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Vishay General Semiconductor - Diodes Division SM6T18CAHM3_A/I
- Part No.:
- SM6T18CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T18CAHM3_A/I.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,957
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Product details
Overview
SM6T18CAHM3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, rated for 18 V standoff voltage (VWM), 25.2 V clamping voltage (VC) at 24 A peak pulse current, and 600 W peak pulse power with 10/1000 μs waveform. It provides robust ESD and surge protection for automotive sensor signal lines, industrial I/O ports, and power supply rails.
For engineers reviewing the SM6T18CAHM3_A/I datasheet, SM6T18CAHM3_A/I pinout, SM6T18CAHM3_A/I application, or SM6T18CAHM3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, low clamping ratio (VC/VWM ≈ 1.4), and SMB package compatibility with automated SMT assembly.
Technical Context
The SM6T18CAHM3_A/I operates as a symmetrical avalanche diode, conducting in both directions when reverse voltage exceeds its breakdown threshold of 17.1–18.9 V (VBR at 1 mA). Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 μA at 15.3 V).
Designed for transient suppression per IEC 61000-4-2 (ESD) and IEC 61000-4-5 (surge), it delivers 25.2 V clamping at 24 A (10/1000 μs), with thermal resistance RθJA = 100 °C/W and maximum junction temperature of +150 °C. The HM3 suffix confirms halogen-free, RoHS-compliant, AEC-Q101 qualified construction.
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 - Confirmed bidirectional avalanche breakdown range |
| VC @ IPPM | 25.2 V at 24 A (10/1000 μs) - Clamping voltage limiting downstream circuit stress |
| PPPM | 600 W - Peak transient energy absorption capacity under standard surge waveform |
| ID @ VWM | <1 μA - Ultra-low leakage preserving signal integrity in high-impedance circuits |
| TJ max. | +150 °C - Enables operation in under-hood automotive and industrial ambient environments |
| Package | SMB (DO-214AA) - Standard surface-mount outline with 5.59 mm × 4.06 mm footprint |
Pinout & Package
SMB (DO-214AA) package: molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1, LF peak 260 °C. Bidirectional device - no polarity marking on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (reverse bias) | One terminal of symmetrical PN junction; conducts during positive or negative transients |
| Cathode | Transient current exit (reverse bias) | Second terminal of symmetrical PN junction; identical electrical role to Anode in bidirectional mode |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables protection against severe lightning-induced surges per IEC 61000-4-5 Level 4 |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, HTRB, and mechanical shock |
| Halogen-free & RoHS-compliant | Meets automotive OEM environmental requirements and JEDEC JESD201 Class 2 whisker resistance |
| Low clamping ratio (VC/VWM ≈ 1.4) | Minimizes overvoltage exposure to protected ICs without excessive derating margin |
| MSL Level 1, 260 °C reflow compatible | Supports lead-free PCB assembly without moisture sensitivity concerns or baking requirements |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between signal line and ground, absorbing transients before they reach sensitive front-end amplifiers or microcontrollers. Use Value: Prevents latch-up or permanent damage to automotive-grade MCUs by limiting transient voltage to ≤25.2 V during 24 A surges. | Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to inductive switching noise from solenoids and contactors. IC Role / Device Role / Timing Role: Parallel-connected TVS across input terminals to shunt fast-rising voltage spikes (>1 kV/μs) to ground. Use Value: Maintains functional safety integrity by ensuring input logic states remain valid during 600 W surge events without system reset. |
| Consumer Power Adapter ESD Protection | Telecom Line Interface Protection |
Use Scenario: Shielding USB-C PD controller and voltage monitoring circuits in wall adapters from user-handling ESD (±8 kV contact discharge). IC Role / Device Role / Timing Role: Low-capacitance (typ. <100 pF) bidirectional clamp on VBUS and CC lines, responding within nanoseconds. Use Value: Passes IEC 61000-4-2 Level 4 without degrading USB communication timing or causing false disconnects. | Use Scenario: Front-end surge suppression on Ethernet PHY or DSL line drivers interfacing with unshielded outdoor cabling. IC Role / Device Role / Timing Role: Primary protection stage before GDT or polymer PTC, handling repetitive 10/1000 μs surges up to 600 W. Use Value: Extends mean time between failures (MTBF) of telecom equipment by limiting clamping voltage to 25.2 V during multi-kA induced surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18CA | Same VWM (15.3 V), lower PPPM (400 W), SMA package (smaller thermal mass) | Limited to lower-energy transients; unsuitable for automotive load dump per ISO 7637-2 Pulse 5a | Select SM6T18CAHM3_A/I when 600 W rating and AEC-Q101 qualification are mandatory |
| 1.5KE18CA | Higher VWM (15.3 V), same VC (25.2 V), but DO-204AC (DO-15) through-hole package | Requires manual or wave soldering; incompatible with high-density SMT layouts | Choose SM6T18CAHM3_A/I for automated production, space-constrained PCBs, and automotive SMT compliance |
Compared with SMAJ18CA and 1.5KE18CA, the SM6T18CAHM3_A/I offers superior surge handling (600 W vs. 400 W or through-hole-limited thermal dissipation), guaranteed AEC-Q101 qualification, and SMB footprint optimized for modern automotive and industrial SMT lines - making it the preferred choice where reliability, manufacturability, and regulatory compliance converge.
Availability
SM6T18CAHM3_A/I is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC I/O protection, and telecom line interface applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SM6T18CAHM3_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, MOSFETs, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SM6T Series is engineered for high-reliability transient suppression in harsh environments, targeting automotive, industrial, and telecom systems where robustness against ESD, lightning, and inductive switching surges is non-negotiable.
FAQ
What does the "HM3" suffix indicate in SM6T18CAHM3_A/I?
The HM3 suffix in SM6T18CAHM3_A/I denotes halogen-free, RoHS-compliant construction with full AEC-Q101 qualification - confirming compliance with automotive reliability standards including temperature cycling, highly accelerated life testing (HALT), and mechanical shock. This distinguishes it from commercial-grade M3 or E3 variants and validates its use in under-hood and safety-critical applications.
Is SM6T18CAHM3_A/I unidirectional or bidirectional?
SM6T18CAHM3_A/I is a bidirectional TVS diode, as confirmed by the "CA" suffix in its part number and its symmetrical electrical characteristics: identical VBR min/max (17.1–18.9 V), VC (25.2 V), and ID (<1 μA) in both polarities. It has no cathode band marking, consistent with Vishay's specification for bidirectional devices in the SM6T Series.
What is the clamping voltage of SM6T18CAHM3_A/I at rated peak pulse current?
The clamping voltage (VC) of SM6T18CAHM3_A/I is 25.2 V when subjected to its rated peak pulse current of 24 A under the standardized 10/1000 μs waveform. This value is measured per Figure 1 in Vishay Document 88385 and defines the maximum voltage imposed on protected circuitry during worst-case surge events.
Does SM6T18CAHM3_A/I meet automotive qualification standards?
Yes, SM6T18CAHM3_A/I meets AEC-Q101 qualification requirements, as explicitly stated in Vishay's ordering information and mechanical data sections. The HM3 suffix certifies qualification for automotive applications, including validation for high-temperature operation (TJ up to +150 °C), thermal cycling, and humidity testing - essential for engine control, ADAS, and body electronics.
What is the thermal resistance of SM6T18CAHM3_A/I, and how does it affect layout?
SM6T18CAHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe junction temperatures during repeated surges, PCB layout must adhere to Vishay's recommended pad dimensions and avoid excessive trace length or narrow traces that increase thermal impedance - critical for sustained reliability in automotive and industrial use.
SM6T18CAHM3_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:
- -
- Bidirectional Channels:
- 1
- 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)
SM6T18CAHM3_A/I FAQ
1.How can I place an order for SM6T18CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T18CAHM3_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 SM6T18CAHM3_A/I reliable?
The price and inventory of SM6T18CAHM3_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 SM6T18CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SM6T18CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T18CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T18CAHM3_A/I?
SM6T18CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T18CAHM3_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 SM6T18CAHM3_A/I?
For technical support, including SM6T18CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T18CAHM3_A/I requirements.
6.How does Aetrix verify that SM6T18CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SM6T18CAHM3_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 SM6T18CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SM6T18CAHM3_A/I?
All SM6T18CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6T18CAHM3_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 SM6T18CAHM3_A/I part is unused and in its original packaging.
Return procedure for SM6T18CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T18CAHM3_A/I Tags
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