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Vishay General Semiconductor - Diodes Division SMBG40CAHE3/5B
- Part No.:
- SMBG40CAHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG40CAHE3/5B.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,393
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Product details
Overview
SMBG40CAHE3/5B 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-grade reliability.
For engineers reviewing the SMBG40CAHE3/5B datasheet, SMBG40CAHE3/5B pinout, SMBG40CAHE3/5B application, or SMBG40CAHE3/5B equivalent, key selection criteria include bidirectional surge handling, low clamping ratio (VC/VBR ≈ 1.38), MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on PCBs requiring IEC 61000-4-2/4-4/4-5 compliance.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ leakage at 40 V), but triggers into low-impedance conduction when transient voltage exceeds VBR, diverting surge current away from downstream ICs. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability under repetitive surges.
The SMBG40CAHE3/5B is engineered for unclamped inductive switching transients and lightning-induced surges in automotive ECUs, sensor interfaces, and industrial control I/O. Its 100 °C/W junction-to-ambient thermal resistance and -55 °C to +150 °C operating range support deployment in harsh under-hood or factory-floor environments without derating penalties below 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse working voltage before leakage exceeds 1 μA; defines safe operating ceiling for protected line. |
| VBR (min/max) | 44.4 V / 49.1 V at 1 mA - Confirmed breakdown threshold range; ensures reliable triggering above system nominal voltage. |
| VC @ IPPM | 64.5 V at 9.3 A - Clamped voltage during 600 W surge; limits stress on downstream MOSFETs or microcontrollers. |
| PPPM | 600 W (10/1000 μs) - Peak surge energy absorption capacity; meets IEC 61000-4-5 Level 4 immunity requirements. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in engine control units without external heatsinking. |
| AEC-Q101 | Qualified - Validated for automotive electronics per stress test standard; supports PPAP documentation for Tier 1 suppliers. |
Pinout & Package
Package: SMBG (DO-215AA), surface-mount, bidirectional configuration with no polarity marking; matte tin-plated leads compliant with J-STD-002 solderability and JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (positive half-cycle) | Conducts surge current during positive-going transients; symmetric with cathode due to bidirectional design. |
| Cathode | Transient current entry (negative half-cycle) | Conducts surge current during negative-going transients; electrically identical to anode in CA-series devices. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., CAN bus, RS-485) without polarity concerns. |
| 600 W peak pulse power | Handles 4 kV ESD (IEC 61000-4-2) and 2 kV surge (IEC 61000-4-5) events without degradation across >1000 cycles. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes voltage overshoot during clamping-critical for protecting 3.3 V or 5 V logic interfaces downstream. |
| AEC-Q101 qualification | Validates performance under temperature cycling, HTRB, and mechanical shock-required for automotive body control modules and ADAS sensors. |
Applications
| Automotive Sensor Protection | Industrial I/O 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: Shunt TVS element placed directly at connector entry point to clamp transients before reaching ADC input or signal conditioner. Use Value: Prevents sensor signal corruption and microcontroller reset during 12 V battery line disturbances up to ±100 V/500 ms. | Use Scenario: Safeguarding 24 V PLC digital input channels against inductive kickback from solenoid valves and contactors. IC Role / Device Role / Timing Role: Primary overvoltage clamp on field-side input traces, coordinated with series current-limiting resistor. Use Value: Enables reliable 24 V DC input operation with <100 ns response time and no degradation after 10,000 surge events. |
| Automotive CAN Bus Protection | Consumer Power Adapter Input |
Use Scenario: Bidirectional protection of CAN_H/CAN_L differential pair in telematics control units subjected to ESD and coupled noise. IC Role / Device Role / Timing Role: Common-mode TVS pair (one per line) with matched VBR to preserve differential signaling integrity. Use Value: Maintains CAN FD bit rate stability (<1 ns jitter impact) while suppressing ±8 kV contact ESD per IEC 61000-4-2. | Use Scenario: Input-stage surge suppression in USB-C PD adapters where primary-side transients threaten controller ICs. IC Role / Device Role / Timing Role: First-line defense between AC-DC rectifier output and primary-side PWM controller supply rail. Use Value: Absorbs 600 W line-to-ground surges without latch-up, enabling compact design with no secondary crowbar circuitry. |
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-E3/5B | Same VWM/VBR/PPPM, but SMBJ (DO-214AA) package; 1.5× larger footprint and 120 °C/W RθJA. | Less suitable for space-constrained automotive modules; preferred where higher thermal mass improves surge endurance. | Select SMBJ40CA-E3/5B only if board layout allows larger pad area and thermal relief is prioritized over density. |
| SMCJ40CAHE3/5B | Same electrical specs, but SMC (DO-214AB) package; 2.5× higher PPPM rating (1500 W) and 50 °C/W RθJA. | Over-specified for most 600 W use cases; adds cost and volume where SMBG-level protection suffices. | Choose SMCJ40CAHE3/5B only when legacy designs require backward-compatible footprint or extreme surge margin is mandated. |
Compared with SMBJ40CA-E3/5B and SMCJ40CAHE3/5B, the SMBG40CAHE3/5B delivers optimal balance of automotive-grade reliability, compact DO-215AA footprint, and precise 600 W surge capability-making it the preferred choice for new ECU and ADAS sensor designs where PCB real estate and thermal profile are constrained.
Availability
SMBG40CAHE3/5B is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O interface hardening, and consumer power adapter input staging requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMBG40CAHE3/5B 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 automotive, industrial, and computing applications.
The SMBG series was developed specifically for high-reliability surface-mount transient suppression in space-constrained automotive electronics, combining AEC-Q101 validation with optimized thermal and surge performance in the DO-215AA outline.
FAQ
What is the maximum clamping voltage of the SMBG40CAHE3/5B under a 600 W surge?
The SMBG40CAHE3/5B clamps to 64.5 V at its rated peak pulse current of 9.3 A (10/1000 μs waveform). This value is measured per Figure 1 in Vishay document 88456 and represents the upper limit of voltage seen by protected circuitry during worst-case surge events. The SMBG40CAHE3/5B maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is SMBG40CAHE3/5B suitable for protecting CAN FD bus lines?
Yes, the SMBG40CAHE3/5B is widely deployed for CAN FD protection due to its bidirectional symmetry, low capacitance (<100 pF at 0 V), and fast response time (<1 ns). Its 40 V VWM aligns with typical CAN common-mode voltage ranges, and AEC-Q101 qualification ensures robustness in automotive network nodes. The SMBG40CAHE3/5B must be placed as close as possible to the connector with matched trace lengths to preserve differential integrity.
Does SMBG40CAHE3/5B have polarity markings on the package?
No, the SMBG40CAHE3/5B has no polarity markings because it is a bidirectional TVS diode-the anode and cathode terminals are functionally identical and interchangeable in circuit layout. This eliminates orientation errors during automated placement and simplifies PCB design for AC-coupled or floating signal paths where polarity is undefined.
What is the moisture sensitivity level (MSL) rating for SMBG40CAHE3/5B?
The SMBG40CAHE3/5B is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life at ≤30 °C/60% RH and requires no baking prior to reflow. This simplifies manufacturing logistics and supports lead-free reflow profiles up to 260 °C peak temperature, making the SMBG40CAHE3/5B compatible with standard SMT assembly lines without special handling.
How does the thermal resistance of SMBG40CAHE3/5B affect its surge capability at elevated ambient temperatures?
The SMBG40CAHE3/5B has a typical RθJA of 100 °C/W. At 85 °C ambient, its usable peak pulse power drops to ~420 W (per Figure 2 derating curve), requiring design margin adjustment. For sustained high-temperature operation, the SMBG40CAHE3/5B should be mounted on minimum 5.0 mm × 5.0 mm copper pads per terminal to maintain specified 600 W rating at 25 °C ambient.
SMBG40CAHE3/5B 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBG)
SMBG40CAHE3/5B FAQ
1.How can I place an order for SMBG40CAHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG40CAHE3/5B 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 SMBG40CAHE3/5B reliable?
The price and inventory of SMBG40CAHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG40CAHE3/5B is usually 5 days.
3.What payment methods are accepted for SMBG40CAHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG40CAHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG40CAHE3/5B?
SMBG40CAHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG40CAHE3/5B 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 SMBG40CAHE3/5B?
For technical support, including SMBG40CAHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG40CAHE3/5B requirements.
6.How does Aetrix verify that SMBG40CAHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMBG40CAHE3/5B 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 SMBG40CAHE3/5B meets industry standards.
7.What is the process for return or replacement of SMBG40CAHE3/5B?
All SMBG40CAHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBG40CAHE3/5B, 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 SMBG40CAHE3/5B part is unused and in its original packaging.
Return procedure for SMBG40CAHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG40CAHE3/5B Tags
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