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Alpha & Omega Semiconductor Inc. SMDJ30CA
- Part No.:
- SMDJ30CA
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ30CA.pdf
- Description:
- 1CH 30V BIDIRECTIONAL 3000W SMD
- Quantity:
- Payment:
- Shipping:
Inventory:2,326
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Product details
Overview
SMDJ30CA from Alpha & Omega Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, rated for 30 V reverse stand-off voltage (VRWM), 33.3–36.8 V breakdown voltage (VBR), and 3000 W peak pulse power (PPPM) on 10/1000 µs waveform - used to protect DC power rails and I/O interfaces against ESD, lightning surges, and inductive switching transients.
For engineers reviewing the SMDJ30CA datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage (48.4 V @ IPPM), low leakage (≤2 µA @ VRWM), fast response (<1.0 ps), and bidirectional surge capability in compact surface-mount form.
Technical Context
The SMDJ30CA employs a glass-passivated silicon junction optimized for high-energy transient suppression. Its bi-directional configuration enables symmetrical clamping in AC-coupled or floating signal paths without polarity constraints.
It delivers 62.0 A peak pulse current (IPPM) at 48.4 V clamping voltage under standardized 10/1000 µs waveform, with thermal resistance of 15 °C/W junction-to-lead when mounted on 8.0 mm × 8.0 mm copper pads - supporting robust surge handling in industrial motor drives and telecom line cards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 30.0 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 33.3 V / 36.8 V @ 1 mA - verified breakdown threshold ensuring predictable turn-on margin |
| Vc @ IPPM | 48.4 V - clamping voltage limiting downstream circuit stress during 62.0 A surge |
| PPPM | 3000 W - peak transient energy absorption capacity on standard 10/1000 µs waveform |
| IR @ VRWM | ≤2.0 µA - minimal leakage preserving efficiency in low-power standby circuits |
| TJ max | +150 °C - extended junction temperature rating enabling operation in harsh environments |
| Package | DO-214AB (SMC J-bend) - industry-standard surface-mount outline with strain relief and MSL1 moisture sensitivity |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with J-bend leads; cathode identified by color band (not applicable for bi-directional SMDJ30CA - no polarity marking required).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode | Bi-directional terminal pair | Interchangeable terminals - symmetric conduction in both directions for AC or floating rail protection |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enhanced reliability and stable VBR over temperature and lifetime vs. epoxy-passivated alternatives |
| Low-profile DO-214AB | Enables high-density PCB layouts while maintaining 3000 W surge rating - no height compromise |
| Fast response time | <1.0 ps rise time ensures clamping activation before transient energy damages downstream ICs |
| MSL1 rating | Compatible with standard lead-free reflow profiles up to 260 °C peak - no pre-bake required |
| UL 94V-0 flammability | Self-extinguishing plastic housing meets safety standards for enclosed industrial equipment |
Applications
| Industrial Motor Drives | Telecom Line Interfaces |
|---|---|
Use Scenario: Protection of gate drivers and feedback sensing lines against inductive kickback from IGBTs and MOSFETs. IC Role / Device Role / Timing Role: Bi-directional TVS clamp placed across isolated DC bus or signal transformer secondary. Use Value: Limits transient overshoot to ≤48.4 V, preventing latch-up or oxide rupture in 3.3 V/5 V control ICs. | Use Scenario: Surge protection on T1/E1, xDSL, or PoE data lines exposed to lightning-induced common-mode transients. IC Role / Device Role / Timing Role: Bidirectional shunt device bridging differential pair or line-to-ground in front-end interface stage. Use Value: Absorbs 3000 W pulses without degradation, maintaining signal integrity through 10/1000 µs threat profile. |
| Automotive Body Control Modules | Renewable Energy Inverters |
Use Scenario: Guarding LIN bus transceivers and sensor inputs against load dump and ISO 7637-2 Pulse 5a/b. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V supply rail and bidirectional signal lines. Use Value: Withstands 150 °C ambient and maintains ≤2 µA leakage - critical for low-current sleep modes. | Use Scenario: DC-link overvoltage suppression in solar microinverters and battery storage converters. IC Role / Device Role / Timing Role: Parallel-connected TVS across DC bus capacitors to clamp switching transients and grid fault spikes. Use Value: 3000 W rating handles repetitive 10/1000 µs surges per IEC 61000-4-5 Level 4 without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC30CA (Littelfuse) | Same VRWM (30 V), but lower PPPM (1500 W); Vc = 49.0 V @ IPPM = 30.6 A | Lower surge capacity limits use to sub-IEC 61000-4-5 Level 3 environments | Select when cost sensitivity outweighs need for full 3000 W immunity |
| 1.5KE30CA (ON Semiconductor) | Through-hole DO-201 package; identical electrical specs but larger footprint and no MSL1 rating | Not suitable for automated SMT assembly; requires wave solder or hand-solder rework | Choose only for legacy through-hole designs or prototyping where board space is unconstrained |
Compared with SAC30CA and 1.5KE30CA, the SMDJ30CA provides double the surge power rating in a moisture-insensitive, RoHS-compliant surface-mount package - making it optimal for high-reliability, high-volume industrial and automotive production.
Availability
SMDJ30CA is available at Aetrix Electronics and suitable for industrial motor drives, telecom line interfaces, automotive body control modules, and renewable energy inverters requiring stable component supply and long-term lifecycle support.
Supply support for SMDJ30CA 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 designed specifically for high-power transient suppression in surface-mount applications - balancing ultra-low clamping, high surge tolerance, and manufacturability in automated assembly lines.
FAQ
What is the clamping voltage of the SMDJ30CA under maximum surge conditions?
The SMDJ30CA exhibits a maximum clamping voltage (Vc) of 48.4 V when subjected to its rated peak pulse current of 62.0 A on a 10/1000 µs waveform. This value is measured per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream 3.3 V or 5 V ICs remain within absolute maximum ratings.
Is the SMDJ30CA suitable for bidirectional signal line protection?
Yes, the SMDJ30CA is explicitly designed as a bi-directional TVS diode, with identical electrical characteristics in both forward and reverse directions. Its symmetrical breakdown behavior makes it ideal for protecting AC-coupled interfaces such as RS-485, CAN FD, or Ethernet PHY lines where polarity cannot be assumed - unlike unidirectional variants like SMDJ30A.
Does the SMDJ30CA meet lead-free reflow requirements?
Yes, the SMDJ30CA is rated MSL1 per J-STD-020 and qualified for lead-free reflow with a maximum peak temperature of 260 °C. Its matte tin lead finish and DO-214AB package ensure compatibility with standard SMT assembly processes without preconditioning or special handling - supporting high-yield manufacturing.
What is the maximum operating temperature for the SMDJ30CA?
The SMDJ30CA has a specified junction temperature range of –55 °C to +150 °C. Its thermal resistance junction-to-lead (RθJL) is 15 °C/W when mounted on 8.0 mm × 8.0 mm copper pads, enabling reliable operation in under-hood automotive or industrial enclosure environments where ambient temperatures exceed 105 °C.
How does the SMDJ30CA compare to older 1.5KE-series TVS diodes?
The SMDJ30CA replaces through-hole 1.5KE30CA with identical electrical specs but in a smaller, surface-mount DO-214AB package offering superior thermal performance (RθJL = 15 °C/W vs. ~25 °C/W), MSL1 compliance, and RoHS/halogen-free construction - delivering higher power density and automated assembly readiness without sacrificing surge capability.
SMDJ30CA 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):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 62A
- 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
SMDJ30CA FAQ
1.How can I place an order for SMDJ30CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ30CA 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 SMDJ30CA reliable?
The price and inventory of SMDJ30CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ30CA is usually 5 days.
3.What payment methods are accepted for SMDJ30CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ30CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ30CA?
SMDJ30CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ30CA 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 SMDJ30CA?
For technical support, including SMDJ30CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ30CA requirements.
6.How does Aetrix verify that SMDJ30CA is sourced from the original manufacturer or authorized distributors?
All SMDJ30CA 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 SMDJ30CA meets industry standards.
7.What is the process for return or replacement of SMDJ30CA?
All SMDJ30CA units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ30CA, 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 SMDJ30CA part is unused and in its original packaging.
Return procedure for SMDJ30CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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