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Alpha & Omega Semiconductor Inc. SMDJ70CA
- Part No.:
- SMDJ70CA
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ70CA.pdf
- Description:
- 1CH 70V BIDIRECTIONAL 3000W SMD
- Quantity:
- Payment:
- Shipping:
Inventory:8,606
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Product details
Overview
SMDJ70CA from Alpha & Omega Semiconductor is a bi-directional transient voltage suppressor (TVS) diode designed for high-energy surge protection in DC power lines and signal interfaces. It features a 70 V reverse standoff voltage (VRWM), 77.8–86.0 V breakdown voltage (VBR), 113 A peak pulse current (IPP), 3000 W peak pulse power (PPPM), and DO-214AB (SMC) surface-mount package - deployed in industrial motor drives to clamp lightning-induced surges on 48 V DC bus lines.
For engineers reviewing the SMDJ70CA datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional clamping capability, low clamping voltage (113 V @ IPP), JEDEC DO-214AB thermal performance (RθJA = 75 °C/W), and compliance with IEC 61000-4-5 surge immunity requirements.
Technical Context
The SMDJ70CA operates as a bi-directional avalanche diode, symmetrically clamping voltage transients in both polarities without requiring external polarity management. Its glass-passivated junction ensures stable VBR tolerance (±5% typical) and low temperature coefficient (0.1% × VBR/°C), enabling predictable clamping across –55 °C to +150 °C operating range.
Designed for non-repetitive 10/1000 μs surge waveforms per IEC 61000-4-5, it delivers 3000 W peak pulse power when mounted on 8.0 mm × 8.0 mm copper pads. Fast response time (<1.0 ps) ensures sub-nanosecond turn-on before sensitive downstream circuitry is exposed to overvoltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 70 V - Maximum continuous reverse operating voltage before clamping begins; sets system DC rail compatibility. |
| VBR @ IT=1 A | 77.8–86.0 V - Confirmed breakdown range at 1 mA test current; defines precise clamping onset threshold. |
| Vc @ IPP=113 A | 113 V - Clamped voltage during 10/1000 μs surge; determines maximum stress on protected ICs. |
| PPPM | 3000 W - Peak surge energy handling capacity on standard 10/1000 μs waveform; qualifies for Level 4 IEC 61000-4-5. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in high-ambient industrial enclosures. |
| RθJA | 75 °C/W - Thermal resistance from junction to ambient on standard PCB layout; informs heatsinking requirements. |
| IR @ VRWM | 2.0 μA - Reverse leakage at rated standoff voltage; ensures minimal standby power loss in battery-backed systems. |
Pinout & Package
DO-214AB (SMC J-Bend) surface-mount package: molded plastic case with matte tin lead-free plating, MSL1 rating (260 °C reflow peak), and cathode band marking for polarity identification. Bidirectional construction eliminates need for orientation-dependent placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bi-directional surge conduction path | Both terminals function identically under positive or negative transients; no fixed anode/cathode assignment required. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures long-term VBR stability and low parameter drift over temperature and lifetime. |
| Built-in strain relief | Reduces mechanical stress at lead-to-body interface during thermal cycling or board flexure. |
| Low-profile DO-214AB package | Enables compact placement near connectors or input filters without height interference in stacked assemblies. |
| Fast response time <1.0 ps | Clamps transients before propagation into downstream ESD-sensitive ICs such as RS-485 transceivers. |
| UL 94V-0 flammability rating | Confirms self-extinguishing behavior under fault conditions, supporting safety-critical industrial certifications. |
Applications
| Industrial Motor Drives | Telecom Power Feeds |
|---|---|
Use Scenario: Protecting 48 V DC bus inputs in variable-frequency drives from lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary surge clamping device placed directly at connector entry point ahead of DC-DC converters and gate drivers. Use Value: Limits transient voltage to ≤113 V, preventing damage to 100 V-rated MOSFETs and isolated gate drivers while sustaining 3000 W surge energy. | Use Scenario: Safeguarding -48 V telecom rectifier outputs against load-dump and hot-swap transients in central office equipment. IC Role / Device Role / Timing Role: Bi-directional clamping element on primary DC distribution rails feeding multiple shelf-mounted line cards. Use Value: Symmetric clamping ensures protection during both positive-going surges and negative-going reverse-polarity faults without polarity-aware routing. |
| Automotive Body Control Modules | Renewable Energy Inverters |
Use Scenario: Suppressing load-dump spikes (up to 120 V) on 12 V supply lines feeding BCM microcontrollers and CAN transceivers. IC Role / Device Role / Timing Role: Secondary-level TVS located after main fuse but before LDO regulators and communication ICs. Use Value: Withstands 300 A peak forward surge (IFSM) and maintains <2.0 μA leakage at 70 V, preserving battery runtime in always-on modules. | Use Scenario: Clamping grid-tie inverter DC-link voltage spikes caused by rapid PV array disconnection or transformer switching. IC Role / Device Role / Timing Role: High-power transient absorber on 600–1000 V DC bus, used in parallel arrays for multi-kW solar inverters. Use Value: Delivers 3000 W pulse rating with 15 °C/W junction-to-lead thermal resistance, enabling direct mounting to heatsinks for sustained surge duty cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC70CA (Littelfuse) | Same VRWM (70 V), identical DO-214AB package, but lower PPPM (1500 W) and higher Vc (120 V @ IPP). | Rated for lower surge energy; suitable only for Class 2 (1.5 kV) IEC 61000-4-5, not Level 4 (4 kV). | Select when cost sensitivity outweighs peak surge margin and system-level testing confirms 1500 W sufficiency. |
| SMCJ70CA (ON Semiconductor) | Identical electrical specs (VRWM, VBR, Vc, PPPM), same DO-214AB footprint, but RθJA = 80 °C/W vs. 75 °C/W. | Marginally reduced thermal performance on standard PCB; may require larger copper area for equivalent derating. | Acceptable drop-in alternative where thermal headroom exists or layout allows enhanced copper pour. |
Compared with SAC70CA and SMCJ70CA, the SMDJ70CA provides superior surge energy handling (3000 W) and tighter thermal resistance (75 °C/W), making it preferred for high-reliability industrial and renewable energy applications demanding full IEC 61000-4-5 Level 4 compliance.
Availability
SMDJ70CA is available at Aetrix Electronics and suitable for industrial motor drives, telecom power feeds, automotive body control modules, and renewable energy inverters requiring stable component supply and consistent surge performance across production batches.
Supply support for SMDJ70CA 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, IGBTs, and protection devices for power conversion and management.
The SMDJ series is engineered for robust transient suppression in harsh environments - targeting industrial automation, telecom infrastructure, and automotive subsystems where reliability under repetitive surge stress is critical.
FAQ
What is the clamping voltage of the SMDJ70CA under a 10/1000 µs surge?
The SMDJ70CA clamps to a maximum of 113 V when subjected to its rated peak pulse current of 113 A on a 10/1000 µs waveform. This value is measured per industry-standard test conditions (TA = 25 °C, mounted on 8.0 mm × 8.0 mm copper pads) and defines the upper voltage limit imposed on protected circuitry during surge events.
Is the SMDJ70CA unidirectional or bidirectional?
The SMDJ70CA is a bidirectional TVS diode, indicated by the "CA" suffix. It provides symmetrical clamping for both positive and negative transients, eliminating the need for polarity-specific placement and enabling use in AC-coupled or floating DC systems where voltage polarity reversal is possible.
What package type does the SMDJ70CA use, and is it RoHS compliant?
The SMDJ70CA uses the DO-214AB (SMC J-Bend) surface-mount package and is fully RoHS compliant, halogen-free, and qualified to MSL1 per J-STD-020 with a maximum reflow peak temperature of 260 °C. Its matte tin lead finish ensures reliable solderability and long-term intermetallic stability.
How does the SMDJ70CA compare to the SMDJ70A in terms of functionality?
The SMDJ70A is unidirectional (anode-cathode asymmetric), while the SMDJ70CA is bidirectional (symmetric). Both share identical VRWM (70 V), VBR (77.8–86.0 V), and PPPM (3000 W), but the SMDJ70CA must be used where transient polarity is undefined or reversible - such as across differential signal lines or AC inputs - whereas SMDJ70A suits single-polarity DC rails.
What is the maximum operating temperature range for the SMDJ70CA?
The SMDJ70CA has a specified operating junction and storage temperature range of –55 °C to +150 °C. This wide range supports deployment in under-hood automotive modules, outdoor telecom cabinets, and industrial motor control enclosures where ambient temperatures exceed 85 °C and thermal cycling is frequent.
SMDJ70CA 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):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 26.6A
- 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
SMDJ70CA FAQ
1.How can I place an order for SMDJ70CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ70CA 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 SMDJ70CA reliable?
The price and inventory of SMDJ70CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ70CA is usually 5 days.
3.What payment methods are accepted for SMDJ70CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ70CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ70CA?
SMDJ70CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ70CA 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 SMDJ70CA?
For technical support, including SMDJ70CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ70CA requirements.
6.How does Aetrix verify that SMDJ70CA is sourced from the original manufacturer or authorized distributors?
All SMDJ70CA 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 SMDJ70CA meets industry standards.
7.What is the process for return or replacement of SMDJ70CA?
All SMDJ70CA units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ70CA, 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 SMDJ70CA part is unused and in its original packaging.
Return procedure for SMDJ70CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ70CA Tags
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