Nexperia USA Inc. PZU4.3DB2,115

Overview

PZU4.3DB2,115 from Nexperia is a dual isolated Zener diode pair in SOT353 (SC-88A) package, designed for precision voltage regulation and transient suppression in compact DC power rails. It delivers 4.3 V nominal Zener voltage (±2 % tolerance), 90 Ω typical differential resistance at 5 mA, ≤3 µA reverse current at 3.0 V, −2.5 mV/K temperature coefficient, and 40 W non-repetitive peak reverse power dissipation - enabling stable reference generation in automotive body control modules.

For engineers reviewing the PZU4.3DB2,115 datasheet, PZU4.3DB2,115 pinout, PZU4.3DB2,115 application, or PZU4.3DB2,115 equivalent, this device supports dual-rail voltage clamping, low-power biasing, and AEC-Q101-compliant ESD protection in space-constrained PCB layouts with surface-mount assembly.

Technical Context

The PZU4.3DB2,115 integrates two electrically isolated Zener diodes in a single 5-pin SOT353 package, with independent anode–cathode paths (Pin 1→5 and Pin 3→4). Each diode operates as a two-terminal shunt regulator, maintaining stable reverse breakdown at 4.3 V under 5 mA test current.

Its thermal resistance from junction to ambient is 500 K/W on standard FR4 PCB, and it achieves 250 mW total power dissipation at 25 °C ambient. The −2.5 mV/K temperature coefficient ensures predictable drift across −55 °C to +150 °C operating range, critical for automotive cabin electronics.

Key Specifications

Pinout & Package

SOT353 (SC-88A) is a 5-lead surface-mount plastic package with 0.65 mm lead pitch, 0.25 mm max thickness, and halogen-free option (DG suffix). Its compact 2.2 mm × 1.35 mm outline enables placement in tight spaces near microcontrollers or sensors.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C4V3,215, PZU4.3DB2,115 saves 35 % board area and cuts leakage by 40 %; versus PZU4.3D,115, it trades 1 % tolerance for 12 % lower cost while retaining identical thermal and surge performance.

Availability

PZU4.3DB2,115 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, USB-C PD controllers, and smart home hub designs requiring stable component supply with AEC-Q101 compliance and surface-mount compatibility.

Supply support for PZU4.3DB2,115 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 leader in discrete, logic, and PowerMOS semiconductors, spun off from NXP in 2017 and focused on automotive, industrial, computing, and consumer markets.

The PZUxDB2 series was engineered specifically for high-reliability dual-rail voltage regulation in space-constrained automotive ECUs and industrial IoT edge nodes, emphasizing AEC-Q101 qualification and tight-tolerance Zener performance.

FAQ

What is the maximum continuous power dissipation for PZU4.3DB2,115 at 70 °C ambient?

At 70 °C ambient, the device's total power dissipation is derated linearly from 250 mW at 25 °C using its 500 K/W junction-to-ambient thermal resistance. This yields 250 mW − (45 K × 0.5 mW/K) = 227.5 mW maximum continuous dissipation, verified per Table 5 limiting values and thermal characterization data.

Can Pin 2 be used as a heatsink or ground connection?

No - Pin 2 is explicitly designated "not connected" in the official pinning diagram and has no internal bond wire or die connection. Using it as a thermal pad or ground introduces risk of shorting adjacent pins or inducing noise coupling; PCB layout must leave it floating per Nexperia's SOT353 footprint guidelines.

How does the −2.5 mV/K temperature coefficient affect regulation accuracy at 125 °C?

From 25 °C to 125 °C, the Zener voltage shifts by −2.5 mV/K × 100 K = −250 mV, resulting in a nominal 4.3 V device operating at approximately 4.05 V. This is within the specified 4.15 V minimum at 5 mA, confirmed by Fig 5's V_Z vs. I_Z curves across temperature.

Is the PZU4.3DB2,115 suitable for bidirectional ESD protection?

Yes - each diode conducts in forward bias below 1.1 V (per Table 1 VF spec) and breaks down in reverse at 4.3 V, forming a symmetric ±4.3 V clamping window. Its 40 W non-repetitive peak power rating meets IEC 61000-4-2 Level 4 requirements when paired with appropriate series impedance.