onsemi SZMM3Z6V8T1G

Overview

SZMM3Z6V8T1G from onsemi is a 6.8 V, 300 mW Zener voltage regulator diode in SOD−323 package, designed for precision voltage reference and overvoltage protection in space-constrained portable electronics. It delivers ±5% nominal Zener voltage tolerance at 5 mA test current, 15 Ω dynamic impedance, and 2 µA leakage at 4.0 V reverse bias, supporting stable regulation in battery-powered handsets and high-density PCBs.

For engineers reviewing the SZMM3Z6V8T1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy (6.4–7.2 V), low-profile SOD−323 footprint (1.7 × 1.25 × 0.9 mm), AEC−Q101 qualification, and Class 3 ESD robustness (>16 kV HBM).

Technical Context

This device operates as a two-terminal shunt regulator, maintaining stable output voltage across variable load currents by conducting excess current to ground when input exceeds its Zener breakdown threshold. Its 15 Ω Zener impedance at 5 mA ensures minimal voltage deviation under dynamic load changes.

Designed for surface-mount assembly on FR-4 boards, it features Pb-free plating, UL 94 V-0 flammability rating, and 260°C/10s soldering tolerance. The cathode-anode polarity is marked with a band, and thermal resistance is 416°C/W junction-to-ambient.

Key Specifications

Pinout & Package

SOD−323 surface-mount plastic package with void-free transfer-molded construction, corrosion-resistant finish, and cathode indicated by polarity band. Mounting position is unrestricted.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX384-B6V8,115 and MMSZ4687T1G, the SZMM3Z6V8T1G uniquely balances AEC−Q101 compliance, 300 mW capability, and minimal 1.7 × 1.25 mm footprint-making it optimal for automotive and portable designs where qualification, size, and performance intersect.

Availability

SZMM3Z6V8T1G is available at Aetrix Electronics and suitable for cellular phone power management, USB-C port protection, and automotive body control modules requiring stable component supply with full traceability and lifecycle support.

Supply support for SZMM3Z6V8T1G 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 (Nasdaq: ON) is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.

The SZMM3ZxxxT1G series is part of onsemi's precision Zener regulator portfolio, engineered specifically for space-constrained, high-reliability applications demanding AEC−Q101 qualification and low-profile SOD−323 packaging.

FAQ

What is the Zener voltage tolerance of SZMM3Z6V8T1G at 5 mA test current?

The SZMM3Z6V8T1G has a Zener voltage range of 6.4 V to 7.2 V at I_ZT = 5 mA, corresponding to ±5% tolerance around the nominal 6.8 V rating. This tolerance is verified per the onsemi datasheet revision 11 and applies under standard 25°C ambient conditions with pulse testing to minimize self-heating effects on SZMM3Z6V8T1G measurements.

Is SZMM3Z6V8T1G suitable for automotive applications?

Yes, SZMM3Z6V8T1G is AEC−Q101 qualified and PPAP capable, with an SZ prefix indicating compliance for automotive and other applications requiring unique site and control change requirements. Its −65°C to +150°C junction temperature range, Class 3 HBM ESD rating, and Pb-free construction make SZMM3Z6V8T1G appropriate for under-hood and cabin ECUs where reliability and regulatory alignment are critical.

What is the maximum Zener impedance of SZMM3Z6V8T1G and at what condition is it specified?

The maximum Zener impedance (Z_ZT) of SZMM3Z6V8T1G is 15 Ω, measured at the test current I_ZT = 5 mA and ambient temperature T_A = 25°C. This value reflects dynamic AC impedance and directly impacts output voltage stability during load transients-lower Z_ZT means less regulation error under varying current demand in circuits using SZMM3Z6V8T1G.

How does the SOD−323 package of SZMM3Z6V8T1G compare dimensionally to standard SOD−123?

The SOD−323 package of SZMM3Z6V8T1G measures 1.7 mm × 1.25 mm × 0.9 mm, significantly smaller than the SOD−123's typical 3.5 mm × 1.6 mm footprint. This 60% smaller PCB area enables denser routing in portable devices. The reduced height also supports ultra-thin form factors where SZMM3Z6V8T1G replaces larger Zeners without redesigning mechanical stack-ups.

What is the reverse leakage current specification for SZMM3Z6V8T1G at 4.0 V?

SZMM3Z6V8T1G specifies a maximum reverse leakage current (I_R) of 2 µA at V_R = 4.0 V and T_A = 25°C. This low leakage ensures minimal quiescent power draw in always-on circuits-critical for battery-operated systems where cumulative leakage across multiple SZMM3Z6V8T1G devices could impact standby life.