Nexperia USA Inc. BZX84-C3V3/DG/B3,2

Overview

BZX84-C3V3/DG/B3,2 from Nexperia is a 3.3 V ±5 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, rated for 250 mW total power dissipation at 25 °C ambient, with 5 μA reverse current at 1 V and 600 Ω differential resistance at 5 mA test current - used for precision low-power voltage reference and overvoltage clamping in sensor biasing and microcontroller I/O protection circuits.

For engineers reviewing the BZX84-C3V3/DG/B3,2 datasheet, BZX84-C3V3/DG/B3,2 pinout, BZX84-C3V3/DG/B3,2 application, or BZX84-C3V3/DG/B3,2 equivalent, this page delivers verified Zener voltage, thermal resistance, reverse leakage, differential resistance, and cathode/anode terminal mapping - critical for analog reference design, ESD clamp validation, and PCB layout verification in space-constrained consumer and industrial control systems.

Technical Context

This device operates as a two-terminal silicon Zener diode, conducting in reverse breakdown at nominal 3.3 V with ±5 % tolerance (3.10 V to 3.50 V), exhibiting a temperature coefficient of −3.5 mV/K at 5 mA and 25 °C - enabling stable regulation across −55 °C to +150 °C ambient range. Its non-repetitive peak reverse power dissipation is 40 W for 100 μs pulses, supporting transient suppression in low-energy surge events.

The SOT23 package provides junction-to-ambient thermal resistance of 500 K/W (free air) and 330 K/W (junction-to-solder-point), with forward voltage ≤0.9 V at 10 mA - confirming suitability for low-drop bias networks where minimal forward conduction loss is required during active-state operation.

Key Specifications

Pinout & Package

SOT23 (TO-236AB) plastic surface-mounted package: 3-lead, 1.9 mm × 1.1 mm × 1.0 mm body, 0.95 mm lead pitch, tin-plated copper leads compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5226BS-7-F and BZX84-C3V3-TP, the BZX84-C3V3/DG/B3,2 offers identical voltage tolerance and differential resistance but lower total power rating - making it optimal for cost-driven, thermally benign applications where 250 mW headroom suffices and supply chain consistency with Nexperia's automotive-qualified variants (e.g., BZX84-C3V3-Q) is prioritized.

Availability

BZX84-C3V3/DG/B3,2 is available at Aetrix Electronics and suitable for microcontroller I/O protection, sensor bias reference, and USB interface voltage clamp applications requiring stable component supply, consistent parametric performance, and long-term obsolescence management.

Supply support for BZX84-C3V3/DG/B3,2 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 components and energy-efficient power solutions.

The BZX84 series belongs to Nexperia's general-purpose Zener diode product line, engineered for cost-effective voltage regulation and transient suppression in consumer, industrial, and communication equipment where SMT scalability and parametric consistency are essential.

FAQ

What is the maximum continuous reverse current this diode can handle at 3.3 V?

The BZX84-C3V3/DG/B3,2 is not rated for continuous reverse conduction at its Zener voltage. At V_Z = 3.3 V, the maximum continuous current is limited by thermal dissipation: I_Z(max) = P_tot/V_Z ≈ 75 mA at 25 °C ambient on FR4 PCB. Derating is required above 25 °C per R_th(j-a) = 500 K/W.

Can this part replace a 3.3 V TVS diode in ESD protection circuits?

No - the BZX84-C3V3/DG/B3,2 is a Zener regulator, not a TVS. It lacks the low dynamic impedance and fast clamping response (<1 ns) of dedicated TVS diodes like PESD3V3L1BA. Use only for low-energy, slow-rising overvoltages; for IEC 61000-4-2 compliance, pair with a dedicated TVS.

Is Pin 2 truly unconnected, or does it serve a mechanical function?

Pin 2 is electrically unconnected (n.c.) per Nexperia's official pinning diagram and internal die construction. It serves no electrical role and must remain floating on the PCB. Its presence is mechanical - providing structural symmetry and solder joint stability in the SOT23 leadframe, not functional connectivity.

How does the −3.5 mV/K temperature coefficient affect accuracy over −40 °C to +125 °C?

Over that range, ΔT = 165 K yields ΔV_Z ≈ −578 mV - meaning V_Z shifts from ~3.55 V at −40 °C to ~2.97 V at +125 °C. For applications needing <±2 % accuracy, this drift requires either temperature compensation or operation within a narrower ambient band (e.g., 0–70 °C).