onsemi MM3Z2V7T1

Overview

MM3Z2V7T1 from onsemi is a 2.7 V nominal Zener diode in SOD−323 package, rated for 200 mW steady-state power dissipation at 25°C, with ±0.2 V tolerance (2.5–2.9 V), 100 Ω maximum dynamic impedance at 5 mA test current, and 20 µA maximum leakage at 1.0 V reverse bias. It provides precision low-voltage regulation in space-constrained portable electronics.

For engineers reviewing the MM3Z2V7T1 datasheet, pinout, applications, or equivalent options, key selection criteria include its 2.7 V Zener voltage tolerance, 100 Ω Zener impedance at IZT = 5 mA, ESD rating >16 kV (HBM), SOD−323 footprint compatibility, and −65°C to +150°C operating temperature range.

Technical Context

This device operates as a two-terminal voltage reference by exploiting controlled reverse breakdown in a silicon p-n junction. Its Zener voltage is specified at 5 mA test current with tight 2.5–2.9 V min/max bounds and a temperature coefficient of −3.5 mV/°C, enabling stable low-voltage clamping in bias networks and overvoltage protection circuits.

The SOD−323 package delivers minimal board area (1.7 mm × 1.25 mm) and height (0.9 mm), with Pb-free plating and UL 94 V−0 flammability rating. Thermal resistance is 635°C/W, requiring derating to 1.5 mW/°C above 25°C ambient for safe 200 mW operation on FR-5 board.

Key Specifications

Pinout & Package

SOD−323 surface-mount package: 1.7 mm × 1.25 mm body, 0.9 mm height, cathode marked by band; polarity critical for correct Zener operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MM3Z2V7T1, BZX384-B2V7 offers higher surge power but greater leakage, while MMBZ5221BS delivers tighter temperature stability and lower leakage in a slightly taller package-both require validation of thermal layout and ESD performance in final system context.

Availability

MM3Z2V7T1 is available at Aetrix Electronics and suitable for smartphone power management, wearable sensor biasing, high-density PC board protection, and USB-C port overvoltage clamp applications requiring stable component supply across production lifecycles.

Supply support for MM3Z2V7T1 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 focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and intelligent edge applications.

The MM3Z series is part of onsemi's precision Zener voltage regulator product line, engineered specifically for compact, low-power voltage reference and overvoltage protection in portable and space-constrained electronic systems.

FAQ

What is the Zener voltage tolerance of MM3Z2V7T1?

The MM3Z2V7T1 has a guaranteed Zener voltage range of 2.5 V to 2.9 V at I_ZT = 5 mA and T_A = 25°C, corresponding to a nominal 2.7 V with ±0.2 V absolute tolerance. This tight spread ensures predictable clamping behavior in low-voltage bias networks without calibration. The MM3Z2V7T1 datasheet specifies this range explicitly in the Electrical Characteristics table.

Does MM3Z2V7T1 support Pb-free soldering processes?

Yes, MM3Z2V7T1 is offered in a Pb-free package (denoted by the "G" suffix), with Sn-only lead plating compatible with standard reflow profiles up to 260°C for 10 seconds. The device meets JEDEC J-STD-020 moisture sensitivity level 1 and carries UL 94 V−0 flammability rating. This makes MM3Z2V7T1 suitable for RoHS-compliant manufacturing lines.

What is the maximum allowable junction temperature for MM3Z2V7T1?

The MM3Z2V7T1 has a junction and storage temperature range of −65°C to +150°C. Its thermal resistance is 635°C/W, so at 200 mW dissipation and 25°C ambient, junction temperature rises to approximately 153.75°C - exceeding the 150°C limit. Therefore, derating is mandatory: power must be reduced linearly above 25°C at 1.5 mW/°C to keep T_J ≤ 150°C. This constraint is critical for sustained operation in enclosed enclosures.

How does the ESD rating of MM3Z2V7T1 compare to typical consumer-grade Zeners?

MM3Z2V7T1 achieves Class 3 Human Body Model (HBM) ESD rating (>16 kV), significantly exceeding the industry-standard Class 2 (≥4 kV) for most general-purpose Zeners. This high immunity supports direct handling in final assembly of handheld devices and reduces risk of latent damage during board-level testing. The robustness stems from optimized junction design and passivation, confirmed in onsemi's qualification testing per ANSI/ESDA/JEDEC JS-001.

Can MM3Z2V7T1 be used as a substitute for MM3Z2V4T1 in a circuit?

No - MM3Z2V7T1 and MM3Z2V4T1 have non-overlapping Zener voltage ranges: MM3Z2V4T1 is 2.2–2.6 V, while MM3Z2V7T1 is 2.5–2.9 V. Their 2.7 V nominal value falls outside MM3Z2V4T1's max 2.6 V, risking insufficient clamping or unintended forward conduction. Substitution requires full circuit analysis including load current, source impedance, and temperature drift. The MM3Z2V7T1 must be selected only where 2.7 V regulation is explicitly required.