Nexperia USA Inc. BZX384-A3V0X

Overview

BZX384-A3V0X from Nexperia is a ±1 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, designed for precision low-power voltage reference and clamping in space-constrained PCBs. It delivers a nominal 3.0 V breakdown voltage at 5 mA, with 95 Ω max differential resistance, 10 μA max reverse current at 1 V, and operates across –65 °C to +150 °C ambient range - used in power supply feedback loops and analog sensor biasing.

For engineers reviewing the BZX384-A3V0X datasheet, BZX384-A3V0X pinout, BZX384-A3V0X application, or BZX384-A3V0X equivalent, key selection criteria include tight 3.0 V ±1 % tolerance, low 95 Ω dynamic impedance, thermal stability up to 150 °C junction temperature, and compatibility with reflow/wave soldering on FR4 PCBs using standard SOD323 footprints.

Technical Context

This device functions as a two-terminal silicon Zener diode operating in reverse breakdown mode to maintain stable DC voltage under varying load or input conditions. Its regulation relies on controlled avalanche and Zener mechanisms depending on voltage level, with specified test current of 5 mA and guaranteed knee behavior down to 1 mA.

Thermal design is constrained by 415 K/W junction-to-ambient resistance in free air and 110 K/W junction-to-solder-point resistance, requiring careful PCB copper area allocation. Non-repetitive surge capability supports 40 W peak reverse power for ≤100 μs pulses at 25 °C initial junction temperature.

Key Specifications

Pinout & Package

SOD323 (SC-76) surface-mount plastic package with 2 leads; cathode marked by bar on top surface; footprint compatible with JEDEC MS-012AC standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX384-A3V0X, MMBZ5226BS trades tighter thermal resistance (350 K/W vs 415 K/W) for looser tolerance and larger package, while BZX384-C3V0 retains identical form factor and leakage but sacrifices 4× voltage accuracy - making the A-grade optimal for closed-loop regulation where stability and repeatability are mandatory.

Availability

BZX384-A3V0X is available at Aetrix Electronics and suitable for power supply feedback, sensor bias reference, overvoltage clamp, and logic-level protection requiring stable component supply across industrial, IoT, and consumer electronics programs.

Supply support for BZX384-A3V0X 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 headquartered in Nijmegen, Netherlands, specializing in high-volume, high-reliability discrete and logic devices for automotive, industrial, and consumer markets.

The BZX384 series belongs to Nexperia's precision Zener diode product line, engineered specifically for low-power voltage regulation and clamping in compact, thermally demanding PCB layouts - emphasizing tight tolerance, low dynamic impedance, and robust surge immunity.

FAQ

What is the maximum continuous power dissipation for BZX384-A3V0X at 70 °C ambient?

At 70 °C ambient, derating applies per the thermal resistance of 415 K/W. With a 150 °C max junction temperature, allowable temperature rise is 80 K, limiting continuous power to approximately 193 mW (80 K ÷ 415 K/W). This must be verified against actual PCB copper area and airflow conditions.

Can BZX384-A3V0X replace a 3.3 V Zener in a 3.3 V LDO feedback network?

No - BZX384-A3V0X has a nominal 3.0 V breakdown voltage, not 3.3 V. Using it in a 3.3 V feedback path would cause output voltage to drop to ~3.0 V. For 3.3 V regulation, BZX384-A3V3 (2.97–3.03 V) is insufficient; BZX384-A3V3 is actually rated 3.3 V ±1 % (3.26–3.34 V), confirmed in Table 8.

Is the cathode marking visible under optical inspection on BZX384-A3V0X?

Yes - the cathode is indicated by a distinct marking bar on the top surface of the SOD323 package, aligned with Pin 1 per Table 2 and Figure 11. This bar remains visible after reflow soldering and is detectable via automated optical inspection (AOI) systems calibrated for SC-76 packages.

Does BZX384-A3V0X meet RoHS and REACH requirements?

Yes - BZX384-A3V0X is manufactured by Nexperia in compliance with EU RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Material declarations and substance compliance reports are available through Nexperia's official product portal using the full orderable part number.