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Taiwan Semiconductor Corporation SMCJ33CA
- Part No.:
- SMCJ33CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ33CA.pdf
- Description:
- TVS DIODE 33VWM 53.3VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:5,781
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Product details
Overview
SMCJ33CA from Taiwan Semiconductor is a bidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 33V working stand-off voltage (VWM), 36.7–40.6V breakdown voltage (VBR), and 53.3V maximum clamping voltage (VC) at 29A peak impulse current - designed for automotive ESD and load-dump protection in power supply rails and CAN/LIN interfaces.
For engineers reviewing the SMCJ33CA datasheet, SMCJ33CA pinout, SMCJ33CA application, or SMCJ33CA equivalent, key selection criteria include bidirectional clamping capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, <1μA reverse leakage above 10V, and DO-214AB thermal performance (RθJA = 55°C/W).
Technical Context
The SMCJ33CA employs a glass-passivated silicon junction optimized for fast transient suppression without degradation under repetitive surges. Its bidirectional configuration enables symmetrical clamping in AC-coupled or floating signal paths, eliminating polarity dependency during layout.
It meets ISO 7637-2 test requirements for automotive electronics, including Pulse 1 (inductive load dump), Pulse 2a/2b (battery disconnection), and Pulse 3a/3b (switching transients), with guaranteed clamping performance up to 1500W peak pulse power at tp = 1ms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC/AC bias margin for protected circuitry. |
| VBR min/max | 36.7 V / 40.6 V @ IT = 1 mA - Validated breakdown threshold ensures reliable turn-on within specified tolerance band under standardized test conditions. |
| VC @ IPPM | 53.3 V @ 29 A - Clamped voltage during 10/1000μs surge; determines worst-case overvoltage stress on downstream ICs. |
| PPK | 1500 W - Peak pulse power handling per IEC 61000-4-5 and ISO 7637-2; supports high-energy transients without failure. |
| IR @ VWM | <1 μA - Ultra-low leakage preserves battery life and prevents false triggering in low-power sensor nodes or always-on systems. |
| TJ max | +150 °C - Junction temperature rating enables operation in under-hood automotive environments and industrial power supplies. |
| RθJA | 55 °C/W - Thermal resistance from junction to ambient; informs PCB copper area and heatsinking requirements for sustained surge duty cycles. |
Pinout & Package
DO-214AB (SMC) surface-mount package with cathode band marking for unidirectional variants; SMCJ33CA is bidirectional and marked with "GFM" code - no polarity designation required. Case meets UL 94V-0 flammability rating; matte tin-plated leads comply with J-STD-002 solderability and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient conduction path | Either terminal serves as anode or cathode depending on instantaneous polarity of surge - eliminates orientation constraints during automated placement. |
| Case (cathode band absent) | Non-functional mechanical reference | No electrical connection; physical alignment aid only - no grounding or shielding function implied by package body. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR and low IR over lifetime, even under humidity and thermal cycling stress per J-STD-020 Level 1 moisture sensitivity. |
| Sub-1 ps response time | Clamps transients before sensitive logic or analog circuitry experiences destructive overvoltage - critical for CAN FD and LIN bus protection. |
| ISO 7637-2 compliance | Validated against Pulse 1 (inductive switch-off), Pulse 2a/2b (battery interruption), and Pulse 3a/3b (capacitive coupling) - reduces need for system-level retesting. |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU Directive 2011/65/EU - supports green manufacturing and export compliance without derating penalties. |
Applications
| Automotive Power Rail Protection | CAN/LIN Bus Transient Suppression |
|---|---|
Use Scenario: 12V/24V battery-fed ECUs exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of DC-DC converters and microcontrollers. Use Value: Limits rail voltage to ≤53.3V during 1500W ISO 7637-2 Pulse 1 events, preventing latch-up or gate oxide rupture in downstream ICs. | Use Scenario: High-speed vehicle network nodes subject to ESD and coupled switching noise. IC Role / Device Role / Timing Role: Bidirectional line protector across differential CAN H/L or LIN bus lines. Use Value: Symmetrical clamping maintains signal integrity during ±15kV contact ESD (IEC 61000-4-2) while adding <0.5pF parasitic capacitance. |
| Industrial Sensor Interface Protection | LED Driver Input Stage Clamp |
Use Scenario: 4–20mA loop-powered sensors connected to PLC analog inputs in factory automation. IC Role / Device Role / Timing Role: Front-end TVS on signal/power pair to absorb field-induced surges and cable discharge events. Use Value: Withstands >100,000 surge cycles at 29A without parameter shift - extends maintenance intervals in harsh electromagnetic environments. | Use Scenario: Constant-current LED drivers powered from unregulated AC/DC adapters. IC Role / Device Role / Timing Role: Input-stage surge limiter protecting bridge rectifier and primary-side controller. Use Value: Clamps 10/1000μs surges to 53.3V while maintaining <1μA leakage - avoids standby power loss and false tripping in dimming circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA (Bourns) | Same DO-214AA package; 600W PPK rating vs. SMCJ33CA's 1500W - lower surge energy handling. | Preferred where space is constrained but surge threat level is moderate (e.g., consumer IoT). | Select SMBJ33CA only if peak transient energy remains below 600W; verify clamping voltage (VC = 53.3V same) and leakage match. |
| P6SMB33CA (Littelfuse) | DO-214AA package; identical 1500W rating and VWM/VBR/VC specs - direct functional match with alternate marking. | Drop-in replacement where BOM consolidation across Littelfuse-supplied designs is required. | P6SMB33CA offers identical electrical performance and ISO 7637-2 compliance; verify tape-and-reel packaging compatibility with SMT line. |
Compared with SMBJ33CA, SMCJ33CA delivers 2.5× higher surge power handling in a slightly larger DO-214AB footprint - justifying use in automotive and industrial applications with severe load-dump threats; versus P6SMB33CA, it shares identical ratings but differs in manufacturer qualification and traceability documentation.
Availability
SMCJ33CA is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface protection, and LED driver input stage clamping requiring stable component supply and full ISO 7637-2 compliance.
Supply support for SMCJ33CA 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, and rectifiers - headquartered in Hsinchu Science Park with global distribution.
The SMCJ series was developed specifically for high-energy transient suppression in automotive and industrial power systems, emphasizing robustness under ISO 7637-2 and AEC-Q101 stress conditions.
FAQ
What is the clamping voltage of SMCJ33CA and how is it measured?
The SMCJ33CA has a maximum clamping voltage (VC) of 53.3 V, measured at 29 A peak impulse current (IPPM) using a 10/1000 μs double-exponential surge waveform per IEC 61000-4-5. This value represents the upper limit of voltage seen by protected circuitry during worst-case transient events - confirmed in the official Taiwan Semiconductor datasheet revision S2104, Table on page 3.
Is SMCJ33CA unidirectional or bidirectional, and how does that affect PCB layout?
SMCJ33CA is a bidirectional TVS diode, indicated by the "CA" suffix per Taiwan Semiconductor's ordering convention. It provides symmetrical clamping in both polarities, so no orientation is required during placement - unlike unidirectional variants (e.g., SMCJ33A), which require cathode-band alignment. This simplifies layout and eliminates risk of reverse installation in automated assembly.
Does SMCJ33CA meet automotive qualification standards such as AEC-Q101?
While the SMCJ33CA datasheet confirms compliance with ISO 7637-2 (Pulse 1/2a/2b/3a/3b) and JEDEC moisture sensitivity Level 1, Taiwan Semiconductor does not explicitly list AEC-Q101 qualification for this specific variant in revision S2104. Engineers requiring AEC-Q101 must consult TSC's qualified parts list or request test reports directly from the manufacturer before deployment in automotive safety-critical systems.
What is the thermal resistance of SMCJ33CA and how does it impact board design?
The SMCJ33CA has a junction-to-ambient thermal resistance (RθJA) of 55 °C/W, measured in free-air conditions per JEDEC JESD51-2. To maintain TJ ≤ 150 °C during repeated surges, PCB layout must provide ≥ 100 mm² of 2-oz copper connected to both terminals - verified via thermal simulation or empirical testing under worst-case ambient and pulse repetition rates.
Can SMCJ33CA replace SMCJ33A in an existing design?
SMCJ33CA can replace SMCJ33A only if the circuit requires bidirectional clamping - for example, across AC-coupled lines or floating references. However, SMCJ33A is unidirectional (cathode-marked) and clamps only in reverse bias; substituting SMCJ33CA introduces symmetrical conduction that may alter biasing in DC-coupled rails. Always validate functionality and leakage behavior in-system before substitution.
SMCJ33CA 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:
- -
- Bidirectional Channels:
- 2
- 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)
SMCJ33CA FAQ
1.How can I place an order for SMCJ33CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ33CA 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 SMCJ33CA reliable?
The price and inventory of SMCJ33CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ33CA is usually 5 days.
3.What payment methods are accepted for SMCJ33CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ33CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ33CA?
SMCJ33CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ33CA 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 SMCJ33CA?
For technical support, including SMCJ33CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ33CA requirements.
6.How does Aetrix verify that SMCJ33CA is sourced from the original manufacturer or authorized distributors?
All SMCJ33CA 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 SMCJ33CA meets industry standards.
7.What is the process for return or replacement of SMCJ33CA?
All SMCJ33CA units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ33CA, 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 SMCJ33CA part is unused and in its original packaging.
Return procedure for SMCJ33CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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