onsemi MM5Z15V

Overview

MM5Z15V from ON Semiconductor (formerly Fairchild) is a surface-mount Zener diode designed for precision voltage regulation and overvoltage protection in low-power circuits. It delivers a nominal Zener voltage of 15 V at 5 mA test current, with ±5% tolerance (14.3–15.8 V), 30 Ω dynamic impedance at I_ZT, and 200 mW power dissipation in the ultra-compact SOD-523F package - commonly used in portable battery management and voltage reference circuits.

For engineers reviewing the MM5Z15V datasheet, pinout, applications, or equivalent options, key selection considerations include its 15 V regulation accuracy, low leakage current (≤0.05 µA at 10.5 V), thermal stability across –55°C to +150°C, and compatibility with automated SMT assembly due to its flat-lead, green-molded SOD-523F footprint.

Technical Context

The MM5Z15V operates as a two-terminal voltage reference device relying on reverse-biased Zener breakdown. Its regulation performance is specified under pulse-test conditions (10 ms) to minimize self-heating effects, and its Zener impedance (Z_ZT) is measured using AC superposition at 10% of I_ZT, ensuring stable DC output under small-signal load variations.

It features a cathode-indicating band, matte tin (Sn) lead finish, and meets Moisture Sensitivity Level 1 (MSL-1) requirements - enabling unlimited floor life and reflow compatibility without baking. The device is Pb-free and RoHS compliant, with no halogenated flame retardants in the green mold compound.

Key Specifications

Pinout & Package

SOD-523F is a 2-lead, flat-lead, surface-mount plastic package with cathode indicated by a visible band. Total height is under 0.70 mm, optimized for thin-profile portable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX584-C15 and 1N5245B, the MM5Z15V provides the best balance of ultra-small size, low leakage, and process compatibility for high-volume consumer electronics - while avoiding unnecessary power overhead or legacy packaging trade-offs.

Availability

MM5Z15V is available at Aetrix Electronics and suitable for battery management systems, portable sensor modules, and USB interface protection requiring stable component supply, consistent parametric performance, and full RoHS/REACH compliance.

Supply support for MM5Z15V 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

ON Semiconductor (formerly Fairchild Semiconductor) is a global leader in intelligent power and sensing technologies, serving automotive, industrial, cloud power, and IoT markets with energy-efficient semiconductor solutions.

The MM5Z series belongs to ON Semiconductor's precision Zener diode product line, engineered specifically for compact, high-reliability voltage regulation in space- and power-constrained applications - emphasizing low leakage, tight tolerance, and robust thermal performance.

FAQ

What is the Zener voltage tolerance of MM5Z15V?

The MM5Z15V has a Zener voltage tolerance of ±5% around its nominal 15 V rating, meaning the actual V_Z falls between 14.3 V and 15.8 V when tested at I_ZT = 5 mA. This tolerance is guaranteed per the MM5Z2V4–MM5Z75V datasheet Rev. 1.5 and applies to all units shipped under standard quality screening. The MM5Z15V achieves this consistency using tightly controlled silicon processing and on-wafer Zener voltage trimming.

Can MM5Z15V be used in place of a 1N4744A?

No - the MM5Z15V is not a direct replacement for the 1N4744A. While both regulate at ~15 V, the 1N4744A is a 1 W, DO-41 through-hole device with higher power handling and different Zener impedance (15 Ω typical). The MM5Z15V is a 200 mW, SOD-523F surface-mount part optimized for miniaturized designs. Substituting MM5Z15V for 1N4744A requires verifying thermal derating, PCB layout changes, and load-current capability - the MM5Z15V should only replace 1N4744A in low-power, space-constrained applications where its 200 mW rating suffices.

What is the maximum reverse leakage current for MM5Z15V?

The maximum reverse leakage current (I_R) for MM5Z15V is 0.05 µA at V_R = 10.5 V, as specified in the Electrical Characteristics table. This ultra-low leakage is confirmed under standard test conditions (T_A = 25°C) and supports long battery life in always-on applications. The MM5Z15V maintains this performance across its full operating temperature range, with leakage increasing predictably to ≤1 µA at +125°C per manufacturer characterization data.

Is MM5Z15V compatible with lead-free reflow soldering?

Yes - the MM5Z15V features a matte tin (Sn) lead finish and is fully compatible with standard lead-free reflow profiles (e.g., JEDEC J-STD-020 Class 1). Its MSL-1 rating means it can be stored indefinitely at ambient conditions without baking prior to assembly. The SOD-523F package withstands peak reflow temperatures up to 260°C for 30 seconds, making the MM5Z15V suitable for high-yield, automated SMT production lines without special handling.

Does MM5Z15V require a series current-limiting resistor in operation?

Yes - like all Zener diodes, the MM5Z15V requires an external series current-limiting resistor to establish the correct bias current (I_Z) and prevent thermal runaway. For stable 15 V regulation at 5 mA, a resistor value is calculated using (V_IN − 15 V)/5 mA. The MM5Z15V's 200 mW power rating sets the upper limit for allowable I_Z × V_Z; exceeding this risks permanent degradation. Designers must also consider the resistor's own power rating and temperature coefficient when selecting components for the MM5Z15V bias network.