Nexperia USA Inc. PDZ4.7B-QX

Overview

PDZ4.7B-QX from Nexperia is a single silicon Zener diode optimized for low-power voltage regulation and reference applications, with a nominal Zener voltage of 4.7 V (4.55–4.75 V at I_Z = 5 mA), ±2 % tolerance, 600 Ω dynamic impedance at 1 mA, and 2 µA reverse leakage at V_R = 4.0 V - packaged in SOD323 (SC-76) for space-constrained automotive and industrial PCBs.

For engineers reviewing the PDZ4.7B-QX datasheet, PDZ4.7B-QX pinout, PDZ4.7B-QX application, or PDZ4.7B-QX equivalent, this device serves as a precision, AEC-Q101-qualified voltage clamp in power supply feedback paths, overvoltage protection circuits, and analog reference nodes where thermal stability (−1.4 mV/K at 5 mA) and low leakage are critical.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load and temperature conditions. Its −1.4 mV/K temperature coefficient at I_Z = 5 mA indicates slight negative drift, enabling predictable compensation in bias networks.

Designed for surface-mount assembly on FR4 PCBs with standard footprint, it delivers 400 mW total power dissipation at T_amb = 25 °C and derates linearly above that ambient, with junction-to-solder-point thermal resistance of 130 K/W - supporting reliable operation in compact automotive ECUs and sensor modules.

Key Specifications

Pinout & Package

PDZ4.7B-QX is housed in a SOD323 (SC-76) plastic surface-mount 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 BZX84-C4V7 and MMSZ4704T1G, PDZ4.7B-QX uniquely combines AEC-Q101 qualification, ±2 % tolerance, and SOD323 size - making it the only choice for space-constrained automotive voltage clamping where long-term reliability and tight regulation are jointly required.

Availability

PDZ4.7B-QX is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning, USB-C power delivery monitors, and smart home smoke detector MCU bias circuits requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for PDZ4.7B-QX 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 efficiency-driven, high-volume discrete and logic devices, with leadership in automotive-qualified components and advanced packaging.

PDZ4.7B-QX belongs to the PDZ-B-Q series of AEC-Q101-qualified Zener diodes engineered specifically for voltage regulation and clamping in harsh-environment automotive and industrial electronics.

FAQ

What is the maximum continuous reverse current the PDZ4.7B-QX can handle without degradation?

The PDZ4.7B-QX has an absolute maximum non-repetitive peak reverse current (I_ZSM) of 8.0 A for t_p = 100 µs square wave pulses, but its continuous Zener current is limited by thermal dissipation. At 25 °C ambient on FR4 PCB, sustained operation above ~85 mA will exceed 400 mW P_tot, risking thermal runaway unless derated per Fig. 1's power curve.

How does the −1.4 mV/K temperature coefficient affect circuit performance at 125 °C?

At I_Z = 5 mA, the Zener voltage shifts by approximately −140 mV from 25 °C to 125 °C (ΔT = 100 K × −1.4 mV/K), resulting in a V_Z ≈ 4.61 V. This predictable drift enables first-order compensation in reference designs but requires verification against system-level voltage margin budgets.

Can PDZ4.7B-QX be used in parallel for higher power handling?

No - Zener diodes exhibit negative temperature coefficients and mismatched characteristics, causing current hogging when paralleled. The datasheet specifies no parallel operation guidance, and thermal runaway risk increases significantly. For higher power, use a single higher-rated Zener or active regulation instead.

Is the SOD323 package compatible with standard reflow profiles for lead-free soldering?

Yes - Nexperia provides validated reflow footprint (Fig. 9) and profile guidance: peak temperature ≤ 260 °C, time above 217 °C ≤ 60 s, and ramp rate ≤ 3 °C/s. The SOD323's 0.95 mm height and 0.25 mm lead pitch are fully compatible with IPC-7095-compliant processes.