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Vishay General Semiconductor - Diodes Division SMBJ40CAHM3_B/H
- Part No.:
- SMBJ40CAHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40CAHM3_B/H.pdf
- Description:
- 600W,40V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:3,250
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Product details
Overview
SMBJ40CAHM3_B/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 signal or power 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 (10/1000 µs waveform), protecting MOSFETs and sensor interfaces in industrial motor drives.
For engineers reviewing the SMBJ40CAHM3_B/H datasheet, SMBJ40CAHM3_B/H pinout, SMBJ40CAHM3_B/H application, or SMBJ40CAHM3_B/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, halogen-free RoHS compliance, and thermal resistance (RθJA = 100 °C/W) under standard PCB pad layout.
Technical Context
This device operates as a voltage-clamping protector with symmetrical breakdown behavior in both directions due to its bidirectional construction. Its glass-passivated junction ensures stable avalanche characteristics, while the low incremental surge resistance enables rapid energy absorption during transient events such as inductive switching surges or ESD pulses.
The SMBJ40CAHM3_B/H is rated for -55 °C to +150 °C operating junction temperature and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Its 100 A IFSM rating applies only to unidirectional variants; this bidirectional part has no forward surge rating but supports repetitive transient suppression up to 0.01% duty cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR min / max | 44.4 V / 49.1 V - Breakdown voltage range at 1 mA test current; ensures reliable triggering across process variation. |
| VC @ IPPM | 64.5 V - Clamped voltage at 9.3 A peak pulse current (10/1000 µs); determines protected circuit's maximum transient exposure. |
| PPPM | 600 W - Peak pulse power handling capacity; defines survivability against standardized lightning/surge waveforms. |
| IPPM | 9.3 A - Peak pulse current supported at VC; used with VC to calculate worst-case power dissipation during transient. |
| TJ max | +150 °C - Maximum junction temperature; sets thermal derating limit for sustained operation near power dissipation limits. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; guides heatsinking requirements. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, matte tin-plated terminals solderable per J-STD-002. No polarity marking on bidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | Accepts surge current in either polarity; connects to line being protected. |
| Cathode | Transient current exit (bidirectional) | Completes clamping path to ground or reference rail; symmetric with anode in CA devices. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns. |
| 600 W peak pulse power (10/1000 µs) | Withstands IEC 61000-4-5 Level 3 surge (1 kV/2 Ω) on 50 Ω source impedance lines. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive electronics use including engine control modules and body electronics. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without moisture sensitivity handling. |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes overvoltage stress on downstream ICs compared to higher-ratio suppressors. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate drivers and feedback sensors against inductive kickback from relay coils and solenoid loads. IC Role / Device Role / Timing Role: Voltage clamping element placed across MOSFET gate-source or sensor supply rails. Use Value: Limits transient overshoot to ≤64.5 V, preventing gate oxide rupture in 60 V-rated logic-level MOSFETs. |
Use Scenario: Shielding LIN bus transceivers and microcontroller I/O pins from load dump and jump-start surges. IC Role / Device Role / Timing Role: Bidirectional shunt protector on 12 V power and data lines with no polarity dependency. Use Value: Maintains system uptime by absorbing 600 W surges without degradation, validated per AEC-Q101 stress tests. |
| Industrial PLC Analog Input Modules | Smart Sensor Signal Conditioning |
|
Use Scenario: Guarding 4–20 mA current loop inputs against field wiring faults and electrostatic discharge. IC Role / Device Role / Timing Role: Primary overvoltage clamp on input differential pair, upstream of precision op-amps. Use Value: Clamps transients within 1 ns response time while adding <1 pF junction capacitance at zero bias, preserving signal integrity. |
Use Scenario: Safeguarding MEMS accelerometer and temperature sensor outputs connected to MCU ADC inputs. IC Role / Device Role / Timing Role: Low-leakage (<1 µA at 40 V) bidirectional clamp on low-current analog output lines. Use Value: Prevents ADC saturation and latch-up during ESD events while introducing negligible offset error in DC-coupled paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40CAHE3_B/H | Same electrical specs, RoHS-compliant but not halogen-free; uses standard tin plating instead of halogen-free molding compound. | Lacks halogen-free certification required for some automotive Tier 1 supply chains. | Select when halogen-free compliance is not mandated and cost optimization is prioritized. |
| SMAJ40CAHM3 | Lower 400 W PPPM, same VWM/VC, SMA (DO-214AC) package with higher RθJA (140 °C/W). | Reduced surge margin and inferior thermal performance on identical PCB area. | Acceptable only for lower-energy transients or space-constrained layouts where SMB footprint is unavailable. |
Compared with SMBJ40CAHM3_B/H, the HE3 variant trades halogen-free compliance for broader commercial availability, while the SMAJ40CAHM3 sacrifices 33% pulse power headroom and thermal efficiency-making the SMBJ40CAHM3_B/H optimal for high-reliability industrial and automotive designs demanding full 600 W surge immunity.
Availability
SMBJ40CAHM3_B/H is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and smart sensor signal conditioning requiring stable component supply with AEC-Q101 qualification and halogen-free compliance.
Supply support for SMBJ40CAHM3_B/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, and transient protection devices with emphasis on reliability and automotive-grade validation.
The SMBJ series was developed specifically for robust, surface-mount transient suppression in harsh environments-including automotive, industrial automation, and telecom infrastructure-where consistent clamping performance and long-term stability are critical.
FAQ
What is the clamping voltage of SMBJ40CAHM3_B/H at its rated peak pulse current?
The SMBJ40CAHM3_B/H has a maximum clamping voltage (VC) of 64.5 V at 9.3 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured with the device mounted on 0.2" × 0.2" copper pads per JEDEC guidelines and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ40CAHM3_B/H maintains this clamping performance across its full operating temperature range.
Is SMBJ40CAHM3_B/H suitable for automotive applications?
Yes, SMBJ40CAHM3_B/H is AEC-Q101 qualified (indicated by the HM3 suffix), making it suitable for automotive applications including body control modules, infotainment power supplies, and sensor interfaces. Its halogen-free, RoHS-compliant construction meets stringent automotive material requirements, and its -55 °C to +150 °C operating range supports under-hood and cabin deployment. The SMBJ40CAHM3_B/H undergoes accelerated stress testing per AEC-Q101 Rev D.
How does the bidirectional design of SMBJ40CAHM3_B/H affect its circuit placement?
The bidirectional design of SMBJ40CAHM3_B/H eliminates polarity constraints, allowing placement across AC-coupled lines, floating differential pairs, or ungrounded signal paths without regard to anode/cathode orientation. Unlike unidirectional TVS diodes, SMBJ40CAHM3_B/H has no band marking and functions identically in both directions-simplifying layout, reducing BOM count, and avoiding reverse-installation risk in automated assembly. This symmetry is essential for protecting LIN, CAN, or RS-485 bus lines.
What is the thermal resistance of SMBJ40CAHM3_B/H, and how does it impact PCB layout?
The SMBJ40CAHM3_B/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on minimum recommended 0.2" × 0.2" copper pads per terminal. This value assumes standard FR-4 board material and no additional heatsinking. To maintain safe junction temperatures during repetitive surges, designers must ensure adequate copper area and avoid excessive trace length between the SMBJ40CAHM3_B/H and ground/power planes. Derating curves in the datasheet guide thermal design above 25 °C ambient.
Does SMBJ40CAHM3_B/H have a specified junction capacitance, and how does it affect high-speed signal lines?
Yes, SMBJ40CAHM3_B/H exhibits a typical junction capacitance of approximately 120 pF at zero bias (measured at 1 MHz), which decreases significantly at operating reverse voltages near VWM. While not optimized for RF or >100 Mbps digital lines, this capacitance is acceptable for analog sensor outputs, LIN bus, and low-speed industrial communications. For high-frequency applications, designers should verify signal integrity using the SMBJ40CAHM3_B/H's published CJ-V curve and consider layout techniques like guard traces to minimize coupling.
SMBJ40CAHM3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Bulk
- 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/H FAQ
1.How can I place an order for SMBJ40CAHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40CAHM3_B/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_B/H reliable?
The price and inventory of SMBJ40CAHM3_B/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_B/H is usually 5 days.
3.What payment methods are accepted for SMBJ40CAHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40CAHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40CAHM3_B/H?
SMBJ40CAHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40CAHM3_B/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_B/H?
For technical support, including SMBJ40CAHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40CAHM3_B/H requirements.
6.How does Aetrix verify that SMBJ40CAHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ40CAHM3_B/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_B/H meets industry standards.
7.What is the process for return or replacement of SMBJ40CAHM3_B/H?
All SMBJ40CAHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40CAHM3_B/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_B/H part is unused and in its original packaging.
Return procedure for SMBJ40CAHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ40CAHM3_B/H Tags
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