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Alpha & Omega Semiconductor Inc. SMDJ64A
- Part No.:
- SMDJ64A
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ64A.pdf
- Description:
- 1CH 64V UNIDIRECTIONAL 3000W SMD
- Quantity:
- Payment:
- Shipping:
Inventory:9,346
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Product details
Overview
SMDJ64A from Alpha & Omega Semiconductor is a unidirectional transient voltage suppressor diode (TVS) designed for high-energy surge protection in DC power lines and signal interfaces. It features a 64 V reverse standoff voltage (VRWM), 71.1–78.6 V breakdown voltage (VBR) at 1 mA, 103 A peak pulse current (IPP), and 3000 W peak pulse power (PPPM) on 10/1000 µs waveform - deployed in industrial motor drives to clamp lightning-induced transients on 48 V DC bus rails.
For engineers reviewing the SMDJ64A datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage (103 V @ IPP), unidirectional polarity, DO-214AB package thermal resistance (RθJL = 15 °C/W), and compliance with IEC 61000-4-5 Level 4 surge immunity requirements.
Technical Context
The SMDJ64A operates as a silicon avalanche diode with glass-passivated junction and low-profile DO-214AB (SMC J-Bend) surface-mount package. Its fast response time (<1.0 ps) enables sub-nanosecond clamping onset, while its 150 °C maximum junction temperature and MSL1 moisture sensitivity level support reflow-compatible assembly.
Designed for single-polarity surge suppression, 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. Its 2.0 µA maximum reverse leakage at VRWM ensures minimal standby power loss in always-on systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 64 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC rail margin for 48 V systems. |
| VBR (min/max) | 71.1 V / 78.6 V @ 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during overvoltage events. |
| Vc @ IPP | 103 V - Clamping voltage at 103 A peak pulse; determines worst-case voltage seen by downstream ICs. |
| PPPM | 3000 W - Peak pulse power handling on 10/1000 µs waveform; supports IEC 61000-4-5 Level 4 (4 kV/2 Ω) testing. |
| IR @ VRWM | 2.0 µA - Reverse leakage current at 64 V; enables low-power standby operation without excessive quiescent drain. |
| TJ max | 150 °C - Maximum junction temperature; allows operation in enclosed industrial enclosures with limited airflow. |
| RθJL | 15 °C/W - Junction-to-lead thermal resistance; supports high-reliability power dissipation with proper PCB copper pad layout. |
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; terminals are solderable per MIL-STD-750, Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to system ground or lower-potential node in unidirectional TVS configuration. |
| Cathode | Current exit terminal; marked with color band | Connected to protected line (e.g., 48 V DC bus); clamps to anode when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | <1.0 ps - Enables clamping before transient energy couples into sensitive circuitry. |
| Glass passivated junction | Enhanced reliability and stable VBR over temperature and lifetime vs. epoxy-passivated alternatives. |
| Built-in strain relief | Reduces mechanical stress on solder joints during thermal cycling or board flexure. |
| MSL1 rating | Compatible with standard Pb-free reflow profiles up to 260 °C peak, eliminating pre-bake requirements. |
| UL 94V-0 flammability | Self-extinguishing plastic housing meets safety standards for enclosed industrial equipment. |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
Use Scenario: Protection of 48 V DC bus against lightning-induced surges in variable-frequency drives. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed across input terminals to shunt transient energy to ground. Use Value: Limits clamped voltage to 103 V, preventing damage to IGBT gate drivers and MCU power rails rated for 120 V absolute maximum. | Use Scenario: Input-stage surge suppression in -48 V telecom rectifier modules compliant with GR-1089-CORE. IC Role / Device Role / Timing Role: Primary-level TVS connected between -48 V rail and chassis ground. Use Value: Withstands 3000 W pulses and maintains <2 µA leakage, preserving efficiency in always-on backup power systems. |
| Automotive Body Control Modules | Renewable Energy Inverters |
Use Scenario: CAN bus power line protection in 12 V/24 V vehicle subsystems exposed to load dump transients. IC Role / Device Role / Timing Role: Standoff-rated TVS on battery-fed 24 V supply feeding BCM microcontrollers. Use Value: 64 V VRWM provides 2× margin above nominal 24 V, while 103 V clamping protects 33 V-rated LDOs and CAN transceivers. | Use Scenario: DC-link surge protection in solar string inverters interfacing with 600–1000 V PV arrays. IC Role / Device Role / Timing Role: Secondary-level TVS on intermediate DC bus prior to H-bridge stage. Use Value: 3000 W PPPM rating handles repetitive switching transients and grid-coupled surge events without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC64A (Littelfuse) | Same VRWM (64 V), but lower PPPM (1500 W); Vc = 107 V @ IPP. | Rated for lower-energy transients; not suitable for IEC 61000-4-5 Level 4. | Select only where system-level surge test requirement is ≤2 kV. |
| 1.5KE68A (ON Semiconductor) | Through-hole DO-201 package; identical electrical specs but higher RθJA (75 °C/W vs. 15 °C/W). | Requires larger PCB area and cannot meet high-density SMT layouts. | Choose only if legacy through-hole assembly is mandated or thermal pad access is unavailable. |
Compared with SAC64A and 1.5KE68A, the SMDJ64A delivers double the peak pulse power in a space-saving surface-mount package with superior thermal performance - enabling compact, high-reliability surge protection in modern industrial and telecom designs.
Availability
SMDJ64A is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, and automotive body control modules requiring stable component supply and full traceability.
Supply support for SMDJ64A 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 markets.
The SMDJ series is part of AOS's transient voltage suppressor portfolio, engineered specifically for high-power, surface-mount surge protection in harsh environments with stringent thermal and reliability demands.
FAQ
What is the clamping voltage of the SMDJ64A and how is it measured?
The SMDJ64A has a maximum clamping voltage (Vc) of 103 V, measured at its rated peak pulse current (IPP) of 103 A under the standardized 10/1000 µs waveform. This value is confirmed per JEDEC test conditions with the device mounted on 8.0 mm × 8.0 mm copper pads. The clamping voltage directly determines the maximum stress imposed on downstream components during surge events, making it critical for validating protection margins in the SMDJ64A application circuit.
Is the SMDJ64A RoHS and halogen-free compliant?
Yes, the SMDJ64A is fully RoHS compliant and part of AOS' Green Product initiative, meaning it contains no lead, brominated flame retardants, or chlorine-based compounds. Its matte tin lead-free plating and UL 94V-0 rated plastic package meet global environmental and safety regulations including EU RoHS Directive 2011/65/EU and IEC 61249-2-21.
Can the SMDJ64A be used in bidirectional configurations?
No - the SMDJ64A is strictly unidirectional. For bidirectional operation, the designated variant is SMDJ64CA, which features symmetrical breakdown characteristics in both polarities. Using SMDJ64A in reverse-biased AC or bipolar signal paths will result in unintended conduction and potential failure; always verify polarity marking (cathode band) and select the CA suffix for bidirectional applications.
What is the thermal resistance specification for the SMDJ64A and why does it matter?
The SMDJ64A has a typical junction-to-lead thermal resistance (RθJL) of 15 °C/W, measured under JEDEC-standard mounting conditions. This low value enables efficient heat transfer from the silicon die to the PCB copper pads, allowing sustained surge handling without exceeding the 150 °C maximum junction temperature. Proper 8.0 mm × 8.0 mm pad design is essential to realize this thermal performance in the SMDJ64A layout.
Does the SMDJ64A require derating at elevated ambient temperatures?
Yes - the SMDJ64A's peak pulse power must be derated linearly above 25 °C ambient, following the published pulse derating curve: at 100 °C TA, PPPM is reduced to ~65% of its 25 °C rating (≈1950 W). This derating ensures junction temperature remains within the 150 °C limit during repeated surge events and must be factored into thermal design validation for the SMDJ64A in high-temperature enclosures.
SMDJ64A 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):
- 64V
- Voltage - Breakdown (Min):
- 71.1V
- Voltage - Clamping (Max) @ Ipp:
- 103V
- Current - Peak Pulse (10/1000µs):
- 29.2A
- 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
SMDJ64A FAQ
1.How can I place an order for SMDJ64A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ64A 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 SMDJ64A reliable?
The price and inventory of SMDJ64A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ64A is usually 5 days.
3.What payment methods are accepted for SMDJ64A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ64A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ64A?
SMDJ64A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ64A 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 SMDJ64A?
For technical support, including SMDJ64A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ64A requirements.
6.How does Aetrix verify that SMDJ64A is sourced from the original manufacturer or authorized distributors?
All SMDJ64A 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 SMDJ64A meets industry standards.
7.What is the process for return or replacement of SMDJ64A?
All SMDJ64A units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ64A, 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 SMDJ64A part is unused and in its original packaging.
Return procedure for SMDJ64A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ64A Tags
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