onsemi MM3Z7V5ST1

Overview

MM3Z7V5ST1 from onsemi is a 7.5 V ±2.5% tolerance Zener diode in SOD−323 package, rated for 200 mW steady-state power dissipation, with 15 Ω maximum Zener impedance at 5 mA test current and 1.0 μA reverse leakage at 5.0 V. It provides precision voltage regulation in space-constrained portable electronics such as smartphone power rails and USB interface protection.

For engineers reviewing the MM3Z7V5ST1 datasheet, pinout, applications, or equivalent options, key selection criteria include its tight 7.28–7.60 V Zener voltage range, low 140 pF capacitance at 0 V bias, Class 3 ESD rating (>16 kV HBM), thermal resistance of 635°C/W, and compatibility with Pb-free reflow soldering up to 260°C for 10 seconds.

Technical Context

This Zener diode operates in reverse breakdown mode to clamp or regulate voltage at nominal 7.5 V with temperature coefficient of +2.5 mV/°C at 5 mA. Its low dynamic impedance (15 Ω) ensures stable regulation under varying load currents, while the 140 pF junction capacitance supports high-frequency noise suppression in signal line protection.

The SOD−323 package enables surface-mount integration on high-density PCBs, with cathode polarity marked by a band and mechanical dimensions of 1.70 mm × 1.25 mm × 0.90 mm. Thermal performance is defined by 635°C/W junction-to-ambient resistance and −65°C to +150°C operating temperature range.

Key Specifications

Pinout & Package

SOD−323 surface-mount package with cathode indicated by polarity band; body dimensions: 1.70 mm × 1.25 mm × 0.90 mm; weight: 4.507 mg/unit; mounting position: any; flammability rating: UL 94 V−0.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX384-B7V5,115 and MMSZ5236B-TP, the MM3Z7V5ST1 offers balanced performance: tighter tolerance than MMSZ5236B-TP, smaller footprint than SOD-123 alternatives, and higher ESD rating than many competing 7.5 V Zeners-making it optimal for next-gen portable designs where space, precision, and ruggedness coexist.

Availability

MM3Z7V5ST1 is available at Aetrix Electronics and suitable for smartphone power management, USB interface protection, IoT sensor signal conditioning, and wearable battery monitoring requiring stable component supply and full RoHS compliance.

Supply support for MM3Z7V5ST1 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and edge applications.

The MM3Z7V5ST1 belongs to the MM3ZxxxST1 series of precision Zener regulators designed specifically for space-constrained, high-reliability portable electronics where tight voltage tolerance, low leakage, and high ESD immunity are mandatory.

FAQ

What is the exact Zener voltage range specified for MM3Z7V5ST1 at 5 mA test current?

The MM3Z7V5ST1 has a guaranteed Zener voltage range of 7.28 V to 7.60 V when tested at I_ZT = 5 mA and T_A = 25°C. This ±2.5% tolerance is confirmed in the Electrical Characteristics table on page 2 of the official onsemi datasheet (Rev. 15, September 2008). The MM3Z7V5ST1 achieves this tight specification using process-controlled doping and laser trimming during manufacturing.

Does MM3Z7V5ST1 support Pb-free reflow soldering processes?

Yes, MM3Z7V5ST1 supports Pb-free reflow soldering with a maximum peak temperature of 260°C for 10 seconds, as specified in the Mechanical Characteristics section. The device is offered in both Sn-only and Pb-Sn plated lead finishes, and the "G" suffix (e.g., MM3Z7V5ST1G) explicitly denotes the Pb-free variant. The MM3Z7V5ST1 meets JEDEC J-STD-020 moisture sensitivity level 1 requirements.

What is the maximum reverse leakage current for MM3Z7V5ST1 and at what voltage is it measured?

The maximum reverse leakage current for MM3Z7V5ST1 is 1.0 μA, measured at a reverse voltage (V_R) of 5.0 V and ambient temperature of 25°C. This value is listed in the Electrical Characteristics table under the "I_R @ V_R" column for the MM3Z7V5ST1 row. Low leakage ensures minimal impact on battery life in always-on portable applications using the MM3Z7V5ST1.

How does the temperature coefficient of MM3Z7V5ST1 affect its regulation stability across operating temperature?

The MM3Z7V5ST1 has a temperature coefficient of +2.5 mV/°C at I_ZT = 5 mA, meaning its Zener voltage increases by approximately 2.5 mV per degree Celsius rise in junction temperature. This predictable positive drift allows firmware-based compensation in precision systems. For example, over a −40°C to +85°C ambient range, the MM3Z7V5ST1 exhibits ~313 mV total shift - a known, linear behavior that enhances design repeatability compared to uncharacterized Zeners.

Can MM3Z7V5ST1 be used as a substitute for higher-power Zener diodes like 1N4733A in low-current applications?

Yes, MM3Z7V5ST1 can replace higher-power Zeners such as 1N4733A in low-current applications (<5 mA) where board space is constrained, provided the 200 mW power limit is respected. Unlike the DO-41 packaged 1N4733A (1.0 W), the MM3Z7V5ST1 delivers identical 7.5 V regulation in a 1.7 mm × 1.25 mm SOD−323 footprint. However, the MM3Z7V5ST1 must not be used where sustained >200 mW dissipation is expected - its thermal resistance (635°C/W) requires careful layout derating.