Nexperia USA Inc. BZV49-C43,115

Overview

BZV49-C43,115 from Nexperia is a medium-power Zener voltage regulator diode in SOT89 package, with nominal working voltage 43 V (min 40 V, max 46 V), differential resistance ≤150 Ω at 2 mA test current, and temperature coefficient +37.6 to +46.6 mV/K. It delivers stable reference voltage in power supply feedback loops and overvoltage protection circuits for industrial DC-DC converters.

For engineers reviewing the BZV49-C43,115 datasheet, BZV49-C43,115 pinout, BZV49-C43,115 application, or BZV49-C43,115 equivalent, this page provides verified electrical parameters, thermal resistance (R_th(j-tp) = 15 K/W), reverse current limits (I_R ≤ 0.05 μA at V_R = 30.1 V), and SOT89 terminal mapping for PCB layout and thermal design validation.

Technical Context

This Zener diode operates in reverse breakdown mode with tightly controlled V_Z tolerance (~±5% E24 range) and low dynamic impedance (rdif ≤ 150 Ω). Its thermal resistance from junction to tie-point is 15 K/W, enabling reliable operation up to T_j = 150 °C when mounted on ceramic substrate (2.5 cm²).

The device supports non-repetitive surge handling up to 40 W for 100 μs pulses and maintains <1 μA reverse leakage at 30.1 V, making it suitable for precision regulation where stability under transient load and ambient temperature variation is critical.

Key Specifications

Pinout & Package

Package: SOT89 (SC-62), plastic surface-mounted package with exposed collector pad for enhanced thermal conduction; 3 leads, footprint optimized for manual and automated assembly.

Key Features

Applications

Availability

BZV49-C43,115 is available at Aetrix Electronics and suitable for industrial power supply regulation, overvoltage protection circuits, and programmable reference sources requiring stable component supply and long-term obsolescence support.

Supply support for BZV49-C43,115 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 leader in discrete semiconductors, formed in 2017 from the former NXP Standard Products division, specializing in high-volume, high-reliability components for automotive, industrial, and computing applications.

The BZV49 series belongs to Nexperia's voltage regulator diode product line, engineered for precision shunt regulation in cost-sensitive, thermally constrained power systems where ±5% tolerance and 1 W dissipation meet mainstream industrial requirements.

FAQ

What is the maximum continuous reverse current the BZV49-C43,115 can sustain?

The BZV49-C43,115 has no specified maximum continuous reverse current rating; instead, its safe operating limit is defined by total power dissipation (1 W at 25 °C ambient). At nominal 43 V Zener voltage, this corresponds to ~23 mA continuous Zener current before thermal derating applies. Exceeding this requires PCB thermal design verification per R_th(j-a) = 125 K/W.

How does the temperature coefficient affect regulation accuracy over temperature?

The BZV49-C43,115 exhibits a positive temperature coefficient of +37.6 to +46.6 mV/K, meaning its Zener voltage increases linearly with junction temperature. Over a 100 °C rise (25 °C to 125 °C), V_Z shifts by +3.8 V to +4.7 V - a ~9% change - requiring system-level compensation if sub-1% accuracy is needed across full temperature range.

Can BZV49-C43,115 be used in place of through-hole Zeners like 1N4749A?

Yes, but with layout and thermal considerations: BZV49-C43,115 (SOT89) offers identical 43 V nominal voltage and ±5% tolerance as 1N4749A, but its 1 W rating assumes proper PCB copper thermal pad connection. Unlike through-hole parts, it lacks lead-frame heat sinking, so board-level thermal design must replicate the 2.5 cm² ceramic substrate condition referenced in the datasheet.

What is the significance of the dual-anode pin configuration (Pins 1 and 3)?

Pins 1 and 3 are internally connected anodes, not independent terminals. Pin 3 serves as a mechanical and thermal anchor - its large copper-exposed pad improves heat transfer to the PCB, while Pin 1 provides primary electrical connection. This dual-anode structure enhances reliability in high-power pulse applications by distributing thermal stress and reducing solder joint fatigue.