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Alpha & Omega Semiconductor Inc. SMDJ11A
- Part No.:
- SMDJ11A
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ11A.pdf
- Description:
- 1CH 11V UNIDIRECTIONAL 3000W SMD
- Quantity:
- Payment:
- Shipping:
Inventory:6,307
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Product details
Overview
SMDJ11A from Alpha & Omega Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy surge protection in DC power lines and signal interfaces. It features a 11.0 V reverse stand-off voltage (VRWM), 12.2–13.5 V breakdown voltage (VBR) at 1 mA, 18.2 V maximum clamping voltage (VC) at 164.9 A peak pulse current, and 3000 W peak pulse power rating on a 10/1000 µs waveform - deployed in industrial power supplies and automotive ECUs.
For engineers reviewing the SMDJ11A datasheet, pinout, applications, or equivalent options, key selection criteria include clamping performance under 10/1000 µs surges, thermal resistance (RθJL = 15 °C/W), unidirectional polarity with cathode band marking, and DO-214AB package compatibility with automated SMT assembly.
Technical Context
The SMDJ11A operates as a silicon avalanche diode optimized for fast transient suppression. Its glass-passivated junction enables sub-1 ps response time from 0 V to breakdown, while its low-profile DO-214AB package supports high-density PCB layouts. The device meets MSL Level 1 per J-STD-020 and is rated for junction temperatures up to +150 °C.
It delivers repeatable clamping with ≤0.1 %/°C temperature coefficient of VBR and exhibits 2.0 µA maximum reverse leakage at VRWM. Thermal design relies on 8.0 mm × 8.0 mm copper pads per terminal to achieve specified RθJA = 75 °C/W and sustain 3000 W peak pulse power without thermal runaway.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 11.0 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR @ IT=1 mA | 12.2–13.5 V - Confirmed avalanche onset range ensuring predictable turn-on margin |
| VC @ IPPM | 18.2 V - Clamped voltage at 164.9 A, limiting downstream IC stress during surge events |
| PPPM (10/1000 µs) | 3000 W - Peak surge energy handling capacity with defined waveform compliance |
| RθJL | 15 °C/W - Junction-to-lead thermal resistance enabling efficient heat transfer to PCB copper |
| IR @ VRWM | 2.0 µA - Low leakage ensures minimal standby power loss in always-on circuits |
| TJ max | +150 °C - Maximum junction temperature supporting operation in under-hood or enclosed industrial environments |
Pinout & Package
DO-214AB (SMC J-Bend) package: molded plastic case with matte tin lead-free plating; cathode indicated by color band; terminals solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to protected circuit ground or low-side return | Provides low-impedance path to ground during reverse-transient clamping |
| Cathode | Protected line connection; marked with color band | Receives surge voltage; avalanche conduction occurs when VRWM exceeded |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | <1.0 ps from 0 V to BV - minimizes voltage overshoot before clamping engages |
| Glass passivated junction | Enhances long-term reliability and stability of VBR under thermal cycling |
| Built-in strain relief | Reduces mechanical stress at lead-to-body interface during board flex or thermal expansion |
| MSL Level 1 rating | Enables reflow at peak 260 °C without moisture-induced popcorn failure |
| UL 94V-0 flammability | Plastic housing self-extinguishes to prevent fire propagation in overvoltage fault conditions |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of 12 V DC input rails against load dump and ISO 7637-2 Pulse 5a transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery feed and DC-DC converter input. Use Value: Clamps 18.2 V at 164.9 A, preventing damage to downstream PMICs and microcontrollers during 3000 W surge events. | Use Scenario: Surge suppression on LIN bus power lines exposed to ESD and coupled noise. IC Role / Device Role / Timing Role: Standoff protection element on 12 V supply rail feeding LIN transceivers. Use Value: Sub-1 ps response ensures clamping before transceiver latch-up, with 2.0 µA leakage preserving sleep-mode current budget. |
| Telecom Power Feeds | Renewable Energy Inverters |
Use Scenario: Input-stage protection for PoE-powered remote units subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Primary surge clamp on 48 V DC input before DC-DC isolation stage. Use Value: 3000 W rating handles multi-kW induced surges; DO-214AB footprint allows compact layout near connector entry point. | Use Scenario: DC link protection in solar string inverters where PV array transients exceed 100 V. IC Role / Device Role / Timing Role: Secondary-level clamping on intermediate DC bus after main MOV stage. Use Value: Tight VBR tolerance (12.2–13.5 V) enables precise coordination with upstream protectors; RθJL = 15 °C/W supports sustained operation at 75 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC11A (Littelfuse) | Same DO-214AB package; 11 V VRWM; 18.2 V VC @ 165 A; 3000 W rating; ±5 % VBR tolerance vs. SMDJ11A's ±5.5 % | Identical placement in 12 V DC lines; identical thermal pad requirements | Select SAC11A if tighter VBR tolerance and legacy Littelfuse qualification are required |
| 1.5SMC11A (ON Semiconductor) | DO-214AB package; 11 V VRWM; 18.2 V VC @ 165 A; 3000 W rating; 1.0 µA IR vs. SMDJ11A's 2.0 µA | Drop-in replacement in existing SMC footprints; same JEDEC-compliant mounting | Choose 1.5SMC11A for lower leakage in ultra-low-power monitoring circuits |
Compared with SAC11A and 1.5SMC11A, the SMDJ11A offers balanced trade-offs: slightly higher leakage than 1.5SMC11A but superior thermal resistance (RθJL = 15 °C/W), and broader VBR tolerance than SAC11A while maintaining identical clamping performance and surge rating - making it optimal for cost-sensitive industrial designs requiring robust thermal management.
Availability
SMDJ11A is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power feeds requiring stable component supply across extended production cycles and global manufacturing sites.
Supply support for SMDJ11A 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 protection.
The SMDJ series is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where 3000 W surge immunity and MSL1 reflow compatibility are mandatory.
FAQ
What is the clamping voltage of the SMDJ11A under a 10/1000 µs surge?
The SMDJ11A has a maximum clamping voltage (VC) of 18.2 V at 164.9 A peak pulse current on a 10/1000 µs waveform. This value is measured under standardized test conditions with 8.0 mm × 8.0 mm copper pads per terminal and defines the upper voltage limit imposed on protected circuitry during transient events. The SMDJ11A maintains this clamping performance consistently due to its glass-passivated avalanche junction structure.
Is the SMDJ11A RoHS and halogen-free compliant?
Yes, the SMDJ11A is an AOS Green Product: fully RoHS compliant, lead-free, and halogen-free per IEC 61249-2-21. It meets UL 94V-0 flammability standards and carries AOS' reduced-halogen certification. The matte tin lead finish and DO-214AB molding compound are both qualified to these environmental specifications - confirmed in AOS' official Green Policy document.
Does the SMDJ11A have bidirectional capability?
No, the SMDJ11A is strictly unidirectional. Its cathode is marked with a color band and it conducts only when reverse-biased beyond VRWM. For bidirectional operation, the correct variant is SMDJ11CA - which shares the same VRWM and clamping characteristics but functions symmetrically in both polarities. Using SMDJ11A in AC or bipolar signal paths will result in forward conduction and potential failure.
What is the thermal resistance from junction to ambient for the SMDJ11A?
The SMDJ11A 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. This value assumes standard JEDEC test conditions and is critical for calculating steady-state temperature rise. For higher power derating, designers must use the published pulse derating curve and consider board layout, airflow, and adjacent heat sources - all validated in the SMDJ11A datasheet Figure 6.
Can the SMDJ11A be used in automotive load dump protection?
Yes, the SMDJ11A is suitable for automotive load dump protection on 12 V systems, meeting ISO 7637-2 Pulse 5a requirements when properly laid out. Its 3000 W peak pulse power rating, 18.2 V clamping voltage, and +150 °C TJ max enable reliable operation in under-hood environments. However, system-level validation is required - including coordination with upstream fuses and verification of total clamping margin relative to downstream IC absolute maximum ratings.
SMDJ11A 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):
- 11V
- Voltage - Breakdown (Min):
- 12.2V
- Voltage - Clamping (Max) @ Ipp:
- 18.2V
- Current - Peak Pulse (10/1000µs):
- 164.9A
- 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
SMDJ11A FAQ
1.How can I place an order for SMDJ11A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ11A 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 SMDJ11A reliable?
The price and inventory of SMDJ11A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ11A is usually 5 days.
3.What payment methods are accepted for SMDJ11A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ11A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ11A?
SMDJ11A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ11A 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 SMDJ11A?
For technical support, including SMDJ11A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ11A requirements.
6.How does Aetrix verify that SMDJ11A is sourced from the original manufacturer or authorized distributors?
All SMDJ11A 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 SMDJ11A meets industry standards.
7.What is the process for return or replacement of SMDJ11A?
All SMDJ11A units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ11A, 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 SMDJ11A part is unused and in its original packaging.
Return procedure for SMDJ11A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ11A Tags
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