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Alpha & Omega Semiconductor Inc. SMDJ9.0A
- Part No.:
- SMDJ9.0A
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ9.0A.pdf
- Description:
- 1CH 9.0V UNIDIRECTIONAL 3000W SM
- Quantity:
- Payment:
- Shipping:
Inventory:9,839
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Product details
Overview
SMDJ9.0A 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 9.0 V reverse stand-off voltage (VRWM), 10.0–11.1 V breakdown voltage (VBR) at 1 mA, 15.4 V maximum clamping voltage (VC) at 194.9 A peak pulse current, and 3000 W peak pulse power dissipation on 10/1000 µs waveform - deployed in industrial motor drives to protect gate drivers from IGBT switching transients.
For engineers reviewing the SMDJ9.0A datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to protected IC VDD, thermal resistance (RθJA = 75 °C/W), unidirectional polarity confirmation, and DO-214AB package compatibility with 8.0 mm × 8.0 mm copper pad layouts.
Technical Context
The SMDJ9.0A operates as a silicon avalanche diode with glass passivated junction and low-profile DO-214AB (SMC J-Bend) package. Its fast response time (<1.0 ps) enables suppression of ESD and lightning-induced surges before downstream components experience overvoltage stress.
It delivers 3000 W peak pulse power under standardized 10/1000 µs waveform conditions when mounted on 8.0 mm × 8.0 mm copper pads, with thermal resistance junction-to-ambient (RθJA) of 75 °C/W and junction-to-lead (RθJL) of 15 °C/W - enabling reliable operation up to TJ = 150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 9.0 V - Maximum continuous reverse operating voltage before leakage exceeds 10 µA; sets upper limit for protected circuit's normal operating range. |
| VBR @ IT=1 mA | 10.0–11.1 V - Measured breakdown threshold defining onset of avalanche conduction; tight tolerance ensures predictable turn-on behavior. |
| VC @ IPPM | 15.4 V - Clamped voltage at 194.9 A peak pulse current; determines maximum stress imposed on downstream ICs during surge events. |
| PPPM | 3000 W - Peak pulse power handling on 10/1000 µs waveform; defines energy absorption capability for transient immunity compliance (e.g., IEC 61000-4-5). |
| TJ max | +150 °C - Maximum junction temperature; constrains PCB layout thermal design and derating requirements above 25 °C ambient. |
| Polarity | Unidirectional - Cathode marked by band; blocks reverse current until breakdown, suited for DC-biased rails like 12 V supply inputs. |
| Package | DO-214AB (SMC J-Bend) - Surface-mount plastic case with J-bend leads; optimized for automated placement and high-current solder joints. |
Pinout & Package
DO-214AB (SMC J-Bend) package with two terminals: anode and cathode. Cathode identified by color band; polarity critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to lower-potential side of protected line (e.g., GND or return path); must be routed with low-inductance trace. |
| Cathode | Current exit terminal during reverse avalanche | Marked by band; connected to higher-potential rail (e.g., +9 V input); clamps voltage by shunting surge current to ground. |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | <1.0 ps - Enables suppression of sub-nanosecond ESD events before logic-level ICs latch-up or sustain oxide damage. |
| Glass passivated junction | Improved long-term reliability and stable VBR drift under thermal cycling and humidity exposure. |
| MSL Level 1 rating | Compatible with lead-free reflow profiles up to 260 °C peak; eliminates moisture-related popcorning during assembly. |
| Low profile DO-214AB | Height ≤2.6 mm - Supports compact power supply designs and reduces board-level mechanical stress near connectors or heatsinks. |
| Matte tin lead-free plating | RoHS and AOS Green compliant (halogen-free); meets IPC-J-STD-020 and JEDEC standards for solderability and corrosion resistance. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate driver ICs against voltage spikes induced by IGBT switching in 24 V DC bus inverters. IC Role / Device Role / Timing Role: Transient voltage suppressor placed between gate driver output and IGBT gate, clamping overshoot to ≤15.4 V. Use Value: Prevents gate oxide rupture and false turn-on by limiting transient voltage to 63% below typical IGBT gate absolute max rating (25 V). |
Use Scenario: Surge protection on LIN bus transceiver power pins exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Unidirectional TVS connected between 12 V supply and ground, absorbing 3000 W pulses per ISO 7637-2 Pulse 5a. Use Value: Maintains transceiver functionality during 120 V/50 ms load dump events by clamping supply rail to safe levels within 1 ps. |
| Telecom Power Feeds | Renewable Energy Inverters |
|
Use Scenario: Input-stage protection for PoE-powered devices subjected to Ethernet cable ESD and lightning-induced surges. IC Role / Device Role / Timing Role: TVS diode on 48 V DC input rail, placed upstream of DC-DC converter primary-side MOSFETs. Use Value: Limits clamping voltage to 15.4 V at 194.9 A, ensuring downstream converters remain within safe operating area during 10/1000 µs transients. |
Use Scenario: DC-link surge suppression in solar microinverters where PV string voltages reach 60–100 V under fault conditions. IC Role / Device Role / Timing Role: Unidirectional SMDJ9.0A used in parallel with higher-voltage TVS to extend clamping range across variable input conditions. Use Value: Provides precise low-voltage clamping headroom for auxiliary control circuitry powered from regulated 9 V rails derived from DC-link. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC9.0 | Same VRWM (9.0 V) and VC (15.4 V), but lower PPPM (1500 W); uses DO-214AC (SMA) package with higher RθJA (100 °C/W). | Limited to lower-energy surges (e.g., IEC 61000-4-2 ESD only); unsuitable for IEC 61000-4-5 line surge testing. | Select SMDJ9.0A when 3000 W pulse handling and DO-214AB thermal performance are required. |
| 1.5KE9.1A | Higher VRWM (9.1 V), same VBR range, but axial DO-201 package; RθJA ≈ 50 °C/W on FR4, no MSL1 rating. | Requires through-hole mounting and manual assembly; incompatible with high-volume SMT production and lead-free reflow. | Choose SMDJ9.0A for surface-mount automation, RoHS compliance, and superior thermal management on copper pads. |
Compared with SAC9.0 and 1.5KE9.1A, the SMDJ9.0A provides 100% higher peak pulse power, 25% lower thermal resistance on standard copper pads, and full MSL1 process compatibility - making it the preferred choice for high-reliability, high-volume industrial SMT designs requiring robust 3000 W surge immunity.
Availability
SMDJ9.0A is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom power feeds, and renewable energy inverters requiring stable component supply and guaranteed long-term availability.
Supply support for SMDJ9.0A 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 automotive markets.
The SMDJ series was developed for high-power surface-mount transient suppression in harsh environments, targeting applications demanding 3000 W pulse handling, low clamping voltage, and MSL1-compliant manufacturability.
FAQ
What is the clamping voltage of the SMDJ9.0A under maximum rated surge current?
The SMDJ9.0A has a maximum clamping voltage (VC) of 15.4 V when subjected to its peak pulse current (IPPM) of 194.9 A on a 10/1000 µs waveform. This value is measured at TJ = 25 °C with the device mounted on 8.0 mm × 8.0 mm copper pads - critical for verifying voltage margin against protected IC absolute maximum ratings in the SMDJ9.0A application circuit.
Is the SMDJ9.0A suitable for bidirectional surge protection?
No, the SMDJ9.0A is unidirectional only, with cathode marked by a band. For bidirectional protection at the same 9.0 V standoff level, the correct part is SMDJ9.0CA. Using SMDJ9.0A in AC or bipolar signal paths will result in forward conduction during negative half-cycles and potential failure - always verify polarity matching in the SMDJ9.0A design implementation.
What is the thermal resistance of the SMDJ9.0A, and how does it affect layout?
The SMDJ9.0A 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. Layout must replicate this pad size to achieve rated power derating; reducing pad area increases RθJA and risks exceeding TJ = 150 °C during repeated surges - a key constraint in SMDJ9.0A thermal design.
Does the SMDJ9.0A meet lead-free assembly requirements?
Yes, the SMDJ9.0A features matte tin lead-free plating and is rated MSL Level 1 per J-STD-020, supporting peak reflow temperatures up to 260 °C. It is RoHS and AOS Green compliant (halogen-free), making it suitable for modern SMT lines without requiring special moisture sensitivity handling - essential for consistent SMDJ9.0A manufacturing yield.
How does the SMDJ9.0A compare to the SMDJ8.5A in terms of voltage ratings?
The SMDJ9.0A has a higher reverse stand-off voltage (VRWM = 9.0 V) than the SMDJ8.5A (VRWM = 8.5 V), with corresponding VBR of 10.0–11.1 V versus 9.44–10.40 V. This 0.5 V increase allows use in 9 V nominal systems with tighter margin above operating voltage, while maintaining identical PPPM (3000 W) and package - a direct upgrade path in SMDJ9.0A system redesigns.
SMDJ9.0A 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):
- 9V
- Voltage - Breakdown (Min):
- 10V
- Voltage - Clamping (Max) @ Ipp:
- 15.4V
- Current - Peak Pulse (10/1000µs):
- 194.9A
- 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
SMDJ9.0A FAQ
1.How can I place an order for SMDJ9.0A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ9.0A 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 SMDJ9.0A reliable?
The price and inventory of SMDJ9.0A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ9.0A is usually 5 days.
3.What payment methods are accepted for SMDJ9.0A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ9.0A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ9.0A?
SMDJ9.0A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ9.0A 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 SMDJ9.0A?
For technical support, including SMDJ9.0A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ9.0A requirements.
6.How does Aetrix verify that SMDJ9.0A is sourced from the original manufacturer or authorized distributors?
All SMDJ9.0A 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 SMDJ9.0A meets industry standards.
7.What is the process for return or replacement of SMDJ9.0A?
All SMDJ9.0A units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ9.0A, 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 SMDJ9.0A part is unused and in its original packaging.
Return procedure for SMDJ9.0A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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