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Generated by kicad-footprint-generator · KiCad file format 20260206

Name	Last commit message	Last updated
docs	Publish 0.1.0 · Ray	17d ago
viewers	mmbz18valt1g: viewers · Ray	17d ago
mmbz18valt1g-etched.glb	Publish 0.1.0 · Ray	17d ago
mmbz18valt1g-etched.step	mmbz18valt1g: factory component page (tier=lcsc) · Ray	17d ago
mmbz18valt1g-hero.glb	mmbz18valt1g: hero GLB from the etched model (keeps the MPN mark) · Ray	17d ago
mmbz18valt1g-hero.overlay.json	Publish 0.1.0 · Ray	17d ago
mmbz18valt1g.glb	Publish 0.1.0 · Ray	17d ago
mmbz18valt1g.kicad_mod	Publish 0.1.0 · Ray	17d ago
mmbz18valt1g.kicad_sym	Publish 0.1.0 · Ray	17d ago
mmbz18valt1g.lbr	Publish 0.1.0 · Ray	17d ago
mmbz18valt1g.step	Publish 0.1.0 · Ray	17d ago
package.json	Publish 0.1.0 · Ray	17d ago
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README.md	Publish 0.1.0 · Ray	17d ago

MMBZ18VALT1G

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

MMBZ18VALT1G 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 1	passive	Cathode of the first Zener junction; with pin 3 (anode) it forms one unidirectional TVS, with a working peak reverse voltage of 14.5 V and a breakdown voltage of 17.10 V to 18.90 V for the MMBZ18VALT1G.
2	CATHODE 2	passive	Cathode of the second Zener junction; with pin 3 (anode) it forms the second unidirectional TVS, with the same MMBZ18VALT1G ratings as pin 1.
3	ANODE	passive	Common anode shared by both Zener junctions, so the package protects two separate lines in one SOT-23 package.

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	17.1	18	18.9	V	@ IT = 1.0 mA, TA = 25°C (Note 4); 40 W 5% table	3
Breakdown voltage tolerance (printed 5% tolerance)	VBR	-5		5	%	40 W, 5% tolerance table	3
Maximum Reverse Leakage Current	IR			50	nA	@ VRWM = 14.5 V	3
Clamping Voltage	VC			25	V	@ IPP = 1.6 A (surge per Figure 6, Note 6)	3
Maximum Reverse Peak Pulse Current	IPP			1.6	A		3
Working Peak Reverse Voltage	VRWM			14.5	V		3
Maximum Temperature Coefficient of VBR				15.3	mV/°C	@ IT = 1.0 mA	3
Forward Voltage	VF			0.9	V	@ IF = 10 mA	3
Peak Power Dissipation	Ppk			40	W	@ 1.0 ms, TL ≤ 25°C, non-repetitive (Note 1); MMBZ12V thru MMBZ47V group	2
Total Power Dissipation on FR-5 Board	PD			225	mW	@ TA = 25°C (Note 2)	2
Total Power Dissipation on Alumina Substrate	PD			300	mW	@ TA = 25°C (Note 3)	2
Thermal Resistance Junction-to-Ambient (FR-5 board)	RθJA			556	°C/W	FR-5 board (Note 2)	2
Thermal Resistance Junction-to-Ambient (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: MMBZ18VALT1G
Footprint: Package_TO_SOT_SMD:SOT-23
3D model: SOT-23 (KiCad packages3D, STEP)
3D model files: mmbz18valt1g-etched.step / mmbz18valt1g-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mmbz18valt1g.step / mmbz18valt1g.glb are the bare package body.

Provenance

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

Datasheet: onsemi datasheet (7 pp, sha256 a000c92c23393615, 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