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Vishay General Semiconductor - Diodes Division 1.5SMC350A-M3/9AT
- Part No.:
- 1.5SMC350A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC350A-M3/9AT.pdf
- Description:
- TVS DIODE 300VWM 482VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:7,585
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Product details
Overview
1.5SMC350A-M3/9AT 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), 482 V clamping voltage at 3.1 A peak pulse current, and 1500 W peak pulse power capability with a 10/1000 μs waveform - deployed in automotive power supplies, industrial motor controls, and telecom line interfaces.
For engineers reviewing the 1.5SMC350A-M3/9AT datasheet, 1.5SMC350A-M3/9AT pinout, 1.5SMC350A-M3/9AT application, or 1.5SMC350A-M3/9AT equivalent, key selection criteria include unidirectional polarity, SMC (DO-214AB) package compatibility, clamping performance under repetitive transients, and halogen-free RoHS compliance per M3 suffix.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds its breakdown threshold (333–368 V at 1 mA), it avalanches to divert surge current away from downstream circuitry. Its glass-passivated junction ensures stable leakage and fast response (<1 ns), while low incremental surge resistance maintains tight clamping under high di/dt conditions.
The device is rated for 150 °C maximum junction temperature and derates linearly above 25 °C ambient, with thermal resistance of 75 °C/W (junction-to-ambient) on standard 8 mm × 8 mm copper pads. It meets J-STD-020 MSL Level 1 and supports automated SMT placement without reflow concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off) | 300 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC/AC working margin. |
| VBR (Breakdown) | 333–368 V at 1 mA - Verified avalanche initiation range; ensures predictable turn-on during transients. |
| VC (Clamping) | 482 V at IPPM = 3.1 A - Peak voltage seen by protected circuit during 10/1000 μs surge; determines stress on downstream ICs. |
| PPPM | 1500 W - Surge energy handling capacity per single 10/1000 μs pulse; supports IEC 61000-4-5 Level 4 compliance. |
| ID (Leakage) | 1 μA max at VWM - Ultra-low reverse leakage preserves efficiency in high-impedance bias networks. |
| TJ max | 150 °C - Enables operation in under-hood automotive or enclosed industrial enclosures without forced cooling. |
| Package | SMC (DO-214AB) - Standardized 2-pin surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with IPC-7351B. |
Pinout & Package
Package: SMC (DO-214AB), molded plastic case with matte tin-plated leads; cathode indicated by band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / surge return path | Connected to system ground or low-side reference; completes clamping loop during transient events. |
| Cathode | Reverse-biased terminal / surge input node | Connected to protected line (e.g., 24 V rail or RS-485 bus); conducts avalanche current when VAK > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Supports robust protection against lightning-induced surges (IEC 61000-4-5) and inductive switching spikes in 24–48 V systems. |
| Glass passivated junction | Ensures long-term stability of VBR and leakage across temperature and humidity; eliminates risk of junction corrosion in harsh environments. |
| Halogen-free & RoHS-compliant (M3) | Meets EU Directive 2011/65/EU and JEDEC J-STD-20E; eliminates brominated flame retardants for safer end-of-life processing. |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow profiles up to 260 °C peak - no baking required prior to assembly. |
| AEC-Q101 qualified option | Available in HM3 variant (e.g., 1.5SMC350AHM3_B/I); validated for automotive powertrain and body electronics applications. |
Applications
| Automotive Power Distribution | Industrial Motor Drive Inputs |
|---|---|
|
Use Scenario: Protection of 24 V supply rails feeding ECUs, sensors, and actuators against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between battery rail and ground, triggered within nanoseconds of overvoltage onset. Use Value: Clamps transients to ≤482 V, preventing damage to 36 V-rated CAN transceivers and microcontrollers downstream. |
Use Scenario: Input stage safeguard for variable-frequency drives exposed to back-EMF from 3-phase induction motors. IC Role / Device Role / Timing Role: Primary overvoltage clamp on DC bus or control signal lines, absorbing repetitive 1500 W pulses at <0.01% duty cycle. Use Value: Maintains <1 μA leakage at 300 V, avoiding false triggering while enabling reliable 100 kHz switching integrity. |
| Telecom Line Interface | Renewable Energy Inverter DC Link |
|
Use Scenario: Secondary protection on PoE-powered Ethernet ports and base station RF front-end bias lines. IC Role / Device Role / Timing Role: Fast-response voltage limiter placed after primary gas discharge tube (GDT), handling residual surge energy. Use Value: 482 V clamping ensures protected PHY ICs (e.g., DP83867) remain within absolute maximum ratings during combined lightning + GDT follow-on current. |
Use Scenario: DC link surge suppression in solar string inverters subjected to grid-switching transients and PV array arcing events. IC Role / Device Role / Timing Role: Parallel-connected TVS on 600 V nominal DC bus, activated only during rare >300 V excursions. Use Value: Withstands 150 °C junction temperature and 75 °C/W thermal resistance, enabling direct mounting on busbar copper without heatsink. |
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 - 3.5 mm shorter and 1.2 mm narrower footprint. | Lower PPPM (600 W) limits use to sub-IEC Level 3 surges; unsuitable for 24 V automotive load dump. | Select when board space is constrained and surge energy is ≤600 W; verify pad thermal relief for 3.1 A pulse. |
| 1.5KE350A | Through-hole TO-204AE (DO-201AD) package; identical electrical specs but higher RθJA (100 °C/W) and no MSL Level 1 rating. | Requires wave soldering or hand-soldering; incompatible with fully automated SMT lines and high-reliability reflow processes. | Choose only for legacy through-hole designs or prototyping where SMT infrastructure is unavailable. |
Compared with SMBJ350A and 1.5KE350A, the 1.5SMC350A-M3/9AT delivers full 1500 W surge immunity in an MSL Level 1–qualified SMT package, enabling automotive-grade reliability and automated manufacturing - critical for production-scale 24–48 V power systems.
Availability
1.5SMC350A-M3/9AT is available at Aetrix Electronics and suitable for automotive power distribution, industrial motor drive inputs, and telecom line interface applications requiring stable component supply, halogen-free compliance, and AEC-Q101 traceability via HM3 variants.
Supply support for 1.5SMC350A-M3/9AT 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, power efficiency, and automotive qualification.
The 1.5SMC Series was engineered for high-power transient suppression in space-constrained SMT layouts - targeting automotive, industrial, and telecom systems where 1500 W surge handling and MSL Level 1 process compatibility are mandatory.
FAQ
What is the clamping voltage of the 1.5SMC350A-M3/9AT under a 10/1000 μs surge?
The 1.5SMC350A-M3/9AT clamps to a maximum of 482 V when subjected to its rated peak pulse current of 3.1 A using the standardized 10/1000 μs waveform. This value is measured per Figure 1 in Vishay document 88303 and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream ICs remain within their absolute maximum ratings.
Is the 1.5SMC350A-M3/9AT suitable for automotive applications?
Yes, the 1.5SMC350A-M3/9AT is halogen-free and RoHS-compliant per its M3 suffix, and an AEC-Q101 qualified version (1.5SMC350AHM3_B/I) is available. While the M3/9AT variant itself is commercial-grade, its 150 °C TJ max, 1500 W surge rating, and MSL Level 1 reflow compatibility make it widely adopted in non-safety-critical automotive subsystems such as body control modules and infotainment power rails.
What does the "/9AT" suffix indicate in 1.5SMC350A-M3/9AT?
The "/9AT" suffix denotes packaging: 13-inch diameter plastic tape and reel containing 3500 units. This format supports high-volume automated pick-and-place assembly. The "M3" prefix confirms halogen-free, RoHS-compliant construction, while "A" specifies unidirectional polarity - all consistent with Vishay's 1.5SMC Series ordering conventions documented in revision 09-Mar-2026.
How does the 1.5SMC350A-M3/9AT compare to bidirectional TVS diodes like 1.5SMC350CA?
The 1.5SMC350A-M3/9AT is unidirectional and intended for DC line protection where polarity is fixed (e.g., 24 V supply to ground), offering lower leakage and tighter VBR tolerance. In contrast, 1.5SMC350CA is bidirectional - suited for AC or differential signal lines like RS-485 - but exhibits higher ID and slightly reduced PPPM due to dual-junction architecture. Selection depends strictly on circuit polarity requirements.
What is the thermal resistance of the 1.5SMC350A-M3/9AT, and how does it affect layout?
The 1.5SMC350A-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal, as defined in Vishay document 88303. To maintain safe operation under repetitive surges, PCB layout must provide minimum copper area per pad; reducing pad size increases RθJA and risks exceeding 150 °C junction temperature during sustained pulse trains.
1.5SMC350A-M3/9AT 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-M3/9AT FAQ
1.How can I place an order for 1.5SMC350A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC350A-M3/9AT 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-M3/9AT reliable?
The price and inventory of 1.5SMC350A-M3/9AT 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-M3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC350A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC350A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC350A-M3/9AT?
1.5SMC350A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC350A-M3/9AT 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-M3/9AT?
For technical support, including 1.5SMC350A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC350A-M3/9AT requirements.
6.How does Aetrix verify that 1.5SMC350A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC350A-M3/9AT 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-M3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC350A-M3/9AT?
All 1.5SMC350A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC350A-M3/9AT, 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-M3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC350A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC350A-M3/9AT Tags
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DESD3V3E1BL-7B
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