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Vishay General Semiconductor - Diodes Division SMBG40CA-E3/5B
- Part No.:
- SMBG40CA-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG40CA-E3/5B.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,355
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Product details
Overview
SMBG40CA-E3/5B 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 40 V stand-off voltage (VWM), 44.4–49.1 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 µs), clamping voltage of 64.5 V at 9.3 A, and AEC-Q101 qualification for automotive use.
For engineers reviewing the SMBG40CA-E3/5B datasheet, SMBG40CA-E3/5B pinout, SMBG40CA-E3/5B application, or SMBG40CA-E3/5B equivalent, this device is evaluated for ESD/surge immunity in bidirectional DC bus lines, sensor interfaces, and automotive infotainment power rails where low clamping ratio and MSL Level 1 reflow compatibility are critical.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR, IPPM, and VC specifications in either direction. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and fast response time (<1 ns), enabling protection against ESD (IEC 61000-4-2) and lightning-induced surges (IEC 61000-4-5).
The SMBG40CA-E3/5B uses a planar junction structure housed in an SMBG (DO-215AA) thermally optimized package with 20 °C/W junction-to-lead thermal resistance. It supports repetitive surge duty cycles up to 0.01 % and is rated for operation from –55 °C to +150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 36–42 V nominal systems. |
| VBR (min/max) | 44.4 V / 49.1 V at 1 mA - Confirmed breakdown threshold range; ensures reliable triggering without premature conduction. |
| VC @ IPPM | 64.5 V at 9.3 A - Clamped voltage during 600 W transient; limits downstream IC stress to <65 V under worst-case surge. |
| PPPM | 600 W (10/1000 µs) - Peak surge power handling capacity; meets industrial and automotive surge immunity requirements. |
| ID @ VWM | ≤1.0 µA - Ultra-low reverse leakage at stand-off voltage; preserves signal integrity and minimizes standby power loss. |
| TJ max | +150 °C - Maximum junction temperature rating; enables deployment in under-hood automotive environments. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD47. |
Pinout & Package
Package: SMBG (DO-215AA), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.57 mm × 3.94 mm × 2.10 mm (L × W × H); matte tin-plated leads compliant with J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative half-cycle) | Conducts surge current when voltage falls below –VBR; symmetrical with cathode for bidirectional clamping. |
| Cathode | Transient current entry (positive half-cycle) | Conducts surge current when voltage exceeds +VBR; electrically identical to anode in CA-series devices. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping symmetry | Identical VBR, VC, and IPPM in both directions - eliminates need for polarity-aware layout in AC-coupled or floating lines. |
| 600 W peak pulse power | Withstands 10/1000 µs transients up to 9.3 A - protects against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 surges. |
| Low clamping ratio (VC/VBR ≈ 1.38) | 64.5 V / 46.75 V (typ.) - minimizes overvoltage overshoot during clamping, reducing stress on protected MOSFETs or CAN transceivers. |
| AEC-Q101 qualification | Validated for automotive under-hood applications - includes HTOL, TC, and ESD testing per stress test conditions in JESD47. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles - no floor life limitation or baking required prior to assembly. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs and infotainment modules from load dump and alternator transients. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed upstream of DC-DC converters and LDOs to limit input voltage excursions. Use Value: Clamps ISO 7637-2 Pulse 5a (75 V/100 ms) to <65 V, preventing converter shutdown or internal FET avalanche failure. | Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) connected to PLC I/O modules exposed to field wiring surges. IC Role / Device Role / Timing Role: Low-capacitance TVS placed at connector interface to absorb induced transients before reaching ADC front-end. Use Value: Sub-1 µA leakage at 40 V preserves microvolt-level signal accuracy; 600 W rating handles IEC 61000-4-4 EFT bursts without degradation. |
| Telecom Data Line Protection | Consumer USB Power Delivery |
Use Scenario: Shielding RS-485 transceivers and Ethernet PHYs in base station backhaul equipment from lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Paired differential-line TVS on twisted-pair inputs to suppress asymmetric transients while maintaining signal integrity. Use Value: Symmetrical VBR ensures balanced clamping on A/B lines; DO-215AA footprint allows compact dual-device placement. | Use Scenario: Overvoltage protection on VBUS lines of USB-C PD ports in portable monitors and docking stations. IC Role / Device Role / Timing Role: Secondary clamp after primary fuse or eFuse, absorbing residual surges that bypass upstream protection. Use Value: 40 V VWM aligns with USB PD 3.0 20 V max + safety margin; 64.5 V VC stays below 65 V absolute maximum rating of common PD controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40CA-E3/52 | Same VWM/VBR/VC, but SMB (DO-214AA) package (larger footprint, higher RθJA = 110 °C/W) | Less suitable for high-density automotive PCBs; lower thermal performance in confined layouts | Select SMBG40CA-E3/5B when board space or thermal management is constrained. |
| 1.5KE40CA | Same electrical specs but axial-leaded DO-201AD package; 1500 W rating but slower response due to wirebond inductance | Not SMT-compatible; unsuitable for automated assembly or vibration-prone environments | Choose SMBG40CA-E3/5B for surface-mount production, AEC-Q101 compliance, and sub-ns response. |
Compared with SMBJ40CA-E3/52 and 1.5KE40CA, the SMBG40CA-E3/5B delivers identical clamping performance in a smaller, thermally superior, and automotive-qualified surface-mount package-enabling higher board density and improved surge reliability in space-constrained, high-reliability designs.
Availability
SMBG40CA-E3/5B is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom data line surge suppression requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMBG40CA-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, efficiency, and application-specific optimization.
The SMBG series was engineered for high-power, low-profile transient suppression in automotive and industrial environments-prioritizing AEC-Q101 compliance, MSL Level 1 reflow capability, and symmetrical bidirectional performance in compact surface-mount form.
FAQ
What does the "CA" suffix indicate in SMBG40CA-E3/5B?
The "CA" suffix denotes a bidirectional configuration: SMBG40CA-E3/5B provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., SMBG40A), it has no cathode marking and identical electrical characteristics in either polarity-making it ideal for AC-coupled lines, differential buses, or floating grounds where polarity reversal may occur during transients.
Is SMBG40CA-E3/5B suitable for automotive under-hood applications?
Yes, SMBG40CA-E3/5B is AEC-Q101 qualified and rated for junction temperatures up to +150 °C. Its glass-passivated junction, MSL Level 1 reflow compatibility (260 °C peak), and validated performance across temperature cycling and humidity testing make it appropriate for engine control units, body control modules, and ADAS power supplies where thermal and mechanical robustness are essential.
What is the clamping voltage of SMBG40CA-E3/5B at its rated peak pulse current?
The SMBG40CA-E3/5B exhibits a maximum clamping voltage (VC) of 64.5 V at its peak pulse current (IPPM) of 9.3 A, measured with a 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and reflects the actual voltage seen by downstream circuitry during a 600 W surge event-critical for ensuring protected ICs remain within their absolute maximum ratings.
How does the SMBG (DO-215AA) package compare to SMB (DO-214AA) in thermal performance?
The SMBG (DO-215AA) package used by SMBG40CA-E3/5B offers a typical junction-to-lead thermal resistance (RθJL) of 20 °C/W, versus ~30–35 °C/W for standard SMB packages. Its wider copper pad contact area and optimized leadframe geometry improve heat dissipation-particularly beneficial in high-duty-cycle surge environments or densely packed automotive PCBs where thermal management is critical.
Can SMBG40CA-E3/5B be used in place of a unidirectional TVS like SMBG40A?
No-SMBG40CA-E3/5B is strictly bidirectional and lacks polarity marking, whereas SMBG40A is unidirectional with a cathode band. Substituting them requires verifying system-level polarity constraints: SMBG40CA-E3/5B may conduct during normal forward bias if placed incorrectly in DC circuits, potentially causing latch-up or excessive leakage. Always match device polarity type to the circuit's voltage reference architecture.
SMBG40CA-E3/5B 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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 9.3A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBG)
SMBG40CA-E3/5B FAQ
1.How can I place an order for SMBG40CA-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG40CA-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 SMBG40CA-E3/5B reliable?
The price and inventory of SMBG40CA-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 SMBG40CA-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBG40CA-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG40CA-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG40CA-E3/5B?
SMBG40CA-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG40CA-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 SMBG40CA-E3/5B?
For technical support, including SMBG40CA-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG40CA-E3/5B requirements.
6.How does Aetrix verify that SMBG40CA-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBG40CA-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 SMBG40CA-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBG40CA-E3/5B?
All SMBG40CA-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBG40CA-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 SMBG40CA-E3/5B part is unused and in its original packaging.
Return procedure for SMBG40CA-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG40CA-E3/5B Tags
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