onsemi NZ9F11VST5G

Overview

NZ9F11VST5G from onsemi is a 250 mW, 11.0 V nominal Zener voltage regulator diode in SOD-923 package, with tight tolerance (10.76 V to 11.22 V at 5 mA), low body height (0.40 mm), and Class 3 ESD rating (>16 kV HBM), designed for precision voltage clamping in space-constrained portable electronics.

For engineers reviewing the NZ9F11VST5G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal resistance (500 °C/W), steady-state power derating above 25 °C, and AEC-Q101 qualification status for automotive-grade reliability validation.

Technical Context

This device operates as a two-terminal, unidirectional voltage reference diode, conducting in reverse breakdown to clamp or regulate voltage at its specified V_Z. It exhibits low dynamic impedance (30 Ω max at I_ZT = 5 mA) and minimal temperature coefficient (+5.4 mV/°C at 5 mA), enabling stable regulation across ambient temperatures from −65 °C to +150 °C.

Designed for surface-mount assembly on FR-4 PCBs, it supports reflow up to 260 °C and meets MSL 1 requirements. Its SOD-923 package features 100% matte tin lead finish, void-free thermosetting epoxy (UL 94 V-0), and polarity marking (cathode band) for automated optical inspection and orientation-sensitive placement.

Key Specifications

Pinout & Package

SOD-923 is a 2-pin surface-mount package with cathode marked by a polarity band. Body dimensions are 1.00 mm × 0.60 mm × 0.40 mm; mounting position is unrestricted.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX584C11LT1G and MMSZ5240BT1G, NZ9F11VST5G delivers tighter voltage tolerance in the smallest footprint with automotive-grade reliability-making it optimal for next-generation portable and vehicle-mounted electronics where board area and qualification rigor are decisive.

Availability

NZ9F11VST5G is available at Aetrix Electronics and suitable for smartphone power rail protection, USB-C port overvoltage clamp, and automotive cabin sensor reference requiring stable component supply and long-term lifecycle support.

Supply support for NZ9F11VST5G 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 silicon solutions for automotive, industrial, cloud, medical, and IoT applications.

NZ9F11VST5G belongs to the NZ9FxxxST5G series of miniature Zener regulators engineered specifically for high-density portable electronics and AEC-Q101-compliant automotive subsystems where ultra-small footprint and ESD robustness are mandatory.

FAQ

What is the exact Zener voltage range for NZ9F11VST5G at 5 mA test current?

The NZ9F11VST5G has a guaranteed Zener voltage range of 10.76 V to 11.22 V when tested at I_ZT = 5 mA and T_A = 25 °C, representing a ±2.2% tolerance around the nominal 11.0 V rating. This range is verified per onsemi's Electrical Characteristics table on page 3 of the official datasheet (Rev. 4, September 2025). The NZ9F11VST5G maintains this specification across its full operating temperature range.

Is NZ9F11VST5G qualified for automotive applications?

Yes, NZ9F11VST5G is AEC-Q101 qualified and PPAP capable, as confirmed in the "Specification Features" section of the onsemi datasheet. The "SZ" prefix variant (SZNZ9F11VST5G) explicitly denotes automotive-grade screening and control change requirements. While NZ9F11VST5G itself carries the standard prefix, its identical electrical and mechanical specifications-including thermal performance, ESD rating, and package construction-support deployment in automotive cabin modules such as sensor interfaces and infotainment power domains.

What is the maximum junction-to-ambient thermal resistance (R_JA) for NZ9F11VST5G?

The maximum junction-to-ambient thermal resistance (R_JA) for NZ9F11VST5G is 500 °C/W, measured on an FR-4 board per the datasheet's Maximum Ratings table. This value assumes standard minimum pad layout (FR-4) and defines the worst-case thermal gradient from die to ambient air. Engineers must apply the 2.0 mW/°C derating factor above 25 °C ambient to ensure safe operation of the NZ9F11VST5G within its 250 mW power limit.

Does NZ9F11VST5G have a polarity marking, and how is it oriented on the PCB?

Yes, NZ9F11VST5G uses Style 1 marking per the SOD-923 mechanical drawing: Pin 1 (cathode) is identified by a visible polarity band at one end of the package. When mounted on PCB with the band facing left, the left pad connects to cathode and the right pad to anode. This orientation is critical for correct reverse-bias operation-applying forward voltage will result in ~0.9 V drop, while reverse bias above 10.76 V triggers Zener conduction. The NZ9F11VST5G marking diagram is documented in the "Mechanical Case Outline" section (page 4) of the datasheet.

What is the reverse leakage current specification for NZ9F11VST5G at 8 V?

The reverse leakage current (I_R) for NZ9F11VST5G is specified as ≤0.1 μA at V_R = 8 V and T_A = 25 °C, per the Electrical Characteristics table on page 3 of the onsemi datasheet. This ultra-low leakage ensures minimal standby power draw in battery-critical applications such as wearables and remote sensors. The NZ9F11VST5G maintains this performance across its full storage temperature range (−65 °C to +150 °C), with leakage increasing predictably per exponential diode behavior at elevated temperatures.