onsemi MM5Z4699T5G

Overview

MM5Z4699T5G from onsemi is a 500 mW, 12 V nominal Zener voltage regulator diode in SOD−523 package, with 50 μA test current (IZT), 0.05 μA reverse leakage at 9.1 V (VR), and ±5% voltage tolerance. It provides precision voltage reference and overvoltage clamping in space-constrained portable electronics.

For engineers reviewing the MM5Z4699T5G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy at IZT = 50 μA, low IR at VR = 9.1 V, thermal derating above 75°C, and ESD robustness (>16 kV HBM) for handheld device protection circuits.

Technical Context

This Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under varying load and temperature conditions. Its 12 V nominal Zener voltage (min 11.4 V, max 12.6 V) is specified at IZT = 50 μA, with a typical temperature coefficient near zero in this range, enabling stable reference performance from −55°C to +150°C.

The SOD−523 package supports high-density PCB layouts and automated assembly, while its 250°C/W junction-to-ambient thermal resistance requires careful board layout for power dissipation management. The device achieves Class 3 ESD rating (>16 kV HBM) without external protection components.

Key Specifications

Pinout & Package

SOD−523 surface-mount package: 1.20 mm × 0.80 mm × 0.60 mm footprint, cathode marked by polarity band, void-free thermosetting plastic case rated UL 94 V−0.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX584-C12 and MMSZ4699T1G, MM5Z4699T5G delivers identical 12 V regulation with superior space efficiency (1.2 × 0.8 mm), higher ESD rating (>16 kV vs. 8 kV), and optimized thermal performance for high-density portable PCBs.

Availability

MM5Z4699T5G is available at Aetrix Electronics and suitable for smartphone power rail protection, IoT sensor reference voltage generation, and wearable device battery monitoring requiring stable component supply and full traceability.

Supply support for MM5Z4699T5G 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, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The MM5Z4xxxTxG series is designed specifically for compact, high-reliability voltage regulation in portable and space-constrained electronics, emphasizing low leakage, high ESD immunity, and consistent Zener voltage tolerance.

FAQ

What is the Zener voltage tolerance of MM5Z4699T5G?

The MM5Z4699T5G has a nominal Zener voltage of 12 V with a tolerance of ±5%, meaning the actual measured voltage falls between 11.4 V and 12.6 V when tested at IZT = 50 μA and TA = 25°C. This tight tolerance ensures predictable clamping behavior in precision reference and protection circuits where voltage margin is critical.

Does MM5Z4699T5G require a heatsink in standard PCB layouts?

No, MM5Z4699T5G does not require an external heatsink under typical operating conditions. Its 500 mW power rating is validated on FR-5 board with minimum recommended footprint, and its 250°C/W junction-to-ambient thermal resistance allows safe operation up to 75°C board temperature. For sustained 500 mW dissipation above 75°C, thermal relief copper or airflow must be added.

What is the reverse leakage current specification for MM5Z4699T5G?

The MM5Z4699T5G specifies a maximum reverse leakage current (IR) of 0.05 μA at VR = 9.1 V and TA = 25°C. This ultra-low leakage supports long battery life in always-on sensor nodes and ensures minimal loading on high-impedance reference circuits where even nanoamp-level currents affect accuracy.

Is MM5Z4699T5G suitable for automotive applications?

Yes, the SZMM5Z4699T5G variant is AEC-Q101 qualified and PPAP capable for automotive use, but the standard MM5Z4699T5G is not automotive-qualified. For under-hood or ADAS applications requiring automotive reliability, engineers must specify the SZ prefix version, which includes enhanced process controls and site-specific qualification testing beyond the commercial-grade MM5Z4699T5G.

How does the SOD−523 package of MM5Z4699T5G compare to SOD−123 in size?

The SOD−523 package of MM5Z4699T5G measures 1.20 mm × 0.80 mm × 0.60 mm, while the SOD−123 package is 3.7 mm × 1.6 mm × 1.1 mm - making MM5Z4699T5G over 70% smaller in footprint area. This reduction enables placement in tight spaces like smartphone camera modules and ultra-thin wearables where board real estate is constrained.