Nexperia USA Inc. MM3Z3V9T1GX

Overview

MM3Z3V9T1GX from Nexperia is a Zener diode designed for precision voltage regulation in low-power circuits, with a nominal Zener voltage of 3.9 V (±5 % tolerance), differential resistance of 3.0 Ω at I_Z = 5 mA, and total power dissipation up to 300 mW in an SOD323 (SC-76) surface-mount package. It operates across −55 °C to +150 °C ambient temperature and supports general-purpose regulation in space-constrained consumer and industrial PCBs.

For engineers reviewing the MM3Z3V9T1GX datasheet, MM3Z3V9T1GX pinout, MM3Z3V9T1GX application, or MM3Z3V9T1GX equivalent, key selection criteria include its 3.7–4.1 V Zener voltage range, low 3.0 Ω dynamic impedance, cathode-anode polarity marking (bar indicates cathode), thermal resistance of 415 K/W (junction-to-ambient), and compatibility with reflow/wave soldering per IPC-J-STD-020.

Technical Context

This device functions as a two-terminal shunt voltage regulator, maintaining stable output voltage by conducting reverse current when applied voltage exceeds its Zener breakdown threshold. Its operation relies on controlled avalanche or Zener breakdown depending on voltage level - at 3.9 V, it operates primarily in Zener mode with low temperature coefficient (−3.5 mV/K).

The diode exhibits low forward voltage (1.1 V at I_F = 100 mA) and high surge capability (40 W non-repetitive peak reverse power at t_p = 100 µs), enabling transient suppression in conjunction with regulation. Thermal performance is defined for FR4 PCB mounting with single-sided copper, where junction-to-solder-point resistance is 110 K/W.

Key Specifications

Pinout & Package

MM3Z3V9T1GX uses the SOD323 (SC-76) plastic surface-mount package: 2-pin, 1.35 mm × 0.85 mm body size, 0.45 mm pitch, cathode marked by a bar on the top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX384-B3V9,115, MM3Z3V9T1GX offers lower cost and identical footprint but trades off tighter tolerance and higher power rating; versus 1SMA5914BT3G, it delivers superior regulation accuracy and miniaturization at the expense of surge capacity and thermal derating headroom.

Availability

MM3Z3V9T1GX is available at Aetrix Electronics and suitable for voltage reference generation, overvoltage protection, low-power LDO stabilization, and DC-level restoration requiring stable component supply across high-mix production runs.

Supply support for MM3Z3V9T1GX 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

Nexperia is a leading semiconductor manufacturer specializing in high-performance, energy-efficient logic, discrete, and MOSFET devices, headquartered in Nijmegen, Netherlands.

The MM3Z series belongs to Nexperia's general-purpose Zener diode product line, engineered for compact, reliable voltage regulation in cost-sensitive consumer, computing, and industrial applications where SOD323 packaging and ±5 % tolerance meet system requirements.

FAQ

What is the maximum continuous reverse current this diode can handle at 3.9 V?

The MM3Z3V9T1GX is not rated for continuous reverse current at its Zener voltage - it regulates by dissipating power as heat. At 3.9 V, the maximum continuous current is derived from P_tot = 300 mW, yielding I_Z(max) ≈ 77 mA at 25 °C ambient on FR4 PCB. Derating applies above 25 °C per R_th(j-a) = 415 K/W.

Can this Zener diode be used in series with another to achieve higher regulated voltage?

Yes, multiple MM3Z3V9T1GX diodes may be connected in series to sum Zener voltages (e.g., two yield ~7.8 V), but mismatched tolerances (±5 % each) result in ±7.1 % cumulative error. Differential resistance also sums linearly (6.0 Ω), increasing regulation sensitivity to current changes.

How does the cathode marking align with PCB silkscreen for SOD323 placement?

The cathode (pin 1) is marked by a bar on the top surface of the SOD323 package. On PCB silkscreen, this corresponds to the end with the rectangular marker or "K" indicator adjacent to the pad - matching the "bar → cathode" convention used in Nexperia's recommended footprints (Fig. 12 and 13).

Is this device suitable for automotive applications per AEC-Q200?

No - MM3Z3V9T1GX is not AEC-Q200 qualified. Nexperia explicitly states in its legal disclaimers that non-automotive qualified products like the MM3Z series are unsuitable for safety-critical or life-support systems, including automotive ECUs, ADAS modules, or powertrain control units.