Nexperia USA Inc. PZU4.7B3A,115

Overview

PZU4.7B3A,115 from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 4.7 V nominal working voltage, 800 Ω max differential resistance at 5 mA, and 2 µA max reverse current at 0.5 mA test condition. It delivers stable reference voltage in low-power analog circuits, power supply feedback loops, and overvoltage protection stages.

For engineers reviewing the PZU4.7B3A,115 datasheet, PZU4.7B3A,115 pinout, PZU4.7B3A,115 application, or PZU4.7B3A,115 equivalent, key selection criteria include Zener voltage tolerance (±2 %), low leakage (≤2 nA at VR = 0.5 V), hard breakdown knee, and thermal resistance of 255 K/W junction-to-solder-point - critical for compact PCB designs with limited copper area.

Technical Context

This Zener diode operates in reverse-biased breakdown mode to maintain precise DC voltage regulation across load and line variations. Its 4.7 V nominal Zener voltage exhibits a temperature coefficient of −1.4 mV/K at 5 mA, enabling predictable drift compensation in mid-range reference applications.

The device features a hard breakdown knee and very low dynamic impedance (800 Ω max at IZ = 5 mA), ensuring minimal output voltage variation under changing current conditions. Its SOD323 package supports high-density surface-mount assembly while maintaining thermal performance via optimized cathode pad layout.

Key Specifications

Pinout & Package

SOD323 (SC-76) plastic surface-mount package: 1.7 mm × 1.25 mm × 0.95 mm body, 1.3 mm lead pitch, cathode marked by bar on top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PZU4.7B3A,115, BZX384-B4V7,115 trades precision for cost, while MMSZ4702T1G sacrifices leakage performance and board density - making PZU4.7B3A,115 optimal for space-constrained, low-leakage, ±2 % reference designs.

Availability

PZU4.7B3A,115 is available at Aetrix Electronics and suitable for power supply feedback reference, overvoltage protection clamp, and low-power sensor biasing requiring stable component supply across production lifecycles.

Supply support for PZU4.7B3A,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 semiconductor manufacturer headquartered in Nijmegen, Netherlands, specializing in high-volume logic, discrete, and MOSFET solutions with emphasis on reliability and efficiency.

The PZUxBA series targets general-purpose Zener regulation in space-constrained consumer, industrial, and computing applications, prioritizing tight tolerance, low leakage, and robust surge capability in miniature SMD packages.

FAQ

What is the maximum continuous reverse current the PZU4.7B3A,115 can sustain?

The device has no specified maximum continuous reverse current; instead, its safe operating limit is defined by total power dissipation (320 mW at 25 °C ambient). At 4.7 V, this corresponds to ~68 mA average Zener current. Exceeding this requires thermal derating per the R_th(j-a) = 390 K/W curve or use of enhanced copper pads to leverage R_th(j-sp) = 255 K/W.

How does the −1.4 mV/K temperature coefficient affect circuit performance?

This negative coefficient means the Zener voltage decreases by 1.4 mV per Kelvin rise in junction temperature. In a 50 °C ambient-to-junction rise, V_Z drops ~70 mV - a 1.5 % shift. For precision applications, this must be compensated via circuit topology (e.g., complementary tempcos) or calibrated in firmware, especially above 70 °C ambient.

Can PZU4.7B3A,115 replace PZU4.7B2A in an existing design?

Yes - both share identical electrical specifications except tolerance: B2A is ±2 % (same as B3A), but B3A offers tighter statistical control per manufacturing lot. The "3" suffix indicates improved process consistency, not functional difference. No layout or schematic change is needed for drop-in substitution.

Is the SOD323 package compatible with standard reflow profiles?

Yes - Nexperia specifies compatibility with IPC/JEDEC J-STD-020D reflow profiles. The recommended solder land pattern (Fig. 10) uses 0.5 mm × 1.1 mm pads with 0.6 mm solder resist opening. Peak temperature must not exceed 260 °C for ≤10 seconds to avoid delamination or marking degradation.