Diodes Incorporated BZX84C3V0W-7

Overview

BZX84C3V0W-7 from Diodes Incorporated is a 3.0 V, 200 mW surface-mount Zener diode in SOT-323 package, specified at 5 mA test current with ±0.2 V tolerance (2.8–3.2 V), 95 Ω dynamic impedance at 5 mA, and -3.5 to 0 mV/°C temperature coefficient. It provides precise low-voltage regulation in power supply feedback paths and voltage reference circuits.

For engineers reviewing the BZX84C3V0W-7 datasheet, BZX84C3V0W-7 pinout, BZX84C3V0W-7 application, or BZX84C3V0W-7 equivalent, key selection criteria include nominal Zener voltage accuracy, thermal coefficient stability across -65°C to +125°C, low dynamic impedance for ripple suppression, and SOT-323 footprint compatibility in space-constrained PCB layouts.

Technical Context

This Zener diode operates in reverse breakdown mode with a nominal 3.0 V regulation voltage at I_ZT = 5 mA. Its planar die construction ensures stable voltage characteristics and low leakage, with maximum reverse current of 20 µA at 1.0 V and 1.0 µA at VR = 1.0 V.

Thermal resistance is 625 K/W (junction-to-ambient, FR4 board), limiting continuous power dissipation to 200 mW at 25°C ambient. Derating begins above 25°C per the published curve, reaching zero dissipation at ~150°C case temperature.

Key Specifications

Pinout & Package

Package: SOT-323 - ultra-small plastic surface-mount case (2.0 × 1.25 × 0.9 mm), RoHS-compliant, matte tin-plated leads, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5226BS-7-F and 1N4728A-T, BZX84C3V0W-7 offers optimal balance of tight 3.0 V regulation, ultra-compact SOT-323 fit, and industrial-grade temperature stability - making it preferred for new space- and power-constrained designs.

Availability

BZX84C3V0W-7 is available at Aetrix Electronics and suitable for USB power monitoring, IoT sensor biasing, industrial PLC input protection, and automotive body control modules requiring stable component supply with consistent parametric performance.

Supply support for BZX84C3V0W-7 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 and manufacturing operations across Asia and the Americas.

This device belongs to the BZX84C series of surface-mount Zener diodes engineered for precision voltage regulation and reference applications in consumer, industrial, and automotive electronics.

FAQ

What is the maximum reverse voltage before breakdown for BZX84C3V0W-7?

The nominal Zener voltage is 3.0 V at 5 mA test current, with guaranteed breakdown occurring between 2.8 V and 3.2 V. Below 2.8 V, reverse current remains ≤20 µA at 1.0 V; no hard "maximum reverse voltage" is defined - operation below V_Z(min) is non-regulating but safe.

Can BZX84C3V0W-7 be used in place of a 3.3 V Zener diode?

No - its specified regulation range is 2.8–3.2 V, not 3.3 V. Substituting it for a 3.3 V part (e.g., BZX84C3V3W) risks undershooting required reference voltage by up to 0.3 V, potentially causing ADC scaling errors or undervoltage lockout in regulators.

Is thermal derating required for operation above 25°C ambient?

Yes - the datasheet specifies linear derating from 200 mW at 25°C to zero at ~150°C. For example, at 85°C ambient, maximum allowable power drops to approximately 120 mW. This must be calculated using R_θJA = 625 K/W and actual board layout.

Does BZX84C3V0W-7 have a specified capacitance value?

No specific capacitance is listed in the datasheet for this variant. However, Figure 4 shows typical total capacitance for 3.0 V Zeners is ~450 pF at 1 V reverse bias and 25°C - consistent with other BZX84C devices in the 2.4–3.9 V range.