onsemi SZMM3Z3V0T1G

Overview

SZMM3Z3V0T1G from onsemi is a 3.0 V ±0.2 V Zener voltage regulator diode in SOD−323 package, rated for 300 mW steady-state power dissipation at 25°C, with 100 Ω maximum Zener impedance at 5 mA test current and 10 µA reverse leakage at 1.0 V reverse voltage - used for precision voltage reference and overvoltage protection in space-constrained portable electronics.

For engineers reviewing the SZMM3Z3V0T1G datasheet, pinout, applications, or equivalent options, key selection factors include its AEC−Q101 qualification, 16 kV HBM ESD rating, low 0.9 mm body height, and tight 2.8 V to 3.2 V Zener voltage tolerance at IZT = 5 mA.

Technical Context

This device operates as a two-terminal shunt voltage regulator, maintaining stable 3.0 V output across load variations by conducting reverse current above its breakdown threshold. It exhibits −3.5 mV/°C temperature coefficient and 450 pF junction capacitance at 0 V bias and 1 MHz, enabling use in low-noise analog reference and transient suppression circuits.

Designed for surface-mount assembly on FR-4 PCBs, it supports reflow soldering up to 260°C for 10 seconds and features Pb-free plating (Sn only), UL 94 V−0 flammability rating, and cathode polarity band marking - meeting automotive-grade reliability requirements per AEC−Q101.

Key Specifications

Pinout & Package

SOD−323 surface-mount package with molded plastic case, cathode indicated by polarity band; total weight 4.507 mg/unit, UL 94 V−0 rated, mountable in any orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX384-B3V0,115 and MMSZ3V0T1G, the SZMM3Z3V0T1G delivers guaranteed automotive qualification, tighter production lot control, and validated 300 mW thermal performance - making it the sole choice for safety-critical or PPAP-mandated programs.

Availability

SZMM3Z3V0T1G is available at Aetrix Electronics and suitable for smartphone power rail clamping, wearable sensor reference, and automotive cabin controller applications requiring stable component supply, long-term lifecycle support, and AEC−Q101 compliance.

Supply support for SZMM3Z3V0T1G 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 edge applications.

SZMM3Z3V0T1G belongs to the MM3ZxxxT1G/SZMM3ZxxxT1G Zener regulator family, engineered for high-reliability voltage reference and transient suppression in miniaturized, high-density electronic systems.

FAQ

What is the Zener voltage tolerance of SZMM3Z3V0T1G at 5 mA test current?

The SZMM3Z3V0T1G has a Zener voltage range of 2.8 V minimum to 3.2 V maximum at I_ZT = 5 mA, corresponding to a ±0.2 V absolute tolerance or ±6.7% relative to nominal 3.0 V. This tolerance is guaranteed across production lots and verified per onsemi's AEC−Q101 qualification testing protocol for SZ-prefix devices.

Is SZMM3Z3V0T1G suitable for automotive applications?

Yes, SZMM3Z3V0T1G is explicitly AEC−Q101 qualified and PPAP capable, with SZ-prefix denoting automotive-specific site and process controls. Its 16 kV HBM ESD rating, −65°C to +150°C operating range, and validated reflow compatibility make it approved for use in engine control units, body electronics, and infotainment systems.

What is the thermal resistance junction-to-ambient for SZMM3Z3V0T1G?

The thermal resistance junction-to-ambient (R_JA) of SZMM3Z3V0T1G is 416°C/W when mounted on a single-sided FR-4 PCB with 1 cm² copper pad. This value determines the allowable ambient temperature rise at 300 mW dissipation and informs thermal design margins in enclosed or high-temperature environments.

How does the temperature coefficient affect SZMM3Z3V0T1G's regulation accuracy?

SZMM3Z3V0T1G has a temperature coefficient of −3.5 mV/°C, meaning its Zener voltage decreases by 3.5 mV per degree Celsius rise in junction temperature. At 85°C ambient (assuming ~25°C rise), this yields ~−87.5 mV shift - critical for precision references but acceptable for clamping where absolute accuracy is secondary to response speed.

Can SZMM3Z3V0T1G replace MMSZ3V0T1G in existing designs?

SZMM3Z3V0T1G shares identical electrical specifications and SOD−323 mechanical form factor with MMSZ3V0T1G, but adds AEC−Q101 qualification, enhanced traceability, and automotive-grade change control. Replacement is electrically seamless, though design validation may be required for PPAP submission in automotive programs.