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Vishay General Semiconductor - Diodes Division SM6T18CAHM3/H
- Part No.:
- SM6T18CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T18CAHM3/H.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,870
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Product details
Overview
SM6T18CAHM3/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), 32.5 V maximum clamping voltage (VC) at 123 A peak pulse current (IPPM), and 600 W peak pulse power (PPPM). It protects signal lines and power rails in automotive sensor interfaces against ESD and inductive switching transients.
For engineers reviewing the SM6T18CAHM3/H datasheet, SM6T18CAHM3/H pinout, SM6T18CAHM3/H application, or SM6T18CAHM3/H equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification, halogen-free RoHS compliance, low clamping ratio (VC/VBR ≈ 1.54), and SMB thermal resistance (RθJA = 100 °C/W) for board-level surge protection design.
Technical Context
This device operates as a voltage-clamped crowbar during transients: when reverse voltage exceeds VBR (21.2–23.1 V), it avalanches to limit VC to ≤32.5 V at 123 A (10/1000 μs waveform). Its bidirectional structure enables symmetrical clamping on AC-coupled or differential lines without polarity concerns.
Designed for surface-mount automation, it features glass-passivated junctions, MSL Level 1 moisture sensitivity, and JESD201 Class 2 whisker resistance. The SMB package supports 0.2" × 0.2" copper pads for optimal thermal dissipation under repetitive surge conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min) | 21.2 V - Minimum breakdown voltage at 1 mA test current; defines clamping onset threshold |
| VC (max) | 32.5 V - Maximum clamped voltage at 123 A (10/1000 μs); determines protected circuit stress level |
| PPPM | 600 W - Peak transient power handling capacity; validates robustness against IEC 61000-4-5 surges |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance; sets derating requirement above 25 °C ambient |
| Package | SMB (DO-214AA) - Standardized 2-pin SMD outline with 5.59 mm body length and 2.20 mm height |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD |
Pinout & Package
SMB (DO-214AA) package: surface-mount, 2-terminal, unmarked bidirectional device with no polarity marking; terminals are matte tin-plated, solderable per J-STD-002 and JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (reverse bias) | One terminal of symmetrical PN junction; conducts during positive or negative overvoltage events |
| Cathode | Transient current entry (reverse bias) | Second terminal of symmetrical PN junction; identical function to Anode due to bidirectional construction |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Supports IEC 61000-4-5 Level 4 (4 kV surge) protection on 12 V automotive power rails |
| Bidirectional clamping | Enables single-device protection of AC-coupled interfaces (e.g., CAN, LIN, RS-485) without external polarity management |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive under-hood environments including -40 °C to +125 °C operation and 1000-cycle temperature cycling |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and IPC-1752A material declaration requirements for green manufacturing |
| Low clamping ratio (VC/VBR ≈ 1.54) | Minimizes voltage overshoot during fast transients, reducing risk of downstream IC latch-up or gate oxide damage |
Applications
| Automotive Sensor Protection | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protecting ABS wheel speed sensor outputs from load-dump and inductive kickback in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential sensor output pair to clamp ±30 V transients within 1 ns response time. Use Value: Prevents false triggering or permanent damage to microcontroller ADC inputs while maintaining signal integrity below 18 V nominal range. | Use Scenario: Shielding CANH/CANL lines in factory automation PLCs against EFT bursts and ground bounce during motor drive switching. IC Role / Device Role / Timing Role: Symmetrical clamping device mounted at connector entry point to divert >100 A surge energy away from transceiver IC. Use Value: Ensures CAN FD communication remains error-free after repeated 2 kV EFT exposure per IEC 61000-4-4, extending system uptime. |
| Consumer USB Power Delivery | Telecom DSL Line Interface |
Use Scenario: Safeguarding USB-C CC and VCONN lines against hot-plug ESD events up to ±15 kV contact discharge. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS integrated into Type-C receptacle PCB layout adjacent to connector pins. Use Value: Limits ESD-induced voltage to <33 V during 150 ps rise-time events, preventing latch-up in USB PD controllers without signal distortion. | Use Scenario: Protecting ADSL2+ line drivers from lightning-induced surges entering via outdoor telephone wiring. IC Role / Device Role / Timing Role: Primary surge suppression stage before transformer coupling, rated for 600 W 10/1000 μs waveform per ITU-T K.20. Use Value: Clamps induced common-mode voltages to <35 V, preserving line driver SOA and avoiding fuse blow-out during Category B lightning strikes. |
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 (18 V) and VC (32.4 V), but lower PPPM (400 W); SMA package (smaller footprint, higher RθJA = 140 °C/W) | Limited to lower-energy transients (IEC 61000-4-5 Level 2); unsuitable for automotive load-dump where 600 W is required | Select SM6T18CAHM3/H when 600 W surge rating and AEC-Q101 qualification are mandatory |
| SMCJ18CA | Higher PPPM (1500 W), same VWM/VC, but larger SMC package (7.11 mm x 6.22 mm); RθJA = 35 °C/W | Over-specified for space-constrained automotive modules; requires larger PCB area and different pad layout | Choose SM6T18CAHM3/H for cost-sensitive, space-limited SMB designs needing AEC-Q101 and 600 W balance |
Compared with SMAJ18CA and SMCJ18CA, SM6T18CAHM3/H delivers optimal trade-off between surge robustness (600 W), automotive qualification, and SMB footprint-enabling compact, production-ready protection without thermal derating penalties or layout redesign.
Availability
SM6T18CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial CAN bus nodes, consumer USB-C power delivery circuits, and telecom DSL line protection requiring stable component supply and long-term lifecycle support.
Supply support for SM6T18CAHM3/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, automotive-qualified components.
The SM6T Series is designed specifically for board-level transient suppression in harsh environments-targeting automotive, industrial, and telecom applications where AEC-Q101 compliance, bidirectional symmetry, and consistent 600 W surge capability are critical.
FAQ
What is the clamping voltage of SM6T18CAHM3/H at its rated peak pulse current?
The SM6T18CAHM3/H has a maximum clamping voltage (VC) of 32.5 V at 123 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per Figure 1 in Vishay document 88385 and ensures downstream ICs remain within safe operating voltage limits during surge events. The SM6T18CAHM3/H maintains this clamping performance across its full operating temperature range of -65 °C to +150 °C.
Is SM6T18CAHM3/H qualified for automotive applications?
Yes, SM6T18CAHM3/H is AEC-Q101 qualified, as confirmed by the HM3 suffix in its ordering code. This qualification covers stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD per JESD22-A114. The SM6T18CAHM3/H is approved for use in automotive subsystems such as body control modules, ADAS sensor interfaces, and infotainment power supplies where reliability under thermal and electrical stress is mandatory.
How does the bidirectional design of SM6T18CAHM3/H affect its circuit placement?
The bidirectional architecture of SM6T18CAHM3/H eliminates polarity sensitivity, allowing placement across any two points requiring symmetrical overvoltage protection-such as differential signal pairs (CANH/CANL), AC-coupled audio lines, or transformer-isolated interfaces. Unlike unidirectional TVS diodes, SM6T18CAHM3/H requires no cathode band orientation check during assembly, simplifying automated placement and reducing field failure risk from misorientation.
What is the thermal resistance of SM6T18CAHM3/H and how does it impact layout?
SM6T18CAHM3/H 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. This value dictates that PCB layout must provide adequate copper area to avoid exceeding 150 °C junction temperature during repetitive surges. For high-duty-cycle applications, designers should verify thermal performance using Vishay's derating curves in Figure 2 of document 88385, referencing the SM6T18CAHM3/H specific data.
Does SM6T18CAHM3/H meet halogen-free and RoHS requirements?
Yes, SM6T18CAHM3/H carries the HM3 suffix, indicating it is both halogen-free and RoHS-compliant per EU Directive 2011/65/EU and Vishay's material declaration standard (document 99912). The molding compound meets UL 94 V-0 flammability rating, and terminals are matte tin-plated per J-STD-002. This makes SM6T18CAHM3/H suitable for green manufacturing programs requiring full substance compliance reporting.
SM6T18CAHM3/H 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:
- Discontinued at Digi-Key
- 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/H FAQ
1.How can I place an order for SM6T18CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T18CAHM3/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/H reliable?
The price and inventory of SM6T18CAHM3/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/H is usually 5 days.
3.What payment methods are accepted for SM6T18CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T18CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T18CAHM3/H?
SM6T18CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T18CAHM3/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/H?
For technical support, including SM6T18CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T18CAHM3/H requirements.
6.How does Aetrix verify that SM6T18CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SM6T18CAHM3/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/H meets industry standards.
7.What is the process for return or replacement of SM6T18CAHM3/H?
All SM6T18CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SM6T18CAHM3/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/H part is unused and in its original packaging.
Return procedure for SM6T18CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T18CAHM3/H Tags
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