Nexperia USA Inc. BZX384-A4V7-QX

Overview

BZX384-A4V7-Q from Nexperia is a ±1 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, with nominal breakdown voltage 4.7 V at 5 mA, 500 Ω max differential resistance, and 3 μA max reverse current at 3.76 V. It delivers stable reference voltage for low-power biasing and overvoltage protection in automotive control modules, sensor signal conditioning, and power supply feedback paths.

For engineers reviewing the BZX384-A4V7-Q datasheet, BZX384-A4V7-Q pinout, BZX384-A4V7-Q application, or BZX384-A4V7-Q equivalent, this page provides verified Zener parameters, AEC-Q101 qualification status, thermal resistance data, and automotive-grade reliability context - all confirmed from Nexperia's official Rev. 1 product data sheet dated 6 September 2021.

Technical Context

This device operates as a two-terminal shunt voltage reference, conducting in reverse breakdown to clamp voltage across its terminals. Its ±1 % tolerance (BZX384-A series), 4.65–4.75 V breakdown range at I_Z = 5 mA, and −3.5 to +0.2 mV/K temperature coefficient enable precise regulation in temperature-stable circuits.

Designed for surface-mount use on FR4 PCBs with single-sided copper, it supports 300 mW steady-state dissipation and withstands non-repetitive 40 W surges (100 μs, T_j = 25 °C). The cathode-anode polarity is marked by a bar on the SOD323 body per Table 2 and Figure 11.

Key Specifications

Pinout & Package

Package: SOD323 (SC-76), plastic surface-mounted, 2-lead, dimensions per Figure 11 (2.7 × 1.6 mm body, 0.45 mm height).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX384-B4V7-Q, the A-grade part trades slightly higher r_dif for ±1 % accuracy critical in sensor interfaces; versus MMSZ4700T1G, it offers superior leakage control and automotive qualification in a smaller SOD323 footprint.

Availability

BZX384-A4V7-Q is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and smart meter reference circuit implementation requiring stable component supply and AEC-Q101 compliance.

Supply support for BZX384-A4V7-Q 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 advanced packaging.

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

FAQ

What is the maximum continuous forward current for BZX384-A4V7-Q?

The device is not rated for continuous forward conduction; its primary function is reverse-bias Zener operation. Absolute maximum forward current is 250 mA per Table 5, but sustained forward bias exceeds design intent and risks thermal runaway. Forward voltage is specified only for test conditions (0.9 V at 10 mA pulse), not operational use.

Can BZX384-A4V7-Q replace BZX384-C4V7-Q in an existing design?

No - the C-grade part has ±5 % tolerance (4.4–5.0 V), significantly wider than the A-grade's ±1 % (4.65–4.75 V). Substituting without circuit revalidation risks out-of-spec reference voltage, especially in temperature-sensitive sensor interfaces where 0.1 V shift alters calibration. Differential resistance (300 Ω vs. 500 Ω) and leakage (3 μA vs. 3 μA) are identical, but tolerance mismatch dominates.

How does the SOD323 package affect thermal performance compared to DO-35?

SOD323 has higher junction-to-ambient thermal resistance (415 K/W vs. ~300 K/W for DO-35 on same PCB) due to smaller copper pad area and shorter leadframe. However, its junction-to-solder-point resistance is lower (110 K/W), making it more effective when soldered directly to thermal vias or large copper pours. This trade-off favors compact automotive PCBs where board space is constrained but thermal management is actively designed.

Is BZX384-A4V7-Q suitable for use in a 12 V automotive power supply feedback loop?

Yes - its 4.7 V Zener voltage is commonly used with external resistive dividers to set regulated 12 V output (e.g., 12 V = 4.7 V × (R1+R2)/R2). The ±1 % tolerance ensures tight output regulation, and AEC-Q101 qualification confirms suitability for automotive 12 V system environments, including load dump and cold crank conditions when paired with appropriate series limiting resistor.