Taiwan Semiconductor Corporation MMSZ4701 RHG

Overview

MMSZ4701 RHG from Taiwan Semiconductor is a 500mW surface-mount Zener diode with a nominal zener voltage of 14 V (min 13.3 V, max 14.7 V), tested at 50 mA, designed for precision voltage regulation and overvoltage protection in compact PCB layouts. It operates across –55°C to +150°C junction temperature range and features SOD-123 package with matte tin-plated leads.

For engineers reviewing the MMSZ4701 RHG datasheet, MMSZ4701 RHG pinout, MMSZ4701 RHG application, or MMSZ4701 RHG equivalent, key selection criteria include zener voltage tolerance (±5% at 14 V), leakage current ≤1.0 μA at 10.6 V, thermal resistance (340°C/W), and RoHS/halogen-free compliance for industrial and consumer power management designs.

Technical Context

The MMSZ4701 RHG functions as a two-terminal voltage reference device operating in reverse breakdown mode, maintaining stable output voltage under varying load and input conditions. Its zener impedance is specified per curve data across bias points, and it exhibits low leakage (<1.0 μA) at VR = 10.6 V - critical for low-power standby circuits.

Designed for surface-mount assembly on standard FR-4 boards, the device uses a SOD-123 package with cathode band polarity marking and meets J-STD-020 moisture sensitivity level 1. Thermal derating begins above 25°C ambient, with full 500 mW dissipation only at TA ≤ 25°C per the power temperature curve.

Key Specifications

Pinout & Package

Package: SOD-123 - surface-mount plastic case with cathode band marking; dimensions 2.85 mm × 1.80 mm × 1.25 mm; weight ≈10.97 mg; UL 94V-0 rated molding compound.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C15LT1G and MMBZ5241BLT1G, the MMSZ4701 RHG delivers tighter voltage tolerance at 14 V, higher 500 mW power handling, and lower leakage - making it preferred for precision 12 V system rail monitoring and high-current shunt regulation where thermal margin matters.

Availability

MMSZ4701 RHG is available at Aetrix Electronics and suitable for power supply feedback, overvoltage protection, reference voltage sourcing, and battery monitoring applications requiring stable component supply and consistent parametric performance across production lots.

Supply support for MMSZ4701 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 MMSZ4678–MMSZ4716 series was developed to deliver high-precision, low-leakage Zener diodes in miniature SOD-123 packages for space-constrained voltage regulation and protection in modern power electronics.

FAQ

What is the nominal zener voltage of the MMSZ4701 RHG?

The MMSZ4701 RHG has a nominal zener voltage of 14 V, with a guaranteed range of 13.3 V to 14.7 V when tested at 50 mA. This voltage is specified at 25°C ambient and remains stable across its –55°C to +150°C operating junction temperature range. The MMSZ4701 RHG achieves this performance using silicon planar Zener technology in a SOD-123 package.

What is the maximum power dissipation rating for the MMSZ4701 RHG?

The MMSZ4701 RHG is rated for 500 mW steady-state power dissipation at 25°C ambient temperature when mounted on a 5 cm × 5 cm copper pad. Its thermal resistance is 340°C/W, so power must be derated linearly above 25°C - for example, to ~350 mW at 70°C ambient. Exceeding this limit risks thermal runaway and permanent degradation of the MMSZ4701 RHG.

Is the MMSZ4701 RHG RoHS and halogen-free compliant?

Yes, the MMSZ4701 RHG is fully RoHS compliant per EU Directive 2011/65/EU and halogen-free per IEC 61249-2-21. These compliance attributes are confirmed in the official Taiwan Semiconductor datasheet revision A2311 and apply to all units shipped with RHG tape-and-reel packaging. The MMSZ4701 RHG also meets J-STD-020 moisture sensitivity level 1.

What package type does the MMSZ4701 RHG use, and what are its key mechanical features?

The MMSZ4701 RHG uses the SOD-123 surface-mount package: 2.85 mm × 1.80 mm body size, 1.25 mm height, with matte tin-plated leads solderable per J-STD-002. Polarity is marked by a cathode band. The molding compound meets UL 94V-0 flammability rating, and the device weighs approximately 10.97 mg. These features make the MMSZ4701 RHG suitable for automated high-density assembly.

What is the leakage current specification for the MMSZ4701 RHG?

The MMSZ4701 RHG specifies a maximum leakage current of 1.0 μA at a reverse voltage (V_R) of 10.6 V and 25°C. This low leakage supports energy-efficient operation in always-on circuits such as battery monitors and sensor bias networks. The value is measured per the official Taiwan Semiconductor electrical specifications table and applies across the full operating temperature range.