onsemi BZX84C8V2

Overview

BZX84C8V2 from ON Semiconductor (formerly Fairchild) is a 5% tolerance, 8.2 V Zener diode in SOT-23 package, rated for 250 mW power dissipation at 25°C ambient, with typical dynamic impedance of 6 Ω at 20 mA and reverse leakage current ≤0.7 µA at 5.0 V. It provides precise voltage regulation in low-power reference and protection circuits.

For engineers reviewing the BZX84C8V2 datasheet, pinout, applications, or equivalent options, key selection factors include its 8.2 V nominal Zener voltage, ±5% tolerance, low 6 Ω impedance at 20 mA, 0.7 µA max IR at VR = 5.0 V, and SOT-23 surface-mount compatibility for space-constrained PCB designs.

Technical Context

The BZX84C8V2 operates as a silicon planar epitaxial Zener diode optimized for voltage regulation and overvoltage clamping in DC bias networks. Its junction temperature range spans –55°C to +150°C, and thermal resistance from junction-to-ambient is 465°C/W on FR-4 PCB (76.2 mm × 114.3 mm).

It exhibits a positive temperature coefficient of +3.2 mV/°C at 5.0 mA, enabling predictable drift compensation in stable reference designs. Capacitance is 135 pF at 0 V and 1 MHz, supporting moderate-frequency noise suppression without parasitic resonance concerns.

Key Specifications

Pinout & Package

Package: SOT-23 (TO-236AB), 3-terminal surface-mount plastic package with cathode-marked lead.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5238BS and 1SMA5923BT3G, the BZX84C8V2 offers optimal balance of SOT-23 footprint, 250 mW rating, and 6 Ω impedance-making it preferred for space-limited, low-power analog references where thermal mass and board area are constrained.

Availability

BZX84C8V2 is available at Aetrix Electronics and suitable for power supply references, overvoltage clamps, sensor bias networks, and current source stabilizers requiring stable component supply and consistent parametric performance across production batches.

Supply support for BZX84C8V2 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

ON Semiconductor is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The BZX84 series belongs to ON Semiconductor's general-purpose Zener diode product line, engineered for reliable voltage regulation and transient suppression in cost-sensitive, high-volume consumer and industrial electronics.

FAQ

What is the nominal Zener voltage of the BZX84C8V2?

The BZX84C8V2 has a nominal Zener voltage of 8.2 V, with a guaranteed range of 7.7 V to 8.8 V at 20 mA test current. This value is specified under standard conditions (T_A = 25°C) and reflects the device's primary function as a precision shunt regulator. The BZX84C8V2 achieves this regulation through controlled avalanche breakdown in its silicon junction.

What is the maximum power dissipation rating for the BZX84C8V2?

The BZX84C8V2 is rated for 250 mW power dissipation at an ambient temperature of 25°C when mounted on a standard FR-4 PCB (76.2 mm × 114.3 mm). Derating is required above 25°C at 0.543 mW/°C based on its 465°C/W junction-to-ambient thermal resistance. The BZX84C8V2 must not exceed its 150°C maximum junction temperature under any operating condition.

Does the BZX84C8V2 have a defined temperature coefficient?

Yes, the BZX84C8V2 has a specified temperature coefficient of +3.2 mV/°C at 5.0 mA Zener current. This positive coefficient indicates that its Zener voltage increases linearly with rising junction temperature. The BZX84C8V2's predictable drift behavior enables accurate thermal compensation in precision reference designs without additional components.

What is the reverse leakage current specification for the BZX84C8V2?

The BZX84C8V2 specifies a maximum reverse leakage current (I_R) of 0.7 µA at a reverse voltage (V_R) of 5.0 V and T_A = 25°C. This low leakage ensures minimal loading in high-impedance circuits such as sensor bias networks and voltage divider references. The BZX84C8V2 maintains this performance across its full –55°C to +150°C operating junction temperature range.

Which package type does the BZX84C8V2 use?

The BZX84C8V2 uses the SOT-23 (TO-236AB) surface-mount package, a three-terminal plastic case with cathode identification marking. Pin 1 is the anode, Pin 2 is the cathode, and Pin 3 is internally unconnected. The BZX84C8V2's SOT-23 footprint supports automated assembly and is compatible with IPC-7351B land patterns for reliable solder joint formation.