onsemi SZMM5Z4678T1G

Overview

SZMM5Z4678T1G from onsemi is a 1.8 V, 500 mW SOD−523 Zener diode optimized for low-leakage voltage regulation in space-constrained portable electronics; it delivers 1.71–1.89 V nominal Zener voltage at 50 µA test current, 7.5 µA max reverse leakage at 1 V, and meets AEC−Q101 for automotive use.

For engineers reviewing the SZMM5Z4678T1G datasheet, pinout, applications, or equivalent options, key selection criteria include its 1.8 V regulation tolerance, ultra-low I_R at low VR, SOD−523 footprint compatibility, and Class 3 ESD robustness (>16 kV HBM) in high-density PCB layouts.

Technical Context

This Zener regulator operates with a tightly controlled 1.8 V nominal breakdown voltage (±5% min/max), specified at 50 µA test current (I_ZT) and validated across −55°C to +150°C junction temperature range. Its thermal resistance is 250°C/W (Junction-to-Ambient), enabling stable regulation under 500 mW dissipation on FR−5 board at T_L = 75°C.

The device features a cathode-band polarity indicator, Pb−Free RoHS-compliant SOD−523 package (1.20 × 0.80 × 0.60 mm), and 16 kV HBM ESD rating - critical for handheld and automotive infotainment power rail protection where board area and reliability are co-constrained.

Key Specifications

Pinout & Package

SOD−523 surface-mount package (Case 502, Style 1): 1.20 mm × 0.80 mm × 0.60 mm footprint with cathode indicated by polarity band; optimized for high-speed pick-and-place and reflow soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX584C1V8LT1G and MMSZ4678T1G, SZMM5Z4678T1G uniquely combines AEC−Q101 qualification, 500 mW power rating, and minimal SOD−523 footprint - making it the only choice for space-constrained, safety-critical automotive voltage references requiring full production traceability.

Availability

SZMM5Z4678T1G is available at Aetrix Electronics and suitable for smartphone power rail protection, automotive infotainment MCU reset, and wearable sensor bias networks requiring stable component supply, long-term lifecycle support, and automotive-grade traceability.

Supply support for SZMM5Z4678T1G 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.

SZMM5Z4xxxTxG series Zeners are engineered for high-reliability, space-constrained voltage regulation - targeting automotive electronics, portable communications, and industrial sensing where AEC−Q101 compliance and ultra-small packaging are mandatory.

FAQ

What is the nominal Zener voltage of SZMM5Z4678T1G and how tightly is it specified?

The SZMM5Z4678T1G has a nominal Zener voltage of 1.8 V, with a guaranteed range of 1.71 V to 1.89 V at I_ZT = 50 µA and T_A = 25°C. This ±5% tolerance is validated across the full −55°C to +150°C operating junction temperature range, ensuring predictable clamping performance in both consumer and automotive environments.

Does SZMM5Z4678T1G meet automotive qualification standards?

Yes, SZMM5Z4678T1G is AEC−Q101 qualified and PPAP capable, as confirmed by its SZ-prefix designation and onsemi's official datasheet. It undergoes rigorous stress testing including HTOL, temperature cycling, and ESD verification - fulfilling requirements for use in automotive infotainment, body control, and ADAS subsystems.

What is the maximum reverse leakage current for SZMM5Z4678T1G at 1 V reverse bias?

The maximum reverse leakage current (I_R) for SZMM5Z4678T1G is 7.5 µA when biased at V_R = 1 V and T_A = 25°C. This ultra-low leakage supports energy-sensitive applications such as battery-backed RTC circuits and always-on sensor nodes where standby current must remain below 10 µA.

Which package type does SZMM5Z4678T1G use and what are its dimensions?

SZMM5Z4678T1G uses the SOD−523 package (Case 502, Style 1), measuring 1.20 mm × 0.80 mm × 0.60 mm. Its cathode is marked by a visible polarity band, and it is designed for compatibility with standard high-speed pick-and-place equipment and lead-free reflow profiles.

How does the power dissipation capability of SZMM5Z4678T1G compare to similar Zener diodes in SOD−523 packages?

SZMM5Z4678T1G delivers 500 mW total power dissipation on FR−5 board at T_L = 75°C - 67% higher than typical 300 mW SOD−523 Zeners like BZX584C1V8LT1G. Its 250°C/W thermal resistance allows sustained operation in thermally dense layouts without external heatsinking.