onsemi MM5Z56VT1

Overview

MM5Z56VT1 from onsemi is a 56 V, 100 mW Zener diode in SOD−523 package, designed for precision voltage regulation and overvoltage protection in space-constrained circuits. It delivers nominal Zener voltage of 56 V at 1 mA test current, with ±4 V tolerance (52–60 V), 200 Ω maximum impedance at I_ZT, and 40 pF capacitance at 0 V - used in power rail clamping for portable electronics.

For engineers reviewing the MM5Z56VT1 datasheet, pinout, applications, or equivalent options, key selection criteria include its 56 V regulation point, 100 mW power rating, SOD−523 footprint compatibility, Class 3 ESD robustness (>16 kV HBM), and low leakage (<50 nA at 44.8 V).

Technical Context

The MM5Z56VT1 operates as a two-terminal voltage reference device, conducting in reverse breakdown to clamp or regulate voltage across sensitive nodes. Its thermal coefficient of +0.05 mV/°C ensures stable regulation over −65 °C to +150 °C junction temperature range.

Designed for surface-mount use on FR-4 PCBs, it supports reflow up to 260 °C and meets MSL 1 requirements. The SOD−523 package enables high-density placement while maintaining 100 mW steady-state dissipation at 25 °C ambient.

Key Specifications

Pinout & Package

SOD−523 package: 2-pin surface-mount plastic case with cathode band marking; body dimensions 1.20 mm × 0.80 mm × 0.70 mm; matte tin lead finish; qualified for 260 °C reflow.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX584-C56 and MMSZ5256B, the MM5Z56VT1 offers the smallest PCB footprint and lowest profile among 56 V Zeners, making it optimal for handheld medical devices and next-gen USB-C accessories where volume and height are constrained - though its 100 mW rating requires careful thermal design in sustained overload conditions.

Availability

MM5Z56VT1 is available at Aetrix Electronics and suitable for USB Power Delivery systems, automotive body electronics, industrial sensor modules, and portable medical equipment requiring stable component supply and consistent SOD−523 packaging.

Supply support for MM5Z56VT1 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 (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The MM5Z series was developed specifically for miniaturized voltage regulation in portable and high-density electronics, emphasizing ultra-small form factor, high ESD resilience, and tight parametric control in the 2.4–75 V Zener range.

FAQ

What is the Zener voltage tolerance of MM5Z56VT1?

The MM5Z56VT1 has a specified Zener voltage range of 52 V to 60 V at I_ZT = 1 mA, corresponding to a ±4 V absolute tolerance around the nominal 56 V rating. This tolerance is guaranteed per the onsemi datasheet revision 2 (July 2004) and applies under standard test conditions at 25 °C ambient temperature. The MM5Z56VT1 does not specify a percentage tolerance; its specification is defined strictly by these min/max voltage limits.

Can MM5Z56VT1 be used in place of a 56 V Zener in an existing SOD−523 design?

Yes - the MM5Z56VT1 is a direct fit for any SOD−523 footprint requiring a 56 V Zener regulator. Its pinout (cathode/anode), mechanical dimensions (1.20 × 0.80 × 0.70 mm), and soldering profile (MSL 1, 260 °C reflow) match industry-standard SOD−523 implementation guidelines. The MM5Z56VT1 maintains identical mounting position flexibility and thermal performance as other devices in the MM5Z series, ensuring drop-in compatibility in validated layouts.

What is the maximum reverse leakage current for MM5Z56VT1?

The MM5Z56VT1 exhibits a maximum reverse leakage current (I_R) of 50 nA when biased at 44.8 V (80 % of nominal V_Z). This value is measured at T_A = 25 °C and is guaranteed per the Electrical Characteristics table on page 3 of the official datasheet. At lower voltages such as 30 V, leakage drops further - typically below 1 nA - making the MM5Z56VT1 suitable for ultra-low-power monitoring circuits.

Does MM5Z56VT1 support automotive-grade temperature operation?

Yes - the MM5Z56VT1 is rated for junction and storage temperatures from −65 °C to +150 °C, exceeding AEC-Q200 Grade 3 (−40 °C to +125 °C) requirements. While not officially AEC-Q200 certified, its thermal specification and construction (void-free epoxy, UL 94 V−0 compliant) support deployment in automotive body control modules and infotainment power rails where ambient temperatures remain within −40 °C to +105 °C. The MM5Z56VT1's +0.05 mV/°C tempco further enhances stability in this range.

How does the Zener impedance of MM5Z56VT1 affect circuit performance?

The MM5Z56VT1 has a maximum Zener impedance (Z_ZT) of 200 Ω at I_ZT = 1 mA, which directly determines how tightly it regulates voltage under varying load currents. Lower Z_ZT yields smaller output voltage deviation during current transients - for example, a 10 mA step change causes ≤2 V shift. This makes the MM5Z56VT1 appropriate for moderate-precision clamping, though not for high-stability reference applications where Z_ZT < 50 Ω is required.