onsemi MMSZ4682T1

Overview

MMSZ4682T1 from onsemi is a 2.7 V, 500 mW surface-mount Zener diode in SOD−123 package, designed for precision voltage regulation and reference applications in low-power analog circuits, power supply feedback paths, and overvoltage protection. It delivers nominal Zener voltage of 2.7 V at 50 µA test current, with ±5% tolerance (2.565–2.835 V), 1 µA reverse leakage at 1 V, and 150 °C maximum junction temperature.

For engineers reviewing the MMSZ4682T1 datasheet, pinout, applications, or equivalent options, key selection criteria include its low I_ZT (50 µA), tight V_Z tolerance, ESD robustness (>16 kV HBM), thermal resistance (R_JL = 150 °C/W), and Pb-free SOD−123 footprint compatibility with automated assembly.

Technical Context

This device operates as a two-terminal voltage reference by maintaining a stable reverse breakdown voltage across its cathode-anode terminals under controlled Zener current. Its low 50 µA test current enables accurate regulation in ultra-low-power bias networks and sensor excitation circuits without excessive quiescent draw.

The SOD−123 package provides optimized thermal performance (R_JL = 150 °C/W) and mechanical reliability for FR-4/FR-5 PCBs, while its Class 3 ESD rating (>16 kV HBM) supports robust operation in handheld and industrial environments where electrostatic discharge is a concern.

Key Specifications

Pinout & Package

SOD−123 plastic surface-mount package (1.60 × 2.69 × 1.16 mm), void-free thermosetting case with corrosion-resistant finish, cathode indicated by band. Rated for 260°C soldering (10 s).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMSZ4682T1, BZX584C2V7 offers smaller footprint but reduced thermal margin and power capability, while MMSZ4682T1G provides identical performance with enhanced compliance documentation-making it ideal for production programs requiring full Pb-free audit trails.

Availability

MMSZ4682T1 is available at Aetrix Electronics and suitable for portable sensor biasing, USB-C power monitor references, and industrial PLC input protection requiring stable component supply, consistent parametric performance, and long-term lifecycle support.

Supply support for MMSZ4682T1 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 MMSZ4xxxT1G series was developed to provide high-reliability, low-power Zener regulation in compact SOD−123 packages for space-constrained and low-quiescent-current systems-especially where ESD hardness and thermal predictability are critical.

FAQ

What is the nominal Zener voltage and tolerance of the MMSZ4682T1?

The MMSZ4682T1 has a nominal Zener voltage of 2.7 V with a tolerance of ±5%, corresponding to a guaranteed range of 2.565 V to 2.835 V at 50 µA test current (I_ZT). This tight tolerance supports precision voltage referencing in analog signal chains and feedback loops where accuracy below 1% is required. The MMSZ4682T1 achieves this specification across its qualified operating temperature range.

Does the MMSZ4682T1 meet automotive qualification standards?

The MMSZ4682T1 itself is not AEC-Q101 qualified; however, its automotive-grade counterpart SZMMSZ4682T1G is explicitly listed in the datasheet as AEC-Q101 qualified and PPAP capable. The MMSZ4682T1 shares identical electrical characteristics and SOD−123 packaging but lacks the automotive-specific process controls and traceability. For automotive applications, engineers should specify the SZ prefix variant.

What is the maximum reverse leakage current for the MMSZ4682T1 at 1 V bias?

The MMSZ4682T1 exhibits a maximum reverse leakage current (I_R) of 1 µA when biased at 1 V, as specified in the Electrical Characteristics table on page 3 of the onsemi datasheet. This low leakage ensures minimal error injection in high-impedance voltage divider networks and preserves battery life in always-on sensor nodes where the MMSZ4682T1 serves as a reference element.

Can the MMSZ4682T1 be used in place of the MMSZ4682T1G?

Yes-the MMSZ4682T1 and MMSZ4682T1G are electrically and mechanically identical; the "G" suffix denotes explicit Pb-free compliance marking per onsemi's packaging standard. Both share the same SOD−123 footprint, Zener parameters, thermal ratings, and ESD performance. The MMSZ4682T1 may be used interchangeably where RoHS documentation is not contractually mandated, though MMSZ4682T1G is preferred for new designs requiring full compliance traceability.

What is the thermal resistance from junction to lead (R_JL) for the MMSZ4682T1?

The MMSZ4682T1 has a thermal resistance from junction to lead (R_JL) of 150 °C/W, measured via infrared scan method per Note 2 in the Maximum Ratings table. This value enables accurate prediction of junction temperature rise when the device is soldered to standard PCB copper land patterns, supporting thermal design validation for continuous operation at up to 500 mW on FR-5 boards.