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Vishay General Semiconductor - Diodes Division 1.5SMC350AHM3_A/I
- Part No.:
- 1.5SMC350AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC350AHM3_A/I.pdf
- Description:
- TVS DIODE 300VWM 482VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,037
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Product details
Overview
1.5SMC350AHM3_A/I 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 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 - suitable for protecting automotive power supplies and industrial DC bus interfaces against lightning-induced transients.
For engineers reviewing the 1.5SMC350AHM3_A/I datasheet, 1.5SMC350AHM3_A/I pinout, 1.5SMC350AHM3_A/I application, or 1.5SMC350AHM3_A/I equivalent, key selection criteria include its AEC-Q101 qualification, halogen-free RoHS-compliant HM3 suffix, SMC (DO-214AB) package thermal performance (RθJA = 75 °C/W), and unidirectional polarity with cathode band marking.
Technical Context
This TVS diode operates as a voltage-clamping overvoltage protection device, leveraging an avalanche breakdown mechanism to divert transient energy away from sensitive downstream circuitry. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 μA at VWM), while the 10/1000 μs waveform rating reflects standardized surge immunity testing per IEC 61000-4-5.
The 1.5SMC350AHM3_A/I is rated for continuous operation up to TJ = 150 °C and exhibits a temperature coefficient of VBR at +0.110 %/°C - enabling predictable clamping voltage drift across automotive temperature ranges. Its 200 A IFSM rating supports robust handling of repetitive inductive-switching surges without degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off) | 300 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC or AC RMS operating margin. |
| VBR (Breakdown) | 333–368 V at IT = 1.0 mA - Verified avalanche onset range; ensures reliable triggering within specified tolerance under test conditions. |
| VC (Clamping) | 482 V at IPPM = 3.1 A - Peak voltage seen by protected circuit during 10/1000 μs transient; critical for IC/MOSFET voltage headroom design. |
| PPPM | 1500 W - Surge energy absorption capacity using standard 10/1000 μs waveform; validates compliance with Level 4 IEC 61000-4-5. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments and high-ambient industrial settings. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated pick-and-place and reflow. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD; required for powertrain and body electronics. |
Pinout & Package
Package: SMC (DO-214AB), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, MSL level 1 (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | High-side connection in unidirectional configuration | Connected to protected line; conducts surge current toward ground when reverse voltage exceeds VBR. |
| Anode | Low-side reference terminal | Typically tied to system ground or common return; completes current path during transient clamping event. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Enables single-device protection against severe lightning surges (IEC 61000-4-5 Level 4) on 24 V/48 V DC systems without parallel staging. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including engine control units, battery management systems, and ADAS power rails. |
| Glass-passivated junction | Ensures long-term stability of VBR and low leakage (<1 μA) over 15-year field life in harsh thermal/humidity environments. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and IPC-1752A material declarations; supports sustainability and end-of-life recycling requirements. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profiles without baking - reduces manufacturing overhead and risk of popcorning. |
Applications
| Automotive Power Rail Protection | Industrial DC Bus Clamping |
|---|---|
|
Use Scenario: Protecting 24 V battery-fed ECUs from load-dump and jump-start transients in commercial vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor to clamp spikes above 350 V. Use Value: Limits peak voltage to ≤482 V, preserving MOSFET gate oxide integrity and preventing microcontroller brownout resets. |
Use Scenario: Safeguarding PLC analog I/O modules connected to 48 V field wiring exposed to inductive switching noise. IC Role / Device Role / Timing Role: Standoff-rated TVS on power entry stage to absorb repetitive 10/1000 μs surges from solenoid drivers. Use Value: Maintains <1 μA leakage at 300 V, avoiding signal offset errors in precision 24-bit ADC front-ends. |
| Telecom Power Interface | Renewable Energy Inverter DC Link |
|
Use Scenario: Secondary surge suppression on PoE-powered network switches after primary GDT-based protection. IC Role / Device Role / Timing Role: Fast-response clamping device shunting residual transients to chassis ground before reaching PHY ICs. Use Value: 3.1 A IPPM rating handles residual energy from upstream protectors while adding <1 ns response delay. |
Use Scenario: Overvoltage protection on photovoltaic string inputs of residential solar inverters subjected to grid fault coupling. IC Role / Device Role / Timing Role: High-VWM TVS placed across DC link capacitors to prevent overvoltage failure during islanding events. Use Value: 300 V VWM aligns with 1000 VDC PV system derating; 482 V VC avoids tripping DC bus overvoltage thresholds. |
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-E3/52 | Lower PPPM (600 W), SMB package (smaller thermal mass), RθJA = 85 °C/W | Not AEC-Q101 qualified; suited for cost-sensitive consumer power adapters, not automotive. | Select when board space is constrained and surge energy is limited to IEC 61000-4-5 Level 2. |
| 1.5KE350A | Through-hole DO-201 package, same VWM/VC specs, but no AEC-Q101 or halogen-free certification | Limited to non-automotive industrial equipment where manual assembly or wave soldering is used. | Choose only if legacy through-hole layout must be maintained and automotive qualification is unnecessary. |
Compared with SMBJ350A-E3/52 and 1.5KE350A, the 1.5SMC350AHM3_A/I uniquely delivers AEC-Q101 qualification, halogen-free compliance, and 1500 W surge capacity in a surface-mount SMC package - making it the sole option for new automotive designs requiring full PPAP traceability and high-energy clamping.
Availability
1.5SMC350AHM3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, telecom power interfaces, and renewable energy inverters requiring stable component supply with full lifecycle support.
Supply support for 1.5SMC350AHM3_A/I 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, and protection devices with emphasis on reliability and application-specific validation.
The 1.5SMC Series was engineered for high-power transient suppression in automotive, industrial, and telecom infrastructure - prioritizing AEC-Q101 compliance, surge robustness, and surface-mount manufacturability.
FAQ
What is the maximum clamping voltage of the 1.5SMC350AHM3_A/I under a 10/1000 μs surge?
The 1.5SMC350AHM3_A/I 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 standard test conditions (TA = 25 °C, mounted on 8.0 mm × 8.0 mm copper pads) and defines the upper voltage limit imposed on protected circuitry during surge events.
Is the 1.5SMC350AHM3_A/I suitable for automotive applications?
Yes, the 1.5SMC350AHM3_A/I is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction. It is explicitly intended for automotive power rail protection, including engine control units, battery management systems, and ADAS modules where validated reliability under temperature cycling and humidity exposure is mandatory.
What does the "HM3_A/I" suffix mean in 1.5SMC350AHM3_A/I?
In 1.5SMC350AHM3_A/I, "HM3" denotes halogen-free and RoHS-compliant commercial grade with AEC-Q101 qualification; "A" indicates the revision level; and "I" specifies packaging in 13-inch tape-and-reel format with 3500 units per reel - optimized for high-volume SMT production lines.
How does the 1.5SMC350AHM3_A/I differ from bidirectional variants like 1.5SMC350CA?
The 1.5SMC350AHM3_A/I is unidirectional, featuring a cathode band for polarity-sensitive placement and optimized for DC rail protection. In contrast, 1.5SMC350CA is bidirectional with symmetric clamping in both directions - used in AC-coupled signal lines or differential buses where polarity reversal may occur.
What is the thermal resistance of the 1.5SMC350AHM3_A/I, and how does it affect PCB layout?
The 1.5SMC350AHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on minimum recommended 8.0 mm × 8.0 mm copper pads per terminal. To maintain TJ ≤ 150 °C under sustained 6.5 W dissipation, designers must allocate adequate copper area and avoid thermal isolation - especially in enclosed automotive enclosures.
1.5SMC350AHM3_A/I 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:
- Discontinued at Digi-Key
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
1.5SMC350AHM3_A/I FAQ
1.How can I place an order for 1.5SMC350AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC350AHM3_A/I 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 1.5SMC350AHM3_A/I reliable?
The price and inventory of 1.5SMC350AHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC350AHM3_A/I is usually 5 days.
3.What payment methods are accepted for 1.5SMC350AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC350AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC350AHM3_A/I?
1.5SMC350AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC350AHM3_A/I 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 1.5SMC350AHM3_A/I?
For technical support, including 1.5SMC350AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC350AHM3_A/I requirements.
6.How does Aetrix verify that 1.5SMC350AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All 1.5SMC350AHM3_A/I 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 1.5SMC350AHM3_A/I meets industry standards.
7.What is the process for return or replacement of 1.5SMC350AHM3_A/I?
All 1.5SMC350AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC350AHM3_A/I, 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 1.5SMC350AHM3_A/I part is unused and in its original packaging.
Return procedure for 1.5SMC350AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC350AHM3_A/I Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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