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Vishay General Semiconductor - Diodes Division SM6T18CAHM3_A/H
- Part No.:
- SM6T18CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T18CAHM3_A/H.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,947
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Product details
Overview
SM6T18CAHM3_A/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal and power lines. It features a 15.3 V stand-off voltage (VWM), 17.1–18.9 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 μs), and clamps to ≤32.5 V at 24 A peak pulse current - used for protecting automotive sensor interfaces and industrial I/O circuits.
For engineers reviewing the SM6T18CAHM3_A/H datasheet, SM6T18CAHM3_A/H pinout, SM6T18CAHM3_A/H application, or SM6T18CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping voltage under 33 V, SMB package compatibility with automated SMT assembly, and compliance with halogen-free and RoHS requirements.
Technical Context
This bidirectional TVS diode operates symmetrically across both polarities, enabling protection of AC-coupled or differential signal paths without polarity constraints. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 μA at VWM), while the low-inductance SMB package supports fast transient response.
The device delivers 600 W peak pulse power per the 10/1000 μs waveform standard and is rated for continuous operation up to +150 °C junction temperature. It meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101 for automotive applications - confirmed by HM3 suffix and "_A/H" revision code.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15.3 V - maximum reverse stand-off voltage before significant conduction begins; defines safe operating window for protected circuitry. |
| VBR min/max | 17.1 V / 18.9 V at IT = 1 mA - tight breakdown tolerance ensures predictable clamping onset across production lots. |
| VC @ IPPM | ≤32.5 V at 24 A (10/1000 μs) - clamping voltage directly limits stress on downstream ICs during ESD or load-dump events. |
| PPPM | 600 W - peak pulse power handling capacity determines survivability against high-energy transients like ISO 7637-2 Pulse 5a. |
| TJ max | +150 °C - enables use in under-hood automotive environments and high-ambient industrial settings without derating. |
| 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. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical terminal configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically; bidirectional clamping occurs regardless of voltage polarity applied across device. |
| Case (body) | Thermal and mechanical interface | Non-electrical; copper pad layout per Vishay recommendation (0.2" × 0.2") ensures specified thermal resistance (RθJA = 100 °C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., CAN, RS-485), and ungrounded sensor outputs without polarity concerns. |
| 600 W peak pulse power (10/1000 μs) | Withstands high-energy transients such as automotive load dump (ISO 16750-2) and inductive switching spikes in motor control systems. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive electronics including body control modules, ADAS sensors, and infotainment power rails. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and JEDEC JS709E; supports environmentally regulated industrial and consumer designs. |
| MSL Level 1 (260 °C peak reflow) | Compatible with standard lead-free SMT reflow profiles without pre-baking; reduces manufacturing complexity and cost. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting analog output lines of pressure, temperature, or position sensors in engine control units exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between sensor output and microcontroller ADC input. Use Value: Limits transient voltage to ≤32.5 V, preventing ADC saturation and latch-up in 3.3 V or 5 V microcontrollers. |
Use Scenario: Safeguarding 24 V digital input channels on PLC modules subjected to field-wiring induced surges and contact bounce. IC Role / Device Role / Timing Role: Primary overvoltage clamp on discrete optocoupler input side. Use Value: Absorbs 600 W pulses without degradation, maintaining long-term reliability in factory automation environments. |
| Automotive CAN Bus Protection | Consumer Power Adapter Input |
Use Scenario: Secondary-level surge suppression on CAN_H/CAN_L lines downstream of common-mode chokes in telematics gateways. IC Role / Device Role / Timing Role: Fast-response bidirectional TVS parallel to bus lines. Use Value: Clamps ESD (IEC 61000-4-2) and burst noise (IEC 61000-4-4) to safe levels while preserving signal integrity up to 1 Mbps. |
Use Scenario: Input-stage transient suppression on 12 V wall adapters for smart home hubs exposed to mains-borne surges. IC Role / Device Role / Timing Role: First-line defense against line transients before DC-DC converter input. Use Value: Withstands 10/1000 μs surges up to 600 W, reducing need for upstream MOVs and improving adapter MTBF. |
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), same SMB package, but lower PPPM (400 W); not AEC-Q101 qualified. | Limited to commercial-grade industrial or consumer applications where automotive qualification is unnecessary. | Select SMAJ18CA only when AEC-Q101 is not required and peak transient energy remains below 400 W. |
| 1.5KE18CA | Higher VWM (15.4 V), DO-204AC (DO-15) through-hole package, 1500 W PPPM; larger footprint and manual assembly required. | Suitable for legacy board designs or high-power front-end protection where PCB space and assembly method permit. | Choose 1.5KE18CA only if through-hole mounting is mandated and higher pulse power is needed - not drop-in compatible. |
Compared with SMAJ18CA and 1.5KE18CA, SM6T18CAHM3_A/H uniquely combines AEC-Q101 qualification, halogen-free compliance, and 600 W pulse rating in an automated-placement-ready SMB package - making it optimal for new automotive and high-reliability industrial designs requiring zero rework on soldering or qualification.
Availability
SM6T18CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC inputs, CAN bus nodes, and consumer power adapter protection requiring stable component supply and full traceability.
Supply support for SM6T18CAHM3_A/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, efficiency, and application-specific optimization.
The SM6T Series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where consistent clamping performance and AEC-Q101 validation are mandatory.
FAQ
What does the "CA" suffix indicate in SM6T18CAHM3_A/H?
The "CA" suffix denotes that SM6T18CAHM3_A/H is a bidirectional transient voltage suppressor, meaning it provides symmetrical clamping for both positive and negative voltage transients. This distinguishes it from unidirectional variants (e.g., SM6T18AHM3_A/H) and makes SM6T18CAHM3_A/H suitable for AC signal lines, differential buses, and floating-ground applications where polarity is undefined.
Is SM6T18CAHM3_A/H qualified for automotive use?
Yes, SM6T18CAHM3_A/H is AEC-Q101 qualified, as confirmed by the "HM3" suffix and "_A/H" revision code in its ordering nomenclature. It has undergone stress testing including temperature cycling, high-temperature reverse bias, and ESD per AEC-Q101 requirements - making SM6T18CAHM3_A/H appropriate for under-hood and cabin electronics in passenger vehicles and commercial vehicles.
What is the clamping voltage of SM6T18CAHM3_A/H at rated peak pulse current?
SM6T18CAHM3_A/H clamps to a maximum of 32.5 V at 24 A peak pulse current under the standard 10/1000 μs waveform. This value is measured per Figure 1 in the Vishay datasheet (Document Number: 88385) and represents the upper limit of voltage seen by protected circuitry during worst-case transient events - critical for ensuring compatibility with 3.3 V or 5 V logic interfaces.
Does SM6T18CAHM3_A/H require special PCB layout considerations?
Yes - SM6T18CAHM3_A/H must be mounted on minimum recommended copper pads (0.2" × 0.2" per terminal) to achieve the specified thermal resistance (RθJA = 100 °C/W) and 600 W pulse rating. Reduced pad area degrades power handling and increases junction temperature; SM6T18CAHM3_A/H layout should avoid thermal isolation and ensure direct connection to ground/power planes where possible.
How does the "HM3" suffix differ from "E3" or "M3" in SM6T18CAHM3_A/H?
The "HM3" suffix in SM6T18CAHM3_A/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; SM6T18CAHM3_A/H is therefore certified for mission-critical automotive applications where reliability and regulatory compliance are non-negotiable.
SM6T18CAHM3_A/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:
- 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/H FAQ
1.How can I place an order for SM6T18CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T18CAHM3_A/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_A/H reliable?
The price and inventory of SM6T18CAHM3_A/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_A/H is usually 5 days.
3.What payment methods are accepted for SM6T18CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T18CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T18CAHM3_A/H?
SM6T18CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T18CAHM3_A/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_A/H?
For technical support, including SM6T18CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T18CAHM3_A/H requirements.
6.How does Aetrix verify that SM6T18CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SM6T18CAHM3_A/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_A/H meets industry standards.
7.What is the process for return or replacement of SM6T18CAHM3_A/H?
All SM6T18CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SM6T18CAHM3_A/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_A/H part is unused and in its original packaging.
Return procedure for SM6T18CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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