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ESDA18-1K

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STMicroelectronics ESD Protection Devices, SOD-523. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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ESDA18-1K

STMicroelectronics · ESD Protection Devices · SOD-523

ESDA18-1K from STMicroelectronics, in a SOD-523. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 Pin 1 passive One terminal of the single-line unidirectional Transil diode, which for ESDA18-1K has a minimum breakdown voltage of 18 V and a clamping voltage of 34 V at 1 A IPP (8/20 µs), with the anode/cathode assignment not stated in the text.
2 Pin 2 passive The other terminal of the single-line unidirectional Transil diode, which protects the line against ESD and EOS transients and is rated for 30 kV contact discharge at device level, with the anode/cathode assignment not stated in the text.

Key specifications

Parameter Value
Manufacturer STMicroelectronics
Package SOD-523
Category Circuit Protection
Pins 2

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Breakdown voltage VBR 18 19 V @ IR = 1 mA; Tamb = 25 °C 2
Leakage current IRM 0.5 µA @ VRM = 15 V; Tamb = 25 °C 2
Clamping voltage at IPP = 1 A VCL 24 V @ IPP = 1 A (8/20 µs); Tamb = 25 °C 2
Clamping voltage at IPP = 12 A VCL 34 V @ IPP = 12 A (8/20 µs); Tamb = 25 °C 2
Line capacitance Cline 105 pF VR = 0 V, Fosc = 1 MHz, Vosc = 30 mV; Tamb = 25 °C 2
Peak pulse voltage VPP 30 kV IEC 61000-4-2 air discharge and contact discharge; Tamb = 25 °C 2
Operating junction temperature range Tj -40 150 °C 2
Storage temperature range Tstg -65 150 °C 2
Maximum lead temperature for soldering TL 260 °C during 10 s 2
Peak pulse current IPP 12 A 8/20 µs; ESDA18-1K 2
Peak pulse power PPP 400 W 8/20 µs; ESDA18-1K 2

CAD (KiCad official)

  • Symbol: ESDA18-1K
  • Footprint: Diode_SMD:D_SOD-523
  • 3D model: SOD-523 (KiCad packages3D, STEP)
  • 3D model files: esda18-1k-etched.step / esda18-1k-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); esda18-1k.step / esda18-1k.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: STMicroelectronics datasheet (10 pp, sha256 eec627ee82c5eb63, retrieved 2026-10-21, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF