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Vishay General Semiconductor - Diodes Division SMBJ3V3-E3/5B
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- Part No.:
- SMBJ3V3-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ3V3-E3/5B.pdf
- Description:
- TVS DIODE 3.3VWM 10.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:21,738
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Product details
Overview
SMBJ3V3-E3/5B from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for primary overvoltage protection of 3.3 V supply rails. It features a 3.3 V stand-off 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 with matte tin-plated leads - used to safeguard ICs, MOSFETs, and sensor signal lines against inductive switching transients and ESD.
For engineers reviewing the SMBJ3V3-E3/5B datasheet, SMBJ3V3-E3/5B pinout, SMBJ3V3-E3/5B application, or SMBJ3V3-E3/5B equivalent, key selection criteria include clamping performance at 50 A, thermal resistance (RθJA = 100 °C/W), junction capacitance (5200 pF at 0 V), AEC-Q101 qualification eligibility (via HE3/HM3 variants), and compatibility with automated SMT assembly per J-STD-002.
Technical Context
This TVS diode operates as a unidirectional shunt clamp, conducting only during reverse overvoltage events above its breakdown threshold. Its low clamping ratio (VC/VBR ≈ 1.78) and fast response time ensure effective suppression of transient energy before downstream components experience stress.
Designed for PCB-level protection, it relies on 0.2" × 0.2" copper pads per terminal for thermal management and meets MSL Level 1 reflow requirements (peak 260 °C). The device's 175 °C maximum junction temperature and -65 °C to +175 °C operating range support deployment in automotive under-hood and industrial control environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 3.3 V - Maximum continuous reverse working voltage; defines safe operating ceiling for 3.3 V rail protection without leakage-induced power loss. |
| VBR (min) | 4.1 V - Minimum breakdown voltage at 1 mA test current; ensures reliable triggering above nominal supply. |
| VC @ IPP = 50 A | 7.3 V - Clamped voltage under 10/1000 μs surge; limits stress on protected 3.3 V logic devices to <2.2× supply. |
| PPPM | 600 W - Peak pulse power handling (10/1000 μs); supports robust immunity to IEC 61000-4-5 Level 3 surges. |
| CJ @ 0 V | 5200 pF - Junction capacitance at zero bias; impacts high-frequency signal integrity on data lines (e.g., UART, I²C). |
| RθJA | 100 °C/W - Thermal resistance junction-to-ambient on recommended PCB layout; informs derating for sustained power dissipation. |
| TJ max | 175 °C - Maximum junction temperature; enables operation in under-hood automotive or high-ambient industrial settings. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, cathode indicated by color band. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H), with 5.0 mm × 5.0 mm copper pad recommendation per terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line (e.g., 3.3 V rail or signal trace); conducts surge current to ground when V > VBR. |
| Anode | Reference node | Typically tied to system ground; completes shunt path during clamping event and defines polarity orientation. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional clamping | Enables precise protection of DC-biased lines (e.g., 3.3 V supply) without forward conduction during normal operation. |
| 600 W peak pulse power | Withstands repetitive 10/1000 μs transients up to 50 A, meeting IEC 61000-4-5 surge immunity requirements. |
| MSL Level 1 rating | Supports single-reflow assembly at 260 °C peak without popcorn or delamination risk. |
| AEC-Q101 qualification path | HE3/HM3 variants are automotive-qualified; SMBJ3V3-E3/5B shares identical die and construction for drop-in qualification readiness. |
| RoHS-compliant, halogen-free option | E3 suffix denotes RoHS compliance; M3 suffix adds halogen-free molding compound for stringent environmental compliance. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in factory automation systems exposed to relay coil flyback. IC Role / Device Role / Timing Role: Shunt TVS placed between sensor output and ground to clamp induced spikes before reaching ADC input. Use Value: Prevents ADC saturation or latch-up caused by >100 V transients while maintaining <1 μA leakage at 3.3 V. | Use Scenario: Safeguarding LIN bus transceiver power pins in door module ECUs subject to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 3.3 V LDO output feeding microcontroller peripherals. Use Value: Limits clamped voltage to 7.3 V during 50 A surge, keeping downstream logic within absolute maximum ratings. |
| IoT Edge Node Power Rail | Medical Diagnostic Equipment |
Use Scenario: Securing 3.3 V supply to Wi-Fi/BLE SoCs in battery-powered gateways connected to noisy AC mains-powered peripherals. IC Role / Device Role / Timing Role: Standoff-rated TVS on main PMIC output, coordinated with upstream fuse and downstream ceramic decoupling. Use Value: Provides sub-10 ns response to fast ESD events (IEC 61000-4-2 ±8 kV contact) without degrading RF performance via excessive capacitance. | Use Scenario: Shielding isolated SPI communication lines between FPGA and analog front-end ASIC in portable ultrasound units. IC Role / Device Role / Timing Role: Low-capacitance TVS on bidirectional digital lines, leveraging 5200 pF value optimized for <10 MHz signal bandwidth. Use Value: Enables ESD protection without distorting pulse timing or introducing jitter in time-critical echo sampling paths. |
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-M3/5B | Identical electrical specs; uses halogen-free molding compound per IEC 61249-2-21. | No functional difference; selected where halogen-free compliance is mandated (e.g., EU medical devices). | Direct material substitute when RoHS + halogen-free certification is required; same footprint and assembly process. |
| SAC3V3-01ET1G | Lower PPPM (300 W), lower VC (6.5 V @ 25 A), smaller SOD-323 package (1.7 mm × 1.3 mm), higher RθJA (~200 °C/W). | Better suited for space-constrained, low-energy transients (e.g., USB data lines); not rated for 50 A surges. | Choose for compact layouts with <25 A threat levels; avoid for industrial 10/1000 μs surge protection requiring 600 W rating. |
Compared with SMBJ3V3-M3/5B, SMBJ3V3-E3/5B offers identical protection performance with standard RoHS compliance; versus SAC3V3-01ET1G, it delivers double pulse power and higher surge current capacity at the cost of larger footprint and capacitance - making it preferable for robust 3.3 V rail protection where board area permits.
Availability
SMBJ3V3-E3/5B is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, and IoT edge node power rails requiring stable component supply, long-term manufacturability, and consistent surge immunity performance across production batches.
Supply support for SMBJ3V3-E3/5B 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, power efficiency, and automotive-grade qualification.
The SMBJ series is engineered for high-energy transient suppression in harsh environments, targeting design-in across automotive, industrial, and communications infrastructure where repeatable clamping and thermal stability are critical.
FAQ
What is the maximum clamping voltage of SMBJ3V3-E3/5B under a 10/1000 μs surge?
The SMBJ3V3-E3/5B clamps to a maximum of 7.3 V when subjected to a 50 A peak pulse with a 10/1000 μs waveform, as specified in the Vishay datasheet (Document Number: 88940). This value ensures protected 3.3 V logic circuits remain below their absolute maximum voltage rating during standardized surge events. The clamping behavior is validated at TJ = 25 °C with proper PCB thermal pads.
Is SMBJ3V3-E3/5B qualified for automotive applications?
SMBJ3V3-E3/5B itself is commercial-grade, but Vishay offers AEC-Q101-qualified versions under the HE3 and HM3 suffixes (e.g., SMBJ3V3HE3_B/I). The SMBJ3V3-E3/5B shares identical die, package, and electrical characteristics - enabling seamless qualification migration. For production automotive use, specify the HE3 or HM3 variant with appropriate revision code.
What is the junction capacitance of SMBJ3V3-E3/5B and how does it affect signal lines?
The SMBJ3V3-E3/5B exhibits a typical junction capacitance of 5200 pF at 0 V bias and 1 MHz. This value is appropriate for DC power rail protection but may load high-speed digital lines (e.g., USB 2.0 or Ethernet). When protecting signal paths, evaluate whether this capacitance introduces unacceptable rise-time degradation or crosstalk - consider lower-CJ alternatives like the SAC3V3-01ET1G (120 pF) for data lines.
Can SMBJ3V3-E3/5B be used in parallel to increase surge current handling?
No - SMBJ3V3-E3/5B should not be paralleled due to parameter spread (e.g., VBR tolerance ±5 %) causing uneven current sharing and potential thermal runaway. For higher surge capability, select a single higher-rated device such as SMBJ5V0-E3/5B (100 A IPP) or use a TVS array with matched characteristics. Layout symmetry and thermal coupling do not overcome inherent VBR mismatch in discrete diodes.
What is the recommended PCB pad layout for SMBJ3V3-E3/5B to achieve rated thermal performance?
Vishay specifies 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads for each terminal of SMBJ3V3-E3/5B to achieve the rated RθJA of 100 °C/W and sustain 5 W power dissipation at TA = 75 °C. Use internal copper planes and thermal vias beneath pads if ambient temperatures exceed 75 °C. Deviation from this layout increases junction temperature and reduces surge endurance.
SMBJ3V3-E3/5B 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):
- 4.1V
- Voltage - Clamping (Max) @ Ipp:
- 10.3V
- Current - Peak Pulse (10/1000µs):
- 200A (8/20µs)
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 5200pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ3V3-E3/5B FAQ
1.How can I place an order for SMBJ3V3-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ3V3-E3/5B 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-E3/5B reliable?
The price and inventory of SMBJ3V3-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ3V3-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ3V3-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ3V3-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ3V3-E3/5B?
SMBJ3V3-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ3V3-E3/5B 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-E3/5B?
For technical support, including SMBJ3V3-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ3V3-E3/5B requirements.
6.How does Aetrix verify that SMBJ3V3-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ3V3-E3/5B 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-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ3V3-E3/5B?
All SMBJ3V3-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ3V3-E3/5B, 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-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ3V3-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ3V3-E3/5B Tags
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