onsemi MM5Z9V1T1

Overview

MM5Z9V1T1 from onsemi is a 9.1 V, 100 mW Zener voltage regulator diode in SOD−523 package, designed for precision voltage reference and overvoltage protection in space-constrained circuits. It delivers ±5% Zener voltage tolerance at 5 mA test current, exhibits 15 Ω dynamic impedance at I_ZT, and supports ESD robustness >16 kV (HBM). It is deployed in voltage clamping for USB interface protection and biasing in portable RF front-ends.

For engineers reviewing the MM5Z9V1T1 datasheet, pinout, applications, or equivalent options, key selection criteria include its 9.1 V nominal Zener voltage, 15 Ω Zener impedance at 5 mA, 0.2 µA leakage at 7.0 V reverse bias, −3.5 to +7.0 mV/°C temperature coefficient range, and SOD−523 footprint compatibility with high-density PCB layouts.

Technical Context

The MM5Z9V1T1 operates as a two-terminal silicon Zener diode, conducting in reverse breakdown to maintain stable voltage across its terminals under specified current conditions. Its electrical behavior is defined by V_Z = 8.5–9.6 V at I_ZT = 5 mA, Z_ZT = 15 Ω max, and Z_ZK = 160 Ω max at I_ZK = 1.0 mA.

Thermal performance is governed by a junction-to-ambient thermal resistance of ~400 °C/W on FR-5 board, enabling operation from −65 °C to +150 °C. The device uses 100% matte tin lead finish, meets MSL 1 reflow requirements (260 °C peak), and achieves Class 3 HBM ESD rating (>16 kV).

Key Specifications

Pinout & Package

SOD−523 surface-mount plastic package (Case 502), dimensions 1.20 mm × 0.80 mm × 0.70 mm (L × W × H), cathode marked with band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX584-C9V1 and MMSZ5240B, the MM5Z9V1T1 offers the smallest PCB footprint and highest density integration for portable electronics, trading off absolute leakage and power headroom for miniaturization-ideal where board area is constrained and 100 mW regulation suffices.

Availability

MM5Z9V1T1 is available at Aetrix Electronics and suitable for USB interface protection, RF amplifier biasing, and microcontroller reset circuitry requiring stable component supply, consistent parametric performance, and RoHS-compliant packaging.

Supply support for MM5Z9V1T1 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 focused on energy-efficient technologies for automotive, industrial, cloud, and IoT applications.

The MM5Z9V1T1 belongs to the MM5ZxxxT1 series of miniature Zener regulators, engineered specifically for space-constrained portable electronics requiring reliable voltage reference and transient suppression in ultra-thin form factors.

FAQ

What is the Zener voltage tolerance of the MM5Z9V1T1?

The MM5Z9V1T1 has a Zener voltage range of 8.5 V to 9.6 V at I_ZT = 5 mA, corresponding to a ±5% tolerance around the nominal 9.1 V value. This tolerance is guaranteed across manufacturing lots and validated per onsemi's production test flow. The MM5Z9V1T1 maintains this specification under ambient temperatures from −65 °C to +150 °C, with voltage drift bounded by its published temperature coefficient.

Can the MM5Z9V1T1 be used in place of a 9.1 V Zener in an existing SOD-523 design?

Yes-the MM5Z9V1T1 is a direct replacement for any 9.1 V Zener diode in SOD-523 package, including prior revisions of the same part number. Its pinout (cathode/anode), mechanical dimensions (1.20 mm × 0.80 mm × 0.70 mm), thermal profile (MSL 1, 260 °C reflow), and electrical specs (V_Z, Z_ZT, I_R) match the documented requirements for this package and voltage grade. No layout or firmware changes are needed when substituting the MM5Z9V1T1.

What is the maximum reverse leakage current for the MM5Z9V1T1 at 7.0 V?

The MM5Z9V1T1 specifies a maximum reverse leakage current of 0.2 µA at VR = 7.0 V and TA = 25 °C. This value is measured per the onsemi datasheet test condition and remains valid across the full operating temperature range. The low leakage ensures minimal loading on bias networks and preserves accuracy in high-impedance reference applications where the MM5Z9V1T1 is commonly deployed.

Does the MM5Z9V1T1 support lead-free reflow soldering?

Yes-the MM5Z9V1T1 features a 100% matte tin lead finish and is qualified for lead-free reflow up to 260 °C peak temperature, meeting IPC/JEDEC J-STD-020 MSL 1 requirements. Its thermosetting plastic body and void-free mold compound withstand repeated thermal cycling without delamination or parameter shift, making the MM5Z9V1T1 suitable for modern high-volume SMT assembly lines.

How does the temperature coefficient affect the MM5Z9V1T1 in precision reference designs?

The MM5Z9V1T1 exhibits a temperature coefficient ranging from −3.5 mV/°C to +7.0 mV/°C, meaning its Zener voltage may drift up to ±0.7 V over a 100 °C span. In precision reference designs, this requires either temperature compensation circuitry or selection of operating points where the TC crosses zero. For non-critical biasing-such as in RF amplifier stages-the MM5Z9V1T1's TC is sufficiently stable to maintain functional performance without additional compensation.