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Vishay General Semiconductor - Diodes Division SMBG45A-M3/5B
- Part No.:
- SMBG45A-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG45A-M3/5B.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,670
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Product details
Overview
SMBG45A-M3/5B from Vishay General Semiconductor is a unidirectional surface-mount TransZORB® transient voltage suppressor (TVS) diode in SMBG (DO-215AA) package, designed for clamping fast-rising voltage transients on power and signal lines. It features 45 V stand-off voltage (VWM), 50.0–55.3 V breakdown voltage (VBR) at 1 mA, 72.7 V maximum clamping voltage (VC) at 8.3 A peak pulse current, and 600 W peak pulse power rating with 10/1000 μs waveform.
For engineers reviewing the SMBG45A-M3/5B datasheet, SMBG45A-M3/5B pinout, SMBG45A-M3/5B application, or SMBG45A-M3/5B equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, halogen-free RoHS compliance (M3 suffix), 150 °C max junction temperature, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamping protection device, conducting only when reverse voltage exceeds its breakdown threshold to shunt surge energy away from sensitive downstream circuitry. Its glass-passivated junction ensures stable leakage performance and robust surge handling under repetitive 0.01% duty cycle conditions.
Designed for industrial and automotive environments, SMBG45A-M3/5B meets MSL Level 1 per J-STD-020, supports 260 °C lead-free reflow, and delivers low incremental surge resistance for effective suppression of inductive switching spikes and ESD events up to ±30 kV contact discharge (IEC 61000-4-2 compliant per family specification).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected line. |
| VBR (min/max) | 50.0 V / 55.3 V at 1 mA - Confirmed breakdown range ensures reliable turn-on margin above VWM with minimal variation. |
| VC @ IPPM | 72.7 V at 8.3 A - Clamping voltage during 600 W surge; limits stress on downstream ICs or MOSFETs. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 μs waveform; validates robustness against lightning-induced surges. |
| IFSM | 100 A - Non-repetitive forward surge current rating (8.3 ms half-sine); supports high-energy inductive load switching. |
| TJ max | +150 °C - Maximum junction temperature enables operation in under-hood automotive or industrial power supply environments. |
| Package | SMBG (DO-215AA) - Surface-mount outline with 0.235–0.255" body length; optimized for automated pick-and-place and thermal dissipation via copper pads. |
Pinout & Package
SMBG45A-M3/5B uses the SMBG (DO-215AA) package: a low-profile, gull-wing surface-mount case with two terminals. The cathode is marked by a band on the body; anode is unmarked. Mounting requires 5.0 mm × 5.0 mm copper pads per terminal for rated power derating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink | Connected to protected line; conducts transient current to ground when VREV > VBR. |
| Anode | Reference node | Typically tied to system ground or low-impedance return path; completes clamping loop during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance per stress test plan. |
| Halogen-free & RoHS compliant (M3) | Meets JEDEC J-STD-201 Class 2 whisker resistance and global environmental compliance without brominated flame retardants. |
| 600 W peak pulse power (10/1000 μs) | Enables single-device protection of 12 V/24 V power rails against ISO 7637-2 Pulse 1, 2a, 3a/b, and IEC 61000-4-5 surges. |
| Low incremental surge resistance | Minimizes VC overshoot during fast transients, improving clamping precision for sensitive logic-level interfaces. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free assembly without moisture sensitivity concerns or baking requirements. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 24 V battery-fed ECUs from load dump and alternator ripple in passenger vehicles and commercial trucks. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp transients exceeding 45 V while remaining non-conductive during normal operation. Use Value: Limits peak voltage to ≤72.7 V during 600 W surges, preventing damage to MCU power supplies and CAN transceivers. | Use Scenario: Shielding analog outputs (e.g., 4–20 mA current loops) of pressure/temperature sensors in factory automation systems. IC Role / Device Role / Timing Role: Bidirectional clamping is not used; SMBG45A-M3/5B serves as unidirectional rail-to-ground protector on sensor supply line. Use Value: Withstands repeated 1 kV EFT bursts (IEC 61000-4-4) due to fast response time and low clamping voltage. |
| Telecom DC Power Input Protection | Consumer Device USB Port Surge Suppression |
Use Scenario: Safeguarding PoE-powered network switches and base stations against induced surges on 48 V DC input lines. IC Role / Device Role / Timing Role: Primary overvoltage clamp on DC input stage upstream of DC-DC converters and hot-swap controllers. Use Value: 100 A IFSM rating handles high-current inductive kickback from relay-driven auxiliary circuits. | Use Scenario: Adding secondary-level surge immunity to USB Type-C power delivery inputs in smart home hubs and docking stations. IC Role / Device Role / Timing Role: Standoff-rated TVS on VBUS line to absorb contact ESD (±15 kV air, ±8 kV contact) and cable discharge events. Use Value: 72.7 V clamping ensures USB PD controller ICs (e.g., TUSB9261) remain within absolute maximum ratings during transient events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBG45A-E3/5B | Same electrical specs, but RoHS-compliant with brominated flame retardants (not halogen-free); M3 suffix denotes halogen-free molding compound. | Acceptable for industrial use where halogen-free requirement is not mandated; unsuitable for automotive or green-certified products. | Select SMBG45A-M3/5B when halogen-free compliance and AEC-Q101 qualification are mandatory. |
| SMBJ45A-M3/5B | Same VWM/VBR/VC, but SMBJ package (DO-214AB) has larger thermal mass and higher IPPM (12.5 A vs. 8.3 A); RθJA = 65 °C/W vs. 100 °C/W. | Better suited for higher-power or thermally constrained designs; SMBG offers smaller footprint for space-limited PCBs. | Choose SMBG45A-M3/5B for compact layouts requiring DO-215AA size; select SMBJ45A-M3/5B for enhanced thermal performance. |
Compared with SMBG45A-E3/5B, SMBG45A-M3/5B adds halogen-free compliance and AEC-Q101 qualification without sacrificing electrical performance; versus SMBJ45A-M3/5B, it trades 41% lower peak pulse current capability for 30% smaller board area and tighter layout control.
Availability
SMBG45A-M3/5B is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor modules, telecom power supplies, and consumer USB-PD devices requiring stable component supply across long production lifecycles.
Supply support for SMBG45A-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, efficiency, and application-specific optimization.
The SMBG TransZORB® series targets high-reliability transient suppression in automotive, industrial, and telecom infrastructure, engineered for AEC-Q101 compliance, automated assembly, and stable clamping under repetitive surge stress.
FAQ
What is the maximum clamping voltage of SMBG45A-M3/5B under rated surge conditions?
The SMBG45A-M3/5B exhibits a maximum clamping voltage (VC) of 72.7 V when subjected to its rated peak pulse current of 8.3 A using the standardized 10/1000 μs waveform. This value is measured per Figure 1 in Vishay document 88456 and defines the upper voltage limit imposed on protected circuitry during transient events. Maintaining VC below downstream IC absolute maximum ratings is critical for reliable system-level surge immunity - the SMBG45A-M3/5B achieves this while delivering 600 W pulse power handling.
Is SMBG45A-M3/5B suitable for automotive applications?
Yes, SMBG45A-M3/5B is AEC-Q101 qualified and explicitly rated for automotive use per Vishay's qualification report referenced in document 88456. Its construction includes glass-passivated junctions, halogen-free molding compound (M3 suffix), MSL Level 1 moisture sensitivity rating, and guaranteed operation from –55 °C to +150 °C. These attributes make SMBG45A-M3/5B appropriate for engine control units, body electronics, and ADAS power rail protection where sustained reliability under thermal and mechanical stress is required.
How does the M3 suffix differ from E3 in SMBG45A-M3/5B?
The M3 suffix in SMBG45A-M3/5B indicates halogen-free, RoHS-compliant construction meeting JEDEC J-STD-201 Class 2 whisker resistance, whereas E3 denotes RoHS compliance without halogen-free assurance. Both share identical electrical characteristics and packaging, but M3 is required for automotive and green-certified industrial designs. Vishay specifies M3 parts for applications demanding full material compliance - SMBG45A-M3/5B satisfies this need while retaining the same 45 V VWM, 50.0–55.3 V VBR, and 72.7 V VC performance as its E3 counterpart.
What is the recommended PCB pad layout for SMBG45A-M3/5B?
Vishay specifies a minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad for each terminal of SMBG45A-M3/5B to achieve rated 600 W peak pulse power and proper thermal derating above 25 °C ambient. The pad layout must accommodate the SMBG (DO-215AA) gull-wing leadform with 0.038–0.058" lead width and 0.130–0.155" terminal spacing. Proper pad design ensures mechanical stability during reflow and optimal heat dissipation - undersized pads reduce surge current capability and increase risk of solder joint fracture under thermal cycling.
Does SMBG45A-M3/5B support bidirectional transient suppression?
No, SMBG45A-M3/5B is a unidirectional transient voltage suppressor, indicated by the "A" suffix (as opposed to "CA" for bidirectional variants). Its cathode band marks the terminal that must be connected toward the protected line, with the anode grounded. For bidirectional protection - such as AC signal lines or differential buses - engineers must select the SMBG45CA-M3/5B variant, which provides symmetrical clamping in both polarities and omits the cathode marking. Using SMBG45A-M3/5B in bidirectional configurations risks forward conduction and failure during negative transients.
SMBG45A-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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 8.3A
- 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)
SMBG45A-M3/5B FAQ
1.How can I place an order for SMBG45A-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG45A-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 SMBG45A-M3/5B reliable?
The price and inventory of SMBG45A-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 SMBG45A-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBG45A-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG45A-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG45A-M3/5B?
SMBG45A-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG45A-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 SMBG45A-M3/5B?
For technical support, including SMBG45A-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG45A-M3/5B requirements.
6.How does Aetrix verify that SMBG45A-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBG45A-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 SMBG45A-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBG45A-M3/5B?
All SMBG45A-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBG45A-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 SMBG45A-M3/5B part is unused and in its original packaging.
Return procedure for SMBG45A-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG45A-M3/5B Tags
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