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Vishay General Semiconductor - Diodes Division SMBJ3V3-M3/5B
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- Part No.:
- SMBJ3V3-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ3V3-M3/5B.pdf
- Description:
- TVS DIODE 3.3VWM DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:13,157
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Product details
Overview
SMBJ3V3-M3/5B from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection of 3.3 V supply rails and signal lines. It features a 3.3 V standoff voltage (VWM), 4.1 V minimum breakdown voltage (VBR), 7.3 V clamping voltage at 50 A (10/1000 μs), 600 W peak pulse power, and SMB (DO-214AA) package - used to safeguard ICs, MOSFETs, and sensor interfaces against ESD, inductive switching transients, and lightning surges.
For engineers reviewing the SMBJ3V3-M3/5B datasheet, SMBJ3V3-M3/5B pinout, SMBJ3V3-M3/5B application, or SMBJ3V3-M3/5B equivalent, key selection criteria include clamping performance at 50 A, thermal resistance (RθJA = 100 °C/W), junction temperature range (–65 °C to +175 °C), halogen-free RoHS compliance, and compatibility with automated SMT assembly per J-STD-002.
Technical Context
This TVS diode operates as a unidirectional clamping device, conducting only during positive transients relative to its cathode-marked terminal. Its silicon avalanche structure delivers sub-nanosecond response time and stable clamping across temperature, with a –5.3 × 10⁻⁴ /°C VBR temperature coefficient ensuring predictable behavior from –65 °C to +175 °C junction operation.
Designed for PCB-level surge immunity, it relies on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 600 W (10/1000 μs) pulse handling and 200 A peak current (8/20 μs). Its MSL Level 1 rating and 260 °C lead-free reflow compatibility support high-reliability commercial and automotive-grade production.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 3.3 V - Maximum continuous reverse operating voltage before conduction; matches 3.3 V logic/supply rail tolerance. |
| VBR (min) | 4.1 V at 1 mA - Ensures reliable turn-on above normal operating voltage but below IC absolute maximum ratings. |
| VC @ IPP = 50 A | 7.3 V (10/1000 μs) - Clamped voltage seen by protected circuit during standard surge event; limits stress on downstream 3.3 V devices. |
| PPPM | 600 W - Peak transient energy absorption capability under standardized 10/1000 μs waveform. |
| RθJA | 100 °C/W - Thermal resistance from junction to ambient on recommended PCB layout; determines power derating above 75 °C. |
| CJ @ 0 V | 5200 pF - Junction capacitance at zero bias; impacts high-frequency signal integrity on data lines. |
| TJ max | +175 °C - Maximum junction temperature; enables use in under-hood or industrial environments with elevated ambient. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, molded plastic case with matte tin-plated leads. Cathode identified by a color band on the body end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line (e.g., I/O or supply); conducts surge current to ground when voltage exceeds VBR. |
| Anode | Reference/return path | Typically tied to system ground or low-impedance return plane; completes clamping path during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| Halogen-free, RoHS-compliant construction | M3 suffix confirms full halogen-free material set and compliance with EU RoHS Directive 2011/65/EU and JEDEC JS709. |
| MSL Level 1 moisture sensitivity | Rated for unlimited floor life at ≤30 °C/85 % RH; supports standard SMT reflow without baking. |
| Low clamping ratio (VC/VBR ≈ 1.78) | Delivers tight voltage limiting - critical for protecting modern 3.3 V CMOS ICs with narrow absolute maximum input ranges. |
| High surge current capability | Withstands 200 A (8/20 μs) and 50 A (10/1000 μs), meeting IEC 61000-4-5 Level 4 requirements when properly laid out. |
| Automotive-grade variant available | AEC-Q101 qualified versions (HM3 suffix) exist; this M3 part is commercial-grade but shares identical electrical specs and footprint. |
Applications
| Industrial Sensor Interface Protection | 3.3 V Microcontroller I/O Line Protection |
|---|---|
Use Scenario: Protecting analog/digital sensor outputs (e.g., temperature, pressure) connected to PLC or DAQ inputs exposed to motor drive noise and relay switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between sensor output and MCU input pin. Use Value: Limits induced transients to ≤7.3 V, preventing latch-up or gate oxide damage in 3.3 V input buffers while maintaining signal fidelity via 5200 pF capacitance. | Use Scenario: Shielding GPIO, UART, or SPI lines of ARM Cortex-M microcontrollers in factory automation controllers from ESD and cable discharge events. IC Role / Device Role / Timing Role: Localized transient suppressor mounted directly at connector or IC pad to minimize inductance in clamping path. Use Value: Achieves <1 ns response and clamps 8 kV contact ESD (IEC 61000-4-2) within safe voltage margin, preserving signal integrity and system uptime. |
| DC Power Rail Protection (3.3 V) | Automotive Body Control Module Input Protection |
Use Scenario: Safeguarding 3.3 V LDO outputs feeding FPGA configuration memory or RF transceiver bias supplies against load dump coupling and hot-swap surges. IC Role / Device Role / Timing Role: Parallel-connected TVS across power rail and ground, sized for 600 W peak dissipation. Use Value: Absorbs up to 600 W transient energy without failure, enabling reliable operation in noisy industrial power systems with minimal board space. | Use Scenario: Protecting LIN bus or discrete switch inputs in BCMs from battery reversal, jump-start spikes, and ISO 7637-2 pulse 1/2a/3a transients. IC Role / Device Role / Timing Role: Front-end suppression element on external-facing pins, leveraging SMB footprint for high-density routing. Use Value: Withstands 175 °C junction temperature and meets automotive thermal cycling requirements; M3 halogen-free materials support vehicle OEM environmental mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ3V3-E3/5B | Same electrical specs and SMB package; RoHS-compliant but not halogen-free (E3 vs. M3). | No difference in protection performance; differs only in material composition and regulatory reporting scope. | Select E3 if halogen-free certification is not required; M3 preferred for strict environmental compliance programs. |
| SAC3V3-03 | Lower 300 W PPPM rating, 6.5 V VC @ 25 A, smaller SOD-323 package (0.085" × 0.055"), higher RθJA (~200 °C/W). | Not suitable for high-energy surges; limited to low-power signal lines where board space is critical and surge threat level is moderate. | Choose SAC3V3-03 only for compact, low-capacitance (<30 pF) signal protection; SMBJ3V3-M3/5B remains superior for power rail or high-threat environments. |
Compared with SMBJ3V3-E3/5B, the M3 version adds halogen-free assurance without trade-offs in electrical or thermal performance; versus SAC3V3-03, SMBJ3V3-M3/5B provides double the surge power handling, lower clamping voltage at rated current, and better thermal management - making it the robust choice for industrial and automotive-adjacent 3.3 V protection.
Availability
SMBJ3V3-M3/5B is available at Aetrix Electronics and suitable for industrial sensor interfaces, 3.3 V microcontroller I/O protection, and DC power rail surge suppression requiring stable component supply, long-term manufacturability, and halogen-free compliance.
Supply support for SMBJ3V3-M3/5B 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, precision, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in commercial and automotive electronics, targeting robustness against ESD, lightning, and inductive switching events in space-constrained SMT designs.
FAQ
What is the maximum clamping voltage of SMBJ3V3-M3/5B at 50 A?
The SMBJ3V3-M3/5B has a maximum clamping voltage (VC) of 7.3 V when subjected to a 50 A peak pulse current with a 10/1000 μs waveform. This value is measured per the test conditions specified in the Vishay datasheet (Document Number: 88940) and ensures protected circuits remain within safe operating limits during standardized surge events. The SMBJ3V3-M3/5B maintains this clamping performance across its full operating temperature range.
Is SMBJ3V3-M3/5B suitable for automotive applications?
The SMBJ3V3-M3/5B is a commercial-grade halogen-free TVS diode and is not AEC-Q101 qualified. However, Vishay offers the functionally identical SMBJ3V3-HM3/5B variant with AEC-Q101 qualification for automotive use. For non-safety-critical body electronics or industrial systems with automotive-like environments, SMBJ3V3-M3/5B may be deployed with appropriate system-level validation - but SMBJ3V3-M3/5B itself carries no automotive qualification.
What does the "M3" suffix mean in SMBJ3V3-M3/5B?
The "M3" suffix in SMBJ3V3-M3/5B indicates halogen-free, RoHS-compliant construction per JEDEC JS709 and EU Directive 2011/65/EU. It denotes matte tin-plated leads, JESD201 Class 2 whisker resistance, and molding compound free of brominated flame retardants and chlorine-based additives. This distinguishes it from the "E3" suffix, which is RoHS-compliant but not halogen-free.
Can SMBJ3V3-M3/5B be used in place of a bidirectional TVS?
No - SMBJ3V3-M3/5B is strictly unidirectional and must be oriented with its cathode toward the protected line. It does not suppress negative-going transients relative to ground. For bidirectional protection (e.g., AC lines or differential buses), a dedicated bidirectional part like SMBJ3V3CA is required. Using SMBJ3V3-M3/5B in a bidirectional configuration risks catastrophic failure during reverse surges.
What PCB layout guidelines apply to SMBJ3V3-M3/5B for optimal surge performance?
Per Vishay's datasheet, SMBJ3V3-M3/5B requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads on both anode and cathode terminals to achieve rated 600 W pulse power and thermal performance. Trace inductance must be minimized - short, wide traces directly connecting to ground/power planes - and the device should be placed as close as possible to the protected node. The SMBJ3V3-M3/5B mounting pad layout is defined in Figure 4 of Document Number 88940.
SMBJ3V3-M3/5B 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 3.3V
- Voltage - Breakdown (Min):
- -
- Voltage - Clamping (Max) @ Ipp:
- -
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ3V3-M3/5B FAQ
1.How can I place an order for SMBJ3V3-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ3V3-M3/5B 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 SMBJ3V3-M3/5B reliable?
The price and inventory of SMBJ3V3-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ3V3-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ3V3-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ3V3-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ3V3-M3/5B?
SMBJ3V3-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ3V3-M3/5B 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 SMBJ3V3-M3/5B?
For technical support, including SMBJ3V3-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ3V3-M3/5B requirements.
6.How does Aetrix verify that SMBJ3V3-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ3V3-M3/5B 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 SMBJ3V3-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ3V3-M3/5B?
All SMBJ3V3-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ3V3-M3/5B, 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 SMBJ3V3-M3/5B part is unused and in its original packaging.
Return procedure for SMBJ3V3-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ3V3-M3/5B Tags
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