Nexperia USA Inc. BZX384-A27X

Overview

BZX384-A27X from Nexperia is a ±1 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 27 V nominal breakdown voltage at 2 mA, 300 mW total power dissipation, and 150 °C maximum junction temperature. It provides stable reference voltage in low-power linear regulators, overvoltage protection circuits, and precision biasing networks for analog sensor interfaces.

For engineers reviewing the BZX384-A27X datasheet, BZX384-A27X pinout, BZX384-A27X application, or BZX384-A27X equivalent, key selection criteria include its 27 V ±1 % Zener voltage tolerance, 300 mW power rating under FR4 PCB mounting conditions, differential resistance of 300 Ω at 2 mA, and thermal resistance of 415 K/W (junction-to-ambient).

Technical Context

This device operates as a two-terminal silicon Zener diode with controlled reverse-biased avalanche breakdown. Its regulation behavior is defined by specified Zener voltage (V_Z = 26.73 V to 27.27 V at I_Z = 2 mA), differential resistance (r_dif ≤ 300 Ω), and temperature coefficient (S_Z = +18.9 mV/K to +25.3 mV/K).

It exhibits non-repetitive peak reverse power dissipation up to 40 W for 100 μs pulses, reverse current < 0.05 μA at VR = 20 V, and forward voltage ≤ 0.9 V at IF = 10 mA. Thermal performance is characterized by R_th(j-a) = 415 K/W and R_th(j-sp) = 110 K/W on standard FR4 PCB.

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-B27, the A27X offers tighter voltage control critical for precision references; versus MMSZ4687-TP, it delivers superior accuracy and smaller footprint but lower power handling-making it optimal for space-constrained industrial sensing and regulation.

Availability

BZX384-A27X is available at Aetrix Electronics and suitable for industrial sensor biasing, low-power voltage reference design, and overvoltage clamp protection requiring stable component supply with guaranteed long-term continuity.

Supply support for BZX384-A27X 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, headquartered in Nijmegen, Netherlands.

The BZX384 series belongs to Nexperia's precision Zener diode product line, engineered specifically for stable voltage regulation in compact, cost-sensitive industrial and consumer electronics where ±1 % accuracy and SOD323 scalability are essential.

FAQ

What is the maximum continuous reverse current this diode can sustain at 27 V?

The BZX384-A27X is not rated for continuous reverse conduction at its Zener voltage. At V_R = 27 V, reverse current exceeds specification limits; sustained operation must be limited to I_Z ≤ 2 mA per datasheet test condition. Continuous dissipation above 300 mW risks thermal runaway due to its 415 K/W junction-to-ambient resistance.

Can this Zener diode replace a 24 V part in an existing circuit?

No-BZX384-A27X has a nominal 27 V breakdown voltage with ±1 % tolerance (26.73–27.27 V), which exceeds typical 24 V system margins. Substituting it for a 24 V Zener would raise regulated voltage by ~12.5 %, potentially overstressing downstream components like op-amps or ADC references unless circuit gain/offset is recalibrated.

How does the temperature coefficient affect regulation accuracy over −40 °C to +85 °C?

With S_Z = +18.9 to +25.3 mV/K, the Zener voltage increases ~1.1 V to ~1.5 V across that 125 K range. For a 27 V nominal value, this introduces +4.1 % to +5.6 % drift-requiring compensation in precision applications via series thermistors or dual-diode cancellation schemes.

Is this device suitable for automotive applications?

No-BZX384-A27X is explicitly designated as non-automotive qualified per Nexperia's revision history (Rev. 4, January 2023). It lacks AEC-Q200 qualification, extended temperature validation, and automotive-grade screening. Automotive designs require the −Q qualified variants, such as BZX384-A27-Q.