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Taiwan Semiconductor Corporation SMDJ33CA
- Part No.:
- SMDJ33CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ33CA.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,055
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Product details
Overview
SMDJ33CA from Taiwan Semiconductor is a bidirectional 33V transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, rated for 3000W peak pulse power, 53.3V clamping voltage at 56.3A peak current, and -55°C to +175°C operating junction temperature. It protects telecom and industrial interfaces against ESD, lightning-induced surges, and load-switch transients.
For engineers reviewing the SMDJ33CA datasheet, SMDJ33CA pinout, SMDJ33CA application, or SMDJ33CA equivalent, key selection criteria include bidirectional clamping capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, 1µA max reverse leakage at 33V, and DO-214AB thermal performance (RθJA = 75°C/W).
Technical Context
The SMDJ33CA employs a glass-passivated silicon junction optimized for fast transient suppression with symmetrical breakdown behavior in both polarities. Its bidirectional configuration enables single-device protection of AC-coupled or floating signal lines without polarity concerns.
Designed for surface-mount automated placement, it meets J-STD-020 moisture sensitivity level 1 and JESD 201 class 2 whisker resistance. The device sustains 300A non-repetitive forward surge (8.3ms half-sine) and operates reliably across -55°C to +175°C junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse working voltage before clamping begins |
| VBR min/max | 36.7 V / 40.6 V - Verified breakdown threshold at 1 mA test current, ensuring predictable turn-on |
| VC@IPPM | 53.3 V - Clamping voltage at 56.3 A peak pulse current, limiting downstream voltage stress |
| PPK | 3000 W - Peak pulse power handling per 10/1000 µs waveform, enabling robust surge immunity |
| IPPM | 56.3 A - Maximum non-repetitive peak pulse current the device safely clamps |
| TJ max | +175 °C - Maximum junction temperature, supporting high-ambient industrial deployments |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance, defining PCB copper requirements for thermal management |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, bidirectional, cathode band not applicable (symmetrical terminals).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (bidirectional) | Surge current path | Both terminals function identically; no polarity marking required for AC or floating-line protection |
| Case (cathode band absent) | Thermal conduction path | DO-214AB body provides mechanical anchoring and contributes to heat dissipation via PCB copper |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses, or ungrounded circuits without polarity constraints |
| ISO 7637-2 compliance | Validated for automotive-level transient immunity (Pulse 1/2a/2b/3a/3b), suitable for vehicle ECUs and telematics |
| <1 ps response time | Clamps transients before sensitive ICs experience overvoltage, preserving signal integrity in high-speed interfaces |
| Level 1 moisture sensitivity | Eliminates pre-bake requirement during SMT assembly, reducing manufacturing cost and cycle time |
| UL 94V-0 molding compound | Ensures flame retardancy in enclosed industrial enclosures and telecom cabinets under fault conditions |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting 24V analog input channels in programmable logic controllers from field-wiring induced surges and ESD. IC Role / Device Role / Timing Role: Bidirectional TVS placed at connector entry point to clamp ±1kV EFT and ±25kV contact ESD per IEC 61000-4-2/4-4. Use Value: Limits voltage seen by ADC front-end to ≤53.3V, preventing latch-up or damage while maintaining signal fidelity up to 10 kHz bandwidth. | Use Scenario: Safeguarding LIN bus transceivers and sensor inputs in body control units exposed to battery dump and load-dump pulses. IC Role / Device Role / Timing Role: Primary surge suppressor on LIN data line and 12V supply rail per ISO 7637-2 Pulse 2b and Pulse 5a. Use Value: Withstands 3000W pulses without degradation, ensuring uninterrupted communication during engine cranking and alternator regulation events. |
| Telecom DSL Line Interface | Renewable Energy Inverter Monitoring |
Use Scenario: Shielding ADSL/VDSL line drivers and receivers from lightning-induced common-mode surges on twisted-pair copper lines. IC Role / Device Role / Timing Role: Paired bidirectional TVS on tip/ring lines, coordinated with gas discharge tube (GDT) primary protection. Use Value: Fast <1ps response captures surge energy before GDT fires, reducing let-through voltage to <53.3V and protecting downstream PHY ICs. | Use Scenario: Protecting voltage/current sensing circuits in solar inverter DC-link monitoring subsystems from switching transients and grid faults. IC Role / Device Role / Timing Role: Secondary clamping device across isolated amplifier inputs referenced to high-side DC bus (up to 1000V). Use Value: 33V working voltage isolates measurement circuitry from DC-link noise while clamping fast dv/dt spikes to safe levels for precision op-amps. |
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 33V VWM, 53.3V VC, but rated for 2500W PPK and higher RθJA (85°C/W) | Limited to lower-energy surge environments; less margin for repeated ISO 7637-2 Pulse 5a events | Select when cost sensitivity outweighs need for full 3000W headroom and thermal margin |
| SMCJ33CA (ON Semiconductor) | Identical VWM, VBR, VC, and PPK; same DO-214AB package but slightly higher IR (5 µA vs. 1 µA at VWM) | Acceptable for most industrial designs; may require tighter layout filtering where ultra-low leakage is critical | Drop-in alternative where supply chain diversification is prioritized and 1 µA leakage is not mandatory |
Compared with SAC33CA and SMCJ33CA, the SMDJ33CA delivers superior 3000W surge capacity and lower leakage, making it preferred for high-reliability automotive and industrial applications demanding margin against worst-case transients and long-term stability.
Availability
SMDJ33CA is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, telecom DSL line interfaces, and renewable energy inverter monitoring requiring stable component supply and consistent surge immunity performance.
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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for industrial and automotive markets.
The SMDJ series was engineered specifically for high-power, surface-mount transient suppression in harsh environments-emphasizing ISO 7637-2 compliance, thermal robustness, and automated assembly compatibility.
FAQ
What is the maximum clamping voltage of the SMDJ33CA under standard test conditions?
The SMDJ33CA has a maximum clamping voltage (VC) of 53.3 V when subjected to its rated peak pulse current (IPPM) of 56.3 A using the 10/1000 µs waveform defined in IEC 61000-4-5. This value is measured at TA = 25°C and ensures downstream circuitry remains within safe voltage limits during transient events. The SMDJ33CA maintains this clamping performance across its full operating temperature range.
Does the SMDJ33CA require polarity-aware PCB layout?
No-the SMDJ33CA is a bidirectional TVS diode, meaning its anode and cathode terminals are functionally identical and symmetric. There is no cathode band marking on the DO-214AB package, and it clamps equally in both directions. This eliminates orientation constraints during PCB layout and SMT placement, simplifying design for AC-coupled or floating signal paths where polarity is undefined.
How does the SMDJ33CA meet automotive transient immunity standards?
The SMDJ33CA is explicitly validated to meet ISO 7637-2 for Pulses 1, 2a, 2b, 3a, and 3b-covering key automotive transients including load dump, jump start, and inductive switching. Its 3000W peak power rating, fast <1 ps response, and robust thermal design (RθJA = 75°C/W) ensure reliable operation in body control modules, infotainment systems, and telematics units without derating in typical under-hood ambient conditions.
What is the reverse leakage current specification for the SMDJ33CA at its working voltage?
At its maximum working stand-off voltage (VWM) of 33 V and TA = 25°C, the SMDJ33CA exhibits a maximum reverse leakage current (IR) of 1 µA. This low leakage minimizes power loss in always-on monitoring circuits and prevents false triggering in high-impedance sensor interfaces, distinguishing it from alternatives like SMCJ33CA which specify up to 5 µA under identical conditions.
Can the SMDJ33CA be used in parallel for higher surge current handling?
Parallel use of SMDJ33CA devices is not recommended due to mismatch in dynamic impedance and breakdown voltage tolerance (±5% VBR), which causes uneven current sharing and potential thermal runaway. For higher current requirements, select a single higher-rated device such as SMDJ36CA or SMDJ40CA-or consult Taiwan Semiconductor's application guidance on staged protection topologies using coordinated TVS/GDT combinations.
SMDJ33CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMDJ
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
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.
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