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Vishay General Semiconductor - Diodes Division SMB8J40CAHE3_A/H
- Part No.:
- SMB8J40CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J40CAHE3_A/H.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,990
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Product details
Overview
SMB8J40CAHE3_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 on signal and power lines. It features 40 V stand-off voltage (VWM), 64.5 V maximum clamping voltage (VC) at 12.4 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMB8J40CAHE3_A/H datasheet, SMB8J40CAHE3_A/H pinout, SMB8J40CAHE3_A/H application, or SMB8J40CAHE3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 150 °C junction temperature rating, low leakage (<1.0 µA at VWM), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This bidirectional TVS diode operates symmetrically across both polarities, enabling robust protection against ESD, lightning-induced transients, and inductive switching spikes without polarity sensitivity. Its glass-passivated junction ensures stable breakdown behavior and low incremental surge resistance under repetitive surge stress.
The device meets J-STD-020 MSL Level 1 (260 °C peak reflow), supports AEC-Q101 automotive qualification, and delivers consistent clamping performance up to 150 °C junction temperature - validated using ANSI/IEEE C62.35-compliant 10/1000 µs test waveforms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe working margin for 36 V nominal systems. |
| VBR min/max | 44.4 V / 49.1 V at 1.0 mA - Confirmed breakdown threshold range ensures reliable turn-on during overvoltage events. |
| VC @ IPPM | 64.5 V at 12.4 A - Clamping voltage under full-rated 10/1000 µs surge; limits protected circuit voltage stress. |
| PPPM | 800 W - Peak pulse power handling capacity; determines survivability against standardized lightning surges (IEC 61000-4-5). |
| ID @ VWM | <1.0 µA - Ultra-low reverse leakage preserves signal integrity and minimizes standby power loss in high-impedance circuits. |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and thermally constrained industrial enclosures. |
| Package | SMB (DO-214AA) - Surface-mount footprint with 2.2 mm × 3.9 mm body; compatible with standard 7" tape-and-reel (750 pcs) delivery. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case meeting UL 94 V-0 flammability rating; matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; no polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional surge conduction path | Either terminal serves as anode or cathode depending on transient polarity; no color band or marking required. |
| Cathode Band (N/A) | Not applicable | Bidirectional construction eliminates cathode identification; terminals are functionally identical. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan. |
| Glass passivated junction | Ensures stable VBR tolerance and long-term parameter stability under thermal and humidity stress. |
| MSL Level 1 | Supports lead-free reflow up to 260 °C peak without moisture-induced damage or popcorn effect. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during surge events - critical for protecting 3.3 V/5 V logic and analog front-ends. |
| Halogen-free option available | HM3 suffix variants meet RoHS and JEDEC JS709C halogen-free requirements for green manufacturing. |
Applications
| Automotive Sensor Interface | Industrial PLC Analog Input |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and MEMS pressure sensors from load-dump and ISO 7637-2 pulses in engine control units. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt surge energy before reaching signal conditioning ICs. Use Value: Maintains <1.0 µA leakage at 40 V VWM to avoid biasing errors in precision sensor bridges while clamping to 64.5 V under 12.4 A surge. |
Use Scenario: Safeguarding 4–20 mA current-loop inputs in programmable logic controllers exposed to field wiring transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on input terminals, coordinated with series current-limiting resistors and downstream op-amp protection. Use Value: Delivers 800 W PPPM handling with 64.5 V VC to prevent latch-up in instrumentation amplifiers while supporting -55 °C to +150 °C ambient operation. |
| Telecom Line Card Protection | Consumer Power Adapter ESD Guard |
|
Use Scenario: Secondary surge suppression on Ethernet PHY interface lines subjected to induced lightning surges per IEC 61000-4-5 Level 3. IC Role / Device Role / Timing Role: Fast-response TVS placed adjacent to RJ45 magnetics to limit common-mode voltage excursion during surge events. Use Value: Achieves sub-nanosecond response time and 64.5 V clamping to keep PHY ICs within absolute maximum ratings during 10/1000 µs transients. |
Use Scenario: Input-stage transient protection for USB-C PD adapters handling hot-plug and cable discharge events. IC Role / Device Role / Timing Role: First-line defense on AC-DC converter input rails, absorbing ESD and line-switching spikes before primary rectifier stage. Use Value: Provides 800 W surge rating with 40 V VWM to accommodate 36 V DC-link ripple while maintaining <1.0 µA leakage for low-noise standby operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J40CAHM3_A/H | Halogen-free variant with identical electrical specs and AEC-Q101 qualification; same SMB package and thermal performance. | No functional difference; selected when halogen-free compliance is mandated by OEM or regional environmental regulations. | Choose SMB8J40CAHM3_A/H if RoHS + JEDEC JS709C halogen-free certification is required for final assembly. |
| SMBJ40CAHE3_A/H | Lower PPPM (600 W vs. 800 W); same VWM (40 V), VC (64.5 V), and SMB package; unidirectional version not applicable here. | Reduced surge margin - suitable only where system-level testing confirms 600 W is sufficient for worst-case transients. | Select SMBJ40CAHE3_A/H only after validating that 600 W PPPM meets IEC 61000-4-5 immunity requirements for the target application. |
Compared with SMB8J40CAHE3_A/H, SMB8J40CAHM3_A/H offers identical protection performance with halogen-free materials, while SMBJ40CAHE3_A/H trades 25% lower peak pulse power for potentially broader commercial availability - neither is pin-compatible drop-in replacement due to differing surge ratings and qualification scope.
Availability
SMB8J40CAHE3_A/H is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC analog inputs, and telecom line card designs requiring stable component supply with AEC-Q101 assurance and full traceability.
Supply support for SMB8J40CAHE3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific optimization.
The SMB8JxxCA family targets high-reliability transient suppression in automotive and industrial environments, engineered to meet AEC-Q101 and deliver consistent clamping performance across extended temperature ranges.
FAQ
What is the clamping voltage of SMB8J40CAHE3_A/H at its rated peak pulse current?
The SMB8J40CAHE3_A/H has a maximum clamping voltage (VC) of 64.5 V at its rated peak pulse current (IPPM) of 12.4 A, measured using the standardized 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and ensures protected downstream ICs remain within their absolute maximum voltage ratings during surge events. The clamping behavior is symmetrical due to its bidirectional design.
Is SMB8J40CAHE3_A/H qualified for automotive applications?
Yes, SMB8J40CAHE3_A/H is AEC-Q101 qualified, meaning it has passed rigorous stress tests including high-temperature reverse bias, temperature cycling, and ESD per the automotive semiconductor reliability standard. The "HE3" suffix explicitly denotes RoHS-compliant and AEC-Q101 qualified construction, making SMB8J40CAHE3_A/H suitable for engine control units, ADAS sensor modules, and other under-hood or chassis-mounted systems.
What is the standoff voltage (VWM) and why is it important for SMB8J40CAHE3_A/H?
The standoff voltage (VWM) of SMB8J40CAHE3_A/H is 40 V - the maximum continuous reverse voltage the device can block without entering avalanche conduction. This parameter defines the operating margin between normal circuit voltage and clamping onset; selecting SMB8J40CAHE3_A/H for a 36 V nominal system provides 4 V headroom to prevent false triggering while ensuring rapid response above transient thresholds.
Does SMB8J40CAHE3_A/H have polarity markings on the package?
No, SMB8J40CAHE3_A/H does not have polarity markings because it is a bidirectional TVS diode. Its internal structure allows symmetrical clamping in both directions, so either terminal functions identically regardless of voltage polarity. Unlike unidirectional variants (e.g., SMB8J40A), no cathode band or other marking is present on the SMB (DO-214AA) case.
What is the thermal resistance and maximum junction temperature of SMB8J40CAHE3_A/H?
SMB8J40CAHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W and a maximum junction temperature (TJ max) of +150 °C. These values are specified with mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. The +150 °C rating enables reliable operation in high-temperature automotive and industrial environments when PCB layout adheres to recommended pad dimensions.
SMB8J40CAHE3_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:
- -
- 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/H FAQ
1.How can I place an order for SMB8J40CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J40CAHE3_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 SMB8J40CAHE3_A/H reliable?
The price and inventory of SMB8J40CAHE3_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 SMB8J40CAHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMB8J40CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J40CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J40CAHE3_A/H?
SMB8J40CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J40CAHE3_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 SMB8J40CAHE3_A/H?
For technical support, including SMB8J40CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J40CAHE3_A/H requirements.
6.How does Aetrix verify that SMB8J40CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMB8J40CAHE3_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 SMB8J40CAHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMB8J40CAHE3_A/H?
All SMB8J40CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J40CAHE3_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 SMB8J40CAHE3_A/H part is unused and in its original packaging.
Return procedure for SMB8J40CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J40CAHE3_A/H Tags
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