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Alpha & Omega Semiconductor Inc. SMDJ75CA
- Part No.:
- SMDJ75CA
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ75CA.pdf
- Description:
- 1CH 75V BIDIRECTIONAL 3000W SMD
- Quantity:
- Payment:
- Shipping:
Inventory:8,196
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Product details
Overview
SMDJ75CA 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 75 V reverse stand-off voltage (VRWM), 83.3–92.1 V breakdown voltage (VBR) at 1 mA, 121 V maximum clamping voltage (VC) at 24.8 A peak pulse current, and 3000 W peak pulse power rating on 10/1000 µs waveform.
For engineers reviewing the SMDJ75CA datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional clamping capability, low leakage (<2 µA @ 75 V), fast response time (<1.0 ps), thermal resistance (RθJA = 75 °C/W), and compliance with J-STD-020 MSL Level 1 reflow profile.
Technical Context
The SMDJ75CA operates as a voltage-clamped avalanche diode, leveraging glass-passivated junction technology to deliver precise, repeatable breakdown behavior under transient stress. Its bi-directional symmetry enables protection of AC-coupled or floating signal paths without polarity constraints.
Designed for non-repetitive surge events at ≤0.01% duty cycle, it sustains 3000 W peak pulse power when mounted on 8.0 mm × 8.0 mm copper pads, with thermal performance governed by RθJL = 15 °C/W and RθJA = 75 °C/W - critical for PCB layout and heatsinking decisions in industrial power supplies and telecom infrastructure.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 75 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC bias margin. |
| VBR @ IT=1 mA | 83.3–92.1 V - Measured breakdown range confirming tight tolerance for reliable overvoltage thresholding. |
| VC @ IPPM | 121 V - Clamped voltage at 24.8 A peak pulse; determines protected circuit's maximum transient exposure. |
| PPPM (10/1000 µs) | 3000 W - Peak surge energy handling capacity; supports IEC 61000-4-5 Level 4 compliance in robust designs. |
| IR @ VRWM | <2 µA - Ultra-low leakage ensures minimal standby power loss and signal integrity in high-impedance circuits. |
| TJ max | +150 °C - Maximum junction temperature enabling operation in harsh environments like automotive engine bays or industrial enclosures. |
| Package | DO-214AB (SMC J-Bend) - Surface-mount footprint optimized for automated assembly and board space efficiency. |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with J-bend leads; cathode identified by color band (not applicable for bi-directional SMDJ75CA - no polarity marking required).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional surge conduction path | Both terminals function identically; connects across protected line (e.g., between Line and Neutral or differential pair) without orientation dependency. |
| Case / Body | Thermal and mechanical interface | Plastic body provides electrical isolation; thermal path relies on soldered pad area (8.0 mm × 8.0 mm recommended per terminal) for RθJA management. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over lifetime and immunity to moisture-induced parameter drift in humid environments. |
| Fast response time <1.0 ps | Clamps ESD and lightning-induced transients before sensitive downstream ICs experience overstress. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without pre-baking, reducing manufacturing complexity. |
| UL 94V-0 flammability rating | Self-extinguishing plastic housing meets safety standards for enclosed power electronics and telecom equipment. |
| Matte tin lead-free plating | RoHS-compliant termination compatible with Pb-free soldering and eliminates whisker risk in long-life applications. |
Applications
| Industrial Power Supply Protection | Telecom Line Interface |
|---|---|
Use Scenario: Protecting 48 V DC input rails in programmable logic controllers (PLCs) against load dump and inductive switching surges. IC Role / Device Role / Timing Role: Primary clamping device placed at front-end input stage to shunt >3 kV transients before they reach DC-DC converters and microcontrollers. Use Value: Withstands 3000 W pulses and maintains <2 µA leakage at 75 V, preserving system efficiency while ensuring EN 61000-4-5 compliance. | Use Scenario: Safeguarding RS-485 transceivers and Ethernet PHYs connected to outdoor cabling exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Bi-directional TVS placed across differential pairs (A/B lines) to clamp both polarities of common-mode transients. Use Value: Symmetrical 75 V VRWM and sub-1 ps response prevent data corruption during fast-rising surges without adding signal skew or capacitance penalties. |
| Automotive Body Control Module | Renewable Energy Inverter Input |
Use Scenario: Securing LIN bus and sensor supply lines in vehicle body control units subjected to ISO 7637-2 pulse 5a (load dump). IC Role / Device Role / Timing Role: Secondary-level protection after primary fusing, absorbing residual 100 V/300 ms transients that bypass upstream filters. Use Value: 150 °C TJ max and DO-214AB ruggedness support under-hood mounting; clamping at 121 V prevents MCU reset or CAN transceiver latch-up. | Use Scenario: Shielding PV string combiner box inputs from induced surges due to nearby lightning strikes in solar farm installations. IC Role / Device Role / Timing Role: DC-side TVS installed between positive/negative PV strings and ground reference to divert common-mode energy. Use Value: Bidirectional architecture handles polarity reversal during fault conditions; 3000 W rating exceeds IEC 61643-31 Class II requirements for photovoltaic systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC75CA (Littelfuse) | Same DO-214AB package, identical VRWM (75 V), but higher VC = 125 V @ 24 A; slightly lower PPPM (2500 W). | Marginally reduced clamping performance; suitable where 4 V higher VC is acceptable for cost-sensitive BOMs. | Select SAC75CA only if system-level testing confirms 125 V clamping remains within protected IC's absolute maximum ratings. |
| 1.5KE75CA (ON Semiconductor) | Through-hole DO-15 package; same electrical specs (VRWM = 75 V, VBR = 83–92 V, VC = 121 V), but lower thermal performance (RθJA ≈ 100 °C/W) and no MSL1 rating. | Not suitable for high-density SMT production or reflow-only assembly; requires wave solder or hand-soldering. | Choose 1.5KE75CA only for legacy through-hole designs or prototyping where board real estate and assembly process allow. |
Compared with SAC75CA and 1.5KE75CA, the SMDJ75CA delivers superior surface-mount manufacturability, tighter thermal resistance (RθJA = 75 °C/W), and guaranteed MSL1 compatibility - making it the preferred choice for volume production of compact, high-reliability power electronics.
Availability
SMDJ75CA is available at Aetrix Electronics and suitable for industrial power supply protection, telecom line interface, automotive body control module, and renewable energy inverter input applications requiring stable component supply, RoHS-compliant sourcing, and full traceability.
Supply support for SMDJ75CA 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 part of AOS' transient protection portfolio, engineered specifically for high-power, surface-mount surge suppression in demanding DC and AC-coupled systems where reliability, low leakage, and fast response are mandatory.
FAQ
What is the maximum clamping voltage of the SMDJ75CA under a 10/1000 µs surge?
The SMDJ75CA has a maximum clamping voltage (VC) of 121 V when subjected to its rated peak pulse current of 24.8 A on a 10/1000 µs waveform. This value is measured per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream components remain within their absolute maximum voltage ratings. The SMDJ75CA achieves this clamping performance while maintaining low leakage and high surge endurance.
Is the SMDJ75CA suitable for bidirectional signal line protection?
Yes, the SMDJ75CA is explicitly designed for bidirectional protection, as indicated by the "CA" suffix and confirmed in its electrical characteristics table. It provides symmetrical clamping in both directions, making it ideal for protecting AC-coupled interfaces such as RS-485, CAN FD, or Ethernet PHYs where polarity reversal or common-mode surges occur. Unlike unidirectional variants, the SMDJ75CA does not require orientation during placement, simplifying assembly and improving design flexibility.
What is the thermal resistance specification for the SMDJ75CA, and how does it affect PCB layout?
The SMDJ75CA has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal, and a junction-to-lead resistance (RθJL) of 15 °C/W. These values directly inform PCB copper area requirements: undersized pads increase operating temperature, risking premature thermal runaway during repeated surges. To maintain reliability, designers must allocate sufficient thermal copper and avoid excessive trace length between the SMDJ75CA and ground/power planes.
Does the SMDJ75CA meet RoHS and halogen-free compliance standards?
Yes, the SMDJ75CA is an AOS Green Product, certified RoHS-compliant and halogen-free per AOS' internal policy and industry standards (IEC 61249-2-21). It features matte tin lead-free plating and UL 94V-0 rated molding compound. Documentation confirms compliance with EU RoHS Directive 2011/65/EU and exemption 7a, and all materials declarations are available via AOS' product portal - essential for medical, industrial, and export-controlled applications requiring full substance disclosure.
How does the SMDJ75CA compare to older 1.5KE-series TVS diodes in terms of mounting and reliability?
The SMDJ75CA replaces through-hole alternatives like the 1.5KE75CA with a DO-214AB surface-mount package, enabling automated pick-and-place assembly, higher board density, and improved mechanical stability under vibration. Its MSL Level 1 rating allows direct use in standard lead-free reflow without baking, unlike many legacy DO-15 parts. Additionally, the SMDJ75CA's glass-passivated junction and tighter VBR tolerance (±5.5%) enhance long-term parametric stability versus epoxy-passivated predecessors - directly increasing field reliability in mission-critical power systems.
SMDJ75CA 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):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 121V
- Current - Peak Pulse (10/1000µs):
- 24.8A
- 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
SMDJ75CA FAQ
1.How can I place an order for SMDJ75CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ75CA 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 SMDJ75CA reliable?
The price and inventory of SMDJ75CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ75CA is usually 5 days.
3.What payment methods are accepted for SMDJ75CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ75CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ75CA?
SMDJ75CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ75CA 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 SMDJ75CA?
For technical support, including SMDJ75CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ75CA requirements.
6.How does Aetrix verify that SMDJ75CA is sourced from the original manufacturer or authorized distributors?
All SMDJ75CA 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 SMDJ75CA meets industry standards.
7.What is the process for return or replacement of SMDJ75CA?
All SMDJ75CA units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ75CA, 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 SMDJ75CA part is unused and in its original packaging.
Return procedure for SMDJ75CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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