onsemi MM3Z6V8ST1

Overview

MM3Z6V8ST1 from onsemi is a 200 mW, 6.65–6.93 V Zener voltage regulator diode in SOD−323 package, designed for precision voltage reference and overvoltage protection in space-constrained circuits. It features ±5% tolerance at 5 mA test current, 15 Ω dynamic impedance, 4.0 μA leakage at 5.46 V, and ESD rating >16 kV (HBM).

For engineers reviewing the MM3Z6V8ST1 datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage, power dissipation limit, dynamic impedance at IZT, temperature coefficient, and SOD−323 footprint compatibility with high-density PCB layouts.

Technical Context

This Zener diode operates in reverse breakdown to maintain stable voltage regulation across load and line variations. Its 200 mW steady-state power rating and 635°C/W junction-to-ambient thermal resistance define its safe operating area under ambient conditions up to +150°C.

The device exhibits a positive temperature coefficient of +1.2 mV/°C at 5 mA, low capacitance (155 pF at 0 V, 1 MHz), and tight VZ tolerance enabled by process-controlled doping-making it suitable for biasing, voltage clamping, and reference generation where stability and repeatability are critical.

Key Specifications

Pinout & Package

SOD−323 surface-mount package with cathode indicated by polarity band; body dimensions 1.7 mm × 1.25 mm × 0.9 mm; weight 4.507 mg/unit; mounting position unrestricted.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX384-B6V8,115 and MMSZ4688T1G, the MM3Z6V8ST1 offers the smallest footprint and lowest profile among 6.8 V Zeners while maintaining sufficient regulation accuracy and ESD robustness for portable electronics - making it optimal where PCB real estate and component height are primary constraints.

Availability

MM3Z6V8ST1 is available at Aetrix Electronics and suitable for smartphone power management, USB-C port protection, and industrial sensor signal conditioning requiring stable component supply and long-term manufacturability.

Supply support for MM3Z6V8ST1 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 IoT applications.

The MM3ZxxxST1 series targets compact, high-reliability voltage regulation in portable and space-constrained systems - emphasizing tight tolerance, low profile, and high ESD immunity for next-generation consumer and medical wearables.

FAQ

What is the Zener voltage tolerance of MM3Z6V8ST1 at 5 mA test current?

The MM3Z6V8ST1 has a Zener voltage range of 6.65 V to 6.93 V at I_ZT = 5 mA, corresponding to ±5% tolerance around the nominal 6.8 V rating. This tolerance is guaranteed per the Electrical Characteristics table in the official onsemi datasheet Rev. 15, and applies directly to the MM3Z6V8ST1 part number under standard test conditions (T_A = 25°C).

Can MM3Z6V8ST1 be used as a voltage reference in precision analog circuits?

Yes, the MM3Z6V8ST1 is suitable as a moderate-precision voltage reference due to its ±5% V_Z tolerance, +1.2 mV/°C temperature coefficient, and 155 pF capacitance. While not metrology-grade, it delivers stable 6.8 V regulation for non-critical biasing, ADC references, and comparator thresholds in cost-sensitive portable designs where the MM3Z6V8ST1's SOD−323 footprint and ESD robustness add system-level value.

What is the maximum power dissipation of MM3Z6V8ST1 and how does it derate with temperature?

The MM3Z6V8ST1 has a maximum steady-state power dissipation of 200 mW at T_A = 25°C, derating linearly at 1.5 mW/°C above that temperature. Its thermal resistance is 635°C/W, meaning junction temperature rise is predictable under known ambient and power conditions - critical for reliability validation in sealed or thermally isolated enclosures using the MM3Z6V8ST1.

Does MM3Z6V8ST1 have Pb-free packaging options?

Yes, the Pb-free version is designated MM3Z6V8ST1G and shares identical electrical specifications and SOD−323 mechanical form factor. The "G" suffix confirms RoHS compliance with Sn-only plating, and both MM3Z6V8ST1 and MM3Z6V8ST1G are supplied in 3000-unit tape-and-reel packaging - enabling drop-in substitution in lead-free manufacturing lines without redesign.

How is polarity marked on the MM3Z6V8ST1 SOD−323 package?

The MM3Z6V8ST1 uses a cathode band to indicate polarity: Pin 1 (cathode) is marked with a visible band on the top surface of the SOD−323 case, while Pin 2 (anode) is unmarked. This marking aligns with JEDEC-standard SOD−323 orientation and must be verified during automated optical inspection (AOI) to prevent reverse-bias installation errors in production using the MM3Z6V8ST1.