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Taiwan Semiconductor Corporation SMBJ33H
- Part No.:
- SMBJ33H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ33H.pdf
- Description:
- 600W, 40.8V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:5,468
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Product details
Overview
SMBJ33H from Taiwan Semiconductor is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode designed for automotive-grade ESD and surge protection in power rails and signal lines. It features a 33V working stand-off voltage (VWM), 36.7–44.9V breakdown voltage (VBR), 59.0V clamping voltage (VC) at 10.6A peak pulse current, and AEC-Q101 qualification for under-hood applications.
For engineers reviewing the SMBJ33H datasheet, SMBJ33H pinout, SMBJ33H application, or SMBJ33H equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, unidirectional polarity marking, DO-214AA (SMB) package thermal resistance (RθJA = 55°C/W), and leakage current ≤1µA at 33V.
Technical Context
The SMBJ33H operates as a unidirectional avalanche diode with glass-passivated junction, enabling fast response (<1.0ps) to transients while maintaining low leakage (<1µA @ VWM). Its 600W peak pulse power rating (10/1000µs waveform) supports robust protection against load dump and inductive switching events in 12V/24V automotive systems.
Thermal design is enabled by RθJC = 10°C/W and RθJA = 55°C/W, allowing reliable operation up to TJ = +150°C. The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements, confirming suitability for high-reliability PCB assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous DC or RMS voltage the device blocks without conduction |
| VBR min/max | 36.7 V / 44.9 V - Breakdown occurs within this range at 1 mA test current; defines turn-on threshold tolerance |
| VC @ IPP | 59.0 V at 10.6 A - Clamped voltage during 10/1000µs surge; determines protected circuit's maximum transient exposure |
| PPK | 600 W - Peak pulse power handling capability per single 10/1000µs transient event |
| ID @ VWM | ≤1 µA - Low leakage ensures minimal standby power loss and signal integrity in high-impedance circuits |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments |
| Package | DO-214AA (SMB) - Standardized surface-mount outline with cathode band marking and 0.090g mass |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band on unidirectional variants. Weight ≈ 0.090 g. Meets J-STD-020 moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to ground or low-side reference in unidirectional TVS configurations |
| Cathode | Current exit point during reverse-biased clamping | Connected to protected line (e.g., CAN_H, LIN, 12V rail); cathode band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including temperature cycling, HTRB, and ESD |
| Glass passivated junction | Enhances long-term reliability and stability of breakdown voltage under thermal and humidity stress |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (PEM noise) |
| Fast response time | Typically <1.0 ps - limits voltage overshoot before clamping engages, critical for protecting fast logic ICs |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally constrained designs |
Applications
| Automotive Power Rail Protection | CAN Bus Transient Suppression |
|---|---|
Use Scenario: Protecting 12V battery-fed ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp surges above 33V. Use Value: Limits peak voltage to 59.0V during 10/1000µs 600W pulses, preventing damage to downstream regulators and microcontrollers. |
Use Scenario: Safeguarding CAN_H/CAN_L lines against ESD and coupled transients in vehicle networks. IC Role / Device Role / Timing Role: Unidirectional SMBJ33H used on CAN_H with cathode to line, anode to ground. Use Value: Clamps fast transients (<1.0ps response) while maintaining <1µA leakage at 33V, preserving bus signal integrity. |
| Industrial Sensor Interface Protection | LED Driver Input Stage Protection |
Use Scenario: Shielding analog sensor inputs (e.g., pressure, temperature) from EFT and surge coupling. IC Role / Device Role / Timing Role: TVS placed at connector entry point, cathode to signal line, anode to system ground. Use Value: 59.0V clamping ensures downstream op-amps and ADCs remain within absolute maximum ratings during 10.6A transients. |
Use Scenario: Guarding constant-current LED driver ICs against input overvoltage during hot-swap or supply faults. IC Role / Device Role / Timing Role: Unidirectional suppression on DC input rail upstream of driver IC. Use Value: 600W peak power rating handles repetitive 12V rail surges without degradation; AEC-Q101 ensures longevity in harsh thermal cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ33A | Same DO-214AC (SMA) package; 33V VWM, 59.0V VC @ 10.6A, but lower PPK = 400W | Lower surge energy handling; suitable only for non-automotive or lower-risk transients | Select SMBJ33H when ISO 7637-2 Pulse 1 or 600W-level protection is required |
| ON Semiconductor SMCJ33A | DO-214AB (SMC) package; same 33V VWM and 59.0V VC, but higher PPK = 1500W and larger footprint | Over-engineered for space-constrained boards; requires PCB layout change | Choose SMBJ33H for AEC-Q101 compliance and optimal size/power balance in SMB footprints |
Compared with SMAJ33A, SMBJ33H delivers 50% higher peak power (600W vs. 400W) and automotive qualification; versus SMCJ33A, it retains identical electrical clamping but reduces board area by ~40% using the smaller DO-214AA package.
Availability
SMBJ33H is available at Aetrix Electronics and suitable for automotive power rail protection, CAN bus interface hardening, industrial sensor front-end safeguarding, and LED driver input stage surge suppression requiring stable component supply across production lifecycles.
Supply support for SMBJ33H 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 automotive, industrial, and consumer markets.
The SMBJH series was developed specifically for AEC-Q101-compliant transient suppression in automotive electronics, emphasizing low clamping voltage, fast response, and robust thermal performance in compact SMB packages.
FAQ
What is the clamping voltage of SMBJ33H and how is it measured?
The SMBJ33H has a maximum clamping voltage (VC) of 59.0 V, measured at a peak pulse current (IPP) of 10.6 A with a 10/1000 µs waveform. This value is guaranteed per the manufacturer's electrical specifications table and reflects the maximum voltage seen across the device during standardized surge testing - critical for ensuring downstream components remain within safe operating limits. SMBJ33H maintains this clamping performance across its full operating temperature range.
Is SMBJ33H suitable for bidirectional transient protection?
No, SMBJ33H is a unidirectional TVS diode, intended for protection of DC power rails or single-polarity signal lines where the cathode connects to the protected line and the anode to ground. For bidirectional applications such as AC lines or differential buses like RS-485, the SMBJ33AH variant (with "AH" suffix) must be used instead, as it is explicitly rated for symmetrical clamping in both directions.
Does SMBJ33H meet automotive qualification standards?
Yes, SMBJ33H is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements. It also complies with JESD201 Class 2 whisker resistance, J-STD-020 moisture sensitivity level 1, and UL 94V-0 flammability - confirming its suitability for under-hood and body-control module applications in passenger and commercial vehicles.
What is the leakage current specification for SMBJ33H at its working voltage?
SMBJ33H exhibits a maximum blocking leakage current (ID) of 1 µA when biased at its rated working stand-off voltage (VWM) of 33 V. This low leakage ensures minimal power loss in always-on systems and preserves signal integrity in high-impedance sensor interfaces. The specification is verified at TA = 25°C and remains stable across the full -55°C to +150°C junction temperature range.
How does the DO-214AA (SMB) package of SMBJ33H compare thermally to larger packages like SMC?
The DO-214AA (SMB) package of SMBJ33H provides a junction-to-ambient thermal resistance (RθJA) of 55°C/W and junction-to-case resistance (RθJC) of 10°C/W. While larger SMC packages offer lower RθJA (~35°C/W), the SMB footprint enables high-density layouts without sacrificing reliability - especially when paired with adequate copper pour and thermal vias. SMBJ33H's 150°C max junction temperature ensures robust operation even in compact, thermally constrained automotive modules.
SMBJ33H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJH
- 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):
- 10.6A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ33H FAQ
1.How can I place an order for SMBJ33H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ33H 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 SMBJ33H reliable?
The price and inventory of SMBJ33H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ33H is usually 5 days.
3.What payment methods are accepted for SMBJ33H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ33H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ33H?
SMBJ33H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ33H 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 SMBJ33H?
For technical support, including SMBJ33H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ33H requirements.
6.How does Aetrix verify that SMBJ33H is sourced from the original manufacturer or authorized distributors?
All SMBJ33H 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 SMBJ33H meets industry standards.
7.What is the process for return or replacement of SMBJ33H?
All SMBJ33H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ33H, 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 SMBJ33H part is unused and in its original packaging.
Return procedure for SMBJ33H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ33H Tags
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