Nexperia USA Inc. SZMM5Z9V1T5GF

Overview

SZMM5Z9V1T5GF from Nexperia is a Zener voltage regulator diode in SOD523 (SC-79) package, designed for precision voltage reference and overvoltage protection in space-constrained circuits. It delivers a nominal 9.1 V Zener voltage at 5 mA with ±2 % tolerance, 0.5 Ω differential resistance, and AEC-Q101 qualification for automotive use.

For engineers reviewing the SZMM5Z9V1T5GF datasheet, SZMM5Z9V1T5GF pinout, SZMM5Z9V1T5GF application, or SZMM5Z9V1T5GF equivalent, key selection criteria include Zener voltage accuracy, low r_diff, thermal resistance (R_th(j-sp) = 65 K/W), surge capability (40 W non-repetitive), and automotive-grade reliability.

Technical Context

This device operates as a two-terminal shunt regulator, maintaining stable output voltage by conducting reverse current above its breakdown threshold. Its low 0.5 Ω differential resistance ensures minimal voltage deviation under load variation, while the −55 °C to +150 °C ambient operating range supports under-hood automotive environments.

The SOD523 package enables high-density PCB layouts with minimal footprint (1.25 mm × 0.85 mm), and its cathode-marked anode-cathode configuration simplifies orientation during automated placement. Thermal performance is optimized via low junction-to-solder-point resistance (65 K/W), enabling reliable power dissipation up to 300 mW at 25 °C ambient.

Key Specifications

Pinout & Package

Package: SOD523 (SC-79), ultra-small surface-mount plastic package (1.25 mm × 0.85 mm × 0.65 mm height), with cathode indicated by marking bar.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX584-C9V1 and MMSZ5240B, SZMM5Z9V1T5GF offers superior voltage accuracy (±2 % vs. ±5 %), lower dynamic impedance (0.5 Ω vs. ≥10 Ω), and certified automotive reliability-making it the sole choice for safety-adjacent or high-stability applications.

Availability

SZMM5Z9V1T5GF is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor signal chains, LED driver reference circuits, and power supply overvoltage protection requiring stable component supply and AEC-Q101 assurance.

Supply support for SZMM5Z9V1T5GF 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 essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.

SZMM5Z9V1T5GF belongs to the SZMM5Z series of AEC-Q101-qualified Zener diodes engineered specifically for space-constrained, high-reliability automotive voltage regulation and transient suppression.

FAQ

What is the maximum continuous reverse current this Zener can handle at 9.1 V?

The device is rated for total power dissipation of 300 mW at 25 °C ambient. At 9.1 V, this corresponds to a maximum continuous reverse current of approximately 33 mA (300 mW ÷ 9.1 V). Derating is required above 25 °C per the R_th(j-a) = 350 K/W thermal resistance specification.

Can SZMM5Z9V1T5GF be used in place of a 9.1 V Zener in an existing SOD-123 design?

No-it uses the smaller SOD523 (SC-79) package (1.25 mm × 0.85 mm), whereas SOD-123 measures 2.9 mm × 1.3 mm. Footprint, solder pad geometry, and reflow profile differ significantly; direct substitution requires PCB redesign and validation of thermal performance under the tighter thermal constraints of the smaller package.

How does the temperature coefficient affect regulation accuracy over automotive temperature range?

At 9.1 V, the temperature coefficient is specified as +3.8 to +7.0 mV/K. Over −40 °C to +125 °C (165 K span), this introduces a worst-case drift of +1.16 V (7.0 mV/K × 165 K), shifting regulation from 9.1 V to ~10.26 V. System-level compensation or tolerance budgeting must account for this in precision applications.

Is the 40 W surge rating applicable to repetitive pulses?

No-the 40 W non-repetitive peak reverse power dissipation applies only to single square-wave pulses of 100 µs duration at 25 °C junction temperature prior to surge. Repetitive surges require average power calculation and thermal analysis using R_th(j-a) = 350 K/W; exceeding 300 mW average power risks thermal runaway and permanent failure.