onsemi MM3Z24VT1

Overview

MM3Z24VT1 from onsemi is a 24.2 V nominal Zener voltage regulator diode in SOD−323 package, rated for 200 mW steady-state power dissipation at 25°C, with 70 Ω maximum dynamic impedance at 5 mA test current and 0.05 µA reverse leakage at 16.8 V. It provides precision voltage reference and overvoltage protection in space-constrained portable electronics.

For engineers reviewing the MM3Z24VT1 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5.2% at 24.2 V), low-profile 1.7 mm × 1.25 mm footprint, Class 3 ESD rating (>16 kV HBM), thermal resistance of 635°C/W, and Pb-free SOD−323 packaging compatible with reflow soldering up to 260°C for 10 seconds.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load and input conditions. Its design centers on low-capacitance (80 pF at 0 V, 1 MHz) and tight voltage regulation for signal-level referencing rather than power regulation.

The device exhibits a positive temperature coefficient of +18.4 mV/°C for its nominal 24.2 V Zener voltage, enabling predictable drift compensation in temperature-sensitive circuits. It is characterized at 5 mA test current (IZT) with guaranteed 22.8 V minimum and 25.6 V maximum Zener voltage at 25°C ambient.

Key Specifications

Pinout & Package

SOD−323 surface-mount package with cathode indicated by polarity band; body dimensions 1.7 mm × 1.25 mm × 0.9 mm; lead finish Pb−Sn or Sn-only (Pb−free); mounting position unrestricted.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener voltage regulation applications.

Compared with BZX384-B24,115 and MMSZ4687T1G, the MM3Z24VT1 offers tighter thermal resistance (635°C/W vs ≥800°C/W), smaller footprint (1.7 mm × 1.25 mm), and lower capacitance (80 pF), making it optimal for high-frequency, space-constrained applications where precise 24.2 V regulation is prioritized over raw power handling.

Availability

MM3Z24VT1 is available at Aetrix Electronics and suitable for cellular phone power management, USB port overvoltage protection, and industrial sensor signal conditioning requiring stable component supply across production volumes.

Supply support for MM3Z24VT1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and IoT applications.

The MM3Z2V4T1 series was designed specifically for miniaturized voltage regulation in portable and high-density electronics, emphasizing low profile, high ESD resilience, and tight Zener voltage control across the 2.4–75 V range.

FAQ

What is the nominal Zener voltage of the MM3Z24VT1 and how is it tested?

The MM3Z24VT1 has a nominal Zener voltage of 24.2 V, measured at a DC test current (I_ZT) of 5 mA and ambient temperature of 25°C. This value falls within the guaranteed 22.8 V to 25.6 V range specified in the Electrical Characteristics table. The measurement uses a pulse test method to minimize self-heating effects, ensuring accuracy for reference-grade applications. The MM3Z24VT1's voltage tolerance and temperature coefficient (+18.4 mV/°C) are fully characterized per onsemi's Rev. 7 datasheet.

Does the MM3Z24VT1 support Pb-free assembly processes?

Yes, the MM3Z24VT1 is offered in a Pb-free package (indicated by the "G" suffix), with Sn-only lead finish compliant with RoHS Directive 2011/65/EU. It supports standard reflow soldering profiles with peak temperature up to 260°C for 10 seconds, matching IPC/JEDEC J-STD-020 requirements. The MM3Z24VT1's SOD−323 package is qualified for both Pb−Sn and Sn-only soldering, and its void-free molded plastic case ensures reliability under thermal cycling stress.

What is the maximum reverse leakage current for the MM3Z24VT1 and at what voltage is it specified?

The MM3Z24VT1 specifies a maximum reverse leakage current (I_R) of 0.05 µA at a reverse voltage (V_R) of 16.8 V, measured at 25°C ambient. This low leakage ensures minimal parasitic current draw in battery-powered systems and preserves accuracy in high-impedance reference circuits. The MM3Z24VT1's leakage remains well below 1 µA even at elevated temperatures, supporting stable operation in industrial environments up to +125°C ambient.

How does the MM3Z24VT1's Zener impedance affect its performance in voltage reference applications?

The MM3Z24VT1 has a maximum Zener impedance (Z_ZT) of 70 Ω at 5 mA test current, directly impacting its ability to maintain stable voltage under dynamic load changes. Lower impedance yields smaller AC voltage deviation-critical for precision references feeding ADCs or comparators. In practice, this 70 Ω value ensures <10 mV ripple suppression for 0.1 mA load transients, making the MM3Z24VT1 suitable for moderate-accuracy analog subsystems where cost and size outweigh ultra-low-noise requirements.

Can the MM3Z24VT1 be used in place of higher-voltage Zener diodes like the MM3Z27VT1 in the same circuit?

No-the MM3Z24VT1 is not interchangeable with the MM3Z27VT1 due to distinct Zener voltage ranges: MM3Z24VT1 is 22.8–25.6 V, while MM3Z27VT1 is 25.1–28.9 V. Substituting them would shift regulation thresholds by ~3 V, potentially causing overvoltage damage or undervoltage shutdown. The MM3Z24VT1's specific 24.2 V nominal point is engineered for compatibility with 24 V system rails and associated protection logic; using a different variant requires full circuit validation including thermal, transient, and tolerance stack-up analysis.