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Vishay General Semiconductor - Diodes Division 1.5SMC400A-M3/9AT
- Part No.:
- 1.5SMC400A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC400A-M3/9AT.pdf
- Description:
- TVS DIODE 342VWM 548VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:3,469
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Product details
Overview
1.5SMC400A-M3/9AT 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 400 V standoff voltage (VWM), 420 V minimum breakdown voltage (VBR), 548 V maximum clamping voltage (VC) at 2.7 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 µs waveform - deployed in industrial motor drives and telecom power supplies to protect MOSFETs and DC-DC controllers.
For engineers reviewing the 1.5SMC400A-M3/9AT datasheet, 1.5SMC400A-M3/9AT pinout, 1.5SMC400A-M3/9AT application, or 1.5SMC400A-M3/9AT equivalent, key selection criteria include clamping performance under 10/1000 µs surges, thermal resistance (RθJA = 75 °C/W), unidirectional polarity marking, SMC (DO-214AB) package compatibility, and halogen-free RoHS compliance per M3 suffix.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR (380–420 V), it avalanches into low-impedance conduction to divert transient energy away from downstream circuitry. Its glass-passivated junction ensures stable breakdown and low leakage (<1 µA at VWM), while the 1500 W PPPM rating supports repetitive 0.01% duty-cycle surges.
The device is optimized for fast response (<1 ns) and low incremental surge resistance, enabling effective suppression of lightning-induced transients (IEC 61000-4-5) and inductive switching spikes. Its SMC package provides mechanical robustness and thermal dissipation capability (TJmax = 150 °C) on standard 8.0 mm × 8.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 342 V - Maximum continuous reverse operating voltage before significant leakage; defines safe working margin below breakdown. |
| VBR (min/max) | 380 V / 420 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 548 V at 2.7 A - Clamped voltage during full 1500 W surge; determines protected circuit's maximum stress level. |
| PPPM | 1500 W - Peak pulse power handling with 10/1000 µs waveform; validates suitability for IEC 61000-4-5 Level 4 testing. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance; informs PCB copper pad sizing and derating above 25 °C ambient. |
| IFSM | 200 A - Non-repetitive forward surge current (8.3 ms half-sine); supports fault-clearing coordination with upstream fuses. |
| TJmax | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or industrial enclosures. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Cathode indicated by band on body; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line; conducts surge current to ground when VREV > VBR. |
| Anode (unmarked end) | Reference/return path | Typically tied to system ground or low-impedance return; completes shunt path during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 µs) | Validates robustness against lightning surges per IEC 61000-4-5 and ISO 7637-2 without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage stress on protected ICs - critical for 300–400 V rail systems like telecom PSUs. |
| MSL Level 1 (260 °C reflow) | Enables single-pass lead-free assembly without moisture-related popcorning or delamination. |
| Halogen-free & RoHS-compliant (M3 suffix) | Meets IPC-1752A material declaration requirements and EU environmental compliance mandates. |
| 150 °C maximum junction temperature | Supports deployment in high-temperature environments such as industrial motor control cabinets or base station power modules. |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
|
Use Scenario: Protection of IGBT gate drivers and DC bus sensing circuits against switching transients and load dump events. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed across DC bus or gate resistor network to clamp voltage spikes within safe limits. Use Value: Limits VC to 548 V during 1500 W surges, preventing gate oxide rupture in 600 V-class IGBTs and ensuring system uptime. |
Use Scenario: Input-stage surge protection in -48 V telecom rectifiers exposed to lightning-induced common-mode transients. IC Role / Device Role / Timing Role: Unidirectional TVS connected between input line and chassis ground to absorb differential-mode surges. Use Value: Withstands 2.7 A peak pulse at 548 V clamping, maintaining output regulation integrity during IEC 61000-4-5 Level 4 (4 kV) tests. |
| Automotive Body Control Modules | Industrial PLC I/O Modules |
|
Use Scenario: Protection of LIN bus transceivers and power window motor drivers against battery load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Standoff-rated TVS placed on 12 V supply rail to clamp transients before they reach sensitive analog front-ends. Use Value: 342 V VWM provides 20% margin above nominal 28 V systems, while 150 °C TJmax supports under-hood mounting. |
Use Scenario: Field-side protection for 24 V digital input cards exposed to inductive kickback from solenoids and contactors. IC Role / Device Role / Timing Role: Primary surge arrestor on input terminal block, coordinated with series impedance for current limiting. Use Value: Low Rsurge and <1 ns response ensure clamping occurs before microcontroller GPIO damage thresholds are exceeded. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ400A | Same VWM/VBR range but lower PPPM (600 W); SMB package (smaller footprint, higher RθJA = 90 °C/W). | Limited to lower-energy surges; unsuitable for IEC 61000-4-5 Level 4 without parallel devices. | Select when board space is constrained and surge threat level is ≤ Level 3 (2 kV). |
| 1.5KE400A | Through-hole DO-201 package; identical electrical specs but incompatible with SMT assembly and higher RθJA (60 °C/W on larger pads). | Requires manual or wave soldering; not suitable for automated high-volume production. | Choose only for legacy through-hole designs or prototyping where rework tolerance is prioritized over density. |
Compared with SMBJ400A and 1.5KE400A, the 1.5SMC400A-M3/9AT delivers superior surge robustness in SMT-compatible form factor, enabling compact, high-reliability protection for 400 V-class systems without compromising thermal performance or manufacturing scalability.
Availability
1.5SMC400A-M3/9AT is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, automotive body control modules, and PLC I/O modules requiring stable component supply, halogen-free compliance, and AEC-Q101-qualified alternatives.
Supply support for 1.5SMC400A-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, rectifiers, and protection devices with emphasis on reliability, power efficiency, and automotive-grade qualification.
The 1.5SMC Series was engineered for high-power transient suppression in harsh environments - targeting industrial automation, telecom infrastructure, and automotive subsystems where consistent clamping performance and long-term stability are mission-critical.
FAQ
What is the maximum clamping voltage of the 1.5SMC400A-M3/9AT under a 10/1000 µs surge?
The 1.5SMC400A-M3/9AT has a maximum clamping voltage (VC) of 548 V at 2.7 A peak pulse current (IPPM) under the standardized 10/1000 µs waveform. This value is measured per Figure 1 in Vishay document 88303 and defines the upper voltage limit imposed on protected circuitry during full-rated surge events. The 1.5SMC400A-M3/9AT maintains this clamping performance across its operational temperature range.
Is the 1.5SMC400A-M3/9AT RoHS-compliant and halogen-free?
Yes, the 1.5SMC400A-M3/9AT carries the M3 suffix, which explicitly denotes halogen-free and RoHS-compliant construction per Vishay's material categorization standards (document 99912). It meets JESD 201 Class 2 whisker resistance and UL 94 V-0 flammability requirements, making it suitable for environmentally regulated industrial and automotive applications.
Does the 1.5SMC400A-M3/9AT have AEC-Q101 qualification?
No, the 1.5SMC400A-M3/9AT is not AEC-Q101 qualified. Per Vishay's ordering matrix, AEC-Q101 variants for the 400 V rating use the HM3_B suffix (e.g., 1.5SMC400AHM3_B/I). The M3 suffix indicates commercial-grade halogen-free RoHS compliance only; for automotive applications requiring AEC-Q101, the 1.5SMC400AHM3_B series must be specified instead of the 1.5SMC400A-M3/9AT.
What is the thermal resistance of the 1.5SMC400A-M3/9AT, and how does it affect layout?
The 1.5SMC400A-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 requires PCB designers to allocate sufficient copper area and consider ambient temperature derating - for example, at 70 °C ambient, the device's power dissipation must be reduced to maintain TJ ≤ 150 °C. The 1.5SMC400A-M3/9AT's thermal performance is validated per JEDEC JESD51-7.
How is polarity marked on the 1.5SMC400A-M3/9AT, and why does it matter?
The 1.5SMC400A-M3/9AT is a unidirectional TVS diode, and its cathode is marked by a visible band on the SMC (DO-214AB) package body. Correct orientation is essential: the banded end must connect to the line being protected, while the anode connects to ground or reference. Reversal would prevent clamping during positive transients and could cause catastrophic failure under reverse bias beyond VWM. The 1.5SMC400A-M3/9AT's polarity marking follows JEDEC DO-214AB standard conventions.
1.5SMC400A-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):
- 342V
- Voltage - Breakdown (Min):
- 380V
- Voltage - Clamping (Max) @ Ipp:
- 548V
- Current - Peak Pulse (10/1000µs):
- 2.7A
- 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)
1.5SMC400A-M3/9AT FAQ
1.How can I place an order for 1.5SMC400A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC400A-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 1.5SMC400A-M3/9AT reliable?
The price and inventory of 1.5SMC400A-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 1.5SMC400A-M3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC400A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC400A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC400A-M3/9AT?
1.5SMC400A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC400A-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 1.5SMC400A-M3/9AT?
For technical support, including 1.5SMC400A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC400A-M3/9AT requirements.
6.How does Aetrix verify that 1.5SMC400A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC400A-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 1.5SMC400A-M3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC400A-M3/9AT?
All 1.5SMC400A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC400A-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 1.5SMC400A-M3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC400A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC400A-M3/9AT Tags
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