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MMBZ5230BLT1G

4.7V Zener, 225mW, +/-5%, SOT-23-3, AEC-Q101

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Manufacturer Part：

MMBZ5230BLT1G

Package：

SOT-23-3 (TO-236-3, 2.9 x 1.3 x 1.0 mm)

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Description

Product Overview

The MMBZ5230BLT1G is an onsemi 4.7V Zener diode voltage regulator with 225mW power dissipation, 5% tolerance, 19 ohm impedance, 5uA leakage, and Class 3 ESD rating (>16kV HBM). Packaged in SOT-23-3, -65C to +150C.

Key Specifications

Vz 4.7V nominal
Tolerance +/-5%
Pd 225 mW
Zzt 19 ohm @ 20mA
Ir 5 uA @ 2V
Package SOT-23-3

Features

  • 4.7V Zener voltage, +/-5% tolerance
  • 225mW power dissipation
  • 19 ohm Zener impedance
  • 5uA leakage current at 2V
  • Class 3 ESD rating (>16kV HBM)
  • AEC-Q101 qualified (SZ prefix)
  • Pb-Free, Halogen-Free, RoHS

Applications

  • Voltage regulation and reference
  • ESD protection
  • Level shifting
  • Clamping circuits

The MMBZ5230BLT1G is an onsemi 4.7V Zener diode voltage regulator in a SOT-23-3 surface-mount package. The 4.7V nominal Zener voltage with +/-5% tolerance (4.46V to 4.94V) provides a stable reference or clamping voltage for low-power circuits. The 225mW power dissipation on FR-5 board is suitable for bias and reference applications where current is limited to approximately 47mA. The 19 ohm Zener impedance at 20mA test current indicates moderate regulation. The 5uA leakage current at 2V reverse voltage ensures minimal loading on high-impedance nodes. The Class 3 ESD rating (>16kV HBM) provides robust electrostatic discharge protection. The AEC-Q101 qualified SZ prefix variant (SZMMBZ5230BLT1G) is available for automotive applications. The LT1G suffix indicates 3000-unit tape-and-reel, Pb-free, and RoHS compliance.

The MMBZ5230BLT1G operates in reverse breakdown (Zener/avalanche) mode. When reverse-biased above the 4.7V breakdown voltage, current flows through the diode while the voltage remains approximately constant at Vz. The Zener mechanism (tunneling breakdown) dominates below approximately 5V, while avalanche multiplication contributes above 5V – at 4.7V both mechanisms are active. The 19 ohm dynamic impedance represents the slope of the V-I curve at the 20mA test point. The +/-5% tolerance is the initial voltage spread at 20mA and 25C. The SOT-23-3 pinout has pin 1 as anode, pin 2 as no connect, and pin 3 as cathode. The 225mW power limit is determined by the thermal resistance (556C/W junction-to-ambient on FR-5) and maximum junction temperature of 150C.

Pin Mnemonic Description
1 Anode Positive terminal (GND for regulation)
2 NC No connect
3 Cathode Negative terminal (Vz for regulation)
  • 4.7V bias voltage reference for CMOS logic gate supply clamping
  • ESD protection on I/O lines with >16kV HBM rating
  • Voltage level shifting from 5V to 3.3V domains using 4.7V clamp
  • General-purpose overvoltage clamping for low-power circuits
Model Manufacturer Key Difference
MMBZ5229BLT1G onsemi 4.3V Zener
MMBZ5231BLT1G onsemi 5.1V Zener
BZX84C4V7 Nexperia Equivalent 4.7V Zener
MMSZ4V7T1G onsemi 4.7V, 500mW, SOD-123
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