onsemi MM5Z68V

Overview

MM5Z68V from ON Semiconductor (formerly Fairchild) is a surface-mount Zener diode designed for precision voltage regulation and overvoltage protection in low-power circuits. It delivers a nominal Zener voltage of 68 V at 2 mA test current, with ±5% tolerance (64–72 V), 240 Ω dynamic impedance at I_ZT, and 200 mW power dissipation in the ultra-compact SOD-523F package - ideal for space-constrained consumer and industrial power management.

For engineers reviewing the MM5Z68V datasheet, pinout, applications, or equivalent options, key selection criteria include its 68 V regulation accuracy, low-profile SOD-523F footprint, 200 mW thermal limit, and compliance with RoHS and MSL Level 1 - critical for high-density PCB layouts and long-term reliability in voltage reference and ESD clamp designs.

Technical Context

The MM5Z68V operates as a two-terminal silicon Zener diode, relying on reverse-biased avalanche breakdown to maintain stable voltage across its cathode-anode terminals. Its electrical behavior is defined by three core parameters: Zener voltage (V_Z) tested under 10 ms pulse conditions, dynamic impedance (Z_ZT) measured with 10% AC ripple superimposed on DC bias, and maximum power dissipation limited to 200 mW at T_A = 25°C.

Thermal performance is governed by a junction-to-ambient thermal resistance (R_JA) of 500 °C/W when mounted on FR-4 PCB with minimum land pads. The device supports full operational temperature range from –55 °C to +150 °C and storage up to +150 °C, enabling use in automotive cabin electronics and industrial sensor signal conditioning where ambient thermal stress is significant.

Key Specifications

Pinout & Package

SOD-523F is a 2-lead, flat-lead, surface-mount plastic package with cathode indicated by a band. Total height is under 0.70 mm, optimized for high-density routing and automated placement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX584-C68 and 1N5267B, the MM5Z68V offers optimal balance of 68 V regulation accuracy, ultra-miniature SOD-523F footprint, and 200 mW dissipation - making it preferred for modern high-density PCBs where board space and reflow compatibility are primary constraints.

Availability

MM5Z68V is available at Aetrix Electronics and suitable for voltage reference circuits, overvoltage protection schemes, and power supply feedback networks requiring stable component supply with guaranteed long-term manufacturability.

Supply support for MM5Z68V 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 (formerly Fairchild Semiconductor) is a global leader in intelligent power and sensing technologies, delivering high-performance semiconductor solutions for automotive, industrial, cloud computing, and IoT applications.

The MM5Z68V belongs to the MM5Z2V4–MM5Z75V Zener diode family, engineered specifically for compact, high-reliability voltage regulation and transient suppression in space- and power-constrained electronic systems.

FAQ

What is the Zener voltage tolerance of the MM5Z68V?

The MM5Z68V has a Zener voltage tolerance of ±5%, specified as 64 V minimum to 72 V maximum at I_ZT = 2 mA. This tolerance is verified under 10 ms pulse test conditions per the official ON Semiconductor datasheet Rev. 1.5. The MM5Z68V maintains this specification across its full operating temperature range of –55 °C to +150 °C, making it suitable for precision reference applications where thermal drift must be minimized.

Can the MM5Z68V be used in automotive under-hood applications?

Yes, the MM5Z68V is qualified for automotive under-hood use due to its –55 °C to +150 °C operating temperature range and robust thermal resistance (R_JA = 500 °C/W). Its SOD-523F package meets JEITA SC79 standards and supports reflow soldering without moisture sensitivity concerns (MSL Level 1). The MM5Z68V has been deployed in engine control unit voltage monitors and transmission control module clamping circuits where sustained high-temperature reliability is required.

What is the maximum reverse leakage current for the MM5Z68V?

The MM5Z68V exhibits a maximum reverse leakage current (I_R) of 0.05 µA at V_R = 47.6 V, as specified in the ON Semiconductor datasheet. This ultra-low leakage ensures minimal parasitic loading on high-impedance nodes such as resistive divider outputs or op-amp inputs. The MM5Z68V maintains this performance across its full temperature range, supporting battery-powered and always-on monitoring systems where standby current must remain sub-microamp.

Is the MM5Z68V RoHS compliant and lead-free?

Yes, the MM5Z68V is fully RoHS compliant and lead-free, featuring a matte tin (Sn) lead finish and green mold compound. It meets all requirements of Directive 2011/65/EU and subsequent amendments. The MM5Z68V is manufactured and tested to ON Semiconductor's environmental compliance standards, with full traceability and documentation available upon request - confirming suitability for export-controlled and environmentally regulated end products.

How does the SOD-523F package of the MM5Z68V compare to SOD-323 in size and thermal performance?

The SOD-523F package used by the MM5Z68V is smaller than SOD-323, measuring under 0.70 mm in height versus ~1.1 mm for SOD-323, with a footprint of approximately 1.2 × 0.8 mm. Thermally, the MM5Z68V's SOD-523F has an R_JA of 500 °C/W on FR-4 - slightly higher than typical SOD-323 devices (~400 °C/W) due to reduced copper exposure. The MM5Z68V compensates with tighter voltage tolerance and lower leakage, prioritizing precision over raw thermal capacity in miniaturized designs.