Nexperia USA Inc. BZX58550-B3V0X

Overview

BZX58550-B3V0X from Nexperia is a low-current Zener voltage regulator diode in SOD523 (SC-79) package, designed for precision biasing and voltage reference in ultra-low-power circuits. It delivers a nominal 3.0 V regulation at 50 µA test current, with ±2 % tolerance, 600 Ω differential resistance at 5 mA, and 0.8 µA max reverse leakage at 2.4 V, enabling stable operation in portable battery-powered sensor nodes and wearables.

For engineers reviewing the BZX58550-B3V0X datasheet, BZX58550-B3V0X pinout, BZX58550-B3V0X application, or BZX58550-B3V0X equivalent, key selection criteria include its 3.0 V Zener voltage at 50 µA, ultra-small SOD523 footprint, 300 mW power rating on FR4 with 35 mm² copper, and intentional low-leakage design optimized for noise-sensitive analog front-ends and low-quiescent current regulators.

Technical Context

This device operates as a two-terminal shunt voltage reference, maintaining regulation by conducting reverse current when cathode-to-anode voltage exceeds 3.0 V ±2 %. Its 600 Ω dynamic impedance at 5 mA ensures minimal output voltage deviation under load variation, while the 0.9 V forward voltage at 10 mA supports bidirectional protection use cases.

Thermal resistance from junction to ambient is 350 K/W with 35 mm² copper at the cathode tab, permitting reliable operation up to 150 °C junction temperature. The SOD523 package's 1.2 mm × 0.8 mm × 0.6 mm body enables high-density PCB layouts without compromising thermal performance in space-constrained IoT edge devices.

Key Specifications

Pinout & Package

SOD523 (SC-79) plastic surface-mount package: 2-pin, 1.2 mm × 0.8 mm × 0.6 mm body, cathode marked by bar on top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX58550-C3V0, the BZX58550-B3V0X offers tighter tolerance and lower leakage for precision analog stages; versus MMSZ5226B, it trades surge capacity for 55 % smaller footprint and superior low-current regulation stability.

Availability

BZX58550-B3V0X is available at Aetrix Electronics and suitable for portable sensor biasing, low-power reference supplies, IoT node voltage clamping, and microcontroller reset circuits requiring stable component supply across high-mix, low-volume production runs.

Supply support for BZX58550-B3V0X 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 automotive-grade reliability.

The BZX58550 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for battery-constrained applications demanding ultra-low leakage, tight voltage tolerance, and minimal PCB real estate.

FAQ

What is the maximum reverse voltage that can be continuously applied to BZX58550-B3V0X without regulation?

The device is rated for continuous reverse voltage up to its nominal Zener voltage of 3.0 V ±2 %; applying more than 3.06 V will initiate regulation and shunt current. Absolute maximum reverse voltage is not specified separately-the limiting factor is power dissipation: at 3.06 V, sustained current must remain below ~98 mA to stay within 300 mW derated limit.

Can BZX58550-B3V0X be used in forward-biased configurations?

Yes-it functions as a standard silicon diode with 0.9 V forward voltage at 10 mA, making it suitable for polarity protection or ESD clamping in bidirectional signal lines. However, its forward characteristics are secondary; the datasheet specifies only maximum V_F, not full I-V curve, so use is limited to non-critical forward applications.

How does the SOD523 package affect thermal performance compared to SOD-323?

SOD523 has higher thermal resistance than SOD-323 due to smaller copper pad area-R_th(j-a) is 350 K/W (35 mm² Cu) versus ~250 K/W for SOD-323 under same conditions. This means BZX58550-B3V0X dissipates less power continuously unless enhanced with larger copper pours or thermal vias beneath the cathode pad.

Is BZX58550-B3V0X suitable for automotive applications?

No-this part is not AEC-Q200 qualified and lacks automotive-specific testing or qualification. Nexperia explicitly states in legal disclaimers that non-automotive qualified products are unsuitable for safety-critical systems; use requires full customer validation and assumes all risk for automotive deployment.