Diodes Incorporated BZX84C4V3T-7-F

Overview

BZX84C4V3T-7-F from Diodes Incorporated is a 4.3 V, 150 mW surface-mount Zener diode in SOT-523 package, rated for 5 mA test current with ±0.3 V tolerance (4.0–4.6 V), 90 Ω dynamic impedance at 5 mA, and maximum 3.0 µA reverse leakage at 1.0 V. It provides precision voltage reference and overvoltage protection in space-constrained power management circuits.

For engineers reviewing the BZX84C4V3T-7-F datasheet, BZX84C4V3T-7-F pinout, BZX84C4V3T-7-F application, or BZX84C4V3T-7-F equivalent, key selection criteria include zener voltage accuracy at 5 mA, thermal resistance (833 °C/W), SOT-523 footprint compatibility, RoHS-compliant matte tin plating, and low reverse leakage under bias.

Technical Context

This Zener diode operates in reverse breakdown to maintain stable voltage regulation across load and line variations. Its planar die construction ensures consistent breakdown characteristics and low noise performance, with temperature coefficient of –3.5 to 0 mV/°C at 5 mA.

The device is characterized at 25 °C with short-duration pulse testing to minimize self-heating effects, and its power derating curve specifies linear reduction above 25 °C ambient-down to zero dissipation at 150 °C junction temperature.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ4685T-7-F and BZX84-C4V3,115, BZX84C4V3T-7-F uniquely balances ultra-compact SOT-523 size, RoHS compliance, and verified 4.3 V regulation stability-making it optimal for next-gen portable and IoT endpoints where footprint and regulatory alignment are non-negotiable.

Availability

BZX84C4V3T-7-F is available at Aetrix Electronics and suitable for portable power monitoring, USB-C overvoltage clamp, and industrial sensor signal conditioning requiring stable component supply and guaranteed long-term sourcing.

Supply support for BZX84C4V3T-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, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The BZX84 series belongs to Diodes' precision Zener diode product line, engineered specifically for voltage reference, regulation, and overvoltage protection in space- and power-constrained applications across consumer, industrial, and communications end markets.

FAQ

What is the maximum reverse voltage this Zener can sustain before breakdown?

The BZX84C4V3T-7-F has a nominal zener voltage of 4.3 V with a specified range of 4.0–4.6 V at 5 mA test current. Breakdown occurs sharply within this range; operation below 4.0 V results in negligible conduction, while sustained reverse bias above 4.6 V risks exceeding power limits unless current is strictly limited by external series resistance.

Can this device be used in parallel for higher power dissipation?

No-Zener diodes exhibit manufacturing variations in breakdown voltage, causing current hogging when paralleled. Even matched units require balancing resistors, which defeat the purpose of compact regulation. For >150 mW needs, select a single higher-power Zener like the 500 mW BZX85C4V3 in DO-35 or use an active shunt regulator.

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

Yes-the SOT-523 package is qualified for lead-free reflow per J-STD-020D Level 1 moisture sensitivity. Its matte tin plating ensures reliable wetting at peak temperatures up to 260 °C, and the small thermal mass allows uniform heating without tombstoning when using IPC-7351-compliant land patterns.

Does this Zener diode have a specified capacitance value?

No specific capacitance is listed in the DS30262 datasheet for BZX84C4V3T-7-F. However, Figure 4 shows typical total capacitance ≈15 pF for 4.3 V nominal devices. This value is derived from empirical measurement across the BZX84C2V4T–BZX84C39T family and applies under zero-bias conditions.