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    1. Home/
    2. All Categories/
    3. Circuit Protection/
    4. ESD Protection Diodes / TVS Diodes/
    5. SM4T21AY STMicroelectronics
    Product FAQ

    1. Is SM4T21AY available for RFQ?

    Yes. SM4T21AY by STMicroelectronics is available for RFQ. Submit your required quantity and our team will confirm real-time stock, lead time, and volume pricing.

    2. Why is there no fixed price for SM4T21AY?

    Pricing for SM4T21AY can vary by order quantity, market availability, date code, packaging, and delivery destination. Request a quote to receive the latest volume pricing.

    3. What are the key specifications of SM4T21AY?

    SM4T21AY is a STMicroelectronics ESD Protection Diodes / TVS Diodes with Packaging: Tape & Reel (TR) and Moisture Sensitivity Level (MSL): 1 (Unlimited) and Voltage - Clamping (Max) @ Ipp: 39.3V. Review the product details or submit an RFQ if you need confirmation before purchase.

    4. How fast can I get a quote for SM4T21AY?

    Our sales team usually responds within 24 hours after receiving your RFQ. The quote may include stock status, unit price, lead time, shipping options, and available alternatives.

    5. How soon can SM4T21AY be shipped?

    If stock is confirmed, in-stock parts can usually ship within 1–2 business days. Final lead time depends on quantity, stock source, and delivery destination.

    6. Can you suggest alternatives to SM4T21AY?

    Yes. If SM4T21AY is unavailable, obsolete, or does not meet your required lead time, we can help check similar STMicroelectronics ESD Protection Diodes / TVS Diodes parts or compatible alternatives.

    RFQ

    Part Number:

    SM4T21AY

    Manufacturer:

    STMicroelectronics

    Looking for Pricing? Contact us for volume pricing.

    Shipping & Warranty

    Fast Dispatch: Ships in 5-7 days(in-stock parts within 1-2 days)

    Unishop Global Export: 1-7 days, $40.00

    Guaranteed Delivery: Door-to-door in 30 days

    Compliant Worldwide Shipping: DHL, FedEx, SF, and UPS.

    Feature

    IMPORTANT NOTICE

    Quotations are subject to stock availability and may vary with market conditions. Prices and lead times are not guaranteed until a purchase order is confirmed. Ensure your contact details are correct to avoid delays in response.

    SM4T21AY [STMicroelectronics]

    SM4T21AY
    SM4T21AY

    Part No:

    SM4T21AY

    Category:

    ESD Protection Diodes / TVS Diodes

    Manufacturer:

    STMicroelectronics

    RoHS Status:

    Datasheet:

    Stock Status:

    Available for RFQ

    Pricing:

    Request Volume Pricing

    Quote Response:

    Within 24 Hours

    Shipping:

    In-stock parts ship in 1–2 business days

    Specification

    Type
    Parameter
    Lifecycle Status
    ACTIVE (Last Updated: 6 months ago)
    Factory Lead Time
    17 Weeks
    Contact Plating
    Tin
    Mount
    Surface Mount
    Mounting Type
    Surface Mount
    Package / Case
    DO-214AC, SMA
    Number of Pins
    2
    Diode Element Material
    SILICON
    Operating Temperature
    -55°C~150°C TJ
    Packaging
    Tape & Reel (TR)
    JESD-609 Code
    e3

    Documents

    Datasheets:

    SM4TY
    Featured Product
    Part Status
    Active
    Moisture Sensitivity Level (MSL)
    1 (Unlimited)
    Number of Terminations
    2
    ECCN Code
    EAR99
    Type
    Zener
    Applications
    Automotive
    Max Power Dissipation
    400W
    Technology
    AVALANCHE
    Terminal Position
    DUAL
    Terminal Form
    C BEND
    Base Part Number
    SM4T
    Pin Count
    2
    Number of Elements
    1
    Element Configuration
    Single
    Power Line Protection
    No
    Max Reverse Leakage Current
    200nA
    Voltage - Clamping (Max) @ Ipp
    39.3V
    Clamping Voltage
    39.3V
    Peak Pulse Current
    59A
    Reverse Standoff Voltage
    18V
    Peak Pulse Power
    400W
    Direction
    Unidirectional
    Test Current
    1mA
    Unidirectional Channels
    1
    Breakdown Voltage
    20V
    Max Breakdown Voltage
    22.2V
    ESD Protection
    Yes
    Height
    2.45mm
    Length
    4.6mm
    Width
    2.9mm
    REACH SVHC
    No SVHC
    RoHS Status
    RoHS Compliant
    SM4T21AY-STMicroelectronics-datasheet-58295064.pdf
    SM4T21AY-STMicroelectronics-datasheet-15983671.pdf
    SM4T21AY-STMicroelectronics-datasheet-10835822.pdf
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