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Vishay General Semiconductor - Diodes Division SMCJ28CA-E3/9AT
- Part No.:
- SMCJ28CA-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ28CA-E3/9AT.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:249
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Product details
Overview
SMCJ28CA-E3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 28 V stand-off voltage (VWM), 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 across automotive sensor lines, industrial I/O ports, and telecom interface circuits.
For engineers reviewing the SMCJ28CA-E3/9AT datasheet, SMCJ28CA-E3/9AT pinout, SMCJ28CA-E3/9AT application, or SMCJ28CA-E3/9AT equivalent, key selection criteria include bidirectional clamping symmetry, low incremental surge resistance, AEC-Q101 qualification eligibility (via HE3 suffix variants), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within picoseconds to transients induced by inductive load switching or ESD events. Its glass-passivated junction ensures stable breakdown behavior, while bidirectional symmetry enables protection on AC-coupled or floating signal paths without polarity concerns.
The device complies with ANSI/IEEE C62.35 for surge suppression and meets J-STD-020 MSL Level 1 (260 °C peak reflow), supporting lead-free assembly. Thermal resistance is 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-lead), enabling reliable operation up to +150 °C junction temperature under defined PCB layout conditions.
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 at 1.0 mA - verified breakdown threshold ensuring precise turn-on margin above VWM |
| VC @ IPPM | 45.4 V at 33.0 A - clamping voltage limits downstream IC stress during 10/1000 μs surge |
| PPPM | 1500 W - peak transient energy handling capacity under standardized waveform |
| ID @ VWM | 1.0 μA - ultra-low leakage preserves signal integrity in high-impedance circuits |
| TJ max. | +150 °C - extended thermal range supports under-hood automotive and industrial environments |
| Package | SMC (DO-214AB) - surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height |
Pinout & Package
SMCJ28CA-E3/9AT uses the standard SMC (DO-214AB) two-terminal package. As a bidirectional TVS, it has no polarity marking; both terminals are functionally identical and interchangeable in circuit layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode | Common terminal pair | Identical bidirectional conduction path - no cathode band; symmetric clamping in either direction |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures consistent VBR tolerance and long-term stability under repeated surge stress |
| Low incremental surge resistance | Minimizes VC rise under high IPPM, improving protection margin for 3.3 V/5 V logic interfaces |
| MSL Level 1 rating | Enables single-reflow assembly without moisture sensitivity concerns or baking requirements |
| Matte tin plated leads | Guarantees solderability per J-STD-002 and JESD 22-B102, compatible with Pb-free and SnPb processes |
| UL 94 V-0 molding compound | Meets flammability safety standards for enclosed industrial and automotive enclosures |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt clamping element placed directly at connector entry point to divert surge energy before reaching signal conditioning ICs. Use Value: 45.4 V clamping holds microcontroller GPIOs and ADC inputs below absolute maximum ratings during 12 V system transients. | Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to relay coil flyback and motor drive noise. IC Role / Device Role / Timing Role: Parallel-connected transient absorber on 24 V DC input lines, coordinated with upstream fusing. Use Value: 1500 W PPPM rating sustains multiple 10/1000 μs surges without degradation, extending field service life. |
| Telecom Line Interface | Consumer Power Adapter Output |
Use Scenario: Secondary-side surge protection on Ethernet PHY magnetics or RS-485 transceiver lines in network equipment. IC Role / Device Role / Timing Role: Bidirectional clamp bridging differential pairs to suppress common-mode transients without disrupting DC bias. Use Value: Symmetrical VBR (31.1–34.4 V) ensures equal clamping in both directions, preserving signal integrity on full-duplex links. | Use Scenario: Output rail protection in wall-mounted AC/DC adapters supplying USB-C PD or smart home hubs. IC Role / Device Role / Timing Role: Final-stage TVS placed after DC-DC converter to absorb residual switching spikes and external ESD events. Use Value: 1.0 μA ID at 28 V minimizes standby power loss while maintaining fast response to 8 kV contact ESD per IEC 61000-4-2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28CA-E3/52T | Lower PPPM (600 W), smaller SMB (DO-214AA) package, same VWM/VC specs | Reduced surge handling; suitable only for lower-energy threat environments (e.g., consumer USB ports) | Select when board space is constrained and peak surge exposure is limited to IEC 61000-4-5 Level 2. |
| SMCJ28A-E3/9AT | Unidirectional variant with cathode band marking; identical VWM, VC, and PPPM | Requires correct polarity orientation; not usable on AC or floating nodes without series blocking diode | Choose only for DC-biased rails where polarity is fixed and reverse conduction must be blocked. |
Compared with SMCJ28CA-E3/9AT, SMBJ28CA-E3/52T trades surge capacity for compactness, while SMCJ28A-E3/9AT sacrifices bidirectional flexibility for unidirectional isolation - making the original the optimal choice for general-purpose, polarity-agnostic protection requiring full 1500 W capability.
Availability
SMCJ28CA-E3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line protection requiring stable component supply and traceable RoHS-compliant sourcing.
Supply support for SMCJ28CA-E3/9AT 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 and automotive-grade qualification.
The SMCJ series is engineered for high-energy transient suppression in harsh environments, targeting design-in across automotive, industrial control, and communications infrastructure where AEC-Q101 compliance and 1500 W surge immunity are critical.
FAQ
What is the clamping voltage of SMCJ28CA-E3/9AT at its rated peak pulse current?
The SMCJ28CA-E3/9AT has a maximum clamping voltage (VC) of 45.4 V when subjected to its rated 33.0 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured across the device terminals during surge testing and defines the upper voltage limit imposed on protected circuitry during transient events. The SMCJ28CA-E3/9AT maintains this clamping performance bidirectionally due to its symmetrical construction.
Is SMCJ28CA-E3/9AT suitable for automotive applications?
Yes, SMCJ28CA-E3/9AT is RoHS-compliant and manufactured to meet AEC-Q101 qualification requirements when ordered with the HE3 or HM3 suffix (e.g., SMCJ28CAHE3_A/I). While the E3/9AT variant itself is commercial-grade, its electrical characteristics, thermal performance (+150 °C TJ max), and mechanical robustness align with automotive subsystem needs - especially when used in conjunction with AEC-Q101-qualified variants in design-in phases. The SMCJ28CA-E3/9AT serves as the baseline for qualified versions.
How does the bidirectional nature of SMCJ28CA-E3/9AT affect its PCB layout?
The SMCJ28CA-E3/9AT has no polarity marking and functions identically in both directions, eliminating orientation constraints during PCB layout. Unlike unidirectional TVS diodes that require cathode alignment, this device can be placed without regard to terminal assignment - simplifying automated placement and reducing assembly errors. Its symmetric clamping ensures equal protection on AC-coupled lines, transformer-isolated interfaces, or floating sensor outputs. The SMCJ28CA-E3/9AT's DO-214AB footprint remains unchanged regardless of orientation.
What is the thermal resistance of SMCJ28CA-E3/9AT, and how does it impact power dissipation?
The SMCJ28CA-E3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead resistance (RθJL) of 15 °C/W, measured on the recommended 8.0 mm × 8.0 mm copper pad layout. These values define temperature rise under steady-state conditions: at 6.5 W continuous power dissipation (PD), junction temperature rises ~488 °C above ambient - which exceeds rating limits. Therefore, the SMCJ28CA-E3/9AT is intended for transient, not continuous, power handling; its 6.5 W PD rating applies only with proper heatsinking and derating above 25 °C ambient.
Does SMCJ28CA-E3/9AT require special handling or packaging considerations?
No special handling is required beyond standard ESD-safe practices. The SMCJ28CA-E3/9AT is supplied in 13-inch plastic tape and reel (9AT packaging code), rated MSL Level 1 per J-STD-020, meaning it may be mounted directly after removal from sealed packaging without baking. Its matte tin-plated leads comply with J-STD-002 and JESD 22-B102 for solderability, and the UL 94 V-0 molding compound eliminates flammability concerns. The SMCJ28CA-E3/9AT is fully compatible with lead-free reflow profiles up to 260 °C peak temperature.
SMCJ28CA-E3/9AT 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 (SMCJ)
SMCJ28CA-E3/9AT FAQ
1.How can I place an order for SMCJ28CA-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ28CA-E3/9AT 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-E3/9AT reliable?
The price and inventory of SMCJ28CA-E3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ28CA-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ28CA-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ28CA-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ28CA-E3/9AT?
SMCJ28CA-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ28CA-E3/9AT 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-E3/9AT?
For technical support, including SMCJ28CA-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ28CA-E3/9AT requirements.
6.How does Aetrix verify that SMCJ28CA-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ28CA-E3/9AT 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-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ28CA-E3/9AT?
All SMCJ28CA-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ28CA-E3/9AT, 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-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ28CA-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ28CA-E3/9AT Tags
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