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Vishay General Semiconductor - Diodes Division SMBJ40CAHE3/52
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- Part No.:
- SMBJ40CAHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40CAHE3/52.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,499
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Product details
Overview
SMBJ40CAHE3/52 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 40 V stand-off voltage (VWM), 64.5 V maximum clamping voltage (VC) at 9.3 A peak pulse current (IPPM), 600 W peak pulse power (10/1000 µs), and AEC-Q101 qualification for automotive use - deployed to protect MOSFETs, ICs, and sensor interfaces against inductive switching surges.
For engineers reviewing the SMBJ40CAHE3/52 datasheet, SMBJ40CAHE3/52 pinout, SMBJ40CAHE3/52 application, or SMBJ40CAHE3/52 equivalent, key selection criteria include bidirectional clamping capability, 40 V reverse stand-off rating, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) specified at 44.4–49.1 V (min/max) under 1 mA test current. Its low clamping ratio (VC/VWM ≈ 1.61) ensures effective overvoltage suppression while maintaining safe margin below protected device absolute maximum ratings.
The device uses a glass-passivated silicon junction, supports repetitive surge duty cycle ≤ 0.01 %, and meets MSL Level 1 per J-STD-020 with peak reflow temperature up to 260 °C. Junction temperature range spans −55 °C to +150 °C, enabling deployment in under-hood automotive and industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe operating window for protected circuitry. |
| VBR (min/max) | 44.4 V / 49.1 V at IT = 1 mA - Confirmed breakdown threshold range ensuring reliable turn-on during transients. |
| VC @ IPPM | 64.5 V at 9.3 A (10/1000 µs) - Clamped voltage seen by downstream components during worst-case surge event. |
| PPPM | 600 W - Peak transient power handling capacity; determines survivability against lightning-induced or inductive-switching surges. |
| IPPM | 9.3 A - Maximum non-repetitive surge current supported; used with PCB pad thermal design (0.2" × 0.2") for derating. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance; informs heatsinking requirements and ambient temperature limits. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking - symmetrical anode/cathode terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | Accepts reverse surge current during negative-going transients; electrically identical to cathode in bidirectional operation. |
| Cathode | Transient current entry (positive polarity) | Accepts reverse surge current during positive-going transients; functionally interchangeable with anode due to symmetry. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns. |
| 600 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge immunity when properly laid out. |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive powertrain, body control, and ADAS modules requiring extended temperature and life-cycle reliability. |
| MSL Level 1, 260 °C peak reflow | Compatible with standard lead-free SMT assembly processes without moisture sensitivity handling. |
| Glass-passivated junction | Ensures stable VBR tolerance and long-term leakage performance under thermal stress and humidity. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load-dump and alternator ripple transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed at input filter stage to clamp ±100 V spikes within 1 ns response time. Use Value: Prevents latch-up or gate oxide damage in downstream DC-DC controllers and microcontrollers rated to 45 V max. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) in factory automation systems from EMI and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance (< 100 pF) shunt protector on differential signal pairs upstream of ADC front-end. Use Value: Maintains signal integrity while limiting transient-induced offset errors beyond ±1 LSB at 16-bit resolution. |
| Telecom Data Line Surge Suppression | Consumer USB Port ESD Hardening |
|
Use Scenario: Safeguarding RS-485 transceivers in outdoor base stations exposed to induced lightning surges. IC Role / Device Role / Timing Role: Primary-level TVS on bus lines, coordinated with secondary GDT or polymer PTC for multi-stage protection. Use Value: Limits clamped voltage to < 70 V, staying below RS-485 receiver common-mode range (−7 V to +12 V) during surge recovery. |
Use Scenario: Reinforcing ESD robustness of USB 2.0 data lines (D+/D−) in portable audio devices. IC Role / Device Role / Timing Role: Secondary-level TVS after internal ESD diodes, absorbing > 30 A contact discharge per IEC 61000-4-2 Level 4. Use Value: Reduces system-level failure rate from > 10⁻³ to < 10⁻⁶ per 10k insertions by lowering post-clamp residual energy. |
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-M3/52 | Halogen-free, RoHS-compliant, commercial-grade (non-AEC-Q101). | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated. | Select when cost sensitivity outweighs automotive reliability requirements and no temperature cycling validation is needed. |
| SAC40CA-TB-E3 | Same VWM/VC specs but in SMC (DO-214AB) package; higher IPPM (12.5 A) and lower RθJA (60 °C/W). | Requires larger PCB footprint; better suited for high-surge industrial motor drives with limited airflow. | Choose when thermal budget is constrained and layout space allows SMC's 7.11 mm × 6.22 mm outline. |
Compared with SMBJ40CAHE3/52, the M3/52 variant trades automotive qualification for halogen-free compliance, while SAC40CA-TB-E3 offers superior thermal performance and surge margin at the cost of board area - making SMBJ40CAHE3/52 optimal for space-constrained AEC-Q101-compliant automotive modules.
Availability
SMBJ40CAHE3/52 is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and telecom infrastructure requiring stable component supply with AEC-Q101 assurance and consistent tape-and-reel delivery.
Supply support for SMBJ40CAHE3/52 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 SMBJ series delivers standardized TVS performance in compact SMB packages, engineered for high-volume automotive and industrial surge protection where AEC-Q101 compliance, low clamping voltage, and automated assembly compatibility are critical.
FAQ
What does the "CA" suffix indicate in SMBJ40CAHE3/52?
The "CA" suffix denotes a bidirectional configuration - meaning SMBJ40CAHE3/52 provides symmetrical clamping for both positive and negative voltage transients without polarity dependence. This differs from unidirectional "A" variants (e.g., SMBJ40AHE3/52), which require correct cathode orientation and only suppress one polarity. The CA version is ideal for AC signal lines or floating buses where transient polarity is unpredictable.
Is SMBJ40CAHE3/52 suitable for IEC 61000-4-5 surge testing?
Yes, SMBJ40CAHE3/52 supports IEC 61000-4-5 Level 3 (1 kV line-to-earth, 2 Ω source impedance) when implemented with recommended 5.0 mm × 5.0 mm copper pads per terminal and proper PCB layout. Its 64.5 V clamping voltage at 9.3 A ensures protected ICs remain within safe operating area during the 10/1000 µs surge waveform, provided series impedance limits peak current to within rated IPPM.
How does the HE3 suffix affect SMBJ40CAHE3/52's qualification status?
The HE3 suffix confirms SMBJ40CAHE3/52 is RoHS-compliant and AEC-Q101 qualified - validated across temperature cycling, high-temperature reverse bias (HTRB), and ESD tests per automotive reliability standards. This distinguishes it from E3 (commercial RoHS) or M3 (halogen-free commercial) variants, making SMBJ40CAHE3/52 appropriate for under-hood and safety-critical vehicle subsystems.
What is the maximum operating temperature for SMBJ40CAHE3/52?
SMBJ40CAHE3/52 has a maximum junction temperature (TJ) of +150 °C and operates from −55 °C to +150 °C. At ambient temperatures above 25 °C, derating applies: power dissipation decreases linearly per Fig. 2 in the datasheet, reaching zero at ~75 °C ambient when mounted on standard 0.2" × 0.2" pads. Thermal design must account for RθJA = 100 °C/W to avoid exceeding TJmax.
Can SMBJ40CAHE3/52 replace SMBJ40AHE3/52 in an existing design?
No - SMBJ40CAHE3/52 is bidirectional while SMBJ40AHE3/52 is unidirectional; direct substitution risks improper clamping if polarity is not verified. Unidirectional types require cathode connection toward the protected IC's supply rail, whereas SMBJ40CAHE3/52 connects symmetrically. Layout changes and functional validation are required before replacement, especially in DC-biased circuits where reverse conduction could cause latch-up.
SMBJ40CAHE3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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 (SMBJ)
SMBJ40CAHE3/52 FAQ
1.How can I place an order for SMBJ40CAHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40CAHE3/52 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 SMBJ40CAHE3/52 reliable?
The price and inventory of SMBJ40CAHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ40CAHE3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ40CAHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40CAHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40CAHE3/52?
SMBJ40CAHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40CAHE3/52 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 SMBJ40CAHE3/52?
For technical support, including SMBJ40CAHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40CAHE3/52 requirements.
6.How does Aetrix verify that SMBJ40CAHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ40CAHE3/52 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 SMBJ40CAHE3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ40CAHE3/52?
All SMBJ40CAHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40CAHE3/52, 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 SMBJ40CAHE3/52 part is unused and in its original packaging.
Return procedure for SMBJ40CAHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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