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Taiwan Semiconductor Corporation SMBJ33
- Part No.:
- SMBJ33
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ33.pdf
- Description:
- 600W, 40.8V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:4,184
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Product details
Overview
SMBJ33 from Taiwan Semiconductor is a unidirectional 33 V standoff, 600 W surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed to clamp ESD and lightning-induced surges in power rails and signal lines. It delivers 10.6 A peak impulse current (IPP), clamps to 59.0 V at that current, and exhibits <1 µA leakage above 33 V.
For engineers reviewing the SMBJ33 datasheet, SMBJ33 pinout, SMBJ33 application, or SMBJ33 equivalent, key selection criteria include its 33 V working stand-off voltage, 59.0 V maximum clamping voltage at 10.6 A, DO-214AA mechanical compatibility, unidirectional polarity marking, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive transients.
Technical Context
The SMBJ33 operates as a silicon avalanche diode optimized for fast transient suppression using a glass-passivated junction. Its sub-1 ps response time enables protection against ESD (IEC 61000-4-2) and electrical fast transients (IEC 61000-4-4), while its 150 °C max junction temperature supports operation in under-hood automotive and industrial environments.
It is rated for 600 W non-repetitive peak pulse power (10/1000 µs waveform), with thermal resistance of 10 °C/W (junction-to-case) and 55 °C/W (junction-to-ambient). The device features matte tin-plated leads compliant with J-STD-002 and meets JESD 201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min / max | 36.7 V / 44.9 V - Breakdown occurs within this range at 1 mA test current; ensures reliable turn-on margin |
| VC @ IPP | 59.0 V - Clamped voltage seen by protected circuit during 10.6 A surge (10/1000 µs) |
| IPP | 10.6 A - Peak surge current capability under standard 10/1000 µs waveform |
| ID @ VWM | <1 µA - Extremely low leakage preserves system standby power integrity |
| PPK | 600 W - Peak pulse power handling capacity defines transient energy absorption limit |
| TJ max | +150 °C - Enables use in high-temperature PCB locations without derating concerns |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking on one end; body dimensions: 4.57 mm × 3.94 mm × 2.29 mm (L × W × H); weight ≈ 0.090 g; RoHS-compliant, halogen-free molding compound (UL 94V-0).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or lower-potential rail in unidirectional configuration |
| Cathode | High-side connection point | Connected to protected line (e.g., 33 V supply or signal); marked with band |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable breakdown voltage and long-term reliability under repeated surge stress |
| Fast response time <1 ps | Clamps transients before sensitive downstream ICs experience overvoltage damage |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive load-dump and inductive-switching immunity requirements |
| J-STD-020 Level 1 moisture sensitivity | Enables standard SMT reflow without baking or special handling |
| Matte tin-plated leads | Guarantees solderability per J-STD-002 and eliminates whisker risk (JESD 201 Class 2) |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 33 V auxiliary power rails in vehicle ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between rail and chassis ground to clamp surges exceeding 33 V. Use Value: Limits voltage to ≤59.0 V during 10.6 A transients, preventing damage to 36 V-rated regulators and microcontrollers. | Use Scenario: Safeguarding analog sensor inputs (e.g., pressure, temperature) connected to 33 V supply domains. IC Role / Device Role / Timing Role: Standoff diode across sensor supply and ground to absorb coupling noise and ESD events. Use Value: Sub-1 µA leakage avoids DC offset errors; 59.0 V clamping prevents ADC input saturation during fast transients. |
| LED Driver Output Protection | Telecom Line Card Surge Suppression |
Use Scenario: Shielding constant-current LED driver outputs from inductive kickback when switching high-power strings. IC Role / Device Role / Timing Role: TVS placed across output terminals to shunt flyback energy during MOSFET turn-off. Use Value: 600 W peak power rating absorbs repetitive 10/1000 µs surges without degradation; DO-214AA footprint fits compact LED modules. | Use Scenario: Front-end protection on 33 V bias rails of telecom line interface cards exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping device on DC feed line before DC-DC converter input. Use Value: Meets IEC 61000-4-5 Level 3 (1 kV/2 kA) surge immunity when used with series impedance; UL 94V-0 housing enhances fire safety. |
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 | Lower VBR range (36.7–40.6 V vs. 36.7–44.9 V); tighter breakdown tolerance | Better suited for systems requiring tighter clamping consistency across temperature and unit variance | Select SMBJ33A when design margins demand reduced VBR spread; same DO-214AA package and pinout |
| SMCJ33 | Higher PPK (1500 W), larger DO-214AB (SMC) package, higher IPP (27.3 A), VC = 53.3 V | Used where higher surge energy (e.g., 10/1000 µs >15 A) must be absorbed without replacement-level layout change | Choose SMCJ33 only if board space allows larger footprint and higher surge robustness is required; not drop-in compatible |
Compared with SMBJ33A, the SMBJ33 offers broader VBR tolerance but identical clamping performance (59.0 V) and leakage; versus SMCJ33, it trades surge capacity for smaller size-critical for space-constrained 33 V rail protection where 10.6 A IPP suffices.
Availability
SMBJ33 is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, LED lighting drivers, and telecom line card designs requiring stable component supply and full traceability.
Supply support for SMBJ33 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 SMBJ series was developed specifically for surface-mount transient suppression in space-constrained, high-reliability applications demanding ISO 7637-2 compliance and J-STD-020 Level 1 handling.
FAQ
What is the maximum clamping voltage of SMBJ33 under standard surge conditions?
The SMBJ33 has a maximum clamping voltage (VC) of 59.0 V when subjected to its rated 10.6 A peak impulse current (IPP) using the 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees the protected circuit sees no more than 59.0 V during such transients. The SMBJ33 maintains this clamping performance across its full operating temperature range.
Is SMBJ33 unidirectional or bidirectional, and how is polarity identified?
SMBJ33 is a unidirectional TVS diode. Polarity is indicated by a cathode band printed on the device body-this band marks the cathode terminal, which connects to the line being protected (e.g., 33 V rail), while the anode connects to ground. Bidirectional variants use "C" or "CA" suffixes (e.g., SMBJ33C); the SMBJ33 does not have this suffix and is strictly unidirectional.
Does SMBJ33 meet automotive transient immunity standards?
Yes, SMBJ33 meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (inductive switch-off), Pulse 3a (capacitive coupled noise), and Pulse 3b (supply line spikes). This makes it suitable for protecting ECUs, body control modules, and infotainment systems against real-world automotive electrical disturbances.
What is the leakage current specification for SMBJ33 at its working voltage?
At its 33 V working stand-off voltage (VWM), the SMBJ33 exhibits a maximum blocking leakage current (ID) of 1 µA at 25 °C. This ultra-low leakage ensures minimal impact on standby power consumption in battery-backed or energy-sensitive systems. Leakage remains well below 1 µA up to 33 V and rises only slightly beyond that threshold.
Can SMBJ33 be used in automated SMT assembly without special handling?
Yes, SMBJ33 is rated J-STD-020 Level 1 for moisture sensitivity-meaning it can be stored indefinitely at ≤30 °C/85 % RH and processed through standard reflow profiles without baking or dry-pack requirements. Its matte tin-plated leads also comply with J-STD-002 for solderability, supporting high-yield automated placement and reflow in volume manufacturing.
SMBJ33 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ33 FAQ
1.How can I place an order for SMBJ33 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ33 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 SMBJ33 reliable?
The price and inventory of SMBJ33 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ33 is usually 5 days.
3.What payment methods are accepted for SMBJ33?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ33 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ33?
SMBJ33 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ33 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 SMBJ33?
For technical support, including SMBJ33 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ33 requirements.
6.How does Aetrix verify that SMBJ33 is sourced from the original manufacturer or authorized distributors?
All SMBJ33 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 SMBJ33 meets industry standards.
7.What is the process for return or replacement of SMBJ33?
All SMBJ33 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ33, 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 SMBJ33 part is unused and in its original packaging.
Return procedure for SMBJ33:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ33 Tags
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