked by a visible band on the SMC (DO-214AB) package body. This band must be oriented toward the side of the circuit to be protected (e.g., connected to the 24 V rail), while the anode connects to ground. Incorrect orientation renders the device non-functional for reverse-transient suppression, so PCB silkscreen and assembly documentation must reflect this band-to-rail convention.
What thermal resistance does SMCJ28A-M3/9AT exhibit, and how does it affect layout design?
The SMCJ28A-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. To sustain repeated 1500 W surges without exceeding +150 °C junction temperature, designers must allocate adequate copper area and avoid thermal bottlenecks in ground planes. The SMCJ28A-M3/9AT also features RθJL = 15 °C/W, confirming efficient heat transfer to PCB leads when properly soldered.
SMCJ28A-M3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 33A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ28A-M3/9AT FAQ
1.How can I place an order for SMCJ28A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ28A-M3/9AT 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 SMCJ28A-M3/9AT reliable?
The price and inventory of SMCJ28A-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ28A-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ28A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ28A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ28A-M3/9AT?
SMCJ28A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ28A-M3/9AT 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 SMCJ28A-M3/9AT?
For technical support, including SMCJ28A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ28A-M3/9AT requirements.
6.How does Aetrix verify that SMCJ28A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ28A-M3/9AT 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 SMCJ28A-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ28A-M3/9AT?
All SMCJ28A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ28A-M3/9AT, 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 SMCJ28A-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ28A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ28A-M3/9AT Tags
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