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MM3Z3V0ST1G

3V Zener diode, 300mW, 5% tolerance, SOD-323

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Manufacturer Part：

MM3Z3V0ST1G

Package：

SOD-323 (1.70 x 1.25 x 0.90 mm)

Brand：

Product Categories：

Integrated Circuits ICs, MOSFETs

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Description

MM3Z3V0ST1G Overview

The MM3Z3V0ST1G is a 500mW Zener voltage regulator diode from onsemi, 3.0V Zener voltage, +/-5% tolerance, in a SOD-323 package, suitable for low-power voltage regulation and voltage reference applications.

Key Features

Zener voltage: 3.0V
Power dissipation: 500mW
Tolerance: +/-5%
Zener impedance: 85 Ohm
Reverse leakage: 3uA
Operating temperature: -65C to 150C

Product Introduction:MM3Z3V0ST1G Product Introduction

The MM3Z3V0ST1G is a 3.0 V, 300 mW Zener voltage regulator diode from onsemi in an ultra-small SOD-323 (SC-76) surface-mount package. It provides a nominal Zener voltage of 3.0 V with plus or minus 5 percent tolerance at a test current of 5 mA. The compact footprint (1.7 x 1.25 x 0.9 mm) and low leakage current of 10 uA at 1 V reverse bias make it ideal for voltage referencing, biasing, and low-power clamping in space-constrained applications. RoHS-compliant and halogen-free.

Working Principle:MM3Z3V0ST1G Working Principle

The MM3Z3V0ST1G operates in the reverse breakdown (Zener) region. When reverse-biased voltage exceeds the Zener knee voltage (approximately 2.90 V), current begins to flow through the depletion region. In this 3 V device, the breakdown mechanism is primarily quantum tunneling (true Zener effect) rather than avalanche multiplication, which dominates at higher voltages. The low dynamic impedance of 100 Ohm at the test current (5 mA) provides reasonable regulation against input voltage and load current variations. The device maintains stable voltage across its operating temperature range with a temperature coefficient of approximately -3.5 mV per degree C, which is characteristic of low-voltage Zener diodes. The glass-passivated junction ensures stable leakage and breakdown characteristics over time.

Pin Description:MM3Z3V0ST1G Pin Definition and Functions

Pin	Name	Description
1	Cathode	Negative terminal when forward biased; connect to positive rail for Zener regulation
2	Anode	Positive terminal when forward biased; connect to ground for Zener regulation

Package: SOD-323 (SC-76), Case 477. The cathode is identified by a bar stripe on the package body. For Zener regulation, the cathode connects to the more positive voltage rail with a series current-limiting resistor.

Application Scenarios:In which products and applications isMM3Z3V0ST1G used

Voltage Reference: Low-cost 3 V reference for comparator thresholds and bias networks
Signal Clamping: Limiting voltage excursions on digital I/O and analog inputs to 3 V
ESD Protection: Secondary ESD clamping for low-voltage signal lines in portable electronics
Bias Stabilization: Maintaining stable gate bias in amplifier circuits powered from varying supplies
Level Shifting: Creating a 3 V offset for single-supply op-amp circuits operating from higher rails

Alternative Models:What chips are recommended as replacements for MM3Z3V0ST1G

Model	Manufacturer	VZ	Power	Tolerance	Package
MM3Z3V0ST1G	onsemi	3.0 V	300 mW	5%	SOD-323
BZX84C3V0	Nexperia	3.0 V	300 mW	5%	SOT-23
MMSZ3V0ST1G	onsemi	3.0 V	300 mW	5%	SOD-123
BZT52C3V0	Diodes Inc	3.0 V	500 mW	5%	SOD-123
1N5227B	Multiple	3.0 V	500 mW	5%	DO-35

MM3Z3V0ST1G is a 3V/300mW Zener diode from onsemi in SOD-323 (SC-76) package with ±5% tolerance. The MM3Z3V0S is the tape-and-reel version without T1G suffix. The SZMM3Z3V0ST1G variant carries AEC-Q101 automotive qualification. For higher power dissipation, MMSZ3V0T1G provides 500mW in SOD-123 package. BZX84C3V0 from NXP/Infineon offers the same 3V Zener voltage in SOT-23-3 package with 300mW dissipation and ±6% tolerance.