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Vishay General Semiconductor - Diodes Division SM6T18CAHM3_B/I
- Part No.:
- SM6T18CAHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T18CAHM3_B/I.pdf
- Description:
- 600W,18V,5%,BIDIR, SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:6,059
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Product details
Overview
SM6T18CAHM3_B/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping ESD and surge transients on signal/power 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 operates from −65 °C to +150 °C. It is halogen-free, RoHS-compliant, and AEC-Q101 qualified for automotive electronics protection.
For engineers reviewing the SM6T18CAHM3_B/I datasheet, SM6T18CAHM3_B/I pinout, SM6T18CAHM3_B/I application, or SM6T18CAHM3_B/I equivalent, key selection criteria include bidirectional clamping capability, low clamping voltage under 24 A surge, AEC-Q101 qualification status, SMB package thermal resistance (RθJL = 20 °C/W), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This bidirectional TVS diode uses a glass-passivated silicon junction to provide symmetrical clamping in both polarities, enabling robust protection of AC-coupled or differential signal paths without polarity sensitivity. Its low-inductance SMB package and optimized die geometry support fast response (<1 ns) to transients while maintaining stable breakdown at 20.9–23.1 V (VBR, min/max).
The device meets J-STD-020 MSL Level 1 (260 °C peak reflow), supports 100 A non-repetitive forward surge (IFSM, unidirectional only - not applicable here), and delivers consistent clamping performance across −65 °C to +150 °C junction temperature range with thermal resistance RθJA = 100 °C/W (typ.) and RθJL = 20 °C/W (typ.).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15.3 V - maximum reverse stand-off voltage before significant leakage; defines safe operating window for protected circuit |
| VBR (min/max) | 17.1 V / 18.9 V at 1 mA - precise bidirectional breakdown threshold ensures predictable turn-on during overvoltage events |
| VC @ IPPM | 25.2 V at 24 A (10/1000 μs) - low clamping voltage limits stress on downstream ICs like microcontrollers or sensors |
| PPPM | 600 W - peak pulse power handling capacity for standard lightning/surge waveforms per IEC 61000-4-5 |
| TJ Range | −65 °C to +150 °C - wide junction temperature range enables use in under-hood automotive and industrial environments |
| Package | SMB (DO-214AA) - surface-mount package with 2.20 mm × 3.94 mm footprint, compatible with standard SMT pick-and-place |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; meets UL 94 V-0 flammability rating and JESD 201 Class 2 whisker resistance. Bidirectional construction means no polarity marking - terminals are symmetric and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional conduction path | Both terminals function identically; clamps positive or negative transients equally - no orientation required during placement |
| Case (body) | Thermal and mechanical interface | Non-electrical; provides mechanical anchoring and contributes to heat dissipation via PCB copper pads (0.2" × 0.2") |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable, repeatable breakdown voltage and long-term reliability under repeated surge stress |
| 600 W peak pulse power (10/1000 μs) | Supports IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly laid out with low-inductance traces |
| Low clamping ratio (VC/VBR ≈ 1.33) | Minimizes overvoltage overshoot during clamping - critical for protecting 3.3 V or 5 V logic interfaces |
| Halogen-free & RoHS-compliant (HM3 suffix) | Fulfills environmental compliance requirements for automotive and industrial end equipment without compromising performance |
| MSL Level 1 reflow compatibility | Enables single-pass lead-free reflow assembly at 260 °C peak without moisture-induced damage |
Applications
| Automotive Sensor Protection | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protecting LIN/CAN transceiver inputs and analog sensor outputs (e.g., pressure, temperature) from load-dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt surge energy before it reaches sensitive analog front-ends or communication ICs. Use Value: Maintains signal integrity by limiting transient voltage to ≤25.2 V, preventing latch-up or permanent damage to 5 V tolerant transceivers and ADC inputs. | Use Scenario: Safeguarding differential CAN_H/CAN_L lines against ESD (±8 kV contact) and fast transient bursts in factory automation controllers and motor drives. IC Role / Device Role / Timing Role: Symmetric TVS pair (one per line) providing common-mode and differential-mode surge suppression without affecting bus timing or signal rise/fall characteristics. Use Value: Enables reliable CAN FD operation up to 5 Mbps by preserving signal edge fidelity - clamping occurs within <1 ns with minimal capacitance impact (CJ ≈ 200 pF at 0 V). |
| Consumer USB Port Protection | Telecom DSL Line Interface |
Use Scenario: Shielding USB 2.0 D+/D− data lines in set-top boxes and smart home hubs from human-body-model (HBM) ESD events during plug/unplug cycles. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp placed adjacent to USB connector to divert ESD current away from PHY IC pins. Use Value: Prevents data corruption and PHY latch-up by clamping ±15 kV HBM discharges to <±25.2 V while adding <0.5 ns propagation delay to signal path. | Use Scenario: Protecting ADSL/VDSL line drivers and receivers from lightning-induced surges entering via outdoor telephone wiring in residential gateways and DSLAM modules. IC Role / Device Role / Timing Role: Primary surge arrestor mounted at line interface transformer secondary side to absorb high-energy common-mode transients before reaching codec ICs. Use Value: Withstands 600 W peak pulses without degradation, ensuring >100,000 surge events lifetime per Telcordia GR-1089-CORE requirement. |
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 (larger RθJA = 130 °C/W) | Less suitable for high-repetition surges or compact thermal layouts; requires larger pad area for equivalent power handling | Select when cost is prioritized over peak power margin and board space allows SMA footprint |
| 1.5KE18CA | Higher PPPM (1500 W), axial DO-201 package, slower response due to higher parasitic inductance | Not SMT-compatible; unsuitable for high-speed data lines or dense automotive PCBs requiring automated assembly | Choose only for legacy through-hole designs where 1.5 kW surge margin outweighs layout and assembly constraints |
Compared with SMAJ18CA and 1.5KE18CA, SM6T18CAHM3_B/I offers optimal balance of AEC-Q101 qualification, 600 W surge capacity in compact SMB form factor, and verified low-inductance performance - making it the preferred choice for new automotive and industrial SMT designs requiring production-ready reliability.
Availability
SM6T18CAHM3_B/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial CAN networks, and telecom line interface circuits requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SM6T18CAHM3_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 components.
The SM6T Series is engineered specifically for robust transient suppression in harsh environments - targeting automotive infotainment, body electronics, and industrial control systems where AEC-Q101 validation and stable clamping performance are mandatory.
FAQ
What is the clamping voltage of SM6T18CAHM3_B/I at its rated peak pulse current?
The SM6T18CAHM3_B/I has a maximum clamping voltage (VC) of 25.2 V when subjected to a 10/1000 μs waveform peak pulse current (IPPM) of 24 A. This value is measured under standardized test conditions per JEDEC standards and reflects the upper limit of voltage seen by protected circuitry during surge events - critical for ensuring compatibility with 3.3 V or 5 V logic interfaces downstream.
Is SM6T18CAHM3_B/I suitable for automotive applications?
Yes, SM6T18CAHM3_B/I is AEC-Q101 qualified and manufactured with halogen-free, RoHS-compliant materials (HM3 suffix). It undergoes rigorous stress testing including temperature cycling, high-temperature reverse bias, and ESD verification - meeting automotive requirements for engine control units, ADAS sensors, and infotainment systems operating in ambient temperatures up to 125 °C.
What does the "CA" suffix indicate in SM6T18CAHM3_B/I?
The "CA" suffix in SM6T18CAHM3_B/I denotes a bidirectional configuration - meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., SM6T18A), this version has no cathode marking and functions identically regardless of terminal orientation, making it ideal for AC-coupled or differential signal lines such as CAN, RS-485, or USB.
What is the thermal resistance from junction to lead (RθJL) for SM6T18CAHM3_B/I?
The SM6T18CAHM3_B/I has a typical thermal resistance from junction to lead (RθJL) of 20 °C/W. This low value enables efficient heat transfer from the silicon die to the PCB copper pads during repetitive surge events - especially important in confined spaces like automotive junction boxes where airflow is limited and sustained power dissipation must be managed.
How does the SMB package of SM6T18CAHM3_B/I compare to SMA in terms of surge handling?
The SMB (DO-214AA) package used in SM6T18CAHM3_B/I offers lower parasitic inductance and better thermal performance than SMA (DO-214AC) due to shorter internal leads and optimized die attach. With RθJL = 20 °C/W (vs. ~25 °C/W for SMA) and tighter dimensional control, SM6T18CAHM3_B/I maintains more stable clamping under fast-rising transients - a key advantage for high-speed data line protection in automotive and industrial applications.
SM6T18CAHM3_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:
- -
- 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:
- 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)
SM6T18CAHM3_B/I FAQ
1.How can I place an order for SM6T18CAHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T18CAHM3_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 SM6T18CAHM3_B/I reliable?
The price and inventory of SM6T18CAHM3_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 SM6T18CAHM3_B/I is usually 5 days.
3.What payment methods are accepted for SM6T18CAHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T18CAHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T18CAHM3_B/I?
SM6T18CAHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T18CAHM3_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 SM6T18CAHM3_B/I?
For technical support, including SM6T18CAHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T18CAHM3_B/I requirements.
6.How does Aetrix verify that SM6T18CAHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SM6T18CAHM3_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 SM6T18CAHM3_B/I meets industry standards.
7.What is the process for return or replacement of SM6T18CAHM3_B/I?
All SM6T18CAHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6T18CAHM3_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 SM6T18CAHM3_B/I part is unused and in its original packaging.
Return procedure for SM6T18CAHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T18CAHM3_B/I Tags
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