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Vishay General Semiconductor - Diodes Division SM6T18AHM3_B/H
- Part No.:
- SM6T18AHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T18AHM3_B/H.pdf
- Description:
- 600W,18V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:6,095
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Product details
Overview
SM6T18AHM3_B/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features 18 V standoff voltage (VWM), 25.2 V max clamping voltage at 24 A peak pulse current, 600 W peak pulse power (10/1000 μs), and AEC-Q101 qualification for automotive use.
For engineers reviewing the SM6T18AHM3_B/H datasheet, SM6T18AHM3_B/H pinout, SM6T18AHM3_B/H application, or SM6T18AHM3_B/H equivalent, key selection criteria include clamping performance under 10/1000 μs surge, unidirectional polarity with cathode band marking, halogen-free RoHS compliance, and suitability for automotive-grade ESD and load-dump protection in compact surface-mount layouts.
Technical Context
This TVS diode operates as a unidirectional clamping device with a specified breakdown voltage range of 17.1–18.9 V at 1 mA test current and a maximum reverse leakage of 1.0 μA at 15.3 V standoff. Its low-inductance SMB package enables fast response to transients while maintaining thermal resistance of 100 °C/W junction-to-ambient.
The device delivers 600 W peak pulse power handling per 10/1000 μs waveform, with clamping voltage stabilized at 25.2 V up to 24 A IPPM, and supports operating junction temperatures from –65 °C to +150 °C. It meets JESD201 Class 2 whisker resistance and MSL Level 1 reflow compatibility (260 °C peak).
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 predictable breakdown onset across production lot |
| VC @ IPPM | 25.2 V at 24 A (10/1000 μs) - Defines worst-case voltage seen by protected circuit during surge |
| PPPM | 600 W - Sustains high-energy transients without failure under standardized waveform |
| TJ max | +150 °C - Enables reliable operation in under-hood automotive environments |
| Package | SMB (DO-214AA) - Industry-standard surface-mount footprint with 0.220" x 0.130" pad layout |
| AEC-Q101 | Qualified - Validated for automotive electronics per stress-test requirements |
Pinout & Package
SMB (DO-214AA) package: molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, cathode indicated by band marking on unidirectional variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path | Connected to lower-potential side (e.g., ground or return) in unidirectional clamp configuration |
| Cathode | Reverse-biased clamping node | Connected to protected line (e.g., 12 V rail or sensor output); band-marked end |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Withstands ISO 7637-2 Pulse 1/2a/5a load-dump surges in automotive ECUs without degradation |
| Low clamping voltage (25.2 V) | Protects 16 V-rated downstream ICs (e.g., CAN transceivers, microcontrollers) during 24 A transients |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets automotive OEM material restrictions and end-of-life recycling requirements |
| MSL Level 1, 260 °C peak reflow | Compatible with standard lead-free SMT assembly without moisture sensitivity concerns |
| Glass passivated junction | Ensures stable leakage and breakdown characteristics over temperature and lifetime |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed control modules from load-dump transients up to 35 V and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed between power input and ground plane. Use Value: Limits voltage excursion to ≤25.2 V during 24 A surge, preventing latch-up or gate oxide damage in PMICs and MCUs. | Use Scenario: Safeguarding analog outputs of pressure/temperature sensors exposed to cable discharge events in factory automation. IC Role / Device Role / Timing Role: Fast-response shunt protector on 4–20 mA or 0–10 V signal lines. Use Value: Clamps ESD (IEC 61000-4-2) and inductive switching spikes within 1 ns, preserving signal integrity below 1% error band. |
| Consumer USB Power Input Protection | Telecom DC Feeder Line Protection |
Use Scenario: Securing 5 V USB-C power inputs in portable devices against hot-plug overshoot and adapter faults. IC Role / Device Role / Timing Role: Standoff-clamp TVS on VBUS line upstream of USB PD controller. Use Value: Maintains 15.3 V working voltage margin while clamping 10/1000 μs surges to 25.2 V, avoiding false overvoltage shutdowns. | Use Scenario: Shielding -48 V DC telecom feeder lines from lightning-induced surges in remote radio units. IC Role / Device Role / Timing Role: Primary surge suppression stage before DC-DC converter input filter. Use Value: Absorbs 600 W transient energy without thermal runaway, enabling single-stage protection architecture with reduced BOM count. |
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 | Same SMB package, 18 V VWM, but 400 W PPPM rating and non-AEC-Q101 qualified | Limited to commercial/industrial use; not validated for automotive temperature cycling or humidity testing | Select when cost sensitivity outweighs automotive qualification requirements |
| SMCJ18A | Higher 1500 W PPPM, larger SMC (DO-214AB) package, same VWM and clamping | Requires PCB area increase (~2.5× footprint); suited for higher-energy industrial surge zones | Choose where system-level surge immunity exceeds ISO 7637-2 Level IV and board space permits |
Compared with SMAJ18A and SMCJ18A, SM6T18AHM3_B/H uniquely balances automotive qualification, compact SMB footprint, and 600 W surge capacity-making it optimal for space-constrained ECU designs requiring OEM-compliant reliability without package redesign.
Availability
SM6T18AHM3_B/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, consumer USB power inputs, and telecom DC feeder lines requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SM6T18AHM3_B/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, MOSFETs, and protection devices with emphasis on reliability 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 and AEC-Q101 compliance are mandatory design requirements.
FAQ
What is the clamping voltage of SM6T18AHM3_B/H under a 10/1000 μs surge?
The SM6T18AHM3_B/H has a maximum clamping voltage (VC) of 25.2 V when subjected to its rated peak pulse current of 24 A using the 10/1000 μs waveform. This value is measured per Figure 1 in the Vishay datasheet 88385 and defines the upper voltage limit imposed on protected circuits during standardized surge events. The SM6T18AHM3_B/H maintains this clamping performance across its qualified operating temperature range.
Is SM6T18AHM3_B/H suitable for automotive applications?
Yes, SM6T18AHM3_B/H is AEC-Q101 qualified, as confirmed by its HM3 suffix and documentation in Vishay's SM6T series datasheet (Rev. 09-Jan-2024). It undergoes stress testing for temperature cycling, humidity, and mechanical shock per automotive standards. The SM6T18AHM3_B/H is explicitly recommended for engine control units, body electronics, and ADAS modules where transient immunity and long-term reliability are critical.
What does the "HM3" suffix indicate in SM6T18AHM3_B/H?
The "HM3" suffix in SM6T18AHM3_B/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's ordering information table, HM3 parts meet JESD201 Class 2 whisker resistance and MSL Level 1 reflow profile (260 °C peak). The "B/H" indicates 7" tape-and-reel packaging with 750-unit quantity. The SM6T18AHM3_B/H thus satisfies both environmental and automotive reliability mandates.
How does SM6T18AHM3_B/H differ from bidirectional variants like SM6T18CA?
SM6T18AHM3_B/H is unidirectional, with polarity marked by a cathode band and intended for DC line protection where forward conduction must be blocked. In contrast, SM6T18CA is bidirectional, lacks polarity marking, and clamps symmetrically in both directions-suitable for AC signal lines or differential buses. The SM6T18AHM3_B/H cannot substitute for SM6T18CA in AC-coupled applications due to its asymmetric conduction behavior.
What is the thermal resistance of SM6T18AHM3_B/H, and how does it affect layout?
The SM6T18AHM3_B/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads per terminal, as specified in the Vishay datasheet. This value assumes minimum recommended pad layout; reducing pad size increases thermal impedance and risks exceeding the +150 °C max junction temperature during repeated surges. Proper PCB copper area is essential for sustained power dissipation in the SM6T18AHM3_B/H.
SM6T18AHM3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- SM6T, TransZorb®
- Packaging:
- Bulk
- 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/H FAQ
1.How can I place an order for SM6T18AHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T18AHM3_B/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_B/H reliable?
The price and inventory of SM6T18AHM3_B/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_B/H is usually 5 days.
3.What payment methods are accepted for SM6T18AHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T18AHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T18AHM3_B/H?
SM6T18AHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T18AHM3_B/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_B/H?
For technical support, including SM6T18AHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T18AHM3_B/H requirements.
6.How does Aetrix verify that SM6T18AHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SM6T18AHM3_B/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_B/H meets industry standards.
7.What is the process for return or replacement of SM6T18AHM3_B/H?
All SM6T18AHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SM6T18AHM3_B/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_B/H part is unused and in its original packaging.
Return procedure for SM6T18AHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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