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Vishay General Semiconductor - Diodes Division 1.5SMC440AHM3_B/I
- Part No.:
- 1.5SMC440AHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC440AHM3_B/I.pdf
- Description:
- TVS DIODE 376VWM 602VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:5,652
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Product details
Overview
1.5SMC440AHM3_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 features a 440 V standoff voltage (VWM), 462 V maximum breakdown voltage (VBR), 1500 W peak pulse power rating (10/1000 µs), and clamps transients to 602 V at 2.5 A peak pulse current - deployed in automotive power supply rails, industrial motor drive I/O protection, and telecom DC feed circuits.
For engineers reviewing the 1.5SMC440AHM3_B/I datasheet, 1.5SMC440AHM3_B/I pinout, 1.5SMC440AHM3_B/I application, or 1.5SMC440AHM3_B/I equivalent, key selection criteria include its AEC-Q101 qualification, SMC (DO-214AB) package thermal performance (RθJL = 15 °C/W), unidirectional polarity with cathode band marking, and compliance with UL 497B for protector classification.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, conducting only when reverse voltage exceeds VBR (418–462 V). Its glass-passivated junction ensures stable avalanche characteristics and low leakage (<1 µA at VWM), while the 10/1000 µs waveform rating reflects standardized lightning-surge immunity testing per ANSI/IEEE C62.35.
The device is rated for continuous operation up to TJ = 150 °C and derates linearly above TA = 25 °C per Figure 2. Its MSL Level 1 moisture sensitivity and 260 °C lead-free reflow compatibility support automated SMT assembly without preconditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off) | 376 V - Maximum continuous reverse operating voltage before significant conduction begins; defines safe DC bias margin. |
| VBR (Breakdown) | 418–462 V at IT = 1 mA - Voltage range where avalanche conduction initiates reliably; used for tolerance-based design margining. |
| VC (Clamping) | 602 V at IPPM = 2.5 A - Peak voltage seen by protected circuit during 10/1000 µs surge; determines minimum IC withstand rating. |
| PPPM | 1500 W - Surge energy handling capacity under standard 10/1000 µs waveform; enables robust lightning and EFT protection. |
| TJ max. | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and high-ambient industrial environments. |
| RθJL | 15 °C/W - Junction-to-leads thermal resistance; informs PCB copper pad sizing (0.31" × 0.31") for reliable power dissipation. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD; suffix HM3 denotes halogen-free RoHS + AEC-Q101. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, molded plastic case with matte tin-plated leads. Cathode indicated by band on one end; anode is opposite terminal. Meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | High-side connection point for unidirectional clamping | Connected to protected line (e.g., 48 V rail); conducts surge current to ground when voltage exceeds VBR. |
| Anode | Low-side reference terminal | Typically tied to system ground or common return; completes clamping path during transient events. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 µs) | Enables single-device protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 48 V systems without cascading devices. |
| Glass-passivated junction | Ensures stable, repeatable avalanche behavior over lifetime and temperature; eliminates parameter drift due to surface contamination. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT processes without baking or special handling; reduces manufacturing cost and risk. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including engine control modules, body electronics, and ADAS power supplies. |
| UL 497B recognized (QVGQ2) | Meets safety requirements for telecom and industrial protectors; simplifies end-equipment certification. |
Applications
| Automotive Power Rail Protection | Industrial Motor Drive I/O |
|---|---|
Use Scenario: Protecting 48 V battery-fed ECUs from load dump and alternator transients in mild-hybrid vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC/DC input to clamp spikes up to ±120 V. Use Value: Withstands 1500 W surges and operates up to +150 °C, eliminating need for external heatsinking in compact under-hood layouts. |
Use Scenario: Safeguarding digital I/O ports of PLC modules connected to solenoid valves and contactors. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing inductive kickback (L di/dt) from 24 V DC coils during switching. Use Value: Clamps to 602 V within nanoseconds, preventing latch-up or gate oxide damage in isolated RS-485 transceivers. |
| Telecom DC Feed Protection | Renewable Energy Inverter DC Link |
Use Scenario: Shielding PoE-powered equipment (e.g., remote radios) from induced surges on long outdoor DC feeder lines. IC Role / Device Role / Timing Role: Primary surge suppression stage upstream of DC-DC converter, rated for UL 497B Class B. Use Value: UL recognition and 376 V VWM allow direct integration into telecom infrastructure without additional certification burden. |
Use Scenario: Protecting IGBT gate drivers and sensing circuits in solar string inverters exposed to lightning-induced grid transients. IC Role / Device Role / Timing Role: Clamp device across DC bus capacitors to limit overvoltage during fast-rising grid faults. Use Value: High 440 V VWM matches 600 V-class DC link designs; 1500 W rating handles repetitive surge stress in outdoor installations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ440A-E3/52T | Lower PPPM (600 W), SMB package (smaller thermal mass), same VWM/VBR range | Better suited for space-constrained consumer electronics; insufficient for automotive load dump per ISO 7637-2 Pulse 5a | Select only if surge energy is ≤600 W and board area is critical; verify RθJA derating for ambient >85 °C. |
| 1.5KE440A | Through-hole DO-201 package, identical electrical specs but no AEC-Q101 or MSL Level 1 rating | Limited to non-automotive industrial use; incompatible with high-volume SMT lines | Choose only for legacy through-hole designs or prototyping; not recommended for new automotive or high-reliability production. |
Compared with SMBJ440A-E3/52T and 1.5KE440A, the 1.5SMC440AHM3_B/I uniquely combines AEC-Q101 qualification, 1500 W surge capability, and SMC package thermal performance - making it the only option qualified for under-hood automotive deployment with zero layout redesign.
Availability
1.5SMC440AHM3_B/I is available at Aetrix Electronics and suitable for automotive power rail protection, industrial motor drive I/O safeguarding, and telecom DC feed circuits requiring stable component supply across multi-year production cycles.
Supply support for 1.5SMC440AHM3_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 validation.
The 1.5SMC Series was engineered for high-power transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where failure modes must be mitigated without compromising size or manufacturability.
FAQ
What is the maximum clamping voltage of the 1.5SMC440AHM3_B/I under a 10/1000 µs surge?
The 1.5SMC440AHM3_B/I clamps to a maximum of 602 V at its rated peak pulse current of 2.5 A under the standardized 10/1000 µs waveform. This value is measured per Figure 1 and Table on page 2 of Vishay document 88303 and defines the upper voltage limit imposed on protected circuitry during surge events.
Is the 1.5SMC440AHM3_B/I suitable for automotive applications?
Yes, the 1.5SMC440AHM3_B/I is AEC-Q101 qualified (denoted by the HM3 suffix) and specifically validated for automotive use including engine control units, body electronics, and ADAS power supplies. Its 1500 W surge rating, +150 °C junction rating, and MSL Level 1 reflow compatibility meet stringent automotive manufacturing and reliability requirements.
What does the "HM3" suffix indicate in 1.5SMC440AHM3_B/I?
The "HM3" suffix in 1.5SMC440AHM3_B/I indicates halogen-free, RoHS-compliant construction with full AEC-Q101 qualification. The "B" denotes revision level for devices in the 250–540 V range, and "I" specifies packaging in 13-inch tape-and-reel (3500 units per reel), per Vishay's ordering information table on page 3 of document 88303.
How does the 1.5SMC440AHM3_B/I differ from bidirectional TVS diodes like 1.5SMC440CA?
The 1.5SMC440AHM3_B/I is unidirectional and features a cathode band for polarity-sensitive placement, enabling asymmetric clamping in DC systems. In contrast, 1.5SMC440CA is bidirectional with no polarity marking and symmetric clamping - suitable for AC lines or differential signals but unsuitable for DC rail protection where reverse conduction must be blocked.
What PCB pad layout is recommended for optimal thermal performance of the 1.5SMC440AHM3_B/I?
Vishay specifies mounting the 1.5SMC440AHM3_B/I on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal to achieve rated power dissipation and thermal resistance (RθJL = 15 °C/W). Smaller pads increase junction temperature and reduce surge endurance; this layout is defined in the "Mechanical Data" section and Figure 2 of document 88303.
1.5SMC440AHM3_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):
- 376V
- Voltage - Breakdown (Min):
- 418V
- Voltage - Clamping (Max) @ Ipp:
- 602V
- Current - Peak Pulse (10/1000µs):
- 2.5A
- 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)
1.5SMC440AHM3_B/I FAQ
1.How can I place an order for 1.5SMC440AHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC440AHM3_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 1.5SMC440AHM3_B/I reliable?
The price and inventory of 1.5SMC440AHM3_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 1.5SMC440AHM3_B/I is usually 5 days.
3.What payment methods are accepted for 1.5SMC440AHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC440AHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC440AHM3_B/I?
1.5SMC440AHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC440AHM3_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 1.5SMC440AHM3_B/I?
For technical support, including 1.5SMC440AHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC440AHM3_B/I requirements.
6.How does Aetrix verify that 1.5SMC440AHM3_B/I is sourced from the original manufacturer or authorized distributors?
All 1.5SMC440AHM3_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 1.5SMC440AHM3_B/I meets industry standards.
7.What is the process for return or replacement of 1.5SMC440AHM3_B/I?
All 1.5SMC440AHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC440AHM3_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 1.5SMC440AHM3_B/I part is unused and in its original packaging.
Return procedure for 1.5SMC440AHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC440AHM3_B/I Tags
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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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Toshiba Semiconductor and Storage
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Diodes Incorporated
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