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Vishay General Semiconductor - Diodes Division SMBJ40CAHE3_A/I
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- Part No.:
- SMBJ40CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40CAHE3_A/I.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,606
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Product details
Overview
SMBJ40CAHE3_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 standoff 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 motor drives and telecom power supplies.
For engineers reviewing the SMBJ40CAHE3_A/I datasheet, SMBJ40CAHE3_A/I pinout, SMBJ40CAHE3_A/I application, or SMBJ40CAHE3_A/I equivalent, this device is evaluated for bidirectional surge suppression in DC power rails, automotive body electronics, and Ethernet PHY protection where low clamping voltage and AEC-Q101 qualification are critical selection criteria.
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 (RθJA = 100 °C/W) reflects performance on 0.2" × 0.2" copper pads.
The SMBJ40CAHE3_A/I variant is RoHS-compliant and AEC-Q101 qualified, indicated by the "HE3" suffix and revision code "A/I". It exhibits low incremental surge resistance and fast response time (<1 ns), enabling effective suppression of ESD, lightning-induced surges, and inductive switching transients without affecting normal circuit operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 48 V systems. |
| VBR min/max | 44.4 V / 49.1 V at 1 mA - ensures reliable conduction onset within tight tolerance for predictable transient threshold. |
| VC @ IPPM | 64.5 V at 9.3 A - limits peak voltage seen by downstream components during 600 W surge events. |
| PPPM | 600 W - peak pulse power handling per 10/1000 µs waveform; supports IEC 61000-4-5 Level 3/4 surge immunity. |
| ID @ VWM | 1.0 µA - ultra-low leakage at rated standoff, minimizing standby power loss in battery-backed circuits. |
| TJ max | +150 °C - enables operation in under-hood automotive and high-temperature industrial environments. |
| Package | SMB (DO-214AA) - surface-mount footprint compatible with automated assembly; 5.59 mm × 4.06 mm outline. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, MSL Level 1 (260 °C reflow peak), UL 94 V-0 rated compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Anode) | Bidirectional terminal pair | No polarity marking; symmetrical terminals allow connection across any two-point voltage node without orientation concern. |
| Anode (Cathode) | Bidirectional terminal pair | Identical electrical role to opposite terminal; forms non-polarized clamping path between protected nodes. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including body control modules and infotainment power rails. |
| 600 W peak pulse power | Withstands repeated 10/1000 µs surges up to 600 W at 0.01% duty cycle - meets IEC 61000-4-5 requirements. |
| Low clamping voltage (64.5 V) | Minimizes stress on 75 V-rated downstream MOSFETs and controllers during transient events. |
| Fast response time (<1 ns) | Clamps transients before sensitive logic or analog circuitry experiences overvoltage damage. |
| MSL Level 1 rating | Enables standard SMT reflow without moisture sensitivity concerns or baking requirements. |
Applications
| Industrial Motor Drives | Automotive Body Electronics |
|---|---|
|
Use Scenario: Protection of gate drivers and MCU I/O against back-EMF spikes from brushed DC motors and solenoid loads. IC Role / Device Role / Timing Role: Bidirectional TVS placed across H-bridge supply rails and signal lines to clamp inductive kickback. Use Value: Prevents latch-up and permanent damage to 3.3 V/5 V microcontrollers and half-bridge drivers during load dump or switch-off events. |
Use Scenario: Surge suppression on LIN bus lines and door module power inputs exposed to battery transients. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected between VBAT and GND or LIN data line and ground. Use Value: Maintains communication integrity during ISO 7637-2 Pulse 1/2a/5a events while meeting AEC-Q101 reliability requirements. |
| Telecom Power Supplies | Industrial Sensor Interfaces |
|
Use Scenario: Input-stage protection for 48 V DC-DC converters in base station power distribution units. IC Role / Device Role / Timing Role: Primary-level TVS on secondary-side output rails to absorb coupled lightning surges. Use Value: Limits voltage overshoot to ≤64.5 V during 600 W surges, preserving 75 V input-rated DC-DC controllers and FETs. |
Use Scenario: Protection of analog front-ends and RS-485 transceivers in factory automation sensors. IC Role / Device Role / Timing Role: Bidirectional clamping element across differential signal pairs and supply-to-ground paths. Use Value: Enables robust operation in noisy EMI environments with sub-1 ns response and <1 µA leakage at 40 V. |
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-M3/5B | Halogen-free, RoHS-compliant, commercial-grade (non-AEC-Q101). | Lacks automotive qualification; suitable for industrial/commercial power supplies where AEC-Q101 is not mandated. | Select when cost-sensitive designs require halogen-free compliance but do not need automotive reliability validation. |
| SMCJ40CAHE3_A/I | Same electrical specs but in larger SMC (DO-214AB) package; higher thermal mass and RθJA = 50 °C/W. | Better suited for higher average power dissipation or extended surge repetition; requires larger PCB area. | Choose when thermal derating or repetitive surge duty exceeds SMBJ40CAHE3_A/I capability, and board space permits SMC footprint. |
Compared with SMBJ40CAHE3_A/I, the SMBJ40CA-M3/5B offers identical clamping performance without automotive qualification, while the SMCJ40CAHE3_A/I provides superior thermal handling at the cost of increased board area - enabling trade-offs between reliability, footprint, and qualification scope.
Availability
SMBJ40CAHE3_A/I is available at Aetrix Electronics and suitable for industrial motor drives, automotive body electronics, and telecom power supplies requiring stable component supply with AEC-Q101 assurance and long-term production continuity.
Supply support for SMBJ40CAHE3_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, rectifiers, MOSFETs, and protection devices with emphasis on reliability and application-specific optimization.
The SMBJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where precise clamping, low leakage, and qualification-grade consistency are essential.
FAQ
What does the 'CA' suffix indicate in SMBJ40CAHE3_A/I?
The 'CA' suffix denotes a bidirectional configuration, meaning SMBJ40CAHE3_A/I provides symmetrical clamping in both forward and reverse directions. This eliminates polarity concerns during placement and enables use across AC-coupled lines or ungrounded signal paths - unlike unidirectional variants such as SMBJ40AHE3_A/I, which require cathode alignment.
Is SMBJ40CAHE3_A/I suitable for protecting 48 V DC power rails?
Yes, SMBJ40CAHE3_A/I is specifically designed for 48 V system protection: its 40 V standoff voltage (VWM) provides adequate margin below nominal 48 V, while its 64.5 V clamping voltage ensures downstream 75 V-rated components remain within safe operating limits during 600 W transients.
How does the HE3 suffix affect SMBJ40CAHE3_A/I's qualification status?
The HE3 suffix confirms SMBJ40CAHE3_A/I is RoHS-compliant and AEC-Q101 qualified - verified for automotive-grade reliability including temperature cycling, humidity testing, and surge endurance. This distinguishes it from E3 (commercial RoHS) or M3 (halogen-free commercial) variants that lack automotive validation.
What is the maximum junction temperature rating for SMBJ40CAHE3_A/I?
SMBJ40CAHE3_A/I has a maximum junction temperature (TJ max) of +150 °C, allowing operation in high-ambient environments such as engine compartments or enclosed industrial enclosures. Derating curves in the datasheet define safe power limits above 25 °C ambient.
Does SMBJ40CAHE3_A/I require orientation during PCB placement?
No - SMBJ40CAHE3_A/I is a bidirectional device with no polarity marking on the SMB package. Both terminals are functionally identical, enabling placement without regard to orientation, simplifying automated assembly and reducing risk of misplacement errors.
SMBJ40CAHE3_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:
- -
- 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_A/I FAQ
1.How can I place an order for SMBJ40CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40CAHE3_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 SMBJ40CAHE3_A/I reliable?
The price and inventory of SMBJ40CAHE3_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 SMBJ40CAHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ40CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40CAHE3_A/I?
SMBJ40CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40CAHE3_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 SMBJ40CAHE3_A/I?
For technical support, including SMBJ40CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40CAHE3_A/I requirements.
6.How does Aetrix verify that SMBJ40CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ40CAHE3_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 SMBJ40CAHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ40CAHE3_A/I?
All SMBJ40CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40CAHE3_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 SMBJ40CAHE3_A/I part is unused and in its original packaging.
Return procedure for SMBJ40CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ40CAHE3_A/I Tags
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