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Alpha & Omega Semiconductor Inc. SMDJ8.5CA
- Part No.:
- SMDJ8.5CA
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ8.5CA.pdf
- Description:
- 1CH 8.5V BIDIRECTIONAL 3000W SMD
- Quantity:
- Payment:
- Shipping:
Inventory:7,342
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Product details
Overview
SMDJ8.5CA 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 rails and data lines. It features 8.5 V reverse stand-off voltage (VRWM), 9.44–10.40 V breakdown voltage (VBR @ 1 mA), 14.4 V maximum clamping voltage (VC) at 208.4 A peak pulse current, and 3000 W peak pulse power rating on 10/1000 µs waveform.
For engineers reviewing the SMDJ8.5CA datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional clamping capability, low leakage (20 µA @ VRWM), fast response time (<1.0 ps), JEDEC DO-214AB surface-mount compatibility, and MSL1 moisture sensitivity level for lead-free reflow.
Technical Context
The SMDJ8.5CA operates as a bi-directional avalanche diode, providing symmetrical clamping in both polarities without requiring external polarity management. Its glass-passivated junction ensures stable VBR tolerance (±5% typical), while the low-profile DO-214AB package enables high-power density layout with minimal board space.
Designed for non-repetitive surge events at ≤0.01% duty cycle, it delivers 3000 W peak pulse power when mounted on 8.0 mm × 8.0 mm copper pads per terminal. Thermal resistance is 15 °C/W junction-to-lead and 75 °C/W junction-to-ambient, supporting reliable operation up to 150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 8.5 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT=1 mA | 9.44–10.40 V - Confirmed breakdown range ensuring predictable turn-on under surge |
| VC @ IPPM | 14.4 V - Clamping voltage at 208.4 A, limiting downstream voltage stress during ESD/EFT events |
| PPPM (10/1000 µs) | 3000 W - Peak surge energy absorption capacity for industrial-grade transient immunity |
| IR @ VRWM | 20 µA - Low leakage preserves system standby power integrity |
| TJ max | +150 °C - Enables use in high-temperature environments including automotive under-hood and industrial motor drives |
| Package | DO-214AB (SMC J-Bend) - Standardized surface-mount footprint compatible with automated assembly and IPC-7351B land patterns |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with J-bend leads; cathode band denotes polarity for unidirectional variants, but SMDJ8.5CA is bi-directional and has no functional polarity marking-both terminals are electrically symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bi-directional surge conduction path | Either terminal serves as input/output for transient current; no orientation required during placement |
| Case (plastic body) | Thermal and mechanical interface | Non-conductive housing; heat dissipation occurs via soldered leads to PCB copper pads |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| Fast response time <1.0 ps | Clamps transients before sensitive ICs experience overvoltage damage |
| Glass-passivated junction | Ensures long-term VBR stability and reduced parameter drift across temperature and life cycles |
| MSL1 rating (260 °C peak) | Supports standard lead-free reflow profiles without preconditioning or baking |
| UL 94V-0 flammability | Meets safety requirements for enclosed industrial and consumer end equipment |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of 12 V DC power inputs against load dump and alternator ripple surges. IC Role / Device Role / Timing Role: Primary surge suppression device placed at main power entry point before DC-DC converters. Use Value: Withstands 3000 W pulses and clamps to ≤14.4 V, preventing overvoltage shutdown or latch-up in microcontrollers and CAN transceivers. | Use Scenario: Bidirectional protection of LIN bus lines exposed to ESD and inductive switching noise. IC Role / Device Role / Timing Role: Line-level TVS placed directly at connector interface, parallel to transceiver I/O pins. Use Value: Symmetrical clamping ensures equal protection for positive and negative transients without additional components or routing constraints. |
| Telecom Power Feeds | Renewable Energy Inverters |
Use Scenario: Surge protection on -48 V DC telecom power distribution boards subject to lightning-induced surges. IC Role / Device Role / Timing Role: Secondary-stage TVS after primary GDT or MOV, providing precise low-clamp voltage for downstream regulators. Use Value: 8.5 V VRWM aligns with -48 V nominal systems using bias networks; 14.4 V VC prevents regulator overvoltage during 10/1000 µs surges. | Use Scenario: DC-link protection in solar string inverters where PV array surges couple into MPPT controller inputs. IC Role / Device Role / Timing Role: High-power transient clamp on DC input side, mounted on large copper thermal pads. Use Value: 3000 W PPPM and 15 °C/W RθJL enable robust thermal performance under repeated surge conditions in outdoor-rated enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC8.5CA (Littelfuse) | Same VRWM (8.5 V), identical DO-214AB package, but higher IR (50 µA @ VRWM) and lower PPPM (2500 W) | Limited to lower-energy surge environments; not recommended for 3000 W design margins | Select SMDJ8.5CA when full 3000 W rating and 20 µA leakage are required |
| SMCJ8.5CA (ON Semiconductor) | Identical electrical specs (VRWM, VBR, VC, PPPM), same DO-214AB package, but MSL2 rating (requires bake before reflow) | Requires additional handling steps in high-volume SMT lines; less suitable for just-in-time manufacturing | Prefer SMDJ8.5CA for MSL1-compliant production without process changes |
Compared with SAC8.5CA and SMCJ8.5CA, the SMDJ8.5CA offers superior leakage performance and eliminates moisture sensitivity handling overhead, making it optimal for high-reliability industrial and automotive power rail protection where thermal margin and process simplicity are critical.
Availability
SMDJ8.5CA is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power feeds requiring stable component supply, consistent parametric performance, and RoHS-compliant green packaging.
Supply support for SMDJ8.5CA 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, TVS diodes, and power ICs for computing, consumer, industrial, and automotive markets.
The SMDJ series is engineered for high-power transient suppression in harsh environments, targeting applications demanding robust 3000 W surge immunity, bi-directional symmetry, and lead-free manufacturability.
FAQ
What is the clamping voltage of the SMDJ8.5CA under a 10/1000 µs surge?
The SMDJ8.5CA exhibits a maximum clamping voltage (VC) of 14.4 V when subjected to its rated peak pulse current of 208.4 A on a 10/1000 µs waveform. This value is measured per JEDEC standards and guarantees predictable overvoltage limiting for downstream circuitry during transient events.
Is the SMDJ8.5CA unidirectional or bidirectional?
The SMDJ8.5CA is a bi-directional TVS diode, meaning it provides symmetrical clamping in both polarities. Unlike unidirectional variants (e.g., SMDJ8.5A), it has no cathode marking and functions identically regardless of terminal orientation, making it ideal for AC-coupled or floating signal line protection.
What is the maximum junction temperature rating for the SMDJ8.5CA?
The SMDJ8.5CA is rated for a maximum junction temperature (TJ) of +150 °C, enabling reliable operation in high-temperature environments such as automotive engine compartments, industrial motor drive cabinets, and outdoor renewable energy enclosures.
Does the SMDJ8.5CA meet lead-free reflow requirements?
Yes, the SMDJ8.5CA meets MSL1 per J-STD-020 with a maximum peak reflow temperature of 260 °C and requires no preconditioning or baking prior to surface-mount assembly, simplifying manufacturing for RoHS-compliant production lines.
What is the reverse leakage current of the SMDJ8.5CA at its rated VRWM?
The SMDJ8.5CA specifies a maximum reverse leakage current (IR) of 20 µA at its reverse stand-off voltage (VRWM) of 8.5 V, ensuring minimal power loss in standby or low-power modes while maintaining effective surge readiness.
SMDJ8.5CA 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):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 208.4A
- 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
SMDJ8.5CA FAQ
1.How can I place an order for SMDJ8.5CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ8.5CA 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 SMDJ8.5CA reliable?
The price and inventory of SMDJ8.5CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ8.5CA is usually 5 days.
3.What payment methods are accepted for SMDJ8.5CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ8.5CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ8.5CA?
SMDJ8.5CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ8.5CA 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 SMDJ8.5CA?
For technical support, including SMDJ8.5CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ8.5CA requirements.
6.How does Aetrix verify that SMDJ8.5CA is sourced from the original manufacturer or authorized distributors?
All SMDJ8.5CA 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 SMDJ8.5CA meets industry standards.
7.What is the process for return or replacement of SMDJ8.5CA?
All SMDJ8.5CA units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ8.5CA, 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 SMDJ8.5CA part is unused and in its original packaging.
Return procedure for SMDJ8.5CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ8.5CA Tags
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