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Vishay General Semiconductor - Diodes Division SM6T18CAHM3_B/H
- Part No.:
- SM6T18CAHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T18CAHM3_B/H.pdf
- Description:
- 600W,18V,5%,BIDIR, SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:6,234
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Product details
Overview
SM6T18CAHM3_B/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, rated for 18 V standoff voltage (VWM), 21.2 V minimum breakdown voltage (VBR), 600 W peak pulse power (10/1000 μs), and 150 °C max junction temperature - deployed to protect automotive sensor signal lines, industrial I/O ports, and power supply rails against ESD and inductive switching transients.
For engineers reviewing the SM6T18CAHM3_B/H datasheet, SM6T18CAHM3_B/H pinout, SM6T18CAHM3_B/H application, or SM6T18CAHM3_B/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, low clamping voltage (VC = 32.5 V at IPPM), and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
This device operates as a voltage-clamped surge protector with symmetrical reverse/forward conduction behavior due to its bidirectional architecture. It delivers precise clamping at 32.5 V under 10/1000 μs 18.6 A peak pulse current, with thermal resistance RθJA = 100 °C/W and RθJL = 20 °C/W enabling reliable operation up to 150 °C junction temperature.
Designed for high-reliability environments, SM6T18CAHM3_B/H features glass-passivated junctions, meets MSL Level 1 per J-STD-020 (260 °C reflow peak), and carries AEC-Q101 qualification - confirming suitability for automotive electronics where transient immunity and long-term solder-joint integrity are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - maximum continuous reverse voltage before clamping begins; defines operating margin for 12 V automotive systems. |
| VBR (min) | 21.2 V - guaranteed breakdown starts no lower than this value at 1 mA test current; ensures robust overvoltage threshold. |
| VC @ IPPM | 32.5 V - clamping voltage at 18.6 A (10/1000 μs); limits protected circuit stress during surge events. |
| PPPM | 600 W - peak pulse power handling; supports protection against ISO 7637-2 Pulse 1/2a/2b and IEC 61000-4-5 surges. |
| TJ max | +150 °C - maximum junction temperature; enables use in under-hood automotive modules and industrial enclosures. |
| Package | SMB (DO-214AA) - standardized surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with IPC-7351B land patterns. |
Pinout & Package
SMB (DO-214AA) package: bidirectional construction with no polarity marking; symmetric terminals require no anode/cathode orientation during placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge input terminal (bidirectional) | Accepts transient energy from either direction; connects to protected line (e.g., CAN_H or LIN bus). |
| Cathode | Surge input terminal (bidirectional) | Functionally identical to Anode in CA-suffix devices; forms symmetrical clamping path to ground or rail. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables robust protection against severe load-dump and inductive kick events without degradation. |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock testing. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets EU Directive 2011/65/EU and JEDEC J-STD-20D; supports green manufacturing and end-of-life recycling. |
| Low clamping ratio (VC/VBR ≈ 1.53) | Minimizes voltage overshoot during transients, reducing risk of downstream IC latch-up or damage. |
Applications
| Automotive Sensor Protection | Industrial I/O Port Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine control units exposed to ISO 7637-2 Pulse 5a load dump. IC Role / Device Role / Timing Role: Bidirectional TVS clamp limiting transient voltage to ≤32.5 V while absorbing 600 W surge energy. Use Value: Prevents sensor signal corruption and microcontroller reset during 12 V system voltage spikes up to 60 V. | Use Scenario: Shielding RS-485 transceiver inputs in factory automation PLCs from EFT bursts and cable-induced surges. IC Role / Device Role / Timing Role: Fast-response voltage limiter with <1 ns response time, placed directly at connector entry point. Use Value: Maintains data integrity across 1 Mbps differential links by suppressing transients before they reach PHY layer. |
| Power Supply Rail Clamp | Consumer Device ESD Guard |
Use Scenario: Safeguarding 12 V DC input rails of infotainment head units against battery reversal and jump-start transients. IC Role / Device Role / Timing Role: Standoff-rated TVS providing fail-safe clamping at 18 V nominal, with 21.2 V min VBR tolerance margin. Use Value: Eliminates need for series fusing in low-power auxiliary rails while meeting CISPR 25 Class 5 immunity. | Use Scenario: ESD protection for USB-C CC lines and sideband use (SBU) pins in portable audio accessories. IC Role / Device Role / Timing Role: Low-capacitance bidirectional suppressor (CJ ≈ 120 pF at 0 V) preserving signal integrity. Use Value: Withstands ±15 kV contact discharge per IEC 61000-4-2 without performance drift or leakage increase. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18CA | Same VWM (18 V), lower PPPM (400 W), SMA package (larger RθJA = 140 °C/W) | Limited to lower-energy transients; less suitable for automotive load-dump scenarios | Select when cost sensitivity outweighs peak power requirement and board space allows larger footprint |
| 1.5KE18CA | Higher PPPM (1500 W), axial DO-201 package, non-SMT, higher inductance | Requires through-hole assembly; unsuitable for high-density or automated production | Choose only for legacy through-hole designs or prototyping where manual assembly is acceptable |
Compared with SMAJ18CA and 1.5KE18CA, SM6T18CAHM3_B/H offers optimal balance of AEC-Q101 qualification, 600 W surge capacity, SMB footprint for automated placement, and halogen-free compliance - making it the preferred choice for new automotive and industrial SMT designs requiring certified reliability.
Availability
SM6T18CAHM3_B/H is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and consumer USB-C interface protection requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for SM6T18CAHM3_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 high-reliability and automotive-grade performance.
The SM6T Series is engineered specifically for board-level transient suppression in harsh environments - delivering consistent clamping, low inductance, and AEC-Q101 validation for automotive, industrial, and telecom infrastructure applications.
FAQ
What does the "CA" suffix indicate in SM6T18CAHM3_B/H?
The "CA" suffix denotes a bidirectional configuration, meaning SM6T18CAHM3_B/H provides symmetrical clamping in both forward and reverse directions - unlike unidirectional variants (e.g., SM6T18AHM3_B/H) that clamp only in reverse bias. This makes SM6T18CAHM3_B/H ideal for protecting AC-coupled or differential signal lines such as CAN, LIN, or RS-485 where polarity is undefined.
Is SM6T18CAHM3_B/H qualified for automotive applications?
Yes, SM6T18CAHM3_B/H is AEC-Q101 qualified, as confirmed by its HM3 suffix and documentation in Vishay's SM6T datasheet (Rev. 09-Jan-2024, Doc. #88385). This qualification covers stress tests including temperature cycling, high-temperature operating life, and ESD - validating SM6T18CAHM3_B/H for use in engine control units, body electronics, and ADAS sensor interfaces.
What is the clamping voltage of SM6T18CAHM3_B/H under surge conditions?
The clamping voltage VC of SM6T18CAHM3_B/H is 32.5 V at 18.6 A peak pulse current (10/1000 μs waveform), as specified in the Electrical Characteristics table. This value represents the maximum voltage seen across the device during a standardized surge event - critical for ensuring protected ICs remain within their absolute maximum ratings.
Does SM6T18CAHM3_B/H require polarity-aware PCB layout?
No, SM6T18CAHM3_B/H does not require polarity-aware layout because it is a bidirectional TVS diode with no cathode band marking. The SMB package has two identical terminals; either can connect to the protected line and the other to ground or return path - simplifying routing and eliminating orientation errors during automated assembly.
How does the HM3 suffix differ from E3 or M3 in SM6T18CAHM3_B/H?
The HM3 suffix in SM6T18CAHM3_B/H indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification - distinguishing it from E3 (RoHS-compliant commercial grade) and M3 (halogen-free RoHS-compliant commercial grade). Only HM3 and HE3 variants carry automotive qualification, making HM3 the appropriate choice for safety-critical vehicle subsystems.
SM6T18CAHM3_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:
- -
- 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/H FAQ
1.How can I place an order for SM6T18CAHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T18CAHM3_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 SM6T18CAHM3_B/H reliable?
The price and inventory of SM6T18CAHM3_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 SM6T18CAHM3_B/H is usually 5 days.
3.What payment methods are accepted for SM6T18CAHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T18CAHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T18CAHM3_B/H?
SM6T18CAHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T18CAHM3_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 SM6T18CAHM3_B/H?
For technical support, including SM6T18CAHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T18CAHM3_B/H requirements.
6.How does Aetrix verify that SM6T18CAHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SM6T18CAHM3_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 SM6T18CAHM3_B/H meets industry standards.
7.What is the process for return or replacement of SM6T18CAHM3_B/H?
All SM6T18CAHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SM6T18CAHM3_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 SM6T18CAHM3_B/H part is unused and in its original packaging.
Return procedure for SM6T18CAHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T18CAHM3_B/H Tags
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