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Vishay General Semiconductor - Diodes Division 1.5SMC400A-E3/9AT
- Part No.:
- 1.5SMC400A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC400A-E3/9AT.pdf
- Description:
- TVS DIODE 342VWM 548VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:4,800
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Product details
Overview
1.5SMC400A-E3/9AT 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), 459 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 automotive power supply rails and industrial motor drive I/O protection.
For engineers reviewing the 1.5SMC400A-E3/9AT datasheet, 1.5SMC400A-E3/9AT pinout, 1.5SMC400A-E3/9AT application, or 1.5SMC400A-E3/9AT equivalent, key selection criteria include clamping performance under 10/1000 μs transients, thermal derating above 25 °C, unidirectional polarity marking, SMC (DO-214AB) package compatibility with automated placement, and AEC-Q101 qualification status for automotive use.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse-biased voltage exceeds VBR (437–459 V), it avalanches to divert transient energy away from downstream circuitry. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 μA at 342 V).
The device uses a single P-N junction structure with cathode-band polarity marking, optimized for fast response (<1 ns) and low incremental surge resistance. Thermal performance is defined by RθJA = 75 °C/W and RθJL = 15 °C/W, requiring copper pad layout per JEDEC standard (8.0 mm × 8.0 mm per terminal) for rated 1500 W pulse handling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 342 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC/AC working limit. |
| VBR (Breakdown Voltage) | 437–459 V at 1 mA - Voltage at which avalanche conduction begins; ensures reliable triggering above system nominal voltage. |
| VC (Clamping Voltage) | 548 V at IPPM = 2.7 A - Peak voltage seen by protected circuit during 10/1000 μs surge; determines stress on downstream components. |
| PPPM (Peak Pulse Power) | 1500 W - Energy-handling capacity for standardized 10/1000 μs waveform; supports IEC 61000-4-5 Level 4 compliance. |
| ID (Reverse Leakage) | <1 μA at 342 V - Minimal standby current; avoids loading sensitive reference or bias networks. |
| TJ max. | 150 °C - Maximum junction temperature; sets upper limit for thermal design and ambient derating curves. |
| Package | SMC (DO-214AB) - Surface-mount outline with 7.75 mm × 6.22 mm footprint; compatible with IPC-7351B standard land patterns. |
Pinout & Package
Package: SMC (DO-214AB), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL level 1 (260 °C reflow peak). Cathode identified by black band on body end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-impedance return path; completes shunt path during transient event. |
| Cathode | High-side connection point | Connected to protected line (e.g., 400 V bus); polarity band marks this terminal for correct orientation. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Enables robust protection against IEC 61000-4-5 combined wave surges up to 4 kV without degradation. |
| Glass passivated junction | Ensures stable VBR over lifetime and improved humidity resistance vs. epoxy-passivated alternatives. |
| MSL Level 1 rating | Supports lead-free reflow up to 260 °C without popcorn effect; eliminates pre-bake requirements. |
| RoHS-compliant (E3 suffix) | Meets EU Directive 2011/65/EU and JESD201 Class 2 whisker resistance; suitable for commercial-grade production. |
| Low profile SMC package | 0.220–0.246 inch height enables compact placement near connectors or IC inputs without mechanical interference. |
Applications
| Automotive Power Rail Protection | Industrial Motor Drive I/O |
|---|---|
Use Scenario: Protecting 400 V battery-fed control modules in EV charging interfaces against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between HV rail and chassis ground to clamp transients within 1 ns. Use Value: Limits voltage excursion to ≤548 V during 10/1000 μs surges, preventing gate oxide rupture in SiC MOSFET drivers. |
Use Scenario: Safeguarding encoder feedback lines and analog sensor inputs in servo drives exposed to inductive switching noise. IC Role / Device Role / Timing Role: Standoff-rated TVS suppressing coupled spikes from adjacent 400 V DC link switching events. Use Value: Maintains signal integrity with <1 μA leakage at 342 V, avoiding offset drift in 24-bit ADC front-ends. |
| Telecom DC Power Feeds | Renewable Energy Inverter DC Link |
Use Scenario: Securing -48 V telecom rectifier outputs against lightning-induced surges entering central office equipment. IC Role / Device Role / Timing Role: High-VWM unidirectional TVS mounted at input connector to absorb differential-mode transients before DC/DC converters. Use Value: Withstands repetitive 1500 W pulses at 0.01% duty cycle, enabling long-term reliability in outdoor cabinet deployments. |
Use Scenario: Clamping voltage overshoot on photovoltaic string combiner box outputs during rapid irradiance changes. IC Role / Device Role / Timing Role: Parallel-connected TVS across DC link capacitors to suppress fast-rising transients from grid fault recovery. Use Value: 459 V VBR ensures no conduction during normal 360–420 V MPPT operation while triggering decisively above 437 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ400A-E3/52T | Lower PPPM (600 W), same VWM/VBR range, SMB package (smaller footprint, higher RθJA = 110 °C/W) | Limited to lower-energy transients (IEC 61000-4-5 Level 2); unsuitable for 400 V bus-level protection where 1500 W margin is required. | Select only when space-constrained layouts prohibit SMC and surge threat level is confirmed ≤600 W. |
| 1.5KE400A | Through-hole DO-201 package, identical electrical specs but incompatible with SMT assembly and higher thermal resistance. | Requires manual or wave soldering; not viable for high-volume automated production or thermally demanding PCBs. | Choose only for legacy through-hole designs or prototyping where rework tolerance outweighs production efficiency. |
Compared with SMBJ400A-E3/52T and 1.5KE400A, the 1.5SMC400A-E3/9AT delivers superior surge robustness in an SMT-optimized package, enabling direct integration into automotive and industrial power systems without layout redesign or thermal compromise.
Availability
1.5SMC400A-E3/9AT is available at Aetrix Electronics and suitable for automotive power rail protection, industrial motor drive I/O safeguarding, telecom DC feed hardening, and renewable energy inverter DC link clamping requiring stable component supply and RoHS-compliant sourcing.
Supply support for 1.5SMC400A-E3/9AT 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 application-specific performance.
The 1.5SMC Series targets high-power transient suppression in harsh environments, engineered for automotive, industrial, and telecom infrastructure where sustained surge immunity and AEC-Q101 qualification are mandatory.
FAQ
What is the clamping voltage of the 1.5SMC400A-E3/9AT under a 10/1000 μs surge?
The 1.5SMC400A-E3/9AT exhibits a maximum clamping voltage (VC) of 548 V when subjected to its rated peak pulse current of 2.7 A with a 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 standardized surge events. The 1.5SMC400A-E3/9AT maintains this clamping performance across its operational temperature range when mounted on recommended 8.0 mm × 8.0 mm copper pads.
Is the 1.5SMC400A-E3/9AT AEC-Q101 qualified?
No, the 1.5SMC400A-E3/9AT is not AEC-Q101 qualified. Per Vishay's ordering information, AEC-Q101 variants of the 1.5SMC series begin at 250 V and use the HM3_B or HE3_B suffix (e.g., 1.5SMC400AHM3_B/I). The E3 suffix indicates RoHS-compliant commercial grade only. For automotive applications requiring qualification, engineers must select the appropriate HM3_B variant rather than the 1.5SMC400A-E3/9AT.
What does the "/9AT" suffix indicate in 1.5SMC400A-E3/9AT?
The "/9AT" suffix denotes packaging configuration: 13-inch diameter plastic tape and reel, with 3500 units per reel. This differs from "/57T", which specifies a 7-inch reel containing 850 units. Both share identical electrical and thermal specifications; the distinction is purely logistical and affects pick-and-place feeder compatibility and inventory unit economics. The 1.5SMC400A-E3/9AT is optimized for high-volume SMT line deployment.
How does the 1.5SMC400A-E3/9AT compare to bidirectional TVS diodes like 1.5SMC400CA?
The 1.5SMC400A-E3/9AT is unidirectional and intended for DC circuits with defined polarity, whereas 1.5SMC400CA is bidirectional and suited for AC or floating signal lines. The 1.5SMC400A-E3/9AT has asymmetric conduction (forward voltage ~3.5 V at 100 A), while the CA version clamps equally in both directions. Using the 1.5SMC400A-E3/9AT in AC applications risks forward conduction and failure; always match polarity configuration to system topology.
What is the thermal resistance of the 1.5SMC400A-E3/9AT, and how does it affect layout?
The 1.5SMC400A-E3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-leads resistance (RθJL) of 15 °C/W. To achieve rated 1500 W pulse power, PCB layout must use minimum 8.0 mm × 8.0 mm copper pads per terminal per Vishay's specification. Reducing pad area increases RθJA, causing junction temperature rise and potential derating of pulse capability - the 1.5SMC400A-E3/9AT must be placed accordingly to avoid thermal runaway during repeated surges.
1.5SMC400A-E3/9AT 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:
- Obsolete
- 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-E3/9AT FAQ
1.How can I place an order for 1.5SMC400A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC400A-E3/9AT 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-E3/9AT reliable?
The price and inventory of 1.5SMC400A-E3/9AT 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-E3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC400A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC400A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC400A-E3/9AT?
1.5SMC400A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC400A-E3/9AT 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-E3/9AT?
For technical support, including 1.5SMC400A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC400A-E3/9AT requirements.
6.How does Aetrix verify that 1.5SMC400A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC400A-E3/9AT 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-E3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC400A-E3/9AT?
All 1.5SMC400A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC400A-E3/9AT, 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-E3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC400A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC400A-E3/9AT Tags
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