Nexperia USA Inc. NZX12B,133

Overview

NZX12B,133 from Nexperia is a single Zener diode in a hermetically sealed SOD27 (SC-40) glass package, designed for precision voltage regulation and reference functions at 12 V nominal Zener voltage (V_Z = 11.6–12.1 V at I_Z = 5 mA), with differential resistance ≤35 Ω, reverse current ≤8 µA, total power dissipation ≤500 mW, and junction temperature rating up to 175 °C - used in low-power analog reference circuits and overvoltage protection stages.

For engineers reviewing the NZX12B,133 datasheet, NZX12B,133 pinout, NZX12B,133 application, or NZX12B,133 equivalent, this device serves as a stable, low-leakage, axial-leaded Zener reference for industrial power supply feedback, sensor biasing, and voltage clamping where thermal stability and long-term reliability under ambient temperatures from −55 °C to +175 °C are required.

Technical Context

This Zener diode operates in reverse breakdown mode with a specified working voltage of 12 V (B-grade tolerance: ±5% at I_Z = 5 mA), exhibiting low dynamic impedance (r_dif ≤35 Ω) and minimal temperature coefficient (≈−2 mV/K near 12 V). Its hermetic glass package ensures stable electrical characteristics across wide temperature extremes.

The device complies with IEC 60134 absolute maximum ratings, supports continuous forward current up to 250 mA, and features thermal resistance from junction-to-ambient of 380 K/W on FR4 PCB without metallization pad - enabling reliable operation in non-heatsinked, space-constrained designs.

Key Specifications

Pinout & Package

Package: SOD27 (SC-40), hermetically sealed axial-leaded glass package with cathode band marking; leads spaced 25.4 mm minimum, body diameter ≤4.25 mm, length ≤25.4 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX55-C12 and 1N4742A, NZX12B,133 delivers superior long-term stability and hermetic reliability in harsh thermal cycles, while occupying minimal axial footprint - ideal for mission-critical industrial references where parameter drift must remain <0.1% over 10 years.

Availability

NZX12B,133 is available at Aetrix Electronics and suitable for industrial power supply feedback, sensor biasing reference, overvoltage clamp protection, and microcontroller reset circuit design requiring stable component supply with full traceability and long-lifecycle support.

Supply support for NZX12B,133 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

Nexperia is a global semiconductor expert delivering high-performance, reliable discrete, logic, and MOSFET solutions optimized for efficiency, size, and robustness in industrial, automotive, and consumer applications.

The NZX series targets general-purpose Zener regulation with hermetic reliability, offering 112 voltage grades from 2.1 V to 36 V in axial-glass packages for applications demanding long-term stability and wide temperature operation.

FAQ

What is the exact Zener voltage tolerance for NZX12B,133 at 5 mA test current?

The NZX12B grade specifies a nominal Zener voltage of 12 V with a tolerance of ±5%, corresponding to a measured range of 11.6 V to 12.1 V at I_Z = 5 mA and T_j = 25 °C, as confirmed in Table 8 of the official Nexperia datasheet Rev. 4.

Can NZX12B,133 be used in surface-mount designs?

No - NZX12B,133 uses the axial-leaded SOD27 (SC-40) glass package with 25.4 mm lead spacing and is intended for through-hole mounting only; it lacks solder pads or terminations compatible with reflow or wave soldering processes used in SMT assembly.

What is the maximum allowable reverse voltage before breakdown begins?

The rated reverse voltage (V_R) before significant conduction is 9.8 V, defined as the voltage at which reverse current remains ≤8 µA; operation above this value initiates controlled Zener breakdown, with full regulation established at V_Z ≥11.6 V under 5 mA bias.

How does thermal resistance affect power derating at elevated ambient temperatures?

With R_th(j-a) = 380 K/W, the junction temperature rises 380 K per watt dissipated; at 500 mW, ΔT = 190 K - so maximum ambient temperature before exceeding T_j = 175 °C is −15 °C unless heatsinking or airflow reduces effective R_th.