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Vishay General Semiconductor - Diodes Division SMCJ28CA/57T
- Part No.:
- SMCJ28CA/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ28CA/57T.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,344
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Product details
Overview
SMCJ28CA/57T from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package, designed for clamping voltage transients on signal or power lines. It features a 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 - used in automotive sensor protection and industrial I/O interface surge suppression.
For engineers reviewing the SMCJ28CA/57T datasheet, SMCJ28CA/57T pinout, SMCJ28CA/57T application, or SMCJ28CA/57T equivalent, key selection criteria include bi-directional clamping capability, AEC-Q101 qualification, 1500 W surge rating, DO-214AB thermal performance (RθJA = 75 °C/W), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ28CA/57T operates as a bi-directional avalanche diode, symmetrically clamping both positive and negative transients without polarity marking. Its glass-passivated junction enables fast response time (<1 ns), low incremental surge resistance, and stable breakdown under repetitive surge stress per IEC 61000-4-5.
Designed for surface-mount use on PCBs with minimum 0.31" × 0.31" copper pads per terminal, it delivers 1500 W peak pulse power at TA = 25 °C and derates linearly above 25 °C per Fig. 2, maintaining operation across -55 °C to +150 °C junction temperature range.
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 IT = 1 mA - ensures reliable avalanche initiation within tight tolerance band |
| VC @ IPPM | 45.4 V at 33.0 A - limits downstream circuit voltage during 10/1000 µs surge event |
| PPPM | 1500 W - handles high-energy transients from inductive switching or ESD coupling |
| TJ max | +150 °C - supports under-hood automotive and industrial ambient environments |
| Package | DO-214AB (SMCJ) - standardized SMT outline with 75 °C/W junction-to-ambient thermal resistance |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling and HTRB |
Pinout & Package
SMCJ28CA/57T uses the DO-214AB (SMCJ) surface-mount package with two terminals: anode and cathode. As a bi-directional device, it has no polarity marking and functions identically in either orientation. The package features matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (positive half-cycle) | Conducts during positive overvoltage events; tied to protected line or ground return path |
| Cathode | Transient current entry (negative half-cycle) | Conducts during negative overvoltage events; symmetric conduction enables bidirectional clamping |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| AEC-Q101 qualification | Validated for automotive applications including engine control units and ADAS sensor interfaces |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a/5a) |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow profiles without moisture-related delamination risk |
| Glass passivated junction | Ensures long-term stability of breakdown voltage and leakage current under thermal cycling |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and inductive kickback in vehicle ECUs. IC Role / Device Role / Timing Role: Voltage clamping element placed between signal line and ground, responding within <1 ns to limit transient amplitude. Use Value: Prevents damage to sensitive 3.3 V or 5 V interface ICs by clamping surges to ≤45.4 V while dissipating up to 1500 W peak power. | Use Scenario: Shielding digital input modules in programmable logic controllers from field-wiring induced transients (e.g., relay coil de-energization). IC Role / Device Role / Timing Role: Bi-directional shunt protector on 24 V DC input channels, absorbing energy from ±1 kV/50 Ω surge waveforms. Use Value: Maintains functional integrity of optocoupler input stages by limiting voltage excursion below 45.4 V during 10/1000 µs surges. |
| Telecom Line Interface | Consumer Power Adapter ESD Protection |
Use Scenario: Safeguarding Ethernet PHY front-end circuits and RS-485 transceivers against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary-level TVS placed at connector entry point, clamping common-mode transients before differential receivers. Use Value: Withstands repeated 1500 W surges while holding clamping voltage low enough to avoid latch-up in 3.3 V transceivers. | Use Scenario: Adding secondary-side surge immunity to USB-C PD adapters and AC/DC wall adapters exposed to user-handling ESD. IC Role / Device Role / Timing Role: Bi-directional clamp on 5 V/9 V/15 V output rails, suppressing contact discharge events per IEC 61000-4-2 Level 4. Use Value: Provides robust 1500 W surge handling without requiring series impedance, enabling compact layout near output connectors. |
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 | Lower PPPM (600 W), same VWM/VBR/VC, SMB package (smaller footprint, higher RθJA) | Suitable for lower-energy transients; not recommended for automotive load dump where 1500 W is required | Select SMCJ28CA/57T when full 1500 W surge capacity and AEC-Q101 qualification are mandatory |
| 1.5KE28CA | Through-hole TO-218 package, same electrical specs but higher mounting inductance and manual assembly requirement | Used in legacy industrial power supplies where SMT is not feasible; lacks MSL-1 reflow compatibility | Choose SMCJ28CA/57T for automated SMT production, space-constrained boards, and automotive qualification needs |
Compared with SMBJ28CA and 1.5KE28CA, the SMCJ28CA/57T uniquely combines 1500 W surge rating, AEC-Q101 qualification, DO-214AB SMT compatibility, and bi-directional symmetry - making it the preferred choice for next-generation automotive and industrial edge devices requiring high-reliability transient suppression.
Availability
SMCJ28CA/57T is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line protection requiring stable component supply, AEC-Q101 compliance, and 1500 W transient handling capability.
Supply support for SMCJ28CA/57T 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 optimization.
The SMCJ series was developed to deliver high-power transient suppression in compact surface-mount packages for automotive, industrial, and communications systems demanding AEC-Q101 qualification and robust surge immunity.
FAQ
What is the clamping voltage of SMCJ28CA/57T and how is it measured?
The SMCJ28CA/57T has a maximum clamping voltage (VC) of 45.4 V, measured at its rated peak pulse current (IPPM) of 33.0 A using a 10/1000 µs double-exponential surge waveform. This value is guaranteed per the Vishay datasheet (Document Number: 88394) and reflects the voltage seen across the device during worst-case transient events, ensuring downstream circuitry remains within safe operating limits. The SMCJ28CA/57T achieves this clamping performance through controlled avalanche breakdown in both directions.
Is SMCJ28CA/57T suitable for automotive applications?
Yes, the SMCJ28CA/57T is AEC-Q101 qualified and explicitly rated for automotive use, including engine control units, body electronics, and ADAS sensor interfaces. Its DO-214AB package meets MSL Level 1, its junction temperature range spans -55 °C to +150 °C, and its 1500 W surge rating satisfies ISO 7637-2 load dump requirements. The SMCJ28CA/57T is listed in Vishay's AEC-Q101 qualified product portfolio with full test documentation.
Does SMCJ28CA/57T have polarity markings?
No, the SMCJ28CA/57T is a bi-directional TVS diode and carries no polarity marking on its DO-214AB package. Unlike uni-directional variants (e.g., SMCJ28A), the CA suffix indicates symmetrical clamping behavior in both forward and reverse directions - allowing installation in either orientation without affecting performance. This simplifies PCB layout and eliminates orientation errors during automated placement.
What is the thermal resistance of SMCJ28CA/57T and how does it affect PCB layout?
The SMCJ28CA/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. This value assumes minimum recommended pad layout per Vishay's mechanical drawings. To maintain safe junction temperatures during repeated surges, designers must allocate sufficient copper area and avoid excessive trace length - the SMCJ28CA/57T relies on these pads for heat dissipation, not internal heatsinking.
How does SMCJ28CA/57T compare to SMCJ28A in terms of electrical behavior?
The SMCJ28CA/57T is bi-directional with identical VBR (31.1–34.4 V), VWM (28 V), and VC (45.4 V) specifications as the uni-directional SMCJ28A, but differs in polarity handling: SMCJ28A has a cathode band and conducts only in reverse bias, while SMCJ28CA/57T clamps symmetrically in both polarities. Both share the same 1500 W PPPM rating and DO-214AB package, but SMCJ28CA/57T is preferred for AC-coupled or floating signal lines where polarity is undefined.
SMCJ28CA/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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/57T FAQ
1.How can I place an order for SMCJ28CA/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ28CA/57T 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/57T reliable?
The price and inventory of SMCJ28CA/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ28CA/57T is usually 5 days.
3.What payment methods are accepted for SMCJ28CA/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ28CA/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ28CA/57T?
SMCJ28CA/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ28CA/57T 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/57T?
For technical support, including SMCJ28CA/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ28CA/57T requirements.
6.How does Aetrix verify that SMCJ28CA/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ28CA/57T 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/57T meets industry standards.
7.What is the process for return or replacement of SMCJ28CA/57T?
All SMCJ28CA/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ28CA/57T, 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/57T part is unused and in its original packaging.
Return procedure for SMCJ28CA/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ28CA/57T Tags
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