Nexperia USA Inc. PZU84-C12R

Overview

PZU84-C12R from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT23 package, providing precise 12 V nominal regulation at 5 mA test current with 9 Ω typical differential resistance and −2.0 mV/K temperature coefficient. It operates within −55 °C to +150 °C ambient range and delivers stable reference voltage for low-power analog circuits, power supply feedback paths, and overvoltage protection clamping.

For engineers reviewing the PZU84-C12R datasheet, PZU84-C12R pinout, PZU84-C12R application, or PZU84-C12R equivalent, this page details its verified Zener breakdown behavior, thermal resistance (330 K/W junction-to-solder-point), leakage current (<0.1 μA at VR = 10 V), hard breakdown knee, and SOT23 terminal configuration - all critical for precision voltage reference and ESD-tolerant clamp design.

Technical Context

The PZU84-C12R is a silicon planar Zener diode optimized for sharp, repeatable reverse breakdown at 12 V with minimal voltage drift over temperature (−2.0 mV/K) and low dynamic impedance (9 Ω at IZ = 5 mA). Its construction enables stable operation under transient surge conditions up to 40 W non-repetitive peak reverse power (tp = 100 μs).

Designed for surface-mount use on FR4 PCBs with standard SOT23 footprint, it features a not-connected (n.c.) terminal (Pin 2) to isolate parasitic capacitance and improve high-frequency stability. The cathode (Pin 3) serves as the primary thermal path, with Rth(j-sp) = 330 K/W enabling reliable dissipation of 250 mW total power at Tamb = 25 °C.

Key Specifications

Pinout & Package

SOT23 plastic surface-mounted package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch); thermally optimized for solder-point heat transfer via cathode tab.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C12 and MMSZ5242B, PZU84-C12R offers tighter tolerance, lower dynamic impedance, and an isolated n.c. pin that reduces parasitic capacitance - making it superior for high-accuracy, high-frequency, and space-constrained reference designs.

Availability

PZU84-C12R is available at Aetrix Electronics and suitable for power supply feedback loops, overvoltage clamp protection, and low-power sensor reference applications requiring stable component supply, long-term parametric consistency, and RoHS-compliant SMT assembly.

Supply support for PZU84-C12R 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 high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified and industrial-grade components.

The PZU84 series belongs to Nexperia's general-purpose Zener regulator portfolio, engineered specifically for precision voltage reference and clamping in space-constrained, thermally demanding applications across consumer, industrial, and communications equipment.

FAQ

What is the maximum continuous reverse current the PZU84-C12R can sustain without degradation?

The PZU84-C12R supports up to 200 mA forward current per absolute maximum ratings, but for Zener operation, sustained reverse current must remain within power limits: at Tamb = 25 °C, 250 mW dissipation corresponds to ≤20.8 mA at 12 V. Exceeding this requires derating per Rth(j-a) = 500 K/W to avoid junction temperatures above 150 °C.

Does Pin 2 (n.c.) require PCB trace isolation or grounding?

No - Pin 2 is internally unconnected and electrically floating. It may be left un-routed, tied to ground, or connected to adjacent copper pour without functional impact. However, leaving it unconnected avoids unintended capacitive coupling and aligns with Nexperia's recommended layout for optimal high-frequency performance.

How does the −2.0 mV/K temperature coefficient affect accuracy over −40 °C to +85 °C?

Across −40 °C to +85 °C, the coefficient causes ≈−250 mV total drift (125 K × −2.0 mV/K). With nominal VZ = 12 V and ±2 % initial tolerance (±240 mV), worst-case total error reaches ±490 mV - so system-level compensation (e.g., matched NTC network) is needed for sub-1 % accuracy over full temperature range.

Can PZU84-C12R replace a TL431 in adjustable shunt regulator circuits?

No - the PZU84-C12R is a fixed-voltage Zener diode without internal error amplifier or reference, so it cannot replicate TL431's programmable output or high-gain feedback control. It can serve only as a passive 12 V clamp or reference in simple circuits where regulation is handled externally by discrete op-amps or comparators.