component
MMBZ18VA
Public Made by Adomby adom
JSMSEMI TVS, 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
markdownMMBZ18VA
JSMSEMI · TVS · SOT-23
MMBZ18VA from JSMSEMI, 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 | K1 | passive | Cathode of the first TVS diode, used unidirectionally against pin 3 with VRWM 14.5 V, VBR 17.10 to 18.90 V at 1.0 mA and VC 25 V at IPP 1.6 A. |
| 2 | K2 | passive | Cathode of the second TVS diode, used unidirectionally against pin 3 with VRWM 14.5 V, VBR 17.10 to 18.90 V at 1.0 mA and VC 25 V at IPP 1.6 A. |
| 3 | A | passive | Common anode of both TVS diodes, shared by pins 1 and 2; the datasheet allows either two unidirectional channels (1-3, 2-3) or one bidirectional configuration (1-2). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | JSMSEMI |
| Package | SOT-23 |
| Category | TVS/Fuse/Board Level 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 |
|---|---|---|---|---|---|---|---|
| Peak Power Dissipation (1.0 ms, TA=25°C), MMBZ12VA thru MMBZ33VA group | PPK | 40 | W | @ 1.0 ms, TA=25°C | 1 | ||
| Lead Solder Temperature (max, 10 s) | TL | 260 | °C | 10 s duration | 1 | ||
| Junction and Storage Temperature Range | TJ, TSTG | -55 | 150 | °C | 1 | ||
| Total Power Dissipation on FR-5 Board | PD | 225 | mW | FR-5 board, TA=25°C | 1 | ||
| Derate above 25°C, FR-5 Board | 1.8 | mW/°C | above TA=25°C | 1 | |||
| Thermal Resistance Junction-to-Ambient, FR-5 Board | RθJA | 556 | °C/W | FR-5 board | 1 | ||
| Total Power Dissipation on Alumina Substrate | PD | 300 | mW | Alumina substrate, TA=25°C | 1 | ||
| Derate above 25°C, Alumina Substrate | 2.4 | mW/°C | above TA=25°C | 1 | |||
| Thermal Resistance Junction-to-Ambient, Alumina Substrate | RθJA | 417 | °C/W | Alumina substrate | 1 | ||
| Maximum Reverse Leakage Current | IR | 50 | nA | @ VRWM | 2 | ||
| Working Peak Reverse Voltage | VRWM | 14.5 | V | 2 | |||
| Breakdown Voltage (unidirectional) | VBR | 17.1 | 18 | 18.9 | V | IT = 1.0 mA, TA=25°C | 2 |
| Maximum Temperature Coefficient of VBR | θVBR | 15.3 | mV/°C | 2 | |||
| Forward Voltage | VF | 0.9 | V | IF = 10 mA | 2 | ||
| Clamping Voltage | VC | 25 | V | @ IPP = 1.6 A | 2 |
CAD (KiCad official)
- Symbol:
MMBZ18VA - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: JSMSEMI datasheet (5 pp, sha256
086b405f4e1e2f6a, retrieved 2026-11-04, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-opus-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).