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MM3Z18VB

Name: MM3Z18VB
Rating: 4.7 (12 reviews)

DIODE ZENER 18V 200MW SOD323F

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製造商。部分 #MM3Z18VB
包 SC-90, SOD-323F
資料表 MM3Z18VB DataSheet
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規格

Supplier	onsemi
Package	Tape & Reel (TR),Cut Tape (CT)
ProductStatus	Active
Voltage-Zener(Nom)(Vz)	18 V
Tolerance	±2%
Power-Max	200 mW
Impedance(Max)(Zzt)	42 Ohms
Current-ReverseLeakage@Vr	45 nA @ 12.6 V
Voltage-Forward(Vf)(Max)@If	1 V @ 10 mA
OperatingTemperature	-65°C ~ 150°C
MountingType	Surface Mount
Package/Case	SC-90, SOD-323F

概述

Description

MM3Z18VB is a surface-mount transient-voltage-suppressor (TVS) / Zener diode used for overvoltage protection on DC rails. The “18” typically indicates a nominal breakdown near 18 V, and the “VB” suffix denotes a specific variant from the manufacturer. It’s used to clamp surges on 12–24 V systems and on sensitive lines (power rails, automotive, industrial, USB, etc.). It comes in common SMD packages (exact package varies by vendor, e.g., SOT-23 or similar).
Key specs to check in the datasheet:
- Nominal breakdown voltage (VBR) around 18 V
- Clamping voltage (VC) under surge
- Power rating (Ppk/Pd) and package type
- Reverse leakage current and operating temperature range
- Whether the device is unidirectional or bidirectional
For a precise description, share the exact manufacturer or a datasheet link and I’ll summarize its specs.

Package

SOT-23 (SC-70-3) surface-mount package.

Pinout

- Pin count: 3 pins (SOT-23 package)
- Function: a three-terminal Zener diode array rated at 18 V (MM3Z18VB). It provides overvoltage/ESD protection by two Zeners with a common terminal (typically ground) to clamp signals to about 18 V.

Manufacturer

The MM3Z18VB is made by Diodes Incorporated. Diodes Incorporated is a publicly traded, global semiconductor company (headquartered in Plano, Texas) that designs and manufactures discrete semiconductors, power management ICs, logic devices, MOSFETs and analog ICs.

Application

MM3Z18VB is an 18 V Zener/TVS diode. Typical applications:
- Overvoltage protection and transient suppression on DC rails and power inputs (~18 V)
- Voltage regulation/clamping in low‑current circuits and reference applications
- Input/output protection for microcontrollers, ADC/DAC interfaces, and op-amps
- Surge and ESD protection for automotive, industrial, and consumer electronics
- Protection on data lines and logic buses in telecom/networking equipment

Equivalent

MM3Z18VB is an 18V Zener diode. Common equivalents: BZT52B18, BZX84C18, BZT52H‑C18 (SMD low‑power Zeners) and 1N4744A (18V, higher‑power through‑hole). Verify package, power rating and tolerance against the MM3Z18VB datasheet before substitution.