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Alpha & Omega Semiconductor Inc. SMDJ7.5CA
- Part No.:
- SMDJ7.5CA
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ7.5CA.pdf
- Description:
- 1CH 7.5V BIDIRECTIONAL 3000W SMD
- Quantity:
- Payment:
- Shipping:
Inventory:9,686
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Product details
Overview
SMDJ7.5CA from Alpha & Omega Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, designed for high-energy surge protection in DC power lines and data interfaces. It features 7.5 V reverse stand-off voltage, 12.9 V maximum clamping voltage at 232.6 A peak pulse current, and 3000 W peak pulse power dissipation on 10/1000 µs waveform.
For engineers reviewing the SMDJ7.5CA datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional clamping capability, low clamping ratio (1.72), 100 µA max reverse leakage at VRWM, JEDEC-compliant DO-214AB thermal performance (RθJA = 75 °C/W), and MSL1 moisture sensitivity rating.
Technical Context
The SMDJ7.5CA operates as a bi-directional avalanche diode, providing symmetrical clamping in both polarities without external polarity constraints. Its glass-passivated junction ensures stable breakdown behavior, while the low-profile DO-214AB package supports high-current surge handling with built-in strain relief and matte tin lead-free plating.
It delivers fast response time (<1.0 ps from 0 V to VBR) and meets J-STD-020 MSL1 requirements (peak reflow ≤260 °C). Electrical characteristics-including 8.33–9.21 V breakdown voltage at 1 mA test current and 15 °C/W typical junction-to-lead thermal resistance-are fully specified for bidirectional operation per device marking "CA" suffix.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 7.5 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR @ IT=1mA | 8.33–9.21 V - Confirmed breakdown range ensuring reliable turn-on margin above VRWM |
| Vc @ IPPM | 12.9 V - Clamping voltage limiting protected circuit to safe level during 232.6 A surge |
| PPPM | 3000 W - Peak pulse power handling on standard 10/1000 µs waveform |
| IR @ VRWM | 100 µA - Low leakage preserves efficiency in standby and low-power systems |
| TJ max | +150 °C - Enables operation in automotive under-hood and industrial ambient environments |
| Package | DO-214AB (SMC J-Bend) - JEDEC-standard surface-mount package with 8.0 mm × 8.0 mm copper pad thermal requirement |
Pinout & Package
DO-214AB (SMC J-Bend) package: molded plastic case with solderable matte tin-plated terminals per MIL-STD-750 Method 2026; polarity indicated by cathode band for unidirectional variants-omitted for bi-directional SMDJ7.5CA, which has symmetrical terminal function.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (Bidirectional) | Surge current path | Either terminal serves as anode or cathode depending on transient polarity; no fixed polarity assignment |
| Case / Body | Thermal conduction path | Directly coupled to internal die via leadframe; requires 8.0 mm × 8.0 mm copper pads per terminal for rated PPPM |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable, repeatable avalanche breakdown with minimal parameter drift over temperature and life |
| Fast response time <1.0 ps | Clamps transients before sensitive downstream ICs experience overvoltage stress |
| MSL1 rating (260 °C peak) | Supports standard lead-free reflow without popcorn or delamination risk |
| UL 94V-0 flammability | Meets safety standards for enclosure-integrated surge protection in industrial equipment |
| Built-in strain relief | Reduces mechanical stress on solder joints during board flexure or thermal cycling |
Applications
| Industrial Motor Drives | Automotive Power Distribution |
|---|---|
Use Scenario: Protection of 12 V DC bus against load dump and inductive switching spikes in PLC-controlled motor starters. IC Role / Device Role / Timing Role: Bidirectional TVS placed across input terminals to clamp ±100 V transients within 12.9 V. Use Value: Prevents MOSFET gate oxide failure and controller latch-up during repetitive 3000 W surges with 0.01% duty cycle. | Use Scenario: Surge suppression on battery feed lines in ADAS camera modules exposed to ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing 120 V/50 ms pulses without degradation. Use Value: Maintains 100 µA leakage at 7.5 V to avoid battery drain while delivering 232.6 A peak current capability. |
| Telecom Power Feeds | Renewable Energy Inverters |
Use Scenario: DC input protection for PoE-powered remote radios subjected to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Bi-directional clamping element on 48 V supply rail with symmetrical response to positive/negative transients. Use Value: Achieves 12.9 V clamping at 232.6 A, enabling use of lower-voltage-rated DC-DC converters downstream. | Use Scenario: DC-link surge protection in solar microinverters where PV string voltages reach 60–100 V. IC Role / Device Role / Timing Role: Primary overvoltage clamp on MPPT input stage during grid fault events. Use Value: Withstands 150 °C junction temperature and provides 3000 W pulse rating without derating up to +85 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC7.5 | Same DO-214AB package, but 7.5 V VRWM with 13.3 V clamping voltage (vs. 12.9 V); 220 A IPPM (vs. 232.6 A) | Higher clamping voltage reduces system-level protection margin; lower IPPM limits energy absorption | Select SMDJ7.5CA when tighter clamping and higher surge current headroom are required |
| SMCJ7.5CA | Identical electrical specs and DO-214AB package; differs only in manufacturer (Bourns vs. AOS) and minor thermal resistance (RθJA = 70 °C/W vs. 75 °C/W) | No functional or layout impact; same PCB footprint and mounting requirements | Choose SMDJ7.5CA for AOS's MSL1 reflow compliance and UL 94V-0 certified molding compound |
Compared with SAC7.5 and SMCJ7.5CA, the SMDJ7.5CA offers the lowest clamping voltage (12.9 V) and highest peak pulse current (232.6 A) in its VRWM class, delivering superior protection margin for sensitive 5–12 V logic rails while maintaining full compatibility with standard SMC assembly processes.
Availability
SMDJ7.5CA is available at Aetrix Electronics and suitable for industrial motor drives, automotive power distribution, and telecom power feeds requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.
Supply support for SMDJ7.5CA 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 designed specifically for high-energy transient suppression in harsh environments-targeting automotive, industrial, and renewable energy applications where reliability under repeated surge stress is critical.
FAQ
What does the "CA" suffix indicate in SMDJ7.5CA?
The "CA" suffix in SMDJ7.5CA denotes a bi-directional configuration, meaning the device provides symmetrical transient voltage suppression in both polarities. Unlike unidirectional "A" variants, SMDJ7.5CA has no designated anode or cathode and clamps equally for positive and negative surges-ideal for AC-coupled or floating DC lines. This is confirmed in the datasheet's "Devices for Bipolar Application" section and verified by identical VBR min/max values in both directions.
What is the maximum clamping voltage of SMDJ7.5CA and at what current is it specified?
The maximum clamping voltage of SMDJ7.5CA is 12.9 V, measured at its rated peak pulse current (IPPM) of 232.6 A under the standard 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and reflects worst-case clamping performance during surge events, directly supporting design margin calculations for downstream components.
Can SMDJ7.5CA be used in place of a unidirectional TVS like SMDJ7.5A?
No-SMDJ7.5CA cannot be substituted for SMDJ7.5A without circuit review, because SMDJ7.5CA is bi-directional and lacks polarity marking, whereas SMDJ7.5A is unidirectional with a defined cathode band. Using SMDJ7.5CA in a unidirectional bias configuration may cause unintended conduction; the reverse leakage (100 µA) applies across both polarities, not just one.
What thermal pad layout is required to achieve the full 3000 W rating of SMDJ7.5CA?
To achieve the full 3000 W peak pulse power rating, SMDJ7.5CA must be mounted on 8.0 mm × 8.0 mm copper pads connected to each terminal, as specified in the "Maximum Ratings" table. Smaller pads increase thermal resistance, reducing surge capability-RθJA degrades from 75 °C/W to >100 °C/W with inadequate copper area, risking thermal runaway during repetitive surges.
Is SMDJ7.5CA compliant with lead-free reflow standards?
Yes, SMDJ7.5CA is MSL1 rated per J-STD-020 and qualified for lead-free reflow with a maximum peak temperature of 260 °C. Its matte tin lead-free plating and UL 94V-0 flammability-rated plastic package ensure compatibility with standard Pb-free assembly processes without popcorn cracking or intermetallic degradation.
SMDJ7.5CA 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):
- 7.5V
- Voltage - Breakdown (Min):
- 8.33V
- Voltage - Clamping (Max) @ Ipp:
- 12.9V
- Current - Peak Pulse (10/1000µs):
- 232.6A
- 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
SMDJ7.5CA FAQ
1.How can I place an order for SMDJ7.5CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ7.5CA 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 SMDJ7.5CA reliable?
The price and inventory of SMDJ7.5CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ7.5CA is usually 5 days.
3.What payment methods are accepted for SMDJ7.5CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ7.5CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ7.5CA?
SMDJ7.5CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ7.5CA 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 SMDJ7.5CA?
For technical support, including SMDJ7.5CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ7.5CA requirements.
6.How does Aetrix verify that SMDJ7.5CA is sourced from the original manufacturer or authorized distributors?
All SMDJ7.5CA 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 SMDJ7.5CA meets industry standards.
7.What is the process for return or replacement of SMDJ7.5CA?
All SMDJ7.5CA units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ7.5CA, 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 SMDJ7.5CA part is unused and in its original packaging.
Return procedure for SMDJ7.5CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ7.5CA Tags
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