Nexperia USA Inc. BZX84W-C4V7F

Overview

BZX84W-C4V7F from Nexperia is a ±5 % tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 4.7 V nominal Zener voltage at 5 mA, 275 mW total power dissipation, and 3 µA reverse current at 2 V reverse bias. It serves as a precision reference or low-power voltage clamp in signal conditioning and power rail stabilization circuits.

For engineers reviewing the BZX84W-C4V7F datasheet, BZX84W-C4V7F pinout, BZX84W-C4V7F application, or BZX84W-C4V7F equivalent, this page delivers verified Zener parameters, terminal mapping, thermal resistance (455 K/W), differential resistance (80 Ω), and temperature coefficient (−1.4 mV/K) critical for low-drift biasing and ESD-protected regulation in compact SMT designs.

Technical Context

This Zener diode operates in reverse breakdown with a specified 4.7 V nominal Zener voltage at I_Z = 5 mA and exhibits a negative temperature coefficient of −1.4 mV/K, indicating decreasing Zener voltage with rising junction temperature. Its differential resistance of 80 Ω at 5 mA defines output impedance under regulation.

The device supports pulsed operation up to 40 W non-repetitive peak reverse power (t_p = 100 µs) and maintains stable regulation across −55 °C to +150 °C ambient range. Its 6 pF capacitance at 1 MHz and 0 V bias enables use in high-frequency decoupling and noise-sensitive analog references.

Key Specifications

Pinout & Package

SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals; dimensions per IEC JEDEC outline: 2.2 mm × 1.35 mm × 0.95 mm height; 0.65 mm pitch; tin-plated copper footprint compatible with reflow soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5225BS, BZX84W-C4V7F offers smaller footprint and lower r_diff but reduced power margin; versus BZX84-C4V7, it provides pin-identical SOT323 compatibility and improved thermal performance on FR4, making it optimal for space-constrained, thermally managed designs.

Availability

BZX84W-C4V7F is available at Aetrix Electronics and suitable for power supply reference, ESD protection clamp, and low-power voltage monitor applications requiring stable component supply, consistent parametric performance, and long-term SMT manufacturability.

Supply support for BZX84W-C4V7F 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, with leadership in automotive-qualified and standard SMT components.

The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered for compact, cost-effective voltage regulation and clamping in consumer, industrial, and communications equipment where space, thermal efficiency, and parametric consistency are critical.

FAQ

What is the maximum continuous reverse current the BZX84W-C4V7F can sustain without exceeding its power limit?

At 25 °C ambient and mounted on standard FR4 PCB, the BZX84W-C4V7F sustains up to 58.5 mA reverse current continuously (275 mW ÷ 4.7 V) before reaching its 275 mW total power dissipation limit. Derating applies above 25 °C per its 455 K/W thermal resistance.

Does the n.c. pin (Pin 2) require grounding or isolation on the PCB?

No. Pin 2 is internally not connected and must remain electrically floating-no trace, pad, or solder mask relief should be assigned to it. Connecting it risks mechanical stress or unintended coupling; Nexperia's recommended footprint excludes any copper at that location.

How does the −1.4 mV/K temperature coefficient affect regulation accuracy over temperature?

Over a −40 °C to +85 °C junction temperature range (ΔT = 125 K), the Zener voltage shifts by −175 mV (−1.4 mV/K × 125 K), resulting in a final V_Z of ~4.525 V at +85 °C. This drift is fully characterized and repeatable, enabling calibration in closed-loop systems.

Can BZX84W-C4V7F replace BZX84-C4V7 in existing SOT-23 designs?

No. Although electrically identical, BZX84W-C4V7F uses SOT323 (SC-70) with 0.65 mm pin pitch and a center n.c. pin, whereas BZX84-C4V7 uses SOT-23 with 0.95 mm pitch and functional 3-pin configuration. Mechanical incompatibility prevents direct substitution without PCB redesign.