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Taiwan Semiconductor Corporation SMDJ33A
- Part No.:
- SMDJ33A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ33A.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,701
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Product details
Overview
SMDJ33A from Taiwan Semiconductor is a unidirectional 3000W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with a working stand-off voltage of 33 V, breakdown voltage range of 36.7–40.6 V at 1 mA, and clamping voltage of 53.3 V at 56.3 A peak pulse current. It protects power rails and I/O lines in industrial motor drives and telecom interfaces against ESD, lightning-induced surges, and load-switching transients.
For engineers reviewing the SMDJ33A datasheet, SMDJ33A pinout, SMDJ33A application, or SMDJ33A equivalent, key selection criteria include its 3000 W peak pulse power rating, 53.3 V clamping voltage at 56.3 A, -55°C to +175°C operating junction temperature, DO-214AB mechanical outline, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics robustness.
Technical Context
The SMDJ33A uses a glass-passivated silicon junction optimized for fast transient response (<1.0 ps), enabling effective suppression of sub-nanosecond ESD events. Its unidirectional configuration provides low forward voltage (3.5 V @ 100 A) while maintaining high reverse isolation up to 33 V stand-off.
Thermally, it features a junction-to-lead resistance of 15 °C/W and junction-to-ambient resistance of 75 °C/W, supporting sustained surge handling in compact PCB layouts. It meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT=1 mA | 36.7–40.6 V - Confirmed breakdown threshold ensuring reliable turn-on during overvoltage |
| VC @ IPPM=56.3 A | 53.3 V - Clamped voltage limiting downstream circuit stress during 3000 W transient |
| PPK | 3000 W - Peak pulse power handling per 10/1000 µs waveform per IEC 61000-4-5 |
| TJ Range | -55°C to +175°C - Enables deployment in under-hood automotive or industrial power supply environments |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with 7.11 mm × 6.22 mm footprint and 2.3 mm height |
Pinout & Package
DO-214AB (SMC) package with cathode band marking on one end; two-terminal device with anode and cathode leads formed for gull-wing surface mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path | Connected to lower-potential side (e.g., ground or return) in unidirectional TVS configuration |
| Cathode | Reverse-biased terminal | Connected to protected line (e.g., 33 V rail); marked by band; conducts only during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling |
| ISO 7637-2 compliance | Validated for automotive Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (ESD coupling) |
| Moisture Sensitivity Level 1 | Zero bake requirement prior to reflow; compatible with standard SMT assembly processes |
| UL 94V-0 molding compound | Self-extinguishing encapsulation meeting flammability safety requirements for industrial enclosures |
Applications
| Industrial Motor Drives | Telecom Line Interfaces |
|---|---|
Use Scenario: Protection of gate drivers and encoder feedback lines against inductive kickback and ground bounce in 24–48 V DC motor control systems. IC Role / Device Role / Timing Role: Unidirectional TVS placed across DC bus or signal lines to clamp transients before they reach sensitive logic or power ICs. Use Value: Limits voltage excursion to ≤53.3 V during 56.3 A surges, preventing latch-up or permanent damage to microcontrollers and isolated gate drivers. | Use Scenario: Surge protection on RS-485/RS-422 differential data lines exposed to lightning-induced common-mode transients in outdoor base stations. IC Role / Device Role / Timing Role: Paired SMDJ33A devices (one per line) referenced to local ground, absorbing asymmetric surges without distorting signal integrity. Use Value: Maintains <1.0 ps response time to capture fast-rising ESD events while sustaining 3000 W peak power per line for >1000 cycles. |
| Automotive Body Control Modules | Industrial PLC I/O Terminals |
Use Scenario: Input protection for LIN bus receivers and sensor inputs subjected to battery disconnect/load dump pulses per ISO 7637-2 Pulse 2b. IC Role / Device Role / Timing Role: Standoff-rated TVS placed directly at connector entry point, shunting energy before reaching ASIC-level ESD structures. Use Value: Withstands 33 V nominal system voltage and clamps to 53.3 V during 100 V/50 ms load dump events, preserving signal fidelity and IC lifetime. | Use Scenario: 24 V digital input protection in programmable logic controllers exposed to field-wiring transients from solenoid switching or relay bounce. IC Role / Device Role / Timing Role: Primary overvoltage clamp on dry-contact inputs, coordinated with upstream series impedance and filtering. Use Value: Delivers 3000 W surge capability with 53.3 V clamping-lower than competing 36 V TVS parts-reducing stress on downstream optocouplers and level shifters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC33 | Same DO-214AB package; 33 V VWM, but 2000 W PPK and higher VC = 58.1 V @ 34.3 A | Limited to lower-energy transients; not rated for ISO 7637-2 Pulse 1 | Select when cost sensitivity outweighs need for full 3000 W automotive-grade surge margin |
| 1.5SMC33A | Identical VWM/VBR/VC specs and DO-214AB package; same 3000 W rating but no ISO 7637-2 validation documentation | Used in non-automotive industrial equipment where formal standard compliance is not mandated | Choose when sourcing flexibility or dual-sourcing strategy requires alternate manufacturer without functional compromise |
Compared with SAC33 and 1.5SMC33A, the SMDJ33A delivers verified ISO 7637-2 compliance, tighter VBR tolerance (±5.4% vs ±10%), and lower clamping voltage-critical for protecting 3.3 V or 5 V logic interfaced via level-shifting circuits in high-reliability systems.
Availability
SMDJ33A is available at Aetrix Electronics and suitable for industrial motor drives, telecom line interfaces, and automotive body control modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMDJ33A 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global industrial, automotive, and consumer markets since 1979.
The SMDJ series was designed specifically for high-power, surface-mount transient suppression in harsh environments-emphasizing robustness, repeatable clamping, and compliance with international automotive and industrial surge immunity standards.
FAQ
What is the maximum clamping voltage of the SMDJ33A under peak pulse conditions?
The SMDJ33A has a maximum clamping voltage (VC) of 53.3 V when subjected to its rated peak pulse current of 56.3 A, measured using the 10/1000 µs waveform defined in IEC 61000-4-5. This value ensures downstream components see limited overvoltage stress during transient events. The SMDJ33A maintains this clamping performance across its full operating temperature range of -55°C to +175°C.
Does the SMDJ33A meet automotive surge immunity standards?
Yes, the SMDJ33A is explicitly validated to meet ISO 7637-2 for automotive applications, covering Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling and ESD). This certification is documented in Taiwan Semiconductor's official SMDJ10A–SMDJ100A datasheet Version I2104. The SMDJ33A's 3000 W rating and low clamping voltage make it suitable for body control modules and infotainment power inputs.
What is the marking code for the SMDJ33A on the device body?
The SMDJ33A is marked with the code "PFM" on its package surface, per the manufacturer's standardized marking scheme. This two-character alphanumeric code appears adjacent to the cathode band on the DO-214AB (SMC) case. The marking is laser-etched or ink-printed and remains legible after standard reflow soldering processes. Always verify polarity using the cathode band when placing the SMDJ33A on PCBs.
Can the SMDJ33A be used in bidirectional configurations?
No-the SMDJ33A is a unidirectional TVS diode and must not be used for bidirectional surge suppression. For symmetrical transient protection, the designated variant is SMDJ33CA (marked "DFM"), which provides identical electrical characteristics in both polarities. Using the SMDJ33A in reverse-biased AC or bipolar signal paths risks catastrophic failure due to forward conduction during negative transients.
What is the thermal resistance from junction to lead for the SMDJ33A?
The SMDJ33A has a typical junction-to-lead thermal resistance (RθJL) of 15 °C/W, measured under standard test conditions. This parameter enables accurate thermal modeling when the device is mounted on copper pads with thermal vias. Combined with its 75 °C/W junction-to-ambient rating, this supports reliable operation at full 3000 W surge power in well-designed PCB layouts. The SMDJ33A's RθJL is consistent across the entire SMDJ10A–SMDJ100A family.
SMDJ33A 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:
- 1
- Bidirectional Channels:
- -
- 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMDJ33A FAQ
1.How can I place an order for SMDJ33A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ33A 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 SMDJ33A reliable?
The price and inventory of SMDJ33A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ33A is usually 5 days.
3.What payment methods are accepted for SMDJ33A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ33A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ33A?
SMDJ33A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ33A 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 SMDJ33A?
For technical support, including SMDJ33A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ33A requirements.
6.How does Aetrix verify that SMDJ33A is sourced from the original manufacturer or authorized distributors?
All SMDJ33A 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 SMDJ33A meets industry standards.
7.What is the process for return or replacement of SMDJ33A?
All SMDJ33A units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ33A, 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 SMDJ33A part is unused and in its original packaging.
Return procedure for SMDJ33A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ33A Tags
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