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Vishay General Semiconductor - Diodes Division SMBJ40CAHM3_A/H
- Part No.:
- SMBJ40CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40CAHM3_A/H.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,078
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Product details
Overview
SMBJ40CAHM3_A/H 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 on power rails and signal lines in industrial sensor interfaces and telecom front-ends.
For engineers reviewing the SMBJ40CAHM3_A/H datasheet, SMBJ40CAHM3_A/H pinout, SMBJ40CAHM3_A/H application, or SMBJ40CAHM3_A/H equivalent, this device is evaluated for bidirectional surge suppression in 24–48 V DC systems, ESD-prone I/O paths, and automotive-grade industrial controllers 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 low clamping ratio (VC/VWM ≈ 1.61) ensures effective voltage limiting during transients while maintaining system-level reliability under repetitive surge conditions (0.01% duty cycle).
The device uses a glass-passivated silicon junction and achieves thermal resistance of 100 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads. It meets MSL Level 1 per J-STD-020 and supports peak forward surge current up to 100 A (8.3 ms half-sine) in unidirectional mode - though SMBJ40CAHM3_A/H itself is bidirectional and thus lacks polarity marking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 40 V - maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 44.4 V to 49.1 V at 1 mA - guaranteed conduction onset range; ensures predictable turn-on during fast transients |
| VC (Clamping Voltage) | 64.5 V at IPPM = 9.3 A (10/1000 µs) - limits downstream voltage stress to safe levels for 24–48 V logic and interface ICs |
| PPPM (Peak Pulse Power) | 600 W - sustains high-energy surges (e.g., ISO 7637-2 Pulse 1/2a/5a) without failure when mounted per recommended pad layout |
| ID (Max Reverse Leakage) | 1.0 µA at VWM - negligible standby current; avoids loading low-power sensor bias networks or battery-backed circuits |
| TJ max. | 150 °C - enables operation in under-hood or enclosed industrial enclosures without derating at full power |
| Package | SMB (DO-214AA) - standardized SMT footprint compatible with automated placement; 5.59 mm × 4.06 mm × 2.20 mm body |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration - no cathode/anode marking; symmetrical terminal design.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode / Cathode (bidirectional) | Either terminal serves as anode or cathode depending on transient polarity; no polarity dependency in circuit layout |
| Terminal 2 | Anode / Cathode (bidirectional) | Electrically identical to Terminal 1; device functions identically regardless of orientation on PCB |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional suppression | Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-485, CAN, Ethernet PHY) without polarity concerns |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Combination Wave (10/700 µs) surges up to 1 kV line-to-ground when properly decoupled |
| AEC-Q101 qualified | Validated for automotive powertrain and body electronics applications requiring extended temperature cycling and humidity exposure |
| Halogen-free & RoHS-compliant | Meets IPC-1752A material declaration requirements and EU Directive 2011/65/EU for environmentally constrained supply chains |
| MSL Level 1 rating | Allows unlimited floor life and reflow at peak 260 °C without preconditioning - simplifies manufacturing for high-mix production |
Applications
| Industrial Sensor Interface | Telecom Line Card Protection |
|---|---|
|
Use Scenario: Protecting 4–20 mA current-loop transmitters and analog sensor outputs against ESD and inductive switching spikes in factory automation PLC modules. IC Role / Device Role / Timing Role: Bidirectional TVS placed across signal and return lines upstream of precision ADC drivers and op-amps. Use Value: Clamps transients to ≤64.5 V, preserving integrity of 24 V rail and preventing latch-up in 3.3 V/5 V signal conditioning ICs. |
Use Scenario: Safeguarding RJ-45 Ethernet PHY ports and PoE-powered line cards from lightning-induced surges and hot-plug transients. IC Role / Device Role / Timing Role: Primary differential-mode surge clamp on twisted-pair data lanes, paired with common-mode chokes. Use Value: Limits voltage excursion within IEEE 802.3af/at tolerance windows, avoiding PHY reset or magnetics saturation during 10/700 µs events. |
| Automotive Body Control Module | DC Power Rail Protection |
|
Use Scenario: Securing LIN bus nodes and LED driver inputs in door modules and lighting control units exposed to load-dump and jump-start conditions. IC Role / Device Role / Timing Role: Secondary protection stage after primary fuse and LC filter, directly at microcontroller GPIO or transceiver pins. Use Value: AEC-Q101 qualification ensures survival through -40 °C to +125 °C thermal cycling and 1000-hour HAST testing per automotive reliability standards. |
Use Scenario: Guarding 48 V intermediate bus rails in server PSUs and industrial DC-DC converters against cross-talk and back-EMF from adjacent switching stages. IC Role / Device Role / Timing Role: Parallel-connected TVS across input capacitor terminals to absorb residual energy not filtered by bulk capacitance. Use Value: 600 W PPPM rating handles repetitive 50–100 ns ringing bursts from synchronous rectifier switching without degradation. |
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_A/H | Same electrical specs and SMB package, but RoHS-compliant commercial grade (not halogen-free); no AEC-Q101 qualification | Suitable for non-automotive industrial or consumer applications where halogen-free mandate or automotive qualification is not required | Select SMBJ40CAHE3_A/H when cost sensitivity outweighs halogen-free or AEC-Q101 requirements |
| SMAJ40CA | Lower PPPM (400 W vs. 600 W); SMA (DO-214AC) package with smaller footprint (4.57 mm × 2.79 mm) and higher RθJA (150 °C/W) | Acceptable for lower-energy transients (e.g., IEC 61000-4-2 ESD only) in space-constrained designs where thermal margin permits | Choose SMAJ40CA only if board area is critical and surge threat level is limited to Class 3 ESD or low-duty-cycle switching noise |
Compared with SMBJ40CAHE3_A/H, SMBJ40CAHM3_A/H adds halogen-free construction and AEC-Q101 qualification without sacrificing clamping performance; versus SMAJ40CA, it delivers 50% higher surge power handling and superior thermal dissipation in the same functional role.
Availability
SMBJ40CAHM3_A/H is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line card protection, and automotive body control modules requiring stable component supply with halogen-free and AEC-Q101-compliant assurance.
Supply support for SMBJ40CAHM3_A/H 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 targets high-reliability transient suppression in harsh environments - engineered for automotive, industrial, and telecom infrastructure where consistent clamping behavior and long-term stability under surge stress are mandatory.
FAQ
What does the "CA" suffix indicate in SMBJ40CAHM3_A/H?
The "CA" suffix denotes a bidirectional configuration: SMBJ40CAHM3_A/H conducts symmetrically in both directions, making it ideal for protecting AC-coupled or floating signal lines such as RS-485, CAN, or Ethernet PHY pairs. Unlike unidirectional variants (e.g., SMBJ40AHM3_A/H), SMBJ40CAHM3_A/H has no polarity marking and requires no orientation during placement.
Is SMBJ40CAHM3_A/H suitable for automotive applications?
Yes - SMBJ40CAHM3_A/H is AEC-Q101 qualified and built with halogen-free, RoHS-compliant materials. It is rated for operation from -55 °C to +150 °C and validated for thermal cycling, humidity, and mechanical shock per automotive reliability standards, making SMBJ40CAHM3_A/H appropriate for body electronics, lighting control, and infotainment power domains.
How does the clamping voltage of SMBJ40CAHM3_A/H compare to its stand-off voltage?
SMBJ40CAHM3_A/H has a 40 V stand-off voltage (VWM) and clamps to a maximum of 64.5 V at 9.3 A (10/1000 µs). This 61% overvoltage margin ensures protected ICs see no more than 64.5 V during surge events, well within the absolute maximum ratings of most 75 V-tolerant interface ICs and MOSFETs used in 48 V systems.
What is the thermal resistance of SMBJ40CAHM3_A/H, and how does it affect layout?
SMBJ40CAHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. To maintain reliability under repetitive surges, PCB layout must follow Vishay's recommended pad dimensions (5.0 mm × 5.0 mm) - undersized pads increase junction temperature and reduce surge endurance of SMBJ40CAHM3_A/H.
Can SMBJ40CAHM3_A/H replace unidirectional TVS diodes in existing designs?
No - SMBJ40CAHM3_A/H is strictly bidirectional and cannot substitute for unidirectional TVS diodes (e.g., SMBJ40AHM3_A/H) in DC-biased circuits like power supply inputs, where reverse polarity blocking is required. Using SMBJ40CAHM3_A/H in such locations may cause unintended conduction; always verify circuit topology before substitution.
SMBJ40CAHM3_A/H 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/H FAQ
1.How can I place an order for SMBJ40CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40CAHM3_A/H 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/H reliable?
The price and inventory of SMBJ40CAHM3_A/H 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/H is usually 5 days.
3.What payment methods are accepted for SMBJ40CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40CAHM3_A/H?
SMBJ40CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40CAHM3_A/H 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/H?
For technical support, including SMBJ40CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40CAHM3_A/H requirements.
6.How does Aetrix verify that SMBJ40CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ40CAHM3_A/H 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/H meets industry standards.
7.What is the process for return or replacement of SMBJ40CAHM3_A/H?
All SMBJ40CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40CAHM3_A/H, 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/H part is unused and in its original packaging.
Return procedure for SMBJ40CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ40CAHM3_A/H Tags
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