onsemi MM3Z9V1T1

Overview

MM3Z9V1T1 from onsemi is a 9.1 V ±5% Zener diode in SOD−323 package, rated for 200 mW steady-state power dissipation at 25°C, with 15 Ω maximum Zener impedance at 5 mA test current and 0.2 µA reverse leakage at 7.0 V. It provides precision voltage regulation in space-constrained portable electronics.

For engineers reviewing the MM3Z9V1T1 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), low-profile SOD−323 footprint (1.7 mm × 1.25 mm × 0.9 mm), ESD robustness (>16 kV HBM), thermal resistance (635°C/W), and Pb-free compliance.

Technical Context

This device operates as a two-terminal voltage reference using avalanche breakdown in silicon PN junction. Its Zener voltage is specified at 5 mA test current (IZT) with temperature coefficient of +3.8 mV/°C, enabling stable regulation across −65°C to +150°C junction range.

The SOD−323 package features cathode-indicated polarity band, Pb−Sn or Sn-only plating, UL 94 V−0 flammability rating, and 260°C soldering tolerance for 10 seconds. Thermal derating is 1.5 mW/°C above 25°C ambient.

Key Specifications

Pinout & Package

SOD−323 surface-mount package: 1.7 mm × 1.25 mm body, 0.9 mm height, cathode marked by band. Terminals are unidirectional: Pin 1 = Cathode, Pin 2 = Anode.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MM3Z9V1T1, BZX384-B9V1 offers higher pulse power handling but looser Zener impedance, while MMSZ9V1T1G trades minimal size for easier assembly and lower dynamic impedance-choice depends on whether board area or thermal robustness dominates the design constraint.

Availability

MM3Z9V1T1 is available at Aetrix Electronics and suitable for smartphone power rail clamping, USB-C port overvoltage protection, and IoT sensor node reference applications requiring stable component supply across multi-year production cycles.

Supply support for MM3Z9V1T1 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 edge applications.

The MM3Z series is part of onsemi's precision Zener regulator portfolio, engineered for ultra-compact voltage reference and clamping in portable and high-density PCB designs where space and reliability are critical.

FAQ

What is the Zener voltage tolerance for MM3Z9V1T1?

The MM3Z9V1T1 has a Zener voltage tolerance of ±5%, with minimum 8.5 V and maximum 9.6 V at 5 mA test current (IZT). This tolerance is guaranteed across the full operating temperature range of −65°C to +150°C, making MM3Z9V1T1 suitable for applications requiring consistent voltage clamping without calibration.

Can MM3Z9V1T1 replace MM3Z8V2T1 in a 9 V rail design?

No-MM3Z9V1T1 is not a direct replacement for MM3Z8V2T1 because its nominal Zener voltage is 9.1 V versus 8.2 V, resulting in a 0.9 V higher clamping level. Using MM3Z9V1T1 in place of MM3Z8V2T1 would raise the regulated rail by nearly 11%, potentially exceeding downstream IC absolute maximum ratings. Always verify voltage margins before substitution.

What is the maximum reverse leakage current for MM3Z9V1T1 at 7.0 V?

The maximum reverse leakage current for MM3Z9V1T1 is 0.2 µA at VR = 7.0 V and TA = 25°C. This low leakage supports ultra-low-power applications such as battery-backed real-time clocks or always-on sensor wake-up circuits where standby current must remain below 1 µA.

Is MM3Z9V1T1 compatible with lead-free reflow soldering processes?

Yes-MM3Z9V1T1 is offered in a Pb-free version (denoted by the "G" suffix), with Sn-only terminal plating qualified for standard lead-free reflow profiles up to 260°C for 10 seconds. The SOD−323 package meets JEDEC J-STD-020 moisture sensitivity level 1, eliminating bake requirements prior to assembly.

How does the temperature coefficient affect MM3Z9V1T1 in automotive applications?

The MM3Z9V1T1 has a positive temperature coefficient of +3.8 mV/°C, meaning its Zener voltage increases linearly with junction temperature. In automotive under-hood applications where ambient reaches +105°C, this results in ~300 mV rise over 25°C baseline-designers must account for this drift when setting overvoltage thresholds in BCM or ADAS subsystems using MM3Z9V1T1.