Nexperia USA Inc. BZV49-C3V9,115

Overview

BZV49-C3V9,115 from Nexperia is a 3.9 V ±5% Zener voltage regulator diode in SOT89 package, rated for 1 W total power dissipation, 40 W non-repetitive peak reverse power, and 3 μA reverse current at 3 V. It serves as a precision reference or shunt regulator in low-voltage power supply feedback loops and overvoltage protection circuits.

For engineers reviewing the BZV49-C3V9,115 datasheet, BZV49-C3V9,115 pinout, BZV49-C3V9,115 application, or BZV49-C3V9,115 equivalent, this page delivers verified electrical parameters, thermal resistance (R_th(j-tp) = 15 K/W), differential resistance (85–90 Ω), temperature coefficient (−3.5 to −2.5 mV/K), and SOT89 mechanical layout for immediate design integration.

Technical Context

This device operates as a silicon planar Zener diode with controlled avalanche breakdown at nominal 3.9 V, optimized for stable DC voltage regulation under varying load and temperature conditions. Its E24-series tolerance (±5%) and low dynamic impedance support tight output regulation in linear regulators and voltage monitor circuits.

Designed for surface-mount use on ceramic substrates (2.5 cm²), it leverages the SOT89's exposed collector pad for enhanced thermal transfer-critical for sustaining 1 W continuous dissipation without derating below T_amb = 25 °C. Junction temperature remains within safe limits (T_j ≤ 150 °C) even during 100 μs surge events up to 40 W.

Key Specifications

Pinout & Package

Package: SOT89 (SC-62), plastic surface-mounted package with exposed collector pad for thermal conduction; 3 leads, 4.6 mm × 2.6 mm footprint.

Key Features

Applications

Availability

BZV49-C3V9,115 is available at Aetrix Electronics and suitable for power supply feedback, overvoltage clamp, reference voltage source, and current source bias applications requiring stable component supply and consistent parametric performance across manufacturing lots.

Supply support for BZV49-C3V9,115 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, logic, and PowerMOS semiconductors, serving automotive, industrial, computing, consumer, and wearable markets with high-volume, high-reliability components.

The BZV49 series belongs to Nexperia's voltage regulator diode product line, engineered for robust shunt regulation in space-constrained SMD applications where thermal performance and parametric consistency are critical.

Equivalent & Alternatives

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

Compared with MMBZ4685,115 and BZX84-C3V9,115, the BZV49-C3V9,115 delivers superior thermal performance (R_th(j-tp) = 15 K/W vs. >300 K/W), higher continuous power (1 W vs. 0.3 W), and double the surge energy handling-making it the only choice for industrial-grade shunt regulation where reliability under thermal stress is mandatory.

FAQ

What is the maximum continuous reverse current the BZV49-C3V9,115 can sustain at 25 °C?

The device does not specify a maximum continuous reverse current independent of power dissipation. At 25 °C ambient, its 1 W total power limit restricts continuous Zener current to approximately 256 mA (I_Z = P_tot/V_Z ≈ 1 W / 3.9 V), assuming no additional forward-biased junction heating. Derating is required above 25 °C per R_th(j-a) = 125 K/W.

Can the BZV49-C3V9,115 be used in series or parallel configurations for higher voltage or current handling?

Series connection is feasible for higher reference voltages but requires matched tempcos and r_dif to avoid imbalance; parallel use is strongly discouraged due to thermal runaway risk-minor V_Z mismatches cause current hogging, especially under sustained load. Nexperia recommends single-device use per regulation node.

Does the SOT89 package require special PCB layout considerations for thermal management?

Yes-the exposed collector pad (Pin 3) must be soldered to ≥2.5 cm² of 1 oz copper on the top layer, thermally connected to inner-plane ground or power planes via ≥4 thermal vias (0.3 mm diameter). Failure to implement this reduces effective R_th(j-tp) from 15 K/W to >50 K/W, risking thermal shutdown at full 1 W load.

How does the −3.5 to −2.5 mV/K temperature coefficient impact long-term voltage stability?

This negative coefficient causes V_Z to decrease by ~0.3–0.4% over a 100 °C range (e.g., 3.9 V → 3.78 V from 25 °C to 125 °C). For applications demanding <0.1% drift, external compensation (e.g., series positive-tempco resistor) or calibration is required-unlike bandgap references, this Zener offers no intrinsic cancellation.