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Alpha & Omega Semiconductor Inc. SMDJ48CA
- Part No.:
- SMDJ48CA
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ48CA.pdf
- Description:
- 1CH 48V BIDIRECTIONAL 3000W SMD
- Quantity:
- Payment:
- Shipping:
Inventory:6,678
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Product details
Overview
SMDJ48CA from Alpha & Omega Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, rated for 48 V reverse standoff voltage (VRWM), 53.3–58.9 V breakdown voltage (VBR), 77.4 V maximum clamping voltage (VC) at 38.8 A peak pulse current, and 3000 W peak pulse power on 10/1000 µs waveform - used to protect DC power rails and I/O lines in industrial motor drives and telecom power supplies.
For engineers reviewing the SMDJ48CA datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VRWM ≈ 1.61), JEDEC-compliant DO-214AB thermal performance (RθJA = 75 °C/W), and compliance with J-STD-020 MSL Level 1 reflow profile.
Technical Context
The SMDJ48CA operates as a silicon avalanche diode with glass-passivated junction and bidirectional symmetry - enabling identical clamping behavior in both polarities without external circuit inversion. Its fast response time (<1.0 ps) ensures protection against ESD and lightning-induced transients before sensitive downstream ICs are damaged.
Designed for surface-mount use on 8.0 mm × 8.0 mm copper pads per terminal, it delivers 3000 W surge handling under non-repetitive 10/1000 µs pulses at TA = 25 °C, with thermal derating to ~1800 W at 85 °C ambient and full derating above 125 °C per the published pulse derating curve.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 48.0 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC rail margin for 48 V systems. |
| VBR min/max | 53.3 V / 58.9 V @ 1 mA - Confirmed avalanche onset range; ensures predictable turn-on across manufacturing lot and temperature. |
| VC @ IPPM | 77.4 V @ 38.8 A - Clamped voltage during 3000 W transient; determines protected circuit's maximum overvoltage stress. |
| PPPM | 3000 W - Peak pulse power rating on standard 10/1000 µs waveform; benchmark for surge immunity compliance (e.g., IEC 61000-4-5). |
| TJ max | +150 °C - Maximum junction temperature; enables operation in high-ambient industrial environments with appropriate PCB copper area. |
| Polarity | Bidirectional - Symmetrical clamping in both directions; eliminates need for polarity-aware layout or external series components. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on standard 8 mm² copper pad; informs heatsinking requirements for sustained surge duty. |
Pinout & Package
DO-214AB (SMC J-Bend) surface-mount package: molded plastic case with matte tin lead-free plating, JEDEC-compliant outline, and cathode band marking for unidirectional variants; bidirectional SMDJ48CA has no polarity marking and functions identically in either orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals serve as interchangeable surge current entry/exit points; no functional distinction in bidirectional mode. |
| Case | Mechanical mounting surface | Non-electrical; provides strain relief and thermal conduction path to PCB copper via soldered leads. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable VBR tolerance and long-term reliability under repeated surge stress without degradation. |
| MSL Level 1 rating | Supports single-reflow assembly at peak 260 °C without moisture-induced popcorning or delamination. |
| UL 94V-0 flammability | Plastic housing meets stringent fire-safety standards for enclosed industrial and telecom equipment. |
| 0.01% repetition rate limit | Specifies maximum allowable duty cycle for repetitive surges; requires ≥100 s recovery between 3000 W events. |
| Low-profile SMC package | Height ≤ 2.6 mm enables compact placement near connectors or power inputs without mechanical interference. |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
Use Scenario: Protection of 48 V DC bus against load dump and inductive switching transients in servo drive control modules. IC Role / Device Role / Timing Role: Bidirectional TVS clamping device placed directly across input terminals to shunt surge energy before reaching DC-DC converters and gate drivers. Use Value: Limits transient overvoltage to ≤77.4 V, preserving MOSFET gate oxide integrity and preventing false triggering of overvoltage protection circuits. | Use Scenario: Input-stage surge suppression on -48 V telecom rectifier outputs feeding shelf-level distribution boards. IC Role / Device Role / Timing Role: Primary transient suppressor at system entry point, coordinated with upstream MOVs and downstream ceramic capacitors for multi-stage filtering. Use Value: Withstands 3000 W IEC 61000-4-5 Combination Wave surges while maintaining <2 µA leakage at 48 V, minimizing standby power loss. |
| Automotive Body Control Modules | Industrial PLC I/O Cards |
Use Scenario: CAN FD and LIN bus line protection in 12 V/24 V vehicle subsystems where bidirectional signaling requires symmetrical clamping. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential pairs to clamp common-mode transients without disrupting signal integrity. Use Value: Matches bidirectional data line polarity; clamps ±77.4 V peaks without forward conduction, preserving bus timing margins and noise immunity. | Use Scenario: Digital input protection on 24 V dry-contact interfaces exposed to field-wiring induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: First-line protector mounted adjacent to terminal block to absorb induced lightning energy before reaching optocoupler input stages. Use Value: Fast <1 ps response ensures clamping initiates before 24 V logic-level shifters experience latch-up, reducing field failure rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC48CA (Littelfuse) | Same VRWM (48 V), slightly higher VC (79.0 V @ 38.5 A), identical DO-214AB package and MSL1 rating. | Identical bidirectional clamping function; minor VC difference may affect margin in tightly regulated 48 V systems. | Select SAC48CA if dual-sourcing is required and 1.6 V higher clamping voltage is acceptable within system OV threshold. |
| SMCJ48CA (ON Semiconductor) | Same VRWM (48 V), identical VC (77.4 V @ 38.8 A), same DO-214AB package and 3000 W rating; VBR tolerance tighter (53.3–57.1 V vs. 53.3–58.9 V). | Drop-in replacement with improved VBR consistency; validated for same IEC 61000-4-5 Class 3/4 test profiles. | Choose SMCJ48CA when tighter VBR distribution improves design margin for precise overvoltage detection thresholds. |
Compared with SMDJ48CA, SAC48CA offers equivalent surge rating but slightly reduced clamping margin, while SMCJ48CA provides tighter VBR control and identical clamping performance - making it a preferred drop-in alternative where VBR consistency is critical for system-level fault detection calibration.
Availability
SMDJ48CA is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, and automotive body control modules requiring stable component supply, RoHS-compliant packaging, and traceable sourcing for long-lifecycle programs.
Supply support for SMDJ48CA 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/CA series was designed specifically for high-power transient suppression in harsh-environment DC systems, emphasizing robustness, tight parameter distribution, and compatibility with automated SMT assembly processes.
FAQ
What is the clamping voltage of the SMDJ48CA under a 3000 W transient?
The SMDJ48CA clamps to 77.4 V at 38.8 A peak pulse current, corresponding to a 3000 W 10/1000 µs waveform. This value is measured and guaranteed per the datasheet's electrical characteristics table and defines the maximum voltage imposed on protected circuitry during surge events.
Is the SMDJ48CA unidirectional or bidirectional?
The SMDJ48CA is a bidirectional TVS diode, meaning it provides symmetrical clamping in both polarities. Unlike unidirectional variants (e.g., SMDJ48A), the CA suffix explicitly denotes bidirectional functionality, with identical VBR, VC, and IR specifications in either direction.
What is the maximum operating temperature for the SMDJ48CA?
The SMDJ48CA has a maximum junction temperature (TJ max) of +150 °C and an operating junction/storage temperature range of –55 °C to +150 °C. Derating of peak pulse power begins above 25 °C ambient, falling to approximately 1800 W at 85 °C per the published pulse derating curve.
Does the SMDJ48CA meet lead-free and RoHS requirements?
Yes, the SMDJ48CA is a Green Product per AOS policy: it is lead-free, RoHS compliant, and halogen-free. It features matte tin lead-free plating and conforms to J-STD-020 MSL Level 1 reflow standards with a maximum peak temperature of 260 °C.
What package type does the SMDJ48CA use, and what are its mechanical dimensions?
The SMDJ48CA uses the DO-214AB (SMC J-Bend) package: a surface-mount plastic case measuring 7.11 mm × 6.22 mm × 2.62 mm (L × W × H) with J-bend leads. Mechanical data confirms JEDEC-compliant molding and solderability per MIL-STD-750 Method 2026.
SMDJ48CA 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:
- -
- Bidirectional Channels:
- 1
- 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
SMDJ48CA FAQ
1.How can I place an order for SMDJ48CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ48CA 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 SMDJ48CA reliable?
The price and inventory of SMDJ48CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ48CA is usually 5 days.
3.What payment methods are accepted for SMDJ48CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ48CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ48CA?
SMDJ48CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ48CA 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 SMDJ48CA?
For technical support, including SMDJ48CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ48CA requirements.
6.How does Aetrix verify that SMDJ48CA is sourced from the original manufacturer or authorized distributors?
All SMDJ48CA 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 SMDJ48CA meets industry standards.
7.What is the process for return or replacement of SMDJ48CA?
All SMDJ48CA units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ48CA, 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 SMDJ48CA part is unused and in its original packaging.
Return procedure for SMDJ48CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ48CA Tags
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