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Contents

Pinout
Key specifications
Electrical characteristics
CAD (KiCad official)
Provenance

README

markdown

SM15T1G

onsemi · ESD And Surge Protection (TVS/ESD) · SOT-23

SM15T1G from onsemi, in a SOT-23. 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	CATHODE	passive	Cathode of one of the two common-anode junctions; used with pin 3 for a unidirectional configuration for SM15T1G, which has a working peak reverse voltage (VRWM) of 15 V and a breakdown voltage of 16.7 V minimum at 1.0 mA.
2	CATHODE	passive	Cathode of the second common-anode junction; used with pin 3 for a second unidirectional configuration, or with pin 1 for a single bidirectional configuration, per the datasheet's Specification Features.
3	ANODE	passive	Common anode shared by both junctions; the datasheet's unidirectional circuits are tied to pins 1 and 3 or 2 and 3, and the SM15T1G pin 1 to pin 3 typical capacitance is 100 pF at 0 V.

Key specifications

Parameter	Value
Manufacturer	onsemi
Package	SOT-23
Category	Circuit Protection
Pins	3

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), min	VBR	16.7			V	@ IT = 1.0 mA	2
Breakdown Voltage (VBR), max	VBR			19.6	V	@ IT = 1.0 mA	2
Maximum Reverse Leakage Current (IR)	IR			1	µA	@ VRWM	2
Maximum Reverse Peak Pulse Current (IPP)	IPP			10	A	8/20 s pulse waveform per Figure 3 (Note 4)	2
Clamping Voltage (VC)	VC		24		V	@ IPP = 1 Amp	2
Working Peak Reverse Voltage (VRWM)	VRWM		15		V		2
Peak Power Dissipation	Ppk			300	W	@ 20 s (Note 1), TL ≤ 25°C	2
IEC 61000-4-2 (ESD) Air		-15		15	kV	IEC 61000-4-2 (ESD), Air discharge; printed ±15 kV	2
IEC 61000-4-2 (ESD) Contact		-26		26	kV	IEC 61000-4-2 (ESD), Contact discharge; printed ±26 kV	2
IEC 61000-4-4 (EFT)				40	A	IEC 61000-4-4 (EFT)	2
IEC 61000-4-5 (Lightning)				12	A	IEC 61000-4-5 (Lightning)	2
Total Power Dissipation on FR-5 Board	PD			225	mW	@ TA = 25°C (Note 2), FR-5 board	2
Thermal Resistance, Junction-to-Ambient on FR-5 Board	RθJA			556	°C/W	FR-5 board (Note 2)	2
Total Power Dissipation on Alumina Substrate	PD			300	mW	@ TA = 25°C (Note 3), alumina substrate	2
Thermal Resistance, Junction-to-Ambient on Alumina Substrate	RθJA			417	°C/W	Alumina substrate (Note 3)	2
Junction and Storage Temperature Range	TJ, Tstg	-55		150	°C		2
Lead Solder Temperature (Maximum)	TL			260	°C	10 second duration	2

CAD (KiCad official)

Symbol: SM15T1G
Footprint: Package_TO_SOT_SMD:SOT-23
3D model: SOT-23 (KiCad packages3D, STEP)
3D model files: sm15t1g-etched.step / sm15t1g-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sm15t1g.step / sm15t1g.glb are the bare package body.

Provenance

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

Datasheet: onsemi datasheet (6 pp, sha256 8e7fda85cfb0bd8f, retrieved 2026-10-18, tier: lcsc)
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