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STMicroelectronics SM4T18AY

TVS DIODE 15VWM 32.5VC SMA

Answer first: this page is a purchasing reference for the exact part number SM4T18AY from STMicroelectronics. Use it to start datasheet, package, manufacturer and RFQ verification; do not treat page text as a live stock, price or lead-time promise.

Manufacturer: STMicroelectronics Category: TVS Diodes Part number: SM4T18AY Package: DO-214AC, SMA RFQ verification required

Key Parameters

Part NumberSM4T18AY
ManufacturerSTMicroelectronics
CategoryTVS Diodes
packageDO-214AC, SMA
seriesSM4TY, TRANSIL™
packagingTape & Reel (TR)
product statusActive
param 1Zener
param 21
param 3-
param 415V
param 516.7V
param 632.5V
param 771A (8/20µs)
param 8400W
param 9No
param 10-
param 11-
param 12-55°C ~ 150°C (TJ)
param 13Automotive
param 14AEC-Q101
param 15Surface Mount
param 16DO-214AC (SMA)

Parameters are provided for purchasing review. Confirm package, suffix, lifecycle status, datasheet revision and approved substitutes before ordering.

How to Verify SM4T18AY Before Ordering

Datasheet and parameter checks

  • Confirm the full manufacturer part number, not only a shortened search keyword.
  • Compare package, pinout, dimensions, voltage or rating fields, temperature range and compliance wording against the released BOM.
  • Use the manufacturer datasheet or drawing for electrical and mechanical limits before approving a substitute.

RFQ fields SENICO needs

  • Send exact part number, manufacturer, quantity, target delivery date, destination and required packaging.
  • State whether alternates are allowed, and list any date-code, certificate, traceability or customer AVL requirement.
  • Keep exact stock, factory lead time and proposed alternatives in separate quote lanes.

For SM4T18AY, SENICO recommends checking manufacturer marking, package, date code, requested quantity, approved vendor requirements and replacement risk before issuing a purchase order. If a supplier suggests an equivalent, record the changed fields and approval owner before comparing price.

We do not treat displayed data as a real-time stock or price commitment. The RFQ reply is the verified commercial reference.

Related buying guides: stock and lead-time verification, equivalent IC comparison, and BOM RFQ preparation.