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Vishay General Semiconductor - Diodes Division SMBG45CA-M3/5B
- Part No.:
- SMBG45CA-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG45CA-M3/5B.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO215AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMBG45CA-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 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-M3/5B datasheet, SMBG45CA-M3/5B pinout, SMBG45CA-M3/5B application, or SMBG45CA-M3/5B equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification, 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 shunt protector, responding within <1 ps to transients by avalanche conduction when reverse voltage exceeds VBR. Its bidirectional structure enables symmetrical clamping in both polarities without polarity marking, supporting AC-coupled or floating signal lines.
Thermal performance is defined by RθJA = 100 °C/W (on 0.2" × 0.2" pads) and TJ(max) = +150 °C, with derating above 25 °C per Fig. 2. It meets J-STD-020 MSL Level 1 and passes JESD201 Class 2 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin below system rail. |
| VBR (min/max) | 50.0 V / 55.3 V at 1 mA - Confirmed breakdown threshold ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 72.7 V at 8.3 A - Clamping voltage under 10/1000 μs surge defines worst-case stress on downstream ICs. |
| PPPM | 600 W - Peak pulse power handling capability with 0.01% duty cycle; validates robustness against lightning/inductive spikes. |
| IFSM | Not applicable - Bidirectional configuration excludes forward surge rating (unidirectional only). |
| TJ(max) | +150 °C - Maximum junction temperature supports operation in under-hood automotive environments. |
| Package | SMBG (DO-215AA) - Surface-mount gull-wing package with 5.97 mm × 4.06 mm footprint and 1.96 mm height; optimized for high-volume pick-and-place. |
Pinout & Package
SMBG45CA-M3/5B uses a 2-terminal SMBG (DO-215AA) package with gull-wing leads. As a bidirectional TVS, it has no polarity marking; both terminals are functionally identical and interchangeable in circuit layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient shunt path | Either terminal connects to protected line; clamps voltage symmetrically during positive or negative transients. |
| Case / Body | Non-conductive thermal path | Molding compound meets UL 94 V-0; no electrical connection - serves only mechanical and thermal dissipation role. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD - required for engine control, ADAS, and body electronics. |
| 600 W peak pulse power (10/1000 μs) | Withstands ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 surges without degradation when mounted per recommended pad layout. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets EU Directive 2011/65/EU and JEDEC J-STD-20; eliminates brominated flame retardants for safer end-of-life processing. |
| Low incremental surge resistance | Enables tighter clamping (VC − VBR = 22.7 V) and faster energy diversion - critical for protecting 3.3 V/5 V logic interfaces. |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free reflow profiles without preconditioning; eliminates moisture-related popcorning risk during assembly. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN, LIN, or analog sensor inputs (e.g., pressure, temperature) from load dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Shunt TVS placed directly at connector or header to clamp fast-rising transients before they reach signal conditioning amplifiers or microcontroller ADC inputs. Use Value: Prevents latch-up or permanent damage to 5 V tolerant interface ICs while maintaining signal integrity due to low capacitance (<100 pF at 0 V). | Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to 24 V DC field wiring surges and relay contact bounce. IC Role / Device Role / Timing Role: Bidirectional clamping element across input terminals to absorb ±1 kV EFT bursts and 0.5 kV surge events per IEC 61000-4-4/4-5. Use Value: Enables compliance with industrial immunity standards without adding series impedance or signal delay - preserves real-time response of discrete input scanning. |
| Telecom Line Interface | Consumer Power Adapter ESD Protection |
Use Scenario: Secondary-side protection of Ethernet PHY or RS-485 transceivers in network edge devices subjected to lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Common-mode TVS across differential pair (e.g., A/B lines) to suppress asymmetrical transients while preserving differential signaling integrity. Use Value: Maintains >20 dB common-mode rejection ratio (CMRR) up to 10 MHz due to matched internal structure and low parasitic inductance. | Use Scenario: Input-stage surge suppression in USB-C PD adapters and wireless charging base stations where compact size and high reliability are mandatory. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 5–20 V input rails to prevent MOSFET gate oxide failure and controller IC latch-up during hot-plug or cable fault events. Use Value: Achieves >10,000 surge cycles at rated PPPM without parameter shift - validated per AEC-Q101 stress test conditions. |
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-M3/5B | Same VWM/VBR/VC, but lower PPPM = 600 W (same rating) and higher IPPM = 8.3 A; identical SMB package and AEC-Q101 qualification. | No functional difference in protection level; SMBJ variant uses slightly different thermal pad layout per JEDEC DO-214AA. | Select SMBJ45CA-M3/5B only if legacy board design uses DO-214AA footprint; SMBG offers superior thermal resistance (RθJL = 20 °C/W vs. ~25 °C/W). |
| SMCJ45CA-M3/5B | Higher PPPM = 1500 W, larger SMC (DO-214AB) package, same VWM/VBR; not AEC-Q101 qualified in M3 version. | Used where higher surge margin is needed (e.g., mains-connected equipment); requires PCB area increase (~7.1 mm × 6.2 mm). | Choose SMCJ45CA-M3/5B only when 600 W is insufficient and automotive qualification is not required; otherwise SMBG45CA-M3/5B provides optimal size/performance balance. |
Compared with SMBJ45CA-M3/5B and SMCJ45CA-M3/5B, SMBG45CA-M3/5B delivers identical clamping performance in a smaller footprint with certified automotive reliability - making it the preferred choice for space-constrained, AEC-Q101–mandated designs such as ADAS camera modules and battery management sensors.
Availability
SMBG45CA-M3/5B is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and telecom infrastructure requiring stable component supply, halogen-free compliance, and AEC-Q101 validation.
Supply support for SMBG45CA-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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBG series was engineered for high-reliability surface-mount transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where consistent clamping, low leakage, and long-term stability are non-negotiable.
FAQ
What does the "CA" suffix indicate in SMBG45CA-M3/5B?
The "CA" suffix denotes a bidirectional configuration, meaning SMBG45CA-M3/5B provides symmetrical transient voltage suppression for both positive and negative polarity surges. Unlike unidirectional variants (e.g., SMBG45A), it has no cathode band marking and exhibits matched VBR and VC characteristics in either direction - essential for AC-coupled or floating signal paths.
Is SMBG45CA-M3/5B suitable for automotive applications?
Yes, SMBG45CA-M3/5B is AEC-Q101 qualified and explicitly rated for automotive use. Its construction includes glass-passivated junctions, halogen-free molding compound (M3 suffix), and validation across temperature cycling, high-temperature reverse bias, and ESD tests - meeting requirements for engine control units, body electronics, and ADAS sensor interfaces.
What is the maximum clamping voltage of SMBG45CA-M3/5B under surge conditions?
The maximum clamping voltage (VC) of SMBG45CA-M3/5B is 72.7 V at 8.3 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during standardized surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
How does the SMBG (DO-215AA) package differ from SMB (DO-214AA)?
The SMBG (DO-215AA) package used by SMBG45CA-M3/5B features gull-wing leads with tighter pitch (2.3 mm vs. 2.54 mm) and reduced overall height (1.96 mm vs. 2.3 mm) compared to SMB (DO-214AA). It also provides lower thermal resistance (RθJL = 20 °C/W) and is optimized for fine-pitch automated placement - distinguishing it from legacy SMB outlines.
Can SMBG45CA-M3/5B replace SMBG45A in an existing design?
No - SMBG45CA-M3/5B is bidirectional while SMBG45A is unidirectional, so direct replacement requires circuit review. SMBG45A has a cathode band and conducts forward current (IFSM = 100 A), whereas SMBG45CA-M3/5B has no polarity marking and blocks in both directions until breakdown. Swapping without adjusting layout or grounding may cause malfunction or failure.
SMBG45CA-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):
- 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-M3/5B FAQ
1.How can I place an order for SMBG45CA-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG45CA-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 SMBG45CA-M3/5B reliable?
The price and inventory of SMBG45CA-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 SMBG45CA-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBG45CA-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG45CA-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG45CA-M3/5B?
SMBG45CA-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG45CA-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 SMBG45CA-M3/5B?
For technical support, including SMBG45CA-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG45CA-M3/5B requirements.
6.How does Aetrix verify that SMBG45CA-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBG45CA-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 SMBG45CA-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBG45CA-M3/5B?
All SMBG45CA-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBG45CA-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 SMBG45CA-M3/5B part is unused and in its original packaging.
Return procedure for SMBG45CA-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG45CA-M3/5B Tags
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