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onsemi SMCJ28CA
- Part No.:
- SMCJ28CA
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ28CA.pdf
- Description:
- SMCJ28 - TRANS VOLTAGE SUPPRESSO
- Quantity:
- Payment:
- Shipping:
Inventory:42,155
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Product details
Overview
SMCJ28CA from Fairchild Semiconductor is a bidirectional transient voltage suppressor (TVS) diode designed for high-energy surge protection in DC power lines and signal interfaces. It features a 28 V reverse stand-off voltage (VRWM), 31.1–34.4 V breakdown voltage (VBR), 45.4 V clamping voltage (VC) at 33.0 A peak pulse current, and 1500 W peak pulse power on 10/1000 μs waveform - deployed in industrial motor drives to protect IGBT gate drivers from inductive switching transients.
For engineers reviewing the SMCJ28CA datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional clamping symmetry, low incremental surge resistance, sub-5 ns response time, IR < 5 μA at VRWM, and DO-214AB package compatibility with automated PCB assembly.
Technical Context
The SMCJ28CA operates as a silicon avalanche diode with glass-passivated junction, enabling robust ESD and lightning surge immunity without degradation under repeated 10/1000 μs transients. Its bidirectional structure eliminates polarity sensitivity, supporting AC-coupled or floating bus protection where voltage reversals occur.
Clamping begins at 31.1 V minimum breakdown and stabilizes at 45.4 V under 33.0 A peak pulse current, delivering predictable overvoltage limiting with low dynamic impedance. The device maintains ≤5 μA reverse leakage at 28 V and operates up to 150°C junction temperature, suitable for under-hood or enclosed industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500 W on 10/1000 μs waveform - sustains single-event surges up to IEC 61000-4-5 Level 4 (4 kV, 2 Ω source) |
| Reverse Stand-Off Voltage | 28 V - maximum continuous DC or RMS AC voltage before significant leakage or clamping onset |
| Breakdown Voltage | 31.1–34.4 V at 1 mA - defines reliable avalanche initiation threshold with tight 10.7% tolerance |
| Clamping Voltage | 45.4 V at 33.0 A IPPM - limits protected circuit voltage during worst-case surge, enabling 15 V logic-safe margin |
| Response Time | <5.0 ns - ensures clamping activation before transient energy couples into sensitive downstream ICs |
| Reverse Leakage | <5 μA at 28 V - minimizes standby power loss and avoids false triggering in high-impedance bias networks |
Pinout & Package
SMCJ28CA uses the DO-214AB (SMC) surface-mount package: molded plastic body, 2-leaded, cathode band omitted (bidirectional configuration), footprint compatible with IPC-7351B SMC standard, thermal pad not required, JEDEC-compliant for reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction terminals | No polarity marking; either terminal serves as anode or cathode depending on instantaneous voltage polarity - enables single-device AC protection |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Eliminates surface contamination sensitivity and ensures stable VBR over 10+ years in humid industrial environments |
| 1500 W peak pulse rating | Supports EN 61000-4-5 4 kV surge testing without derating or parallel devices |
| Low incremental surge resistance | Reduces VC overshoot during fast-rising transients (<100 ns rise time), improving protection margin for 3.3 V/5 V microcontrollers |
| UL94V-0 flammability rating | Meets mandatory safety compliance for enclosed power supplies and industrial control cabinets |
Applications
| Industrial Motor Drives | Telecom Power Feeds |
|---|---|
Use Scenario: Protecting gate driver ICs and isolated feedback circuits from flyback voltage spikes generated by IGBT turn-off in 48 V DC bus inverters. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed across gate-to-source path, activated within 5 ns of overvoltage event. Use Value: Limits gate voltage to ≤45.4 V, preventing oxide rupture in 600 V IGBTs while maintaining <5 μA leakage during normal operation. | Use Scenario: Safeguarding -48 V telecom rectifier outputs and PSE controllers against lightning-induced common-mode surges on twisted-pair feeds. IC Role / Device Role / Timing Role: Primary surge shunt on DC output rail, operating symmetrically for both positive and negative polarity transients. Use Value: Clamps 10/1000 μs surges up to 33 A without degradation, preserving ±5% output regulation during field-deployed surge events. |
| Automotive Body Control Modules | Renewable Energy Charge Controllers |
Use Scenario: Suppressing load-dump transients (ISO 7637-2 Pulse 5a) on 12 V battery-supplied LIN/CAN node power rails. IC Role / Device Role / Timing Role: Secondary-level TVS placed after primary fuse and LC filter, clamping residual spikes exceeding 28 V. Use Value: Withstands 1500 W pulses while maintaining <5 μA leakage at 12 V nominal, avoiding battery drain in sleep mode. | Use Scenario: Protecting MPPT controller inputs from induced surges on PV string wiring exposed to outdoor lightning activity. IC Role / Device Role / Timing Role: DC-side transient clamp on ungrounded bipolar PV input (±600 V max), leveraging bidirectional symmetry. Use Value: Provides matched clamping in both polarities up to 45.4 V, enabling single-device protection without polarity-aware layout constraints. |
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 (ON Semiconductor) | Same VRWM/VBR/VC specs but 600 W rating (SMB package); 50% lower peak pulse power | Suitable only for lower-energy surges (IEC 61000-4-5 Level 2); requires parallel devices for 1500 W duty | Select when board space is constrained and surge threat level is limited to 2 kV |
| 1.5KE28CA (Littelfuse) | Same 28 V rating and bidirectional function but through-hole DO-201 package; identical 1500 W rating | Requires wave soldering or hand assembly; incompatible with fully SMT production lines | Select when legacy through-hole design or manual repairability is prioritized over automation |
Compared with SMBJ28CA and 1.5KE28CA, the SMCJ28CA uniquely delivers 1500 W surge handling in a surface-mount DO-214AB package - enabling full automation, higher power density, and direct replacement of older axial-leaded TVS diodes without PCB redesign.
Availability
SMCJ28CA is available at Aetrix Electronics and suitable for industrial motor drives, telecom power feeds, automotive body control modules, and renewable energy charge controllers requiring stable component supply across multi-year production cycles.
Supply support for SMCJ28CA 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016; its legacy TVS portfolio remains widely deployed in industrial and telecom infrastructure.
The SMCJ series was engineered specifically for high-reliability DC bus and interface line protection, targeting applications demanding >1000 W surge capability in compact SMT packages without sacrificing clamping precision or long-term stability.
FAQ
What is the clamping voltage of the SMCJ28CA under maximum rated surge current?
The SMCJ28CA clamps to 45.4 V when subjected to its peak pulse current of 33.0 A on a 10/1000 μs waveform. This value is measured per JEDEC standards and guarantees consistent overvoltage limiting across production lots, enabling reliable design margin calculation for downstream 3.3 V or 5 V logic interfaces protected by the SMCJ28CA.
Is the SMCJ28CA unidirectional or bidirectional, and how is polarity identified?
The SMCJ28CA is a bidirectional TVS diode, indicated by the "CA" suffix per Fairchild's naming convention. It has no cathode band marking - unlike unidirectional variants - because both terminals behave identically under positive or negative overvoltage conditions. This symmetry allows the SMCJ28CA to protect AC-coupled or floating nodes without orientation concerns during placement.
What package type does the SMCJ28CA use, and is it RoHS compliant?
The SMCJ28CA uses the DO-214AB (SMC) surface-mount package, standardized under JEDEC, with dimensions of 7.11 mm × 6.22 mm × 2.34 mm. Per Fairchild's Rev. 5.7 datasheet and compliance documentation, the SMCJ28CA is RoHS compliant and halogen-free, meeting lead-free reflow requirements up to 260°C peak temperature without delamination or parametric shift.
How does the SMCJ28CA compare to the SMCJ28A in terms of electrical performance?
The SMCJ28CA is the bidirectional version, while SMCJ28A is unidirectional. Their VRWM (28 V), VBR (31.1–34.4 V), and VC (45.4 V) match, but the SMCJ28A includes a visible cathode band and conducts only in reverse - making it unsuitable for AC or polarity-agnostic protection. The SMCJ28CA must be selected when surge polarity is unpredictable, such as in Ethernet PHY interfaces or transformer-coupled power rails.
What is the maximum operating junction temperature for the SMCJ28CA, and how does it affect derating?
The SMCJ28CA has a maximum operating junction temperature of 150°C. Its peak pulse power must be linearly derated above 25°C ambient: at 100°C ambient, only ~65% of the 1500 W rating remains usable. Designers must verify PCB copper area, airflow, and adjacent heat sources to ensure the SMCJ28CA stays within this limit during sustained surge events or high-temperature operation.
SMCJ28CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ
- Packaging:
- Bulk
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ28CA FAQ
1.How can I place an order for SMCJ28CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ28CA 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 reliable?
The price and inventory of SMCJ28CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ28CA is usually 5 days.
3.What payment methods are accepted for SMCJ28CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ28CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ28CA?
SMCJ28CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ28CA 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?
For technical support, including SMCJ28CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ28CA requirements.
6.How does Aetrix verify that SMCJ28CA is sourced from the original manufacturer or authorized distributors?
All SMCJ28CA 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 meets industry standards.
7.What is the process for return or replacement of SMCJ28CA?
All SMCJ28CA units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ28CA, 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 part is unused and in its original packaging.
Return procedure for SMCJ28CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ28CA Tags
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onsemi
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Nexperia USA Inc.
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