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Alpha & Omega Semiconductor Inc. SMDJ33CA
- Part No.:
- SMDJ33CA
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ33CA.pdf
- Description:
- 1CH 33V BIDIRECTIONAL 3000W SMD
- Quantity:
- Payment:
- Shipping:
Inventory:6,797
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Product details
Overview
SMDJ33CA 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 33 V reverse stand-off voltage (VRWM), 36.7–40.6 V breakdown voltage (VBR) at 1 mA, 53.3 V maximum clamping voltage (VC) at 56.3 A peak pulse current, and 3000 W peak pulse power rating on 10/1000 µs waveform.
For engineers reviewing the SMDJ33CA datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional clamping capability, low leakage (<2 µA @ 33 V), fast sub-1 ps response time, JEDEC DO-214AB surface-mount compatibility, and thermal resistance (RθJA = 75 °C/W) under standard PCB layout conditions.
Technical Context
The SMDJ33CA operates as a bi-directional avalanche diode, providing symmetrical clamping in both polarities without external polarity constraints. Its glass-passivated junction ensures stable VBR tolerance (±5% typical), while the low-profile DO-214AB package supports automated SMT assembly with MSL1 moisture sensitivity and 260 °C lead-free reflow compliance.
It delivers 3000 W peak pulse power handling on standardized 10/1000 µs transients, with thermal performance validated on 8.0 mm × 8.0 mm copper pads per terminal. The device sustains repetitive surges at 0.01% duty cycle and exhibits <2 µA reverse leakage at VRWM - critical for low-power sensor and communication line protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 33.0 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 36.7 V / 40.6 V @ 1 mA - Confirmed breakdown range defining turn-on threshold tolerance |
| VC @ IPPM | 53.3 V @ 56.3 A - Clamped voltage during 3000 W transient, limiting downstream stress |
| PPPM | 3000 W - Peak pulse power dissipation on 10/1000 µs waveform, enabling IEC 61000-4-5 Level 4 compliance |
| IR @ VRWM | <2.0 µA - Ultra-low leakage preserves signal integrity in high-impedance circuits |
| TJ max | +150 °C - Maximum junction temperature supporting industrial ambient operation |
| RθJA | 75 °C/W - Thermal resistance to ambient on standard FR-4 with 8 mm² copper pads per lead |
Pinout & Package
DO-214AB (SMC J-Bend) surface-mount package with cathode band marking for polarity identification; bidirectional operation eliminates functional polarity dependence. Molded plastic case meets UL 94V-0 flammability rating and RoHS/Halogen-free requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (Bidirectional) | Surge current path | Two-terminal symmetric structure - either terminal serves as anode or cathode depending on transient polarity |
| Cathode Band (Marking) | Reference indicator | Visual polarity marker per JEDEC DO-214AB; irrelevant for bidirectional function but required for orientation during placement |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 3000 W peak pulse power | Supports robust immunity against IEC 61000-4-5 combination wave surges up to 4 kV open-circuit |
| Sub-1 ps response time | Clamps transients before sensitive ICs experience overvoltage - critical for USB, RS-485, and Ethernet PHY protection |
| Glass-passivated junction | Ensures long-term VBR stability and low parameter drift across temperature and lifetime |
| MSL1 / 260 °C reflow | Compatible with standard lead-free SMT processes without pre-baking or special handling |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of 24 V DC power rails feeding microcontrollers and CAN transceivers against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Bidirectional TVS clamp absorbing >3000 W transients while maintaining <53.3 V clamping to prevent latch-up in downstream logic. Use Value: Eliminates need for dual-unidirectional devices; withstands repeated 12 V/24 V system surges per ISO 7637-2 Pulse 5a. | Use Scenario: Surge suppression on LIN bus lines exposed to ESD and coupled noise from adjacent high-current actuators. IC Role / Device Role / Timing Role: Fast-response voltage clamp placed directly at connector entry point to limit transient propagation into LIN transceiver inputs. Use Value: Sub-1 ps response ensures clamping occurs before LIN PHY damage threshold (~60 V) is exceeded. |
| Telecom Power Feeds | Renewable Energy Inverters |
Use Scenario: DC input protection for PoE-powered switches and remote radio units subjected to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary-level TVS on 48 V DC feed, coordinated with upstream GDTs to handle multi-kW energy events. Use Value: 3000 W rating enables coordination with secondary protection stages while maintaining low clamping voltage for silicon reliability. | Use Scenario: DC-link surge protection in solar string inverters where PV array wiring introduces high-voltage transients during ground faults or lightning strikes. IC Role / Device Role / Timing Role: Bidirectional clamp on ungrounded DC bus to suppress common-mode surges without requiring reference to earth or chassis ground. Use Value: Symmetrical clamping allows use on floating DC buses - avoids grounding complications in transformerless inverter topologies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC33CA (Littelfuse) | Same VRWM (33 V), identical DO-214AB package, but lower PPPM (1500 W) and higher VC (58.1 V @ 25.8 A) | Limited to lower-energy transients; unsuitable for IEC 61000-4-5 Level 4 without derating | Select when cost sensitivity outweighs peak surge requirement and board space permits parallel staging |
| 1.5KE33CA (ON Semiconductor) | Higher VRWM (33 V), same bidirectional function, but axial DO-201 package - not surface-mount compatible | Requires through-hole assembly and larger PCB footprint; incompatible with automated SMT lines | Choose only for legacy through-hole designs or prototyping where reflow compatibility is not required |
Compared with SAC33CA and 1.5KE33CA, the SMDJ33CA uniquely combines 3000 W surge rating, DO-214AB SMT compatibility, and bidirectional symmetry - making it the preferred choice for high-reliability, volume-manufactured industrial and automotive electronics requiring automated assembly and robust Level 4 surge immunity.
Availability
SMDJ33CA is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power feeds requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMDJ33CA 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 MOSFETs, TVS diodes, and power ICs for high-efficiency power conversion and protection.
The SMDJ series was developed specifically for high-power, surface-mount transient suppression in harsh environments - targeting automotive, industrial, and renewable energy systems demanding reliability beyond AEC-Q200 or IEC 61000-4-5 compliance.
FAQ
What is the clamping voltage of the SMDJ33CA under a 3000 W transient?
The SMDJ33CA clamps to a maximum of 53.3 V at 56.3 A peak pulse current, corresponding to the standardized 10/1000 µs waveform delivering 3000 W. This value is measured per JEDEC test conditions with 8.0 mm × 8.0 mm copper pads per terminal and defines the upper voltage limit imposed on protected circuitry during surge events. The SMDJ33CA maintains this clamping performance consistently across its specified operating temperature range.
Is the SMDJ33CA suitable for protecting RS-485 communication lines?
Yes, the SMDJ33CA is suitable for RS-485 line protection due to its bidirectional clamping, sub-1 ps response time, and low leakage (<2 µA). Its 33 V VRWM aligns with common ±12 V RS-485 common-mode ranges, and the 53.3 V clamping voltage stays within absolute maximum ratings of most RS-485 transceivers. The DO-214AB package allows compact placement near connectors - a key requirement for effective ESD and surge suppression in SMD-based RS-485 nodes.
Does the SMDJ33CA require heatsinking in typical applications?
No, the SMDJ33CA does not require external heatsinking for transient suppression duty cycles. Its RθJA of 75 °C/W and 150 °C maximum junction temperature are rated for single-pulse or low-duty-cycle (0.01%) surges on standard FR-4 with 8 mm² copper pads. Continuous power dissipation is not applicable - the device is designed for short-duration energy absorption, not steady-state thermal management. The SMDJ33CA relies on PCB copper area for transient thermal mass, not heatsinks.
How does the SMDJ33CA differ from unidirectional SMDJ33A?
The SMDJ33CA is bi-directional, while the SMDJ33A is unidirectional. Both share identical VRWM (33 V), VBR (36.7–40.6 V), and PPPM (3000 W), but the SMDJ33CA clamps symmetrically in both polarities - essential for AC-coupled, floating, or differential signal lines. The SMDJ33A requires correct polarity orientation and cannot protect against negative-going transients on positive rails. The SMDJ33CA eliminates orientation dependency and simplifies layout in bidirectional applications.
What is the moisture sensitivity level (MSL) rating for the SMDJ33CA?
The SMDJ33CA is rated MSL1 per J-STD-020, meaning it has unlimited floor life and can withstand peak reflow temperatures up to 260 °C without baking. This rating is confirmed by Alpha & Omega's qualification testing and applies to the standard tape-and-reel packaging. The MSL1 classification ensures compatibility with standard lead-free SMT assembly lines without special handling, dry pack, or baking requirements - a key advantage for high-volume manufacturing of the SMDJ33CA.
SMDJ33CA 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):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 56.3A
- 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
SMDJ33CA FAQ
1.How can I place an order for SMDJ33CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ33CA 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 SMDJ33CA reliable?
The price and inventory of SMDJ33CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ33CA is usually 5 days.
3.What payment methods are accepted for SMDJ33CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ33CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ33CA?
SMDJ33CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ33CA 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 SMDJ33CA?
For technical support, including SMDJ33CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ33CA requirements.
6.How does Aetrix verify that SMDJ33CA is sourced from the original manufacturer or authorized distributors?
All SMDJ33CA 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 SMDJ33CA meets industry standards.
7.What is the process for return or replacement of SMDJ33CA?
All SMDJ33CA units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ33CA, 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 SMDJ33CA part is unused and in its original packaging.
Return procedure for SMDJ33CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ33CA Tags
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