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Taiwan Semiconductor Corporation SMCJ33H
- Part No.:
- SMCJ33H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ33H.pdf
- Description:
- 1500W, 40.8V, 10%, UNIDIRECTIONA
- Quantity:
- Payment:
- Shipping:
Inventory:6,766
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Product details
Overview
SMCJ33H from Taiwan Semiconductor is a unidirectional 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 for automotive-grade ESD and surge protection in power supply rails and signal lines.
For engineers reviewing the SMCJ33H datasheet, SMCJ33H pinout, SMCJ33H application, or SMCJ33H equivalent, key selection criteria include AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, <1.0ps response time, ≤1μA reverse leakage at VWM, and thermal resistance (RθJA = 55°C/W) for high-reliability industrial and automotive PCB layouts.
Technical Context
The SMCJ33H employs a glass-passivated silicon junction optimized for fast transient suppression in unidirectional configurations. Its clamping behavior is characterized by a 59.0V VC at 26A IPPM under 10/1000μs waveform, with junction temperature range of –55°C to +150°C and thermal resistance RθJC = 10°C/W enabling robust thermal management in high-power surge events.
It meets ISO 7637-2 for automotive load-dump and switching transients, supports automated SMT placement, and features matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance - all within a UL 94V-0 molded DO-214AB package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC rail margin. |
| VBR min/max | 36.7 V / 44.9 V @ IT = 1 mA - Confirmed breakdown threshold range ensuring predictable turn-on during overvoltage events. |
| VC @ IPPM | 59.0 V @ 26 A - Clamping voltage under standardized 10/1000μs surge; determines protected circuit's peak stress level. |
| PPK | 1500 W - Peak pulse power rating for non-repetitive 1ms surges; defines single-event energy handling capability. |
| IR @ VWM | ≤1 μA - Reverse leakage current at rated stand-off voltage; ensures minimal standby power loss and signal integrity. |
| RθJA | 55 °C/W - Junction-to-ambient thermal resistance; informs heatsinking requirements for sustained surge duty cycles. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, unidirectional configuration with cathode band marking. Case meets UL 94V-0 flammability rating; terminals are matte tin-plated per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side for unidirectional clamping | Connected to protected line (e.g., 33V rail); conducts during reverse surge to shunt current to ground. |
| Cathode | Output/Ground reference side | Connected to system ground; polarity-marked band identifies this terminal; defines conduction direction. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood and powertrain applications per stress test requirements including HTOL, TCT, and ESD. |
| ISO 7637-2 compliance | Rated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) waveforms. |
| Glass passivated junction | Enhances long-term reliability and moisture resistance vs. epoxy-passivated alternatives; supports J-STD-020 MSL Level 1. |
| Fast response time | Typically <1.0 ps from 0 V to VBR min - enables sub-nanosecond clamping onset to protect sensitive downstream ICs. |
| Low clamping ratio | VC/VBR ≈ 1.33 (59.0 V / 44.9 V max) - indicates efficient voltage limiting with minimal overvoltage overshoot. |
Applications
| Automotive Power Rail Protection | Industrial DC Power Input |
|---|---|
Use Scenario: Protecting 33V battery-fed ECUs (e.g., body control modules) against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between 33V rail and chassis ground to clamp surges before they reach LDOs and microcontrollers. Use Value: Limits peak voltage to 59.0V during 26A transients, preventing damage to 40V-rated input stages while maintaining AEC-Q101 compliance. |
Use Scenario: Safeguarding 33V industrial PLC I/O power inputs exposed to relay coil flyback and motor drive noise. IC Role / Device Role / Timing Role: Primary surge suppression device on main DC input, coordinated with upstream fuses and downstream π-filters. Use Value: Absorbs 1500W pulses without degradation, enabling reliable operation in harsh factory environments with frequent switching events. |
| Telecom Line Interface | Renewable Energy Charge Controller |
Use Scenario: Shielding RS-485 transceivers and Ethernet PHYs powered from local 33V supplies in outdoor telecom cabinets. IC Role / Device Role / Timing Role: Secondary-level TVS on local 33V bias rail, complementing primary gas discharge tube (GDT) front-end protection. Use Value: Responds in <1.0ps to fast-rising ESD events (IEC 61000-4-2), clamping to 59.0V before transceiver latch-up occurs. |
Use Scenario: Protecting MPPT controller inputs connected to 33V nominal solar array strings subject to lightning-induced surges. IC Role / Device Role / Timing Role: Final-stage clamping device on PV input rail, placed after series fuse and MOV-based coarse protection. Use Value: Withstands repeated 10/1000μs surges up to 26A while maintaining ≤1μA leakage - preserving efficiency in low-power sleep modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A | Lower PPK (400W), SMA package (smaller footprint), higher VC (71.4V @ 5.9A) | Not suitable for 1500W ISO 7637-2 Pulse 1; limited to lower-energy transients in space-constrained consumer designs. | Select only if surge energy is ≤400W and board area is critical; verify clamping margin with downstream 40V-rated components. |
| SMCJ33A | Same package and PPK, but tighter VBR tolerance (36.7–40.6V), lower VC (53.3V @ 29A), and A-suffix denotes enhanced process control | Offers improved clamping consistency and lower let-through voltage in high-volume automotive production where parameter spread matters. | Prefer for new AEC-Q101-compliant designs requiring tighter VBR distribution and lower VC - no PCB change required. |
Compared with SMAJ33A, SMCJ33H delivers 3.75× higher surge power handling and lower clamping voltage; versus SMCJ33A, it trades slightly wider VBR range for broader manufacturing availability and identical mechanical fit - making it ideal for cost-sensitive, high-reliability industrial deployments.
Availability
SMCJ33H is available at Aetrix Electronics and suitable for automotive electronics, industrial power supplies, and telecom infrastructure requiring stable component supply with AEC-Q101 qualification and ISO 7637-2 compliance.
Supply support for SMCJ33H 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 protection devices since 1995.
The SMCJ33H belongs to TSC's AEC-Q101-qualified SMCJ-H series, engineered specifically for high-energy transient suppression in automotive and industrial 12–170V systems where reliability under extreme thermal and electrical stress is mandatory.
FAQ
What is the polarity configuration of the SMCJ33H?
The SMCJ33H is a unidirectional TVS diode, meaning it conducts only when the cathode is biased positive relative to the anode. The cathode is marked by a band on the DO-214AB package body. This configuration provides low-leakage protection for DC rails like 33V automotive supplies, and its behavior differs fundamentally from bidirectional variants (e.g., SMCJ33CH) which protect AC or differential signals.
Does the SMCJ33H meet automotive qualification standards?
Yes, the SMCJ33H is AEC-Q101 qualified and explicitly tested to ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b waveforms. Its construction - including glass passivation, JESD 201 Class 2 whisker resistance, and MSL Level 1 moisture sensitivity - satisfies full automotive component stress requirements for under-hood and powertrain applications.
What is the maximum clamping voltage of the SMCJ33H and under what test condition?
The SMCJ33H has a maximum clamping voltage (VC) of 59.0 V, measured at a peak pulse current (IPPM) of 26 A using the standardized 10/1000 μs double-exponential surge waveform defined in Fig.5 of the datasheet. This value represents the worst-case voltage seen by downstream circuitry during a full-energy transient event.
How does the SMCJ33H compare to the SMCJ33AH variant?
The SMCJ33H has a wider breakdown voltage range (36.7–44.9 V) than the SMCJ33AH (36.7–40.6 V), resulting in a higher maximum clamping voltage (59.0 V vs. 53.3 V). Both share identical package, power rating (1500 W), and AEC-Q101 qualification, but the SMCJ33AH offers tighter VBR control for designs demanding consistent clamping thresholds across production lots.
Can the SMCJ33H be used in bidirectional signal protection?
No - the SMCJ33H is strictly unidirectional and unsuitable for AC or differential-line protection. For bidirectional applications such as RS-485 or CAN bus, use the SMCJ33CH or SMCJ33CAH variants, which feature symmetrical breakdown in both directions and are explicitly characterized for bipolar operation per the datasheet's "Devices for bipolar applications" section.
SMCJ33H 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:
- 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)
SMCJ33H FAQ
1.How can I place an order for SMCJ33H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ33H 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 SMCJ33H reliable?
The price and inventory of SMCJ33H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ33H is usually 5 days.
3.What payment methods are accepted for SMCJ33H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ33H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ33H?
SMCJ33H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ33H 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 SMCJ33H?
For technical support, including SMCJ33H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ33H requirements.
6.How does Aetrix verify that SMCJ33H is sourced from the original manufacturer or authorized distributors?
All SMCJ33H 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 SMCJ33H meets industry standards.
7.What is the process for return or replacement of SMCJ33H?
All SMCJ33H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ33H, 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 SMCJ33H part is unused and in its original packaging.
Return procedure for SMCJ33H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ33H Tags
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