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Vishay General Semiconductor - Diodes Division 1.5SMC350AHM3_B/I
- Part No.:
- 1.5SMC350AHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC350AHM3_B/I.pdf
- Description:
- TVS DIODE 300VWM 482VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:3,450
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Product details
Overview
1.5SMC350AHM3_B/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 delivers 1500 W peak pulse power (10/1000 μs), clamps transients up to 482 V at 3.1 A, and features a 300 V standoff voltage (VWM) with 333–368 V breakdown (VBR) at 1 mA test current. It is used in automotive power supply rails and industrial DC bus protection.
For engineers reviewing the 1.5SMC350AHM3_B/I datasheet, 1.5SMC350AHM3_B/I pinout, 1.5SMC350AHM3_B/I application, or 1.5SMC350AHM3_B/I equivalent, key selection criteria include clamping voltage under rated IPPM, thermal resistance (RθJA = 75 °C/W), AEC-Q101 qualification status, SMC (DO-214AB) package compatibility, and unidirectional polarity marking.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR, it avalanches to divert surge current away from downstream circuitry. Its glass-passivated junction ensures stable breakdown and low leakage (<1 μA at VWM).
Designed for transient suppression per IEC 61000-4-2 (ESD) and IEC 61000-4-5 (surge), it supports repetitive 0.01% duty cycle pulses and withstands 200 A peak forward surge (8.3 ms half-sine). The SMC package enables automated placement and meets UL 94 V-0 flammability rating.
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 initiation range; ensures predictable clamping onset under surge conditions. |
| VC (Clamping) | 482 V at IPPM = 3.1 A - Maximum voltage seen across device during 10/1000 μs surge; directly limits stress on protected ICs. |
| PPPM | 1500 W - Peak pulse power handling capability; determines survivability against lightning-induced surges per IEC 61000-4-5. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance; informs PCB copper pad sizing (0.31" × 0.31") for thermal derating above 25 °C. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments with proper layout. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness per AEC standard. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, matte tin-plated leads, polarity indicated by cathode band. Molding compound complies with UL 94 V-0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode-side connection point in unidirectional configuration | Connects to protected line; avalanche conduction occurs when cathode-to-anode voltage exceeds VBR. |
| Anode (unmarked end) | Reference/ground return path | Typically tied to system ground or low-impedance return; completes shunt path for surge current diversion. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV line-to-ground) without failure. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive powertrain and body electronics applications requiring extended temperature and life-cycle reliability. |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients, improving protection margin for sensitive MOSFETs and controllers. |
| MSL Level 1 (260 °C reflow) | Supports lead-free soldering without preconditioning; compatible with standard SMT assembly processes. |
| Glass passivated junction | Ensures stable VBR over time and temperature, reducing parameter drift in long-life industrial deployments. |
Applications
| Automotive Power Supply Protection | Industrial DC Bus Surge Suppression |
|---|---|
Use Scenario: Protecting 24 V and 48 V battery-fed ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between power rail and chassis ground to clamp spikes up to ±120 V. Use Value: Limits voltage seen by downstream PMICs and microcontrollers to ≤482 V during 3.1 A surges, preventing latch-up or gate oxide damage. |
Use Scenario: Safeguarding motor drive inverters and PLC power inputs against induced lightning surges on factory floor wiring. IC Role / Device Role / Timing Role: Standoff-rated TVS installed across DC link capacitors to absorb repetitive 1500 W energy bursts. Use Value: Maintains system uptime by surviving >1000 surges at rated PPPM without degradation, verified per AEC-Q101 stress testing. |
| Telecom Line Interface Protection | Renewable Energy Charge Controller Input |
Use Scenario: Shielding PoE-powered Ethernet ports and base station RF front-end supplies from EFT and surge coupling. IC Role / Device Role / Timing Role: High-VWM TVS on 48 V bias rail to suppress common-mode transients while minimizing standby leakage. Use Value: Delivers <1 μA reverse leakage at 300 V, preserving power budget in always-on telecom infrastructure. |
Use Scenario: Guarding solar charge controller inputs against voltage reversals and grid-switching transients in off-grid systems. IC Role / Device Role / Timing Role: Unidirectional clamp on PV+ input to prevent reverse-bias overstress of MPPT controller FETs. Use Value: Withstands 200 A 8.3 ms forward surge (IFSM), protecting against accidental battery reversal or capacitor inrush events. |
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/VBR range, non-AEC-Q101. | Targeted at cost-sensitive consumer and computing applications where 1500 W surge immunity is not required. | Select when board space is constrained and surge threat level is limited to IEC 61000-4-2 only. |
| 1.5KE350A | Through-hole DO-201 package, identical electrical specs but no AEC-Q101 qualification, higher RθJA (~100 °C/W). | Used in legacy industrial power supplies where manual assembly or retrofitting is preferred over SMT. | Choose only if existing through-hole layout prohibits SMC adoption and automotive qualification is unnecessary. |
Compared with 1.5SMC350AHM3_B/I, SMBJ350A-E3/52 trades surge capacity and automotive qualification for compactness, while 1.5KE350A retains full electrical performance but lacks AEC-Q101 validation and SMT process compatibility-making 1.5SMC350AHM3_B/I the sole choice for new automotive SMT designs requiring 1500 W clamping.
Availability
1.5SMC350AHM3_B/I is available at Aetrix Electronics and suitable for automotive ECU protection, industrial DC bus hardening, and renewable energy charge controller input stages requiring stable component supply and AEC-Q101 compliance.
Supply support for 1.5SMC350AHM3_B/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 optimization.
The 1.5SMC Series targets high-energy transient suppression in automotive, industrial, and telecom systems, engineered for robustness under harsh thermal and surge conditions with standardized SMC packaging.
FAQ
What is the clamping voltage of the 1.5SMC350AHM3_B/I at its rated peak pulse current?
The 1.5SMC350AHM3_B/I clamps to a maximum of 482 V when subjected to its rated peak pulse current of 3.1 A (10/1000 μs waveform). This value is measured under standardized test conditions with the device mounted on 0.31" × 0.31" copper pads and represents the upper voltage limit imposed on protected circuitry during surge events. It is critical for verifying margin against downstream component breakdown ratings.
Is the 1.5SMC350AHM3_B/I qualified for automotive applications?
Yes, the 1.5SMC350AHM3_B/I is AEC-Q101 qualified, as confirmed by its HM3 suffix and documentation in Vishay's 1.5SMC series datasheet (Document Number: 88303, Revision: 09-Mar-2026). This qualification covers stress tests including high-temperature reverse bias, temperature cycling, and ESD, making it suitable for under-hood and body electronics in passenger vehicles and commercial vehicles.
What does the "B" in the 1.5SMC350AHM3_B/I part number indicate?
The "B" in 1.5SMC350AHM3_B/I denotes the revision level of the AEC-Q101 qualification for this voltage grade, specifically applying to 1.5SMC250A through 1.5SMC540A devices. Per Vishay's ordering information table, "_B" indicates the AEC-Q101 qualified version for the 350 V standoff family, distinguishing it from earlier "_A" revisions limited to lower-voltage variants.
What is the thermal resistance of the 1.5SMC350AHM3_B/I, and how does it affect PCB layout?
The 1.5SMC350AHM3_B/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. This value requires designers to allocate sufficient copper area and consider ambient temperature derating-especially above 25 °C-to maintain junction temperature below 150 °C during repetitive surge events or elevated steady-state power dissipation.
How does the 1.5SMC350AHM3_B/I differ from bidirectional TVS diodes in the same series?
The 1.5SMC350AHM3_B/I is unidirectional, meaning it conducts only during reverse-biased overvoltage events and blocks forward current like a rectifier. Bidirectional variants (e.g., 1.5SMC350CA) conduct symmetrically in both directions and lack polarity marking. This makes 1.5SMC350AHM3_B/I ideal for DC power rail protection where polarity is fixed, while bidirectional types suit AC or data-line applications with undefined voltage polarity.
1.5SMC350AHM3_B/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:
- 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/I FAQ
1.How can I place an order for 1.5SMC350AHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC350AHM3_B/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_B/I reliable?
The price and inventory of 1.5SMC350AHM3_B/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_B/I is usually 5 days.
3.What payment methods are accepted for 1.5SMC350AHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC350AHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC350AHM3_B/I?
1.5SMC350AHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC350AHM3_B/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_B/I?
For technical support, including 1.5SMC350AHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC350AHM3_B/I requirements.
6.How does Aetrix verify that 1.5SMC350AHM3_B/I is sourced from the original manufacturer or authorized distributors?
All 1.5SMC350AHM3_B/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_B/I meets industry standards.
7.What is the process for return or replacement of 1.5SMC350AHM3_B/I?
All 1.5SMC350AHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC350AHM3_B/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_B/I part is unused and in its original packaging.
Return procedure for 1.5SMC350AHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC350AHM3_B/I Tags
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