Diodes Incorporated BZX84C2V4W-7-F

Overview

BZX84C2V4W-7-F from Diodes Incorporated is a 2.4 V, 5 mA nominal Zener diode in SOT-323 package, rated for 200 mW power dissipation and ±0.2 V zener voltage tolerance at 25°C, with 100 Ω maximum zener impedance at test current and -3.5 to 0 mV/°C temperature coefficient - used for precision low-voltage reference and overvoltage clamping in portable power rails.

For engineers reviewing the BZX84C2V4W-7-F datasheet, BZX84C2V4W-7-F pinout, BZX84C2V4W-7-F application, or BZX84C2V4W-7-F equivalent, key selection criteria include zener voltage stability at low current (1.0 mA knee current), ultra-small footprint for space-constrained PCBs, RoHS-compliant matte tin plating, and thermal resistance of 625 K/W on FR4 board.

Technical Context

This Zener diode operates in reverse breakdown mode with a nominal zener voltage of 2.4 V at 5.0 mA test current, exhibiting a tight 2.2–2.6 V range and a negative temperature coefficient (-3.5 to 0 mV/°C). Its 100 Ω dynamic impedance at I_ZT ensures stable regulation under small-signal load variations.

The device uses planar die construction in a molded plastic SOT-323 case rated UL 94V-0, with moisture sensitivity level 1 and a 0.006 g mass. It supports forward conduction (V_F = 0.9 V @ 10 mA) and reverse leakage (I_R = 50 µA @ 1.0 V) per JEDEC-standard test conditions.

Key Specifications

Pinout & Package

SOT-323 surface-mount package: 3-terminal, single-diode configuration with anode, cathode, and case (non-connected). Dimensions: 2.20 × 1.35 × 0.90 mm (L × W × H), weight 0.006 g, UL 94V-0 flammability rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5221BS-7-F and 1SMA5913BT3G, BZX84C2V4W-7-F delivers optimal balance of ultra-compact size, precise low-current regulation, and cost-effective RoHS compliance - making it preferred for consumer electronics and portable medical devices where PCB real estate and quiescent power are constrained.

Availability

BZX84C2V4W-7-F is available at Aetrix Electronics and suitable for USB power management, microcontroller reference design, EEPROM protection, and Li-ion battery monitoring requiring stable component supply and full traceability.

Supply support for BZX84C2V4W-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' standard Zener diode product line, engineered specifically for cost-sensitive, high-volume applications demanding tight voltage tolerance, low-profile packaging, and full environmental compliance.

FAQ

What is the maximum reverse voltage (V_R) that BZX84C2V4W-7-F can block before breakdown?

The device does not specify a discrete "blocking" voltage; its zener breakdown begins gradually at ~1.8 V and reaches nominal 2.4 V regulation at 5 mA. At 1.0 V reverse bias, leakage is guaranteed ≤50 µA - confirming effective blocking below the knee region. Operation above 2.6 V risks exceeding the specified 200 mW dissipation limit unless current is strictly limited.

Can BZX84C2V4W-7-F be used in forward-bias mode like a standard diode?

Yes - it exhibits 0.9 V forward voltage at 10 mA, matching typical silicon diode behavior. However, its primary design intent is reverse-bias zener operation. Forward conduction is characterized only for polarity verification and ESD path modeling, not for rectification duty cycles or high-current switching.

Is the SOT-323 package of BZX84C2V4W-7-F compatible with standard reflow profiles?

Yes - rated for moisture sensitivity Level 1 per J-STD-020D, it withstands standard Pb-free reflow (peak 260°C, 60 sec max) without preconditioning. The matte tin finish ensures reliable wetting on OSP- and ENIG-finished PCBs, and the 0.006 g mass minimizes tombstoning risk in fine-pitch placement.

How does the -3.5 mV/°C temperature coefficient affect accuracy in a 0–70°C ambient range?

Over 0–70°C, the zener voltage shifts by up to -245 mV (70 × -3.5 mV/°C), resulting in a worst-case V_Z of ~2.155 V. For precision references, this drift must be compensated via circuit design (e.g., using complementary tempcos) or restricted to narrower ambient bands where drift remains <±10 mV.