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Vishay General Semiconductor - Diodes Division SMBJ33CAHM3_B/I
- Part No.:
- SMBJ33CAHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ33CAHM3_B/I.pdf
- Description:
- 600W,33V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:4,108
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Product details
Overview
SMBJ33CAHM3_B/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal and power lines. It features a 33 V standoff voltage (VWM), 36.7–40.6 V breakdown range (VBR) at 1 mA, 600 W peak pulse power (10/1000 µs), and clamps to ≤53.3 V at 11.3 A peak surge current - deployed in industrial sensor interfaces and telecom line protection.
For engineers reviewing the SMBJ33CAHM3_B/I datasheet, SMBJ33CAHM3_B/I pinout, SMBJ33CAHM3_B/I application, or SMBJ33CAHM3_B/I equivalent, this device serves as a halogen-free, RoHS-compliant, AEC-Q101 qualified TVS for bidirectional overvoltage protection where low clamping voltage, fast response (<1 ns), and MSL Level 1 reflow compatibility are critical.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR min/max, ID leakage, and VC clamping behavior in either direction. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance under repetitive transient stress.
The device is rated for 150 °C maximum junction temperature and exhibits a +0.100 %/°C temperature coefficient of VBR - enabling predictable voltage-clamping performance across automotive and industrial ambient ranges. Thermal resistance is 100 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 33 V - Maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 36.7–40.6 V at 1 mA - Ensures reliable turn-on during transients while avoiding false triggering during normal operation. |
| VC (Clamping Voltage) | ≤53.3 V at IPPM = 11.3 A (10/1000 µs) - Limits downstream IC voltage stress to safe levels during ESD or lightning-induced surges. |
| PPPM (Peak Pulse Power) | 600 W - Sustains high-energy transients without failure; validated per IEC 61000-4-5 waveform standards. |
| ID (Max Reverse Leakage) | 1.0 µA at VWM - Minimizes standby power loss and avoids signal integrity degradation in high-impedance circuits. |
| TJ max | 150 °C - Supports operation in under-hood automotive and industrial environments without derating at full power. |
| Package | SMB (DO-214AA) - Surface-mount footprint compatible with automated assembly; meets UL 94 V-0 flammability rating. |
Pinout & Package
Two-terminal bidirectional device in SMB (DO-214AA) package; no polarity marking. Cathode/anode designation does not apply - terminals are functionally symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode / Cathode (bidirectional) | Either terminal accepts transient energy from either polarity; no DC bias dependency. |
| Terminal 2 | Anode / Cathode (bidirectional) | Completes symmetrical clamping path; enables placement without orientation constraints on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns. |
| 600 W peak pulse power (10/1000 µs) | Withstands high-energy surges common in industrial motor drives and telecom line interfaces. |
| Halogen-free, RoHS-compliant HM3 suffix | Meets environmental compliance requirements for global OEM production and end-of-life recycling. |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance testing. |
| MSL Level 1 (260 °C peak) | Supports lead-free reflow soldering without moisture-related popcorning or delamination risks. |
Applications
| Industrial Sensor Interface Protection | Automotive CAN Bus Line Protection |
|---|---|
|
Use Scenario: Protecting analog output lines (e.g., 4–20 mA current loops) in factory automation sensors exposed to relay switching noise and EFT bursts. IC Role / Device Role: Bidirectional voltage clamp placed across signal and return lines to shunt transients before reaching precision ADC or op-amp inputs. Use Value: Clamps induced spikes to ≤53.3 V while maintaining <1.0 µA leakage at 33 V - preserving measurement accuracy and long-term stability. |
Use Scenario: Safeguarding CAN_H/CAN_L differential pair in automotive body control modules against load dump and ISO 7637-2 pulses. IC Role / Device Role: TVS pair (one per line) referenced to ground, leveraging symmetric breakdown to suppress ± transients without DC bias shift. Use Value: Withstands 600 W surges while holding clamping voltage below 53.3 V - ensuring CAN transceiver survival under severe vehicle electrical disturbances. |
| Telecom DSL Line Protection | Power Supply Input Surge Suppression |
|
Use Scenario: Shielding ADSL/VDSL line drivers from lightning-induced surges on twisted-pair telephone lines. IC Role / Device Role: Bidirectional TVS mounted between tip/ring and ground, absorbing common-mode transients before front-end transformer or line driver IC. Use Value: Fast sub-nanosecond response and low clamping voltage prevent saturation or latch-up in sensitive line interface ICs during 10/1000 µs surges. |
Use Scenario: Secondary-side transient suppression on 24 V DC input rails feeding PLC I/O modules or embedded controllers. IC Role / Device Role: Parallel-connected TVS across input capacitor to clamp residual surges escaping primary-stage MOV or fuse-based protection. Use Value: 33 V VWM provides margin above nominal 24 V rail while 53.3 V VC limits stress on downstream DC/DC converters and microcontrollers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CAHE3_B/I | RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification; same VWM/VBR/VC specs. | Suitable for commercial-grade industrial equipment where halogen-free or automotive qualification is not required. | Select when cost sensitivity outweighs halogen-free or automotive reliability requirements. |
| SMAJ33CAHM3 | Lower PPPM (400 W vs. 600 W); same SMB package; VWM/VBR/VC nearly identical but higher clamping at rated IPPM. | Acceptable for lower-energy transient environments (e.g., consumer electronics), but insufficient for IEC 61000-4-5 Level 4. | Choose only if system-level surge testing confirms 400 W capability is sufficient and board space allows SMA footprint. |
Compared with SMBJ33CAHE3_B/I and SMAJ33CAHM3, SMBJ33CAHM3_B/I uniquely combines halogen-free construction, AEC-Q101 qualification, and 600 W surge capacity - making it the preferred choice for automotive and high-reliability industrial designs requiring full compliance and robustness.
Availability
SMBJ33CAHM3_B/I is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive CAN bus protection, telecom DSL line hardening, and 24 V DC power supply surge suppression requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ33CAHM3_B/I 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series delivers high-power transient suppression in compact surface-mount packages, engineered for automotive, industrial, and telecom systems demanding AEC-Q101 validation and robust surge immunity.
FAQ
What is the clamping voltage of SMBJ33CAHM3_B/I at its rated peak pulse current?
The SMBJ33CAHM3_B/I clamps to a maximum of 53.3 V when subjected to its rated peak pulse current of 11.3 A under the standard 10/1000 µs waveform. This value is measured at the device terminals and reflects worst-case voltage seen by protected circuitry during surge events - a key parameter for ensuring downstream ICs remain within absolute maximum ratings.
Is SMBJ33CAHM3_B/I suitable for automotive applications?
Yes, SMBJ33CAHM3_B/I is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction. It is explicitly rated for automotive use per Vishay's ordering nomenclature and has undergone stress testing including temperature cycling, high-temperature reverse bias, and surge endurance - making SMBJ33CAHM3_B/I appropriate for body electronics, infotainment, and powertrain subsystems.
How does the bidirectional configuration of SMBJ33CAHM3_B/I affect its circuit placement?
The bidirectional nature of SMBJ33CAHM3_B/I eliminates polarity constraints: either terminal may connect to signal or ground without functional impact. This simplifies PCB layout, reduces assembly errors, and enables use in AC-coupled or floating differential lines such as CAN, RS-485, or telecom tip/ring - unlike unidirectional variants that require cathode alignment.
What is the maximum steady-state power dissipation of SMBJ33CAHM3_B/I?
SMBJ33CAHM3_B/I has a maximum steady-state power dissipation (PD) of 5.0 W at TA = 50 °C on an infinite heatsink. In typical PCB mounting (0.2" × 0.2" copper pads per terminal), derating applies above 25 °C ambient - with thermal resistance RθJA = 100 °C/W - meaning SMBJ33CAHM3_B/I is intended for transient, not continuous, power handling.
Does SMBJ33CAHM3_B/I meet any industry surge immunity standards?
SMBJ33CAHM3_B/I is rated for 600 W peak pulse power with a 10/1000 µs waveform - matching the test condition defined in IEC 61000-4-5 for surge immunity. While the device itself is not "certified" to the standard, its validated clamping performance and energy handling make SMBJ33CAHM3_B/I a standard solution for achieving Level 3–4 compliance in industrial and automotive equipment designs.
SMBJ33CAHM3_B/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- 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:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 11.3A
- Power - Peak Pulse:
- 600W
- 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-214AA (SMB)
SMBJ33CAHM3_B/I FAQ
1.How can I place an order for SMBJ33CAHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ33CAHM3_B/I 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 SMBJ33CAHM3_B/I reliable?
The price and inventory of SMBJ33CAHM3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ33CAHM3_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ33CAHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ33CAHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ33CAHM3_B/I?
SMBJ33CAHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ33CAHM3_B/I 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 SMBJ33CAHM3_B/I?
For technical support, including SMBJ33CAHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ33CAHM3_B/I requirements.
6.How does Aetrix verify that SMBJ33CAHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ33CAHM3_B/I 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 SMBJ33CAHM3_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ33CAHM3_B/I?
All SMBJ33CAHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ33CAHM3_B/I, 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 SMBJ33CAHM3_B/I part is unused and in its original packaging.
Return procedure for SMBJ33CAHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ33CAHM3_B/I Tags
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Diodes Incorporated
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