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Vishay General Semiconductor - Diodes Division 1.5SMC440A-M3/9AT
- Part No.:
- 1.5SMC440A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC440A-M3/9AT.pdf
- Description:
- TVS DIODE 376VWM 602VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:8,594
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Product details
Overview
1.5SMC440A-M3/9AT from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the SMC (DO-214AB) package, designed for high-energy surge protection. It features a 440 V standoff voltage (VWM), 462 V maximum breakdown voltage (VBR), and clamps transients to 602 V at 2.5 A peak pulse current (IPPM), delivering 1500 W peak pulse power with a 10/1000 μs waveform. It is used to protect power rails and DC inputs in industrial motor drives and telecom power supplies against lightning-induced surges.
For engineers reviewing the 1.5SMC440A-M3/9AT datasheet, 1.5SMC440A-M3/9AT pinout, 1.5SMC440A-M3/9AT application, or 1.5SMC440A-M3/9AT equivalent, this page provides verified electrical parameters, thermal derating behavior, clamping performance under repetitive surge conditions, and halogen-free RoHS-compliant sourcing details aligned with J-STD-020 MSL Level 1.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, leveraging glass-passivated junction technology for stable avalanche response. Its 1500 W peak pulse power rating is defined per 10/1000 μs waveform at TA = 25 °C, with thermal derating above 25 °C per Figure 2 of the datasheet.
The device exhibits 0.110 %/°C temperature coefficient of VBR and 75 °C/W junction-to-ambient thermal resistance (RθJA) on standard 8.0 mm × 8.0 mm copper pads. It supports repetitive surge duty cycles up to 0.01 % and meets AEC-Q101 qualification when ordered with HM3 suffix (not applicable to -M3/9AT).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 376 V - Maximum continuous reverse voltage before significant leakage; defines operating rail margin before clamping initiates |
| VBR (Breakdown Voltage) | 418–462 V at IT = 1.0 mA - Confirmed avalanche onset range; ensures predictable turn-on during overvoltage events |
| VC (Clamping Voltage) | 602 V at IPPM = 2.5 A - Peak voltage seen by protected circuit during full-rated 10/1000 μs transient |
| PPPM (Peak Pulse Power) | 1500 W - Energy-handling capacity for standardized lightning/surge waveforms; validated with 0.01 % duty cycle |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in high-ambient environments like enclosed power modules |
| RθJA | 75 °C/W - Thermal resistance on recommended 8.0 mm × 8.0 mm copper pads; informs heatsinking requirements for sustained surge duty |
| Package | SMC (DO-214AB) - Surface-mount outline with 3.20 mm minimum cathode-to-anode distance; compatible with automated pick-and-place |
Pinout & Package
Package: SMC (DO-214AB), molded plastic case meeting UL 94 V-0 flammability rating; matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode-side reference for unidirectional conduction | Connected to protected line; clamps positive transients to ground when reverse-biased |
| Anode (non-banded end) | Reference terminal for clamping path | Typically tied to system ground or low-impedance return; completes surge current path during overvoltage |
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 derating in standard layouts |
| Glass-passivated chip junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity exposure |
| MSL Level 1 (260 °C peak reflow) | Supports single-pass lead-free reflow assembly without moisture-related popcorning or delamination |
| Halogen-free & RoHS-compliant (M3 suffix) | Fulfills EU Directive 2011/65/EU and IPC-1752A material declaration requirements for green electronics |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns rise time), improving protection fidelity |
Applications
| Industrial Motor Drive DC Bus Protection | Telecom AC/DC Front-End Input |
|---|---|
Use Scenario: Protecting 400 V DC bus rails in variable-frequency drives from switching transients and regenerative energy spikes. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between bus+ and chassis ground to limit voltage excursions during IGBT turn-off. Use Value: Clamps 10/1000 μs surges to ≤602 V, preventing gate oxide damage to downstream 600 V IGBTs and maintaining system uptime. |
Use Scenario: Safeguarding primary-side rectifier outputs in telecom power supplies exposed to AC mains surges and lightning coupling. IC Role / Device Role / Timing Role: Standoff-rated TVS connected across bulk capacitor input to absorb line-to-line and line-to-ground transients. Use Value: Withstands 1500 W pulses without degradation, enabling compliance with GR-1089-CORE Section 4.5.2.2 surge immunity requirements. |
| Renewable Energy Inverter DC Link | Railway Signaling Power Interface |
Use Scenario: Securing DC link capacitors in solar string inverters subjected to rapid PV array voltage transients during cloud-edge events. IC Role / Device Role / Timing Role: High-VWM TVS mounted directly across DC+ and DC− terminals to suppress common-mode overvoltages. Use Value: 376 V VWM allows operation near nominal 400 V DC link while providing 226 V headroom before clamping begins. |
Use Scenario: Protecting 110 V DC signaling interfaces in railway control cabinets from induced surges due to traction current switching. IC Role / Device Role / Timing Role: Unidirectional suppressor installed between signal line and protective earth to divert surge energy away from optocouplers and level shifters. Use Value: 602 V clamping voltage ensures downstream 75 V-rated interface ICs remain within absolute maximum ratings during EN 50121-4-2 tests. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ440A-T | Lower PPPM (600 W), SMB package (smaller footprint), same VWM/VBR range | Not suitable for 1500 W surge events; limited to lower-energy IEC 61000-4-5 Level 2 | Select only if board space is constrained and surge threat level is ≤600 W |
| 1.5KE440A | Through-hole DO-201 package, identical electrical specs but no MSL Level 1 rating | Requires wave soldering; incompatible with modern SMT-only production lines | Choose only for legacy through-hole designs or prototyping where reflow compatibility is not required |
Compared with SMBJ440A-T and 1.5KE440A, the 1.5SMC440A-M3/9AT uniquely delivers 1500 W surge capability in an MSL Level 1–qualified SMT package, enabling direct integration into high-reliability automated manufacturing for industrial and telecom power systems.
Availability
1.5SMC440A-M3/9AT is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, renewable energy inverters, and railway signaling systems requiring stable component supply and halogen-free compliance.
Supply support for 1.5SMC440A-M3/9AT 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive-grade qualification.
The 1.5SMC Series was developed for high-power transient suppression in harsh-environment applications, targeting industrial automation, telecom infrastructure, and transportation systems where robustness and repeatable clamping performance are critical.
FAQ
What is the maximum clamping voltage of the 1.5SMC440A-M3/9AT under rated surge conditions?
The 1.5SMC440A-M3/9AT clamps to a maximum of 602 V when subjected to its rated 2.5 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured at TA = 25 °C on standard 8.0 mm × 8.0 mm copper pads and represents the upper limit of voltage imposed on the protected circuit during full-surge events. The 1.5SMC440A-M3/9AT maintains this clamping performance across its specified operating temperature range, with minor variation governed by its 0.110 %/°C VBR temperature coefficient.
Is the 1.5SMC440A-M3/9AT RoHS-compliant and halogen-free?
Yes, the 1.5SMC440A-M3/9AT carries the M3 suffix, indicating it is both RoHS-compliant and halogen-free per Vishay's material categorization standards (www.vishay.com/doc?99912). It contains no brominated flame retardants, chlorine, or fluorine above threshold limits and satisfies IPC-1752A reporting requirements. The 1.5SMC440A-M3/9AT is certified for use in environmentally regulated markets including the EU and China RoHS.
Does the 1.5SMC440A-M3/9AT meet AEC-Q101 qualification?
No, the 1.5SMC440A-M3/9AT is not AEC-Q101 qualified. AEC-Q101 qualification for the 1.5SMC series applies only to parts with HE3 or HM3 suffixes and revision codes (e.g., 1.5SMC440AHM3_B/I), as noted in the ordering information table. The 1.5SMC440A-M3/9AT is commercial-grade and intended for industrial and telecom applications where automotive qualification is not required.
What is the thermal resistance and how does it affect layout design for the 1.5SMC440A-M3/9AT?
The 1.5SMC440A-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. This value directly impacts PCB layout: reducing pad size or omitting thermal vias increases RθJA, accelerating junction temperature rise during repetitive surges. To maintain safe TJ < 150 °C, designers must follow the recommended pad layout and avoid routing high-current traces adjacent to the device body. The 1.5SMC440A-M3/9AT datasheet Figure 2 provides precise derating curves.
Can the 1.5SMC440A-M3/9AT be used in bidirectional configurations?
No, the 1.5SMC440A-M3/9AT is a unidirectional TVS diode, identifiable by its cathode band marking. Bidirectional operation requires the CA suffix (e.g., 1.5SMC440CA). Using the 1.5SMC440A-M3/9AT in reverse-biased configurations outside its specified unidirectional conduction path risks premature failure or inconsistent clamping. For symmetric surge protection, select the 1.5SMC440CA variant instead of the 1.5SMC440A-M3/9AT.
1.5SMC440A-M3/9AT 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:
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
1.5SMC440A-M3/9AT FAQ
1.How can I place an order for 1.5SMC440A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC440A-M3/9AT 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 1.5SMC440A-M3/9AT reliable?
The price and inventory of 1.5SMC440A-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC440A-M3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC440A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC440A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC440A-M3/9AT?
1.5SMC440A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC440A-M3/9AT 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 1.5SMC440A-M3/9AT?
For technical support, including 1.5SMC440A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC440A-M3/9AT requirements.
6.How does Aetrix verify that 1.5SMC440A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC440A-M3/9AT 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 1.5SMC440A-M3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC440A-M3/9AT?
All 1.5SMC440A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC440A-M3/9AT, 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 1.5SMC440A-M3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC440A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC440A-M3/9AT Tags
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