Diodes Incorporated BZX84C2V4W-7

Overview

BZX84C2V4W from Diodes Incorporated is a 2.4 V, 200 mW surface-mount Zener diode in SOT-323 package, with nominal zener voltage 2.4 V (min 2.2 V, max 2.6 V at 5 mA), zener impedance ≤100 Ω at 5 mA, and reverse current ≤50 µA at 1.0 V, used for precision voltage reference and overvoltage protection in low-power analog circuits.

For engineers reviewing the BZX84C2V4W datasheet, BZX84C2V4W pinout, BZX84C2V4W application, or BZX84C2V4W equivalent, key selection criteria include zener voltage tolerance (±0.2 V), low thermal resistance (625 K/W), ultra-small footprint (SOT-323), RoHS-compliant matte tin plating, and temperature coefficient (–3.5 to 0 mV/°C) for stable biasing in portable instrumentation.

Technical Context

This Zener diode operates in reverse breakdown mode with tightly controlled voltage regulation at I_ZT = 5 mA. Its planar die construction ensures repeatable breakdown characteristics and low leakage across –65 °C to +125 °C operating range.

It exhibits a negative temperature coefficient (–3.5 to 0 mV/°C) typical of low-voltage Zeners (<5 V), requiring thermal-aware layout on FR4 boards. Power derating begins above 25 °C ambient per the defined 625 K/W R_θJA, limiting usable dissipation to 100 mW at 75 °C.

Key Specifications

Pinout & Package

Package: SOT-323 - ultra-small plastic surface-mount case with lead-free matte tin plating over Alloy 42 leadframe; polarity indicated by cathode band on top view.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5221BS-7-F, BZX84C2V4W offers lower zener impedance for tighter regulation; versus 1N4733A-TAP, it provides SMT compatibility, 2.4 V targeting, and optimized low-power operation - making it superior for modern miniaturized analog subsystems.

Availability

BZX84C2V4W is available at Aetrix Electronics and suitable for portable sensor biasing, USB peripheral voltage clamping, and low-power MCU reset circuits requiring stable component supply with full traceability and lifecycle support.

Supply support for BZX84C2V4W 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.

The BZX84 series belongs to Diodes' precision Zener reference product line, engineered specifically for low-voltage, low-power voltage regulation and protection in space-constrained portable and industrial electronics.

FAQ

What is the maximum reverse voltage this Zener can regulate without damage?

The BZX84C2V4W is rated for continuous operation up to its nominal 2.4 V zener voltage at 5 mA. It withstands peak reverse voltages up to 2.6 V (max specified V_Z) without degradation. Exceeding 2.6 V continuously risks thermal runaway due to its 200 mW power limit and 625 K/W thermal resistance - sustained operation above this requires active current limiting.

Can this device be used in series with another Zener for higher reference voltage?

Yes, BZX84C2V4W may be cascaded in series to achieve higher reference voltages, but total power dissipation must remain within 200 mW per device. Series connection increases effective zener impedance and temperature coefficient nonlinearity; for stable multi-Zener references, use matched units from the same wafer lot and verify thermal coupling in layout.

Is the SOT-323 package compatible with standard reflow profiles?

Yes - the SOT-323 package uses matte tin-plated leads and meets J-STD-020D moisture sensitivity Level 1, allowing direct placement onto PCBs without pre-baking. It supports standard lead-free reflow profiles (peak 260 °C, 60-second duration) when using recommended pad layout per Diodes AP02001.

How does the temperature coefficient affect long-term stability in outdoor deployments?

With a TC of –3.5 to 0 mV/°C, BZX84C2V4W drifts up to –0.84 mV/°C at mid-range ambient temperatures. Over a –40 to +85 °C range, this yields up to ±105 mV total shift - acceptable for non-critical biasing but insufficient for metrology-grade references; external compensation or calibration is required for sub-0.1% accuracy.