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Vishay General Semiconductor - Diodes Division SM6T18AHM3_A/I
- Part No.:
- SM6T18AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T18AHM3_A/I.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,181
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Product details
Overview
SM6T18AHM3_A/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for circuit protection against ESD and inductive switching transients. It features 18 V breakdown voltage (VBR = 17.1–18.9 V at IT = 1.0 mA), 15.3 V stand-off voltage (VWM), 25.2 V clamping voltage (VC) at 24.0 A peak pulse current, and 600 W peak pulse power rating with 10/1000 μs waveform - deployed on automotive sensor signal lines and MOSFET gate drivers.
For engineers reviewing the SM6T18AHM3_A/I datasheet, SM6T18AHM3_A/I pinout, SM6T18AHM3_A/I application, or SM6T18AHM3_A/I equivalent, key selection criteria include verified clamping performance under 24 A surge, AEC-Q101 qualification status, halogen-free RoHS compliance, SMB thermal resistance (RθJA = 100 °C/W), and cathode-band polarity marking for unidirectional orientation.
Technical Context
The SM6T18AHM3_A/I operates as a unidirectional avalanche diode with glass-passivated junction, optimized for low-inductance transient suppression in high-speed signal paths. Its clamping behavior is defined by a 10/1000 μs waveform test condition, and it exhibits 1.0 μA maximum reverse leakage at VWM = 15.3 V, ensuring minimal standby power loss in protected circuits.
Thermally, it supports operation from −65 °C to +150 °C junction temperature, with RθJL = 20 °C/W enabling effective heat transfer to PCB copper pads. The device is qualified to AEC-Q101 and manufactured with halogen-free, RoHS-compliant materials per suffix HM3.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 17.1 V / 18.9 V at 1.0 mA - defines precise avalanche initiation threshold for reliable overvoltage triggering |
| VWM | 15.3 V - maximum continuous reverse operating voltage before leakage exceeds 1.0 μA |
| VC @ IPPM | 25.2 V at 24.0 A (10/1000 μs) - actual clamped voltage seen by protected IC during worst-case surge |
| PPPM | 600 W - peak transient power handling capability without failure under standardized surge waveform |
| RθJA | 100 °C/W - thermal resistance from junction to ambient, critical for derating above 25 °C ambient |
| TJ max | +150 °C - maximum allowable junction temperature, supporting under-hood automotive deployment |
| AEC-Q101 | Qualified - validated reliability for automotive electronics per stress-test requirements |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, with matte tin-plated leads solderable per J-STD-002. Cathode identified by black band on case end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of protected line; enables reverse-biased operation during transients |
| Cathode | Avalanche clamping terminal | Marked with band; ties to higher-potential rail or signal line to clamp positive transients to ground-referenced path |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Enables robust protection against ISO 7637-2 Pulse 1/2a/5a surges without degradation in SMB footprint |
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity stress |
| Low inductance design | Minimizes voltage overshoot during fast-rising transients (e.g., <1 ns rise time ESD events) |
| MSL Level 1 (260 °C) | Supports lead-free reflow assembly without popcorn or delamination risk |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive use including engine control units, ADAS sensors, and body electronics |
Applications
| Automotive Sensor Protection | MOSFET Gate Driver Protection |
|---|---|
Use Scenario: Protecting LIN/CAN bus-connected temperature and pressure sensors in engine compartments exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamping positive transients on sensor supply or signal lines to prevent latch-up or oxide damage in analog front-ends. Use Value: Clamps to 25.2 V at 24 A while maintaining 15.3 V stand-off, preserving sensor accuracy and enabling AEC-Q101-compliant system certification. | Use Scenario: Safeguarding high-side N-channel MOSFET gates driven by microcontrollers in 12 V automotive power distribution modules. IC Role / Device Role / Timing Role: Suppressing inductive kickback from relay coils or solenoid loads that couple into gate drive traces. Use Value: Limits gate-source voltage to ≤25.2 V during 600 W surges, preventing gate oxide rupture and ensuring MOSFET reliability over 100k+ cycles. |
| Industrial PLC I/O Protection | Consumer Power Adapter ESD Guard |
Use Scenario: Shielding digital input channels on programmable logic controllers interfacing with 24 V DC field sensors subject to wiring-induced transients. IC Role / Device Role / Timing Role: Fast-response unidirectional clamping element placed between field wiring and optocoupler input stage. Use Value: Delivers sub-100 ps response with 1.0 μA leakage at 15.3 V, minimizing false triggering and maintaining signal integrity across 0–10 kHz input bandwidth. | Use Scenario: Adding secondary-level ESD immunity to USB-C power delivery paths in wall adapters rated for 5 V/3 A output. IC Role / Device Role / Timing Role: Secondary TVS on VBUS line downstream of primary fuse and upstream of buck converter input capacitor. Use Value: Absorbs ±8 kV contact discharge per IEC 61000-4-2 without degrading 5.0 W steady-state dissipation capability or altering board layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A-E3/5B | Same SMB package, 18 V VBR, but 400 W PPPM (vs. 600 W); non-AEC-Q101; RoHS-compliant only (not halogen-free) | Limited to commercial-grade industrial or consumer systems without automotive qualification requirements | Select when cost sensitivity outweighs AEC-Q101 need and surge energy is ≤400 W |
| SMCJ18A-HM3 | Higher-power SMC package (1500 W PPPM), same VBR/VWM, identical HM3 halogen-free/AEC-Q101 spec | Used where higher surge margin is required (e.g., battery input rails), but requires larger PCB area and different pad layout | Choose when system-level testing reveals 600 W insufficient and board space allows SMC footprint |
Compared with SMAJ18A-E3/5B and SMCJ18A-HM3, the SM6T18AHM3_A/I uniquely balances 600 W surge capacity, AEC-Q101 qualification, halogen-free compliance, and SMB footprint - making it optimal for space-constrained automotive modules requiring certified reliability without over-engineering.
Availability
SM6T18AHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and consumer power adapter ESD protection requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for SM6T18AHM3_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 is a global leader in discrete semiconductors, specializing in diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, precision, and application-specific validation.
The SM6T Series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where consistent clamping performance, thermal stability, and qualification compliance are mandatory.
FAQ
What is the exact breakdown voltage range for SM6T18AHM3_A/I?
The SM6T18AHM3_A/I has a guaranteed breakdown voltage (VBR) range of 17.1 V to 18.9 V at test current IT = 1.0 mA, measured per JEDEC standards. This tight 10% tolerance ensures predictable clamping onset across production lots and supports accurate system-level overvoltage margining in designs using the SM6T18AHM3_A/I.
Is SM6T18AHM3_A/I qualified for automotive applications?
Yes, SM6T18AHM3_A/I is AEC-Q101 qualified, as confirmed by its HM3 suffix and Vishay's official documentation. This qualification covers stress tests including HTGB, HTRB, TCT, and mechanical shock - validating the SM6T18AHM3_A/I for use in engine control, body electronics, and ADAS subsystems where reliability under thermal and vibration stress is critical.
What does the "_A/I" suffix indicate in SM6T18AHM3_A/I?
The "_A/I" suffix in SM6T18AHM3_A/I denotes packaging configuration: "A" indicates 7-inch tape-and-reel with 750-unit quantity, and "I" specifies 13-inch tape-and-reel with 3200-unit quantity. Both variants share identical electrical, thermal, and qualification characteristics - the SM6T18AHM3_A/I part number reflects the halogen-free, AEC-Q101-qualified SMB TVS diode regardless of reel size.
How does SM6T18AHM3_A/I compare to bidirectional TVS diodes like SM6T18CA?
The SM6T18AHM3_A/I is unidirectional and clamps only positive transients relative to cathode; SM6T18CA is bidirectional and suppresses both polarities. For single-supply systems with grounded references (e.g., 12 V sensor lines), SM6T18AHM3_A/I offers lower leakage and tighter VWM margin. Use SM6T18AHM3_A/I where polarity is known and reverse conduction must be blocked - unlike the SM6T18CA which conducts in both directions.
What is the maximum clamping voltage of SM6T18AHM3_A/I under standard test conditions?
The SM6T18AHM3_A/I has a maximum clamping voltage (VC) of 25.2 V at 24.0 A peak pulse current with a 10/1000 μs waveform, per Vishay's datasheet Figure 1 and Table on page 2. This value represents the highest voltage imposed on the protected circuit during a standardized surge event and is a key parameter used to verify safe operation of downstream components like the SM6T18AHM3_A/I's protected IC or MOSFET.
SM6T18AHM3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- SM6T, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 15.3V
- Voltage - Breakdown (Min):
- 17.1V
- Voltage - Clamping (Max) @ Ipp:
- 25.2V
- Current - Peak Pulse (10/1000µs):
- 24A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SM6T18AHM3_A/I FAQ
1.How can I place an order for SM6T18AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T18AHM3_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 SM6T18AHM3_A/I reliable?
The price and inventory of SM6T18AHM3_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 SM6T18AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SM6T18AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T18AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T18AHM3_A/I?
SM6T18AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T18AHM3_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 SM6T18AHM3_A/I?
For technical support, including SM6T18AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T18AHM3_A/I requirements.
6.How does Aetrix verify that SM6T18AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SM6T18AHM3_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 SM6T18AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SM6T18AHM3_A/I?
All SM6T18AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6T18AHM3_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 SM6T18AHM3_A/I part is unused and in its original packaging.
Return procedure for SM6T18AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T18AHM3_A/I Tags
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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