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Vishay General Semiconductor - Diodes Division SMB8J40CA-M3/52
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- Part No.:
- SMB8J40CA-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J40CA-M3/52.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,165
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Product details
Overview
SMB8J40CA-M3/52 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 protects automotive sensor signal lines, industrial I/O ports, and telecom interface circuits against ESD and inductive switching transients.
For engineers reviewing the SMB8J40CA-M3/52 datasheet, SMB8J40CA-M3/52 pinout, SMB8J40CA-M3/52 application, or SMB8J40CA-M3/52 equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance (M3 suffix), and compatibility with automated SMT placement on standard 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within <1 ns to transients exceeding its 44.4–49.1 V breakdown range (VBR at 1 mA). Its glass-passivated junction ensures stable leakage (<1 μA at VWM) and low incremental surge resistance, enabling consistent clamping performance across temperature (−55 °C to +150 °C).
The device meets J-STD-020 MSL Level 1 (260 °C peak reflow), supports 100 A non-repetitive forward surge (IFSM), and delivers 800 W peak pulse power in bidirectional configuration-distinct from unidirectional variants like SMB10J40A (1000 W) due to symmetrical avalanche conduction in both polarities.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal line bias margin. |
| VBR min/max | 44.4 V / 49.1 V - Breakdown voltage range at 1 mA test current; ensures reliable turn-on above VWM with process tolerance. |
| VC @ IPPM | 64.5 V - Clamping voltage at 12.4 A peak pulse current (10/1000 μs); limits protected circuit voltage stress during surge. |
| PPPM | 800 W - Peak pulse power rating (bidirectional); determines energy-handling capacity for lightning/inductive transients. |
| ID @ VWM | ≤1.0 μA - Reverse leakage at 40 V; minimizes standby power loss and avoids false triggering in high-impedance nodes. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive and industrial environments. |
| Package | SMB (DO-214AA) - Surface-mount outline with 2.2 mm × 3.9 mm footprint; compatible with standard 7" tape-and-reel (52 code) handling. |
Pinout & Package
SMB8J40CA-M3/52 uses the SMB (DO-214AA) package: molded plastic case with matte tin-plated leads, UL 94 V-0 flammability rating, and no polarity marking (bidirectional device).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Both terminals function identically; bidirectional conduction allows placement without orientation concern on PCB. |
| Case (body) | Thermal and mechanical interface | No electrical connection; thermal resistance RθJA = 72 °C/W (on 0.2" × 0.2" Cu pads) governs power derating above 25 °C. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor interfaces per stress test requirements. |
| Halogen-free & RoHS-compliant (M3) | Meets environmental regulations without compromising surge robustness; suitable for green manufacturing and export compliance. |
| Low-profile SMB package | Height ≤1.75 mm enables use in space-constrained modules such as automotive camera ECUs and IoT edge nodes. |
| Fast response time (<1 ns) | Clamps transients before sensitive ICs (e.g., CAN transceivers, ADCs) experience overvoltage damage. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and single-reflow processing at 260 °C peak, simplifying SMT production flow. |
Applications
| Automotive Sensor Protection | Industrial I/O Port Protection |
|---|---|
Use Scenario: Protecting LIN bus or analog sensor outputs (e.g., pressure, temperature) in vehicle cabin modules from load-dump and ESD events. IC Role / Device Role / Timing Role: Bidirectional shunt clamp absorbing ±1 kV ESD (IEC 61000-4-2) and 40 V/12.4 A surges (ISO 7637-2 Pulse 1/2a). Use Value: Prevents latch-up or gate oxide rupture in downstream op-amps and microcontrollers by limiting voltage to ≤64.5 V during transients. | Use Scenario: Safeguarding RS-485/RS-232 communication ports on PLC backplanes against inductive kickback from relay coils and motor drives. IC Role / Device Role / Timing Role: Voltage-limited transient sink placed directly at connector entry point, before signal conditioning circuitry. Use Value: Maintains data integrity by clamping surges before they distort differential signaling thresholds or damage transceiver inputs. |
| Telecom Interface Protection | Consumer Power Adapter Input |
Use Scenario: Shielding Ethernet PHY magnetics and PoE controller inputs from lightning-induced surges on outdoor network drops. IC Role / Device Role / Timing Role: First-line bidirectional clamp on DC bias lines and data pairs, coordinated with gas discharge tubes for staged protection. Use Value: Enables compliance with ITU-T K.21 basic protection level (4 kV/2 kA) while preserving signal bandwidth via low junction capacitance. | Use Scenario: Suppressing fast-rising transients on AC-DC adapter primary-side rectifier outputs caused by mains switching noise. IC Role / Device Role / Timing Role: Secondary-side TVS placed after bulk capacitor to protect switching controller ICs from reflected spikes. Use Value: Extends controller lifetime by limiting voltage overshoot to 64.5 V, avoiding overvoltage lockout or internal FET avalanche failure in SMB8J40CA-M3/52. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40CA-M3/52 | Same SMB package, identical VWM (40 V) and VC (64.5 V), but rated for 600 W PPPM (vs. 800 W). | Limited to lower-energy transients; not recommended for ISO 7637-2 Pulse 5a (load dump) where SMB8J40CA-M3/52's 800 W rating is required. | Select SMB8J40CA-M3/52 when protecting against automotive load dump or high-current inductive switching. |
| SMCJ40CA-M3/52 | Larger SMC (DO-214AB) package, same VWM/VC, but higher 1500 W PPPM rating and lower RθJA (35 °C/W). | Requires larger PCB area and different pad layout; better suited for high-power industrial motor drives than space-constrained automotive sensors. | Choose SMB8J40CA-M3/52 for compact designs needing 800 W in SMB footprint; use SMCJ40CA-M3/52 only if thermal headroom or higher surge margin is critical. |
Compared with SMBJ40CA-M3/52 and SMCJ40CA-M3/52, SMB8J40CA-M3/52 uniquely balances 800 W surge capability, AEC-Q101 qualification, and SMB footprint-making it optimal for automotive and industrial applications demanding high reliability in minimal board space.
Availability
SMB8J40CA-M3/52 is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom interface protection requiring stable component supply, halogen-free compliance, and AEC-Q101 validation.
Supply support for SMB8J40CA-M3/52 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 series belongs to Vishay's TRANSZORB® TVS portfolio, engineered specifically for high-power-density transient suppression in automotive, industrial, and communications systems where bidirectional clamping and AEC-Q101 compliance are mandatory.
FAQ
What is the peak pulse power rating of SMB8J40CA-M3/52 and under what waveform condition is it specified?
The SMB8J40CA-M3/52 has a peak pulse power rating (PPPM) of 800 W, measured using the standardized 10/1000 μs double-exponential current waveform defined in ANSI/IEEE C62.35. This rating applies to bidirectional operation and assumes mounting on 0.2" × 0.2" copper pads per terminal, with derating above 25 °C ambient per Figure 2 in the datasheet.
Is SMB8J40CA-M3/52 suitable for automotive applications, and what qualification does it hold?
Yes, SMB8J40CA-M3/52 is qualified to AEC-Q101 for automotive use. The "HM3" suffix variant (e.g., SMB8J40CAHM3_B/H) explicitly denotes halogen-free, RoHS-compliant, and AEC-Q101-qualified construction. The M3 suffix in SMB8J40CA-M3/52 confirms halogen-free and RoHS compliance; AEC-Q101 qualification is confirmed for the SMB8JxxCA family per document 88422 revision 09-Jan-2024.
How does the clamping voltage of SMB8J40CA-M3/52 compare to its stand-off and breakdown voltages?
SMB8J40CA-M3/52 has a stand-off voltage (VWM) of 40 V, a breakdown voltage range (VBR) of 44.4–49.1 V at 1 mA, and a maximum clamping voltage (VC) of 64.5 V at 12.4 A peak pulse current. This 24.5 V headroom between VWM and VC ensures robust protection margin while maintaining low leakage (<1 μA) during normal operation.
What is the thermal resistance of SMB8J40CA-M3/52, and how does it affect power derating?
The SMB8J40CA-M3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W when mounted on 0.2" × 0.2" copper pads. This value dictates linear derating of peak pulse power above 25 °C ambient: for example, at 85 °C TA, usable PPPM drops to approximately 560 W per Figure 2, requiring careful thermal design in enclosed enclosures.
Does SMB8J40CA-M3/52 have polarity markings, and how should it be oriented during PCB assembly?
No, SMB8J40CA-M3/52 has no polarity markings because it is a bidirectional TVS diode. Both terminals are functionally identical, allowing placement in either orientation on the PCB without affecting clamping performance-unlike unidirectional variants that require cathode-band alignment.
SMB8J40CA-M3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMB8J40CA-M3/52 FAQ
1.How can I place an order for SMB8J40CA-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J40CA-M3/52 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 SMB8J40CA-M3/52 reliable?
The price and inventory of SMB8J40CA-M3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J40CA-M3/52 is usually 5 days.
3.What payment methods are accepted for SMB8J40CA-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J40CA-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J40CA-M3/52?
SMB8J40CA-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J40CA-M3/52 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 SMB8J40CA-M3/52?
For technical support, including SMB8J40CA-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J40CA-M3/52 requirements.
6.How does Aetrix verify that SMB8J40CA-M3/52 is sourced from the original manufacturer or authorized distributors?
All SMB8J40CA-M3/52 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 SMB8J40CA-M3/52 meets industry standards.
7.What is the process for return or replacement of SMB8J40CA-M3/52?
All SMB8J40CA-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J40CA-M3/52, 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 SMB8J40CA-M3/52 part is unused and in its original packaging.
Return procedure for SMB8J40CA-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J40CA-M3/52 Tags
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