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Alpha & Omega Semiconductor Inc. SMDJ8.5A
- Part No.:
- SMDJ8.5A
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ8.5A.pdf
- Description:
- 1CH 8.5V UNIDIRECTIONAL 3000W SM
- Quantity:
- Payment:
- Shipping:
Inventory:8,889
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Product details
Overview
SMDJ8.5A from Alpha & Omega Semiconductor is a unidirectional transient voltage suppressor diode designed for high-energy surge protection in DC power lines and signal interfaces. It features a 8.5 V reverse standoff voltage (VRWM), 9.44–10.40 V breakdown voltage (VBR) at 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 - deployed in industrial motor drives to protect gate drivers from IGBT switching transients.
For engineers reviewing the SMDJ8.5A datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to protected IC VDD rails, thermal resistance (RθJL = 15 °C/W) under PCB copper pad constraints, unidirectional polarity confirmation, and DO-214AB package compatibility with automated SMT placement and reflow profiles up to 260 °C.
Technical Context
The SMDJ8.5A operates as a silicon avalanche diode that enters controlled breakdown when transient voltage exceeds its VBR threshold, diverting surge current away from downstream circuitry. Its glass-passivated junction ensures stable leakage performance and long-term reliability under repetitive surges at ≤0.01% duty cycle.
Designed for surface-mount use on 8.0 mm × 8.0 mm copper pads per terminal, it delivers 3000 W peak pulse power handling with sub-1 ps response time and low-profile DO-214AB packaging - enabling compact placement near connectors or power entry points without compromising thermal dissipation or board space efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 8.5 V - Maximum continuous reverse operating voltage before clamping begins; sets minimum margin above nominal 5–12 V supply rails. |
| VBR @ IT=1 mA | 9.44–10.40 V - Confirmed breakdown range ensuring predictable turn-on during overvoltage events. |
| VC @ IPPM | 14.4 V - Clamping voltage at 208.4 A peak pulse; defines worst-case voltage seen by protected circuitry. |
| PPPM (10/1000 µs) | 3000 W - Peak surge energy absorption capacity; supports EN 61000-4-5 Level 4 (4 kV) compliance with proper layout. |
| IR @ VRWM | 20 µA - Reverse leakage at rated standoff; low enough to avoid loading sensitive bias networks or battery-powered circuits. |
| RθJL | 15 °C/W - Junction-to-lead thermal resistance; enables reliable operation up to 150 °C junction temperature with adequate PCB copper thermal mass. |
Pinout & Package
DO-214AB (SMC J-Bend) surface-mount package with molded plastic case and matte tin lead-free plating. Cathode indicated by color band; polarity confirmed unidirectional per part suffix 'A'.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge return path | Connected to system ground or low-impedance reference plane; carries full transient current during clamping. |
| Cathode | Protected line connection | Connected to input rail or signal line being safeguarded; voltage referenced to anode during conduction. |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | <1.0 ps - Enables suppression of ESD and fast-rising lightning-induced transients before downstream ICs experience overstress. |
| Glass passivated junction | Stable VBR tolerance and low IR drift over temperature and lifetime - critical for long-term field reliability in industrial environments. |
| MSL1 rating | Compatible with standard SMT reflow up to 260 °C peak - eliminates moisture sensitivity concerns and pre-bake requirements. |
| UL 94V-0 flammability | Self-extinguishing plastic housing - meets safety standards for enclosed power supplies and motor control enclosures. |
Applications
| Industrial Motor Drives | DC Power Input Protection |
|---|---|
Use Scenario: Protecting gate driver ICs and isolated power supplies from IGBT switching transients and inductive kickback in variable frequency drives. IC Role / Device Role / Timing Role: Transient voltage suppressor placed across DC bus or gate drive supply rails to clamp voltage spikes below MOSFET/IGBT absolute maximum ratings. Use Value: Prevents cumulative degradation of gate oxide and avoids catastrophic failure during repeated motor startup/stall conditions. |
Use Scenario: Safeguarding 12 V or 24 V DC inputs in programmable logic controllers (PLCs) against load dump and automotive-style battery transients. IC Role / Device Role / Timing Role: Primary surge shunt device located at connector entry point, upstream of DC-DC converters and microcontrollers. Use Value: Maintains system uptime by absorbing 3000 W pulses without degradation, meeting ISO 7637-2 Pulse 5a requirements. |
| Telecom Power Feeds | Renewable Energy Inverters |
Use Scenario: Protecting PoE (Power over Ethernet) midspan injectors and PSE controllers from induced surges on outdoor cabling runs. IC Role / Device Role / Timing Role: Unidirectional TVS mounted on secondary-side DC output to limit voltage overshoot during cable disconnect transients. Use Value: Ensures IEEE 802.3af/at compliance by clamping to 14.4 V while maintaining <20 µA leakage at 8.5 V standby. |
Use Scenario: Shielding MPPT controller inputs and DC link monitoring circuits in solar string inverters exposed to lightning-induced surges. IC Role / Device Role / Timing Role: High-power TVS on PV array input terminals to divert multi-kW transients before entering isolation stages. Use Value: Supports UL 1741 SA certification by sustaining 3000 W pulses without parametric shift or thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC8.5 | Same DO-214AB package; lower PPPM (1500 W); higher VC (15.0 V at 100 A). | Limited to lower-energy surges; not suitable for EN 61000-4-5 Level 4 testing. | Select only if system-level surge stress is verified ≤1500 W and clamping margin allows 15.0 V. |
| 1.5KE8.5A | Through-hole DO-201 package; identical electrical specs but incompatible with SMT assembly. | Requires manual or wave-solder process; unsuitable for high-density or automated production. | Choose only for legacy through-hole designs or prototyping where reflow compatibility is not required. |
Compared with SAC8.5 and 1.5KE8.5A, the SMDJ8.5A provides superior surge robustness (3000 W vs. 1500 W or same-rated but THT-limited), full SMT manufacturability, and tighter thermal management via RθJL = 15 °C/W - making it the preferred choice for new industrial and renewable energy designs requiring high-reliability, high-volume production.
Availability
SMDJ8.5A is available at Aetrix Electronics and suitable for industrial motor drives, DC power input protection, and telecom power feeds requiring stable component supply, RoHS-compliant sourcing, and consistent DO-214AB packaging across production batches.
Supply support for SMDJ8.5A 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 industrial, computing, and consumer applications.
The SMDJ series was engineered specifically for high-power, surface-mount transient suppression in harsh environments - delivering 3000 W surge capability in the compact DO-214AB footprint while maintaining tight VBR tolerances and MSL1 reflow compatibility.
FAQ
What is the clamping voltage of the SMDJ8.5A under maximum surge conditions?
The SMDJ8.5A has a maximum clamping voltage (VC) of 14.4 V at 208.4 A peak pulse current on a 10/1000 µs waveform. This value represents the highest voltage the device allows across its terminals during a standardized surge event, directly defining the protection level for downstream components connected to the same rail. The SMDJ8.5A maintains this clamping performance consistently due to its glass-passivated junction and low dynamic impedance.
Is the SMDJ8.5A suitable for bidirectional surge protection?
No, the SMDJ8.5A is a unidirectional TVS diode, as indicated by the 'A' suffix and absence of 'CA' in the part number. It conducts only when cathode voltage exceeds anode voltage by ≥VBR. For bidirectional protection, the SMDJ8.5CA variant must be used - which exhibits symmetrical clamping in both polarities and is marked with 'DDT' code. Using SMDJ8.5A in AC or bipolar signal paths risks failure during negative transients.
What PCB layout guidelines apply to the SMDJ8.5A for optimal thermal and electrical performance?
To ensure rated 3000 W surge capability and thermal stability, the SMDJ8.5A must be mounted on 8.0 mm × 8.0 mm copper pads per terminal, as specified in the datasheet. Minimize trace length between the device and protected node, use internal ground planes for heat spreading, and avoid thermal reliefs on mounting pads. The SMDJ8.5A's RθJL of 15 °C/W assumes this copper area - reducing pad size degrades power derating and may cause premature thermal failure.
Does the SMDJ8.5A meet lead-free and RoHS compliance requirements?
Yes, the SMDJ8.5A is a certified AOS Green Product: fully RoHS compliant, halogen-free, and matte tin lead-free plated. It conforms to JEDEC J-STD-020 MSL1 moisture sensitivity level and supports peak reflow temperatures up to 260 °C. The SMDJ8.5A's packaging and materials documentation is publicly available via AOS' Green Policy PDF on aosmd.com.
How does the SMDJ8.5A compare to standard 1.5KE-series TVS diodes in terms of mounting and reliability?
The SMDJ8.5A uses DO-214AB surface-mount packaging versus the through-hole DO-201 used by 1.5KE8.5A, enabling automated assembly, higher board density, and improved mechanical shock resistance. Its glass-passivated junction and MSL1 rating also provide superior long-term parameter stability and reflow survivability compared to older epoxy-based 1.5KE devices. While electrical specs overlap, the SMDJ8.5A is engineered for modern industrial SMT production where reliability and scalability are critical.
SMDJ8.5A 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:
- 1
- Bidirectional Channels:
- -
- 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
SMDJ8.5A FAQ
1.How can I place an order for SMDJ8.5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ8.5A 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 SMDJ8.5A reliable?
The price and inventory of SMDJ8.5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ8.5A is usually 5 days.
3.What payment methods are accepted for SMDJ8.5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ8.5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ8.5A?
SMDJ8.5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ8.5A 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 SMDJ8.5A?
For technical support, including SMDJ8.5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ8.5A requirements.
6.How does Aetrix verify that SMDJ8.5A is sourced from the original manufacturer or authorized distributors?
All SMDJ8.5A 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 SMDJ8.5A meets industry standards.
7.What is the process for return or replacement of SMDJ8.5A?
All SMDJ8.5A units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ8.5A, 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 SMDJ8.5A part is unused and in its original packaging.
Return procedure for SMDJ8.5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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