Nexperia USA Inc. PDZ18B,115

Overview

PDZ18B,115 from Nexperia is a single silicon Zener diode optimized for low-power voltage regulation and reference applications in space-constrained SMD designs. It delivers a nominal 18 V Zener voltage at 5 mA (17.56–18.35 V), with ±2 % tolerance, 80 Ω max differential resistance at 5 mA, 0.05 μA max reverse leakage at 13 V, and 130 K/W junction-to-solder-point thermal resistance in SOD323 package.

For engineers reviewing the PDZ18B,115 datasheet, PDZ18B,115 pinout, PDZ18B,115 application, or PDZ18B,115 equivalent, key selection criteria include Zener voltage accuracy at low test current (IZ = 5 mA), low dynamic impedance for stable regulation under varying load, cathode-marked SOD323 footprint compatibility, and thermal performance on FR4 PCBs with standard reflow soldering.

Technical Context

This Zener diode operates in reverse breakdown to maintain a stable reference voltage across its terminals. Its hard breakdown knee and low leakage (≤0.05 μA at VR = 13 V) support precision biasing and overvoltage clamping in low-current analog circuits.

The device exhibits a positive temperature coefficient of +14.4 mV/K at IZ = 5 mA, enabling predictable drift compensation in temperature-sensitive references. Its 1.5 pF capacitance at 0 V (f = 1 MHz) ensures minimal signal coupling in high-frequency filtering or noise suppression roles.

Key Specifications

Pinout & Package

PDZ18B,115 is housed in a compact SOD323 (SC-76) surface-mount plastic package measuring 1.8 × 1.35 × 0.95 mm, with cathode indicated by a marking bar on the top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PDZ18B,115, BZX584-C18 trades voltage accuracy and thermal resistance for miniaturization, while MMSZ5245B offers higher power margin at the cost of regulation precision and board area - making PDZ18B,115 optimal for space-constrained, low-leakage 18 V reference designs.

Availability

PDZ18B,115 is available at Aetrix Electronics and suitable for voltage reference generation, overvoltage protection, low-power biasing, and signal level translation requiring stable component supply and tight Zener voltage tolerance.

Supply support for PDZ18B,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 specializing in high-performance, energy-efficient components for automotive, industrial, and consumer applications, with leadership in discrete devices and logic ICs.

PDZ18B,115 belongs to the PDZ-B series of low-power Zener diodes designed specifically for general-purpose voltage regulation and reference functions in compact SMD systems where reliability, consistency, and thermal efficiency are critical.

FAQ

What is the maximum continuous reverse current the PDZ18B,115 can handle at 25 °C ambient?

The PDZ18B,115 has no specified maximum continuous reverse current rating; instead, its safe operating limit is defined by total power dissipation. At 25 °C ambient on FR4 PCB, it supports up to 400 mW, corresponding to ~22.2 mA at 18 V (P = V × I). Exceeding this causes junction temperature rise beyond 150 °C, risking permanent damage.

How does the +14.4 mV/K temperature coefficient affect circuit performance?

The +14.4 mV/K coefficient means the Zener voltage increases by approximately 14.4 mV per degree Celsius rise in junction temperature at 5 mA. Over a 50 °C ambient range, this yields ~0.72 V drift - requiring thermal design margining or compensation in precision references, but offering predictable behavior for temperature-sensing auxiliary functions.

Can PDZ18B,115 be used in forward-biased configurations?

Yes - its forward voltage is rated ≤0.9 V at 10 mA and ≤1.1 V at 100 mA. This enables dual-use as a low-drop rectifier or logic-level clamp, though its primary design intent and characterization focus remain reverse-bias Zener regulation; forward characteristics are secondary and not optimized for switching speed or surge handling.

Is the SOD323 package compatible with standard reflow soldering profiles?

Yes - Nexperia specifies a reflow footprint with 0.6 mm solder lands and 0.5 mm solder resist openings (Fig. 9), aligned with IPC-7351B medium density standards. The device is qualified for JEDEC J-STD-020D-compliant lead-free reflow, with peak temperature up to 260 °C and time above liquidus ≤60 seconds.