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Vishay General Semiconductor - Diodes Division SMB8J9.0CAHM3/I
- Part No.:
- SMB8J9.0CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J9.0CAHM3/I.pdf
- Description:
- TVS DIODE 9VWM 15.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,487
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Product details
Overview
SMB8J9.0CAHM3/I 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 a 9.0 V stand-off voltage (VWM), 15.4 V maximum clamping voltage (VC) at 20 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 SMB8J9.0CAHM3/I datasheet, SMB8J9.0CAHM3/I pinout, SMB8J9.0CAHM3/I application, or SMB8J9.0CAHM3/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, and compatibility with 0.2" × 0.2" copper pad layouts per JEDEC standards.
Technical Context
This device operates as a voltage-clamped crowbar during transients, leveraging a glass-passivated silicon junction to achieve sub-nanosecond response time and low incremental surge resistance. Its bidirectional symmetry enables protection of AC-coupled or differential signal paths without polarity constraints.
Rated for -55 °C to +150 °C junction temperature, it meets MSL Level 1 per J-STD-020 and supports reflow up to 260 °C peak. The HM3 suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 qualification for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 9.0 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 10.0 V / 11.1 V at 1.0 mA - ensures reliable breakdown onset within tight tolerance band |
| VC @ IPPM | 15.4 V at 20 A - limits protected circuit voltage during 10/1000 µs surge to safe level |
| PPPM | 800 W - sustains high-energy transients per ISO 7637-2 Pulse 1/2/5a without degradation |
| ID @ VWM | 1.0 µA - negligible leakage current preserves signal integrity in high-impedance nodes |
| TJ max | +150 °C - supports under-hood automotive placement and industrial ambient conditions |
| Package | SMB (DO-214AA) - surface-mount footprint compatible with automated assembly and IPC-7351B land patterns |
Pinout & Package
Two-terminal SMB (DO-214AA) package with no polarity marking for bidirectional operation; terminals are matte tin-plated and solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Identical electrical behavior in both directions - no orientation required during placement |
| Case (cathode band absent) | Thermal and mechanical interface | No cathode marking - bidirectional symmetry eliminates polarity-dependent layout constraints |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TCT, and ESD HBM/MM |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and JEDEC J-STD-201 Class 2 whisker resistance |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes overvoltage exposure during surge events compared to competing TVS devices |
| MSL Level 1 rating | Enables standard SMT reflow without moisture sensitivity concerns or baking preconditioning |
| Glass-passivated junction | Ensures stable leakage and breakdown characteristics across temperature and lifetime |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and inductive switching spikes in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between signal line and ground, absorbing energy before IC input stages. Use Value: Maintains signal integrity below 15.4 V during 20 A surges, preventing latch-up or permanent damage to downstream ASICs. | Use Scenario: Safeguarding PLC digital input modules against field-wiring transients induced by relay coil de-energization or motor contactor switching. IC Role / Device Role / Timing Role: Standoff protector on 24 V DC input lines, conducting only when voltage exceeds 9.0 V. Use Value: Enables robust operation in harsh factory environments where >1 kV fast-rising transients occur repeatedly. |
| USB Port ESD Protection | RS-485 Transceiver Protection |
Use Scenario: Secondary-level surge suppression on USB 2.0 data lines (D+/D−) in automotive infotainment head units. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp limiting differential and common-mode overvoltage. Use Value: Clamps to ≤15.4 V while adding <1 pF parasitic capacitance - preserving signal rise/fall times. | Use Scenario: Protecting half-duplex RS-485 transceivers (e.g., THVD1550) in building automation networks exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Common-mode shunt device across A/B lines referenced to ground. Use Value: Withstands 800 W peak pulse energy per line pair, meeting IEC 61000-4-5 Level 3 immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J9.0CAHE3/I | RoHS-compliant but not halogen-free; lacks HM3 halogen-free certification | Acceptable for commercial/industrial use where halogen-free is not mandated | Select SMB8J9.0CAHM3/I when automotive AEC-Q101 + halogen-free compliance are mandatory |
| SMAJ9.0CA | Lower PPPM (400 W), SMA package (smaller thermal mass), higher RθJA (110 °C/W) | Suitable for lower-energy surges; less robust in sustained thermal stress scenarios | Choose SMB8J9.0CAHM3/I for higher-power surge immunity and automotive thermal cycling endurance |
Compared with SMB8J9.0CAHE3/I and SMAJ9.0CA, SMB8J9.0CAHM3/I delivers superior surge handling (800 W vs. 400–600 W), guaranteed halogen-free construction, and full AEC-Q101 validation - making it the preferred choice for automotive front-end protection where regulatory compliance and thermal margin are critical.
Availability
SMB8J9.0CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, USB port protection, and RS-485 transceiver circuits requiring stable component supply and long-term lifecycle assurance.
Supply support for SMB8J9.0CAHM3/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 is a global leader in discrete semiconductors, specializing in diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMB8J series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-power-density transient suppression in automotive, industrial, and communications infrastructure where AEC-Q101 qualification and precise clamping control are essential.
FAQ
What is the clamping voltage of SMB8J9.0CAHM3/I at its rated peak pulse current?
The SMB8J9.0CAHM3/I has a maximum clamping voltage (VC) of 15.4 V when subjected to its rated 20 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that downstream circuitry remains below this threshold during standardized surge events - a critical parameter for protecting sensitive 12 V or 24 V automotive and industrial ICs.
Is SMB8J9.0CAHM3/I suitable for automotive applications?
Yes, SMB8J9.0CAHM3/I is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction validated for automotive use. It meets requirements for temperature cycling, high-temperature operating life, and ESD robustness - making SMB8J9.0CAHM3/I appropriate for engine control units, body electronics, and ADAS sensor interfaces where reliability under harsh conditions is mandatory.
How does the bidirectional configuration of SMB8J9.0CAHM3/I affect PCB layout?
The SMB8J9.0CAHM3/I has no polarity marking and identical electrical behavior in both directions, eliminating orientation constraints during placement. Unlike unidirectional TVS diodes, SMB8J9.0CAHM3/I can be mounted without regard to anode/cathode alignment - simplifying layout, reducing assembly errors, and enabling symmetric protection on AC-coupled or differential signal lines such as RS-485 or CAN FD.
What is the thermal resistance of SMB8J9.0CAHM3/I, and how does it impact power derating?
SMB8J9.0CAHM3/I has a typical junction-to-lead thermal resistance (RθJL) of 20 °C/W and junction-to-ambient (RθJA) of 72 °C/W when mounted on 0.2" × 0.2" copper pads. These values directly determine safe operating area: above 25 °C ambient, peak pulse power must be linearly derated per Figure 2 in Vishay document 88422 - ensuring SMB8J9.0CAHM3/I maintains integrity during repeated surge events in enclosed enclosures or high-temperature zones.
Does SMB8J9.0CAHM3/I require special handling or moisture precautions before soldering?
No - SMB8J9.0CAHM3/I is rated MSL Level 1 per J-STD-020, meaning it may be stored indefinitely at ≤30 °C/85 % RH and processed using standard reflow profiles up to 260 °C peak without baking or dry-pack requirements. This simplifies manufacturing logistics and eliminates moisture-related defects like popcorning, confirming SMB8J9.0CAHM3/I's suitability for high-volume SMT production lines.
SMB8J9.0CAHM3/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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 9V
- Voltage - Breakdown (Min):
- 10V
- Voltage - Clamping (Max) @ Ipp:
- 15.4V
- Current - Peak Pulse (10/1000µs):
- 51.9A
- 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)
SMB8J9.0CAHM3/I FAQ
1.How can I place an order for SMB8J9.0CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J9.0CAHM3/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 SMB8J9.0CAHM3/I reliable?
The price and inventory of SMB8J9.0CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J9.0CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMB8J9.0CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J9.0CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J9.0CAHM3/I?
SMB8J9.0CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J9.0CAHM3/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 SMB8J9.0CAHM3/I?
For technical support, including SMB8J9.0CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J9.0CAHM3/I requirements.
6.How does Aetrix verify that SMB8J9.0CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMB8J9.0CAHM3/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 SMB8J9.0CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMB8J9.0CAHM3/I?
All SMB8J9.0CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J9.0CAHM3/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 SMB8J9.0CAHM3/I part is unused and in its original packaging.
Return procedure for SMB8J9.0CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J9.0CAHM3/I Tags
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