onsemi MMSZ5V6ET1

Overview

MMSZ5V6ET1 from onsemi is a 500 mW surface-mount Zener diode in SOD-123 package, providing precise 5.6 V ±5% reverse breakdown regulation at 5 mA test current, with dynamic impedance of 40 Ω and leakage current ≤1 µA at 4.8 V, widely used for voltage reference and overvoltage protection in power supply feedback loops.

For engineers reviewing the MMSZ5V6ET1 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal resistance (R_JL = 150 °C/W), peak surge capability (225 W), AEC-Q101 qualification, and Pb-free SOD-123 footprint compatibility with automated assembly.

Technical Context

This device operates as a two-terminal voltage reference by maintaining stable reverse conduction above its specified Zener voltage (5.32–5.88 V) with low dynamic impedance (40 Ω at I_ZT = 5 mA) and tight temperature coefficient (≈2 mV/°C near 5.6 V). It supports transient suppression via 225 W nonrepetitive 8 × 20 µs surge rating.

Designed for FR-4/FR-5 PCB mounting, it delivers 500 mW total power dissipation at T_L = 75 °C, derating linearly at 6.7 mW/°C above that point, with junction-to-lead thermal resistance of 150 °C/W enabling efficient heat transfer to the PCB trace.

Key Specifications

Pinout & Package

The MMSZ5V6ET1 is housed in a Pb-free SOD-123 plastic surface-mount package (Case 425, 1.60 × 2.69 × 1.16 mm), with cathode indicated by a polarity band. The package supports high-density placement and is optimized for reflow soldering at 260 °C for 10 seconds.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C5V6, MMSZ5V6ET1 offers superior thermal performance and automotive qualification; compared with MMSZ5V6ET1G, it shares identical functionality but reflects an earlier packaging nomenclature - both are electrically and mechanically compatible in SOD-123 layouts.

Availability

MMSZ5V6ET1 is available at Aetrix Electronics and suitable for switch-mode power supplies, microcontroller reset circuits, industrial sensor interfaces, and USB port protection requiring stable component supply and long-term obsolescence management.

Supply support for MMSZ5V6ET1 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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The MMSZxxxET1 series belongs to onsemi's precision Zener regulator portfolio, engineered for high-volume, space-constrained applications demanding tight voltage tolerance, low impedance, and AEC-Q101 reliability in compact SOD-123 packages.

FAQ

What is the Zener voltage tolerance of MMSZ5V6ET1?

The MMSZ5V6ET1 has a nominal Zener voltage of 5.6 V with a standard tolerance of ±5%, meaning the actual measured V_Z falls between 5.32 V and 5.88 V when tested at I_ZT = 5 mA and T_A = 25 °C. This tolerance is guaranteed across the full operating temperature range of −55 °C to +150 °C, as confirmed in the onsemi datasheet revision 8.

Is MMSZ5V6ET1 suitable for automotive applications?

Yes, MMSZ5V6ET1 is AEC-Q101 qualified and PPAP capable, making it suitable for automotive applications including body control modules, infotainment power rails, and sensor interface circuits. Its construction, testing, and traceability meet automotive quality system requirements, and it operates reliably across the extended temperature range required for under-hood and cabin environments.

What is the maximum power dissipation of MMSZ5V6ET1 on a standard PCB?

MMSZ5V6ET1 delivers 500 mW total power dissipation on FR-5 board at lead temperature (T_L) = 75 °C, derating linearly at 6.7 mW/°C above that point. At T_L = 100 °C, usable power drops to ~333 mW. This rating assumes the recommended onsemi footprint and adequate copper area for thermal conduction - not ambient temperature alone.

Does MMSZ5V6ET1 have Pb-free packaging?

Yes, MMSZ5V6ET1 uses a Pb-free SOD-123 package compliant with RoHS Directive 2011/65/EU. The "ET1" suffix denotes the Pb-free variant; onsemi also offers the functionally identical MMSZ5V6ET1G with explicit "G" marking for enhanced Pb-free traceability. Both versions share identical electrical, thermal, and mechanical specifications.

How does the dynamic impedance of MMSZ5V6ET1 affect circuit performance?

The MMSZ5V6ET1 exhibits a maximum dynamic impedance (Z_ZT) of 40 Ω at I_ZT = 5 mA, directly determining how much its output voltage shifts under changing load current. For example, a 1 mA change in Zener current causes ≤40 mV variation - critical for precision references in feedback networks or ADC references where stability below 0.1% is required.