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Vishay General Semiconductor - Diodes Division 1.5SMC440A-E3/9AT
- Part No.:
- 1.5SMC440A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC440A-E3/9AT.pdf
- Description:
- TVS DIODE 376VWM 602VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:9,122
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Product details
Overview
1.5SMC440A-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 440 V standoff voltage (VWM), 462 V maximum breakdown voltage (VBR), 1500 W peak pulse power (10/1000 µs), 2.5 A peak pulse current (IPPM), and clamps transients to 602 V at rated surge. It is used in automotive power distribution modules to protect 400 V DC bus circuits from load dump and ISO 7637-2 pulses.
For engineers reviewing the 1.5SMC440A-E3/9AT datasheet, 1.5SMC440A-E3/9AT pinout, 1.5SMC440A-E3/9AT application, or 1.5SMC440A-E3/9AT equivalent, key selection criteria include unidirectional polarity, SMC (DO-214AB) package compatibility, 602 V clamping performance at 2.5 A, and AEC-Q101 qualification status - critical for under-hood automotive electronics requiring robust transient immunity.
Technical Context
This TVS diode operates as a voltage-clamped crowbar device: when reverse-biased voltage exceeds its breakdown threshold (418–462 V), it avalanches rapidly (<1 ns response) to divert surge current away from downstream circuitry. Its glass-passivated junction ensures stable leakage (<1 µA at 376 V) and long-term reliability under repetitive surges.
The 1.5SMC440A-E3/9AT is thermally optimized for surface-mount PCB layouts with 8.0 mm × 8.0 mm copper pads per terminal, delivering 75 °C/W junction-to-ambient thermal resistance. It supports unidirectional protection only, with cathode marked by a band, and is not rated for bidirectional operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 376 V - Maximum continuous reverse operating voltage before conduction begins; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 418–462 V at 1 mA - Voltage range at which avalanche conduction initiates; 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 surge; determines stress on downstream components. |
| PPPM (Peak Pulse Power) | 1500 W - Maximum transient energy absorption capability under standard 10/1000 µs waveform; enables protection against severe lightning-induced or inductive-switching surges. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 6.22 mm body and 2.62 mm height; compatible with automated pick-and-place and reflow soldering. |
| Polarity | Unidirectional - Cathode identified by molded band; blocks forward current above ~3.5 V, conducts only in reverse avalanche mode. |
| Operating Temperature | −65 °C to +150 °C - Full junction temperature range supporting under-hood automotive deployment without derating loss. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, two-terminal device with molded cathode band marking. Dimensions: 7.75 mm × 6.22 mm × 2.62 mm (L × W × H). Terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or low-impedance return path; forms current sink during avalanche conduction. |
| Cathode | High-side protected line input | Connected to line being protected (e.g., 400 V DC bus); marked by visible band; carries full surge current into anode during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 µs) | Enables single-device protection against ISO 7637-2 Pulse 5a (load dump) in 48 V and 400 V automotive systems without parallel staging. |
| Glass-passivated junction | Ensures stable leakage current (<1 µA at 376 V) and long-term parameter stability across temperature and lifetime cycling. |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free reflow profiles without moisture-related popcorning or delamination risk. |
| RoHS-compliant, halogen-free option available | E3 suffix confirms compliance with EU RoHS Directive 2011/65/EU and JEDEC JS709E halogen-free requirements. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ESD or switching spikes), improving clamping fidelity. |
Applications
| Automotive Power Distribution | Industrial DC Link Protection |
|---|---|
|
Use Scenario: Protecting 400 V battery bus in electric vehicle power distribution units from load dump transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed across DC bus inputs to clamp surges within 1 ns of onset. Use Value: Limits transient voltage to ≤602 V at 2.5 A, preventing gate oxide rupture in 650 V SiC MOSFETs and ensuring system-level ASIL-B compliance. |
Use Scenario: Safeguarding rectified 380 V AC–DC output stages in industrial motor drives from inductive kickback. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between DC+ and chassis ground to absorb regenerative energy spikes. Use Value: Absorbs 1500 W pulses without degradation, eliminating need for external snubbers and reducing BOM count by one passive component. |
| Telecom DC Feeder Lines | Renewable Energy Inverter Inputs |
|
Use Scenario: Protecting −48 V or +24 V telecom DC feeder lines from lightning-induced surges entering via outdoor cabling. IC Role / Device Role / Timing Role: Primary overvoltage clamp at power entry point, upstream of DC/DC converters and PMICs. Use Value: Withstands repeated 10/1000 µs surges up to 2.5 A while maintaining <1 µA leakage at 376 V, preserving standby power integrity. |
Use Scenario: Shielding PV string combiner box inputs from lightning surges on solar farm DC strings operating up to 1500 V. IC Role / Device Role / Timing Role: Secondary-level clamping device after gas discharge tube (GDT) front-end, handling residual energy. Use Value: Provides precise 602 V clamping to prevent cascaded failure of MPPT controllers and isolation amplifiers rated for 650 V absolute max. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ440A | Same VWM (376 V), identical SMC package, but lower PPPM (400 W) and higher VC (648 V at 2.3 A). | Not suitable for 1500 W load dump; limited to lower-energy IEC 61000-4-5 surges. | Select only if system-level surge energy is confirmed ≤400 W and layout space constraints prohibit larger packages. |
| ON Semiconductor 1.5KE440A | Through-hole DO-201 package (not SMC), same VWM/VC specs, but higher RθJA (100 °C/W) and no MSL-1 rating. | Requires manual assembly or wave soldering; incompatible with high-density SMT production lines. | Choose only for legacy through-hole designs or prototyping where reflow compatibility is not required. |
Compared with Littelfuse SMAJ440A and ON Semi 1.5KE440A, the 1.5SMC440A-E3/9AT delivers 3.75× higher surge power handling in an MSL-1–qualified SMT package, enabling direct integration into automotive-grade automated manufacturing without thermal or layout compromises.
Availability
1.5SMC440A-E3/9AT is available at Aetrix Electronics and suitable for automotive power distribution, industrial DC link protection, telecom DC feeder lines, and renewable energy inverter inputs requiring stable component supply, AEC-Q101–aligned sourcing, and RoHS-compliant packaging.
Supply support for 1.5SMC440A-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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and automotive-grade qualification.
The 1.5SMC Series was engineered specifically for high-power transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where 1500 W surge immunity and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of the 1.5SMC440A-E3/9AT and how is it measured?
The 1.5SMC440A-E3/9AT has a maximum clamping voltage (VC) of 602 V, measured at a peak pulse current (IPPM) of 2.5 A using the standardized 10/1000 µs double-exponential surge waveform. This value represents the highest voltage the device allows across its terminals during full-rated surge conduction, directly defining the stress imposed on downstream components. The 1.5SMC440A-E3/9AT achieves this clamping performance while maintaining low incremental resistance, ensuring consistent behavior across multiple surge events.
Is the 1.5SMC440A-E3/9AT AEC-Q101 qualified?
No - the 1.5SMC440A-E3/9AT is RoHS-compliant and commercial-grade (E3 suffix), but not AEC-Q101 qualified. AEC-Q101 versions use HE3 or HM3 suffixes and revision codes (e.g., 1.5SMC440AHE3_B), with _B denoting AEC-Q101 qualification for devices ≥250 V. The 1.5SMC440A-E3/9AT meets all electrical and mechanical specs of the series but lacks the extended reliability testing required for automotive under-hood deployment.
What does the "/9AT" suffix indicate in 1.5SMC440A-E3/9AT?
The "/9AT" suffix denotes packaging: 3500 units per 13-inch diameter plastic tape-and-reel. This format supports high-volume SMT assembly with standard pick-and-place feeders. The "E3" prefix confirms RoHS compliance and commercial-grade qualification, while "9AT" is purely a packaging code - it does not affect electrical parameters, thermal ratings, or reliability characteristics of the 1.5SMC440A-E3/9AT.
Can the 1.5SMC440A-E3/9AT be used in bidirectional applications?
No - the 1.5SMC440A-E3/9AT is strictly unidirectional. Its cathode band marking and electrical specifications (e.g., VBR min/max, ID test conditions) apply only to reverse-bias operation. For bidirectional protection, Vishay specifies CA-suffixed parts like 1.5SMC440CA. Using the 1.5SMC440A-E3/9AT in bidirectional configurations risks forward conduction damage and invalidates all published clamping and surge ratings.
What is the thermal resistance of the 1.5SMC440A-E3/9AT and how does it impact layout?
The 1.5SMC440A-E3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. This value assumes minimum recommended pad layout per Vishay's datasheet; reducing pad area increases thermal resistance and may cause premature thermal runaway during repetitive surges. Layout must allocate sufficient copper area and avoid thermal isolation to maintain safe junction temperatures below 150 °C under worst-case duty cycles.
1.5SMC440A-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):
- 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-E3/9AT FAQ
1.How can I place an order for 1.5SMC440A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC440A-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 1.5SMC440A-E3/9AT reliable?
The price and inventory of 1.5SMC440A-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 1.5SMC440A-E3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC440A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC440A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC440A-E3/9AT?
1.5SMC440A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC440A-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 1.5SMC440A-E3/9AT?
For technical support, including 1.5SMC440A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC440A-E3/9AT requirements.
6.How does Aetrix verify that 1.5SMC440A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC440A-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 1.5SMC440A-E3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC440A-E3/9AT?
All 1.5SMC440A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC440A-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 1.5SMC440A-E3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC440A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC440A-E3/9AT Tags
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