onsemi MM3Z15VT1

Overview

MM3Z15VT1 from onsemi is a 15 V, 200 mW surface-mount Zener diode in SOD−323 package, designed for precision voltage regulation and overvoltage protection in space-constrained circuits. It delivers nominal Zener voltage of 15.0 V at 5 mA test current, with dynamic impedance of 30 Ω, leakage current ≤0.05 µA at 10.5 V, and ±0.7 V tolerance across the 14.3–15.8 V range. It is used in voltage reference and clamping functions in portable power rails.

For engineers reviewing the MM3Z15VT1 datasheet, pinout, applications, or equivalent options, key selection criteria include its 15 V regulation accuracy, low 30 Ω Zener impedance at 5 mA, Class 3 ESD rating (>16 kV HBM), 0.9 mm body height, and Pb-free SOD−323 footprint compatibility with high-density PCB layouts.

Technical Context

The MM3Z15VT1 operates as a two-terminal, cathode-anode polarized voltage reference device with reverse-biased Zener breakdown behavior. Its regulation stability relies on controlled avalanche conduction above 14.3 V, supported by a thermal resistance of 635 °C/W and junction temperature range of −65 to +150 °C.

It exhibits a positive temperature coefficient of +9.2 mV/°C and typical capacitance of 110 pF at 0 V bias and 1 MHz, making it suitable for low-frequency stabilization rather than RF bypassing. The device is rated for 200 mW steady-state dissipation on FR-5 board at 25 °C, derating linearly by 1.5 mW/°C above that ambient.

Key Specifications

Pinout & Package

SOD−323 package: 2-pin surface-mount plastic case with cathode indicated by polarity band; total weight 4.507 mg; UL 94 V−0 flammability rating; mountable in any orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX384-B15 and MMSZ5245B-TP, the MM3Z15VT1 offers optimal balance of ultra-compact size, low leakage, and sufficient 200 mW regulation capability for space- and power-sensitive portable electronics - without requiring PCB redesign or sacrificing ESD robustness.

Availability

MM3Z15VT1 is available at Aetrix Electronics and suitable for battery management systems, USB interface protection, portable audio biasing, and smart wearable display regulation requiring stable component supply and RoHS-compliant sourcing.

Supply support for MM3Z15VT1 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 innovation for automotive, industrial, cloud, and edge applications.

The MM3Z15VT1 belongs to the MM3ZxxxT1 series of 200 mW Zener regulators designed specifically for miniaturized consumer electronics where board space, low leakage, and high ESD immunity are critical.

FAQ

What is the Zener voltage tolerance of MM3Z15VT1 at 25°C?

The MM3Z15VT1 has a guaranteed Zener voltage range of 14.3 V to 15.8 V at 5 mA test current and 25°C ambient, corresponding to a ±0.7 V absolute tolerance or ±4.7% of nominal 15.0 V. This tolerance is verified per the Electrical Characteristics table on page 2 of the official onsemi datasheet (Rev. 7, November 2006), and applies strictly under pulsed test conditions to minimize self-heating effects on MM3Z15VT1 measurement accuracy.

Does MM3Z15VT1 support lead-free reflow soldering?

Yes, MM3Z15VT1 is offered in a Pb-free package (indicated by the "G" suffix) with Sn-only lead plating, qualified for standard lead-free reflow profiles up to 260°C for 10 seconds. The device's maximum case temperature rating and void-free molded plastic construction ensure reliable intermetallic formation and mechanical integrity during JEDEC J-STD-020-compliant thermal cycling, making MM3Z15VT1 suitable for high-yield automated assembly.

What is the maximum allowable power dissipation for MM3Z15VT1 at 75°C ambient?

At 75°C ambient, MM3Z15VT1's power dissipation must be derated from its 200 mW rating at 25°C by 1.5 mW/°C. The allowable dissipation is therefore 200 mW − (1.5 mW/°C × 50°C) = 125 mW. This derating ensures junction temperature remains within the −65 to +150°C specification limit, preserving long-term reliability of MM3Z15VT1 in thermally constrained handheld enclosures.

How is polarity identified on the MM3Z15VT1 SOD−323 package?

MM3Z15VT1 uses a cathode band marking on the SOD−323 body: Pin 1 (cathode) is the terminal adjacent to the visible color band, while Pin 2 (anode) is the opposite, unmarked end. This marking aligns with the "Cathode Indicated by Polarity Band" specification in the Mechanical Characteristics section and is confirmed in the Marking Diagram on page 1 of the onsemi datasheet, ensuring correct orientation during pick-and-place and visual inspection of MM3Z15VT1 placement.

What is the typical Zener impedance of MM3Z15VT1 and why does it matter?

The typical Zener impedance (Z_ZT) of MM3Z15VT1 is 30 Ω maximum at 5 mA test current, measured under AC conditions (IZ(AC) = 0.1 × IZ(DC), f = 1 kHz). This value directly determines how tightly MM3Z15VT1 maintains its 15 V output under varying load currents - lower Z_ZT means less voltage droop during transient current demands, which is essential for stable reference generation in precision analog circuits using MM3Z15VT1.