Nexperia USA Inc. BZV49-C20,115

Overview

BZV49-C20,115 from Nexperia is a medium-power Zener voltage regulator diode in SOT89 package, designed for precision DC voltage reference and stabilization in power supply rails. It delivers a nominal working voltage of 20 V (min 18.8 V, max 21.2 V) at 5 mA test current, with differential resistance ≤55 Ω, ±5% tolerance, and 1 W total power dissipation - deployed in industrial power management and embedded voltage monitoring circuits.

For engineers reviewing the BZV49-C20,115 datasheet, BZV49-C20,115 pinout, BZV49-C20,115 application, or BZV49-C20,115 equivalent, key selection criteria include Zener voltage accuracy at I_Z = 5 mA, thermal resistance (R_th(j-tp) = 15 K/W), non-repetitive peak reverse power capability (40 W), and SOT89 thermal pad layout compatibility with PCB copper pour design.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable output voltage under varying load and input conditions. Its temperature coefficient of +14.4 to +16.4 mV/K (typical at 5 mA) enables predictable drift compensation in mid-voltage regulation stages.

The device uses silicon planar technology with a three-terminal SOT89 configuration (anode–cathode–anode), where Pin 3 serves as an auxiliary anode connection to enhance thermal conduction via the exposed collector pad - critical for sustained 1 W dissipation on ceramic substrates.

Key Specifications

Pinout & Package

Package: SOT89 (SC-62), plastic surface-mounted package with exposed collector pad for enhanced heat transfer; 3 leads; footprint compatible with JEDEC TO-243 outline.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMSZ4702T1G and BZX84-C20, BZV49-C20,115 uniquely supports 1 W continuous operation with SOT89 thermal pad integration - making it the sole option among the three for industrial-grade 20 V shunt regulation requiring long-term thermal reliability.

Availability

BZV49-C20,115 is available at Aetrix Electronics and suitable for industrial power supply regulation, microcontroller reference voltage stabilization, and automotive body control module clamping requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for BZV49-C20,115 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, specializing in high-volume, high-reliability components for automotive, industrial, and consumer electronics markets.

The BZV49 series belongs to Nexperia's voltage regulator diode product line, engineered specifically for robust, medium-power shunt regulation in space-constrained SMD applications where thermal performance and ±5% E24 standardization are critical.

FAQ

What is the maximum continuous reverse current the BZV49-C20,115 can sustain at 25 °C?

The BZV49-C20,115 is rated for continuous Zener current up to 250 mA at 25 °C ambient, but practical operation is limited by power dissipation: at 20 V, this yields 5 W - far exceeding its 1 W P_tot rating. Therefore, maximum sustainable I_Z is ~50 mA (20 V × 50 mA = 1 W), assuming ideal heatsinking. Derating is required above 25 °C per R_th(j-a) = 125 K/W.

Does the SOT89 package require special PCB layout considerations?

Yes - Pin 3 is an electrically isolated thermal pad tied to the internal anode structure. It must be soldered to a minimum 25 mm² copper pour (2.5 cm² ceramic substrate per datasheet) to achieve the specified R_th(j-tp) = 15 K/W. Failure to connect Pin 3 reduces thermal performance by >80%, risking premature thermal runaway at >0.3 W.

How does the temperature coefficient affect regulation accuracy over −40 °C to +125 °C?

At I_Z = 5 mA, the BZV49-C20,115 exhibits a typical temperature coefficient of +15.4 mV/K. Over a 165 °C span, this produces ~2.54 V drift - meaning regulation shifts from ~19.2 V at −40 °C to ~21.7 V at +125 °C. For precision applications, this drift must be compensated via circuit design or selected alongside complementary tempcos.

Can BZV49-C20,115 replace the 1N4744A in existing through-hole designs?

No - while both regulate at 20 V, the BZV49-C20,115 is SMT-only (SOT89) and requires rework of footprint, thermal pad layout, and solder profile. Electrically, it offers superior thermal resistance (15 K/W vs. ~60 K/W for 1N4744A in TO-204AA), but mechanical incompatibility prevents drop-in substitution without PCB revision and validation.