Nexperia USA Inc. BZX84-B47,215

Overview

BZX84-B47,215 from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, rated for 47 V nominal breakdown voltage at I_Z = 2 mA, with 250 mW total power dissipation and 40 W non-repetitive peak reverse power capability. It serves as a precision reference or overvoltage clamp in low-power analog supply rails, such as sensor biasing, ADC reference stabilization, and microcontroller reset circuitry.

For engineers reviewing the BZX84-B47,215 datasheet, BZX84-B47,215 pinout, BZX84-B47,215 application, or BZX84-B47,215 equivalent, key selection criteria include its 47 V Zener voltage tolerance (±2 %), thermal resistance (R_th(j-a) = 500 K/W), differential resistance (375 Ω max), temperature coefficient (0.05 mV/K), and SOT23-compatible footprint for space-constrained PCB layouts.

Technical Context

This device operates as a two-terminal shunt regulator, maintaining stable reverse-biased voltage across its cathode–anode terminals when current exceeds the knee threshold (~0.25 mA). Its Zener mechanism dominates conduction above ~5 V, delivering predictable regulation with low dynamic impedance (≤375 Ω) at I_Z = 2 mA.

Designed for surface-mount assembly on FR4 PCBs with single-sided 70 µm copper, it relies on junction-to-ambient thermal resistance (500 K/W) and junction-to-solder-point resistance (330 K/W) to manage self-heating under continuous 250 mW dissipation or transient 40 W surges (100 µs pulse).

Key Specifications

Pinout & Package

Package: SOT23 (TO-236AB), 3-lead surface-mount plastic package with standard footprint per Figure 12 (reflow) and Figure 13 (wave soldering); dimensions: 2.9 mm × 1.3 mm × 1.0 mm (L × W × H), lead pitch 0.95 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ4705LT1G and BZX84-C47-TP, BZX84-B47,215 offers superior voltage accuracy (±2 % vs. ±5 %) and lower temperature drift (0.05 mV/K), making it optimal for reference-grade applications where regulation stability directly impacts measurement fidelity or logic threshold integrity.

Availability

BZX84-B47,215 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, microcontroller reset circuits, ADC reference buffering, and overvoltage protection clamps requiring stable component supply, consistent parametric performance, and SOT23 footprint compatibility.

Supply support for BZX84-B47,215 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 industrial-grade components.

The BZX84 series belongs to Nexperia's precision Zener regulator product line, engineered for stable voltage reference and clamping in space-constrained, cost-sensitive consumer, industrial, and computing applications.

FAQ

What is the maximum continuous reverse current this diode can handle at 47 V?

The BZX84-B47,215 is not rated for continuous operation at its full Zener voltage. At V_R = 47 V, reverse current is limited by power dissipation: I_Z(max) = P_tot/V_Z ≈ 250 mW / 47 V ≈ 5.3 mA. Exceeding this risks thermal runaway due to junction temperature exceeding 150 °C on standard FR4 PCBs.

Can Pin 2 be used as a heatsink or grounded for thermal improvement?

No - Pin 2 is internally not connected (n.c.) and has no electrical or thermal bond to the silicon die. Connecting it to ground or a copper pour provides no thermal benefit and may risk solder bridging or unintended coupling in high-frequency circuits. Thermal path is exclusively through Pins 1 (anode) and 3 (cathode) to PCB copper.

How does the 0.05 mV/K temperature coefficient affect regulation accuracy over –40 °C to +85 °C?

Over a 125 K temperature span, the coefficient contributes ±6.25 mV (0.05 mV/K × 125 K) drift to the 47 V nominal voltage - a ±0.013 % change. Combined with ±2 % initial tolerance, total V_Z variation remains within ±2.013 %, preserving accuracy in non-precision industrial applications without active compensation.

Is this part suitable for automotive applications per AEC-Q200?

No - the BZX84-B47,215 is explicitly designated as non-automotive qualified in the revision history (Rev. 7, Section 13). Nexperia offers separate AEC-Q200-qualified variants (e.g., BZX84-Q series) with extended temperature testing, enhanced reliability screening, and automotive-specific documentation. This part lacks those qualifications and must not be used in safety-critical vehicle systems.