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Vishay General Semiconductor - Diodes Division SMB8J40CAHE3/5B
- Part No.:
- SMB8J40CAHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J40CAHE3/5B.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,474
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Product details
Overview
SMB8J40CAHE3/5B from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection on power and signal lines. It features a 40 V stand-off voltage (VWM), 44.4–49.1 V breakdown voltage (VBR), 64.5 V 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 SMB8J40CAHE3/5B datasheet, SMB8J40CAHE3/5B pinout, SMB8J40CAHE3/5B application, or SMB8J40CAHE3/5B equivalent, key selection criteria include AEC-Q101 qualification, bidirectional clamping behavior, 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT assembly on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector, responding within <1 ps to transients induced by inductive switching or ESD events. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low leakage (<1.0 µA at VWM), while the bidirectional configuration enables symmetric suppression on AC-coupled or floating lines without polarity constraints.
The SMB8J40CAHE3/5B is rated for 800 W peak pulse power under standardized 10/1000 µs waveform conditions, with thermal resistance of 72 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead). It meets MSL Level 1 per J-STD-020 and supports lead-free reflow up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 44.4 V / 49.1 V at 1.0 mA test current - defines reliable breakdown threshold window |
| VC @ IPPM | 64.5 V at 12.4 A - clamping voltage limiting downstream IC stress during 10/1000 µs surge |
| PPPM | 800 W - peak transient energy absorption capability under standard waveform |
| ID @ VWM | ≤1.0 µA - ultra-low leakage preserving signal integrity in high-impedance circuits |
| TJ max | +150 °C - enables operation in under-hood automotive and industrial ambient environments |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling and HTRB |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Both terminals conduct identically during overvoltage events; no cathode band marking required |
| Case (body) | Thermal and mechanical interface | Plastic body with UL 94 V-0 rating; mounted on 5.0 mm × 5.0 mm copper pads for optimal thermal dissipation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and ADAS sensor interfaces |
| Glass-passivated junction | Ensures long-term VBR stability and reduced parameter drift across temperature and life cycles |
| MSL Level 1 | Unlimited floor life; compatible with standard SMT reflow profiles up to 260 °C peak |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a) |
| Matte tin-plated leads | Guarantees solderability per J-STD-002 and whisker resistance per JESD 201 Class 2 |
Applications
| Automotive Sensor Protection | Industrial I/O Port Protection |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and inductive kickback in 12 V vehicle systems. IC Role / Device Role / Timing Role: Bidirectional shunt clamp absorbing >800 W surges while holding line voltage ≤64.5 V during transients. Use Value: Prevents damage to 3.3 V/5 V microcontrollers and signal conditioners without adding series impedance or propagation delay. |
Use Scenario: Safeguarding PLC digital input modules and RS-485 transceivers against field-wiring surges and ground loop transients in factory automation. IC Role / Device Role / Timing Role: Fast-response TVS placed at connector entry point to divert surge current away from protected ICs. Use Value: Maintains system uptime by eliminating false triggering and latch-up caused by 1 kV/500 A surge events. |
| Consumer Power Adapter Interface | Telecom Line Card Surge Suppression |
|
Use Scenario: Input-stage protection for USB-C PD adapters and AC/DC front-ends exposed to lightning-induced surges on mains-connected outputs. IC Role / Device Role / Timing Role: Primary-level TVS clamping common-mode transients before they reach secondary-side controllers and optocouplers. Use Value: Enables compliance with IEC 61000-4-5 Level 3 (2 kV line-earth) without oversized MOVs or complex multi-stage designs. |
Use Scenario: Protecting Ethernet PHYs and DSL line drivers in central office equipment subjected to induced surges from nearby power lines. IC Role / Device Role / Timing Role: Bidirectional clamp on differential pairs, suppressing both longitudinal and transverse mode transients. Use Value: Preserves signal fidelity up to 100 MHz due to low junction capacitance (<100 pF at 0 V) and minimal parasitic inductance. |
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-E3/5B | Same SMB package and 40 V VWM, but lower PPPM (600 W) and higher VC (69.4 V at 8.6 A) | Limited to lower-energy transients; not AEC-Q101 qualified | Select when cost sensitivity outweighs automotive qualification or 800 W surge margin |
| SMCJ40CAHE3_A/H | Higher-power SMC (DO-214AB) package with 1500 W PPPM and same VWM/VC specs | Requires larger PCB footprint (7.11 mm × 6.22 mm vs. 4.57 mm × 3.94 mm) | Choose when system-level surge requirements exceed 800 W or thermal budget demands lower RθJA |
Compared with SMBJ40CA-E3/5B and SMCJ40CAHE3_A/H, the SMB8J40CAHE3/5B uniquely balances AEC-Q101 compliance, 800 W surge capacity, and compact SMB footprint - making it optimal for space-constrained automotive and industrial edge nodes where qualification and power density are jointly critical.
Availability
SMB8J40CAHE3/5B is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom line interface designs requiring stable component supply, AEC-Q101 assurance, and consistent 800 W transient immunity.
Supply support for SMB8J40CAHE3/5B 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 performance.
The SMB8JxxCA family targets high-density, high-reliability transient suppression in automotive and industrial environments - engineered for robustness under repeated surge stress and extended temperature operation.
FAQ
What is the clamping voltage of SMB8J40CAHE3/5B at its rated peak pulse current?
The SMB8J40CAHE3/5B has a maximum clamping voltage (VC) of 64.5 V at 12.4 A peak pulse current (IPPM), measured under the standardized 10/1000 µs waveform. This value ensures protected downstream circuitry remains below safe voltage thresholds during surge events, directly supporting design margin calculations for 3.3 V and 5 V logic interfaces.
Is SMB8J40CAHE3/5B qualified for automotive applications?
Yes, SMB8J40CAHE3/5B is AEC-Q101 qualified, verified through temperature cycling, high-temperature reverse bias, and accelerated life testing. The HE3 suffix explicitly denotes this qualification, enabling use in engine control, body electronics, and ADAS subsystems where automotive-grade reliability is mandatory.
What is the thermal resistance of SMB8J40CAHE3/5B, and how does it affect layout?
SMB8J40CAHE3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W and junction-to-lead (RθJL) of 20 °C/W. To achieve rated 800 W pulse power, the datasheet specifies mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal - underscoring the need for adequate copper area and thermal vias in PCB layout.
How does SMB8J40CAHE3/5B differ from unidirectional variants like SMB10J40AHE3/5B?
SMB8J40CAHE3/5B is bidirectional with symmetric clamping in both polarities, whereas SMB10J40AHE3/5B is unidirectional and conducts only in reverse bias. The "C" in SMB8J40CAHE3/5B denotes bidirectionality, making it suitable for AC lines or floating signals; SMB10J40AHE3/5B is used where polarity is fixed and forward conduction must be blocked.
What packaging and reel options are available for SMB8J40CAHE3/5B?
SMB8J40CAHE3/5B ships in 13" diameter plastic tape and reel with a base quantity of 3200 units (suffix /5B). It uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and meets JESD 201 Class 2 whisker resistance - ensuring compatibility with high-volume SMT assembly and RoHS-compliant manufacturing.
SMB8J40CAHE3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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)
SMB8J40CAHE3/5B FAQ
1.How can I place an order for SMB8J40CAHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J40CAHE3/5B 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 SMB8J40CAHE3/5B reliable?
The price and inventory of SMB8J40CAHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J40CAHE3/5B is usually 5 days.
3.What payment methods are accepted for SMB8J40CAHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J40CAHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J40CAHE3/5B?
SMB8J40CAHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J40CAHE3/5B 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 SMB8J40CAHE3/5B?
For technical support, including SMB8J40CAHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J40CAHE3/5B requirements.
6.How does Aetrix verify that SMB8J40CAHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMB8J40CAHE3/5B 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 SMB8J40CAHE3/5B meets industry standards.
7.What is the process for return or replacement of SMB8J40CAHE3/5B?
All SMB8J40CAHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J40CAHE3/5B, 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 SMB8J40CAHE3/5B part is unused and in its original packaging.
Return procedure for SMB8J40CAHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J40CAHE3/5B Tags
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