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Vishay General Semiconductor - Diodes Division 1.5SMC350AHM3_B/H
- Part No.:
- 1.5SMC350AHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC350AHM3_B/H.pdf
- Description:
- TVS DIODE 300VWM 482VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:6,336
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Product details
Overview
1.5SMC350AHM3_B/H 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 (PPPM) with 10/1000 µs waveform - deployed in automotive power supply rails, industrial motor drives, and telecom DC input stages.
For engineers reviewing the 1.5SMC350AHM3_B/H datasheet, 1.5SMC350AHM3_B/H pinout, 1.5SMC350AHM3_B/H application, or 1.5SMC350AHM3_B/H equivalent, key selection criteria include clamping performance under 10/1000 µs transients, AEC-Q101 qualification status, thermal resistance (RθJA = 75 °C/W), and compatibility with SMC (DO-214AB) PCB footprints.
Technical Context
This device operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve fast response (<1 ns) and low incremental surge resistance. Its breakdown voltage (VBR) is specified at 333–368 V (min/max) with 1 mA test current, and it exhibits a temperature coefficient of +0.110 %/°C - critical for stable clamping across automotive temperature ranges (−65 °C to +150 °C).
The 1.5SMC350AHM3_B/H is rated for 200 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), supports halogen-free RoHS compliance (HM3 suffix), and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Polarity is marked by a cathode band; no marking on bidirectional variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off) | 300 V - Maximum continuous reverse voltage before conduction begins; defines safe operating margin below clamping threshold |
| VBR (Breakdown) | 333–368 V at 1 mA - Confirmed 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 10/1000 µs surge; determines downstream component stress |
| PPPM | 1500 W - Surge energy handling capacity with standard 10/1000 µs waveform; enables robust lightning/inductive-switching protection |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on recommended 8.0 mm × 8.0 mm copper pads; informs heatsinking requirements |
| TJ max. | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and industrial environments |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD; suffix HM3_B denotes qualification |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads solderable per J-STD-002. Dimensions: 7.11 mm × 6.22 mm × 2.62 mm (L × W × H). Mounting requires 0.31″ × 0.31″ (8.0 mm × 8.0 mm) copper pads per terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode-side connection in unidirectional configuration | Connected to protected line; conducts when transient exceeds VBR, shunting current to ground |
| Anode | Ground reference terminal | Typically tied to system ground or low-impedance return path; completes clamping loop during surge |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Enables protection against IEC 61000-4-5 Level 4 surges (4 kV line-earth) without derating in standard layouts |
| AEC-Q101 qualified (HM3_B) | Validated for automotive powertrain and body electronics where long-term reliability under thermal cycling is mandatory |
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift in harsh environments |
| Low RθJL (15 °C/W) | Supports efficient heat transfer from junction to PCB leads, reducing thermal runaway risk during repetitive transients |
| MSL Level 1 (260 °C peak) | Permits standard lead-free reflow assembly without preconditioning or special handling |
Applications
| Automotive Power Supply Protection | Industrial Motor Drive DC Bus |
|---|---|
Use Scenario: Protecting 24 V/48 V battery-fed ECUs from load dump (ISO 16750-2) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and regulator input to clamp transients above 300 V. Use Value: Clamps 482 V at 3.1 A, limiting stress on downstream LDOs and microcontrollers during 120 V/500 ms load dump events. |
Use Scenario: Safeguarding IGBT gate drivers and bus capacitors against switching-induced voltage spikes in 3-phase inverters. IC Role / Device Role / Timing Role: Mounted across DC link to absorb inductive kickback from motor windings during PWM commutation. Use Value: 1500 W PPPM rating handles repetitive 10/1000 µs spikes up to 3.1 A without degradation, extending capacitor life. |
| Telecom DC Input Stage | Renewable Energy Charge Controller |
Use Scenario: Shielding PoE-powered equipment front-ends from induced surges on outdoor Ethernet cables. IC Role / Device Role / Timing Role: Primary-level TVS on 48 V DC input, upstream of DC/DC converter, oriented cathode-to-rail. Use Value: 300 V VWM provides sufficient margin above nominal 48 V, while 482 V VC prevents overvoltage damage to isolated flyback controllers. |
Use Scenario: Protecting solar charge controller inputs from lightning-induced surges on PV string wiring. IC Role / Device Role / Timing Role: Installed between PV+ and chassis ground to divert common-mode transients exceeding 300 V. Use Value: AEC-Q101 qualification ensures survivability in outdoor enclosures exposed to wide ambient temperature swings (−40 °C to +85 °C). |
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 footprint), same VWM/VC range | Not AEC-Q101 qualified; suited for cost-sensitive consumer or non-automotive industrial use | Select when board space is constrained and 600 W surge rating suffices; verify thermal margin with RθJA = 90 °C/W |
| 1.5KE350A | Through-hole DO-201 package, identical electrical specs but higher RθJA (100 °C/W), no AEC-Q101 | Used in legacy designs or prototyping where manual assembly or socketing is preferred | Choose only for through-hole compatibility; avoid in high-density or automotive production due to mounting and reliability limitations |
Compared with SMBJ350A-E3/52 and 1.5KE350A, the 1.5SMC350AHM3_B/H delivers superior surge robustness (1500 W vs. 600 W or 1500 W with inferior thermal performance), AEC-Q101 validation, and optimized SMC layout for automated manufacturing - making it the preferred choice for volume automotive and industrial deployments requiring long-term field reliability.
Availability
1.5SMC350AHM3_B/H is available at Aetrix Electronics and suitable for automotive power modules, industrial motor drives, telecom infrastructure, and renewable energy systems requiring stable component supply, AEC-Q101 compliance, and high-energy transient immunity.
Supply support for 1.5SMC350AHM3_B/H 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The 1.5SMC Series targets high-power transient suppression in demanding environments; its design prioritizes automotive-grade ruggedness, high-peak-power capability, and surface-mount manufacturability for next-generation power electronics.
FAQ
What is the clamping voltage of the 1.5SMC350AHM3_B/H under a 10/1000 µs surge?
The 1.5SMC350AHM3_B/H has a maximum clamping voltage (VC) of 482 V at 3.1 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per Figure 1 in the Vishay datasheet (Document Number: 88303) and defines the upper voltage limit imposed on protected circuits during standardized surge events. The 1.5SMC350AHM3_B/H maintains this clamping performance across its full operating temperature range.
Is the 1.5SMC350AHM3_B/H AEC-Q101 qualified?
Yes, the 1.5SMC350AHM3_B/H is AEC-Q101 qualified. The "HM3_B" suffix explicitly denotes halogen-free, RoHS-compliant construction with full AEC-Q101 stress testing (including HTGB, HTRB, TCT, and ESD). This qualification is confirmed in the Ordering Information table on page 3 of the Vishay 1.5SMC Series datasheet (Rev. 09-Mar-2026, Doc. #88303).
What is the standoff voltage (VWM) and breakdown voltage (VBR) range for the 1.5SMC350AHM3_B/H?
The 1.5SMC350AHM3_B/H has a standoff voltage (VWM) of 300 V and a breakdown voltage (VBR) range of 333 V (min) to 368 V (max) at 1 mA test current. These values are listed in the Electrical Characteristics table on page 2 of the Vishay datasheet (Doc. #88303) and define the device's conduction threshold and safe continuous operating limit.
Which package does the 1.5SMC350AHM3_B/H use, and what are its key mechanical features?
The 1.5SMC350AHM3_B/H uses the SMC (DO-214AB) package: surface-mount, 7.11 mm × 6.22 mm × 2.62 mm, with matte tin-plated leads compliant with J-STD-002. It features UL 94 V-0 molding compound, MSL Level 1 rating (260 °C peak reflow), and a cathode band marking. Pad layout requires 8.0 mm × 8.0 mm copper areas per terminal for thermal performance.
Can the 1.5SMC350AHM3_B/H be used in bidirectional configurations?
No, the 1.5SMC350AHM3_B/H is a unidirectional TVS diode. Bidirectional variants in the 1.5SMC Series use the "CA" suffix (e.g., 1.5SMC350CA). The "A" suffix in 1.5SMC350AHM3_B/H indicates unidirectional polarity, with the cathode band identifying the high-side terminal - using it in reverse or as a bidirectional device violates its specified electrical behavior and may cause failure.
1.5SMC350AHM3_B/H 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
1.5SMC350AHM3_B/H FAQ
1.How can I place an order for 1.5SMC350AHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC350AHM3_B/H 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_B/H reliable?
The price and inventory of 1.5SMC350AHM3_B/H 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_B/H is usually 5 days.
3.What payment methods are accepted for 1.5SMC350AHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC350AHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC350AHM3_B/H?
1.5SMC350AHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC350AHM3_B/H 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_B/H?
For technical support, including 1.5SMC350AHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC350AHM3_B/H requirements.
6.How does Aetrix verify that 1.5SMC350AHM3_B/H is sourced from the original manufacturer or authorized distributors?
All 1.5SMC350AHM3_B/H 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_B/H meets industry standards.
7.What is the process for return or replacement of 1.5SMC350AHM3_B/H?
All 1.5SMC350AHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC350AHM3_B/H, 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_B/H part is unused and in its original packaging.
Return procedure for 1.5SMC350AHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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