Nexperia USA Inc. BZX84W-B13X

Overview

BZX84W-B13X from Nexperia is a ±2 % tolerance Zener voltage regulator diode rated at 13 V nominal working voltage, housed in an SOT323 (SC-70) surface-mount package with 3 terminals (anode, cathode, and not-connected pin), delivering 275 mW total power dissipation at 25 °C ambient and exhibiting 170 Ω differential resistance at 5 mA test current for stable regulation in low-power analog reference and supply rail clamping circuits.

For engineers reviewing the BZX84W-B13X datasheet, BZX84W-B13X pinout, BZX84W-B13X application, or BZX84W-B13X equivalent, this device serves as a precision 13 V shunt regulator in voltage reference, overvoltage protection, and biasing functions where tight tolerance, low capacitance (2.5 pF), and high-frequency stability are required.

Technical Context

This Zener diode operates in reverse breakdown to maintain a stable 13 V reference across its cathode–anode terminals under controlled current conditions (IZ = 5 mA), with a temperature coefficient of +9.4 mV/K ensuring predictable drift behavior over temperature. Its non-connected terminal (Pin 2) isolates internal structure without electrical function.

The device achieves 2.5 pF junction capacitance at 1 MHz and 0 V reverse bias, enabling use in high-frequency signal conditioning and RF decoupling applications; thermal resistance from junction to ambient is 455 K/W on standard FR4 PCB, limiting continuous power handling without heatsinking.

Key Specifications

Pinout & Package

Package: SOT323 (SC-70), leadless surface-mount plastic package with 3 terminals, 1.3 mm × 1.8 mm footprint, 0.65 mm pitch, and single-sided copper FR4 mounting per JEDEC standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5243B and BZX84-C13, the BZX84W-B13X delivers superior voltage accuracy (±2 % vs. ±5 %), lower junction capacitance (2.5 pF vs. ≥3.0 pF), and optimized differential resistance for precision analog referencing-making it the preferred choice where regulation stability and high-frequency performance are design-critical.

Availability

BZX84W-B13X is available at Aetrix Electronics and suitable for voltage reference design, overvoltage protection circuits, and RF bias stabilization requiring stable component supply, consistent parametric performance, and long-term obsolescence management.

Supply support for BZX84W-B13X 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 focused on high-volume, high-reliability logic, discrete, and MOSFET solutions, headquartered in Nijmegen, Netherlands, with manufacturing in Europe and Asia.

The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered for stable voltage regulation in compact, cost-sensitive consumer, industrial, and communications equipment where SMT scalability and parametric consistency are essential.

FAQ

What is the maximum continuous reverse current the BZX84W-B13X can sustain without degradation?

The device supports a maximum forward current of 200 mA per Absolute Maximum Ratings, but for Zener operation, continuous reverse current must be limited by power dissipation: at 13 V, sustained current must stay ≤21.2 mA to remain within the 275 mW total power limit at 25 °C ambient. Derating is required above 25 °C using the 455 K/W thermal resistance.

Does Pin 2 (n.c.) require PCB routing or grounding?

No-Pin 2 is internally not connected and must remain electrically floating on the PCB. Routing or grounding this terminal introduces unnecessary parasitic capacitance and may compromise high-frequency performance or cause unintended coupling; the recommended footprint follows Nexperia's SOT323 reflow land pattern with isolated pad.

How does the +9.4 mV/K temperature coefficient affect regulation accuracy over temperature?

At 13 V nominal, +9.4 mV/K means the Zener voltage increases by ~0.94 V over a 100 K rise (e.g., −40 °C to +60 °C), contributing ~7.2 % drift. Combined with ±2 % initial tolerance, total deviation remains within ±9.2 % across that range-acceptable for non-critical biasing but requires compensation in metrology-grade references.

Can BZX84W-B13X replace BZX84-C13 in existing designs?

Yes, mechanically and electrically compatible in SOT323 footprint, but BZX84W-B13X offers tighter ±2 % tolerance and lower 2.5 pF capacitance versus BZX84-C13's ±5 % and ~3.0 pF-yielding improved reference accuracy and high-frequency response. No layout change is needed, though system-level validation of regulation stability under worst-case temperature and current is recommended.