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Alpha & Omega Semiconductor Inc. SMDJ22CA
- Part No.:
- SMDJ22CA
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ22CA.pdf
- Description:
- 1CH 22V BIDIRECTIONAL 3000W SMD
- Quantity:
- Payment:
- Shipping:
Inventory:8,977
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Product details
Overview
SMDJ22CA from Alpha & Omega Semiconductor is a bi-directional transient voltage suppressor diode in DO-214AB (SMC) package, designed for high-energy surge protection in DC power rails and data lines. It features 22.0 V reverse stand-off voltage (VRWM), 24.4–26.9 V breakdown voltage (VBR) at 1 mA, 35.5 V maximum clamping voltage (VC) at 84.6 A peak pulse current, and 3000 W peak pulse power rating on 10/1000 µs waveform.
For engineers reviewing the SMDJ22CA datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VBR ≈ 1.42), JEDEC DO-214AB surface-mount compatibility, thermal resistance (RθJA = 75 °C/W), and compliance with MSL Level 1 reflow requirements.
Technical Context
The SMDJ22CA operates as a bi-directional avalanche diode, symmetrically clamping transient overvoltages in both polarities without requiring external polarity management. Its glass-passivated junction ensures stable VBR tolerance and low leakage (≤2.0 µA @ VRWM), while built-in strain relief enhances mechanical robustness during board flexure or thermal cycling.
Designed for single-pulse surge events per IEC 61000-4-5 (10/1000 µs waveform), it delivers sub-nanosecond response time (<1.0 ps), supports 0.01% duty cycle repetition, and maintains clamping performance across -55 °C to +150 °C junction temperature range with RθJL = 15 °C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 22.0 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR @ IT=1 mA | 24.4–26.9 V - Confirmed breakdown threshold defining turn-on precision and tolerance band |
| VC @ IPPM | 35.5 V - Clamped voltage at 84.6 A peak pulse, determining protected circuit's maximum stress level |
| PPPM (10/1000 µs) | 3000 W - Peak transient energy absorption capacity under standardized surge waveform |
| TJ max / TSTG | -55 to +150 °C - Validated operating and storage temperature envelope for industrial environments |
| IR @ VRWM | ≤2.0 µA - Low leakage ensures minimal standby power loss and signal integrity in high-impedance circuits |
| RθJA | 75 °C/W - Thermal resistance from junction to ambient on standard 8 mm × 8 mm copper pads |
Pinout & Package
DO-214AB (SMC J-Bend) surface-mount package with molded plastic case and matte tin lead-free plating; polarity indicated by cathode band for unidirectional variants - omitted for bi-directional SMDJ22CA, which has symmetrical terminal function.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional surge conduction path | Either terminal serves as anode or cathode depending on transient polarity; no fixed polarity assignment |
| Case | Mechanical mounting & thermal path | Plastic body provides strain relief and insulation; thermal dissipation relies on PCB copper pad area (8 mm × 8 mm per terminal) |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity awareness |
| Glass-passivated junction | Ensures stable VBR over lifetime and immunity to moisture-induced parameter drift |
| MSL Level 1 rating | Supports lead-free reflow up to 260 °C peak without preconditioning or baking |
| UL 94V-0 flammability | Meets safety standards for enclosure-integrated surge protection in certified end equipment |
| Low profile SMC package | Reduces board height impact while maintaining 3000 W surge capability in surface-mount layout |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of 24 V DC power inputs against load dump and inductive switching transients in PLC I/O modules. IC Role / Device Role / Timing Role: Standoff-clamp TVS diode placed directly at connector entry point to shunt >100 A surges before reaching downstream regulators. Use Value: 35.5 V clamping limits rail overshoot below 40 V, preserving 36 V-rated input stages and eliminating need for secondary filtering. | Use Scenario: Surge suppression on LIN bus lines exposed to battery transients and ESD in door module ECUs. IC Role / Device Role / Timing Role: Bi-directional clamping element co-located with LIN transceiver to absorb ±30 kV ESD (IEC 61000-4-2) and 12 V system surges. Use Value: Symmetric clamping eliminates polarity-sensitive placement, reducing assembly error risk and enabling automated optical inspection of orientation. |
| Telecom Power Feeds | Renewable Energy Inverters |
Use Scenario: DC power input protection for PoE-powered remote radios subjected to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary surge arrestor on 48 V DC feed line, coordinated with upstream GDT and downstream π-filter. Use Value: 3000 W PPPM rating handles multi-kA induced surges while maintaining <1.0 ps response to prevent gate oxide damage in DC-DC controllers. | Use Scenario: DC link protection in solar string inverters where PV array transients couple into MPPT converter inputs. IC Role / Device Role / Timing Role: Bidirectional TVS placed across DC bus capacitors to clamp fast-rising common-mode spikes from ground loops or grid faults. Use Value: 150 °C TJ max enables operation in sealed enclosures with ambient temperatures up to 85 °C without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC22CA (Littelfuse) | Same DO-214AB package, identical VRWM (22 V), but higher VC = 37.0 V at 82 A; 2500 W PPPM rating | Limited to lower-energy surge environments due to 500 W lower peak power handling | Select when legacy Littelfuse BOM alignment is required and system-level clamping margin allows +1.5 V higher VC |
| 1.5KE22CA (ON Semiconductor) | Through-hole DO-15 package; same electrical specs but incompatible mounting; 1500 W PPPM (half the rating) | Requires PCB redesign and manual soldering; unsuitable for high-density automated assembly | Use only for repair or legacy through-hole systems where surface-mount upgrade is not feasible |
Compared with SAC22CA and 1.5KE22CA, the SMDJ22CA delivers superior surge robustness (3000 W vs. 2500 W/1500 W) in a RoHS-compliant, MSL Level 1 surface-mount package-enabling higher reliability in space-constrained, high-volume production without layout or process changes.
Availability
SMDJ22CA is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power feeds requiring stable component supply, long-term lifecycle support, and consistent parametric performance across manufacturing lots.
Supply support for SMDJ22CA 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 high-efficiency MOSFETs, TVS diodes, and power ICs for computing, consumer, industrial, and automotive markets.
The SMDJ series is engineered specifically for high-power transient suppression in harsh environments, emphasizing rugged packaging, tight VBR tolerance, and repeatable clamping performance under repetitive surge stress.
FAQ
What is the clamping voltage of the SMDJ22CA at its rated peak pulse current?
The SMDJ22CA has a maximum clamping voltage (VC) of 35.5 V at 84.6 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during a full-rated surge event and is measured with the device mounted on 8.0 mm × 8.0 mm copper pads per terminal, per the datasheet test condition.
Is the SMDJ22CA suitable for bidirectional signal line protection?
Yes, the SMDJ22CA is explicitly designed for bidirectional use, as indicated by the "CA" suffix and confirmed in the "DEVICES FOR BIPOLAR APPLICATION" section. Its symmetrical breakdown behavior ensures identical clamping in both polarities, making it appropriate for AC-coupled interfaces like RS-485, CAN, or LIN bus lines without polarity-dependent placement constraints.
Does the SMDJ22CA require special PCB layout considerations for thermal management?
Yes - the SMDJ22CA's thermal resistance (RθJA = 75 °C/W) is specified with 8.0 mm × 8.0 mm copper pads per terminal. To maintain rated power handling and avoid junction overheating during repeated surges, designers must implement minimum pad dimensions and consider internal copper planes or thermal vias to enhance heat spreading beyond the footprint.
What is the maximum reverse leakage current for the SMDJ22CA at its VRWM?
The maximum reverse leakage current (IR) for the SMDJ22CA is 2.0 µA at the rated reverse stand-off voltage of 22.0 V and ambient temperature of 25 °C. This low leakage ensures minimal impact on high-impedance sensing circuits and preserves battery life in always-on applications such as automotive body electronics.
How does the SMDJ22CA compare to unidirectional SMDJ22A in terms of application flexibility?
The SMDJ22CA offers greater flexibility than the unidirectional SMDJ22A in floating or AC-coupled systems because it clamps equally in both directions. The SMDJ22A requires correct polarity orientation and cannot protect against negative-going transients on positive rails - whereas the SMDJ22CA eliminates orientation dependency and simplifies BOM consolidation for dual-polarity protection needs.
SMDJ22CA 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):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 84.6A
- 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
SMDJ22CA FAQ
1.How can I place an order for SMDJ22CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ22CA 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 SMDJ22CA reliable?
The price and inventory of SMDJ22CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ22CA is usually 5 days.
3.What payment methods are accepted for SMDJ22CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ22CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ22CA?
SMDJ22CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ22CA 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 SMDJ22CA?
For technical support, including SMDJ22CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ22CA requirements.
6.How does Aetrix verify that SMDJ22CA is sourced from the original manufacturer or authorized distributors?
All SMDJ22CA 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 SMDJ22CA meets industry standards.
7.What is the process for return or replacement of SMDJ22CA?
All SMDJ22CA units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ22CA, 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 SMDJ22CA part is unused and in its original packaging.
Return procedure for SMDJ22CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ22CA Tags
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