onsemi MM5Z5V1

Overview

MM5Z5V1 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 5.1 V at 5 mA test current, with ±0.3 V tolerance (4.8–5.4 V), 60 Ω dynamic impedance, and 200 mW power dissipation in the ultra-compact SOD-523F package - commonly used in portable battery management and ESD-clamped I/O line protection.

For engineers reviewing the MM5Z5V1 datasheet, MM5Z5V1 pinout, MM5V1 application, or MM5Z5V1 equivalent, key selection criteria include its tight 5.1 V regulation window, low 2 µA maximum reverse leakage at 2 V, 0.7 mm height constraint, thermal resistance of 500 °C/W, and compliance with RoHS and MSL Level 1 handling requirements.

Technical Context

The MM5Z5V1 operates as a two-terminal shunt regulator, maintaining stable reference voltage by conducting reverse current above its breakdown threshold. Its Zener voltage is specified under 10 ms pulse conditions to minimize self-heating effects, and its impedance is measured using 60 Hz AC superimposed on DC bias - reflecting real-world transient response in power rail clamping.

Designed for operation across –55 °C to +150 °C, the device uses a planar-diffused silicon junction and matte tin (Sn) lead finish. The cathode is marked by a band on the SOD-523F body, and its green mold compound meets JEITA SC79 mechanical standards for automated placement reliability.

Key Specifications

Pinout & Package

Package: SOD-523F - 2-lead, flat-lead, surface-mount plastic package per JEITA SC79; 0.7 mm maximum height; cathode indicated by molded band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MM5Z5V1, BZX584B5V1 offers identical voltage but sacrifices power and impedance performance in a larger package, while MMSZ5231B trades miniaturization for robustness and tighter regulation - making MM5Z5V1 optimal for space- and precision-critical embedded applications.

Availability

MM5Z5V1 is available at Aetrix Electronics and suitable for battery management systems, microcontroller reset networks, ESD-protected communication interfaces, and precision analog reference circuits requiring stable component supply across high-mix, low-volume production runs.

Supply support for MM5Z5V1 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 supplier of energy-efficient semiconductor solutions, specializing in power management, signal conditioning, and discrete devices for automotive, industrial, and consumer markets.

The MM5Z series belongs to ON Semiconductor's precision Zener diode product line, engineered specifically for compact, high-reliability voltage reference and transient suppression in space-constrained, low-power electronic systems.

FAQ

What is the Zener voltage tolerance of the MM5Z5V1?

The MM5Z5V1 has a Zener voltage tolerance of ±0.3 V around its nominal 5.1 V rating, meaning it is guaranteed to operate between 4.8 V and 5.4 V at 5 mA test current (I_ZT). This specification is verified per the Rev. 1.5 datasheet and applies under pulse-test conditions to minimize self-heating effects. The MM5Z5V1's tight tolerance supports accurate threshold detection in reset and monitoring circuits without calibration.

Can the MM5Z5V1 be used in place of a 5 V linear regulator?

No - the MM5Z5V1 is a two-terminal shunt Zener diode, not a three-terminal series regulator. It requires an external current-limiting resistor and cannot source load current like a 78L05. However, the MM5Z5V1 is appropriate for low-current reference or clamping roles - e.g., setting a comparator threshold or protecting an I/O pin - where its 200 mW dissipation and 60 Ω impedance define usable operating boundaries. For active regulation, pair the MM5Z5V1 with a pass transistor or use a dedicated LDO.

What is the maximum reverse leakage current for the MM5Z5V1 at 2 V?

The MM5Z5V1 specifies a maximum reverse leakage current (I_R) of 2 µA at 2 V reverse voltage (V_R), per the Electrical Characteristics table in the official datasheet. This low leakage ensures minimal standby current draw in always-on applications such as real-time clocks or sensor wake-up circuits. The value is measured at T_A = 25 °C and remains below 5 µA across the full –55 °C to +150 °C operating range, confirming the MM5Z5V1's suitability for battery-critical designs.

Is the MM5Z5V1 compatible with lead-free reflow processes?

Yes - the MM5Z5V1 features a matte tin (Sn) lead finish and is Pb-free and RoHS compliant, fully qualified for standard lead-free reflow profiles including JEDEC J-STD-020. Its MSL Level 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, and the MM5Z5V1's thermal resistance (500 °C/W) must be considered when designing PCB copper land patterns to avoid exceeding its 200 mW power limit during sustained operation.

How does the MM5Z5V1's Zener impedance affect its performance in a voltage reference circuit?

The MM5Z5V1's Zener impedance (Z_ZT) is specified at ≤60 Ω at 5 mA, directly impacting how much its output voltage varies with changes in current. In a reference circuit, this means a 1 mA change in Zener current causes ≤60 mV shift in V_Z, limiting regulation accuracy under dynamic load conditions. To minimize this effect, the MM5Z5V1 should be biased with a stable current source or a sufficiently large series resistor - especially important in precision ADC reference or comparator threshold applications where the MM5Z5V1's low 60 Ω impedance provides better stability than higher-Z alternatives like the MMSZ5231B (17 Ω) or BZX584B5V1 (90 Ω).