Nexperia USA Inc. SZMM3Z3V0T1GX

Overview

SZMM3Z3V0T1GX from Nexperia is a Zener voltage regulator diode in SOD323 (SC-76) package, designed for precision low-voltage regulation at 3.0 V nominal with ±5 % tolerance, 10 Ω differential resistance at I_Z = 5 mA, and AEC-Q101 qualification for automotive power rail stabilization.

For engineers reviewing the SZMM3Z3V0T1GX datasheet, SZMM3Z3V0T1GX pinout, SZMM3Z3V0T1GX application, or SZMM3Z3V0T1GX equivalent, this device supports low-power biasing, overvoltage clamping, and reference voltage generation where compact size, thermal robustness, and automotive-grade reliability are required.

Technical Context

This Zener diode operates in reverse breakdown to maintain stable 3.0 V across its terminals under regulated current conditions (I_Z = 5 mA), with forward voltage ≤ 1.1 V at 100 mA and reverse leakage < 100 µA at 2.4 V. Its junction-to-ambient thermal resistance is 415 K/W on FR4 PCB.

It features low dynamic impedance (10 Ω), negative temperature coefficient (−3.5 mV/K), and non-repetitive peak reverse power capability of 40 W (100 µs square wave), enabling transient suppression in space-constrained automotive and industrial control circuits.

Key Specifications

Pinout & Package

SOD323 (SC-76) surface-mount plastic package with cathode marked by bar on top surface; optimized for reflow soldering per IPC-7095 guidelines and compatible with standard 0201-class pick-and-place equipment.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX384-B3V0,115 and MMSZ3V0T1G, SZMM3Z3V0T1GX uniquely balances AEC-Q101 compliance, 300 mW power rating, and minimal 2.3 mm × 1.35 mm footprint - making it optimal for space-constrained automotive modules requiring both reliability and density.

Availability

SZMM3Z3V0T1GX is available at Aetrix Electronics and suitable for automotive sensor biasing, USB port overvoltage clamping, and industrial PLC input protection requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SZMM3Z3V0T1GX 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 global semiconductor expert focused on high-volume, high-reliability logic, discrete, and MOSFET components, with leadership in automotive-qualified small-signal devices.

This device belongs to the SZMM3Z series of AEC-Q101-qualified Zener diodes engineered specifically for precision voltage regulation and transient suppression in automotive power domains and space-constrained industrial systems.

FAQ

What is the maximum continuous reverse current this Zener can handle at 3.0 V regulation?

The device is rated for 200 mA maximum forward current, but for Zener operation, the recommended test current is 5 mA. At that condition, it maintains 3.0 V ±5 % with 10 Ω dynamic resistance. Continuous reverse current beyond 50 mA risks exceeding 300 mW total power dissipation unless heatsinking or derating is applied per thermal resistance data (R_th(j-a) = 415 K/W).

How does the −3.5 mV/K temperature coefficient affect circuit performance over temperature?

The negative coefficient means output voltage decreases by approximately 3.5 mV per Kelvin rise in junction temperature. From 25 °C to 125 °C (ΔT = 100 K), the Zener voltage shifts down ~350 mV - from 3.0 V to ~2.65 V. This must be accounted for in precision references; however, it improves thermal stability in clamping applications where lower voltage at high temperature aligns with reduced semiconductor breakdown thresholds.

Can this diode replace a 3.3 V Zener in an existing design?

No - SZMM3Z3V0T1GX is specified at 3.0 V nominal (2.80–3.20 V), not 3.3 V. Substituting it for a 3.3 V part would reduce regulation voltage by ~300 mV, potentially causing undervoltage faults in circuits relying on that threshold. The SZMM3Z3V3T1G variant (3.10–3.50 V) is the correct 3.3 V option in the same series and package.

Is the SOD323 package compatible with standard reflow profiles for lead-free assembly?

Yes - Nexperia specifies compatibility with IPC/JEDEC J-STD-020D reflow profiles. The SOD323 outline supports peak temperatures up to 260 °C for ≤ 30 seconds, with recommended solder paste stencil apertures of 0.5 mm × 0.6 mm per pad (Fig. 12). Thermal resistance data assumes standard FR4 PCB with single-sided 1 oz copper and tin plating.