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Vishay General Semiconductor - Diodes Division SMBJ40CAHM3/H
- Part No.:
- SMBJ40CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40CAHM3/H.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,380
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Product details
Overview
SMBJ40CAHM3/H 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), 600 W peak pulse power (10/1000 µs), and operates across -55 °C to +150 °C junction temperature range - deployed in industrial sensor interfaces and telecom line protection.
For engineers reviewing the SMBJ40CAHM3/H datasheet, SMBJ40CAHM3/H pinout, SMBJ40CAHM3/H application, or SMBJ40CAHM3/H equivalent, this page delivers verified electrical parameters, bidirectional clamping behavior, thermal resistance (RθJA = 100 °C/W), AEC-Q101 qualification status, and halogen-free RoHS-compliant construction per Vishay Document 88392 (Rev. 09-Jan-2024).
Technical Context
This device functions as a voltage-clamping protector with symmetrical breakdown in both directions (VBR(min) = 44.4 V, VBR(max) = 49.1 V at IT = 1 mA), enabling transient suppression on AC-coupled or floating lines without polarity concerns. Its low incremental surge resistance and fast response time (<1 ns) ensure effective suppression of ESD, lightning-induced surges, and inductive switching spikes.
Designed for surface-mount assembly on standard PCB copper pads (0.2" × 0.2"), it delivers 600 W peak pulse power under 10/1000 µs waveform with 0.01% duty cycle, and exhibits 1.0 µA max reverse leakage at VWM, supporting low-power standby integrity in battery-backed systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe operating margin for 36–40 V nominal DC rails. |
| VBR (min/max) | 44.4 V / 49.1 V at 1 mA - Confirmed bidirectional breakdown threshold; ensures reliable triggering above system overvoltage thresholds. |
| VC @ IPPM | 64.5 V at 9.3 A - Clamped voltage during 10/1000 µs surge; limits downstream IC stress to ≤64.5 V under rated transient energy. |
| PPPM | 600 W - Peak pulse power handling capability; supports robust protection against IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard pad layout; informs derating above 25 °C ambient for sustained reliability. |
| ID @ VWM | 1.0 µA max - Reverse leakage current at standoff voltage; preserves low quiescent power in always-on monitoring circuits. |
| TJ Range | -55 °C to +150 °C - Operating junction temperature range; validated for under-hood automotive and industrial environments. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, MSL Level 1 (260 °C peak reflow). Matte tin-plated leads, solderable per J-STD-002/JESD 22-B102. No polarity marking - bidirectional symmetry confirmed.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional terminal pair | Either end serves as anode or cathode depending on transient polarity; no band marking required; enables placement flexibility on AC or floating nodes. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-device compliance with IEC 61000-4-5 surge immunity up to 1 kV open-circuit / 0.5 kA short-circuit test levels. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness - suitable for ADAS sensor power rails. |
| Halogen-free & RoHS-compliant | Meets IPC-1752A material declaration requirements and EU Directive 2011/65/EU; supports green manufacturing and end-of-life recycling. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage overshoot during clamping - critical for protecting 48 V-rated MOSFET gates and 3.3 V/5 V logic interfaces. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking; reduces production handling overhead and BOM management complexity. |
Applications
| Industrial Sensor Interface | Telecom Line Protection |
|---|---|
|
Use Scenario: Protecting RS-485 transceivers and analog sensor outputs (e.g., 4–20 mA loops) from induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Bidirectional clamping element placed across differential bus lines or supply-to-ground, absorbing common-mode and differential transients. Use Value: Limits transient voltage to ≤64.5 V during 10/1000 µs surges, preventing latch-up or gate oxide damage in TI THVD1550 or Maxim MAX14841 transceivers. |
Use Scenario: Shielding Ethernet PHY power supplies and PoE injectors from lightning-induced surges on outdoor telecom links. IC Role / Device Role / Timing Role: Secondary-level TVS on 48 V PoE input rails and isolated data line terminations, coordinated with primary GDT or MOV stages. Use Value: Provides <1 ns response and 600 W dissipation to clamp residual surges after upstream protection, maintaining IEEE 802.3bt compliance. |
| Automotive Body Control Module | Consumer Appliance Motor Drive |
|
Use Scenario: Safeguarding LIN bus transceivers and microcontroller I/O pins in door module ECUs exposed to load-dump and jump-start events. IC Role / Device Role / Timing Role: Bidirectional TVS on LIN signal line (VPW) and 12 V supply rail, leveraging AEC-Q101 qualification for automotive deployment. Use Value: Withstands 12 V system transients up to ±100 V/500 ms (load dump) and clamps fast ESD pulses to protect NXP MC33664 transceivers. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in smart home appliances (e.g., vacuum cleaners, washing machines). IC Role / Device Role / Timing Role: Across motor terminals and H-bridge supply rails to clamp inductive kickback during PWM switching. Use Value: 64.5 V clamping voltage prevents overvoltage failure of ST L99H02 half-bridge drivers and maintains EMC performance per CISPR 14-1. |
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/H | Same electrical specs and SMB package, but RoHS-compliant commercial grade (not AEC-Q101 qualified); uses standard tin plating instead of whisker-tested matte tin. | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated. | Select when cost sensitivity outweighs automotive reliability requirements and no extended temperature or lifetime validation is needed. |
| SMAJ40CAHM3 | Lower peak pulse power (400 W vs. 600 W); same VWM/VC but higher RθJA (140 °C/W); SMA (DO-214AC) package with smaller footprint and lower thermal mass. | Reduced surge handling margin; limited to lower-energy transients (e.g., IEC 61000-4-2 ESD only, not full IEC 61000-4-5). | Choose for space-constrained consumer boards where 400 W rating suffices and PCB area is prioritized over surge robustness. |
Compared with SMBJ40CAHE3/H, the SMBJ40CAHM3/H adds AEC-Q101 qualification and whisker-resistant plating for automotive use; versus SMAJ40CAHM3, it delivers 50% higher surge power and superior thermal dissipation in the larger SMB package - critical for high-reliability industrial and vehicle applications.
Availability
SMBJ40CAHM3/H is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line protection, automotive body control modules, and consumer appliance motor drives requiring stable component supply with halogen-free, AEC-Q101-qualified TVS diodes.
Supply support for SMBJ40CAHM3/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-energy transient suppression in harsh environments, engineered for automotive, industrial, and telecom infrastructure where robustness, consistency, and regulatory compliance are mandatory.
FAQ
What is the clamping voltage of SMBJ40CAHM3/H at its rated peak pulse current?
The SMBJ40CAHM3/H has a maximum clamping voltage (VC) of 64.5 V at 9.3 A peak pulse current (IPPM) under the standardized 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay Document 88392, ensuring predictable overvoltage limiting during surge events. The SMBJ40CAHM3/H maintains this clamping performance across its full operating temperature range.
Is SMBJ40CAHM3/H suitable for automotive applications?
Yes, SMBJ40CAHM3/H is AEC-Q101 qualified, as indicated by the "HM3" suffix and documented in Vishay's ordering information table (page 3, Document 88392). It undergoes rigorous stress testing including temperature cycling, high-temperature reverse bias, and ESD verification - making it appropriate for under-hood and body-control applications. The SMBJ40CAHM3/H meets automotive reliability requirements without derating for ambient temperatures up to +125 °C.
How does the bidirectional design of SMBJ40CAHM3/H affect circuit placement?
The SMBJ40CAHM3/H has symmetrical terminals with no polarity marking, allowing placement across any two nodes subject to bidirectional transients - such as differential signal lines (RS-485, CAN), AC power inputs, or floating sensor bridges. Unlike unidirectional TVS diodes, the SMBJ40CAHM3/H eliminates orientation errors during automated assembly and supports protection on non-ground-referenced paths without additional circuit analysis.
What is the thermal resistance of SMBJ40CAHM3/H, and how does it impact layout?
The SMBJ40CAHM3/H 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, as specified in Vishay Document 88392. This value requires adequate copper pour and thermal vias for sustained surge duty cycles; exceeding 5.0 W steady-state power dissipation demands thermal derating above 25 °C ambient. Layout must follow the recommended pad dimensions in the package outline drawing (page 5).
Does SMBJ40CAHM3/H meet RoHS and halogen-free compliance standards?
Yes, the "HM3" suffix in SMBJ40CAHM3/H explicitly denotes halogen-free, RoHS-compliant construction per Vishay's material categorization (Document 99912). It contains no brominated flame retardants, chlorine, or other restricted halogens, and satisfies IPC-1752A reporting requirements. The SMBJ40CAHM3/H is certified for green manufacturing and aligns with EU Directive 2011/65/EU and JEDEC JS709E.
SMBJ40CAHM3/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:
- 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:
- 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/H FAQ
1.How can I place an order for SMBJ40CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40CAHM3/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/H reliable?
The price and inventory of SMBJ40CAHM3/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/H is usually 5 days.
3.What payment methods are accepted for SMBJ40CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40CAHM3/H?
SMBJ40CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40CAHM3/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/H?
For technical support, including SMBJ40CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40CAHM3/H requirements.
6.How does Aetrix verify that SMBJ40CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ40CAHM3/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/H meets industry standards.
7.What is the process for return or replacement of SMBJ40CAHM3/H?
All SMBJ40CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40CAHM3/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/H part is unused and in its original packaging.
Return procedure for SMBJ40CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ40CAHM3/H Tags
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