Nexperia USA Inc. BZX8850-C43YL

Overview

BZX8850-C43YL from Nexperia is a low-current Zener diode in SOD882 (DFN1006-2) package, designed for precision voltage regulation at 43 V nominal Zener voltage with ±5 % tolerance. It delivers 250 mW total power dissipation, operates at 50 µA test current, and exhibits 375 Ω differential resistance at 2 mA, enabling stable biasing in portable and low-power analog circuits.

For engineers reviewing the BZX8850-C43YL datasheet, BZX8850-C43YL pinout, BZX8850-C43YL application, or BZX8850-C43YL equivalent, this device serves as a compact, low-leakage voltage reference for battery-powered sensor interfaces, microcontroller reset circuits, and precision analog signal conditioning where minimal quiescent current and tight voltage stability are critical.

Technical Context

This Zener diode operates in reverse breakdown mode with a nominal V_Z of 43 V (min 40.85 V, max 45.15 V at I_Z = 2 mA), exhibiting a temperature coefficient of +0.05 mV/K and diode capacitance of 40 pF at 1 MHz and 0 V. Its low 50 µA test current enables operation in ultra-low-power bias networks without loading sensitive nodes.

The device uses a silicon planar Zener structure optimized for fast switching and reduced noise, with intentional minor leakage current enhancement per AN90031. Thermal resistance from junction to ambient is 500 K/W on FR4 PCB, supporting reliable operation up to 150 °C junction temperature.

Key Specifications

Pinout & Package

Package: SOD882 (DFN1006-2), leadless ultra-small surface-mount plastic package; dimensions 1.0 × 0.6 × 0.5 mm; cathode marked by bar on top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX8850-C43YL, BZX8850-B43 offers tighter voltage control at the expense of cost and process yield sensitivity, while MMSZ43ET1G trades miniaturization for robustness and lower dynamic impedance-making the C43YL optimal for ultra-low-power, size-critical applications where ±5 % tolerance is acceptable.

Availability

BZX8850-C43YL is available at Aetrix Electronics and suitable for portable sensor bias networks, microcontroller reset circuits, low-power analog signal clamping, and reference voltage generation requiring stable component supply with guaranteed long-term sourcing.

Supply support for BZX8850-C43YL 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 quality.

The BZX8850 series belongs to Nexperia's low-current Zener diode product line, engineered specifically for precision voltage regulation in battery-powered and space-constrained applications where minimal test current and ultra-small packaging are essential.

FAQ

What is the maximum reverse voltage that BZX8850-C43YL can safely clamp without damage?

The absolute maximum non-repetitive peak reverse power dissipation is 40 W for 100 µs square-wave pulses at T_j = 25 °C. Continuous reverse voltage must stay within the 40.85–45.15 V Zener range at rated current; exceeding 45.15 V risks thermal runaway unless current is strictly limited by series resistance to maintain P < 250 mW.

Can BZX8850-C43YL be used in place of a 43 V Zener diode with ±2 % tolerance?

No-it is rated at ±5 % tolerance (40.85–45.15 V), whereas ±2 % parts like BZX8850-B43 span 42.14–43.86 V. Substituting introduces up to 1.01 V additional voltage uncertainty, which may violate regulation margins in precision feedback loops or reset thresholds requiring tight hysteresis control.

How does the 50 µA test current affect circuit design compared to standard 5 mA Zeners?

Operating at 50 µA reduces bias network current by two orders of magnitude, enabling resistor values ≥1 MΩ in divider-based references. This minimizes loading on high-impedance sources like thermistor networks or capacitive sensors, but demands careful PCB layout to avoid leakage paths that could distort regulation at such low currents.

Is the SOD882 package compatible with standard reflow soldering profiles?

Yes-the DFN1006-2 footprint matches IPC-7351B standards, and Nexperia specifies compatibility with JEDEC J-STD-020D reflow profiles. Peak temperature must not exceed 260 °C for ≤30 seconds; solder paste volume and stencil aperture (0.3 mm thickness, 0.6 × 0.7 mm openings) are defined in Figure 10 of the datasheet to prevent tombstoning or voiding.