Nexperia USA Inc. NZX4V3B,133

Overview

NZX4V3B,133 from Nexperia is a single Zener diode in a hermetically sealed SOD27 (SC-40) glass package, designed for precision voltage regulation at 4.3 V nominal Zener voltage with ±5% tolerance. It delivers 5 mA test current, 100 Ω typical differential resistance, and ≤3 µA reverse leakage at 1 V, supporting stable reference generation in low-power analog circuits and power supply feedback paths.

For engineers reviewing the NZX4V3B,133 datasheet, NZX4V3B,133 pinout, NZX4V3B,133 application, or NZX4V3B,133 equivalent, key selection criteria include Zener voltage accuracy at I_Z = 5 mA, thermal resistance (R_th(j-a) = 380 K/W), axial-leaded SOD27 mechanical compatibility, and compliance with IEC 60134 absolute maximum ratings.

Technical Context

This device operates as a two-terminal shunt voltage regulator, maintaining a stable 4.3 V reference across its cathode-anode terminals under reverse bias. Its low 100 Ω differential resistance ensures minimal voltage deviation over ±1 mA current variation at 5 mA nominal Zener current.

The SOD27 package provides hermetic glass sealing for long-term stability and moisture resistance, while its axial lead configuration supports through-hole PCB mounting with 8 mm max lead length per thermal characterization. Junction temperature range spans −55 °C to +175 °C, enabling operation in industrial ambient conditions up to +175 °C.

Key Specifications

Pinout & Package

The NZX4V3B,133 uses a 2-pin axial-leaded SOD27 (SC-40) hermetically sealed glass package. The cathode is marked by a band on the glass body; leads are untrimmed and suitable for manual or wave soldering with ≤8 mm lead length per thermal spec.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX55-C4V3 and 1N4730A, NZX4V3B,133 offers superior long-term stability via hermetic sealing and matches 4.3 V regulation precisely-critical where calibration drift or humidity-induced failure must be avoided.

Availability

NZX4X3B,133 is available at Aetrix Electronics and suitable for industrial power supplies, sensor interface modules, and embedded control systems requiring stable component supply with guaranteed long-lifecycle support.

Supply support for NZX4V3B,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 devices with focus on efficiency, miniaturization, and robustness.

The NZX series targets general-purpose Zener regulation in space-constrained, thermally demanding applications-designed for stability, repeatability, and manufacturability in high-volume industrial and consumer electronics.

FAQ

What is the maximum continuous reverse current the NZX4V3B,133 can handle without exceeding its 500 mW power limit?

At 4.3 V Zener voltage, the maximum continuous reverse current is 116 mA (500 mW ÷ 4.3 V). This assumes T_amb ≤ 25 °C and no additional thermal resistance beyond the specified 380 K/W R_th(j-a). Derating is required above 25 °C ambient per the thermal resistance curve.

How does the SOD27 package affect PCB layout and thermal performance compared to DO-35?

SOD27 has identical axial lead geometry to DO-35 but uses hermetic glass instead of plastic, resulting in identical footprint and hole spacing. Its R_th(j-a) of 380 K/W matches typical DO-35 values, but the glass seal eliminates moisture-related parameter shift-critical for high-reliability layouts in non-hermetic enclosures.

Can NZX4V3B,133 be used in series or parallel configurations for higher voltage or current capability?

No-Zener diodes must not be paralleled due to mismatched V_Z causing current hogging. Series connection is possible but requires individual current limiting resistors per diode; total voltage equals sum of individual V_Z values, with worst-case tolerance stacking (±10% for two units).

Is the 4.3 V Zener voltage specified at DC or pulsed conditions, and how does temperature affect it?

V_Z = 4.1–4.3 V is specified at DC I_Z = 5 mA and T_j = 25 °C. Temperature coefficient is approximately −2 mV/K near 4.3 V (per Fig 3), meaning V_Z decreases ~0.2 V over a 100 °C junction rise-designs requiring tight regulation must include thermal management or compensation.