Nexperia USA Inc. PZU5.1DB2,115

Overview

PZU5.1DB2,115 from Nexperia is a dual isolated Zener diode pair in SOT353 (SC-88A) package, designed for precision voltage regulation and overvoltage protection in compact PCB layouts. It delivers 5.1 V nominal Zener voltage with ±2 % tolerance, 250 mW total power dissipation, 40 W non-repetitive peak reverse power, and AEC-Q101 qualification for automotive-grade reliability.

For engineers reviewing the PZU5.1DB2,115 datasheet, PZU5.1DB2,115 pinout, PZU5.1DB2,115 application, or PZU5.1DB2,115 equivalent, this device supports dual-rail regulation, ESD-tolerant I/O clamping, and low-capacitance (<300 pF) signal-line protection in space-constrained industrial and automotive control modules.

Technical Context

This dual-Zener device integrates two electrically isolated diodes in a single 5-pin SOT353 package-Pin 1 and Pin 3 are anodes, Pins 4 and 5 are cathodes, and Pin 2 is unconnected. Each diode operates independently with matched thermal characteristics and identical Zener voltage specification.

It features a low differential resistance of 250 Ω at I_Z = 5 mA, temperature coefficient of +0.3 mV/K near 5.1 V, and reverse current ≤2 µA at V_R = 3.5 V, enabling stable reference performance across −55 °C to +150 °C ambient range.

Key Specifications

Pinout & Package

SOT353 (SC-88A) is a 5-lead surface-mount plastic package measuring 2.2 mm × 1.35 mm × 0.95 mm, optimized for automated placement and reflow soldering on FR4 PCBs with standard footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C5V1,215 and PZU5.1B2,115, the PZU5.1DB2,115 uniquely delivers matched dual-Zener behavior with ±2 % tolerance and AEC-Q101 validation-enabling single-component solutions for automotive-grade dual-supply monitoring and bidirectional signal clamping where traceability and thermal tracking matter.

Availability

PZU5.1DB2,115 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC analog inputs, USB 2.0 ESD protection, and low-power IoT reference voltage generation requiring stable component supply and full traceability.

Supply support for PZU5.1DB2,115 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 high-performance discrete, logic, and PowerMOS semiconductors, spun off from NXP in 2017 and focused on automotive, industrial, computing, and consumer markets.

The PZUxDB2 series belongs to Nexperia's AEC-Q101-qualified Zener portfolio, engineered specifically for space-efficient, thermally robust voltage regulation and transient protection in harsh-environment electronics.

FAQ

What is the maximum continuous reverse current rating for each Zener diode in the PZU5.1DB2,115?

Each Zener diode is rated for a maximum continuous forward current of 200 mA and a maximum reverse current of 2 µA at V_R = 3.5 V. The device is not intended for sustained reverse conduction; its primary function is regulated breakdown at 5.1 V with controlled dynamic impedance.

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

No-Pin 2 is internally unconnected and must remain electrically floating. Grounding or routing copper to it provides no thermal benefit and risks shorting adjacent traces due to the 0.65 mm lead pitch. Thermal performance relies solely on solder joint conduction through Pins 4 and 5 to the PCB copper pour.

Is the PZU5.1DB2,115 suitable for bidirectional TVS applications like RS-485 bus protection?

Yes-its dual isolated structure allows back-to-back connection (e.g., anode1–cathode2 and anode2–cathode1) to form a symmetrical ±5.2 V clamping pair. Combined with its 40 W surge rating and 300 pF capacitance, it meets IEC 61000-4-2 Level 4 and IEC 61000-4-5 requirements for RS-485 transceiver protection.

How does the temperature coefficient of +0.3 mV/K affect long-term voltage reference stability?

At ±50 °C deviation from 25 °C, the Zener voltage shifts by ±15 mV (0.3 mV/K × 50 K), resulting in ±0.3 % change relative to 5.1 V. This is acceptable for 10-bit systems but requires calibration or compensation in 12-bit+ precision applications-unlike compensated references, it offers simplicity and low cost over ultra-stability.