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Alpha & Omega Semiconductor Inc. SMDJ28CA
- Part No.:
- SMDJ28CA
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ28CA.pdf
- Description:
- 1CH 28V BIDIRECTIONAL 3000W SMD
- Quantity:
- Payment:
- Shipping:
Inventory:8,062
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Product details
Overview
SMDJ28CA from Alpha & Omega Semiconductor is a bi-directional transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 28 V reverse stand-off voltage (VRWM), 31.1–34.4 V breakdown voltage (VBR) at 1 mA, 45.4 V maximum clamping voltage at 66.1 A peak pulse current, and 3000 W peak pulse power dissipation on 10/1000 µs waveform - deployed in industrial motor drives to safeguard IGBT gate drivers against ESD and load dump transients.
For engineers reviewing the SMDJ28CA datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional clamping capability, DO-214AB package compatibility with high-density PCB layouts, thermal resistance (RθJA = 75 °C/W), and compliance with JEDEC MSL Level 1 reflow requirements.
Technical Context
The SMDJ28CA operates as a silicon avalanche diode with glass-passivated junction and low-profile DO-214AB (SMC J-bend) packaging. Its bidirectional architecture enables symmetrical clamping in both polarities without external polarity management, supporting surge immunity per IEC 61000-4-2 (ESD) and IEC 61000-4-5 (surge).
It delivers sub-1 ps response time from 0 V to breakdown, 0.01% duty cycle repetition rating, and stable temperature coefficient (ΔVBR = 0.1% × VBR @ 25 °C × ΔT), ensuring predictable clamping across –55 °C to +150 °C operating junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 28.0 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR @ IT=1 mA | 31.1–34.4 V - Validated breakdown threshold defining turn-on precision for transient suppression |
| Vc @ IPPM | 45.4 V - Clamped voltage at 66.1 A peak pulse ensures downstream ICs remain below absolute max ratings |
| PPPM (10/1000 µs) | 3000 W - Peak surge energy handling capacity for automotive load dump and industrial switching events |
| TJ Range | –55 °C to +150 °C - Enables deployment in under-hood automotive ECUs and industrial inverters |
| RθJA | 75 °C/W - Thermal performance baseline for layout design using 8 mm × 8 mm copper pads per terminal |
| IR @ VRWM | 2.0 µA - Low leakage preserves battery-backed circuit integrity in always-on systems |
Pinout & Package
DO-214AB (SMC J-bend) surface-mount package with molded plastic case, matte tin lead-free plating, and JEDEC-compliant mechanical dimensions. Cathode identification via color band applies only to unidirectional variants; SMDJ28CA is bi-directional and has no polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode | Bi-directional terminals | Identical electrical behavior in either orientation - no polarity-dependent routing required |
| Case | Non-conductive molded body | No thermal or electrical connection to PCB substrate; heat transfer occurs solely through leads |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of AC-coupled or floating signal paths without polarity constraints |
| Glass-passivated junction | Ensures long-term reliability and stable VBR under humidity and thermal cycling stress |
| MSL Level 1 rating | Supports standard Pb-free reflow profiles up to 260 °C peak without popcorn or delamination |
| UL 94V-0 flammability | Meets safety standards for enclosed industrial and transportation equipment enclosures |
| Built-in strain relief | Reduces mechanical stress on solder joints during board flexure or thermal expansion mismatch |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of gate driver ICs and isolated feedback circuits against inductive kickback and bus transients in 24 V DC-fed inverters. IC Role / Device Role / Timing Role: TVS clamping element placed directly at power stage input to limit voltage excursions to <46 V during 3 kA-equivalent surges. Use Value: Prevents latch-up or permanent damage to SiC MOSFET drivers by holding rail voltage within safe operating area during 10/1000 µs transients. | Use Scenario: Safeguarding LIN bus transceivers and microcontroller I/O pins against battery reverse connection and jump-start spikes. IC Role / Device Role / Timing Role: Bidirectional shunt device absorbing ±100 V/500 ms surges while maintaining <2 µA leakage at 28 V system nominal. Use Value: Eliminates need for dual unidirectional TVS devices, reducing BOM count and PCB footprint in space-constrained modules. |
| Telecom Power Feeds | Renewable Energy Inverters |
Use Scenario: Overvoltage protection on 48 V DC telecom rectifier outputs exposed to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary surge clamp on secondary-side distribution rail, coordinated with upstream MOVs for staged energy absorption. Use Value: Limits clamping voltage to 45.4 V, enabling use of 50 V-rated bulk capacitors and reducing derating overhead. | Use Scenario: DC-link protection in solar string inverters where PV array transients couple into MPPT controller supply rails. IC Role / Device Role / Timing Role: Fast-response (sub-1 ps) TVS placed at DC-link filter output to suppress nanosecond-scale ringing from fast-switching SiC modules. Use Value: Maintains clamping stability across –40 °C to +85 °C ambient with <0.1%/°C VBR drift, ensuring consistent protection in outdoor deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC28 | Same VRWM (28 V) and PPPM (3000 W), but TO-220AC package - larger footprint and higher RθJA (50 °C/W) | Requires heatsinking for sustained surge duty; unsuitable for ultra-thin or high-density boards | Select when higher thermal mass is needed and board space allows discrete mounting |
| P6SMB28CA | Lower PPPM (600 W), same DO-214AA package - smaller die, reduced surge margin | Limited to lower-energy transients (e.g., ESD-only); not rated for load dump per ISO 7637-2 | Choose only for cost-sensitive consumer applications with verified low-surge environments |
Compared with SAC28 and P6SMB28CA, the SMDJ28CA offers optimal balance of high-energy surge handling (3000 W), compact DO-214AB footprint, and bidirectional symmetry - making it preferred for automotive and industrial designs requiring IPC-classified surge immunity without thermal derating penalties.
Availability
SMDJ28CA is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power feeds requiring stable component supply with full traceability and lifecycle continuity.
Supply support for SMDJ28CA 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 ruggedness, repeatable clamping, and JEDEC-compliant manufacturability for Tier 1 automotive and industrial suppliers.
FAQ
What is the clamping voltage of the SMDJ28CA at its rated peak pulse current?
The SMDJ28CA exhibits a maximum clamping voltage (VC) of 45.4 V at its rated peak pulse current (IPPM) of 66.1 A under the standardized 10/1000 µs waveform. This value is measured per test conditions specified in the datasheet and defines the upper voltage limit imposed on protected circuits during worst-case surge events - critical for verifying compatibility with downstream 48 V-rated components in the SMDJ28CA application chain.
Is the SMDJ28CA suitable for bidirectional signal line protection?
Yes, the SMDJ28CA is explicitly designed as a bi-directional TVS diode, with identical electrical characteristics in both forward and reverse directions. Its CA suffix denotes bidirectional functionality, and all published parameters - including VBR, VC, and IPPM - apply symmetrically. This makes the SMDJ28CA ideal for protecting AC-coupled interfaces like RS-485, CAN FD, or audio lines where polarity reversal or floating references occur - unlike unidirectional variants such as SMDJ28A.
What is the thermal resistance of the SMDJ28CA, and how does it affect PCB layout?
The SMDJ28CA has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. This value assumes standard JEDEC test conditions and directly informs minimum copper area requirements: reducing pad size increases thermal impedance, risking junction overheating during repetitive surges. For reliable operation in high-duty-cycle applications, maintain at least 8 mm × 8 mm thermal pads and avoid narrow traces - a key constraint in the SMDJ28CA layout guidelines.
Does the SMDJ28CA meet RoHS and halogen-free compliance standards?
Yes, the SMDJ28CA is an AOS Green Product - fully compliant with RoHS Directive 2011/65/EU and halogen-free per IEC 61249-2-21. It contains no lead, brominated flame retardants, or chlorine-based compounds, and uses matte tin lead-free plating. This compliance is documented in AOS' official Green Policy (aospdf.com/media/AOSGreenPolicy.pdf) and verified through material declarations - essential for SMDJ28CA deployment in EU and Asia-Pacific markets with strict environmental regulations.
How does the SMDJ28CA's response time compare to other TVS diodes in its class?
The SMDJ28CA achieves a typical response time of less than 1.0 ps from 0 V to breakdown voltage - among the fastest in the DO-214AB TVS category. This sub-picosecond reaction enables effective suppression of nanosecond-scale transients (e.g., ESD events per IEC 61000-4-2) before sensitive circuitry experiences overvoltage stress. Unlike slower MOVs or polymer-based protectors, the SMDJ28CA's silicon avalanche structure ensures deterministic timing - a decisive factor in high-speed data line and gate driver protection where the SMDJ28CA is routinely specified.
SMDJ28CA 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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 66.1A
- 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
SMDJ28CA FAQ
1.How can I place an order for SMDJ28CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ28CA 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 SMDJ28CA reliable?
The price and inventory of SMDJ28CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ28CA is usually 5 days.
3.What payment methods are accepted for SMDJ28CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ28CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ28CA?
SMDJ28CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ28CA 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 SMDJ28CA?
For technical support, including SMDJ28CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ28CA requirements.
6.How does Aetrix verify that SMDJ28CA is sourced from the original manufacturer or authorized distributors?
All SMDJ28CA 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 SMDJ28CA meets industry standards.
7.What is the process for return or replacement of SMDJ28CA?
All SMDJ28CA units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ28CA, 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 SMDJ28CA part is unused and in its original packaging.
Return procedure for SMDJ28CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ28CA Tags
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