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Taiwan Semiconductor Corporation SMDJ33CAH
- Part No.:
- SMDJ33CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ33CAH.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,401
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Product details
Overview
SMDJ33CAH from Taiwan Semiconductor is a bidirectional 33V transient voltage suppressor diode (TVS) 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 automotive and industrial electronics against ESD, load dump, and lightning-induced transients.
For engineers reviewing the SMDJ33CAH datasheet, SMDJ33CAH pinout, SMDJ33CAH application, or SMDJ33CAH equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, fast sub-1ps response time, and DO-214AB mechanical compatibility with automated SMT placement.
Technical Context
The SMDJ33CAH implements a glass-passivated silicon avalanche junction optimized for high-energy transient suppression in bidirectional signal and power lines. Its breakdown voltage range of 36.7V–40.6V at 1mA test current ensures robust margin above the 33V working stand-off voltage while maintaining low clamping ratio (VC/VBR ≈ 1.33).
Thermally, it features RθJA = 75°C/W and RθJL = 15°C/W, enabling reliable operation under sustained surge conditions when mounted on adequate copper area. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR @ IT=1mA | 36.7–40.6 V - Verified avalanche breakdown threshold ensuring predictable turn-on during transients |
| VC @ IPPM=56.3A | 53.3 V - Clamped voltage seen by protected circuit during full 3000W surge event |
| PPK | 3000 W - Peak pulse power handling per 10/1000µs waveform per Fig.5 |
| TJ Range | -55°C to +175°C - Full automotive-grade junction temperature operating envelope |
| Response Time | <1.0 ps - Sub-picosecond junction response enables protection of high-speed interfaces |
| Package | DO-214AB (SMC) - Industry-standard surface-mount outline with 7.11×6.22 mm footprint and 2.39 mm height |
Pinout & Package
DO-214AB (SMC) package with center cathode band marking for polarity identification; bidirectional configuration means both terminals are functionally symmetric-no anode/cathode distinction in circuit use.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional transient path | Either terminal serves as input/output for clamping in both polarities; no DC bias dependency |
| Case / Body | Thermal and mechanical interface | Exposed metal slug provides primary thermal conduction path to PCB copper; requires soldered thermal pad |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood and chassis applications per stress test requirements |
| ISO 7637-2 compliant | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
| Glass passivated junction | Enhanced long-term reliability and stable VBR drift over temperature and life cycles |
| Level 1 moisture sensitivity | Zero bake requirement prior to reflow; compatible with standard J-STD-020 assembly flow |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing |
Applications
| Automotive Power Line Protection | Industrial CAN Bus Interface |
|---|---|
Use Scenario: 12V battery line in engine control units exposed to load dump and jump-start surges. IC Role / Device Role / Timing Role: Bidirectional TVS placed across power rail to clamp transients before they reach downstream regulators and microcontrollers. Use Value: Limits voltage to ≤53.3V during 3000W pulses, preventing damage to 3.3V/5V logic and analog sensors powered from same rail. | Use Scenario: CAN_H/CAN_L differential pair in factory automation gateways subjected to ESD and cable discharge events. IC Role / Device Role / Timing Role: Common-mode TVS pair protecting both bus lines simultaneously without distorting signal integrity. Use Value: Sub-1ps response preserves CAN FD bit timing; 53.3V clamping prevents receiver saturation during ±8kV contact ESD per IEC 61000-4-2. |
| Telecom AC/DC Front-End | Renewable Energy Inverter Control |
Use Scenario: Secondary-side DC output of telecom SMPS exposed to induced surges from nearby lightning strikes. IC Role / Device Role / Timing Role: Final-stage overvoltage clamp before point-of-load converters and FPGA I/O banks. Use Value: 3000W rating absorbs multi-pulse energy without degradation; DO-214AB thermal mass sustains repeated surges in fanless enclosures. | Use Scenario: Isolated gate driver supply rails in solar string inverters subject to grid-switching transients. IC Role / Device Role / Timing Role: Bidirectional clamp on isolated 15V auxiliary supply feeding IGBT drivers and sensing ICs. Use Value: 175°C max junction temperature supports operation near heat-generating power modules; AEC-Q101 qualification adds confidence for field-reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ33CA | Same DO-214AC (SMA) package; lower PPK = 400W; VC = 53.3V @ 7.5A | Not suitable for 3000W load dump; limited to low-energy ESD and signal-line protection | Select only when surge energy is <500W and board space constraints favor smaller SMA footprint |
| Vishay SMBJ33CA | DO-214AA (SMB) package; PPK = 600W; VC = 53.3V @ 11.3A; same VBR range | Insufficient for ISO 7637-2 Pulse 1; appropriate for consumer-grade USB or Ethernet port protection | Choose when cost sensitivity outweighs automotive compliance and higher-power surge immunity |
Compared with SMAJ33CA and SMBJ33CA, the SMDJ33CAH delivers 5× and 4.5× higher peak power handling respectively, enabling direct compliance with automotive load-dump standards without parallel devices or derating-critical for single-point protection in safety-critical ECUs.
Availability
SMDJ33CAH is available at Aetrix Electronics and suitable for automotive power distribution, industrial communication interfaces, telecom front-end protection, and renewable energy control systems requiring stable component supply across extended production lifecycles.
Supply support for SMDJ33CAH 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 with global automotive and industrial certifications.
The SMDJ series was designed specifically for high-reliability transient suppression in harsh environments-targeting AEC-Q101-compliant automotive subsystems and ISO 7637-2-certified industrial equipment where 3000W surge immunity is mandatory.
FAQ
What does the 'CAH' suffix indicate in SMDJ33CAH?
The 'CAH' suffix denotes a bidirectional configuration with AEC-Q101 qualification and halogen-free construction. Unlike unidirectional 'AH' variants, SMDJ33CAH clamps transients of either polarity symmetrically-essential for protecting AC-coupled or floating signal lines such as CAN, RS-485, or Ethernet PHYs. This makes SMDJ33CAH distinct from SMDJ33AH, which functions only in one direction.
Is SMDJ33CAH compliant with ISO 7637-2 for automotive applications?
Yes, SMDJ33CAH is explicitly tested and rated to meet ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) waveforms. Its 3000W peak power rating and 53.3V clamping voltage ensure system-level compliance when used per recommended layout guidelines-including minimum 100mm² thermal pad and short trace lengths.
What is the maximum clamping voltage of SMDJ33CAH and at what current does it occur?
The maximum clamping voltage of SMDJ33CAH is 53.3V, measured at the peak pulse current (IPPM) of 56.3A under the standardized 10/1000µs double-exponential waveform. This value is guaranteed across the full operating temperature range (-55°C to +175°C) and defines the upper voltage limit imposed on protected circuits during worst-case surge events.
Can SMDJ33CAH be used in place of SMDJ33AH in a design?
No-SMDJ33CAH and SMDJ33AH are not interchangeable without circuit review. SMDJ33AH is unidirectional and conducts only in reverse bias, while SMDJ33CAH is bidirectional and clamps in both directions. Replacing one with the other may cause unintended conduction paths, increased leakage, or failure to suppress positive-going transients in DC-biased lines.
What is the thermal resistance from junction to ambient (RθJA) for SMDJ33CAH?
The junction-to-ambient thermal resistance (RθJA) for SMDJ33CAH is 75°C/W under standard JEDEC test conditions (single-layer 1 in² copper pad). This value assumes minimal PCB copper; actual performance improves significantly with internal layer thermal vias and multi-layer heatsinking-enabling sustained operation at elevated ambient temperatures in enclosed automotive modules.
SMDJ33CAH 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMDJ33CAH FAQ
1.How can I place an order for SMDJ33CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ33CAH 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 SMDJ33CAH reliable?
The price and inventory of SMDJ33CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ33CAH is usually 5 days.
3.What payment methods are accepted for SMDJ33CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ33CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ33CAH?
SMDJ33CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ33CAH 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 SMDJ33CAH?
For technical support, including SMDJ33CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ33CAH requirements.
6.How does Aetrix verify that SMDJ33CAH is sourced from the original manufacturer or authorized distributors?
All SMDJ33CAH 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 SMDJ33CAH meets industry standards.
7.What is the process for return or replacement of SMDJ33CAH?
All SMDJ33CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ33CAH, 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 SMDJ33CAH part is unused and in its original packaging.
Return procedure for SMDJ33CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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