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Vishay General Semiconductor - Diodes Division SMB8J40CAHE3_B/H
- Part No.:
- SMB8J40CAHE3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J40CAHE3_B/H.pdf
- Description:
- 800W,40V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:9,147
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Product details
Overview
SMB8J40CAHE3_B/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 clamping voltage (VC) at 12.4 A peak pulse current. It is AEC-Q101 qualified and used to protect automotive sensor signal lines and power rails against ESD and load-dump transients.
For engineers reviewing the SMB8J40CAHE3_B/H datasheet, SMB8J40CAHE3_B/H pinout, SMB8J40CAHE3_B/H application, or SMB8J40CAHE3_B/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 40 V working voltage, low thermal resistance (RθJL = 20 °C/W), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within <1 ps to transients and maintaining low dynamic impedance during surge events. Its glass-passivated junction ensures stable breakdown behavior and long-term reliability under repetitive surge stress.
The device complies with ANSI/IEEE C62.35 for transient suppression and meets MSL Level 1 per J-STD-020 with 260 °C lead-free reflow peak temperature. Its bidirectional symmetry enables use on AC-coupled or floating signal paths without polarity concerns.
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 band at 1 mA test current; ensures predictable turn-on threshold across production lots. |
| VC @ IPPM | 64.5 V - Clamped voltage at 12.4 A peak pulse current (10/1000 µs); determines maximum voltage seen by downstream ICs during surge. |
| PPPM | 800 W - Peak pulse power handling capability; supports robust protection against ISO 7637-2 Pulse 5a (load dump) in automotive 12 V systems. |
| RθJL | 20 °C/W - Junction-to-lead thermal resistance; enables effective heat dissipation into PCB copper when mounted per recommended pad layout. |
| TJ max | +150 °C - Maximum junction temperature; allows operation in under-hood automotive environments with sustained ambient up to +125 °C. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including HTOL, TC, UHAST, and ESD testing per AEC specification. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical two-terminal construction with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient current path | Both terminals serve identically as surge conduction paths; no cathode band - device functions identically regardless of orientation on PCB. |
| Case (body) | Thermal interface | Plastic case transfers heat to PCB copper pads; requires minimum 5.0 mm × 5.0 mm copper area per terminal for rated power derating. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units, ADAS sensors, and body electronics requiring zero-failure field reliability. |
| Low incremental surge resistance | Enables tighter clamping (VC/VBR ratio = 1.45) and higher energy absorption efficiency versus standard TVS diodes in same package. |
| MSL Level 1 rating | Allows unlimited floor life and single-reflow processing at 260 °C peak without moisture-induced damage or popcorn effect. |
| Glass-passivated junction | Provides stable VBR over temperature and lifetime, with minimal parameter drift after 1000+ surge cycles at rated IPPM. |
| RoHS-compliant & halogen-free option | HE3 suffix denotes RoHS-compliant construction; HM3 variant adds halogen-free molding compound for stringent environmental compliance. |
Applications
| Automotive Sensor Protection | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protecting LIN/CAN transceiver I/O pins in automotive door modules exposed to battery transients and ESD. IC Role / Device Role / Timing Role: Bidirectional shunt clamp absorbing ISO 10605 ESD (±30 kV) and ISO 7637-2 Pulse 1/2/5a surges before they reach the transceiver. Use Value: Prevents latch-up or permanent damage to transceivers while maintaining signal integrity due to low capacitance (<100 pF at 0 V) and symmetric clamping. |
Use Scenario: Safeguarding RS-485/CAN FD physical layer interfaces in factory automation PLCs subjected to ground bounce and lightning-induced surges. IC Role / Device Role / Timing Role: Fast-response voltage limiter placed across differential bus lines (CAN_H/CAN_L) to clamp common-mode transients up to ±50 V. Use Value: Maintains bus communication continuity during 800 W surge events without signal distortion, thanks to sub-nanosecond response and low clamping overshoot. |
| Consumer Power Adapter Input | Telecom DC Power Feed |
Use Scenario: Secondary-side overvoltage protection on 12 V/24 V outputs of wall adapters powering IoT gateways and smart home hubs. IC Role / Device Role / Timing Role: Standoff-rated (40 V) TVS that remains non-conductive during normal operation but clamps fast-rising line transients from switching noise or hot-plug events. Use Value: Eliminates need for series resistors or RC filters while providing certified 800 W surge immunity per IEC 61000-4-5 Level 3. |
Use Scenario: DC feed protection in PoE-powered telecom base stations where 48 V supply lines are vulnerable to induced surges from nearby lightning strikes. IC Role / Device Role / Timing Role: Bidirectional clamp installed between DC input and ground to divert surge current away from DC-DC converters and PMICs. Use Value: Enables compact design with SMB footprint while meeting GR-1089-CORE surge requirements (10/1000 µs, 100 A) via parallel staging if needed. |
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-E3/52 | Unqualified commercial grade; same VWM/VC/PPPM but lacks AEC-Q101 validation and MSL Level 1 reflow rating. | Suitable for industrial or consumer designs without automotive qualification mandates. | Select when cost sensitivity outweighs automotive reliability requirements and reflow profile is controlled. |
| SMCJ40CAHE3_A/H | Same electrical specs but in larger SMC (DO-214AB) package; higher RθJA (40 °C/W vs. 72 °C/W) but 1500 W PPPM rating. | Better suited for high-power 24 V systems needing >1000 W surge margin, e.g., commercial vehicle ECUs. | Choose when board space permits larger footprint and higher surge headroom is required beyond 800 W. |
Compared with SMBJ40CA-E3/52, SMB8J40CAHE3_B/H adds automotive qualification and enhanced process control for mission-critical nodes; versus SMCJ40CAHE3_A/H, it trades peak power for compactness and lower thermal resistance in constrained layouts.
Availability
SMB8J40CAHE3_B/H is available at Aetrix Electronics and suitable for automotive sensor protection, industrial CAN bus interfaces, and telecom DC power feed applications requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMB8J40CAHE3_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, MOSFETs, and protection devices with emphasis on reliability, power density, and application-specific qualification.
The SMB8JxxCA family targets automotive and industrial transient suppression, engineered for AEC-Q101 compliance, high surge robustness in minimal footprint, and seamless integration into automated SMT lines.
FAQ
What is the clamping voltage of SMB8J40CAHE3_B/H at its rated peak pulse current?
The SMB8J40CAHE3_B/H has a maximum clamping voltage (VC) of 64.5 V at 12.4 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures downstream components see no more than 64.5 V during surge events, making it suitable for protecting 40 V-rated circuits in automotive and industrial systems.
Is SMB8J40CAHE3_B/H compatible with lead-free reflow processes?
Yes, SMB8J40CAHE3_B/H is rated for MSL Level 1 per J-STD-020 and supports peak reflow temperatures up to 260 °C. Its matte tin-plated leads comply with J-STD-002 and JESD 22-B102, enabling reliable solder joint formation in standard lead-free SMT assembly without preconditioning or dry-pack requirements.
How does SMB8J40CAHE3_B/H differ from unidirectional variants like SMB10J40AHE3_B/H?
SMB8J40CAHE3_B/H is bidirectional with symmetrical breakdown in both polarities, while SMB10J40AHE3_B/H is unidirectional and conducts only in reverse bias. The bidirectional version protects AC-coupled or floating lines (e.g., CAN_H/CAN_L), whereas the unidirectional type suits DC rail protection where polarity is fixed and forward conduction must be blocked.
What is the thermal resistance from junction to ambient for SMB8J40CAHE3_B/H?
The typical junction-to-ambient thermal resistance (RθJA) of SMB8J40CAHE3_B/H is 72 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard JEDEC test conditions and guides thermal design for sustained surge duty cycles - for higher power handling, consider enhancing copper area or adding thermal vias.
Does SMB8J40CAHE3_B/H meet automotive qualification standards?
Yes, SMB8J40CAHE3_B/H is AEC-Q101 qualified, having passed stress tests including high-temperature operating life (HTOL), temperature cycling (TC), unbiased highly accelerated stress test (UHAST), and human-body-model ESD (≥8 kV). The HE3 suffix explicitly denotes this automotive-grade qualification, distinguishing it from commercial-grade variants.
SMB8J40CAHE3_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):
- 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)
SMB8J40CAHE3_B/H FAQ
1.How can I place an order for SMB8J40CAHE3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J40CAHE3_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 SMB8J40CAHE3_B/H reliable?
The price and inventory of SMB8J40CAHE3_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 SMB8J40CAHE3_B/H is usually 5 days.
3.What payment methods are accepted for SMB8J40CAHE3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J40CAHE3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J40CAHE3_B/H?
SMB8J40CAHE3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J40CAHE3_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 SMB8J40CAHE3_B/H?
For technical support, including SMB8J40CAHE3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J40CAHE3_B/H requirements.
6.How does Aetrix verify that SMB8J40CAHE3_B/H is sourced from the original manufacturer or authorized distributors?
All SMB8J40CAHE3_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 SMB8J40CAHE3_B/H meets industry standards.
7.What is the process for return or replacement of SMB8J40CAHE3_B/H?
All SMB8J40CAHE3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J40CAHE3_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 SMB8J40CAHE3_B/H part is unused and in its original packaging.
Return procedure for SMB8J40CAHE3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J40CAHE3_B/H Tags
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