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Vishay General Semiconductor - Diodes Division SMBG45CA-M3/52
- Part No.:
- SMBG45CA-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG45CA-M3/52.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,837
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Product details
Overview
SMBG45CA-M3/52 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMBG (DO-215AA) package, designed for clamping ESD and surge transients on signal/power 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 - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMBG45CA-M3/52 datasheet, SMBG45CA-M3/52 pinout, SMBG45CA-M3/52 application, or SMBG45CA-M3/52 equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification, halogen-free RoHS compliance (M3 suffix), low incremental surge resistance, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped crowbar during transient events, leveraging an avalanche breakdown mechanism to divert surge energy away from downstream circuitry. Its bidirectional structure enables symmetric clamping in both polarities without polarity sensitivity, making it suitable for AC-coupled or floating signal paths such as CAN bus stubs, RS-485 differential pairs, and automotive LIN lines.
The SMBG45CA-M3/52 exhibits a typical junction-to-lead thermal resistance of 20 °C/W and junction-to-ambient of 100 °C/W, supporting operation from –55 °C to +150 °C. It meets J-STD-020 MSL Level 1 (peak reflow 260 °C), has matte tin-plated leads compliant with JESD 22-B102, and passes JESD 201 Class 2 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 36 V nominal automotive systems. |
| VBR (min/max) | 50.0 V / 55.3 V at 1 mA - Confirmed breakdown threshold range ensures reliable turn-on under surge conditions without premature conduction. |
| VC @ IPPM | 72.7 V at 8.3 A - Clamping voltage under 10/1000 μs surge limits stress on protected ICs like microcontrollers or transceivers. |
| PPPM | 600 W - Peak pulse power handling capacity supports IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly mounted. |
| IPPM | 8.3 A - Peak pulse current capability derived from PPPM/VC; validates robustness against repetitive transients at 0.01% duty cycle. |
| TJ max | +150 °C - Maximum junction temperature rating enables use in under-hood automotive environments and high-temperature industrial enclosures. |
| Qualification | AEC-Q101 qualified - Certified for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JEDEC standards. |
Pinout & Package
Package: SMBG (DO-215AA), surface-mount, low-profile gull-wing lead frame with cathode/anode terminals on opposite ends; no polarity marking for bidirectional variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (positive half-cycle) | Connects to line under protection; forms one side of symmetrical clamping path in bidirectional configuration. |
| Cathode | Transient current entry point (negative half-cycle) | Connects to same line as Anode - bidirectional operation means both terminals serve identical clamping roles depending on voltage polarity. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping symmetry | Identical VBR and VC performance in both directions enables single-device protection of AC or floating signals without polarity concerns. |
| 600 W peak pulse power (10/1000 μs) | Supports high-energy surge suppression per IEC 61000-4-5 while maintaining low clamping voltage for sensitive 3.3 V/5 V logic interfaces. |
| AEC-Q101 qualification | Validated for automotive applications including engine control units, body electronics, and ADAS sensor modules requiring extended temperature and life-cycle reliability. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for industrial and automotive OEMs; compatible with lead-free reflow profiles up to 260 °C peak. |
| Low-profile SMBG package | 0.235" × 0.130" footprint with 0.030" height enables dense PCB layouts and automated pick-and-place assembly without tombstoning risk. |
Applications
| Automotive Sensor Protection | Industrial RS-485 Interface |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine bay environments exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed between sensor signal line and ground to shunt transients before reaching ADC input or signal conditioner. Use Value: Prevents latch-up or permanent damage to 12-bit SAR ADCs by limiting transient voltage to ≤72.7 V during 100 V/50 ms load dump events. | Use Scenario: Safeguarding differential data lines in factory automation PLCs using RS-485 transceivers operating over long cable runs. IC Role / Device Role / Timing Role: Bidirectional clamping device across A/B bus lines to absorb EFT bursts and lightning-induced surges without disrupting DC bias. Use Value: Maintains signal integrity during 4 kV EFT (IEC 61000-4-4) by clamping common-mode transients within 1 ns response time and limiting bus voltage excursion. |
| Consumer USB-C Port ESD | Telecom DSL Line Protection |
Use Scenario: Secondary-level ESD protection on USB-C CC and VCONN lines in portable docking stations subject to human-body-model discharges. IC Role / Device Role / Timing Role: Fast-response TVS placed after primary polymer PTC fuse to clamp ±15 kV HBM events before reaching USB PD controller. Use Value: Limits induced voltage on CC line to <75 V during ESD event, preserving USB PD negotiation state and preventing false disconnect detection. | Use Scenario: Overvoltage protection on twisted-pair DSL subscriber lines exposed to induced lightning surges and power cross events. IC Role / Device Role / Timing Role: Bidirectional surge suppressor connected between tip/ring conductors and ground to divert longitudinal surges exceeding 45 V RMS. Use Value: Enables compliance with GR-909 telecom surge immunity requirements by clamping 10/1000 μs surges up to 600 W without degradation after 1000 strikes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45CA-M3/52 | Same VWM/VBR/VC, but lower PPPM = 600 W (same rating) yet higher IPPM = 11.7 A due to improved thermal design; SMBJ package is slightly larger (DO-214AB). | Suitable for space-tolerant designs where board real estate allows larger footprint; preferred for higher-reliability telecom base stations. | Select SMBJ45CA-M3/52 if layout permits DO-214AB and higher surge repetition rate is required. |
| SMCJ45CA-M3/52 | Same electrical specs but in larger SMC (DO-214AB) package with 1500 W PPPM; physically incompatible with SMBG footprints. | Used in high-energy industrial motor drives where 1500 W surge handling is mandated by IEC 61800-3. | Choose SMCJ45CA-M3/52 only when upgrading to higher-power protection and redesigning PCB pad layout. |
Compared with SMBG45CA-M3/52, SMBJ45CA-M3/52 offers identical clamping performance in a marginally larger package with better thermal dissipation for repetitive surges, while SMCJ45CA-M3/52 delivers triple the pulse power but requires mechanical redesign - making SMBG45CA-M3/52 optimal for space-constrained AEC-Q101 automotive modules.
Availability
SMBG45CA-M3/52 is available at Aetrix Electronics and suitable for automotive sensor modules, industrial RS-485 networks, consumer USB-C docking stations, and telecom DSL line cards requiring stable component supply with full traceability and lifecycle management.
Supply support for SMBG45CA-M3/52 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 series was developed for high-density, AEC-Q101-compliant transient suppression in automotive and industrial environments where low profile, bidirectional symmetry, and halogen-free compliance are mandatory design requirements.
FAQ
What does the "CA" suffix indicate in SMBG45CA-M3/52?
The "CA" suffix in SMBG45CA-M3/52 denotes a bidirectional transient voltage suppressor configuration, meaning the device provides symmetrical clamping in both positive and negative voltage polarities. This eliminates the need to observe polarity during placement and makes SMBG45CA-M3/52 ideal for protecting AC-coupled or floating signal lines such as CAN, RS-485, or telecom lines where voltage reversals occur. Unidirectional variants use "A" only.
Is SMBG45CA-M3/52 suitable for automotive applications?
Yes, SMBG45CA-M3/52 is AEC-Q101 qualified and rated for operation from –55 °C to +150 °C, making it suitable for under-hood and body-control automotive applications. Its halogen-free (M3) construction, MSL Level 1 reflow compatibility, and validated surge performance per ISO 7637-2 and IEC 61000-4-5 support use in ECUs, ADAS camera modules, and battery management systems where SMBG45CA-M3/52 serves as primary transient protection.
What is the maximum clamping voltage of SMBG45CA-M3/52 and at what current?
The maximum clamping voltage (VC) of SMBG45CA-M3/52 is 72.7 V, measured at a peak pulse current (IPPM) of 8.3 A using the standard 10/1000 μs double-exponential waveform. This value is guaranteed across temperature and ensures protected downstream components - such as 75 V-rated CAN transceivers or 3.3 V microcontroller I/O pins - remain within safe voltage margins during surge events.
How does the M3 suffix affect SMBG45CA-M3/52's compliance and assembly?
The M3 suffix in SMBG45CA-M3/52 indicates halogen-free, RoHS-compliant construction with matte tin-plated leads that meet J-STD-002 solderability and JESD 22-B102 solder heat requirements. It also satisfies JESD 201 Class 2 whisker resistance, enabling reliable lead-free reflow assembly at peak temperatures up to 260 °C without voiding or dewetting - critical for high-yield manufacturing of SMBG45CA-M3/52 in automotive and industrial PCBs.
Can SMBG45CA-M3/52 replace unidirectional TVS diodes in existing designs?
No - SMBG45CA-M3/52 is strictly bidirectional and lacks polarity marking; substituting it for a unidirectional part (e.g., SMBG45A-M3/52) may compromise protection on DC-biased lines where forward conduction must be blocked. While SMBG45CA-M3/52 provides identical VWM and VC, its symmetrical behavior means it conducts during normal positive DC bias, potentially loading the circuit. Always verify bias conditions before replacing unidirectional TVS with SMBG45CA-M3/52.
SMBG45CA-M3/52 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):
- 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)
SMBG45CA-M3/52 FAQ
1.How can I place an order for SMBG45CA-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG45CA-M3/52 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 SMBG45CA-M3/52 reliable?
The price and inventory of SMBG45CA-M3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG45CA-M3/52 is usually 5 days.
3.What payment methods are accepted for SMBG45CA-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG45CA-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG45CA-M3/52?
SMBG45CA-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG45CA-M3/52 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 SMBG45CA-M3/52?
For technical support, including SMBG45CA-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG45CA-M3/52 requirements.
6.How does Aetrix verify that SMBG45CA-M3/52 is sourced from the original manufacturer or authorized distributors?
All SMBG45CA-M3/52 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 SMBG45CA-M3/52 meets industry standards.
7.What is the process for return or replacement of SMBG45CA-M3/52?
All SMBG45CA-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBG45CA-M3/52, 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 SMBG45CA-M3/52 part is unused and in its original packaging.
Return procedure for SMBG45CA-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG45CA-M3/52 Tags
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