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Alpha & Omega Semiconductor Inc. SMDJ8.0CA
- Part No.:
- SMDJ8.0CA
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ8.0CA.pdf
- Description:
- 1CH 8.0V BIDIRECTIONAL 3000W SMD
- Quantity:
- Payment:
- Shipping:
Inventory:7,858
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Product details
Overview
SMDJ8.0CA 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 8.0 V reverse stand-off voltage (VRWM), 8.89–9.83 V breakdown voltage (VBR) at 1 mA, 13.6 V maximum clamping voltage (VC) at 220.6 A peak pulse current, and 3000 W peak pulse power rating on 10/1000 µs waveform.
For engineers reviewing the SMDJ8.0CA datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VBR ≈ 1.45), JEDEC-compliant DO-214AB thermal performance (RθJA = 75 °C/W), and suitability for IEC 61000-4-2/4-5 compliant industrial power input stages.
Technical Context
The SMDJ8.0CA operates as a bi-directional avalanche diode with glass-passivated junction and low-profile surface-mount construction. Its clamping action begins at ±8.0 V reverse stand-off and sustains 3000 W transient energy without degradation under ≤0.01% duty cycle conditions.
It delivers sub-1 ps response time from 0 V to breakdown, supports 300 A non-repetitive forward surge (8.3 ms half-sine), and maintains stable VBR temperature coefficient of 0.1 % × VBR per °C change - critical for precision rail protection across -55 °C to +150 °C junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 8.0 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR @ IT=1 mA | 8.89–9.83 V - Confirmed breakdown threshold defining turn-on precision and tolerance band |
| VC @ IPPM | 13.6 V - Clamped voltage at 220.6 A peak pulse, limiting downstream stress during surge events |
| PPPM (10/1000 µs) | 3000 W - Peak transient energy handling capacity on standard lightning/surge waveform |
| TJ max / TSTG | -55 to +150 °C - Full industrial temperature range supported with no derating up to 125 °C ambient |
| RθJA / RθJL | 75 / 15 °C/W - Thermal resistance values enabling reliable power dissipation on 8 mm × 8 mm copper pads |
| IR @ VRWM | 50 µA - Low leakage ensures minimal standby power loss in always-on protection circuits |
Pinout & Package
DO-214AB (SMC J-Bend) package: molded plastic case with matte tin lead-free plating, JEDEC-compliant outline, and color band denoting cathode end in unidirectional variants; bidirectional SMDJ8.0CA has no polarity marking and conducts symmetrically in both directions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (Bidirectional) | Surge current path terminal | Both terminals function identically - no fixed anode/cathode; enables symmetrical clamping across AC or floating DC lines |
| Case (Plastic Body) | Thermal and mechanical interface | Non-conductive housing; heat transfer occurs via soldered leads only - requires 8 mm × 8 mm copper pads per terminal for rated PPPM |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled interfaces or differential buses without polarity concerns |
| Glass-passivated junction | Ensures long-term stability of VBR and IR under repeated surge stress and humidity exposure |
| MSL1 moisture sensitivity | Allows reflow at 260 °C peak without popcorn failure - compatible with standard SMT assembly lines |
| UL 94V-0 flammability rating | Meets safety standards for enclosure-integrated surge protection in certified industrial equipment |
| Strain relief structure | Reduces mechanical stress at lead-to-body junction during board flexure or thermal cycling |
Applications
| Industrial Power Input Protection | Automotive Body Control Module (BCM) Inputs |
|---|---|
Use Scenario: 12 V battery-fed control boards exposed to load dump and ISO 7637-2 transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of DC-DC converters and microcontrollers. Use Value: Limits transient voltage to ≤13.6 V during 3000 W surges, preventing latch-up or gate oxide damage in downstream ICs. |
Use Scenario: CAN/LIN bus nodes connected to vehicle chassis ground with shared power return paths. IC Role / Device Role / Timing Role: Bidirectional TVS shunting common-mode spikes between signal and supply rails. Use Value: Symmetric clamping protects both high- and low-side drivers without requiring dual unidirectional devices. |
| AC-DC Adapter Secondary Side | RS-485 Transceiver Port Protection |
Use Scenario: Output rectifier stage of offline SMPS where output ripple and line surges coexist. IC Role / Device Role / Timing Role: Fast-response clamp absorbing residual switching spikes and external EFT bursts. Use Value: Sub-1 ps response ensures clamping activation before 12 V rail overshoot exceeds 13.6 V, preserving regulator integrity. |
Use Scenario: Half-duplex RS-485 transceivers interfacing with long cables in factory automation networks. IC Role / Device Role / Timing Role: Line-to-line and line-to-ground surge suppression on A/B differential pair. Use Value: 3000 W rating handles multiple 4 kV contact ESD strikes per IEC 61000-4-2 without parameter shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC8.0 | Same VRWM (8.0 V) and PPPM (3000 W), but TO-220AC package - higher RθJA (40 °C/W) and manual assembly requirement | Used where through-hole mounting and heatsink attachment are preferred over SMT density | Select SAC8.0 only when board space allows larger footprint and thermal management includes external heatsinking |
| SMLJ8.0CA | Same electrical specs and DO-214AB package, but lower PPPM (1500 W) and reduced IPPM (110.3 A) - half the surge capacity | Suitable for cost-sensitive consumer electronics with lower IEC test requirements (e.g., Level 2 vs Level 4) | Choose SMLJ8.0CA only if system-level surge testing confirms 1500 W is sufficient; SMDJ8.0CA remains required for full IEC 61000-4-5 compliance |
Compared with SAC8.0 and SMLJ8.0CA, the SMDJ8.0CA uniquely combines 3000 W surge rating, DO-214AB SMT compatibility, and bidirectional symmetry - making it the only option meeting industrial-grade surge immunity while fitting automated PCB assembly workflows.
Availability
SMDJ8.0CA is available at Aetrix Electronics and suitable for industrial power input protection, automotive BCM inputs, AC-DC adapter secondary side regulation, and RS-485 transceiver port protection requiring stable component supply and full IEC 61000-4-2/4-5 compliance.
Supply support for SMDJ8.0CA 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 robust circuit protection.
The SMDJ series was developed specifically for high-power, surface-mount transient suppression in industrial and automotive systems - emphasizing low clamping ratio, JEDEC-standard packaging, and repeatable surge endurance.
FAQ
What is the clamping voltage of the SMDJ8.0CA at its rated peak pulse current?
The SMDJ8.0CA exhibits a maximum clamping voltage (VC) of 13.6 V when subjected to its rated peak pulse current (IPPM) of 220.6 A on a 10/1000 µs waveform. This value is measured under standardized test conditions with the device mounted on 8.0 mm × 8.0 mm copper pads per terminal, ensuring consistent thermal performance and accurate comparison across design iterations.
Is the SMDJ8.0CA unidirectional or bidirectional, and how does that affect PCB layout?
The SMDJ8.0CA is a bidirectional TVS diode, meaning it clamps symmetrically in both polarities without defined anode or cathode terminals. Unlike unidirectional variants (e.g., SMDJ8.0A), it requires no orientation during placement - simplifying SMT assembly and eliminating risk of reverse installation. Its DO-214AB package has no polarity marking, and both leads serve identical surge conduction roles.
Does the SMDJ8.0CA meet RoHS and halogen-free compliance standards?
Yes, the SMDJ8.0CA is an AOS Green Product: fully RoHS compliant, lead-free, and halogen-free per AOS' internal specification and the EU Directive 2011/65/EU. It carries no brominated flame retardants and meets UL 94V-0 flammability requirements - verified in the official AOS Green Policy document (aospdf.com/media/AOSGreenPolicy.pdf).
What is the maximum operating junction temperature for the SMDJ8.0CA, and how does it impact thermal design?
The SMDJ8.0CA has a maximum junction temperature (TJ max) of +150 °C, with a specified operating range from -55 °C to +150 °C. Its thermal resistance values - RθJA = 75 °C/W and RθJL = 15 °C/W - require adherence to JEDEC mounting guidelines: 8.0 mm × 8.0 mm copper pads per terminal. Exceeding these pad dimensions or ambient temperatures above 125 °C necessitates derating per the published pulse derating curve.
Can the SMDJ8.0CA be used in place of the SMDJ8.0A in a design?
No - the SMDJ8.0CA and SMDJ8.0A are not interchangeable without circuit review. The SMDJ8.0CA is bidirectional and clamps equally in both directions, while the SMDJ8.0A is unidirectional and conducts only when cathode is positive relative to anode. Replacing one with the other may cause unintended conduction paths or failed surge suppression in polarity-sensitive applications like DC power rails.
SMDJ8.0CA 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):
- 8V
- Voltage - Breakdown (Min):
- 8.89V
- Voltage - Clamping (Max) @ Ipp:
- 13.6V
- Current - Peak Pulse (10/1000µs):
- 220.6A
- 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
SMDJ8.0CA FAQ
1.How can I place an order for SMDJ8.0CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ8.0CA 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 SMDJ8.0CA reliable?
The price and inventory of SMDJ8.0CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ8.0CA is usually 5 days.
3.What payment methods are accepted for SMDJ8.0CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ8.0CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ8.0CA?
SMDJ8.0CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ8.0CA 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 SMDJ8.0CA?
For technical support, including SMDJ8.0CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ8.0CA requirements.
6.How does Aetrix verify that SMDJ8.0CA is sourced from the original manufacturer or authorized distributors?
All SMDJ8.0CA 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 SMDJ8.0CA meets industry standards.
7.What is the process for return or replacement of SMDJ8.0CA?
All SMDJ8.0CA units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ8.0CA, 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 SMDJ8.0CA part is unused and in its original packaging.
Return procedure for SMDJ8.0CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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