Nexperia USA Inc. PZU18DB2,115

Overview

PZU18DB2,115 from Nexperia is a dual isolated general-purpose Zener diode in SOT353 (SC-88A) package, designed for precision voltage regulation and overvoltage protection in compact surface-mounted circuits. It features a nominal Zener voltage of 18 V (±2 % tolerance), non-repetitive peak reverse power dissipation of 40 W, total power dissipation ≤250 mW, and AEC-Q101 qualification for automotive use.

For engineers reviewing the PZU18DB2,115 datasheet, PZU18DB2,115 pinout, PZU18DB2,115 application, or PZU18DB2,115 equivalent, this device supports dual-channel independent regulation in space-constrained power rails, ESD-robust I/O clamping, and stable reference generation where tight voltage tolerance and low thermal resistance are critical.

Technical Context

This dual Zener diode integrates two electrically isolated Zener junctions in a single 5-pin SOT353 package - Pin 1 and Pin 5 form Diode 1 (anode/cathode), Pin 3 and Pin 4 form Diode 2 (anode/cathode), while Pin 2 is unconnected. Each diode operates independently with identical 18 V nominal breakdown voltage and matched ±2 % tolerance.

It delivers 13 A non-repetitive peak reverse current at 100 µs pulse width, exhibits 80 Ω typical differential resistance at I_Z = 5 mA, and maintains a temperature coefficient of +13 mV/K - enabling predictable voltage drift compensation in ambient-temperature-varying environments.

Key Specifications

Pinout & Package

SOT353 (SC-88A) is a 5-lead, very small outline surface-mount plastic package with 0.65 mm lead pitch, optimized for automated assembly and high-density PCB layouts. Its halogen-free variant (PZU18DB2/DG) meets RoHS and ELV compliance requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C18LT1G, PZU18DB2,115 saves 35 % board area and enables true dual-channel isolation; versus PZU18B2,115, it improves voltage accuracy by 3 % absolute, critical for precision feedback loops.

Availability

PZU18DB2,115 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, USB-C power adapters, and medical auxiliary supplies requiring stable component supply, long-term lifecycle support, and AEC-Q101 compliance.

Supply support for PZU18DB2,115 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 leader specializing in high-performance discrete, logic, and PowerMOS devices, with core expertise in automotive, industrial, and computing applications.

The PZUxDB2 series was engineered specifically for space-efficient, AEC-Q101-qualified voltage regulation and transient protection in next-generation automotive ECUs and industrial control modules.

FAQ

What is the maximum continuous Zener current for each diode in PZU18DB2,115?

The device supports a maximum forward current of 200 mA per diode, but continuous Zener operation is limited by thermal constraints. At 25 °C ambient, the 250 mW total power dissipation allows ~13.9 mA per diode at 18 V (assuming equal sharing), derating linearly above 25 °C per the 500 K/W junction-to-ambient thermal resistance.

Can Pin 2 be grounded or used as a shield connection?

No - Pin 2 is internally unconnected and must remain floating. Grounding or routing it may cause unintended parasitic coupling or violate the device's qualified thermal and electrical performance. The datasheet explicitly defines it as "not connected" with no internal bond wire or die attachment.

How does the +13 mV/K temperature coefficient affect regulation stability?

The positive temperature coefficient means V_Z increases by ~13 mV per °C rise in junction temperature. For a 50 °C ΔT, this yields ~0.65 V shift - acceptable in applications with narrow ambient ranges or where complementary TC components (e.g., NTC bias networks) compensate drift in closed-loop systems.

Is PZU18DB2,115 compatible with lead-free reflow profiles?

Yes - the SOT353 package is qualified for standard JEDEC J-STD-020D lead-free reflow, with peak temperatures up to 260 °C. The recommended profile uses ramp rates ≤3 °C/s, 60–120 s above 217 °C, and avoids exceeding 260 °C for more than 30 s, matching Nexperia's published soldering guidelines.