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Vishay General Semiconductor - Diodes Division 1.5SMC350A-E3/9AT
- Part No.:
- 1.5SMC350A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC350A-E3/9AT.pdf
- Description:
- TVS DIODE 300VWM 482VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:5,476
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Product details
Overview
1.5SMC350A-E3/9AT 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), 368 V maximum breakdown voltage (VBR), 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 supply rails and industrial sensor interfaces.
For engineers reviewing the 1.5SMC350A-E3/9AT datasheet, 1.5SMC350A-E3/9AT pinout, 1.5SMC350A-E3/9AT application, or 1.5SMC350A-E3/9AT equivalent, key selection criteria include unidirectional polarity, SMC (DO-214AB) package compatibility, clamping performance under IEC 61000-4-5 surge conditions, thermal resistance (RθJA = 75 °C/W), and AEC-Q101 qualification status.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under transient overvoltage, it avalanches rapidly to divert surge current away from downstream circuitry while maintaining a controlled clamping voltage. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 μA at VWM).
The device is rated for repetitive 10/1000 μs surges at 0.01 % duty cycle, supports 200 A non-repetitive forward surge (8.3 ms half-sine), and sustains operation from –65 °C to +150 °C junction temperature - enabling use in harsh automotive and industrial environments without derating below 25 °C ambient.
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 limit. |
| VBR (Breakdown) | 333–368 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during transients. |
| VC (Clamping) | 482 V at IPPM = 3.1 A - Peak voltage seen by protected circuit during full-rated 1500 W surge; critical for IC survival margin. |
| PPPM | 1500 W - Peak pulse power handling per 10/1000 μs waveform; meets IEC 61000-4-5 Level 4 surge immunity requirements. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on standard 8 mm × 8 mm copper pads; determines thermal derating above 25 °C. |
| TJ max. | +150 °C - Maximum allowable junction temperature; enables operation in under-hood automotive locations. |
| ID (Leakage) | ≤1.0 μA at 300 V - Ultra-low reverse leakage preserves efficiency in high-impedance bias networks and battery-powered systems. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile plastic case with matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards. Polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode-side connection point for unidirectional operation | Connects to protected line; avalanche conduction occurs when line voltage exceeds VBR relative to anode. |
| Anode (unbanded end) | Reference/ground return path | Must be tied to system ground or lowest potential node; establishes reference for clamping action. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Enables single-device protection against severe lightning-induced surges per IEC 61000-4-5, reducing need for cascaded protection stages. |
| Glass passivated junction | Ensures long-term stability of VBR and low parametric drift across temperature and lifetime stress conditions. |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements. |
| AEC-Q101 qualified (suffix HE3/HM3 variants) | Validated for automotive powertrain and chassis applications; this E3/9AT variant is commercial-grade but shares identical die and package design. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 pulses), improving protection fidelity. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 24 V battery-fed ECUs from load dump and alternator transients per ISO 16750-2. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between power rail and chassis ground. Use Value: Clamps 350 V transients to ≤482 V within nanoseconds, preventing damage to MCU power inputs and CAN transceivers. |
Use Scenario: Safeguarding analog outputs (4–20 mA) and digital I/O of pressure/temperature sensors in factory automation. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS placed across signal and return lines. Use Value: Limits induced surges from nearby motor switching to <482 V, preserving ADC accuracy and isolator integrity. |
| Telecom DC Power Input Protection | Renewable Energy Inverter DC Link Protection |
Use Scenario: Guarding PoE-powered equipment front-end against AC/DC adapter transients and Ethernet-coupled surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 48 V input rail upstream of DC/DC converters. Use Value: Absorbs 1500 W surges without degradation, maintaining uptime in outdoor telecom cabinets. |
Use Scenario: Suppressing switching spikes and grid fault transients on PV string inputs of solar inverters. IC Role / Device Role / Timing Role: High-voltage TVS mounted across DC bus terminals near MPPT controller. Use Value: Withstands repeated 300 V+ surges up to 1500 W, extending capacitor and gate driver lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ350A-E3/52T | Same VWM/VBR/VC specs but SMB package (DO-214AA); lower PPPM (600 W); RθJA = 85 °C/W. | Limited to lower-energy surges (IEC 61000-4-5 Level 2); unsuitable for automotive load dump. | Select when board space is constrained and surge energy is ≤600 W; verify thermal margin with smaller pad area. |
| 1.5KE350A-T | Through-hole (DO-201AE); identical electrical specs; higher RθJA (100 °C/W); no RoHS-compliant E3 suffix option. | Requires wave soldering; not compatible with automated SMT lines; less suitable for high-volume production. | Choose only for legacy through-hole designs or prototyping where rework tolerance outweighs production efficiency. |
Compared with SMBJ350A-E3/52T and 1.5KE350A-T, the 1.5SMC350A-E3/9AT delivers superior surge robustness (1500 W vs. 600 W or 1500 W with inferior thermal performance), full SMT compatibility, and commercial-grade RoHS compliance - making it optimal for high-reliability, volume-manufactured 24–48 V systems.
Availability
1.5SMC350A-E3/9AT is available at Aetrix Electronics and suitable for automotive power distribution modules, industrial PLC I/O cards, and telecom DC power supplies requiring stable component supply, consistent lot-to-lot parametric performance, and full traceability.
Supply support for 1.5SMC350A-E3/9AT 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, surface-mount transient suppression in space-constrained, thermally demanding applications - particularly targeting automotive, industrial, and telecom infrastructure where robustness and repeatability are mandatory.
FAQ
What is the clamping voltage of the 1.5SMC350A-E3/9AT under full-rated surge conditions?
The 1.5SMC350A-E3/9AT exhibits a maximum clamping voltage (VC) of 482 V when subjected to its rated peak pulse current of 3.1 A (10/1000 μs waveform). This value is measured per Figure 1 in Vishay's 88303 datasheet and defines the upper voltage limit imposed on protected circuitry during worst-case transient events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is the 1.5SMC350A-E3/9AT AEC-Q101 qualified?
No - the 1.5SMC350A-E3/9AT carries the commercial-grade E3 suffix (RoHS-compliant, halogen-free), not the HE3 or HM3 automotive qualification suffixes. While the die and package are identical to AEC-Q101 versions (e.g., 1.5SMC350AHE3_B), this specific part number is intended for industrial and telecom applications. For automotive use, specify 1.5SMC350AHE3_B/I or equivalent AEC-Q101 ordering codes.
What is the thermal resistance and how does it affect layout for the 1.5SMC350A-E3/9AT?
The 1.5SMC350A-E3/9AT 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. To maintain safe junction temperature under sustained power dissipation, PCB layout must replicate this minimum pad area and ensure adequate copper pour and via stitching - especially important in high-temperature environments like automotive engine compartments.
Can the 1.5SMC350A-E3/9AT be used in bidirectional protection circuits?
No - the "A" suffix denotes unidirectional configuration; the 1.5SMC350A-E3/9AT conducts only in reverse avalanche mode and blocks forward current beyond VF ≈ 3.5 V at 100 A. For bidirectional protection, select the CA-suffixed variant (e.g., 1.5SMC350CA-E3/9AT), which provides symmetrical clamping in both polarities and is marked without polarity band.
What is the maximum reverse leakage current for the 1.5SMC350A-E3/9AT at its rated standoff voltage?
At its rated standoff voltage (VWM = 300 V) and TA = 25 °C, the 1.5SMC350A-E3/9AT guarantees a maximum reverse leakage current (ID) of 1.0 μA. This ultra-low leakage preserves system efficiency in high-impedance monitoring circuits and extends battery life in always-on sensor nodes - verified per the Electrical Characteristics table in Vishay document 88303.
1.5SMC350A-E3/9AT 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:
- Obsolete
- 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-E3/9AT FAQ
1.How can I place an order for 1.5SMC350A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC350A-E3/9AT 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-E3/9AT reliable?
The price and inventory of 1.5SMC350A-E3/9AT 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-E3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC350A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC350A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC350A-E3/9AT?
1.5SMC350A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC350A-E3/9AT 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-E3/9AT?
For technical support, including 1.5SMC350A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC350A-E3/9AT requirements.
6.How does Aetrix verify that 1.5SMC350A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC350A-E3/9AT 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-E3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC350A-E3/9AT?
All 1.5SMC350A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC350A-E3/9AT, 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-E3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC350A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC350A-E3/9AT Tags
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