Nexperia USA Inc. PZU84-B12-QR

Overview

PZU84-B12-QR from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT23 package, rated for 12 V nominal breakdown voltage (11.42 V to 12.60 V), 250 mW total power dissipation, and qualified to AEC-Q101 for automotive use. It delivers hard breakdown knee, low leakage current (<0.1 μA at VR = 9 V), and differential resistance of 80 Ω at IZ = 5 mA - deployed in precision voltage reference and overvoltage protection circuits within engine control units.

For engineers reviewing the PZU84-B12-QR datasheet, PZU84-B12-QR pinout, PZU84-B12-QR application, or PZU84-B12-QR equivalent, key selection criteria include Zener voltage tolerance, dynamic impedance at low bias current, thermal resistance (Rth(j-a) = 500 K/W), and AEC-Q101 qualification status for under-hood deployment.

Technical Context

This Zener diode operates in reverse-biased breakdown mode with a specified nominal working voltage of 12 V and tight ±2 % tolerance. Its differential resistance of 80 Ω at 5 mA ensures stable regulation under moderate load transients, while the temperature coefficient of +6.0 mV/K (typical at IZ = 5 mA) enables predictable drift compensation in automotive ambient ranges (−55 °C to +150 °C).

The device features a not-connected (n.c.) terminal (Pin 2), isolating internal structure from external circuitry to minimize parasitic coupling. Its SOT23 footprint supports high-density PCB layouts, and the 40 W non-repetitive peak reverse power rating (tp = 100 μs) provides transient surge resilience during load dump events.

Key Specifications

Pinout & Package

SOT23 plastic surface-mount package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch, single-sided 70 μm copper FR4 mounting.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C12, PZU84-B12-QR offers tighter tolerance and automotive qualification; versus MMSZ4687, it trades higher thermal resistance for superior voltage precision and lower leakage - making it optimal for space-constrained, accuracy-driven automotive subsystems.

Availability

PZU84-B12-QR is available at Aetrix Electronics and suitable for engine control units, body control modules, and ADAS camera power supplies requiring stable component supply across automotive production lifecycles.

Supply support for PZU84-B12-QR 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 components.

The PZU84-Q series belongs to Nexperia's AEC-Q101-qualified Zener regulator portfolio, engineered specifically for precision voltage reference and transient protection in harsh automotive environments.

FAQ

What is the exact Zener voltage range for PZU84-B12-QR at 5 mA test current?

The guaranteed Zener voltage range is 11.42 V to 12.60 V at IZ = 5 mA and Tj = 25 °C, per Table 8 of the Rev. 4 datasheet. This 1.18 V span reflects the ±2 % tolerance applied to the nominal 12 V rating, and remains valid across the full −55 °C to +150 °C operating junction temperature range.

Is Pin 2 truly unused, and what happens if it is accidentally soldered?

Yes, Pin 2 is internally not connected (n.c.) and serves no electrical function. Accidental soldering creates a mechanical tie-point only - no short circuit or parametric shift occurs, but it may induce mechanical stress during thermal cycling. Nexperia's recommended footprint (Fig. 10) excludes solder paste on Pin 2 to prevent unintended bridging.

How does the 40 W non-repetitive peak power rating translate to real-world surge handling?

The 40 W rating applies to a 100 μs square-wave pulse with Tj = 25 °C prior to surge (Table 5). In practice, this allows absorption of ISO 7637-2 Pulse 5a load-dump events (up to 60 V, 100 ms) when used with appropriate series impedance - verified in Nexperia application note AN90031 for automotive clamp networks.

Does the +6.0 mV/K temperature coefficient improve or degrade regulation stability?

The +6.0 mV/K coefficient (typical at IZ = 5 mA) causes Zener voltage to rise linearly with junction temperature - a known behavior for 12 V Zeners. System designers compensate by pairing it with negative-TC components (e.g., silicon bandgap references) or using it in ratiometric sensing topologies where drift cancels out.