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Alpha & Omega Semiconductor Inc. SMDJ12CA
- Part No.:
- SMDJ12CA
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ12CA.pdf
- Description:
- 1CH 12V BIDIRECTIONAL 3000W SMD
- Quantity:
- Payment:
- Shipping:
Inventory:5,676
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Product details
Overview
SMDJ12CA from Alpha & Omega Semiconductor is a bi-directional transient voltage suppressor diode in DO-214AB (SMC) package, designed for robust overvoltage protection in DC power rails and signal lines. It features 12.0 V reverse stand-off voltage, 13.3–14.7 V breakdown voltage at 1 mA, 19.9 V maximum clamping voltage at 150.8 A peak pulse current, and 3000 W peak pulse power rating on 10/1000 µs waveform.
For engineers reviewing the SMDJ12CA datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional clamping capability, low leakage (≤2.0 µA @ 12 V), fast response time (<1.0 ps), JEDEC DO-214AB surface-mount compatibility, and UL 94V-0 flammability rating.
Technical Context
The SMDJ12CA operates as a bi-directional avalanche diode, providing symmetrical clamping in both polarities without external polarity biasing. Its glass-passivated junction ensures stable breakdown characteristics and low temperature coefficient (0.1% × VBR per °C ΔT), while the built-in strain relief enhances mechanical reliability under thermal cycling.
Designed for non-repetitive surge suppression, it supports a 0.01% duty cycle with 8.3 ms half-sine surge rating up to 300 A, and exhibits typical thermal resistance of 15 °C/W junction-to-lead when mounted on 8.0 mm × 8.0 mm copper pads - enabling effective power dissipation during transient events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 12.0 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT=1 mA | 13.3–14.7 V - Confirmed breakdown range ensuring reliable turn-on margin above VRWM |
| VC @ IPPM=150.8 A | 19.9 V - Clamping voltage limiting protected circuit stress during 3000 W transients |
| PPPM (10/1000 µs) | 3000 W - Peak surge energy handling capacity for lightning or ESD-induced spikes |
| IR @ VRWM | ≤2.0 µA - Low leakage preserves efficiency in high-impedance or battery-powered circuits |
| TJ Range | −55 to +150 °C - Full industrial temperature operation without derating loss |
| Package | DO-214AB (SMC J-Bend) - Standardized surface-mount footprint with strain relief and MSL1 reflow compatibility |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with J-bend leads, matte tin lead-free plating, UL 94V-0 flammability rating, and JEDEC-compliant mechanical dimensions. Cathode identification via color band applies only to unidirectional variants; SMDJ12CA is bi-directional and has no polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction terminals | No functional distinction - either terminal serves as clamping node in AC or floating DC applications |
| Case / Body | Non-electrical mechanical structure | Provides strain relief, thermal path to PCB copper, and environmental sealing per JEDEC DO-214AB spec |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under repeated surge stress |
| Fast response time <1.0 ps | Clamps transients before downstream ICs experience damaging voltage overshoot |
| MSL1 reflow compatibility | Supports standard lead-free reflow profiles up to 260 °C peak without degradation |
| UL 94V-0 plastic housing | Meets fire-safety requirements for enclosed industrial and telecom equipment |
| Built-in strain relief | Reduces solder joint fatigue under thermal expansion mismatch between PCB and device body |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
Use Scenario: Protection of IGBT gate drivers and DC bus sensing circuits against switching-induced voltage spikes. IC Role / Device Role / Timing Role: Bidirectional clamping element placed across DC link or gate resistor networks to limit transient excursions. Use Value: Prevents false triggering or destruction of gate drivers by holding voltage within ±19.9 V during 3000 W surges. | Use Scenario: Input-stage surge suppression on −48 V telecom rectifier outputs exposed to lightning-induced common-mode transients. IC Role / Device Role / Timing Role: Primary TVS device bridging power rail to chassis ground to shunt differential and common-mode surges. Use Value: Maintains system uptime by clamping 10/1000 µs surges to ≤19.9 V without degradation after repeated 0.01% duty cycle events. |
| Automotive Body Control Modules | Industrial PLC I/O Terminals |
Use Scenario: CAN bus line protection in 12 V vehicle subsystems subject to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bi-directional TVS placed across CAN_H/CAN_L pair to absorb bidirectional transients without disrupting differential signaling. Use Value: Enables compliance with ISO 16750-2 Level III (100 V, 40 ms) by clamping symmetrically with ≤2.0 µA leakage at 12 V standby. | Use Scenario: Analog input protection on 4–20 mA sensor interfaces in factory automation cabinets exposed to EFT bursts. IC Role / Device Role / Timing Role: Front-end transient limiter on signal conditioning PCBs to prevent op-amp saturation or ADC damage. Use Value: Preserves measurement accuracy by limiting transient overvoltage to 19.9 V while adding negligible capacitance (<100 pF @ 0 V) to signal path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC12 | Same DO-214AB package, 12 V VRWM, but lower PPPM (1500 W) and higher VC (23.2 V @ 65 A) | Rated for lighter-duty surge environments; not suitable for 3000 W lightning-level threats | Select SAC12 only if system-level testing confirms 1500 W surge immunity is sufficient and layout allows higher clamping voltage. |
| 1.5KE12CA | Through-hole DO-15 package, same 12 V VRWM and bidirectional function, but larger footprint and lower thermal performance (RθJA ≈ 100 °C/W) | Requires PCB redesign for through-hole mounting; less suitable for high-density automated assembly | Choose 1.5KE12CA only when legacy through-hole design constraints prohibit surface-mount adoption. |
Compared with SAC12 and 1.5KE12CA, the SMDJ12CA delivers superior surge robustness (3000 W vs. 1500 W or ~1500 W), tighter VBR tolerance (±5.2% vs. ±10%), and optimized thermal performance in surface-mount form - making it preferred for space-constrained, high-reliability industrial and automotive applications.
Availability
SMDJ12CA is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, and automotive body control modules requiring stable component supply, RoHS-compliant sourcing, and consistent DO-214AB packaging across production lots.
Supply support for SMDJ12CA 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
Alpha & Omega Semiconductor (AOS) is a fabless power semiconductor company specializing in MOSFETs, TVS diodes, and power ICs for high-efficiency power conversion and protection.
The SMDJ series is part of AOS' transient voltage suppressor portfolio, engineered specifically for high-power, surface-mount surge protection in industrial, telecom, and automotive systems where reliability under repetitive surge stress is critical.
FAQ
What is the clamping voltage of the SMDJ12CA under maximum rated surge current?
The SMDJ12CA clamps to a maximum of 19.9 V when subjected to its rated peak pulse current of 150.8 A on a 10/1000 µs waveform. This value is measured and guaranteed per AOS datasheet Rev. 1.2, ensuring predictable voltage limiting during surge events. The SMDJ12CA maintains this clamping performance across its full operating temperature range of −55 to +150 °C.
Is the SMDJ12CA suitable for bidirectional signal line protection?
Yes, the SMDJ12CA is explicitly designed for bidirectional use, as indicated by the "CA" suffix and confirmed in the datasheet's "DEVICES FOR BIPOLAR APPLICATION" section. Its symmetrical breakdown and clamping behavior in both directions makes it ideal for protecting AC-coupled interfaces like RS-485, CAN, or Ethernet PHY lines. The SMDJ12CA does not require polarity-aware placement on PCBs.
What is the maximum steady-state power dissipation of the SMDJ12CA at room temperature?
The SMDJ12CA is not rated for continuous power dissipation; it is a transient suppression device. Its steady-state power handling is limited by thermal resistance: at 25 °C ambient and with 8.0 mm × 8.0 mm copper pads, its RθJA is 75 °C/W, meaning sustained power >1.0 W would exceed its 150 °C junction limit. The SMDJ12CA is intended solely for short-duration surge events, not DC power regulation.
Does the SMDJ12CA meet lead-free reflow requirements?
Yes, the SMDJ12CA meets J-STD-020 MSL1 classification with a maximum peak reflow temperature of 260 °C, and features matte tin lead-free plating compatible with standard Pb-free solder processes. Its DO-214AB package is qualified for single reflow exposure without delamination or parameter shift. The SMDJ12CA is also RoHS and halogen-free compliant per AOS Green Policy.
How does the SMDJ12CA compare to unidirectional SMDJ12A in circuit implementation?
The SMDJ12CA provides symmetrical clamping in both directions, eliminating the need for polarity-aware routing or external diode pairing; the SMDJ12A requires correct cathode orientation and only protects against negative-going transients on the anode side. In floating or AC-coupled nodes - such as CAN bus or audio lines - the SMDJ12CA simplifies layout and improves fault coverage. Both share identical VRWM, VBR, and PPPM ratings.
SMDJ12CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 150.8A
- Power - Peak Pulse:
- 3000W (3kW)
- 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
SMDJ12CA FAQ
1.How can I place an order for SMDJ12CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ12CA 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 SMDJ12CA reliable?
The price and inventory of SMDJ12CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ12CA is usually 5 days.
3.What payment methods are accepted for SMDJ12CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ12CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ12CA?
SMDJ12CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ12CA 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 SMDJ12CA?
For technical support, including SMDJ12CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ12CA requirements.
6.How does Aetrix verify that SMDJ12CA is sourced from the original manufacturer or authorized distributors?
All SMDJ12CA 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 SMDJ12CA meets industry standards.
7.What is the process for return or replacement of SMDJ12CA?
All SMDJ12CA units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ12CA, 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 SMDJ12CA part is unused and in its original packaging.
Return procedure for SMDJ12CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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