Nexperia USA Inc. BZX38450-B5V6-QX

Overview

BZX38450-B5V6-QX from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, rated for 5.6 V nominal regulation at 50 µA test current, with ±2 % tolerance, 300 mW total power dissipation, and AEC-Q101 qualification for automotive use.

For engineers reviewing the BZX38450-B5V6-QX datasheet, BZX38450-B5V6-QX pinout, BZX38450-B5V6-QX application, or BZX38450-B5V6-QX equivalent, key selection criteria include low-bias operation at 50 µA, thermal resistance of 415 K/W (junction-to-ambient), differential resistance ≤400 Ω at 5 mA, and reverse leakage ≤2.0 µA at 5.6 V.

Technical Context

This Zener diode operates in reverse breakdown to maintain stable 5.6 V output under low-current conditions (IZ = 50 µA typical), with specified differential resistance of 400 Ω at 5 mA and temperature coefficient of −2.0 mV/K. Its design targets precision biasing where minimal quiescent current is critical.

The device features intentional minor leakage optimization per AN90031 for fast switching and noise reduction, and achieves junction temperatures up to 150 °C while maintaining regulation stability across −55 °C to +150 °C ambient range.

Key Specifications

Pinout & Package

Package: SOD323 (SC-76), surface-mounted plastic package; 2 leads; 1.3 mm pitch; 1.7 mm × 1.25 mm × 0.95 mm body; cathode marked by bar on top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX38450-B5V6-QX, the BZX384-C5V6-Q trades tighter tolerance for lower unit cost, while MMSZ5232B-7-F offers higher power handling at the expense of board area and AEC-Q101 qualification - making the original optimal for space-constrained, automotive-grade low-power regulation.

Availability

BZX38450-B5V6-QX is available at Aetrix Electronics and suitable for automotive sensor biasing, portable device reference, and industrial signal conditioning requiring stable component supply with AEC-Q101 assurance and traceable sourcing.

Supply support for BZX38450-B5V6-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 delivering high-performance logic, discrete, and MOSFET devices with focus on efficiency, reliability, and miniaturization for automotive and industrial markets.

The BZX38450-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for low-current, high-stability voltage regulation in safety-critical automotive subsystems and battery-sensitive portable electronics.

FAQ

What is the maximum reverse voltage this diode can withstand before breakdown?

The BZX38450-B5V6-QX is designed to regulate at 5.6 V nominal in reverse breakdown; its absolute maximum non-repetitive peak reverse voltage is not specified separately, but it must remain within the limiting value of 40 W non-repetitive peak reverse power dissipation at tp = 100 µs. Sustained reverse voltage above 5.6 V will cause increasing current flow governed by its Zener characteristic curve and differential resistance.

Does this part support reflow soldering, and what footprint is recommended?

Yes, BZX38450-B5V6-QX supports lead-free reflow soldering per JEDEC J-STD-020. The recommended footprint is defined in Figure 10 of the datasheet: two 0.5 mm × 1.5 mm solder lands spaced 1.3 mm apart, with 0.6 mm solder resist opening per pad, optimized for SOD323 (SC-76) thermal and mechanical reliability.

How does the −2.0 mV/K temperature coefficient affect regulation accuracy over temperature?

With a temperature coefficient of −2.0 mV/K, the Zener voltage decreases by approximately 2 mV per Kelvin rise in junction temperature. Over a 100 K range (e.g., −40 °C to +60 °C), this introduces up to ±200 mV drift - mitigated in practice by low power dissipation (keeping ΔT small) and system-level calibration in precision applications.

Is the cathode marking consistent across all BZX38450-Q series variants?

Yes, all BZX38450-Q series diodes, including BZX38450-B5V6-QX, use a single bar marking on the top surface to denote the cathode (Pin 1), aligned with the simplified outline in Table 2 of the datasheet. This marking is laser-etched and visible under 10× magnification, ensuring unambiguous orientation during automated placement.