component
MMBZ18VALT1G
Public Made by Adomby adom
onsemi ESD And Surge Protection (TVS/ESD), SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
Open in new tab ↗
Loads when you scroll to it. Unloads after 5 minutes in the background.
Symbol & Footprint
Schematic Symbol
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
PCB Footprint
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
Datasheet
Open in new tab ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
README
markdownMMBZ18VALT1G
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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mmbz18valt1g.step/mmbz18valt1g.glbare 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, primaryclaude-haiku-5-5(text), consensusclaude-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).