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Vishay General Semiconductor - Diodes Division 1.5SMC350A-M3/57T
- Part No.:
- 1.5SMC350A-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC350A-M3/57T.pdf
- Description:
- TVS DIODE 300VWM 482VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:2,290
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Product details
Overview
1.5SMC350A-M3/57T from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for high-energy surge protection in power and signal lines. It features a 350 V standoff voltage (VWM), 368 V minimum breakdown voltage (VBR), 482 V maximum clamping voltage (VC) at 3.1 A peak pulse current (IPPM), and 1500 W peak pulse power capability with a 10/1000 μs waveform - deployed in industrial motor drives, automotive power modules, and telecom line interfaces.
For engineers reviewing the 1.5SMC350A-M3/57T datasheet, 1.5SMC350A-M3/57T pinout, 1.5SMC350A-M3/57T application, or 1.5SMC350A-M3/57T equivalent, key selection criteria include clamping performance under 10/1000 μs transients, thermal resistance (RθJA = 75 °C/W), unidirectional polarity marking, halogen-free RoHS compliance (M3 suffix), and SMC (DO-214AB) package compatibility with automated placement.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR (333–368 V), it avalanches to divert surge current away from downstream circuitry. Its glass-passivated junction ensures stable breakdown and low leakage (<1 μA at VWM), while the low incremental surge resistance enables rapid energy absorption without thermal runaway.
The device is rated for repetitive 10/1000 μs pulses at 0.01% duty cycle, supports 200 A non-repetitive forward surge (IFSM), and maintains operation across –65 °C to +150 °C junction temperature range. Mounting on 8.0 mm × 8.0 mm copper pads is required to achieve specified PPPM and thermal derating per Figure 2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off) | 300 V - Maximum continuous reverse operating voltage before conduction begins; defines safe operating margin below clamping threshold. |
| VBR (Breakdown) | 333–368 V at 1 mA - Verified avalanche onset range; ensures predictable turn-on during overvoltage events. |
| VC (Clamping) | 482 V at IPPM = 3.1 A - Peak voltage seen by protected circuit during full-rated transient; critical for IC/MOSFET voltage margin. |
| PPPM | 1500 W - Surge energy handling capacity with 10/1000 μs waveform; determines survivability against lightning or inductive spikes. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance; dictates PCB copper pad area (8.0 mm × 8.0 mm) needed for reliable power dissipation. |
| Package | SMC (DO-214AB) - Surface-mount outline with cathode band marking; compatible with standard SMT reflow and pick-and-place. |
| Compliance | Halogen-free, RoHS-compliant (M3 suffix); meets JESD201 Class 2 whisker resistance and MSL Level 1 (260 °C peak). |
Pinout & Package
Package: SMC (DO-214AB), molded plastic case with matte tin-plated leads, cathode indicated by a band on the body. Dimensions: 7.11 mm × 6.22 mm × 2.62 mm (L × W × H), with 3.20 mm minimum lead length and 1.52 mm minimum lead spacing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference | Connected to lower-potential side of protected line; reverse-biased during surge to trigger clamping. |
| Cathode | Clamping output / Surge current sink | Marked with band; tied to ground or common return path to shunt transient energy safely. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) in DC power rails without derating. |
| Glass-passivated junction | Ensures long-term stability of VBR and low leakage (<1 μA) across temperature and lifetime stress conditions. |
| Low profile SMC package | Reduces board space vs. DO-15/DO-201; supports high-density layouts in automotive ECUs and base station power supplies. |
| AEC-Q101 qualification option | Available in HM3 variant (e.g., 1.5SMC350AHM3_B/H); validated for automotive under-hood environments per stress test requirements. |
| Halogen-free (M3) | Meets IPC-4101D/21 and JEDEC J-STD-609A Class 1 standards; eliminates corrosive off-gassing during reflow or field operation. |
Applications
| Industrial Motor Drives | Automotive Power Modules |
|---|---|
Use Scenario: Protection of IGBT gate drivers and DC bus sensing circuits against switching-induced voltage spikes and load dump transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between high-side driver output and ground to clamp negative-going transients and prevent latch-up. Use Value: Limits clamped voltage to ≤482 V, preserving 600 V IGBT gate oxide integrity and enabling use of cost-optimized 500 V-rated support components. |
Use Scenario: Input protection for 12 V/24 V DC-DC converters in engine control units exposed to ISO 7637-2 Pulse 1, 2a, and 5a. IC Role / Device Role / Timing Role: Primary front-end surge suppressor on battery feed line, absorbing up to 1500 W for 1 ms without failure. Use Value: Withstands 200 A non-repetitive surge (IFSM), eliminating need for series fusing in compact ECU designs where layout space is constrained. |
| Telecom Line Interfaces | Renewable Energy Inverters |
Use Scenario: Secondary protection on Ethernet PHY power rails and RS-485 bias networks subjected to induced lightning surges. IC Role / Device Role / Timing Role: Standoff-limited clamping device placed after primary GDT or polymer PTC, refining residual voltage to safe levels. Use Value: 300 V VWM allows coexistence with 24 V or 48 V PoE systems; 482 V VC ensures downstream PHY ICs (e.g., MAX13442) remain within absolute max ratings. |
Use Scenario: DC link overvoltage suppression in solar string inverters during rapid MPPT transitions or grid fault recovery. IC Role / Device Role / Timing Role: Parallel-connected TVS on 600–1000 V DC bus to clamp fast-rising transients from stray inductance and relay bounce. Use Value: 368 V VBR and 482 V VC provide ≥118 V design margin above 350 V nominal bus, supporting UL 1741 SA compliance for rapid shutdown response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ350A | Same VWM/VBR/VC specs but SMB (DO-214AA) package; 30% smaller footprint, higher RθJA (100 °C/W). | Better suited for space-constrained consumer power adapters; requires tighter thermal management due to reduced pad area. | Select when board real estate is critical and peak surge duty is infrequent; verify thermal margin with 8.0 mm² pads. |
| 1.5KE350A | Through-hole DO-201AE package; identical electrical specs but higher mounting height and manual assembly requirement. | Preferred for prototyping, high-reliability military/aerospace boards, or legacy through-hole production lines. | Choose for hand-soldered evaluation or where automated SMT is unavailable; avoid in high-vibration automotive modules. |
Compared with SMBJ350A and 1.5KE350A, the 1.5SMC350A-M3/57T delivers optimal balance of surge robustness, SMT manufacturability, and thermal performance in volume industrial and automotive applications - its SMC package enables automated placement while maintaining lower thermal resistance than SMB variants and avoiding through-hole assembly constraints.
Availability
1.5SMC350A-M3/57T is available at Aetrix Electronics and suitable for industrial motor drives, automotive power modules, and telecom line interfaces requiring stable component supply, halogen-free compliance, and AEC-Q101-qualified alternatives.
Supply support for 1.5SMC350A-M3/57T 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 1.5SMC Series was developed for high-power, surface-mount transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where compact size, repeatable clamping, and long-term stability under thermal cycling are essential.
FAQ
What is the maximum clamping voltage of the 1.5SMC350A-M3/57T under a 10/1000 μs surge?
The 1.5SMC350A-M3/57T has a maximum clamping voltage (VC) of 482 V when subjected to its rated peak pulse current of 3.1 A with a 10/1000 μs waveform. This value is measured per Figure 1 and Table on page 2 of the Vishay datasheet 88303 and defines the upper voltage limit imposed on protected circuitry during worst-case transient events.
Is the 1.5SMC350A-M3/57T RoHS-compliant and halogen-free?
Yes, the 1.5SMC350A-M3/57T carries the M3 suffix, indicating it is both RoHS-compliant and halogen-free per IPC-4101D/21 and JEDEC J-STD-609A Class 1 standards. This is confirmed in the Mechanical Data section of Vishay document 88303, which specifies M3 as "halogen-free, RoHS-compliant, commercial grade".
Does the 1.5SMC350A-M3/57T have AEC-Q101 qualification?
The base 1.5SMC350A-M3/57T is not AEC-Q101 qualified; however, the automotive-grade variant 1.5SMC350AHM3_B/H (with HM3 suffix and revision code B) is explicitly qualified per AEC-Q101. This is documented in Note (2) on page 3 of datasheet 88303, which states "_B is available for 1.5SMC250A to 1.5SMC540A, AEC-Q101 qualified".
What is the thermal resistance and recommended PCB layout for the 1.5SMC350A-M3/57T?
The 1.5SMC350A-M3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W, achievable only when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, as specified in the Maximum Ratings table and Figure 2 of datasheet 88303. Smaller pads increase thermal resistance and reduce surge rating.
How does the 1.5SMC350A-M3/57T differ from bidirectional variants like 1.5SMC350CA?
The 1.5SMC350A-M3/57T is unidirectional, with polarity marked by a cathode band and intended for DC line protection where reverse conduction must be blocked. In contrast, 1.5SMC350CA is bidirectional, lacks polarity marking, and clamps symmetrically in both directions - making it suitable for AC signal lines or differential buses where voltage polarity reverses.
1.5SMC350A-M3/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- 1.5SMC, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 300V
- Voltage - Breakdown (Min):
- 333V
- Voltage - Clamping (Max) @ Ipp:
- 482V
- Current - Peak Pulse (10/1000µs):
- 3.1A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMCJ)
1.5SMC350A-M3/57T FAQ
1.How can I place an order for 1.5SMC350A-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC350A-M3/57T 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 1.5SMC350A-M3/57T reliable?
The price and inventory of 1.5SMC350A-M3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC350A-M3/57T is usually 5 days.
3.What payment methods are accepted for 1.5SMC350A-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC350A-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC350A-M3/57T?
1.5SMC350A-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC350A-M3/57T 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 1.5SMC350A-M3/57T?
For technical support, including 1.5SMC350A-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC350A-M3/57T requirements.
6.How does Aetrix verify that 1.5SMC350A-M3/57T is sourced from the original manufacturer or authorized distributors?
All 1.5SMC350A-M3/57T 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 1.5SMC350A-M3/57T meets industry standards.
7.What is the process for return or replacement of 1.5SMC350A-M3/57T?
All 1.5SMC350A-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC350A-M3/57T, 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 1.5SMC350A-M3/57T part is unused and in its original packaging.
Return procedure for 1.5SMC350A-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC350A-M3/57T Tags
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