Nexperia USA Inc. BZX384-B62-QX

Overview

BZX384-B62-QX from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 62 V nominal breakdown voltage at 2 mA test current, 300 mW total power dissipation, and qualified to AEC-Q101 for automotive use. It provides stable reference voltage in low-power biasing, overvoltage protection, and voltage clamping circuits.

For engineers reviewing the BZX384-B62-QX datasheet, BZX384-B62-QX pinout, BZX384-B62-QX application, or BZX384-B62-QX equivalent, key selection factors include its 62 V Zener voltage with ±2 % tolerance, 150 °C maximum junction temperature, 450 Ω typical differential resistance at 2 mA, 0.9 V forward voltage at 10 mA, and non-repetitive peak reverse power capability of 40 W.

Technical Context

This Zener diode operates in reverse-biased breakdown mode to maintain a stable reference voltage across its terminals under varying load and supply conditions. Its regulation performance is defined by tight ±2 % tolerance, low 450 Ω differential resistance, and temperature coefficient of +43.4 mV/K at 2 mA, enabling predictable drift behavior in thermal environments.

The device supports both DC and transient regulation: steady-state operation up to 300 mW at Tamb ≤ 25 °C, and surge handling up to 40 W for 100 μs pulses. Its SOD323 footprint ensures compatibility with high-density PCB layouts while meeting automotive-grade reliability per AEC-Q101 stress testing.

Key Specifications

Pinout & Package

Package: SOD323 (SC-76), surface-mount plastic package with 2 leads, 1.35 mm × 0.85 mm body size, 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 BZX384-B62-QX, BZX384-B62-Q offers identical performance in a standard production variant, while MMSZ5259B-TP trades automotive qualification and tighter tolerance for higher power and lower cost-making it suitable only where AEC compliance is not mandated.

Availability

BZX384-B62-QX is available at Aetrix Electronics and suitable for automotive ECU reference design, industrial sensor signal conditioning, consumer power adapter feedback networks, and medical diagnostic equipment bias supply requiring stable component supply and AEC-Q101 traceability.

Supply support for BZX384-B62-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 focused on high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and energy-efficient solutions.

The BZX384-Q series belongs to Nexperia's automotive-grade Zener diode product line, engineered specifically for precision voltage reference and transient protection in harsh-environment electronic control modules.

FAQ

What is the maximum continuous reverse current for BZX384-B62-QX at 25 °C?

The maximum continuous reverse current is derived from the 300 mW power rating and 62 V Zener voltage: I_Z = P_tot/V_Z ≈ 4.8 mA at 25 °C ambient on FR4 PCB. This assumes no additional thermal derating and represents the upper limit for stable DC regulation without exceeding junction temperature limits.

Does BZX384-B62-QX require a series current-limiting resistor in standard Zener regulator configurations?

Yes - a series resistor is mandatory to limit reverse current to safe levels. For example, with a 70 V supply and target 4.8 mA Zener current, a 1.67 kΩ resistor sets appropriate bias. The resistor value must be calculated based on supply voltage, desired Zener current, and the diode's 62 V V_Z to avoid thermal runaway or exceeding P_tot.

How does the temperature coefficient of +43.4 mV/K affect regulation accuracy over automotive temperature ranges?

At 2 mA test current, the +43.4 mV/K coefficient means V_Z increases ~4.34 V over a 100 K rise (−40 °C to +60 °C). In practice, this drift is predictable and can be compensated in closed-loop systems; for open-loop references, it imposes a ±2.2 V uncertainty across the full −40 °C to +125 °C operating range.

Can BZX384-B62-QX be used in parallel for higher power dissipation?

No - Zener diodes should not be paralleled due to mismatched breakdown voltages causing current hogging. Even with matched units, minor V_Z variations lead to unequal current sharing and thermal instability. For higher power, use a single higher-rated Zener or implement active regulation with a pass transistor.