Nexperia USA Inc. PZU9.1B3A,115

Overview

PZU9.1B3A,115 from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 9.1 V nominal working voltage at 5 mA, with 60 Ω maximum differential resistance, 10 nA reverse current at 0.5 mA, and 5.5 A non-repetitive peak reverse current - used for precision voltage reference and overvoltage clamping in low-power analog signal conditioning circuits.

For engineers reviewing the PZU9.1B3A,115 datasheet, PZU9.1B3A,115 pinout, PZU9.1B3A,115 application, or PZU9.1B3A,115 equivalent, key selection criteria include Zener voltage tolerance (±2 %), low leakage (≤10 nA @ I_Z = 0.5 mA), hard breakdown knee, thermal resistance (255 K/W junction-to-solder point), and SOD323 footprint compatibility with high-density PCB layouts.

Technical Context

This Zener diode operates in reverse-bias breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its design emphasizes low dynamic impedance (60 Ω max at I_Z = 5 mA) and intentional minor leakage rise for optimized noise reduction and fast transient response, per AN90031.

It features a hard breakdown knee and temperature coefficient of +5.5 mV/K at I_Z = 5 mA, enabling predictable regulation across -55 °C to +150 °C ambient range. The device is qualified for surface-mounted assembly on FR4 PCBs with standard tin-plated solder pads.

Key Specifications

Pinout & Package

SOD323 (SC-76) plastic surface-mount package with 2 leads, 1.3 mm pitch, and 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 PZU9.1B3A,115, BZX384-B9V1 trades leakage and impedance performance for broader distributor availability, while MMSZ4687T1G sacrifices size and tolerance for higher surge endurance and established qualification history in industrial power supplies.

Availability

PZU9.1B3A,115 is available at Aetrix Electronics and suitable for precision voltage reference, ESD protection clamp, and low-power sensor biasing applications requiring stable component supply, tight tolerance consistency, and SOD323 footprint compatibility.

Supply support for PZU9.1B3A,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 expert focused on high-volume, high-reliability discrete and logic devices, with leadership in advanced packaging and automotive-qualified components.

PZUxBA series belongs to Nexperia's general-purpose Zener regulator portfolio, designed specifically for space-constrained, low-power analog systems demanding tight voltage tolerance, low leakage, and robust surge handling in consumer, industrial, and communications equipment.

FAQ

What is the maximum continuous power dissipation for PZU9.1B3A,115 at 25 °C ambient?

The total power dissipation (P_tot) is rated at 320 mW when mounted on an FR4 PCB with single-sided copper and standard footprint. At elevated ambient temperatures, derating applies per the thermal resistance curve - e.g., at 70 °C ambient, usable power drops to approximately 220 mW based on R_th(j-a) = 390 K/W.

How does the B3 tolerance designation affect Zener voltage specification?

B3 indicates ±2 % tolerance at I_Z = 5 mA, meaning the actual V_Z falls between 9.15 V and 9.55 V. This is tighter than B-series (±5 %) and aligns with precision reference needs where regulation window must stay within ±100 mV of nominal 9.1 V.

Can PZU9.1B3A,115 be used in place of a 9.1 V Zener with ±5 % tolerance?

Yes, it is a direct functional upgrade: same voltage grade, identical SOD323 package, and pin-compatible layout. The improved ±2 % tolerance and lower r_dif enhance regulation accuracy without PCB redesign, though forward voltage (1.1 V at 100 mA) remains unchanged.

What is the significance of the "intentional minor rise of leakage current" cited in the datasheet?

This design feature, detailed in Application Note AN90031, slightly increases reverse current near breakdown to reduce junction capacitance variation and improve transient response - resulting in lower broadband noise and faster recovery after overvoltage events compared to conventional low-leakage Zeners.