onsemi MMSZ5224BT1

Overview

MMSZ5224BT1 from ON Semiconductor is a 5% tolerance, 2.8 V nominal Zener diode in SOD−123 surface-mount package, rated for 500 mW power dissipation on FR−5 board at 75°C, with 1400 Ω maximum dynamic impedance at 20 mA test current and 0.25 µA reverse leakage at 75 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog sensing and regulator feedback paths.

For engineers reviewing the MMSZ5224BT1 datasheet, pinout, applications, or equivalent options, this device is selected for stable 2.8 V regulation in space-constrained PCBs where thermal equilibrium Zener voltage accuracy, ESD robustness (>16 kV HBM), and Pb−free compliance are required.

Technical Context

This Zener diode operates with junction-in-thermal-equilibrium voltage specification (TL = 30°C ±1°C), ensuring stable 2.8 V nominal output across temperature when mounted per recommended footprint. Its 1400 Ω dynamic impedance at IZT = 20 mA and 1300 Ω at IZK = 30 mA defines regulation stiffness under varying load conditions.

The device exhibits a typical temperature coefficient near 0 mV/°C for its 2.8 V rating, confirmed in Figure 1 of the datasheet, and maintains ≤0.25 µA leakage up to VR = 75 V - critical for low-current bias networks and high-impedance voltage monitoring circuits.

Key Specifications

Pinout & Package

SOD−123 plastic surface-mount package (Case 425, Style 1), 1.40–1.80 mm width, 2.54–2.84 mm length, 0.94–1.35 mm height, cathode indicated by polarity band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C2V7 and MMSZ4686T1G, the MMSZ5224BT1 uniquely delivers 2.8 V ±5% regulation in the SOD−123 package with 500 mW capability - making it optimal for space-limited, medium-power 2.8 V reference and clamp functions where thermal equilibrium accuracy matters.

Availability

MMSZ5224BT1 is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB-C VCONN protection, automotive cabin controls, and medical wearable battery monitoring requiring stable component supply and Pb−free compliance.

Supply support for MMSZ5224BT1 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

ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.

The MMSZ52xxxT1G series is designed for general-purpose, medium-current Zener regulation in high-density surface-mount applications - prioritizing thermal stability, automated assembly compatibility, and AEC−Q101 readiness for harsh-environment deployment.

FAQ

What is the exact Zener voltage tolerance and test condition for MMSZ5224BT1?

The MMSZ5224BT1 has a ±5% tolerance on its 2.8 V nominal Zener voltage, specified as 2.66 V (min) to 2.94 V (max). This tolerance is guaranteed at IZT = 20 mA with the device junction held in thermal equilibrium at TL = 30°C ±1°C - not under self-heating conditions. The MMSZ5224BT1 datasheet confirms this in Table 1 on page 3.

Does MMSZ5224BT1 support automotive-grade qualification?

Yes - the SZMMSZ5224BT1G variant is AEC−Q101 qualified and PPAP capable, with unique site and process controls for automotive applications. The standard MMSZ5224BT1 is not automotive-qualified, but shares identical electrical specs and SOD−123 packaging. Both use Pb−free construction and meet Class 3 ESD requirements (>16 kV HBM).

What is the maximum reverse voltage MMSZ5224BT1 can withstand before significant leakage occurs?

The MMSZ5224BT1 guarantees ≤0.25 µA reverse leakage current at VR = 75 V, per the Electrical Characteristics table on page 3. Beyond 75 V, leakage rises nonlinearly - Figure 8 shows typical IR reaches ~1 µA at 85 V and ~10 µA at 100 V at 25°C. For reliable clamping, operation should remain within the 75 V limit.

How does thermal derating affect MMSZ5224BT1's usable power at 105°C ambient?

At TA = 105°C, the MMSZ5224BT1's usable power is derated from 500 mW using the 6.7 mW/°C slope above TL = 75°C. From 75°C to 105°C is a 30°C rise, reducing power by 201 mW (30 × 6.7), leaving 299 mW maximum dissipation. This assumes FR−5 board mounting with minimum recommended footprint per datasheet Figure 3.

Can MMSZ5224BT1 be used in place of a 2.7 V Zener like BZX84-C2V7?

No - the MMSZ5224BT1 is not a direct replacement for BZX84-C2V7 due to differing nominal voltages (2.8 V vs. 2.7 V), package (SOD−123 vs. SOT-23), and power rating (500 mW vs. 300 mW). While both are ±5% Zeners, the 0.1 V offset and 200 mW higher dissipation alter regulation accuracy and thermal behavior. Circuit validation is required before substitution.