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Vishay General Semiconductor - Diodes Division SMBG33CA-M3/5B
- Part No.:
- SMBG33CA-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG33CA-M3/5B.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO215AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMBG33CA-M3/5B from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMBG (DO-215AA) package, designed for robust overvoltage protection of signal and power lines. It features a 33 V stand-off voltage (VWM), 36.7–40.6 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 μs), clamping voltage of 53.3 V at 11.3 A IPPM, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the SMBG33CA-M3/5B datasheet, SMBG33CA-M3/5B pinout, SMBG33CA-M3/5B application, or SMBG33CA-M3/5B equivalent, this device serves as a halogen-free, RoHS-compliant, surface-mount TVS for high-reliability transient suppression in automotive sensor interfaces, industrial I/O ports, and telecom line protection where bidirectional surge immunity and low clamping ratio are critical.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR min/max (36.7 V / 40.6 V) and VC (53.3 V) specifications in either direction. Its glass-passivated junction ensures stable avalanche characteristics and fast response time (<1 ns), while the low incremental surge resistance supports effective energy diversion during ESD and lightning-induced transients.
The device is rated for TJ = –55 °C to +150 °C, meets MSL Level 1 per J-STD-020 (260 °C peak reflow), and delivers 600 W peak pulse power under standardized 10/1000 μs waveform with 0.01% duty cycle - validated on 5.0 mm × 5.0 mm copper pads per terminal.
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 / 40.6 V at IT = 1 mA - guaranteed avalanche onset range for reliable bidirectional triggering |
| VC @ IPPM | 53.3 V at 11.3 A - clamped voltage during full 600 W surge, defining protected circuit's max stress level |
| PPPM | 600 W - peak transient power handling capability with 10/1000 μs waveform |
| ID @ VWM | 1.0 μA - ultra-low leakage current ensuring minimal standby power loss and signal integrity |
| TJ max | +150 °C - extended junction temperature rating enabling use in under-hood automotive and high-ambient industrial environments |
| AEC-Q101 | Qualified - certified for automotive electronics per stress test standard, including HTOL, TCT, and ESD HBM/MM |
Pinout & Package
Package: SMBG (DO-215AA), surface-mount, gull-wing leaded, halogen-free, RoHS-compliant, matte tin-plated terminals solderable per J-STD-002 and JESD 22-B102. No polarity marking - bidirectional symmetry eliminates cathode/anode orientation concerns during placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Common connection point; functions identically as anode in one polarity and cathode in reverse - no DC bias dependency |
| Terminal 2 | Anode/Cathode (bidirectional) | Paired terminal completing symmetrical conduction path; enables clamping of positive and negative transients without external circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., CAN, RS-485, USB D+/D−) without polarity constraints |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) when mounted per recommended pad layout |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, body control, and ADAS modules requiring long-term reliability under thermal cycling and vibration |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes voltage overshoot during transients, reducing risk of downstream IC latch-up or gate oxide damage in MOSFET drivers |
| MSL Level 1 rating | Supports standard SMT reflow profiles up to 260 °C peak without preconditioning, simplifying manufacturing integration |
Applications
| Automotive Sensor Protection | Industrial RS-485 Interface |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine control units exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional TVS placed between sensor output and microcontroller ADC input to clamp ±300 V transients within <1 ns. Use Value: Prevents ADC saturation and microcontroller reset by limiting voltage to ≤53.3 V while maintaining sub-μA leakage at 33 V nominal rail. | Use Scenario: Shielding differential RS-485 transceivers in factory automation PLCs from EFT bursts and surge coupling via long cable runs. IC Role / Device Role / Timing Role: Placed across A/B bus lines to suppress common-mode transients up to 600 W without distorting signal integrity at 10 Mbps. Use Value: Maintains data reliability under IEC 61000-4-4 (4 kV EFT) and IEC 61000-4-5 (2 kV surge) due to symmetrical clamping and low capacitance (~100 pF). |
| Telecom Line Card Protection | Consumer USB Port ESD Suppression |
Use Scenario: Safeguarding Ethernet PHY interface pins on telecom line cards against lightning-induced surges entering via RJ-45 jacks. IC Role / Device Role / Timing Role: Installed on each twisted pair (e.g., TX+/TX−, RX+/RX−) to provide coordinated differential-mode transient suppression. Use Value: Limits induced voltage to <53.3 V during 10/1000 μs surges, preventing PHY latch-up and enabling compliance with GR-1089-CORE requirements. | Use Scenario: Adding secondary-level ESD protection on USB 2.0 D+ and D− lines behind primary TVS arrays in portable media players. IC Role / Device Role / Timing Role: Acts as low-capacitance (≈100 pF), bidirectional clamp to absorb ±15 kV contact discharge per IEC 61000-4-2. Use Value: Reduces ESD-induced bit errors by clamping transients below USB receiver threshold (±6 V) while adding <0.5 pF parasitic capacitance per line. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBG33CA-E3/5B | Same electrical specs and SMBG package; RoHS-compliant but not halogen-free (contains brominated flame retardants) | Acceptable for industrial/commercial designs where halogen-free mandate does not apply | Select SMBG33CA-E3/5B if halogen-free certification is not required and cost optimization is prioritized |
| SMAJ33CA | Lower PPPM (400 W), larger SMA (DO-214AC) package, higher RθJA (150 °C/W), same VWM/VBR/VC specs | Suitable for lower-energy transients or space-tolerant layouts; not AEC-Q101 qualified | Choose SMAJ33CA only for non-automotive applications with relaxed surge margin and PCB real estate availability |
Compared with SMBG33CA-M3/5B, SMBG33CA-E3/5B offers identical protection performance with reduced environmental compliance, while SMAJ33CA trades 33% lower surge capacity and no automotive qualification for broader legacy design compatibility and lower unit cost.
Availability
SMBG33CA-M3/5B is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial RS-485 networks, telecom line cards, and consumer USB port protection requiring stable component supply and halogen-free compliance.
Supply support for SMBG33CA-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, TVS devices, and optoelectronics with emphasis on high-reliability, high-efficiency solutions.
The SMBG series was engineered for surface-mount transient suppression in space-constrained, high-surge environments - particularly targeting automotive, industrial, and telecom systems demanding AEC-Q101 validation and robust 600 W pulse handling.
FAQ
What does the "CA" suffix indicate in SMBG33CA-M3/5B?
The "CA" suffix denotes a bidirectional configuration - meaning SMBG33CA-M3/5B provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., SMBG33A), it has no polarity marking and functions identically regardless of applied voltage polarity, making it ideal for AC-coupled or floating signal paths such as RS-485 or CAN bus lines.
Is SMBG33CA-M3/5B suitable for automotive applications?
Yes, SMBG33CA-M3/5B is AEC-Q101 qualified and rated for operation from –55 °C to +150 °C, confirming its suitability for automotive under-hood and cabin applications. Its halogen-free construction (M3 suffix), MSL Level 1 reflow compatibility, and 600 W surge capability align with requirements for engine control units, ADAS camera modules, and body electronics where transient immunity and long-term reliability are mandatory.
What is the clamping voltage of SMBG33CA-M3/5B and why does it matter?
The clamping voltage (VC) of SMBG33CA-M3/5B is 53.3 V at 11.3 A peak pulse current (IPPM). This value defines the maximum voltage imposed on protected circuitry during a 600 W transient event. A lower VC relative to VBR (clamping ratio ≈ 1.39) minimizes stress on downstream components like microcontrollers or transceivers, directly improving system-level surge survivability and reducing need for additional buffering stages.
How does the SMBG (DO-215AA) package compare to SMA (DO-214AC) in thermal performance?
SMBG (DO-215AA) offers lower thermal resistance than SMA (DO-214AC): RθJL = 20 °C/W vs. ~30–35 °C/W for SMA, and RθJA = 100 °C/W (on 5 mm × 5 mm pads) vs. ~150 °C/W for SMA. This allows SMBG33CA-M3/5B to sustain higher repetitive surge duty cycles and operate reliably at elevated ambient temperatures - a key advantage in densely packed automotive ECUs and industrial controllers.
Can SMBG33CA-M3/5B replace SMBG33A-M3/5B in an existing design?
No - SMBG33CA-M3/5B is bidirectional while SMBG33A-M3/5B is unidirectional, with different polarity marking (cathode band) and forward conduction behavior. Substituting them requires verifying that the protected circuit does not rely on DC blocking or forward rectification. If the application involves AC signals or floating lines (e.g., differential buses), SMBG33CA-M3/5B is appropriate; for DC-biased lines, SMBG33A-M3/5B remains necessary. Always validate layout and clamping behavior in-system.
SMBG33CA-M3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-215AA, SMB Gull Wing
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBG)
SMBG33CA-M3/5B FAQ
1.How can I place an order for SMBG33CA-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG33CA-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 SMBG33CA-M3/5B reliable?
The price and inventory of SMBG33CA-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 SMBG33CA-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBG33CA-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG33CA-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG33CA-M3/5B?
SMBG33CA-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG33CA-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 SMBG33CA-M3/5B?
For technical support, including SMBG33CA-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG33CA-M3/5B requirements.
6.How does Aetrix verify that SMBG33CA-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBG33CA-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 SMBG33CA-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBG33CA-M3/5B?
All SMBG33CA-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBG33CA-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 SMBG33CA-M3/5B part is unused and in its original packaging.
Return procedure for SMBG33CA-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG33CA-M3/5B Tags
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