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Taiwan Semiconductor Corporation SMBJ33C
- Part No.:
- SMBJ33C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ33C.pdf
- Description:
- 600W, 40.8V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:2,711
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Product details
Overview
SMBJ33C from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in DC power rails and signal lines. It features a 33 V working stand-off voltage (VWM), 36.7–44.9 V breakdown voltage (VBR), 59.0 V maximum clamping voltage (VC) at 10.6 A peak pulse current, and 600 W peak pulse power rating with DO-214AA (SMB) package - ideal for automotive load-dump and industrial I/O protection.
For engineers reviewing the SMBJ33C datasheet, SMBJ33C pinout, SMBJ33C application, or SMBJ33C equivalent, key selection criteria include bidirectional clamping capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1 ps response time, <1 µA leakage above 10 V, and UL 94V-0 molding compound - all critical for robust EMC design in harsh environments.
Technical Context
The SMBJ33C operates as a silicon avalanche diode with glass-passivated junction, enabling fast, repeatable clamping during transients up to 10/1000 µs waveform. Its bidirectional configuration supports symmetrical voltage suppression without polarity dependency, making it suitable for AC-coupled interfaces and floating bus lines.
Thermal performance is defined by RθJC = 10 °C/W and RθJA = 55 °C/W, supporting continuous operation from –55 °C to +150 °C junction temperature. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity - confirming suitability for lead-free reflow assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before significant leakage begins; defines safe DC rail margin. |
| VBR min / max | 36.7 V / 44.9 V @ 1 mA - Ensures reliable avalanche initiation across process variation and temperature. |
| VC @ IPP | 59.0 V @ 10.6 A - Clamped voltage during 10/1000 µs surge; determines protected circuit's overvoltage stress level. |
| PPK | 600 W - Peak pulse power handling per single transient; validates immunity to ISO 7637-2 Pulse 5a (load dump). |
| ID @ VWM | <1 µA - Ultra-low leakage preserves battery life and avoids false triggering in high-impedance sensing nodes. |
| Response time | <1.0 ps - Enables suppression of nanosecond-scale ESD events (IEC 61000-4-2) before IC damage occurs. |
| Package | DO-214AA (SMB) - Industry-standard SMT footprint with 0.090 g mass; compatible with automated placement and IPC-A-610 Class 3 assembly. |
Pinout & Package
DO-214AA (SMB) package: surface-mount, molded plastic case with cathode band marking for unidirectional variants; SMBJ33C is bidirectional and marked with "ML" code - no polarity orientation required in PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction terminals | No functional distinction between leads; either terminal may connect to line or ground - simplifies routing and eliminates polarity errors. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR and low leakage over lifetime, even under thermal cycling and humidity exposure. |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validates robustness against automotive electrical disturbances including supply transients and coupled noise. |
| UL 94V-0 flammability rating | Molding compound self-extinguishes under flame exposure - required for safety-critical industrial and transportation systems. |
| J-STD-020 Level 1 moisture sensitivity | Enables use without baking prior to reflow; supports just-in-time manufacturing and reduces handling overhead. |
| Halogen-free per IEC 61249-2-21 | Meets RoHS and environmental compliance mandates for green electronics manufacturing and end-of-life recycling. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V CAN/LIN bus power inputs from load dump and jump-start surges in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed between VBAT and GND upstream of DC-DC converter input. Use Value: Limits transient voltage to ≤59.0 V, preventing damage to downstream regulators rated for 40 V absolute max input. |
Use Scenario: Shielding 4–20 mA current-loop transmitters from EFT bursts in factory automation PLC modules. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) bidirectional suppressor across loop terminals to absorb 1 kV/50 Ω EFT pulses. Use Value: Maintains signal integrity during 100 ns–100 ms transients while adding negligible offset error due to ultra-low ID. |
| LED Driver Input Protection | RS-485 Transceiver Bus Line Protection |
Use Scenario: Safeguarding constant-current LED drivers against inductive kickback from relay-controlled loads in streetlight controllers. IC Role / Device Role / Timing Role: Parallel-connected TVS on driver input rail to clamp switching spikes before they reach internal MOSFETs. Use Value: Withstands 600 W single-pulse energy and clamps to 59.0 V, keeping driver IC VDS within SOA limits. |
Use Scenario: Guarding RS-485 differential bus lines (A/B) against lightning-induced surges in building management systems. IC Role / Device Role / Timing Role: Bidirectional TVS pair (one per line) referenced to common-mode ground to suppress common-mode transients. Use Value: Symmetrical clamping ensures equal protection on both A and B lines without skew or imbalance in differential signaling. |
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 (Taiwan Semiconductor) | Same VWM/VBR/VC specs; CA suffix denotes halogen-free + RoHS-compliant variant with identical electrical performance. | No functional difference; selected when explicit halogen-free certification documentation is required for audit. | Direct material substitution where full IEC 61249-2-21 compliance reporting is mandated. |
| SMAJ33C (ON Semiconductor) | Same DO-214AC (SMA) package but lower PPK = 400 W; VC = 53.3 V @ 7.5 A - less robust for ISO 7637-2 Pulse 5a. | Not recommended for automotive load-dump; suitable only for lighter-duty ESD and EFT in consumer-grade interfaces. | Consider only if board space allows SMA footprint and system-level surge testing confirms 400 W sufficiency. |
Compared with SMBJ33C, SMBJ33CA offers identical protection performance with certified halogen-free materials, while SMAJ33C trades 33% lower pulse power for smaller size - requiring careful validation against worst-case surge profiles in final application.
Availability
SMBJ33C is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and LED lighting control systems requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ33C 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 SMBJ series was developed specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing ISO 7637-2 compliance, thermal robustness, and automated assembly compatibility.
FAQ
What is the clamping voltage of SMBJ33C at its rated peak pulse current?
The SMBJ33C has a maximum clamping voltage (VC) of 59.0 V when subjected to its rated peak impulse current (IPP) of 10.6 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuits during surge events - critical for ensuring downstream ICs remain within their absolute maximum ratings.
Is SMBJ33C unidirectional or bidirectional, and how is polarity identified?
SMBJ33C is a bidirectional TVS diode, meaning it provides symmetrical clamping in both forward and reverse directions - no cathode band or polarity marking is functionally required. Unlike unidirectional SMBJ33A, the 'C' suffix explicitly denotes bidirectional configuration, eliminating orientation constraints during PCB layout and assembly.
Does SMBJ33C meet automotive surge immunity standards?
Yes, SMBJ33C meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling), as confirmed in Taiwan Semiconductor's official datasheet revision R2104. Its 600 W peak power rating and 59.0 V clamping voltage make it suitable for 12 V and 24 V automotive power rail protection.
What is the maximum operating temperature range for SMBJ33C?
The SMBJ33C supports a junction temperature range of –55 °C to +150 °C, with thermal resistance values of RθJC = 10 °C/W and RθJA = 55 °C/W. This enables reliable operation in under-hood automotive environments and industrial enclosures where ambient temperatures exceed 85 °C - provided PCB copper area and airflow meet thermal derating guidelines in Figure 2 of the datasheet.
How does SMBJ33C differ from SMBJ33A in terms of electrical behavior?
SMBJ33C is bidirectional with symmetrical VBR (36.7–44.9 V) and VC (59.0 V) in both directions, while SMBJ33A is unidirectional - exhibiting forward conduction (~3.5 V VF) and reverse clamping only. SMBJ33A also has slightly tighter VBR tolerance (36.7–40.6 V) and lower VC (53.3 V), but cannot protect AC or floating signals without external circuitry.
SMBJ33C 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:
- -
- Bidirectional Channels:
- 1
- 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)
SMBJ33C FAQ
1.How can I place an order for SMBJ33C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ33C 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 SMBJ33C reliable?
The price and inventory of SMBJ33C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ33C is usually 5 days.
3.What payment methods are accepted for SMBJ33C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ33C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ33C?
SMBJ33C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ33C 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 SMBJ33C?
For technical support, including SMBJ33C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ33C requirements.
6.How does Aetrix verify that SMBJ33C is sourced from the original manufacturer or authorized distributors?
All SMBJ33C 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 SMBJ33C meets industry standards.
7.What is the process for return or replacement of SMBJ33C?
All SMBJ33C units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ33C, 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 SMBJ33C part is unused and in its original packaging.
Return procedure for SMBJ33C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ33C Tags
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