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Vishay General Semiconductor - Diodes Division SM6T18A-M3/52
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- Part No.:
- SM6T18A-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T18A-M3/52.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,317
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Product details
Overview
SM6T18A-M3/52 from Vishay General Semiconductor is a unidirectional surface-mount TRANSZORB® transient voltage suppressor in SMB (DO-214AA) package, with 15.3 V standoff voltage (VWM), 17.1–18.9 V breakdown voltage (VBR at 1 mA), 25.2 V clamping voltage (VC) at 24 A peak pulse current, and 600 W peak pulse power rating per 10/1000 μs waveform. It protects MOSFETs and sensor signal lines in automotive and industrial power electronics.
For engineers reviewing the SM6T18A-M3/52 datasheet, SM6T18A-M3/52 pinout, SM6T18A-M3/52 application, or SM6T18A-M3/52 equivalent, key selection criteria include unidirectional polarity, SMB thermal resistance (RθJA = 100 °C/W), AEC-Q101 qualification eligibility via HM3 suffix variants, and halogen-free RoHS compliance confirmed by the "M3" suffix.
Technical Context
This TVS diode operates as a clamping device in parallel with sensitive circuit nodes, conducting only when reverse voltage exceeds VBR to limit transients to ≤25.2 V. Its glass-passivated junction ensures stable leakage (<1 μA at VWM) and low inductance for fast response to ESD and load-switching surges.
Rated for 150 °C maximum junction temperature and derated above 25 °C ambient, it delivers 600 W peak pulse power under standardized 10/1000 μs waveform conditions when mounted on 5.0 mm × 5.0 mm copper pads - critical for automotive engine control unit (ECU) and industrial PLC I/O protection designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15.3 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 17.1 V / 18.9 V at 1 mA - precise breakdown threshold enabling accurate overvoltage trip design |
| VC @ IPPM | 25.2 V at 24 A - clamping voltage limits downstream IC stress during 600 W transient events |
| PPPM | 600 W - peak pulse power handling capability per 10/1000 μs waveform, validated per Fig. 1 |
| IFSM | 100 A - surge current rating for 10 ms half-sine wave, supporting high-energy inductive kick protection |
| TJ max. | +150 °C - extended junction temperature range enables use in under-hood automotive environments |
| RθJA | 100 °C/W - thermal resistance defines required PCB copper area for sustained 5.0 W power dissipation |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path (unidirectional operation) | Connected to ground or lower-potential node; conducts during positive transients when cathode is biased higher |
| Cathode | Reverse-biased terminal (marked with band) | Connected to protected line; initiates clamping when line voltage exceeds VBR relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables robust protection against ISO 7637-2 Pulse 1/2a/5a transients in 12 V automotive systems |
| Glass passivated chip junction | Ensures stable VBR tolerance (±5%) and <1 μA leakage at VWM, reducing standby power loss |
| Low inductance SMB package | Minimizes voltage overshoot during fast-rising ESD events (<1 ns rise time), improving clamping fidelity |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements |
| AEC-Q101 qualification path | HM3 suffix variants are qualified for automotive applications; M3 suffix confirms halogen-free compliance for commercial use |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Digital Input Module |
|---|---|
Use Scenario: Protects microcontroller GPIO and CAN transceiver pins from load-dump and alternator ripple transients in 12 V vehicle electrical systems. IC Role / Device Role: Unidirectional clamping TVS placed between signal line and chassis ground. Use Value: Clamps 25.2 V at 24 A, limiting stress on 3.3 V/5 V logic interfaces while surviving repeated 600 W pulses per ISO 16750-2. | Use Scenario: Shields 24 V DC digital input circuits from inductive switching spikes generated by solenoid valves and contactors. IC Role / Device Role: Standoff-rated TVS connected across input terminals to shunt transient energy before reaching optocoupler input stage. Use Value: 15.3 V VWM allows normal 24 V operation while clamping to 25.2 V-well below optocoupler breakdown-ensuring reliable signal integrity. |
| Consumer Appliance Motor Drive Board | Telecom Power Supply Front-End |
Use Scenario: Guards MCU reset and communication lines on washing machine motor control boards exposed to brush-commutator noise. IC Role / Device Role: Low-leakage (≤1 μA) unidirectional TVS placed adjacent to microcontroller pins. Use Value: Stable 17.1–18.9 V VBR ensures consistent clamping onset across temperature, preventing false resets during thermal cycling. | Use Scenario: Suppresses lightning-induced surges on AC/DC adapter input rails before rectification and filtering stages. IC Role / Device Role: Primary-side transient suppressor mounted directly at AC inlet connector. Use Value: 600 W PPPM and 100 A IFSM meet IEC 61000-4-5 Level 3 (2 kV line-to-line) surge immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A | Same SMB package, but 400 W PPPM; VC = 29.2 V at 13.7 A; RθJA = 110 °C/W | Limited to lower-energy transients; not suitable for ISO 7637-2 Pulse 5a | Select SMAJ18A only if system-level testing confirms 400 W rating suffices and thermal margin permits higher RθJA |
| 1.5SMC18A | Higher-power SMC package (1500 W); VC = 29.2 V at 51.3 A; larger footprint (7.11 × 6.22 mm vs. SMB's 4.57 × 3.94 mm) | Requires PCB layout change; suited for primary power rail protection, not signal-line placement | Choose 1.5SMC18A only when 1500 W surge handling is mandatory and board space allows SMC footprint |
Compared with SMAJ18A and 1.5SMC18A, SM6T18A-M3/52 delivers optimal balance of 600 W surge capacity, compact SMB size, and 25.2 V clamping-making it preferred for space-constrained, medium-energy signal-line protection where thermal management uses standard 5 mm × 5 mm pads.
Availability
SM6T18A-M3/52 is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC I/O protection, and consumer appliance motor control requiring stable component supply with halogen-free RoHS compliance.
Supply support for SM6T18A-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, rectifiers, TVS devices, and optoelectronics with emphasis on reliability and automotive-grade qualification.
The SM6T Series is designed specifically for surface-mount transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where consistent clamping performance and AEC-Q101 readiness are essential.
FAQ
What is the clamping voltage of SM6T18A-M3/52 and how is it measured?
The clamping voltage (VC) of SM6T18A-M3/52 is 25.2 V, measured at 24 A peak pulse current using the standardized 10/1000 μs double-exponential waveform per Figure 1 in Vishay document 88385. This value reflects the maximum voltage seen across the device during a 600 W transient event and is critical for ensuring protected ICs remain within their absolute maximum ratings. The SM6T18A-M3/52 achieves this clamping level while maintaining low leakage (<1 μA at 15.3 V).
Is SM6T18A-M3/52 suitable for automotive applications?
SM6T18A-M3/52 itself carries the halogen-free RoHS-compliant "M3" suffix and is part of the AEC-Q101-qualified SM6T family. While the base M3 variant is commercial-grade, automotive qualification is achieved with the HM3 suffix (e.g., SM6T18AHM3_B/H). Engineers selecting SM6T18A-M3/52 for automotive use must verify whether their program accepts commercial-grade parts or requires full AEC-Q101 documentation - the SM6T18A-M3/52 shares identical electrical specs and SMB package with its HM3 counterpart.
How does the SMB (DO-214AA) package of SM6T18A-M3/52 affect thermal performance?
The SMB package of SM6T18A-M3/52 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 defines the maximum steady-state power dissipation (5.0 W at TA = 50 °C) and influences transient thermal response. For high-reliability applications, designers must adhere to the recommended pad layout in Vishay's outline drawing to ensure the SM6T18A-M3/52 remains within its 150 °C TJ limit during repetitive surge events.
What is the meaning of the "-M3/52" suffix in SM6T18A-M3/52?
The "M3" suffix in SM6T18A-M3/52 indicates halogen-free, RoHS-compliant construction meeting JESD 201 Class 2 whisker resistance, while "/52" specifies packaging in 7-inch diameter plastic tape and reel with a base quantity of 750 units. This ordering code distinguishes it from E3 (standard RoHS), HE3 (AEC-Q101 + RoHS), and HM3 (AEC-Q101 + halogen-free) variants - all sharing identical electrical characteristics and SMB mechanical form factor.
Does SM6T18A-M3/52 have bidirectional capability?
No, SM6T18A-M3/52 is a unidirectional transient voltage suppressor. Its polarity is defined by the cathode band marking, and it conducts only during reverse-bias overvoltage events. For bidirectional operation, Vishay offers the CA-suffixed variant SM6T18CA-M3/52, which provides symmetrical clamping in both directions and omits the polarity band. The SM6T18A-M3/52 datasheet explicitly lists "Unidirectional" under Polarity in the PRIMARY CHARACTERISTICS table.
SM6T18A-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:
- 1
- Bidirectional Channels:
- -
- 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)
SM6T18A-M3/52 FAQ
1.How can I place an order for SM6T18A-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T18A-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 SM6T18A-M3/52 reliable?
The price and inventory of SM6T18A-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 SM6T18A-M3/52 is usually 5 days.
3.What payment methods are accepted for SM6T18A-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T18A-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T18A-M3/52?
SM6T18A-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T18A-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 SM6T18A-M3/52?
For technical support, including SM6T18A-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T18A-M3/52 requirements.
6.How does Aetrix verify that SM6T18A-M3/52 is sourced from the original manufacturer or authorized distributors?
All SM6T18A-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 SM6T18A-M3/52 meets industry standards.
7.What is the process for return or replacement of SM6T18A-M3/52?
All SM6T18A-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SM6T18A-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 SM6T18A-M3/52 part is unused and in its original packaging.
Return procedure for SM6T18A-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T18A-M3/52 Tags
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