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Vishay General Semiconductor - Diodes Division SMCJ28CA-M3/9AT
- Part No.:
- SMCJ28CA-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ28CA-M3/9AT.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,499
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Product details
Overview
SMCJ28CA-M3/9AT from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients up to 1500 W peak pulse power with 45.4 V maximum clamping voltage at 33.0 A peak pulse current and 28 V stand-off voltage. It protects MOSFETs, ICs, and sensor signal lines in automotive and industrial power electronics.
For engineers reviewing the SMCJ28CA-M3/9AT datasheet, SMCJ28CA-M3/9AT pinout, SMCJ28CA-M3/9AT application, or SMCJ28CA-M3/9AT equivalent, key selection criteria include bidirectional clamping capability, 1500 W PPPM rating, 28 V VWM, -55 °C to +150 °C operating temperature range, and halogen-free RoHS-compliant M3 suffix construction.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional CA configuration, enabling protection of AC-coupled or differential signal paths without polarity concerns. Its glass-passivated junction ensures stable breakdown behavior and low incremental surge resistance under repetitive transient stress.
Designed for mounting on 8.0 mm × 8.0 mm copper pads per terminal, it delivers 1500 W peak pulse power with a 10/1000 μs waveform while maintaining thermal resistance of 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-lead), supporting reliable operation in high-density PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 31.1 V / 34.4 V - Breakdown occurs within this range at 1.0 mA test current |
| VC @ IPPM | 45.4 V - Clamped voltage seen by protected circuit during full 33.0 A surge |
| PPPM | 1500 W - Peak transient energy absorption capability with 10/1000 μs waveform |
| TJ max | +150 °C - Maximum junction temperature enabling use in under-hood automotive environments |
| Package | SMC (DO-214AB) - Surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height |
| Compliance | Halogen-free, RoHS-compliant (M3 suffix), MSL Level 1, JESD201 Class 2 whisker resistant |
Pinout & Package
SMCJ28CA-M3/9AT uses the standard SMC (DO-214AB) package: two-terminal, non-polarized bidirectional device with no cathode/anode marking. Terminals are matte tin-plated leads solderable per J-STD-002 and JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Either terminal serves as anode or cathode depending on transient polarity; no functional distinction |
| Terminal 2 | Anode/Cathode (bidirectional) | Electrically identical to Terminal 1; symmetrical conduction path for ± transients |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses, or ungrounded circuits without polarity constraints |
| 1500 W peak pulse power | Withstands high-energy transients such as ISO 7637-2 Pulse 5a (load dump) in 12 V automotive systems |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage stress on downstream components during surge events |
| MSL Level 1 rating | Supports lead-free reflow without moisture-induced popcorn failure, eliminating bake requirements |
| Halogen-free M3 construction | Meets environmental compliance mandates for industrial and automotive OEM supply chains |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Lines |
|---|---|
Use Scenario: Protection of 12 V battery-fed ECUs against load dump and jump-start transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed across power rail inputs to clamp surges before they reach DC-DC converters and microcontrollers. Use Value: Withstands 1500 W pulses while limiting voltage to ≤45.4 V, preventing latch-up or gate oxide damage in downstream silicon. | Use Scenario: Shielding analog outputs of pressure/temperature sensors from ESD and inductive switching noise. IC Role / Device Role / Timing Role: Low-capacitance TVS connected between signal line and ground to suppress fast transients without distorting millivolt-level signals. Use Value: 33.0 A peak pulse handling and 45.4 V clamping ensure sensor accuracy remains intact during 8 kV contact ESD events. |
| Telecom Line Interface | Consumer USB Port Protection |
Use Scenario: Safeguarding RS-485 transceivers on outdoor telecom nodes exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional TVS installed differentially across A/B bus lines to absorb common-mode and differential-mode transients. Use Value: Symmetrical 31.1–34.4 V breakdown enables balanced clamping, preserving signal integrity during 10/1000 μs surges up to 1500 W. | Use Scenario: Adding robustness to USB 2.0 data lines in portable devices subject to user-handling ESD. IC Role / Device Role / Timing Role: TVS mounted on D+ and D− lines to shunt ESD current away from PHY transceivers. Use Value: Fast response time and 45.4 V clamping prevent data corruption and PHY latch-up during ±15 kV air discharge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC28CA | Lower PPPM (1000 W), same VWM (28 V), smaller SMA package (DO-214AC) | Reduced surge margin; suitable only for lower-energy threats like IEC 61000-4-2 ESD | Select when board space is constrained and 1500 W rating is not required |
| SMCJ28A-M3/9AT | Unidirectional version; same VWM, VC, and PPPM but asymmetric conduction | Requires correct polarity placement; unsuitable for AC or floating signal paths | Choose only if system ground reference is fixed and polarity is guaranteed |
Compared with SAC28CA and SMCJ28A-M3/9AT, the SMCJ28CA-M3/9AT uniquely provides bidirectional 1500 W surge protection in the industry-standard SMC footprint-enabling drop-in replacement in automotive and industrial designs where polarity-agnostic clamping is mandatory.
Availability
SMCJ28CA-M3/9AT is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface, telecom line protection, and consumer USB port hardening requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ28CA-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 compliance.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform engineered specifically for high-energy transient suppression in harsh environments including automotive, industrial, and telecom infrastructure.
FAQ
What does the "CA" suffix indicate in SMCJ28CA-M3/9AT?
The "CA" suffix denotes a bidirectional configuration, meaning the SMCJ28CA-M3/9AT conducts and clamps voltage transients equally in both directions. This eliminates polarity concerns during placement and makes it ideal for protecting AC-coupled circuits, differential buses, or ungrounded signal paths where voltage polarity may reverse.
What is the maximum clamping voltage of SMCJ28CA-M3/9AT and under what conditions is it specified?
The SMCJ28CA-M3/9AT has a maximum clamping voltage (VC) of 45.4 V, measured at its peak pulse current (IPPM) of 33.0 A using a standardized 10/1000 μs double-exponential surge waveform. This value represents the highest voltage the protected circuit will experience during a full-rated transient event.
Is SMCJ28CA-M3/9AT suitable for automotive applications?
Yes, SMCJ28CA-M3/9AT is qualified to AEC-Q101 when ordered with HE3 or HM3 suffixes; however, the M3/9AT variant is commercial-grade with identical electrical specs and mechanical robustness. Its -55 °C to +150 °C operating range, 1500 W surge rating, and halogen-free construction make it widely deployed in automotive body control modules and infotainment power supplies.
How does the SMCJ28CA-M3/9AT differ from the unidirectional SMCJ28A-M3/9AT?
The SMCJ28CA-M3/9AT is bidirectional with symmetrical breakdown and clamping behavior, while the SMCJ28A-M3/9AT is unidirectional and conducts only when the cathode is positive relative to the anode. The CA version requires no polarity marking or orientation check during assembly, simplifying layout and reducing risk of misplacement in the SMCJ28CA-M3/9AT design.
What is the thermal resistance profile of SMCJ28CA-M3/9AT and how does it affect PCB layout?
The SMCJ28CA-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead (RθJL) of 15 °C/W. To maintain safe operation under repeated surges, Vishay specifies mounting on minimum 8.0 mm × 8.0 mm copper pads per terminal-ensuring adequate heat spreading and avoiding thermal runaway during high-duty-cycle transient events.
SMCJ28CA-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:
- -
- Bidirectional Channels:
- 1
- 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)
SMCJ28CA-M3/9AT FAQ
1.How can I place an order for SMCJ28CA-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ28CA-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 SMCJ28CA-M3/9AT reliable?
The price and inventory of SMCJ28CA-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 SMCJ28CA-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ28CA-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ28CA-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ28CA-M3/9AT?
SMCJ28CA-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ28CA-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 SMCJ28CA-M3/9AT?
For technical support, including SMCJ28CA-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ28CA-M3/9AT requirements.
6.How does Aetrix verify that SMCJ28CA-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ28CA-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 SMCJ28CA-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ28CA-M3/9AT?
All SMCJ28CA-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ28CA-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 SMCJ28CA-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ28CA-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ28CA-M3/9AT Tags
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