onsemi MM3Z2V4T1

Overview

MM3Z2V4T1 from onsemi is a 2.4 V ±0.2 V nominal Zener voltage regulator diode in SOD−323 package, rated for 200 mW steady-state power dissipation at 25°C, with 100 Ω maximum Zener impedance at 5 mA test current, used for precision low-voltage reference and overvoltage protection in space-constrained portable electronics.

For engineers reviewing the MM3Z2V4T1 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, ESD robustness (Class 3, >16 kV HBM), and direct alternative part comparisons for voltage reference design validation.

Technical Context

The MM3Z2V4T1 operates as a two-terminal silicon Zener diode optimized for reverse-biased regulation at low voltages (2.2–2.6 V range). Its 1000 Ω maximum Zener impedance at IZK = 0.5 mA enables stable clamping under light-load conditions, while its −3.5 mV/°C temperature coefficient ensures predictable drift across −65°C to +150°C junction range.

Designed for surface-mount use on FR-4 PCBs, it features Pb-free plating, UL 94 V−0 flammability rating, and 260°C/10s soldering tolerance. The cathode-anode polarity is marked by a band, and mechanical dimensions are tightly controlled per CASE 477−02 (1.7 mm × 1.25 mm × 0.9 mm).

Key Specifications

Pinout & Package

SOD−323 surface-mount package with molded plastic case (UL 94 V−0), cathode indicated by polarity band, leads plated with Sn-only (Pb-free), and mounting position unrestricted.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MM3Z2V4T1, BZX384-B2V4 offers greater power headroom but slightly degraded impedance, while MMSZ4678 trades miniaturization for superior leakage performance and thermal capacity-selection depends on priority between PCB density, leakage budget, and power margin.

Availability

MM3Z2V4T1 is available at Aetrix Electronics and suitable for smartphone power management, USB-C port protection, and wearable battery monitoring requiring stable component supply, RoHS compliance, and high-volume tape-and-reel delivery.

Supply support for MM3Z2V4T1 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 power management, analog, sensing, and connectivity solutions.

The MM3Z2V4T1 belongs to the MM3ZxxxT1 series of miniature Zener regulators designed specifically for space-constrained, low-power portable electronics requiring precision voltage references and robust ESD protection.

FAQ

What is the Zener voltage tolerance of MM3Z2V4T1 at 5 mA test current?

The MM3Z2V4T1 has a Zener voltage specification of 2.2 V minimum, 2.4 V nominal, and 2.6 V maximum at I_ZT = 5 mA and T_A = 25°C. This ±0.2 V tolerance ensures consistent regulation performance across production lots and supports accurate 2.4 V reference design without post-assembly calibration. The MM3Z2V4T1's tight spread is maintained via process-controlled doping and wafer-level testing.

Does MM3Z2V4T1 support Pb-free reflow soldering processes?

Yes, MM3Z2V4T1 is qualified for Pb-free reflow soldering with a maximum peak temperature of 260°C for 10 seconds, per JEDEC J-STD-020. Its Sn-only lead finish and UL 94 V−0 mold compound ensure compatibility with standard lead-free assembly lines. The MM3Z2V4T1's thermal resistance (R_JA = 635 °C/W) must be considered when designing PCB copper pour to avoid exceeding 150°C junction temperature during sustained operation.

How does the temperature coefficient affect MM3Z2V4T1 performance in automotive cabin applications?

The MM3Z2V4T1 exhibits a temperature coefficient of −3.5 mV/°C, meaning its Zener voltage decreases linearly with rising temperature. Over a −40°C to +85°C automotive cabin range, this results in approximately ±440 mV total drift from nominal 2.4 V. For applications requiring tighter stability, the MM3Z2V4T1 should be used with compensation circuitry or within narrower ambient bands; its specified T_J range (−65°C to +150°C) confirms operational viability in under-hood proximity zones.

Can MM3Z2V4T1 replace a 2.4 V Zener in a 10 µA bias network?

Yes, the MM3Z2V4T1 draws only 50 µA maximum leakage current at V_R = 1.0 V, making it suitable for low-current bias networks. However, its Zener conduction begins near 2.2 V, so operation below that voltage relies solely on leakage. For reliable regulation at 10 µA, verify that the network's Thevenin equivalent voltage exceeds 2.2 V and that series resistance limits current to maintain <200 mW dissipation. The MM3Z2V4T1's 1000 Ω Z_ZK at I_ZK = 0.5 mA also affects regulation sharpness in micro-power designs.

What is the maximum allowable reverse voltage before significant leakage occurs in MM3Z2V4T1?

Per the datasheet, MM3Z2V4T1 specifies 50 µA maximum reverse leakage current at V_R = 1.0 V. Leakage remains well below 1 µA up to ~1.8 V, then rises exponentially as voltage approaches the 2.2 V Zener knee. Therefore, the practical maximum reverse voltage for low-leakage operation is ~1.8 V. Exceeding this risks unpredictable current draw and potential thermal runaway if series resistance is insufficient to limit power dissipation. The MM3Z2V4T1's defined V_Z range starts at 2.2 V, confirming 1.8 V as a safe non-conducting upper bound.