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Vishay General Semiconductor - Diodes Division SM6T18AHM3/H
- Part No.:
- SM6T18AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T18AHM3/H.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,191
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Product details
Overview
SM6T18AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in SMB (DO-214AA) package, with 15.3 V standoff voltage (VWM), 17.1–18.9 V breakdown voltage (VBR at 1 mA), 25.2 V clamping voltage (VC) at 24 A peak pulse current, and 600 W peak pulse power rating per 10/1000 μs waveform. It protects MOSFETs and signal lines in automotive sensor units against inductive switching transients.
For engineers reviewing the SM6T18AHM3/H datasheet, SM6T18AHM3/H pinout, SM6T18AHM3/H application, or SM6T18AHM3/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, 150 °C max junction temperature, low-inductance SMB package, and halogen-free RoHS compliance per HM3 suffix.
Technical Context
This TVS diode operates as a clamping device in reverse-biased configuration, activating when transient voltage exceeds VBR to divert surge current away from protected circuitry. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 μA at VWM).
Designed for high-reliability automotive applications, SM6T18AHM3/H meets AEC-Q101 stress testing requirements and is qualified for use in harsh environments with operating junction temperatures up to +150 °C. The SMB package provides low thermal resistance (RθJL = 20 °C/W) and supports automated placement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15.3 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 17.1 V / 18.9 V at 1 mA - Ensures reliable turn-on above normal operating rail while avoiding false triggering |
| VC @ IPPM | 25.2 V at 24 A - Limits voltage seen by downstream ICs during 10/1000 μs surge events |
| PPPM | 600 W - Sustains high-energy transients common in automotive load-dump and inductive switch-off scenarios |
| TJ max | +150 °C - Enables operation in under-hood automotive environments without derating |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 2.2 mm height and 5.59 mm length for PCB space efficiency |
Pinout & Package
SMB (DO-214AA) package with molded plastic body, matte tin-plated leads solderable per J-STD-002, and cathode band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection in clamping path | Connected to ground or low-impedance return path to complete surge current loop |
| Cathode | High-side connection in clamping path | Connected to protected line; band marking identifies this terminal for correct orientation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Halogen-free & RoHS-compliant (HM3) | Meets automotive environmental standards and end-of-life material restrictions |
| 600 W peak pulse power (10/1000 μs) | Handles typical ISO 7637-2 Pulse 1 and Pulse 2b transients without degradation |
| Low inductance SMB package | Minimizes voltage overshoot during fast-rising transients (<1 ns rise time) |
| MSL Level 1 (260 °C peak reflow) | Compatible with standard lead-free SMT assembly processes without moisture sensitivity concerns |
Applications
| Automotive Sensor Protection | Industrial Motor Drive Inputs |
|---|---|
Use Scenario: Protecting CAN/LIN bus interface ICs and Hall-effect sensors in engine control modules from load-dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between signal line and chassis ground to limit transient overvoltage. Use Value: Prevents latch-up or permanent damage to 5 V/12 V sensor interfaces during ISO 16750-2 tests with 100 V/100 ms surges. | Use Scenario: Safeguarding gate drivers and microcontroller GPIOs connected to relay coils or solenoid actuators in PLC I/O modules. IC Role / Device Role / Timing Role: Fast-response voltage clamp absorbing inductive kickback energy from 24 V DC coils. Use Value: Eliminates need for snubber RC networks while maintaining <25.2 V peak clamping during 100 A/ms turn-off events. |
| Consumer Power Adapter Outputs | Telecom Line Card Surge Protection |
Use Scenario: Secondary-side overvoltage suppression on 12 V/19 V DC outputs of laptop adapters exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Standoff-rated TVS placed across output rails to clamp transients before reaching downstream DC-DC converters. Use Value: Maintains regulated output integrity with 15.3 V VWM margin above nominal 12 V rail and 25.2 V clamping ceiling. | Use Scenario: Primary protection stage for Ethernet PHY interfaces on telecom base station line cards subjected to AC power cross-talk. IC Role / Device Role / Timing Role: First-line transient suppressor on differential pairs, coordinated with GDT or MOV secondary stages. Use Value: Provides sub-100 ns response to 1 kV/μs threats while meeting IEC 61000-4-5 Level 3 (1 kV line-earth) requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A | Same SMB package, 18 V VBR, but only 400 W PPPM; non-AEC-Q101 rated | Limited to commercial-grade industrial or consumer systems without automotive qualification needs | Select when cost sensitivity outweighs AEC-Q101 requirement and surge energy stays below 400 W |
| SMCJ18A | Higher 1500 W PPPM in larger SMC (DO-214AB) package; same VBR range and AEC-Q101 option available | Used where higher surge immunity is required, e.g., battery input protection in ADAS ECUs | Choose when system-level surge testing exceeds 600 W or board layout allows larger footprint |
Compared with SMAJ18A and SMCJ18A, SM6T18AHM3/H delivers optimal balance of automotive qualification, 600 W surge handling, and compact SMB footprint-making it ideal for space-constrained, AEC-Q101–mandated sensor nodes where neither lower-power nor larger-package alternatives meet all three criteria simultaneously.
Availability
SM6T18AHM3/H is available at Aetrix Electronics and suitable for automotive sensor units, industrial motor drive inputs, and telecom line card surge protection requiring stable component supply, halogen-free compliance, and AEC-Q101 qualification.
Supply support for SM6T18AHM3/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, rectifiers, and protection devices with emphasis on reliability, precision, and automotive-grade validation.
The SM6T Series is engineered specifically for robust transient suppression in automotive and industrial environments, combining high surge capability, AEC-Q101 qualification, and standardized SMB packaging for drop-in compatibility across vehicle platforms.
FAQ
What does the "HM3" suffix indicate in SM6T18AHM3/H?
The "HM3" suffix in SM6T18AHM3/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It confirms compliance with automotive environmental standards and validates performance under extended temperature cycling, high-temperature reverse bias, and mechanical shock testing per AEC-Q101 Rev D. This makes SM6T18AHM3/H suitable for under-hood and safety-critical applications where both material content and reliability are mandated.
Is SM6T18AHM3/H unidirectional or bidirectional?
SM6T18AHM3/H is a unidirectional TVS diode, indicated by the absence of "CA" in its part number. Its cathode is marked by a band on the SMB package body, and it conducts only during reverse-bias overvoltage events. Unlike bidirectional variants (e.g., SM6T18CA), SM6T18AHM3/H must be oriented correctly on PCBs to protect positive-going transients on lines referenced to ground.
What is the maximum clamping voltage of SM6T18AHM3/H and at what current?
The maximum clamping voltage (VC) of SM6T18AHM3/H is 25.2 V, measured at a peak pulse current (IPPM) of 24 A using a 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during standardized surge events and is critical for ensuring downstream components remain within their absolute maximum ratings during transient conditions.
Does SM6T18AHM3/H meet JEDEC moisture sensitivity level requirements?
Yes, SM6T18AHM3/H meets MSL Level 1 per J-STD-020, with a maximum peak reflow temperature of 260 °C. This eliminates the need for dry-packaging or baking prior to surface-mount assembly, supporting seamless integration into standard lead-free reflow processes used in automotive electronics manufacturing.
How does the thermal resistance of SM6T18AHM3/H affect PCB layout?
SM6T18AHM3/H has a typical junction-to-lead thermal resistance (RθJL) of 20 °C/W, meaning efficient heat transfer relies on adequate copper pad area (minimum 0.2" × 0.2" per terminal per datasheet). Layouts must provide sufficient thermal relief and avoid narrow traces to prevent localized heating during repetitive surge events, especially in high-ambient-temperature automotive applications.
SM6T18AHM3/H 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:
- Discontinued at Digi-Key
- 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/H FAQ
1.How can I place an order for SM6T18AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T18AHM3/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 SM6T18AHM3/H reliable?
The price and inventory of SM6T18AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T18AHM3/H is usually 5 days.
3.What payment methods are accepted for SM6T18AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T18AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T18AHM3/H?
SM6T18AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T18AHM3/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 SM6T18AHM3/H?
For technical support, including SM6T18AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T18AHM3/H requirements.
6.How does Aetrix verify that SM6T18AHM3/H is sourced from the original manufacturer or authorized distributors?
All SM6T18AHM3/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 SM6T18AHM3/H meets industry standards.
7.What is the process for return or replacement of SM6T18AHM3/H?
All SM6T18AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SM6T18AHM3/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 SM6T18AHM3/H part is unused and in its original packaging.
Return procedure for SM6T18AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T18AHM3/H Tags
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