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Vishay General Semiconductor - Diodes Division SM6T18CA-M3/52
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- Part No.:
- SM6T18CA-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T18CA-M3/52.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,681
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Product details
Overview
SM6T18CA-M3/52 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 18 V standoff voltage (VWM), 25.2 V maximum clamping voltage at 24 A peak pulse current (10/1000 μs), 600 W peak pulse power rating, and operates across -65 °C to +150 °C junction temperature range - deployed in automotive sensor protection and industrial I/O interface circuits.
For engineers reviewing the SM6T18CA-M3/52 datasheet, SM6T18CA-M3/52 pinout, SM6T18CA-M3/52 application, or SM6T18CA-M3/52 equivalent, key selection criteria include bidirectional clamping capability, 18 V working voltage tolerance, SMB package thermal resistance (RθJA = 100 °C/W), AEC-Q101 qualification status, and halogen-free RoHS compliance per M3 suffix.
Technical Context
The SM6T18CA-M3/52 implements a glass-passivated silicon junction optimized for low-inductance transient suppression with symmetrical bidirectional breakdown behavior. Its clamping response is characterized under standardized 10/1000 μs and 8/20 μs waveforms, delivering consistent VC ≤ 25.2 V at IPPM = 24 A and VC ≤ 32.5 V at IPPM = 123 A (8/20 μs).
Designed for surface-mount automated placement, it meets J-STD-020 MSL Level 1 moisture sensitivity and withstands 260 °C lead-free reflow peak temperature. The device exhibits <1.0 μA reverse leakage at VWM = 18 V and maintains stable breakdown voltage (VBR = 17.1–18.9 V at IT = 1 mA) across its operating temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe signal line bias margin. |
| VBR (min/max) | 17.1 V / 18.9 V at 1 mA - Confirmed bidirectional breakdown threshold; ensures symmetric surge response. |
| VC @ IPPM | 25.2 V at 24 A (10/1000 μs) - Clamped voltage during worst-case transient; protects downstream ICs rated ≤ 24 V. |
| PPPM | 600 W - Peak pulse power handling capacity; supports high-energy ESD and load-switching surges. |
| ID @ VWM | ≤1.0 μA - Ultra-low reverse leakage at working voltage; preserves signal integrity in high-impedance sensor paths. |
| TJ max. | +150 °C - Enables deployment in under-hood automotive and industrial environments without derating. |
| RθJA | 100 °C/W - Thermal resistance to ambient on standard 0.2" × 0.2" copper pads; informs PCB layout cooling requirements. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H). Molding compound meets UL 94 V-0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward conduction mode | Connected to lower-potential side of protected line; enables bidirectional clamping when paired with cathode. |
| Cathode | Current exit point in forward conduction mode | Connected to higher-potential side; forms symmetrical avalanche path with anode for transient energy shunting. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity constraints. |
| 600 W peak pulse power (10/1000 μs) | Withstands high-energy transients from inductive switching (e.g., solenoid drivers, relay coils) without failure. |
| Low clamping voltage (25.2 V @ 24 A) | Provides tighter voltage limiting than unidirectional counterparts, reducing stress on 24 V-rated microcontrollers and transceivers. |
| AEC-Q101 qualified variant available | Supports automotive-grade reliability requirements (e.g., engine control modules, ADAS sensor interfaces) when ordered as HM3 suffix. |
| MSL Level 1, 260 °C peak reflow | Eliminates pre-baking requirement and supports standard lead-free SMT assembly processes. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load-dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across differential or single-ended signal lines upstream of interface ICs. Use Value: Limits transient excursions to ≤25.2 V, preserving signal integrity and preventing latch-up in 3.3 V/5 V/12 V sensor signal chains. |
Use Scenario: Safeguarding PLC digital input modules against field-wiring induced surges and ground-loop transients. IC Role / Device Role / Timing Role: Parallel-connected TVS on 24 V DC input terminals to divert surge current away from optocoupler input stages. Use Value: Absorbs 600 W pulses without degradation, enabling >100,000 surge cycles per IEC 61000-4-5 Level 4 compliance testing. |
| Telecom Line Protection | Consumer Power Adapter Input |
Use Scenario: Shielding Ethernet PHY magnetics and PoE injectors from lightning-induced surges on twisted-pair cabling. IC Role / Device Role / Timing Role: Primary-level TVS on secondary-side DC outputs (e.g., 48 V PSE ports) to clamp common-mode transients. Use Value: Symmetric clamping ensures equal protection on both conductors, maintaining signal balance and minimizing EMI coupling. |
Use Scenario: Suppressing fast-rising transients on AC-DC adapter primary-side rectifier outputs and secondary-side 5 V/12 V rails. IC Role / Device Role / Timing Role: Secondary-side clamping device across regulated output to prevent overvoltage damage to USB-C PD controllers and charging ICs. Use Value: 1.0 μA leakage at 18 V avoids quiescent current drain in always-on standby circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA | Same SMB package, identical VWM (18 V) and VC (25.2 V), but rated for 600 W with tighter VBR tolerance (17.1–18.9 V vs. 17.1–19.0 V); slightly higher RθJA (110 °C/W). | Preferred where tighter parametric consistency is required in high-volume industrial designs; not AEC-Q101 qualified in standard M3 variant. | Select SMBJ18CA if tighter VBR distribution and legacy design continuity are prioritized over automotive qualification. |
| 1.5KE18CA | Through-hole DO-15 package, same electrical specs (VWM = 18 V, VC = 25.2 V), but higher RθJA (150 °C/W) and larger footprint; no MSL Level 1 rating. | Suitable for prototyping or low-density boards where manual assembly or thermal derating margin permits larger package. | Choose 1.5KE18CA only for non-SMT applications or when existing through-hole infrastructure eliminates retooling cost. |
Compared with SM6T18CA-M3/52, SMBJ18CA offers marginally tighter VBR control but lacks AEC-Q101 support in commercial variants, while 1.5KE18CA trades surface-mount compatibility and thermal performance for mechanical robustness and legacy compatibility - making SM6T18CA-M3/52 optimal for space-constrained, automotive-qualified, and high-reliability SMT deployments.
Availability
SM6T18CA-M3/52 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line protection, and consumer power adapter designs requiring stable component supply and halogen-free compliance.
Supply support for SM6T18CA-M3/52 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SM6T Series is engineered for robust transient suppression in harsh environments, targeting automotive, industrial, and telecom systems where compact size, high pulse power, and AEC-Q101 qualification are critical.
FAQ
What is the clamping voltage of SM6T18CA-M3/52 under a 10/1000 μs transient?
The SM6T18CA-M3/52 has a maximum clamping voltage (VC) of 25.2 V when subjected to a 24 A peak pulse current with a 10/1000 μs waveform. This value is guaranteed across the full operating temperature range and is measured per JEDEC standards. The clamping performance ensures downstream 24 V-rated ICs remain within safe operating limits during surge events. SM6T18CA-M3/52 achieves this with minimal voltage overshoot due to its low-inductance SMB package and glass-passivated junction.
Is SM6T18CA-M3/52 suitable for automotive applications?
SM6T18CA-M3/52 itself is halogen-free and RoHS-compliant but not AEC-Q101 qualified; however, the identical device with HM3 suffix (e.g., SM6T18CAHM3_X) is fully AEC-Q101 qualified. Engineers selecting SM6T18CA-M3/52 for automotive use must verify qualification status via ordering code - the M3 suffix denotes commercial-grade halogen-free construction, while HM3 confirms automotive reliability testing. SM6T18CA-M3/52 remains widely used in non-safety-critical automotive subsystems where qualification is not mandated.
What does the "CA" suffix indicate in SM6T18CA-M3/52?
The "CA" suffix in SM6T18CA-M3/52 explicitly denotes a bidirectional configuration, meaning the device provides symmetrical transient suppression in both polarities - unlike unidirectional "A" variants that require correct orientation relative to circuit ground. This allows SM6T18CA-M3/52 to protect AC-coupled lines, differential buses, or floating nodes without polarity concerns. The CA designation is standardized across Vishay's TRANSZORB® family and confirmed in the Electrical Characteristics table with matched VBR min/max values for both directions.
How does the SMB (DO-214AA) package of SM6T18CA-M3/52 affect thermal performance?
The SMB package of SM6T18CA-M3/52 delivers a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads - significantly better than larger DO-15 or axial packages. This enables higher sustained power dissipation in compact layouts and supports reliable operation up to +150 °C junction temperature. The low-profile design also reduces parasitic inductance, improving high-speed transient response. SM6T18CA-M3/52 leverages this to maintain clamping stability during sub-microsecond surges.
What is the reverse leakage current specification for SM6T18CA-M3/52 at its standoff voltage?
SM6T18CA-M3/52 exhibits a maximum reverse leakage current (ID) of 1.0 μA when biased at its 18 V standoff voltage (VWM) and tested at 25 °C. This ultra-low leakage preserves signal fidelity in high-impedance sensor front-ends and battery-powered applications where quiescent current must be minimized. The value is verified per the datasheet's Electrical Characteristics table and remains ≤5.0 μA across the full -65 °C to +150 °C operating range - confirming stable performance in extreme environments. SM6T18CA-M3/52 achieves this via precise junction doping and glass passivation.
SM6T18CA-M3/52 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SM6T18CA-M3/52 FAQ
1.How can I place an order for SM6T18CA-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T18CA-M3/52 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 SM6T18CA-M3/52 reliable?
The price and inventory of SM6T18CA-M3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T18CA-M3/52 is usually 5 days.
3.What payment methods are accepted for SM6T18CA-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T18CA-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T18CA-M3/52?
SM6T18CA-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T18CA-M3/52 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 SM6T18CA-M3/52?
For technical support, including SM6T18CA-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T18CA-M3/52 requirements.
6.How does Aetrix verify that SM6T18CA-M3/52 is sourced from the original manufacturer or authorized distributors?
All SM6T18CA-M3/52 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 SM6T18CA-M3/52 meets industry standards.
7.What is the process for return or replacement of SM6T18CA-M3/52?
All SM6T18CA-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SM6T18CA-M3/52, 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 SM6T18CA-M3/52 part is unused and in its original packaging.
Return procedure for SM6T18CA-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T18CA-M3/52 Tags
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