Taiwan Semiconductor Corporation MMSZ4680 RHG

Overview

MMSZ4680 RHG from Taiwan Semiconductor is a 500mW surface-mount Zener diode with a nominal zener voltage of 2.2V (min 2.09V, max 2.31V), tested at 50mA, leakage current ≤4.0μA at 1.0V reverse bias, and SOD-123 package. It provides precise low-voltage regulation in space-constrained power rails and protection circuits.

For engineers reviewing the MMSZ4680 RHG datasheet, MMSZ4680 RHG pinout, MMSZ4680 RHG application, or MMSZ4680 RHG equivalent, key selection criteria include its 2.2V zener tolerance (±5%), 340°C/W junction-to-ambient thermal resistance on 5cm×5cm Cu pad, moisture sensitivity level 1 compliance, and RoHS/halogen-free construction.

Technical Context

The MMSZ4680 RHG operates as a two-terminal voltage reference device, maintaining stable 2.2V regulation under reverse-biased conditions with 50mA test current. Its zener impedance is optimized for low-voltage stabilization in low-power analog and digital supply monitoring.

Designed for surface-mount assembly, it features matte tin-plated leads compliant with J-STD-002, cathode band polarity marking, and UL 94V-0 molded compound. Junction temperature range spans −55°C to +150°C, supporting industrial ambient operation.

Key Specifications

Pinout & Package

Package: SOD-123 - compact 2.85 mm × 1.80 mm surface-mount plastic case with cathode band marking and matte tin-plated leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX584C2V2 and MMBZ5222BS, the MMSZ4680 RHG offers superior 500mW power handling and lowest leakage (4.0μA) in the 2.2V class, making it optimal for industrial regulation where thermal margin and precision outweigh footprint constraints.

Availability

MMSZ4680 RHG is available at Aetrix Electronics and suitable for low-voltage regulation, ESD protection, and sensor biasing applications requiring stable component supply and long-term industrial lifecycle support.

Supply support for MMSZ4680 RHG 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

Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete devices, analog ICs, and power management solutions for industrial, computing, and consumer markets.

The MMSZ4680 RHG belongs to TSC's MMSZ4678–MMSZ4716 Zener diode family, engineered for high-volume, cost-effective surface-mount voltage regulation and protection in space-constrained PCB designs.

FAQ

What is the nominal zener voltage and tolerance of the MMSZ4680 RHG?

The MMSZ4680 RHG has a nominal zener voltage of 2.2V with a tolerance of ±5%, specified as 2.09V (min) to 2.31V (max) at 50mA test current. This tight tolerance supports accurate voltage reference design in low-voltage microcontroller reset and sensor biasing circuits where regulation stability is critical.

What package type and mounting method does the MMSZ4680 RHG use?

The MMSZ4680 RHG uses the SOD-123 surface-mount package, featuring matte tin-plated leads compliant with J-STD-002 solderability standards. It is designed for reflow soldering on PCBs with a cathode band for polarity identification and requires no baking prior to assembly due to its J-STD-020 Level 1 moisture sensitivity rating.

What is the maximum power dissipation and thermal resistance of the MMSZ4680 RHG?

The MMSZ4680 RHG has a maximum steady-state power dissipation of 500mW and a junction-to-ambient thermal resistance of 340°C/W when mounted on a 5cm × 5cm copper pad. These values define its safe operating area and require appropriate PCB copper area allocation to maintain junction temperature within −55°C to +150°C limits.

How does the leakage current of the MMSZ4680 RHG compare to similar 2.2V Zener diodes?

The MMSZ4680 RHG exhibits ≤4.0μA leakage current at 1.0V reverse bias, which is lower than alternatives like MMBZ5222BS (10μA). This reduced leakage improves accuracy in low-current bias networks and extends battery life in always-on IoT sensor nodes where the MMSZ4680 RHG serves as a stable 2.2V reference.

Is the MMSZ4680 RHG compliant with environmental and safety standards?

Yes, the MMSZ4680 RHG is RoHS compliant and halogen-free, meeting global environmental directives. Its SOD-123 molding compound achieves UL 94V-0 flammability rating, and its construction supports lead-free reflow processes-making it suitable for consumer, industrial, and automotive electronics requiring certified material compliance.