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Alpha & Omega Semiconductor Inc. SMDJ70A
- Part No.:
- SMDJ70A
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ70A.pdf
- Description:
- 1CH 70V UNIDIRECTIONAL 3000W SMD
- Quantity:
- Payment:
- Shipping:
Inventory:3,655
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Product details
Overview
SMDJ70A 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 70 V reverse standoff voltage (VRWM), 77.8–86.0 V breakdown voltage (VBR) at 1 mA, 113 A peak pulse current (IPP), 3000 W peak pulse power (10/1000 µs), and DO-214AB (SMC) surface-mount package - deployed in industrial motor drives to clamp lightning-induced transients on 48 V DC bus rails.
For engineers reviewing the SMDJ70A datasheet, pinout, applications, or equivalent options, key selection considerations include clamping voltage (113 V @ IPP), unidirectional polarity, thermal resistance (RθJA = 75 °C/W), JEDEC DO-214AB mechanical compatibility, and compliance with IEC 61000-4-5 surge immunity requirements.
Technical Context
The SMDJ70A operates as a silicon avalanche diode optimized for fast transient suppression on DC power rails. Its glass-passivated junction enables stable breakdown behavior, while its low-profile DO-214AB package supports automated SMT assembly and provides strain relief for mechanical reliability under thermal cycling.
It delivers sub-1 ps response time from 0 V to breakdown, handles 300 A non-repetitive forward surge (8.3 ms half-sine), and maintains ≤2.0 µA reverse leakage at VRWM - making it suitable for protecting sensitive downstream circuitry such as gate drivers, microcontroller I/O, and isolated DC/DC feedback paths without introducing parasitic capacitance or conduction loss during normal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 70 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 48–60 V systems. |
| VBR @ IT=1 mA | 77.8–86.0 V - Measured breakdown range ensures consistent avalanche initiation across production lots. |
| Vc @ IPP=113 A | 113 V - Clamping voltage under 3000 W 10/1000 µs surge; limits stress on protected ICs to safe levels. |
| PPPM | 3000 W - Peak pulse power rating per IEC 61000-4-5 Level 4 (4 kV surge); validates robustness against real-world lightning surges. |
| TJ max | +150 °C - Maximum junction temperature enabling operation in enclosed industrial enclosures with limited airflow. |
| RθJA | 75 °C/W - Thermal resistance from junction to ambient on standard 8 mm × 8 mm copper pads; informs heatsinking requirements. |
| IR @ VRWM | ≤2.0 µA - Low leakage preserves efficiency in high-impedance bias networks and battery-backed circuits. |
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; meets UL 94V-0 flammability and MSL1 reflow profile (260 °C peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or low-voltage return path; forms clamping loop with cathode during surge events. |
| Cathode | High-side surge input node | Connected to protected line (e.g., 48 V rail); avalanche conduction occurs when voltage exceeds VBR relative to anode. |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | <1.0 ps - Enables clamping before transient energy couples into downstream logic or analog circuitry. |
| Glass passivated junction | Stable VBR tolerance and long-term reliability under repeated surge stress without parameter drift. |
| Built-in strain relief | Reduces mechanical stress at lead-to-body interface during PCB flexure or thermal expansion cycles. |
| Low profile SMC package | Height ≤2.6 mm - Fits under low-clearance heatsinks and enables dense layout in space-constrained industrial modules. |
| MSL1 moisture sensitivity | Compatible with standard SMT reflow without baking; reduces manufacturing overhead and handling risk. |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
Use Scenario: Protecting 48 V DC bus inputs in variable-frequency drives against induced lightning surges from nearby AC mains or long cable runs. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between DC+ and chassis ground to shunt >3 kV transients away from IGBT gate drivers and current-sense amplifiers. Use Value: Limits clamped voltage to 113 V, ensuring downstream components rated for 120 V absolute maximum survive repeated 4 kV IEC 61000-4-5 surges. | Use Scenario: Safeguarding -48 V telecom rectifier outputs against load-dump transients during hot-swap of redundant power modules. IC Role / Device Role / Timing Role: Cathode tied to -48 V rail, anode to system ground; clamps positive-going spikes generated by inductive kickback during module insertion/removal. Use Value: Withstands 300 A 8.3 ms surge (IFSM) and maintains ≤2 µA leakage, preserving efficiency in always-on backup power systems. |
| Automotive Body Control Modules | Renewable Energy Inverters |
Use Scenario: Suppressing load dump transients on 12 V auxiliary rails powering microcontrollers and CAN transceivers in BCMs. IC Role / Device Role / Timing Role: TVS placed at power entry point upstream of LDO regulators; activated within 1 ps to prevent latch-up or ESD damage during ISO 7637-2 Pulse 5a events. Use Value: 70 V VRWM matches nominal 12 V system derated for cold-crank (up to 14 V) and load dump (up to 60 V), providing margin without over-clamping. | Use Scenario: Protecting MPPT controller inputs connected to photovoltaic string outputs exposed to outdoor lightning coupling. IC Role / Device Role / Timing Role: Mounted across PV+ and PV− terminals to clamp bidirectional surges; used in unidirectional configuration with external series blocking diode for polarity control. Use Value: 3000 W PPPM rating meets UL 1741 SA Category III surge requirements for rooftop solar installations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC70A (Littelfuse) | Same DO-214AB package, identical VRWM (70 V) and PPPM (3000 W), but VBR min/max tighter (77.8–82.2 V vs. 77.8–86.0 V). | Lower VBR spread improves consistency in multi-unit parallel configurations where voltage matching affects current sharing. | Select SAC70A when tighter VBR tolerance is required for redundancy-critical systems. |
| 1.5KE70A (ON Semiconductor) | Through-hole DO-201 package; same electrical specs but higher RθJA (~100 °C/W) and no MSL1 rating. | Not suitable for high-density SMT layouts or lead-free reflow processes requiring MSL1 compliance. | Choose 1.5KE70A only for legacy through-hole designs or prototyping where board space and reflow profile are not constraints. |
Compared with SAC70A and 1.5KE70A, the SMDJ70A offers superior manufacturability (MSL1, RoHS/halogen-free), lower thermal resistance on standard copper pads, and broader VBR tolerance that eases binning logistics - making it optimal for high-volume industrial SMT production.
Availability
SMDJ70A is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, automotive body control modules, and renewable energy inverters requiring stable component supply with full traceability and lifecycle management.
Supply support for SMDJ70A 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 SMDJxxxA series was developed specifically for high-power, surface-mount transient suppression in harsh-environment DC power systems - emphasizing rugged packaging, repeatable clamping, and compliance with international surge immunity standards.
FAQ
What is the clamping voltage of the SMDJ70A under a 3000 W surge?
The SMDJ70A clamps to a maximum of 113 V when subjected to its rated 3000 W peak pulse power (10/1000 µs waveform). This value is measured at IPP = 113 A and represents the upper limit of voltage seen by protected circuitry during worst-case surge events - critical for verifying margin against downstream component absolute maximum ratings in the SMDJ70A design-in process.
Is the SMDJ70A suitable for bidirectional surge protection?
No, the SMDJ70A is unidirectional. For bidirectional protection, the SMDJ70CA variant must be used - it shares the same VRWM (70 V) and PPPM (3000 W) but conducts symmetrically in both directions. The SMDJ70A's cathode band denotes polarity, and reverse connection will not provide clamping; using SMDJ70A in bidirectional applications risks device failure and unprotected transients.
What is the maximum steady-state power dissipation of the SMDJ70A?
The SMDJ70A is not rated for steady-state power dissipation; it is designed exclusively for transient suppression. Its datasheet specifies only pulsed ratings (PPPM, IPP, IFSM). Continuous DC power applied beyond VRWM will cause thermal runaway. The SMDJ70A must be used with appropriate series impedance (e.g., fuse, resistor, or inductor) to limit average power - sustained operation above VRWM violates its safe operating area and voids reliability guarantees for the SMDJ70A.
Does the SMDJ70A meet RoHS and halogen-free requirements?
Yes, the SMDJ70A is an AOS Green Product: fully RoHS compliant, lead-free, and halogen-free per IEC 61249-2-21. It carries the AOS Green logo and conforms to JEDEC MSL1 reflow standards (peak 260 °C), making it suitable for modern lead-free SMT assembly lines without requiring pre-bake - a verified specification for the SMDJ70A per AOS documentation Rev. 1.2.
How does the SMDJ70A compare to the older SMAJ70A in terms of surge capability?
The SMDJ70A delivers 3000 W peak pulse power, double the 1500 W rating of the SMAJ70A, due to its larger DO-214AB (SMC) package versus the smaller DO-214AC (SMA). This enables the SMDJ70A to handle higher-energy transients common in industrial 48 V systems, while maintaining identical VRWM and VBR specs - making the SMDJ70A a direct upgrade path where board space allows and higher surge immunity is required for the SMDJ70A application.
SMDJ70A 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):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 26.6A
- 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
SMDJ70A FAQ
1.How can I place an order for SMDJ70A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ70A 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 SMDJ70A reliable?
The price and inventory of SMDJ70A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ70A is usually 5 days.
3.What payment methods are accepted for SMDJ70A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ70A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ70A?
SMDJ70A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ70A 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 SMDJ70A?
For technical support, including SMDJ70A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ70A requirements.
6.How does Aetrix verify that SMDJ70A is sourced from the original manufacturer or authorized distributors?
All SMDJ70A 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 SMDJ70A meets industry standards.
7.What is the process for return or replacement of SMDJ70A?
All SMDJ70A units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ70A, 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 SMDJ70A part is unused and in its original packaging.
Return procedure for SMDJ70A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ70A Tags
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