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Vishay General Semiconductor - Diodes Division SMB8J40CAHE3_A/I
- Part No.:
- SMB8J40CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J40CAHE3_A/I.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,878
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Product details
Overview
SMB8J40CAHE3_A/I 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 transients.
For engineers reviewing the SMB8J40CAHE3_A/I datasheet, SMB8J40CAHE3_A/I pinout, SMB8J40CAHE3_A/I application, or SMB8J40CAHE3_A/I equivalent, this device is selected for robust bidirectional clamping in automotive-grade 12 V/24 V systems where low leakage (<1.0 µA at VWM), fast response (<1 ns), and MSL Level 1 reflow compatibility are critical design requirements.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal bias it presents <1.0 µA reverse leakage at 40 V, then rapidly avalanches when transient voltage exceeds its 44.4–49.1 V breakdown range (tested at 1 mA). Its bidirectional symmetry enables protection of AC-coupled or differential signal paths without polarity constraints.
Thermal performance is defined by RθJA = 72 °C/W and RθJL = 20 °C/W, supporting operation up to +150 °C junction temperature. The glass-passivated junction and matte tin-plated leads meet J-STD-002 solderability and JESD201 Class 2 whisker resistance standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 40 V - Maximum continuous reverse working voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 44.4–49.1 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering above system nominal voltage. |
| VC (Clamping Voltage) | 64.5 V at IPPM = 12.4 A - Peak voltage seen by protected circuit during 10/1000 µs surge; determines downstream component stress. |
| PPPM (Peak Pulse Power) | 800 W (10/1000 µs) - Energy-handling capacity for standardized surge waveforms; validates suitability for ISO 7637-2 Pulse 5a/b. |
| ID (Reverse Leakage) | ≤1.0 µA at 40 V - Minimal standby power loss and signal integrity impact in always-on automotive modules. |
| TJ max | +150 °C - Enables deployment in engine bay or powertrain control units without derating in high-ambient environments. |
| AEC-Q101 Qualified | Yes - Validated for automotive electronic systems per stress test requirements including HTOL, TCT, and ESD HBM/MM. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical terminals suitable for placement across differential or AC signal paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient current path | Both terminals conduct equally during positive or negative surges; no orientation required on PCB. |
| Case (body) | Thermal and mechanical interface | Plastic body with UL 94 V-0 rating; mounted on 5.0 mm × 5.0 mm copper pads per terminal for thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, RS-485 buses, or dual-rail power inputs without external polarity management. |
| AEC-Q101 qualification | Validates reliability for automotive applications including infotainment, ADAS sensors, and body control modules. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, improving protection margin for 3.3 V/5 V logic interfaces downstream. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow without moisture sensitivity concerns or baking requirements. |
| Glass-passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift in harsh under-hood environments. |
Applications
| Automotive Sensor Protection | CAN Bus Interface Protection |
|---|---|
|
Use Scenario: Protecting analog output pins of pressure, temperature, or position sensors in engine control units exposed to load dump and ISO 7637-2 transients. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly at sensor connector or ASIC input pins. Use Value: Limits induced surge voltage to ≤64.5 V, preventing latch-up or gate oxide damage in precision ADC front-ends. |
Use Scenario: Safeguarding CANH/CANL lines in automotive gateway modules subjected to ESD (±25 kV contact) and coupled noise. IC Role / Device Role / Timing Role: Bidirectional TVS pair (one per line) placed adjacent to CAN transceiver I/O pins. Use Value: Clamps fast ESD events within <1 ns while maintaining <1.0 µA leakage to avoid bus bias shift or false dominant detection. |
| 12 V Power Rail Protection | Industrial PLC Digital I/O Protection |
|
Use Scenario: Guarding microcontroller power supply inputs in telematics units powered from vehicle battery with intermittent cranking dips and jump-start spikes. IC Role / Device Role / Timing Role: Parallel-connected TVS across VCC and GND near LDO input capacitor. Use Value: Absorbs 800 W surges without degradation, sustaining 40 V DC operation and surviving repeated 12 V load-dump pulses per ISO 16750-2. |
Use Scenario: Shielding digital input channels of programmable logic controllers connected to field wiring prone to lightning-induced surges. IC Role / Device Role / Timing Role: Point-of-entry protection on terminal block side of optocoupler isolation barrier. Use Value: Provides 64.5 V clamping ceiling compatible with 24 V industrial logic thresholds, reducing need for secondary crowbar circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient 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 HE3 suffix packaging. | Restricted to non-automotive industrial or consumer use; not approved for OEM automotive BOMs. | Select only if AEC-Q101 compliance is not required and cost sensitivity outweighs long-term reliability validation. |
| SMCJ40CAHE3_A/I | Same electrical specs but SMC (DO-214AB) package - larger footprint (7.11 mm × 6.22 mm vs. 4.57 mm × 3.94 mm) and higher PPPM (1500 W). | Used where higher surge margin is needed and PCB space allows; not drop-in due to different pad layout and thermal mass. | Choose when system-level testing requires >800 W surge handling and board real estate permits larger package. |
Compared with SMB8J40CAHE3_A/I, SMBJ40CA-E3/52 offers identical clamping performance at lower cost but no automotive qualification, while SMCJ40CAHE3_A/I delivers greater energy absorption in a physically larger package requiring layout revision.
Availability
SMB8J40CAHE3_A/I is available at Aetrix Electronics and suitable for automotive sensor protection, CAN bus interface hardening, and 12 V power rail surge suppression requiring stable component supply across production lifecycles.
Supply support for SMB8J40CAHE3_A/I 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 designs and manufactures discrete semiconductors including diodes, MOSFETs, and TVS devices, with emphasis on high-reliability, automotive-qualified components.
The SMB8JxxCA family targets automotive and industrial transient protection, engineered specifically to meet AEC-Q101 and ISO 7637-2 requirements while maintaining low-profile SMB packaging for space-constrained ECUs.
FAQ
What is the clamping voltage of SMB8J40CAHE3_A/I at its rated peak pulse current?
The SMB8J40CAHE3_A/I has a maximum clamping voltage (VC) of 64.5 V when subjected to its rated peak pulse current of 12.4 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events, ensuring compatibility with 40 V-rated downstream components.
Is SMB8J40CAHE3_A/I suitable for protecting CAN FD interfaces?
Yes, SMB8J40CAHE3_A/I is suitable for CAN FD interface protection due to its bidirectional symmetry, sub-1 ns response time, and low leakage (<1.0 µA at 40 V), which avoids signal distortion on high-speed differential lines. Its 64.5 V clamping ceiling provides margin above CAN FD's ±40 V common-mode range while meeting AEC-Q101 requirements for automotive deployment.
Does SMB8J40CAHE3_A/I require orientation during PCB placement?
No, SMB8J40CAHE3_A/I does not require orientation during PCB placement because it is a bidirectional TVS diode with symmetrical terminals and no cathode marking. The SMB (DO-214AA) package has identical electrical behavior regardless of mounting direction, simplifying automated assembly and eliminating polarity-related assembly errors.
What is the meaning of the "HE3" and "_A/I" suffixes in SMB8J40CAHE3_A/I?
The "HE3" suffix indicates RoHS-compliant construction with AEC-Q101 qualification, while "_A/I" denotes the packaging variant: "A" is the revision code and "I" specifies 13-inch tape-and-reel delivery (3200 units per reel). This full ordering code ensures traceability to Vishay's qualified automotive-grade production lot and reflow-compatible packaging format.
How does SMB8J40CAHE3_A/I perform under high ambient temperature conditions?
SMB8J40CAHE3_A/I maintains specified performance up to +150 °C junction temperature, with derating applied above 25 °C ambient per Figure 2 in the datasheet. Its RθJA of 72 °C/W and RθJL of 20 °C/W enable reliable operation in under-hood environments when mounted on recommended 5.0 mm × 5.0 mm copper pads, making it suitable for engine control and transmission control units.
SMB8J40CAHE3_A/I 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:
- -
- 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_A/I FAQ
1.How can I place an order for SMB8J40CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J40CAHE3_A/I 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_A/I reliable?
The price and inventory of SMB8J40CAHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J40CAHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMB8J40CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J40CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J40CAHE3_A/I?
SMB8J40CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J40CAHE3_A/I 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_A/I?
For technical support, including SMB8J40CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J40CAHE3_A/I requirements.
6.How does Aetrix verify that SMB8J40CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMB8J40CAHE3_A/I 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_A/I meets industry standards.
7.What is the process for return or replacement of SMB8J40CAHE3_A/I?
All SMB8J40CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J40CAHE3_A/I, 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_A/I part is unused and in its original packaging.
Return procedure for SMB8J40CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J40CAHE3_A/I Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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