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Alpha & Omega Semiconductor Inc. SMDJ48A
- Part No.:
- SMDJ48A
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ48A.pdf
- Description:
- 1CH 48V UNIDIRECTIONAL 3000W SMD
- Quantity:
- Payment:
- Shipping:
Inventory:8,402
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Product details
Overview
SMDJ48A 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 48 V reverse standoff voltage (VRWM), 53.3–58.9 V breakdown voltage (VBR) at 1 mA, 77.4 V maximum clamping voltage at 38.8 A peak pulse current, and 3000 W peak pulse power dissipation on a 10/1000 µs waveform - deployed in industrial motor drives to protect gate drivers from IGBT switching transients.
For engineers reviewing the SMDJ48A datasheet, pinout, applications, or equivalent options, key selection criteria include unidirectional polarity, DO-214AB package compatibility with high-current PCB layouts, clamping performance under repetitive 0.01% duty cycle surges, and thermal resistance (RθJL = 15 °C/W) for lead-mounted thermal management.
Technical Context
The SMDJ48A 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 (SMC J-bend) package supports automated placement and strain relief during thermal cycling.
Designed for single-polarity DC line protection, it delivers stable clamping under 10/1000 µs surge waveforms with 3000 W peak power rating when mounted on 8.0 mm × 8.0 mm copper pads. Its 2 µA max reverse leakage at VRWM ensures minimal standby power loss in always-on systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 48.0 V - Maximum continuous reverse operating voltage before significant leakage; sets DC bus protection threshold. |
| VBR @ IT=1 mA | 53.3–58.9 V - Confirmed avalanche onset range; ensures predictable turn-on during overvoltage events. |
| Vc @ IPPM | 77.4 V - Clamped voltage at 38.8 A peak pulse; defines worst-case stress on downstream ICs. |
| PPPM (10/1000 µs) | 3000 W - Peak surge energy handling capacity; supports IEC 61000-4-5 Level 4 compliance with proper layout. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in enclosed industrial enclosures without active cooling. |
| RθJL | 15 °C/W - Thermal resistance junction-to-lead; allows direct heat conduction to PCB copper for sustained surge duty. |
| Polarity | Unidirectional - Cathode-band marked; requires correct orientation in series with positive rail for DC line protection. |
Pinout & Package
DO-214AB (SMC J-bend) surface-mount package with molded plastic case, matte tin lead-free plating, and cathode band marking. Terminals are solderable per MIL-STD-750, Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | DC return path / ground reference | Connected to system ground or low-side return; completes clamping path during transient. |
| Cathode | Protected line input / high-side connection | Connected to protected DC rail (e.g., +48 V supply); avalanche conduction occurs from cathode to anode. |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | <1.0 ps - Enables suppression of ESD and lightning-induced edges before sensitive logic or analog circuitry responds. |
| Glass passivated junction | Stable VBR tolerance and long-term reliability - Resists moisture ingress and electrochemical degradation in humid environments. |
| Built-in strain relief | Reduces mechanical stress on solder joints - Critical for automotive and industrial applications subject to vibration and thermal cycling. |
| MSL1 rating | Reflow-compatible up to 260 °C peak - Supports standard lead-free assembly without pre-baking or special handling. |
| UL 94V-0 flammability | Self-extinguishing plastic housing - Meets safety requirements for enclosed power supplies and industrial controllers. |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
Use Scenario: Protection of 48 V DC bus against IGBT commutation spikes and load dump transients in servo amplifier modules. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed across DC link capacitor to clamp voltage overshoots exceeding 77.4 V. Use Value: Prevents gate oxide damage to isolated gate drivers (e.g., ISO5852S) by limiting transient voltage within safe SOA limits. | Use Scenario: Input-stage surge suppression in -48 V telecom rectifier systems exposed to lightning-induced surges on distribution lines. IC Role / Device Role / Timing Role: Primary clamping device on feed line prior to DC/DC converter input filter. Use Value: Absorbs 3000 W surges per IEC 61000-4-5 Combination Wave test without degradation, maintaining system uptime. |
| Automotive Body Control Modules | Renewable Energy Inverters |
Use Scenario: Protection of LIN bus transceivers and microcontroller I/O pins against battery load dump pulses in 12 V subsystems. IC Role / Device Role / Timing Role: Secondary-level TVS on local 12 V rail derived from main battery via LDO or buck regulator. Use Value: Withstands 300 A peak surge (IFSM = 300 A, 8.3 ms half-sine) without fuse activation or board-level failure. | Use Scenario: DC-side transient suppression in solar string inverters where PV arrays generate high-voltage surges during rapid cloud transitions. IC Role / Device Role / Timing Role: Parallel-connected TVS on MPPT input stage rated for 48 V nominal string voltage. Use Value: Maintains clamping performance across -40 °C to +150 °C ambient, supporting outdoor deployment without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC48A (Littelfuse) | Same DO-214AB package, identical VRWM (48 V), but lower PPPM (1500 W) and higher Vc (80.0 V @ 37.5 A). | Limited to lower-energy surge environments; not suitable for IEC 61000-4-5 Level 4 without parallel staging. | Select when cost sensitivity outweighs peak surge margin and layout space permits dual-device implementation. |
| 1.5KE48A (ON Semiconductor) | Through-hole DO-201 package, same electrical specs (VRWM = 48 V, VBR = 53.3–58.9 V), but no MSL1 rating and higher RθJA (75 °C/W vs. SMDJ48A's 75 °C/W with pad optimization). | Requires manual or wave soldering; incompatible with high-density SMT production and reflow-only processes. | Choose only for legacy through-hole designs or prototyping where board real estate is unconstrained. |
Compared with SAC48A and 1.5KE48A, the SMDJ48A provides superior surge robustness (3000 W vs. 1500 W/1500 W), SMT scalability, and thermal performance in compact layouts - making it optimal for modern industrial and telecom power systems requiring automated assembly and high-reliability field operation.
Availability
SMDJ48A 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, full RoHS and halogen-free compliance, and traceable green manufacturing.
Supply support for SMDJ48A 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 DC power rails - emphasizing rugged packaging, tight VBR tolerance, and repeatable clamping under repetitive surge conditions.
FAQ
What is the maximum clamping voltage of the SMDJ48A under a 10/1000 µs surge?
The SMDJ48A has a maximum clamping voltage (VC) of 77.4 V at its rated peak pulse current of 38.8 A on a 10/1000 µs waveform. This value is measured under standardized test conditions with the device mounted on 8.0 mm × 8.0 mm copper pads per JEDEC guidelines. The SMDJ48A maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C), ensuring consistent protection in demanding environments.
Is the SMDJ48A RoHS and halogen-free compliant?
Yes, the SMDJ48A 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 finish and halogen-free molding compound meet IPC/JEDEC J-STD-609 Category 1 requirements. Documentation confirming SMDJ48A compliance is available in AOS' official Green Policy document (AOSGreenPolicy.pdf) and on the manufacturer's website.
Can the SMDJ48A be used in bidirectional configurations?
No, the SMDJ48A is a unidirectional TVS diode and must be oriented with its cathode band toward the protected line. For bidirectional protection at 48 V, the designated variant is SMDJ48CA - which uses a different internal structure and marking code (DFX). Using SMDJ48A in reverse-biased configuration will not provide symmetrical clamping and may result in catastrophic failure under AC or bipolar surge conditions.
What is the thermal resistance junction-to-ambient for the SMDJ48A?
The typical thermal resistance junction-to-ambient (RθJA) for the SMDJ48A is 75 °C/W when mounted on standard FR-4 PCB with minimum copper area. However, this value improves significantly with enhanced thermal design: using 8.0 mm × 8.0 mm copper pads reduces RθJA to approximately 40 °C/W, while the junction-to-lead resistance (RθJL) remains fixed at 15 °C/W - enabling efficient heat transfer directly into the PCB plane. This makes the SMDJ48A suitable for high-duty-cycle surge environments when properly laid out.
Does the SMDJ48A meet any specific industry surge immunity standards?
The SMDJ48A is engineered to support compliance with IEC 61000-4-5 (surge immunity) Level 4 (4 kV line-to-earth, 2 kV line-to-line) when implemented with appropriate PCB layout - including short traces, symmetric grounding, and adequate copper pour. While the device itself is not certified to the standard, its 3000 W peak pulse power rating, 38.8 A IPPM, and 77.4 V clamping voltage align with the energy absorption requirements for Level 4 testing. System-level validation of SMDJ48A remains the responsibility of the end designer per AOS' legal disclaimer.
SMDJ48A 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):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 77.4V
- Current - Peak Pulse (10/1000µs):
- 38.8A
- 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
SMDJ48A FAQ
1.How can I place an order for SMDJ48A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ48A 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 SMDJ48A reliable?
The price and inventory of SMDJ48A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ48A is usually 5 days.
3.What payment methods are accepted for SMDJ48A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ48A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ48A?
SMDJ48A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ48A 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 SMDJ48A?
For technical support, including SMDJ48A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ48A requirements.
6.How does Aetrix verify that SMDJ48A is sourced from the original manufacturer or authorized distributors?
All SMDJ48A 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 SMDJ48A meets industry standards.
7.What is the process for return or replacement of SMDJ48A?
All SMDJ48A units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ48A, 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 SMDJ48A part is unused and in its original packaging.
Return procedure for SMDJ48A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ48A Tags
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