Nexperia USA Inc. SZMM3Z5V1T1GX

Overview

SZMM3Z5V1T1GX from Nexperia is a Zener voltage regulator diode in SOD323 (SC-76) package, designed for precision low-voltage regulation at 5.1 V nominal with ±5 % tolerance, 2.0 Ω differential resistance at I_Z = 5 mA, and AEC-Q101 qualification for automotive use.

For engineers reviewing the SZMM3Z5V1T1GX datasheet, SZMM3Z5V1T1GX pinout, SZMM3Z5V1T1GX application, or SZMM3Z5V1T1GX equivalent, this part supports stable reference generation in space-constrained power rails, ESD-protected I/O clamping, and temperature-stable biasing where low forward voltage (≤1.1 V @ 100 mA) and fast transient response matter.

Technical Context

This Zener diode operates in reverse breakdown to maintain a stable 5.1 V reference across load and line variations, with a typical temperature coefficient of −2.7 mV/K at I_Z = 5 mA - enabling predictable drift compensation in analog sensing circuits.

Its 300 mW total power dissipation and 40 W non-repetitive peak reverse power capability (t_p = 100 µs) support both continuous regulation and short-duration surge suppression, while its 300 pF capacitance at 0 V (f = 1 MHz) limits high-frequency noise coupling in signal-path references.

Key Specifications

Pinout & Package

SOD323 (SC-76) surface-mount plastic package with cathode marked by a bar on the device body; compact 2-pin outline optimized for automated placement and reflow soldering.

Key Features

Applications

Availability

SZMM3Z5V1T1GX is available at Aetrix Electronics and suitable for automotive sensor modules, USB interface protection, industrial PLC inputs, and low-power MCU reset circuits requiring stable component supply with AEC-Q101 assurance.

Supply support for SZMM3Z5V1T1GX 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 global semiconductor company specializing in high-performance, high-reliability discrete, logic, and MOSFET devices, headquartered in Nijmegen, Netherlands.

The SZMM3Z series targets automotive and industrial applications demanding robust, miniature Zener regulation - engineered for AEC-Q101 compliance, low thermal resistance, and consistent parametric performance across temperature extremes.

FAQ

What is the maximum steady-state current this Zener can regulate at 5.1 V?

The SZMM3Z5V1T1GX has a total power dissipation limit of 300 mW at 25 °C ambient on FR4 PCB. At 5.1 V, this supports up to ~59 mA continuous Zener current (P = V × I → I = 300 mW / 5.1 V). Derating applies above 25 °C per R_th(j-a) = 415 K/W.

How does the −2.7 mV/K temperature coefficient affect regulation accuracy over temperature?

At I_Z = 5 mA, the Zener voltage shifts −2.7 mV per °C rise. From 25 °C to 125 °C (ΔT = 100 K), V_Z decreases by 270 mV - resulting in 4.84 V to 5.10 V span. This is within the initial ±5 % tolerance band and remains usable for non-critical biasing.

Can this device be used in parallel for higher power handling?

No - Zener diodes exhibit negative temperature coefficients and mismatched V_Z tolerances, causing current hogging if paralleled. For higher power, use a single higher-rated Zener or switch to an active shunt regulator IC with thermal sharing capability.

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

Yes - Nexperia specifies compatibility with JEDEC J-STD-020D reflow profiles. The SOD323 outline (Fig. 12) uses 0.6 mm × 0.5 mm solder lands and 1.65 mm center-to-center pitch, supporting peak temperatures up to 260 °C for ≤30 seconds without damage.