Nexperia USA Inc. BZX8850-B3V9YL

Overview

BZX8850-B3V9YL from Nexperia is a low-current Zener diode in SOD882 (DFN1006-2) package, designed for precision voltage regulation at 3.9 V nominal with ±2 % tolerance. It delivers stable reference voltage at 50 μA test current, features 250 mW total power dissipation, and exhibits 150 Ω differential resistance at 5 mA, enabling use in battery-powered sensor biasing and low-power analog signal conditioning.

For engineers reviewing the BZX8850-B3V9YL datasheet, BZX8850-B3V9YL pinout, BZX8850-B3V9YL application, or BZX8850-B3V9YL equivalent, this page provides verified electrical parameters, thermal limits, SOD882 footprint details, and direct substitution guidance for low-current Zener-based reference design.

Technical Context

This Zener diode operates in reverse breakdown to maintain a stable 3.9 V reference under low bias conditions. Its specified test current of 50 μA enables ultra-low quiescent current operation, while its ±2 % tolerance ensures tight voltage accuracy for precision analog circuits.

The device uses silicon planar technology with controlled doping to achieve predictable temperature coefficient (−2.7 mV/K) and low capacitance (150 pF at 0 V). Its SOD882 package supports high-density PCB layouts and reflow-compatible assembly without lead-induced parasitics.

Key Specifications

Pinout & Package

SOD882 (DFN1006-2) is a 2-terminal, leadless surface-mount package measuring 1.0 × 0.6 × 0.5 mm, with cathode indicated by a marking bar on the top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX8850-B3V9YL, BZX84-C3V9 trades accuracy for package robustness and cost, while MMSZ4685 offers better regulation slope at the expense of size and tolerance-making BZX8850-B3V9YL optimal for space-constrained, battery-powered systems demanding ±2 % reference stability.

Availability

BZX8850-B3V9YL is available at Aetrix Electronics and suitable for portable sensor biasing, low-power ADC reference, and IoT node voltage clamp applications requiring stable component supply, consistent parametric performance, and long-term obsolescence management.

Supply support for BZX8850-B3V9YL 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 discrete and logic devices, headquartered in Nijmegen, Netherlands.

The BZX8850 series belongs to Nexperia's precision Zener diode product line, engineered specifically for low-current voltage regulation in space-constrained, energy-efficient applications such as wearables, IoT endpoints, and portable instrumentation.

FAQ

What is the maximum continuous reverse current the BZX8850-B3V9YL can sustain?

The device is rated for a maximum forward current of 200 mA, but as a Zener diode, its continuous reverse (breakdown) current is limited by power dissipation. At 25 °C ambient on standard FR4 PCB, it sustains up to 64 mA continuously (250 mW ÷ 3.9 V) before exceeding thermal limits. Derating applies above 25 °C per the 500 K/W thermal resistance specification.

Does the BZX8850-B3V9YL require a series resistor in typical Zener regulation circuits?

Yes-a series current-limiting resistor is mandatory to prevent thermal runaway. For example, with a 5 V supply and 3.9 V Zener voltage, a 1.8 kΩ resistor limits current to ~610 μA, keeping power below 2.4 mW and ensuring stable operation well within the 250 mW rating and 50 μA test condition envelope.

How does the −2.7 mV/K temperature coefficient affect circuit performance?

This negative coefficient means the Zener voltage decreases by 2.7 mV per °C rise in junction temperature. Over a 50 °C operating range (25–75 °C), output shifts by −135 mV (−3.5 %), which must be compensated in high-accuracy references via external circuitry or calibration-unlike zero-TC Zeners used in metrology-grade designs.

Can the BZX8850-B3V9YL be used in place of a BZX84-C3V9 in an existing design?

Only with layout and performance review: BZX8850-B3V9YL has 40 % smaller footprint (SOD882 vs. SOT23), tighter ±2 % tolerance, and lower 250 mW power rating. If the original design relies on >250 mW dissipation or lacks pad adaptation for DFN1006-2, mechanical and thermal redesign is required-though electrical behavior at low currents improves.