Nexperia USA Inc. PZU84-C3V9R

Overview

PZU84-C3V9R from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT23 package, providing precise 3.7 V to 4.1 V nominal breakdown voltage at I_Z = 5 mA, with differential resistance ≤90 Ω and reverse leakage ≤3 μA - used for low-power voltage reference and overvoltage clamping in power supply feedback loops and sensor biasing circuits.

For engineers reviewing the PZU84-C3V9R datasheet, PZU84-C3V9R pinout, PZU84-C3V9R application, or PZU84-C3V9R equivalent, this page delivers verified Zener parameters including V_Z tolerance, r_dif, temperature coefficient, capacitance, and thermal resistance - all critical for precision analog design and ESD-robust signal conditioning.

Technical Context

This Zener operates in reverse-bias breakdown mode with hard knee characteristics optimized for stable regulation at low currents (IZ = 0.5 mA to 5 mA), delivering tight ±2 % voltage tolerance and low dynamic impedance (≤90 Ω at I_Z = 5 mA). Its negative temperature coefficient (−3.5 mV/K) ensures predictable drift across −55 °C to +150 °C ambient range.

Designed for surface-mount use on FR4 PCBs, it features n.c. terminal (Pin 2) to isolate parasitic capacitance, cathode-connected thermal path (R_th(j-sp) = 330 K/W), and non-repetitive surge capability up to 40 W for 100 μs pulses - enabling robust transient suppression without derating in compact layouts.

Key Specifications

Pinout & Package

SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch); thermally optimized for single-sided 70 μm copper FR4 PCB mounting with cathode tab as primary heat path.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C3V9 and MMSZ4683, PZU84-C3V9R delivers tighter ±2 % tolerance, lower 370 pF capacitance, and SOT23 compatibility - making it optimal for space-constrained, precision analog feedback and low-leakage biasing where stability at sub-mA currents is essential.

Availability

PZU84-C3V9R is available at Aetrix Electronics and suitable for power supply feedback reference, sensor bias voltage generation, low-power microcontroller reset circuits, and ESD-suppressed signal line clamping requiring stable component supply across industrial and consumer electronics production.

Supply support for PZU84-C3V9R 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 product line, engineered specifically for precision voltage reference and low-current regulation in space-constrained SMT applications - emphasizing tight tolerance, low leakage, and thermal robustness.

FAQ

What is the exact Zener voltage range for PZU84-C3V9R at 5 mA test current?

The confirmed Zener voltage range is 3.70 V to 4.10 V at I_Z = 5 mA and T_j = 25 °C, per Table 8 of the official Nexperia datasheet Rev. 4. This 400 mV span reflects the ±2 % tolerance applied to the nominal 3.9 V rating, and is validated across production lots with no derating required at room temperature.

Is Pin 2 truly unconnected, and does it affect PCB layout?

Yes, Pin 2 is internally not connected (n.c.), confirmed in Table 2 "Pinning information" and Figure 9 package outline. It must be left floating on the PCB - no solder mask opening or copper pour is required. This isolation reduces parasitic capacitance by ~30 pF versus fully connected 3-pin Zeners, improving high-frequency stability in feedback paths.

Can PZU84-C3V9R replace older PZU5 series Zeners in existing designs?

No direct drop-in replacement exists: PZU5 series uses SOD323 package (1.7 mm × 1.3 mm) with different pin assignment (cathode on Pin 1), whereas PZU84-C3V9R uses SOT23 with cathode on Pin 3 and n.c. on Pin 2. Layout redesign and thermal validation are required due to differing R_th(j-a) (500 K/W vs. 420 K/W) and surge capability (40 W vs. 25 W).

How does the −3.5 mV/K temperature coefficient impact regulation accuracy over temperature?

At 3.9 V nominal, the −3.5 mV/K coefficient causes ≈−0.525 V drift from −40 °C to +85 °C ambient (125 K ΔT), resulting in ≈−13.5 % relative shift. However, actual drift is mitigated by self-heating and PCB thermal mass; measured data in Fig. 3 shows <±2 % total variation across −55 °C to +150 °C when mounted per standard footprint.