Diodes Incorporated BZX84C3V3T-7-F

Overview

BZX84C3V3T-7-F from Diodes Incorporated is a 3.3 V, 150 mW surface-mount Zener diode in SOT-523 package, rated for 5 mA test current with 95 Ω maximum zener impedance at 5 mA and 5 µA maximum reverse leakage at 1.0 V, used for precision voltage regulation and reference in low-power analog circuits.

For engineers reviewing the BZX84C3V3T-7-F datasheet, BZX84C3V3T-7-F pinout, BZX84C3V3T-7-F application, or BZX84C3V3T-7-F equivalent, key selection criteria include nominal zener voltage tolerance (±0.2 V), thermal resistance (833 °C/W), RoHS-compliant matte tin plating, and SOT-523 footprint compatibility with space-constrained PCB layouts.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable 3.3 V across its terminals under controlled current conditions. It uses planar die construction for consistent voltage regulation and exhibits a temperature coefficient of –3.5 to 0 mV/°C at 5 mA, enabling predictable drift behavior in ambient temperature ranges from –65 °C to +150 °C.

Its 150 mW power dissipation rating is defined with FR-4 board mounting per recommended pad layout; derating begins above 25 °C ambient, reaching zero dissipation at ~150 °C. The device achieves 5 µA reverse current at VR = 1.0 V and supports fast transient response due to low junction capacitance (~15 pF typical at 3.3 V).

Key Specifications

Pinout & Package

Package: SOT-523 - ultra-small plastic surface-mount case (1.60 mm × 0.80 mm × 0.50 mm), UL 94V-0 rated, moisture sensitivity level 1, with matte tin-plated Alloy 42 leadframe.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5226BS-7-F and 1N4728A-T, BZX84C3V3T-7-F delivers optimal trade-off of miniaturization, RoHS compliance, and regulation accuracy for modern low-power embedded systems-without sacrificing thermal or electrical performance in its intended SOT-523 domain.

Availability

BZX84C3V3T-7-F is available at Aetrix Electronics and suitable for portable battery monitoring, low-power sensor reference, USB-C power negotiation, and industrial I/O module protection requiring stable component supply and full traceability.

Supply support for BZX84C3V3T-7-F 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, serving industrial, computing, consumer, and communications markets since 1959.

The BZX84 series belongs to Diodes' precision Zener portfolio designed specifically for compact, low-power voltage regulation and reference applications where size, stability, and environmental compliance are critical.

FAQ

What is the maximum reverse voltage before breakdown for BZX84C3V3T-7-F?

The device exhibits sharp reverse breakdown at 3.3 V nominal, with guaranteed regulation between 3.1 V and 3.5 V at 5 mA test current. Below 1.0 V reverse bias, leakage remains ≤5 µA; no defined "maximum non-breakdown voltage" is specified-the diode is intended for operation in its controlled zener region.

Can BZX84C3V3T-7-F be used in place of a 3.3 V LDO for powering ICs?

No-it is a shunt regulator, not a series regulator. It sinks excess current to maintain voltage, requiring a series resistor and generating heat proportional to load variation. It lacks current-limiting or dropout control, making it unsuitable as a primary power source for digital ICs but effective as a reference or clamp.

Is the SOT-523 package compatible with standard reflow profiles?

Yes-its matte tin finish and moisture sensitivity level 1 allow standard lead-free reflow (J-STD-020D-compliant), including peak temperatures up to 260 °C. Recommended pad layout is published by Diodes Inc. (AP02001.pdf) to ensure solder joint integrity and thermal relief.

Does BZX84C3V3T-7-F have a specified capacitance value?

While not explicitly listed for the 3.3 V variant, Figure 4 shows typical total capacitance of ~15 pF for 3 V-class devices at zero bias. This low capacitance supports use in high-frequency noise filtering and fast transient suppression without signal distortion.