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Vishay General Semiconductor - Diodes Division SMBJ40CAHM3_B/I
- Part No.:
- SMBJ40CAHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40CAHM3_B/I.pdf
- Description:
- 600W,40V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:9,917
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Product details
Overview
SMBJ40CAHM3_B/I from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 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 - deployed in industrial sensor signal lines, automotive ECUs, and telecom interface circuits.
For engineers reviewing the SMBJ40CAHM3_B/I datasheet, SMBJ40CAHM3_B/I pinout, SMBJ40CAHM3_B/I application, or SMBJ40CAHM3_B/I equivalent, key selection criteria include bidirectional clamping symmetry, low thermal resistance (RθJL = 20 °C/W), AEC-Q101 qualification status, and halogen-free RoHS compliance per Vishay HM3 suffix - critical for automotive-grade ESD/surge resilience in harsh environments.
Technical Context
This device operates as a voltage-clamped shunt protector: under transient overvoltage exceeding its breakdown threshold (VBR min = 44.4 V, max = 49.1 V at 1 mA), it avalanches rapidly (<1 ns response) to divert surge current away from downstream ICs. Its bidirectional architecture ensures symmetrical clamping in both polarities, eliminating polarity dependency in AC-coupled or floating signal paths.
Thermally, it sustains repetitive surges up to 150 °C junction temperature (TJ max), with derated IPPM above 25 °C ambient per Fig. 2. The 20 °C/W junction-to-lead thermal resistance enables effective heat dissipation into PCB copper pads (0.2" × 0.2"), supporting reliable operation without external heatsinking in space-constrained designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before significant leakage; defines safe signal swing margin in protected circuit. |
| VBR (min/max) | 44.4 V / 49.1 V at 1 mA - Breakdown onset range; determines earliest clamping activation point under transients. |
| VC @ IPPM | 64.5 V at 9.3 A - Clamped voltage during 10/1000 µs surge; directly limits stress on downstream components. |
| PPPM | 600 W - Peak transient energy handling capacity; supports IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly laid out. |
| ID @ VWM | 1.0 µA - Reverse leakage at stand-off voltage; ensures minimal DC loading on high-impedance sensor or data lines. |
| TJ max | +150 °C - Maximum junction temperature; enables deployment in under-hood automotive or industrial enclosures. |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.59 mm × 4.06 mm footprint; compatible with automated pick-and-place and reflow. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, MSL Level 1 (JEDEC J-STD-020), 260 °C peak reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; cathode-side reference in unidirectional mode | For bidirectional SMBJ40CAHM3_B/I, anode and cathode are functionally symmetric - no polarity marking; terminals serve as dual-direction surge current entry/exit points. |
| Cathode | Current exit terminal in forward bias; anode-side reference in unidirectional mode | Identical electrical role to Anode in bidirectional configuration; both terminals clamp equally for positive or negative transients. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485), or floating grounds without polarity concerns. |
| 600 W peak pulse power (10/1000 µs) | Meets IEC 61000-4-5 surge immunity requirements for industrial and automotive applications with minimal layout overhead. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive use including engine control units, body electronics, and ADAS sensor interfaces per stress test standards. |
| Halogen-free & RoHS-compliant | Fulfills environmental compliance mandates (IEC 61249-2-21) for global OEM supply chains without compromising surge performance. |
| Low RθJL = 20 °C/W | Enables efficient heat transfer to PCB copper pads, sustaining repetitive surge events without thermal runaway in compact layouts. |
Applications
| Automotive Sensor Protection | Industrial RS-485 Interface |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed across signal/power pins to clamp voltage excursions below IC absolute maximum ratings. Use Value: Prevents latch-up or permanent damage to 5 V/3.3 V microcontrollers and analog front-ends during 12 V/24 V system transients. |
Use Scenario: Safeguarding RS-485 transceivers (e.g., THVD1550) against ESD (IEC 61000-4-2) and surge (IEC 61000-4-5) in factory automation PLCs. IC Role / Device Role / Timing Role: Bidirectional clamping device connected between differential pair (A/B) and ground to suppress common-mode and differential-mode surges. Use Value: Maintains signal integrity by limiting clamped voltage to ≤64.5 V, ensuring transceiver survival during 4 kV surge events without data corruption. |
| Telecom Power Input Stage | Consumer USB-C Port Protection |
|
Use Scenario: Front-end protection of 48 V PoE-powered equipment (e.g., IP cameras, wireless APs) against lightning-induced surges on DC input lines. IC Role / Device Role / Timing Role: Primary shunt TVS placed between +48 V rail and chassis ground to absorb fast-rising transients before they reach DC/DC converters. Use Value: Withstands 600 W peak pulses and 150 °C operation, enabling reliable field deployment in outdoor telecom infrastructure. |
Use Scenario: Secondary-level protection on USB-C VBUS and CC lines in portable devices against hot-plug ESD and cable-bend induced transients. IC Role / Device Role / Timing Role: Low-capacitance bidirectional suppressor (CJ ≈ 100 pF at 0 V) minimizing signal distortion while clamping ±15 kV contact ESD. Use Value: Halogen-free HM3 construction meets consumer brand sustainability requirements without sacrificing clamping speed or voltage accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40CAHE3_B/I | Same electrical specs, but RoHS-compliant (E3) without halogen-free certification; not AEC-Q101 qualified. | Suitable for commercial/industrial use only; excluded from automotive production due to missing AEC-Q101 validation. | Select SMBJ40CAHE3_B/I only if halogen-free requirement is waived and automotive qualification is unnecessary. |
| SMAJ40CAHM3 | Lower PPPM (400 W vs. 600 W); same VWM/VBR/VC; SMA package (smaller footprint, higher RθJA = 150 °C/W). | Limited to lower-energy transients; less thermal margin in high-repetition-rate environments or elevated ambient temperatures. | Choose SMAJ40CAHM3 only when board space is critical and surge threat level is ≤IEC 61000-4-5 Level 2 (1 kV). |
Compared with SMBJ40CAHE3_B/I, SMBJ40CAHM3_B/I adds AEC-Q101 qualification and halogen-free compliance for automotive use; compared with SMAJ40CAHM3, it delivers 50 % higher surge power handling and superior thermal performance in the larger SMB package - making it the optimal choice for mission-critical, high-energy transient environments.
Availability
SMBJ40CAHM3_B/I is available at Aetrix Electronics and suitable for automotive ECU design, industrial RS-485 network nodes, and telecom power input protection requiring stable component supply across multi-year production cycles.
Supply support for SMBJ40CAHM3_B/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 is engineered for high-energy transient suppression in automotive, industrial, and telecom systems - delivering consistent clamping behavior, AEC-Q101 validation, and robust thermal design for real-world surge environments.
FAQ
What is the clamping voltage of SMBJ40CAHM3_B/I at its rated peak pulse current?
The SMBJ40CAHM3_B/I has a maximum clamping voltage (VC) of 64.5 V at its specified peak pulse current (IPPM) of 9.3 A, measured using the standard 10/1000 µs double-exponential surge waveform. This value ensures downstream ICs experience voltage stress below their absolute maximum ratings during transient events, and is confirmed in Vishay's datasheet Document Number 88392, page 2.
Is SMBJ40CAHM3_B/I qualified for automotive applications?
Yes, SMBJ40CAHM3_B/I is AEC-Q101 qualified, as indicated by the "HM3" suffix and explicitly stated in the ordering information table (page 3) of Vishay's SMBJ5.0A–SMBJ188A datasheet. This qualification covers stress tests including high-temperature operating life, temperature cycling, and ESD - validating its suitability for under-hood and cabin electronics in production vehicles.
Does SMBJ40CAHM3_B/I have polarity markings on the package?
No, SMBJ40CAHM3_B/I does not feature polarity markings because it is a bidirectional TVS diode. As confirmed in the "Mechanical Data" section (page 1), bidirectional types have no band or marking - both terminals behave identically for positive and negative transients, simplifying placement in AC-coupled or floating circuits.
What is the thermal resistance from junction to lead (RθJL) for SMBJ40CAHM3_B/I?
The SMBJ40CAHM3_B/I has a typical junction-to-lead thermal resistance (RθJL) of 20 °C/W, per the "Thermal Characteristics" table on page 3 of the Vishay datasheet. This low value enables efficient heat conduction from the silicon die into the PCB copper pads, supporting reliable operation during repetitive surge events without external heatsinking.
How does the halogen-free status of SMBJ40CAHM3_B/I impact compliance?
The "HM3" suffix in SMBJ40CAHM3_B/I certifies it as halogen-free and RoHS-compliant per IEC 61249-2-21, satisfying strict environmental requirements for automotive OEMs and consumer brands. Unlike E3-suffix variants, HM3 parts contain no brominated or chlorinated flame retardants - verified through material testing and documented in Vishay's compliance reports.
SMBJ40CAHM3_B/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:
- 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:
- 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_B/I FAQ
1.How can I place an order for SMBJ40CAHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40CAHM3_B/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_B/I reliable?
The price and inventory of SMBJ40CAHM3_B/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_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ40CAHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40CAHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40CAHM3_B/I?
SMBJ40CAHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40CAHM3_B/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_B/I?
For technical support, including SMBJ40CAHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40CAHM3_B/I requirements.
6.How does Aetrix verify that SMBJ40CAHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ40CAHM3_B/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_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ40CAHM3_B/I?
All SMBJ40CAHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40CAHM3_B/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_B/I part is unused and in its original packaging.
Return procedure for SMBJ40CAHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ40CAHM3_B/I Tags
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