onsemi MM3Z27VC

Overview

MM3Z27VC from onsemi is a 27 V, ±5% tolerance Zener diode in SOD−323FL package, rated for 200 mW power dissipation, with 75 Ω zener impedance at 2 mA test current and 0.045 µA reverse leakage at 18.9 V, used for precision voltage regulation and reference in low-power analog circuits.

For engineers reviewing the MM3Z27VC datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage accuracy, low leakage at rated VR, thermal resistance (595 °C/W), and compatibility with high-density SMD layouts requiring thin-profile discrete protection or biasing elements.

Technical Context

This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to maintain stable 27 V across its terminals when biased above VZ with controlled current. It exhibits 75 Ω dynamic impedance at IZT = 2 mA and 282 Ω at knee current IZK = 0.5 mA, enabling predictable regulation in low-current feedback paths.

Designed for surface-mount use on standard PCBs with minimum land pads, the MM3Z27VC features matte tin finish, Pb-free construction, RoHS compliance, and a maximum junction temperature of 150 °C - supporting reliable operation in compact consumer and industrial signal-conditioning modules.

Key Specifications

Pinout & Package

SOD−323FL is a 2-pin surface-mount package with cathode marking band. Anode (Pin 1) and cathode (Pin 2) are arranged linearly along the long axis; polarity is identified by a visible cathode stripe on the top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX384-B27 and MMSZ4687, the MM3Z27VC offers the thinnest profile and lowest leakage among 27 V Zeners in this class, making it optimal for ultra-compact, low-quiescent systems where thermal margin is managed via layout rather than package size.

Availability

MM3Z27VC is available at Aetrix Electronics and suitable for portable sensor biasing, ADC reference divider networks, USB-C power negotiation clamping, and industrial PLC input protection requiring stable component supply and consistent parametric performance across production lots.

Supply support for MM3Z27VC 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.

The MM3Z27VC belongs to the MM3ZxVC Zener diode family, engineered for high-accuracy voltage regulation in space-constrained, low-power analog subsystems - emphasizing tight tolerance, low leakage, and robust SMD manufacturability.

FAQ

What is the zener voltage tolerance of MM3Z27VC?

The MM3Z27VC has a nominal zener voltage of 27 V with a guaranteed tolerance of ±5%, meaning its actual breakdown voltage falls between 25.65 V and 28.35 V when tested at IZT = 2 mA under standard conditions. This tolerance is specified per the C-series designation in onsemi's ordering nomenclature and is verified during production testing.

What is the maximum power dissipation for MM3Z27VC?

The MM3Z27VC is rated for a maximum power dissipation of 200 mW at TA = 25 °C when mounted on a PCB with minimum land pad. Derating is required above 25 °C ambient, following the 595 °C/W thermal resistance value - for example, maximum allowable PD drops to ~150 mW at 75 °C ambient.

Does MM3Z27VC have a specified forward voltage?

Yes, the MM3Z27VC has a maximum forward voltage (VF) of 1.0 V at IF = 10 mA, as stated in the Absolute Maximum Ratings table. This parameter applies when the device is operated in forward conduction mode - though its primary function is reverse-bias regulation, not rectification.

What is the reverse leakage current of MM3Z27VC at 18.9 V?

The MM3Z27VC exhibits a maximum reverse leakage current (IR) of 0.045 µA when subjected to VR = 18.9 V at TA = 25 °C. This ultra-low leakage supports high-impedance reference applications such as precision voltage dividers feeding ADC inputs or op-amp bias networks.

Which package does MM3Z27VC use, and what are its dimensions?

The MM3Z27VC uses the SOD−323FL package (Case 477AB), measuring 1.7 mm × 1.25 mm × 0.95 mm (L × W × H). Its distinguishing feature is reduced thickness versus standard SOD-323, enabling use in ultra-thin assemblies like wearable sensors and slim power adapters.