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Vishay General Semiconductor - Diodes Division SM6T18AHM3_B/I
- Part No.:
- SM6T18AHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T18AHM3_B/I.pdf
- Description:
- 600W,18V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:6,591
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Product details
Overview
SM6T18AHM3_B/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, rated for 18 V standoff voltage (VWM = 15.3 V), 25.2 V clamping voltage at 24 A peak pulse current, 600 W peak pulse power (10/1000 μs), and AEC-Q101 qualified for automotive electronics protection against load dump and ESD transients.
For engineers reviewing the SM6T18AHM3_B/I datasheet, SM6T18AHM3_B/I pinout, SM6T18AHM3_B/I application, or SM6T18AHM3_B/I equivalent, this page delivers verified electrical parameters, automotive-grade qualification status, SMB package thermal and mechanical data, and real-world use cases in power line and sensor interface protection.
Technical Context
The SM6T18AHM3_B/I uses a glass-passivated silicon junction to achieve low clamping ratio (VC/VBR ≈ 1.33) and low dynamic impedance under surge conditions. Its unidirectional polarity enables precise cathode-referenced suppression on DC power rails and signal lines with defined ground reference.
Designed for surface-mount automated placement, it meets J-STD-020 MSL Level 1 (260 °C peak reflow), features matte tin-plated leads, and delivers 100 A non-repetitive forward surge capability (IFSM) - critical for automotive 12 V system load-switching events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 15.3 V - Maximum continuous reverse voltage before significant leakage; sets operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 17.1–18.9 V at 1 mA - Confirmed breakdown onset range; ensures reliable triggering during overvoltage events. |
| VC (Clamping Voltage) | 25.2 V at 24 A (10/1000 μs) - Actual voltage seen by protected circuit during worst-case surge; defines safe IC stress level. |
| PPPM (Peak Pulse Power) | 600 W - Sustained energy absorption capacity for standardized lightning/surge waveforms per IEC 61000-4-5. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments. |
| RθJA | 100 °C/W - Thermal resistance from junction to ambient; informs PCB pad design for thermal reliability. |
| AEC-Q101 Qualified | Yes - Validated for automotive electronic modules per stress test requirements including HTOL, TCT, and ESD. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, with cathode band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink terminal | Connected to protected line; conducts transient current to ground when V > VBR. |
| Anode | Reference/ground return path | Typically tied to system ground or low-impedance return plane; completes clamping current path. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables robust protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 surges without derating. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive powertrain, body control, and ADAS modules requiring long-term reliability under thermal cycling. |
| Low clamping voltage (25.2 V @ 24 A) | Keeps downstream 24 V-rated components like MCUs and CAN transceivers within safe operating area during transients. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without moisture-related popcorning or delamination risks. |
| Glass-passivated junction | Ensures stable VBR over time and temperature; reduces parameter drift in harsh automotive environments. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Suppressing load-dump transients on 12 V battery-fed ECUs in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor to clamp spikes up to 35 V. Use Value: Prevents damage to LDOs and microcontrollers during alternator field-cutoff events per ISO 16750-2. |
Use Scenario: Protecting analog output lines of pressure/temperature sensors in factory automation systems. IC Role / Device Role / Timing Role: Bidirectional-capable but used unidirectionally across 24 V supply and signal return to absorb ESD and switching noise. Use Value: Maintains ±0.1% measurement accuracy by limiting transient-induced offset shifts in precision op-amp front-ends. |
| Telecom DC Power Input Protection | Consumer USB-C Power Delivery Line Protection |
Use Scenario: Guarding primary-side DC/DC converter inputs in PoE-powered network switches. IC Role / Device Role / Timing Role: TVS mounted at board edge on 48 V input rail to absorb induced surges from Ethernet cabling. Use Value: Enables compliance with IEC 61000-4-5 Level 3 (2 kV line-earth) without additional series impedance. |
Use Scenario: Clamping voltage excursions on VBUS lines during hot-plug events in portable docking stations. IC Role / Device Role / Timing Role: Fast-response unidirectional suppressor between USB-C connector and buck controller input. Use Value: Limits VBUS overshoot to <28 V during 100 V/1 Ω contact bounce, preserving USB PD controller integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A-E3/5B | Same SMB package, 18 V VWM, but lower PPPM (400 W); not AEC-Q101 qualified. | Limited to commercial-grade industrial or consumer applications; unsuitable for automotive under-hood use. | Select when cost sensitivity outweighs automotive qualification and 600 W surge margin. |
| 1.5SMC18A | Higher-power SMC package (1500 W PPPM), same VWM/VBR specs; larger footprint (7.11 × 6.22 mm vs. 4.57 × 3.94 mm). | Used where higher surge energy handling is required and PCB space allows larger package. | Choose when system-level surge testing exceeds IEC 61000-4-5 Level 4 and SMB thermal limits are exceeded. |
Compared with SMAJ18A-E3/5B and 1.5SMC18A, the SM6T18AHM3_B/I uniquely balances AEC-Q101 qualification, 600 W surge capability, and compact SMB footprint - making it optimal for space-constrained automotive modules needing validated reliability.
Availability
SM6T18AHM3_B/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, telecom power supplies, and USB-C PD systems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SM6T18AHM3_B/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, MOSFETs, and protection devices with emphasis on high-reliability, automotive-qualified, and industry-standard solutions.
The SM6T Series was developed specifically for robust transient suppression in automotive and industrial power systems, combining AEC-Q101 qualification, low-clamp performance, and automated assembly compatibility.
FAQ
What is the clamping voltage of SM6T18AHM3_B/I at its rated peak pulse current?
The SM6T18AHM3_B/I has a maximum clamping voltage (VC) of 25.2 V when subjected to a 10/1000 μs waveform at 24 A peak pulse current. This value is measured per JEDEC standards and defines the upper voltage limit imposed on protected circuits during surge events. The SM6T18AHM3_B/I maintains this clamping performance across its qualified operating temperature range.
Is SM6T18AHM3_B/I qualified for automotive applications?
Yes, SM6T18AHM3_B/I is AEC-Q101 qualified - confirmed by the "HM3" suffix denoting halogen-free, RoHS-compliant, and automotive-grade construction. It undergoes stress testing including high-temperature operating life, temperature cycling, and ESD per AEC-Q101 Rev D, making it suitable for engine control, body electronics, and ADAS modules.
What package type does SM6T18AHM3_B/I use, and what are its key mechanical features?
SM6T18AHM3_B/I uses the SMB (DO-214AA) package: 4.57 mm × 3.94 mm outline, 2.20 mm height, with matte tin-plated leads solderable per J-STD-002. It meets UL 94 V-0 flammability rating, MSL Level 1 reflow profile (260 °C peak), and JESD201 Class 2 whisker resistance - all documented in Vishay's 88385 datasheet.
How does SM6T18AHM3_B/I differ from bidirectional variants like SM6T18CA?
SM6T18AHM3_B/I is unidirectional, with cathode marked by a band and intended for DC rail protection where polarity is fixed. In contrast, SM6T18CA is bidirectional (no polarity marking) and used in AC or floating signal lines. Their VBR, VC, and PPPM values are identical, but SM6T18AHM3_B/I cannot replace SM6T18CA in symmetrical surge environments without circuit redesign.
What is the maximum operating junction temperature for SM6T18AHM3_B/I?
The SM6T18AHM3_B/I has a maximum junction temperature (TJ max) of +150 °C, enabling reliable operation in under-hood automotive environments and high-ambient industrial settings. Its RθJA of 100 °C/W requires minimum 5.0 mm × 5.0 mm copper pads per terminal to sustain full power dissipation at elevated ambient temperatures.
SM6T18AHM3_B/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:
- Active
- 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:
- Telecom
- 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_B/I FAQ
1.How can I place an order for SM6T18AHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T18AHM3_B/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_B/I reliable?
The price and inventory of SM6T18AHM3_B/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_B/I is usually 5 days.
3.What payment methods are accepted for SM6T18AHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T18AHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T18AHM3_B/I?
SM6T18AHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T18AHM3_B/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_B/I?
For technical support, including SM6T18AHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T18AHM3_B/I requirements.
6.How does Aetrix verify that SM6T18AHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SM6T18AHM3_B/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_B/I meets industry standards.
7.What is the process for return or replacement of SM6T18AHM3_B/I?
All SM6T18AHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6T18AHM3_B/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_B/I part is unused and in its original packaging.
Return procedure for SM6T18AHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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