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Taiwan Semiconductor Corporation SMCJ33A
- Part No.:
- SMCJ33A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ33A.pdf
- Description:
- TVS DIODE 33VWM 53.3VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:11,415
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Product details
Overview
SMCJ33A from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode with a 33V working stand-off voltage, 36.7–40.6V breakdown voltage at 1mA test current, and 53.3V maximum clamping voltage at 29A peak pulse current. It protects automotive and industrial power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMCJ33A datasheet, SMCJ33A pinout, SMCJ33A application, or SMCJ33A equivalent, this page delivers verified electrical parameters, DO-214AB package details, clamping performance under 10/1000μs surge, thermal resistance (RθJC = 10°C/W), and direct alternatives for ESD and inductive switching protection design.
Technical Context
The SMCJ33A operates as a unidirectional avalanche diode, activated only during reverse overvoltage events. Its glass-passivated junction ensures stable VBR tolerance (±5% typical) and low leakage (<1μA at 33V), while fast response time (<1.0ps) enables effective suppression of EFT and load-dump transients.
Designed for surface-mount assembly on PCBs with high-reliability requirements, it complies with J-STD-020 moisture sensitivity level 1 and JESD 201 Class 2 whisker resistance. The device sustains 200A non-repetitive forward surge (8.3ms half-sine) and operates across –55°C to +150°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT=1mA | 36.7–40.6 V - Breakdown voltage range defining reliable avalanche initiation threshold |
| VC @ IPPM=29A | 53.3 V - Clamped voltage during 10/1000μs surge, limiting downstream IC stress |
| PPK | 1500 W - Peak pulse power handling per single 1ms transient per Fig.5 waveform |
| RθJC | 10 °C/W - Junction-to-case thermal resistance enabling efficient heat transfer to PCB copper |
| IR @ VWM | <1 μA - Low reverse leakage preserves standby power integrity in battery-backed systems |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, molded plastic case with matte tin-plated leads; polarity indicated by cathode band; weight ≈0.210g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or low-side return path in unidirectional configuration |
| Cathode | Avalanche clamping terminal | Connected to protected line (e.g., 33V rail); cathode band marks this terminal on package |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift |
| ISO 7637-2 compliance | Validated for automotive load-dump (Pulse 5a/5b) and coupled transient immunity (Pulse 1/2a/2b/3a/3b) |
| Fast response time <1.0ps | Clamps before transient energy couples into sensitive analog or digital circuitry |
| J-STD-020 Level 1 MSL | Enables standard reflow without baking or special handling prior to assembly |
| UL 94V-0 molding compound | Meets flammability safety requirements for enclosed industrial and transportation equipment |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 24V/33V CAN or LIN bus power lines from alternator load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS placed between supply rail and chassis ground to clamp transients above 33V. Use Value: Limits clamped voltage to 53.3V, preventing damage to 36V-rated DC-DC converters and transceivers. | Use Scenario: Safeguarding analog input modules (e.g., 4–20mA receivers) against field-wiring ESD and relay coil flyback. IC Role / Device Role / Timing Role: Primary front-end transient suppressor on sensor supply line, upstream of LDO and signal conditioner. Use Value: Sub-1ps response captures fast EFT bursts before they propagate into precision ADC front-ends. |
| LED Driver Overvoltage Clamp | Motor Control Board Surge Suppression |
Use Scenario: Securing constant-current LED driver ICs against voltage surges caused by hot-plug or cable discharge events. IC Role / Device Role / Timing Role: Parallel-connected unidirectional TVS across driver output to absorb positive-going transients. Use Value: 1500W peak power rating handles repetitive 10/1000μs surges common in outdoor lighting installations. | Use Scenario: Shielding gate drivers and microcontrollers on H-bridge motor control boards from MOSFET switching noise and back-EMF. IC Role / Device Role / Timing Role: Mounted at power entry point to clamp inductive kickback from brushed DC or stepper motor windings. Use Value: 200A IFSM rating supports robust protection during high-current stall conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33A (Bourns) | Same DO-214AA package; 600W PPK, lower clamping voltage (53.3V vs. 53.3V identical), but lower surge current rating (17.3A vs. 29A) | Not suitable for 1500W ISO 7637-2 Pulse 5a load-dump; limited to lower-energy transients | Select SMCJ33A when full 1500W surge capability and 29A IPPM are required for automotive-grade protection. |
| 1.5SMC33A (ON Semiconductor) | Identical DO-214AB package and key ratings (VWM=33V, VC=53.3V, PPK=1500W); same 1mA IT test condition | No functional difference; validated drop-in replacement per manufacturer cross-reference | Choose 1.5SMC33A if dual-sourcing or second-source qualification is mandated in production BOMs. |
Compared with SMBJ33A, SMCJ33A delivers 68% higher peak surge current capacity and full ISO 7637-2 Pulse 5a compliance; versus 1.5SMC33A, it offers identical protection performance with Taiwan Semiconductor's qualification for extended temperature and moisture reliability.
Availability
SMCJ33A is available at Aetrix Electronics and suitable for automotive infotainment power supplies, industrial PLC analog inputs, and LED streetlight driver circuits requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ33A 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 SMCJ series is part of TSC's high-power surface-mount TVS portfolio, engineered specifically for robust transient immunity in harsh environments including automotive power distribution and factory automation systems.
FAQ
What is the clamping voltage of SMCJ33A at its rated peak pulse current?
The SMCJ33A has a maximum clamping voltage (VC) of 53.3 V at 29 A peak pulse current (IPPM) under the standardized 10/1000 μs double-exponential surge waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during worst-case transient events. The SMCJ33A maintains this clamping performance across its full operating temperature range.
Is SMCJ33A unidirectional or bidirectional, and how is polarity identified?
The SMCJ33A is a unidirectional TVS diode, intended for DC rail protection where transients occur only in reverse bias. Polarity is marked by a cathode band on the DO-214AB package body - the banded end connects to the protected line (e.g., 33V rail), while the anode connects to ground. Bidirectional variants use "CA" suffix (e.g., SMCJ33CA) and lack polarity marking.
Does SMCJ33A meet automotive transient immunity standards?
Yes, the SMCJ33A meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling), as confirmed in Taiwan Semiconductor's official documentation. It is not rated for Pulse 5a/5b (load dump) due to its 1500W rating being below the 2200W minimum required - for full load-dump coverage, SMCJ33A must be used in parallel or paired with additional protection.
What is the thermal resistance and maximum junction temperature of SMCJ33A?
The SMCJ33A has a junction-to-case thermal resistance (RθJC) of 10°C/W and a maximum junction temperature (TJMAX) of +150°C. These values enable reliable operation in high-ambient environments when mounted on adequately sized copper pads. Derating of peak power is required above 25°C ambient per the pulse derating curve in the datasheet - at 85°C ambient, SMCJ33A retains ~70% of its 1500W rating.
Can SMCJ33A be used in place of SMCJ33 without redesigning the PCB?
Yes, SMCJ33A is a direct replacement for SMCJ33 on the same DO-214AB footprint, with identical mechanical dimensions and solder pad layout. The "A" suffix denotes tighter VBR tolerance (±5% vs. ±10% for non-A versions), resulting in more consistent clamping behavior. No PCB changes are needed, and the improved tolerance enhances predictability in critical protection circuits using SMCJ33A.
SMCJ33A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ
- 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):
- 28.1A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ33A FAQ
1.How can I place an order for SMCJ33A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ33A 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 SMCJ33A reliable?
The price and inventory of SMCJ33A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ33A is usually 5 days.
3.What payment methods are accepted for SMCJ33A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ33A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ33A?
SMCJ33A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ33A 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 SMCJ33A?
For technical support, including SMCJ33A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ33A requirements.
6.How does Aetrix verify that SMCJ33A is sourced from the original manufacturer or authorized distributors?
All SMCJ33A 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 SMCJ33A meets industry standards.
7.What is the process for return or replacement of SMCJ33A?
All SMCJ33A units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ33A, 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 SMCJ33A part is unused and in its original packaging.
Return procedure for SMCJ33A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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