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Vishay General Semiconductor - Diodes Division SMB8J40CAHM3_A/H
- Part No.:
- SMB8J40CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J40CAHM3_A/H.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMB8J40CAHM3_A/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection with 800 W peak pulse power (10/1000 μs), 40 V stand-off voltage (VWM), and 64.5 V maximum clamping voltage (VC) at 12.4 A peak pulse current. It is AEC-Q101 qualified and used to protect automotive sensor signal lines, CAN transceivers, and power supply inputs against ESD and load dump.
For engineers reviewing the SMB8J40CAHM3_A/H datasheet, SMB8J40CAHM3_A/H pinout, SMB8J40CAHM3_A/H application, or SMB8J40CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 40 V working voltage, 64.5 V clamping under 12.4 A surge, and SMB package compatibility with automated SMT placement on automotive PCBs.
Technical Context
This device operates as a silicon avalanche diode with symmetrical breakdown behavior in both polarities, enabling robust protection of AC-coupled or differential signal paths without polarity sensitivity. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and repeatable clamping performance across temperature (-55 °C to +150 °C).
The SMB8J40CAHM3_A/H delivers low incremental surge resistance and fast response time (<1 ns), meeting ANSI/IEEE C62.35 standards for transient suppression. Its thermal resistance (RθJA = 72 °C/W) and RθJL = 20 °C/W support reliable operation under repetitive surge conditions when mounted on minimum recommended 5.0 mm × 5.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal swing range for protected circuitry. |
| VBR min/max | 44.4 V / 49.1 V - Breakdown occurs within this range at 1 mA test current; ensures predictable turn-on threshold under surge. |
| VC @ IPPM | 64.5 V at 12.4 A - Clamping voltage during 10/1000 μs surge; limits downstream voltage stress to safe levels. |
| PPPM | 800 W - Peak pulse power handling capacity; determines survivability against ISO 7637-2 Pulse 1/2a/5a surges. |
| IPPM | 12.4 A - Peak surge current supported at rated clamping voltage; correlates directly with system-level surge immunity. |
| Junction Temp | -55 °C to +150 °C - Operating and storage range compatible with under-hood automotive environments. |
| Leakage @ VWM | ≤1.0 μA - Minimal DC loading on signal lines; preserves integrity of high-impedance sensor interfaces. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, MSL Level 1 (260 °C reflow peak). Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); cathode band not marked (bidirectional type).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically; no polarity marking required-enables flexible layout on differential or AC lines. |
| Case (body) | Thermal and mechanical interface | Plastic molded body with matte tin-plated leads; solderable per J-STD-002; requires 5.0 mm × 5.0 mm copper pad per terminal for rated power dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment power rails. |
| Glass-passivated junction | Ensures long-term stability of breakdown voltage and leakage under thermal cycling and humidity exposure. |
| Low profile SMB package | Enables high-density PCB layouts and compatibility with standard SMT pick-and-place equipment. |
| 800 W peak pulse power | Withstands ISO 16750-2 load dump surges up to 12 V systems and ISO 7637-2 Pulse 5a events. |
| MSL Level 1 rating | Allows unlimited floor life and single-reflow processing without baking-reduces manufacturing overhead. |
Applications
| Automotive Sensor Protection | CAN Bus Transient Suppression |
|---|---|
Use Scenario: Protecting analog output lines of pressure, temperature, and position sensors in engine bay modules exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional clamping TVS placed at sensor connector interface to shunt transients before reaching ADC input or signal conditioner. Use Value: Maintains signal fidelity by limiting voltage excursions to ≤64.5 V during 12.4 A surges, preventing ADC saturation or op-amp latch-up. | Use Scenario: Safeguarding CANH/CANL differential pair in automotive body control modules against ESD and coupled noise from nearby solenoids or motors. IC Role / Device Role / Timing Role: Symmetrical TVS connected across CANH–CANL to clamp common-mode and differential transients without disrupting bus biasing. Use Value: Enables compliance with ISO 11898-2 EMC requirements while preserving <1 ns response time and minimal capacitance impact on 1 Mbps signaling. |
| Industrial PLC I/O Protection | Power Supply Input Clamping |
Use Scenario: Shielding 24 V digital input channels in programmable logic controllers from field-wiring induced surges and inductive kickback. IC Role / Device Role / Timing Role: Bidirectional TVS installed between input terminal and ground to divert energy from relay coils or valve drivers. Use Value: Survives repeated 100 A/10 ms surges per IEC 61000-4-5 Level 4, extending module service life in factory automation environments. | Use Scenario: Front-end clamping on 40 V-rated DC-DC converter inputs subjected to battery jump-start transients in commercial vehicle electronics. IC Role / Device Role / Timing Role: Primary overvoltage clamp positioned after fuse but before input capacitor to absorb energy before regulator stage. Use Value: Limits input rail overshoot to 64.5 V during 12.4 A pulses, preventing gate oxide damage in synchronous MOSFETs and controller ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J40CAHE3_A/H | Same electrical specs and AEC-Q101 qualification; RoHS-compliant but not halogen-free. | Identical use cases; suitable where halogen-free requirement is not mandated by OEM spec. | Select when cost optimization is prioritized and halogen content is unrestricted. |
| SMAJ40CA | Lower PPPM (400 W), higher VC (69.4 V at 5.8 A), SMA package (smaller footprint, higher RθJA). | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a or load dump in 24 V systems. | Choose only for space-constrained non-automotive designs with verified lower surge threat profiles. |
Compared with SMB8J40CAHE3_A/H, the SMB8J40CAHM3_A/H adds halogen-free compliance for stricter environmental mandates; versus SMAJ40CA, it provides 100 % higher surge power handling and tighter clamping-critical for automotive-grade reliability.
Availability
SMB8J40CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, CAN bus nodes, industrial PLC I/O modules, and 24–40 V power supply inputs requiring stable component supply and AEC-Q101 assurance.
Supply support for SMB8J40CAHM3_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 automotive, industrial, and computing applications.
The SMB8JxxCA series targets high-reliability transient suppression in harsh environments, engineered specifically to meet AEC-Q101 and ISO 16750 requirements for modern vehicle electronics.
FAQ
What is the clamping voltage of SMB8J40CAHM3_A/H at its rated peak pulse current?
The SMB8J40CAHM3_A/H has a maximum clamping voltage (VC) of 64.5 V at its rated peak pulse current (IPPM) of 12.4 A under a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and ensures downstream components experience limited overvoltage stress during surge events. The SMB8J40CAHM3_A/H maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is SMB8J40CAHM3_A/H suitable for protecting CAN FD interfaces?
Yes, SMB8J40CAHM3_A/H is suitable for CAN FD protection due to its bidirectional symmetry, sub-nanosecond response time, and low junction capacitance (typ. <100 pF at 0 V, per family data). Its 64.5 V clamping voltage does not interfere with CAN FD's 2 V differential swing, and its AEC-Q101 qualification confirms suitability for automotive serial bus environments. The SMB8J40CAHM3_A/H must be placed as close as possible to the connector with minimized trace length to preserve signal integrity.
Does SMB8J40CAHM3_A/H require a heatsink for standard automotive operation?
No, SMB8J40CAHM3_A/H does not require an external heatsink under normal surge conditions. Its thermal design relies on PCB copper pads (minimum 5.0 mm × 5.0 mm per terminal) to dissipate energy, achieving RθJA = 72 °C/W. In continuous operation with repetitive surges, thermal performance is maintained via proper pad layout and airflow-not added heatsinking. The SMB8J40CAHM3_A/H is rated for junction temperatures up to +150 °C, aligning with under-hood ambient limits.
How does the HM3 suffix affect the specifications of SMB8J40CAHM3_A/H?
The HM3 suffix denotes halogen-free, RoHS-compliant, and AEC-Q101 qualified construction-identical electrically to HE3-suffixed variants but with brominated flame retardant replaced by alternative chemistry in the molding compound. All key parameters (VWM, VC, PPPM, TJ) remain unchanged. The SMB8J40CAHM3_A/H meets JESD201 Class 2 whisker resistance and MSL Level 1 reflow compatibility, making it suitable for high-reliability automotive production.
Can SMB8J40CAHM3_A/H replace SMBJ40CA in an existing design?
No-SMB8J40CAHM3_A/H and SMBJ40CA are not interchangeable. SMBJ40CA is unidirectional (cathode-banded), while SMB8J40CAHM3_A/H is bidirectional (no marking). Substituting them risks incorrect clamping behavior on DC-biased lines. Additionally, SMBJ40CA has 1000 W PPPM vs. 800 W for SMB8J40CAHM3_A/H. The SMB8J40CAHM3_A/H is only a direct replacement for other SMB8JxxCA variants with identical suffix logic (HM3/HE3).
SMB8J40CAHM3_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):
- 12.4A
- Power - Peak Pulse:
- 800W
- 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)
SMB8J40CAHM3_A/H FAQ
1.How can I place an order for SMB8J40CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J40CAHM3_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 SMB8J40CAHM3_A/H reliable?
The price and inventory of SMB8J40CAHM3_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 SMB8J40CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMB8J40CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J40CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J40CAHM3_A/H?
SMB8J40CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J40CAHM3_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 SMB8J40CAHM3_A/H?
For technical support, including SMB8J40CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J40CAHM3_A/H requirements.
6.How does Aetrix verify that SMB8J40CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMB8J40CAHM3_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 SMB8J40CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMB8J40CAHM3_A/H?
All SMB8J40CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J40CAHM3_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 SMB8J40CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMB8J40CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J40CAHM3_A/H Tags
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