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Alpha & Omega Semiconductor Inc. SMDJ51CA
- Part No.:
- SMDJ51CA
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ51CA.pdf
- Description:
- 1CH 51V BIDIRECTIONAL 3000W SMD
- Quantity:
- Payment:
- Shipping:
Inventory:7,448
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Product details
Overview
SMDJ51CA from Alpha & Omega Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, designed for high-energy surge protection in DC power lines and data interfaces. It features 51.0 V reverse stand-off voltage (VRWM), 56.7–62.7 V breakdown voltage (VBR) at 1 mA, 82.4 V maximum clamping voltage (VC) at 36.5 A peak pulse current, and 3000 W peak pulse power rating on 10/1000 µs waveform.
For engineers reviewing the SMDJ51CA datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional clamping capability, low leakage (<2.0 µA @ VRWM), fast sub-1 ps response time, and compatibility with automated SMT assembly per J-STD-020 MSL Level 1.
Technical Context
The SMDJ51CA operates as a silicon avalanche diode with glass-passivated junction, delivering symmetrical clamping in both polarities - critical for protecting AC-coupled or floating signal paths. Its thermal resistance (RθJA = 75 °C/W, RθJL = 15 °C/W) enables reliable operation up to 150 °C junction temperature when mounted on 8.0 mm × 8.0 mm copper pads.
It meets UL 94V-0 flammability requirements and uses matte tin lead-free plating. The device supports ≤0.01% duty cycle repetitive surges and exhibits a temperature coefficient of ΔVBR = 0.1% × VBR @ 25 °C × ΔT, ensuring stable clamping across industrial temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 51.0 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 56.7 V / 62.7 V @ 1 mA - Confirmed avalanche onset range under standardized test conditions |
| VC @ IPPM | 82.4 V @ 36.5 A - Clamped voltage during 10/1000 µs surge, limiting downstream stress |
| PPPM | 3000 W - Peak surge energy handling capacity on standard lightning waveform |
| IR @ VRWM | ≤2.0 µA - Low leakage preserves signal integrity and minimizes standby power loss |
| TJ max | +150 °C - Enables use in under-hood automotive, industrial motor drives, and outdoor power supplies |
| Response time | <1.0 ps - Sub-picosecond turn-on ensures protection before sensitive ICs experience overvoltage |
Pinout & Package
DO-214AB (SMC J-Bend) surface-mount package with molded plastic case and solderable terminals per MIL-STD-750 Method 2026. Cathode identification via color band applies only to unidirectional variants; SMDJ51CA is bi-directional and has no polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional avalanche junction terminals | Either terminal accepts positive or negative transients - no orientation required during placement |
| Case | Non-electrical mechanical structure | Plastic body provides strain relief, flame retardancy (UL 94V-0), and JEDEC-compliant thermal path |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under repeated surge stress |
| Built-in strain relief | Reduces mechanical stress on solder joints during thermal cycling or board flexure |
| MSL Level 1 compliance | Supports reflow up to 260 °C peak without preconditioning - eliminates moisture sensitivity handling |
| Low-profile SMC package | Enables compact PCB layout while maintaining 3000 W surge rating - superior power density vs. SMA/SMB |
| RoHS & Halogen-free | Fulfills global environmental compliance (AOS Green Product) without compromising clamping performance |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of 48 V DC bus against load dump and inductive switching transients in servo drive inverters. IC Role / Device Role / Timing Role: Primary surge clamp placed across DC link capacitors to limit voltage overshoot during IGBT turn-off. Use Value: Withstands 3000 W pulses and clamps at 82.4 V, preventing overvoltage failure of 100 V-rated gate drivers and MCU power rails. | Use Scenario: Safeguarding LIN bus transceivers and microcontroller I/O pins from ESD and battery reversal events. IC Role / Device Role / Timing Role: Bidirectional TVS placed between LIN line and ground to suppress ±30 kV contact ESD per ISO 10605. Use Value: Symmetrical clamping ensures equal protection for both positive and negative transients without polarity concerns during layout. |
| Telecom Power Feeds | Renewable Energy Inverters |
Use Scenario: Input-stage surge protection on PoE-powered remote radios exposed to lightning-induced surges on Ethernet cables. IC Role / Device Role / Timing Role: Front-end TVS on 57 V phantom power rail to absorb induced common-mode surges before DC-DC converters. Use Value: 51 V VRWM aligns with IEEE 802.3bt Class 5 PoE voltage range; 82.4 V VC prevents latch-up in downstream PMICs. | Use Scenario: DC-side protection in solar string combiner boxes subjected to lightning surges on PV array wiring. IC Role / Device Role / Timing Role: Parallel-mounted TVS on MPPT input to clamp transients exceeding 1000 V open-circuit voltage. Use Value: 3000 W rating handles high-energy surges typical in outdoor installations; DO-214AB package withstands thermal cycling in desert environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC51CA (Littelfuse) | Same VRWM (51 V), identical DO-214AB package, but lower PPPM (1500 W) and higher VC (85 V) | Limited to lower-energy surge environments; not suitable for 3000 W IEC 61000-4-5 Level 4 testing | Select SMDJ51CA where full 3000 W surge immunity is required; SAC51CA may reduce BOM cost if system-level testing permits derating. |
| SMCJ51CA (ON Semiconductor) | Identical electrical specs (VRWM, VBR, VC, PPPM), same DO-214AB package, but different thermal resistance (RθJA = 80 °C/W vs. 75 °C/W) | Marginally reduced thermal margin in high-ambient designs; otherwise functionally interchangeable in most layouts | SMCJ51CA is viable for drop-in replacement where thermal headroom exceeds 5 °C/W; verify junction temperature rise in constricted airflow environments. |
Compared with SAC51CA and SMCJ51CA, the SMDJ51CA delivers superior thermal performance (RθJA = 75 °C/W) and full 3000 W surge rating - making it preferred for high-reliability industrial and automotive applications where sustained surge robustness and thermal stability are design-critical.
Availability
SMDJ51CA is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom power feeds, and renewable energy inverters requiring stable component supply and certified surge immunity.
Supply support for SMDJ51CA 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 computing, consumer, industrial, and automotive markets.
The SMDJ series is engineered specifically for high-power transient suppression in harsh environments, emphasizing rugged packaging, precise VBR tolerance, and repeatable clamping performance under repetitive surge stress.
FAQ
What is the clamping voltage of the SMDJ51CA under a 10/1000 µs surge?
The SMDJ51CA has a maximum clamping voltage (VC) of 82.4 V when subjected to its rated peak pulse current of 36.5 A on a 10/1000 µs waveform. This value is measured per industry-standard test conditions and defines the upper voltage limit imposed on protected circuitry during surge events - a critical parameter for ensuring downstream components remain within safe operating limits. The SMDJ51CA maintains this clamping performance consistently across its operational temperature range.
Is the SMDJ51CA unidirectional or bidirectional?
The SMDJ51CA is a bi-directional transient voltage suppressor, indicated by the "CA" suffix per AOS documentation. Unlike unidirectional variants (e.g., SMDJ51A), it provides symmetrical clamping for both positive and negative voltage transients without requiring specific orientation during PCB placement. This makes the SMDJ51CA ideal for AC-coupled lines, differential buses, or any application where polarity of surge events cannot be guaranteed.
What is the maximum junction temperature rating for the SMDJ51CA?
The SMDJ51CA has a maximum junction temperature (TJ) rating of +150 °C, as specified in its Absolute Maximum Ratings table. This allows reliable operation in demanding environments such as under-hood automotive electronics, industrial motor controllers, and outdoor power conversion systems. Derating curves confirm usable power dissipation down to ambient temperatures of –55 °C, supporting wide industrial temperature range deployment of the SMDJ51CA.
Does the SMDJ51CA meet RoHS and halogen-free requirements?
Yes, the SMDJ51CA is an AOS Green Product, fully compliant with RoHS directives and halogen-free standards. It uses matte tin lead-free plating and contains no brominated flame retardants or chlorine-based compounds, meeting UL 94V-0 flammability requirements. This compliance is documented in AOS' Green Policy and verified in the official datasheet revision 1.2 - confirming suitability for environmentally regulated markets and sustainable electronics manufacturing using the SMDJ51CA.
What is the leakage current specification for the SMDJ51CA at its rated VRWM?
The SMDJ51CA exhibits a maximum reverse leakage current (IR) of 2.0 µA when biased at its rated reverse stand-off voltage (VRWM) of 51.0 V and tested at 25 °C. This low leakage ensures minimal impact on power efficiency and signal integrity in always-on circuits, such as battery-backed sensors or LIN bus nodes. The specification remains valid across the full –55 °C to +150 °C operating temperature range, with predictable increase governed by the device's thermal coefficient - a key design consideration for the SMDJ51CA in precision analog or low-power systems.
SMDJ51CA 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):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 36.5A
- 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
SMDJ51CA FAQ
1.How can I place an order for SMDJ51CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ51CA 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 SMDJ51CA reliable?
The price and inventory of SMDJ51CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ51CA is usually 5 days.
3.What payment methods are accepted for SMDJ51CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ51CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ51CA?
SMDJ51CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ51CA 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 SMDJ51CA?
For technical support, including SMDJ51CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ51CA requirements.
6.How does Aetrix verify that SMDJ51CA is sourced from the original manufacturer or authorized distributors?
All SMDJ51CA 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 SMDJ51CA meets industry standards.
7.What is the process for return or replacement of SMDJ51CA?
All SMDJ51CA units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ51CA, 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 SMDJ51CA part is unused and in its original packaging.
Return procedure for SMDJ51CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ51CA Tags
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