Nexperia USA Inc. BZX84J-C43,115

Overview

BZX84J-C43,115 from Nexperia is a 43 V ±5 % Zener voltage regulator diode in SOD323F (SC-90) package, rated for 550 mW total power dissipation and 40 W non-repetitive peak reverse power at tp = 100 µs, used for precision voltage reference and overvoltage protection in automotive power rails.

For engineers reviewing the BZX84J-C43,115 datasheet, BZX84J-C43,115 pinout, BZX84J-C43,115 application, or BZX84J-C43,115 equivalent, key selection criteria include Zener voltage tolerance (±5 %), differential resistance (325 Ω at IZ = 5 mA), junction temperature limit (150 °C), AEC-Q101 qualification, and SC-90 thermal resistance (Rth(j-a) = 230 K/W).

Technical Context

This Zener diode operates in reverse breakdown to maintain stable 43 V regulation under controlled current conditions (IZ = 5 mA). Its low differential resistance (325 Ω) ensures minimal voltage deviation across load variations, while its negative temperature coefficient (SZ = +56 mV/K at IZ = 5 mA, per Table 9 interpolation) supports predictable thermal drift behavior.

Designed for surface-mount use on FR4 PCBs with single-sided copper, it delivers 40 W non-repetitive surge capability (tp = 100 µs, square wave) and withstands ambient temperatures from −55 °C to +150 °C, meeting AEC-Q101 stress test requirements for automotive electronics.

Key Specifications

Pinout & Package

SOD323F (SC-90) is a 2-terminal surface-mount plastic package with cathode-marked lead (bar marking on top surface), 0.65 mm lead pitch, and 1.35 mm body length. Thermal performance assumes mounting on FR4 with 1 cm² cathode pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84J-C43,115, the BZX84-C43,115 offers identical electrical specs but reduced automotive reliability assurance, while MMSZ43ET1G trades compact size and surge capability for broader distributor availability and legacy design compatibility.

Availability

BZX84J-C43,115 is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning, telecom line card protection, and infotainment power sequencing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for BZX84J-C43,115 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 focused on high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and energy-efficient solutions.

The BZX84J series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for voltage regulation and transient suppression in harsh automotive and industrial environments where thermal stability and surge resilience are critical.

FAQ

What is the maximum continuous forward current for BZX84J-C43,115?

The absolute maximum forward current (IF) is 250 mA per Table 5. However, forward conduction is not its intended operating mode; the device is designed for reverse-biased Zener regulation. Forward voltage is specified at 100 mA (VF ≤ 1.1 V), but sustained forward bias above 10 mA risks thermal overstress due to low thermal resistance and lack of forward-rated derating curves.

How does the temperature coefficient affect regulation accuracy at 125 °C ambient?

At IZ = 5 mA, the temperature coefficient (SZ) is +56 mV/K (interpolated from Table 9 data for 43 V type). Over a 100 K rise from 25 °C to 125 °C, VZ shifts +5.6 V - resulting in ~48.6 V regulation. This must be accounted for in reference designs requiring tight tolerance across temperature; derating or compensation circuits may be needed.

Can BZX84J-C43,115 replace BZX84-C43 in an existing design?

Yes, electrically and physically - same SOD323F package, 43 V ±5 % rating, and pinout. However, BZX84J-C43,115 adds AEC-Q101 qualification and lower differential resistance (325 Ω vs. 350 Ω), improving regulation stability and automotive suitability. No layout change is needed, but qualification retesting is recommended for safety-critical applications.

What is the minimum reverse current required to achieve rated Zener voltage?

The datasheet specifies VZ at IZ = 5 mA (Table 9). Below 1 mA, regulation becomes nonlinear: at IZ = 1 mA, VZ drops to ~41.5 V (extrapolated from typical IR vs. VR curves in Fig. 10). For stable 43 V operation, maintain IZ ≥ 5 mA; below that, voltage error exceeds ±3 % and rdiff rises sharply.