Nexperia USA Inc. BZX384-B3V3-QF

Overview

BZX384-B3V3-Q from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 3.3 V nominal breakdown at 5 mA, with 300 mW total power dissipation and AEC-Q101 qualification for automotive use. It provides stable reference voltage in low-power biasing, overvoltage protection, and voltage clamping circuits.

For engineers reviewing the BZX384-B3V3-Q datasheet, BZX384-B3V3-Q pinout, BZX384-B3V3-Q application, or BZX384-B3V3-Q equivalent, key selection criteria include its 3.3 V ±2 % tolerance, 95 Ω max differential resistance at 5 mA, 5 μA reverse current at 2.5 V, -3.5 to 0.0 mV/K temperature coefficient, and SOD323 thermal performance (R_th(j-a) = 415 K/W).

Technical Context

This Zener diode operates in reverse-bias breakdown mode with a specified 3.3 V nominal working voltage at I_Z = 5 mA. Its differential resistance of ≤95 Ω ensures tight regulation under small-signal load variations, while the temperature coefficient range of −3.5 to 0.0 mV/K reflects moderate thermal drift optimized for mid-voltage stabilization.

The device supports non-repetitive surge handling up to 40 W (100 μs pulse), and is qualified per AEC-Q101 for automotive environments-enabling operation from −65 °C to +150 °C ambient and junction temperatures. Its SOD323 footprint enables high-density PCB layouts with validated reflow and wave soldering profiles.

Key Specifications

Pinout & Package

SOD323 (SC-76) surface-mount plastic package with 2 leads; compact 1.8 mm × 1.35 mm footprint and 0.45 mm profile suitable for space-constrained automotive and portable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX384-B3V3-Q, the BZX384-B3V3 offers identical regulation performance at lower cost but forfeits automotive qualification, while MMSZ4685T1G trades tolerance and qualification for higher power and wider availability-making it suitable only where AEC compliance is not mandated.

Availability

BZX384-B3V3-Q is available at Aetrix Electronics and suitable for automotive electronic control units, USB interface protection circuits, industrial sensor signal conditioning, and low-power IoT node regulation requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for BZX384-B3V3-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 essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and mobile markets.

The BZX384-Q series belongs to Nexperia's automotive-qualified Zener portfolio, engineered specifically for robust voltage reference and clamping in harsh-environment electronics where AEC-Q101 compliance and thermal stability are mandatory.

FAQ

What is the maximum continuous reverse current this diode can handle?

The BZX384-B3V3-Q has a maximum forward current rating of 250 mA, but its continuous reverse (Zener) current is limited by power dissipation. At 25 °C ambient on FR4 PCB, 300 mW / 3.3 V ≈ 91 mA is the theoretical max DC Zener current-though derating per thermal resistance (415 K/W) is required above 25 °C to avoid exceeding 150 °C junction temperature.

How does the −3.5 to 0.0 mV/K temperature coefficient affect circuit performance?

This coefficient means the Zener voltage decreases by up to 3.5 mV per Kelvin rise in junction temperature-resulting in up to ~35 mV drop from 25 °C to 125 °C. In precision references, this drift must be compensated via circuit topology (e.g., complementary diodes) or calibrated out in firmware; it is acceptable for non-critical clamping where absolute accuracy is secondary to fast response.

Can this diode replace a 3.3 V TVS for ESD protection?

No-while BZX384-B3V3-Q handles 40 W non-repetitive surges, it is not designed for fast ESD transients (IEC 61000-4-2). Its response time is too slow (>10 ns) and clamping voltage rises significantly above V_Z under high di/dt. Dedicated TVS diodes like PESD3V3L1BA have sub-nanosecond response and guaranteed clamping at 6–8 V, making them appropriate for ESD; BZX384-B3V3-Q serves best for slower overvoltage events like load dump.

Is the SOD323 package compatible with standard reflow profiles?

Yes-the datasheet specifies a validated reflow soldering footprint (Fig. 12) for SOD323, supporting JEDEC J-STD-020-compliant lead-free profiles with peak temperatures up to 260 °C. The 0.45 mm height and 0.25 mm lead thickness allow full wetting without tombstoning, provided stencil aperture and paste volume match the recommended 0.5 mm × 0.6 mm solder land dimensions.