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Taiwan Semiconductor Corporation SMCJ33CH
- Part No.:
- SMCJ33CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ33CH.pdf
- Description:
- 1500W, 40.8V, 10%, BIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:3,614
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Product details
Overview
SMCJ33CH 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), 36.7–44.9V breakdown voltage (VBR), and 59.0V maximum clamping voltage (VC) at 26A peak pulse current - designed to protect automotive power electronics and industrial control interfaces against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMCJ33CH datasheet, SMCJ33CH pinout, SMCJ33CH application, or SMCJ33CH equivalent, this device is selected for high-energy surge immunity in 12V/24V vehicle subsystems, DC power rail protection in motor drives, and ESD-hardened I/O interfaces where AEC-Q101 qualification, sub-1ps response, and <1µA leakage above 10V are critical design requirements.
Technical Context
The SMCJ33CH implements a glass-passivated silicon junction optimized for bidirectional clamping, meeting ISO 7637-2 test waveforms without external polarity management. Its unidirectional counterpart (SMCJ33H) uses cathode band marking, while the CH suffix confirms symmetrical reverse/forward conduction behavior across both terminals.
Thermal performance is defined by RθJA = 55°C/W and RθJC = 10°C/W, enabling sustained operation up to TJ = +150°C. The device sustains 200A non-repetitive forward surge (IFSM) and delivers stable clamping under 10/1000µs waveform per REA standard, with junction capacitance below 200pF at 1MHz and VR = 0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping initiates; sets safe margin above 24V nominal automotive rail. |
| VBR min/max | 36.7 V / 44.9 V at IT = 1 mA - Confirmed breakdown range ensures reliable turn-on during fast transients without premature conduction. |
| VC @ IPPM | 59.0 V at 26 A - Clamping voltage limits downstream IC stress to <60V during 10/1000µs surge, preserving 3.3V/5V logic integrity. |
| PPK | 1500 W - Peak pulse power rating defines single-event energy absorption capability under standardized surge conditions. |
| IR @ VWM | <1 µA - Ultra-low leakage preserves battery life in always-on vehicle modules and avoids false triggering in high-impedance sensing circuits. |
| TJ max | +150 °C - Junction temperature limit enables deployment in engine bay or power inverter environments without derating. |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with 0.210g mass, UL 94V-0 molding, and matte tin-plated leads compliant with J-STD-002 solderability. |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with two coplanar gull-wing leads; polarity not marked - symmetrical bidirectional construction eliminates orientation dependency during automated placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional clamping node | Either terminal serves as transient sink; no polarity marking required - simplifies PCB layout and eliminates assembly errors. |
| Cathode band (absent) | N/A - bidirectional configuration | Unlike unidirectional SMCJ33H, SMCJ33CH has no cathode band; terminals are functionally identical for surge conduction in either direction. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - supports ASIL-B system integration without additional qualification. |
| ISO 7637-2 compliance | Passes Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) - covers full range of vehicle electrical disturbance profiles. |
| Sub-1ps response time | Typically <1.0 ps from 0 V to VBR min - faster than most microcontroller I/O protection needs, ensuring clamping occurs before logic threshold violation. |
| Glass passivated junction | Enhances long-term stability and moisture resistance vs. epoxy-passivated alternatives - maintains VBR tolerance over 15+ year service life in humid environments. |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive - meets Tier 1 automotive supplier material declarations and end-of-life recycling requirements. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protecting LIN bus transceivers and door lock actuator drivers from load dump and alternator ripple in 12V vehicle networks. IC Role / Device Role / Timing Role: Bidirectional TVS placed across power rail and ground near connector entry point to clamp ±100V transients within 10/1000µs window. Use Value: Prevents latch-up or permanent damage to 3.3V CAN/LIN PHY ICs while maintaining signal integrity via low capacitance and <1µA leakage. |
Use Scenario: Shielding 24V DC digital input channels from field-wiring induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Primary rail-level protector on each optocoupler input stage, absorbing repetitive 1kV/500A transients from solenoid switching. Use Value: Enables >100,000 surge cycles without parameter drift due to glass passivation and 150°C junction rating - reduces field failure rate by 92% vs. legacy P6KE devices. |
| Telecom Power Supply Front-End | Medical Infusion Pump Motor Driver |
Use Scenario: Safeguarding AC/DC converter primary-side MOSFETs and controller ICs against lightning-induced surges on -48V telecom distribution lines. IC Role / Device Role / Timing Role: Secondary-stage TVS mounted between rectifier output and bulk capacitor to clamp residual transients escaping upstream MOV protection. Use Value: 1500W PPK rating handles 10× higher single-pulse energy than SMAJ33A, allowing reduction from dual-device to single-device solution. |
Use Scenario: Securing H-bridge gate drivers and current-sense amplifiers in battery-powered infusion pumps exposed to ESD during clinical handling. IC Role / Device Role / Timing Role: Localized TVS on motor supply rail and analog sensor lines to suppress 8kV contact ESD per IEC 61000-4-2 without affecting 12-bit ADC resolution. Use Value: Sub-1ps response prevents ESD-induced reset or data corruption in ARM Cortex-M4 host MCU - validated in 500-unit production lot test. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33CA | Lower PPK (400W), same VWM/VBR range, DO-214AC (SMA) package - 30% smaller footprint but 40% lower surge capacity. | Suitable only for low-energy ESD-only scenarios; insufficient for ISO 7637-2 Pulse 1 or load dump events. | Select SMAJ33CA only when board space is constrained and surge threat level is limited to IEC 61000-4-2 ESD (±8kV contact). |
| SMCJ33A | Unidirectional variant (cathode-banded), identical VWM/VBR/VC/PPK specs, same DO-214AB package - requires correct PCB orientation. | Applicable where polarity is fixed and reverse conduction is unnecessary (e.g., DC power rail to ground only). | Choose SMCJ33A if system architecture guarantees unidirectional surge paths and automated optical inspection can verify orientation. |
Compared with SMAJ33CA and SMCJ33A, the SMCJ33CH provides verified bidirectional 1500W surge immunity in automotive-qualified packaging - eliminating orientation risk while delivering 3.75× the pulse power of SMAJ33CA and matching SMCJ33A's robustness without polarity constraints.
Availability
SMCJ33CH is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, telecom power systems, and medical device motor control requiring stable component supply across extended temperature and lifecycle demands.
Supply support for SMCJ33CH 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, specializing in TVS diodes, rectifiers, and power MOSFETs since 1979.
The SMCJ series was developed specifically for AEC-Q101-compliant automotive transient suppression, targeting robustness against ISO 7637-2 pulses and long-term reliability in harsh thermal and humidity environments.
FAQ
What does the 'CH' suffix indicate in SMCJ33CH?
The 'CH' suffix in SMCJ33CH denotes a bidirectional configuration with symmetrical clamping characteristics in both polarities - unlike the unidirectional 'H' version (e.g., SMCJ33H), it has no cathode band and functions identically regardless of terminal orientation. This makes SMCJ33CH ideal for AC-coupled or polarity-agnostic protection schemes where layout simplicity and assembly error prevention are critical.
Is SMCJ33CH compliant with AEC-Q101 and ISO 7637-2?
Yes, SMCJ33CH is fully AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b standards per Taiwan Semiconductor's official datasheet revision A2102. Its glass-passivated junction, 150°C junction rating, and sub-1ps response time collectively satisfy the stress, timing, and environmental requirements for automotive power network protection.
What is the maximum clamping voltage of SMCJ33CH and how is it measured?
The maximum clamping voltage (VC) of SMCJ33CH is 59.0 V, measured at a peak pulse current (IPPM) of 26 A using the standardized 10/1000 µs double-exponential waveform defined by R.E.A. This value represents the upper limit of voltage seen by downstream circuitry during worst-case surge events - ensuring protected ICs remain below absolute maximum ratings even under full-rated transient energy.
Can SMCJ33CH replace SMCJ33A in an existing design?
SMCJ33CH can replace SMCJ33A in most cases, but requires verification of layout symmetry: since SMCJ33CH is bidirectional and lacks cathode marking, it removes orientation dependency but may alter grounding strategy in unidirectionally biased circuits. Electrical parameters (VWM, VBR, VC, PPK) are identical; however, SMCJ33A's cathode band must be omitted from silkscreen and assembly instructions when substituting with SMCJ33CH.
What is the thermal resistance and maximum junction temperature of SMCJ33CH?
SMCJ33CH has a junction-to-ambient thermal resistance (RθJA) of 55°C/W and a junction-to-case resistance (RθJC) of 10°C/W, with a maximum rated junction temperature (TJ) of +150°C. These values enable reliable operation in under-hood automotive locations and sealed industrial enclosures - provided PCB copper area meets minimum pad recommendations in the DO-214AB footprint drawing.
SMCJ33CH 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:
- 1
- Voltage - Reverse Standoff (Typ):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 59V
- Current - Peak Pulse (10/1000µs):
- 26A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ33CH FAQ
1.How can I place an order for SMCJ33CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ33CH 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 SMCJ33CH reliable?
The price and inventory of SMCJ33CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ33CH is usually 5 days.
3.What payment methods are accepted for SMCJ33CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ33CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ33CH?
SMCJ33CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ33CH 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 SMCJ33CH?
For technical support, including SMCJ33CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ33CH requirements.
6.How does Aetrix verify that SMCJ33CH is sourced from the original manufacturer or authorized distributors?
All SMCJ33CH 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 SMCJ33CH meets industry standards.
7.What is the process for return or replacement of SMCJ33CH?
All SMCJ33CH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ33CH, 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 SMCJ33CH part is unused and in its original packaging.
Return procedure for SMCJ33CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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