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Vishay General Semiconductor - Diodes Division SMBJ40CAHM3_A/I
- Part No.:
- SMBJ40CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40CAHM3_A/I.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,339
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Product details
Overview
SMBJ40CAHM3_A/I 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 40 V stand-off voltage (VWM), 64.5 V maximum clamping voltage (VC) at 9.3 A peak pulse current (IPPM), and 600 W peak pulse power (PPPM) with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies and telecom line cards.
For engineers reviewing the SMBJ40CAHM3_A/I datasheet, SMBJ40CAHM3_A/I pinout, SMBJ40CAHM3_A/I application, or SMBJ40CAHM3_A/I equivalent, this device is evaluated for bidirectional surge protection in DC power rails, low-voltage data lines, and automotive body electronics where AEC-Q101 qualification and halogen-free compliance are required.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) ranging from 44.4 V to 49.1 V at 1 mA test current. Its clamping behavior is defined under standardized 10/1000 µs surge conditions, and thermal resistance is characterized at RθJA = 100 °C/W on 0.2" × 0.2" copper pads.
The SMBJ40CAHM3_A/I uses a glass-passivated silicon junction and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. It is halogen-free and RoHS-compliant (HM3 suffix), and qualified to AEC-Q101 for automotive-grade reliability - distinguishing it from commercial-grade E3/M3 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min / max | 44.4 V / 49.1 V at IT = 1 mA - ensures reliable turn-on within specified tolerance band |
| VC @ IPPM | 64.5 V at 9.3 A - limits downstream voltage stress during 10/1000 µs transients |
| PPPM | 600 W - peak surge energy handling capability under standard lightning-surge waveform |
| ID @ VWM | 1.0 µA - ultra-low leakage preserves efficiency in high-impedance bias networks |
| TJ max | +150 °C - supports operation in under-hood automotive and industrial ambient environments |
| Package | SMB (DO-214AA) - surface-mount footprint compatible with automated assembly and IPC-7351B land patterns |
Pinout & Package
Two-terminal bidirectional device in SMB (DO-214AA) package: no polarity marking; symmetrical terminals function as interchangeable anode/cathode pair depending on transient polarity. Mounting uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Interchangeable terminal; conducts during positive or negative overvoltage events |
| Terminal 2 | Anode/Cathode (bidirectional) | Interchangeable terminal; completes symmetrical clamping path across both polarities |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity constraints |
| AEC-Q101 qualification | Validated for automotive body electronics, infotainment power rails, and gateway modules |
| Halogen-free & RoHS-compliant (HM3) | Meets IEC 61249-2-21 and JEDEC J-STD-20E environmental compliance requirements |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) in properly decoupled circuits |
| MSL Level 1 rating | Allows unlimited floor life and single-reflow processing at 260 °C peak without moisture sensitivity concerns |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protects 48 V DC input stage of programmable logic controller (PLC) power module against load dump and inductive switching transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed across input bulk capacitor to clamp ±100 V spikes within 1 ns response time. Use Value: Limits voltage excursion to ≤64.5 V, preventing damage to upstream rectifier and downstream buck controller (e.g., LM5164). |
Use Scenario: Shields LIN bus transceiver (e.g., TLE7250) from battery voltage reversals and jump-start surges in door module ECUs. IC Role / Device Role / Timing Role: Placed between LIN line and ground to suppress bidirectional transients up to 600 W without polarity dependency. Use Value: Maintains signal integrity below 12 V threshold while surviving 10/1000 µs pulses per ISO 7637-2 Pulse 5a. |
| Telecom Line Card Interface | Consumer Sensor Hub Protection |
|
Use Scenario: Guards RS-485 transceiver (e.g., SN65HVD72) on base station backplane against EFT and lightning-induced surges. IC Role / Device Role / Timing Role: Connected line-to-ground on differential pair to provide symmetrical clamping without skewing common-mode range. Use Value: Clamps transients to 64.5 V while adding <1 pF junction capacitance - preserving >20 Mbps data rate integrity. |
Use Scenario: Safeguards I²C lines of MEMS accelerometer (e.g., ADXL345) in smart home hub against ESD events from user interface connectors. IC Role / Device Role / Timing Role: Low-leakage (1.0 µA) bidirectional TVS placed on SDA/SCL lines to prevent latch-up during ±8 kV HBM ESD strikes. Use Value: Enables robust operation at 3.3 V logic levels with no false triggering due to sub-µA reverse leakage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40CAHE3_A/I | Same electrical specs but RoHS-compliant only (not halogen-free); lacks AEC-Q101 qualification | Restricted to commercial-grade industrial and consumer applications; not approved for automotive use | Select when halogen-free requirement is absent and automotive qualification is unnecessary |
| SMAJ40CAHM3_A/I | Lower PPPM (400 W vs. 600 W); same VWM, VC, and package outline but smaller SMA (DO-214AC) footprint | Insufficient for IEC 61000-4-5 Level 4; suitable only for lower-energy transients in space-constrained designs | Choose only if board area is critical and surge threat level is limited to IEC 61000-4-4 EFT (±2 kV) |
Compared with SMBJ40CAHE3_A/I and SMAJ40CAHM3_A/I, the SMBJ40CAHM3_A/I uniquely combines AEC-Q101 qualification, halogen-free construction, and 600 W surge capacity - making it the sole option for automotive body electronics requiring full compliance and high-energy clamping.
Availability
SMBJ40CAHM3_A/I is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and telecom line card protection requiring stable component supply with guaranteed long-term sourcing.
Supply support for SMBJ40CAHM3_A/I 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMBJ series targets high-reliability transient suppression in automotive, industrial, and telecom infrastructure - engineered for robust clamping, low leakage, and seamless integration into automated SMT lines.
FAQ
What is the clamping voltage of SMBJ40CAHM3_A/I at its rated peak pulse current?
The SMBJ40CAHM3_A/I has a maximum clamping voltage (VC) of 64.5 V when subjected to its rated peak pulse current (IPPM) of 9.3 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ40CAHM3_A/I maintains this clamping performance across its full operating temperature range of –55 °C to +150 °C.
Is SMBJ40CAHM3_A/I suitable for automotive applications?
Yes, SMBJ40CAHM3_A/I is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction - meeting requirements for automotive body electronics, gateway modules, and infotainment power rails. Its 150 °C maximum junction temperature and validated surge performance under ISO 7637-2 Pulse 5a make SMBJ40CAHM3_A/I appropriate for under-hood and cabin-mounted ECUs where reliability under harsh thermal and electrical stress is mandatory.
How does the bidirectional configuration of SMBJ40CAHM3_A/I affect circuit placement?
The SMBJ40CAHM3_A/I has no polarity marking and functions identically in either orientation, enabling direct placement across floating or AC-coupled nodes such as RS-485 differential pairs or transformer-isolated power inputs. Unlike unidirectional TVS diodes, SMBJ40CAHM3_A/I eliminates layout constraints related to cathode/anode alignment and avoids risk of incorrect orientation during automated assembly - simplifying design and reducing BOM complexity in bidirectional protection schemes.
What is the thermal resistance of SMBJ40CAHM3_A/I, and how does it impact power dissipation?
SMBJ40CAHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value determines steady-state temperature rise under continuous power dissipation: at its rated 5.0 W power dissipation (PD), junction temperature rises ~500 °C above ambient - confirming that SMBJ40CAHM3_A/I is intended for transient-only operation, not continuous DC power handling. Its 600 W PPPM rating applies only to short-duration surges.
Does SMBJ40CAHM3_A/I meet moisture sensitivity level (MSL) requirements for lead-free reflow?
Yes, SMBJ40CAHM3_A/I meets MSL Level 1 per J-STD-020, with a maximum peak reflow temperature of 260 °C. This allows unlimited floor life and compatibility with standard lead-free soldering profiles without preconditioning or dry-pack requirements. The device's molding compound complies with UL 94 V-0 flammability rating, and its matte tin-plated leads satisfy solderability standards J-STD-002 and JESD 22-B102 - ensuring robust manufacturability in high-volume SMT lines.
SMBJ40CAHM3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ40CAHM3_A/I FAQ
1.How can I place an order for SMBJ40CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40CAHM3_A/I 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 SMBJ40CAHM3_A/I reliable?
The price and inventory of SMBJ40CAHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ40CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ40CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40CAHM3_A/I?
SMBJ40CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40CAHM3_A/I 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 SMBJ40CAHM3_A/I?
For technical support, including SMBJ40CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40CAHM3_A/I requirements.
6.How does Aetrix verify that SMBJ40CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ40CAHM3_A/I 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 SMBJ40CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ40CAHM3_A/I?
All SMBJ40CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40CAHM3_A/I, 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 SMBJ40CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMBJ40CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ40CAHM3_A/I Tags
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