onsemi BZX84C4V7_D87Z

Overview

BZX84C4V7_D87Z from ON Semiconductor is a 4.7 V ±5% Zener diode in SOT-23 package, rated for 250 mW power dissipation at 25°C ambient, with 15 Ω dynamic impedance at 20 mA test current and 3 µA maximum reverse leakage at 2.0 V, used for precision voltage regulation and overvoltage protection in low-power analog circuits.

For engineers reviewing the BZX84C4V7_D87Z datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance, dynamic impedance at specified test current, thermal resistance (R_JA = 465°C/W), reverse leakage at VR = 2.0 V, and SOT-23 footprint compatibility with space-constrained PCB layouts.

Technical Context

The BZX84C4V7_D87Z operates as a silicon planar epitaxial Zener diode optimized for stable voltage reference and clamping functions in DC bias networks and signal conditioning paths. It exhibits a negative temperature coefficient of –3.5 mV/°C at 5.0 mA and maintains regulation across –55°C to +150°C junction temperature range.

Its electrical behavior is defined under three standardized test conditions: 5.0 mA (primary regulation point), 1.0 mA (low-current stability), and 20 mA (high-current impedance measurement). Reverse leakage is specified at VR = 2.0 V, not at rated Zener voltage, reflecting real-world clamp threshold behavior.

Key Specifications

Pinout & Package

Package: SOT-23 (TO-236AB), 3-terminal surface-mount plastic package with cathode-marked lead. Standard pin assignment applies: Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = Not connected (NC) - confirmed per ON Semiconductor BZX84C series mechanical drawings and JEDEC MO-213AA outline.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ4685T1G and BZX84-C4V7,115, the BZX84C4V7_D87Z offers tighter 5% tolerance and lower 15 Ω impedance for improved regulation fidelity, while the BZX84-C4V7,115 is a packaging variant with identical electrical behavior-making it ideal for production continuity where reel logistics matter.

Availability

BZX84C4V7_D87Z is available at Aetrix Electronics and suitable for power supply rail clamp, ADC reference stabilization, ESD protection interface, and signal level translation requiring stable component supply and consistent SOT-23 footprint compliance.

Supply support for BZX84C4V7_D87Z 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 manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT applications.

The BZX84C4V7_D87Z belongs to the BZX84C series of precision Zener diodes designed for voltage regulation, reference, and protection in space-constrained, low-power electronic systems.

FAQ

What is the Zener voltage tolerance of BZX84C4V7_D87Z?

The BZX84C4V7_D87Z has a nominal Zener voltage of 4.7 V with a ±5% tolerance, meaning its actual breakdown voltage falls between 4.4 V and 5.0 V when tested at 5.0 mA. This tolerance is marked as "C" in the device family designation and is verified per ON Semiconductor's Rev. 1.10 datasheet. The BZX84C4V7_D87Z maintains this specification across its full operating temperature range of –55°C to +150°C.

What is the maximum reverse leakage current for BZX84C4V7_D87Z?

The BZX84C4V7_D87Z specifies a maximum reverse leakage current of 3 µA at V_R = 2.0 V, not at its Zener voltage. This value reflects the diode's blocking capability just below breakdown and is critical for low-power standby circuits. The BZX84C4V7_D87Z exhibits no guaranteed leakage spec at higher reverse voltages prior to conduction onset, per the official datasheet's Electrical Characteristics table.

Is BZX84C4V7_D87Z compatible with standard SOT-23 pick-and-place equipment?

Yes, the BZX84C4V7_D87Z uses the JEDEC-standard SOT-23 (TO-236AB) package with 0.95 mm pitch and defined land pattern dimensions. Its anode-cathode-NC pinout matches industry-standard SOT-23 footprints, enabling direct integration into automated assembly lines. The BZX84C4V7_D87Z has been validated for reflow compatibility with IPC-J-STD-020 moisture sensitivity level 1 and requires no special handling beyond standard SMT protocols.

How does the temperature coefficient affect BZX84C4V7_D87Z performance?

The BZX84C4V7_D87Z has a temperature coefficient of –3.5 mV/°C at 5.0 mA, meaning its Zener voltage decreases linearly with rising temperature. This negative tempco is typical for low-voltage Zeners and must be accounted for in precision reference designs. The BZX84C4V7_D87Z's drift is characterized across –55°C to +150°C, and its regulation stability remains within spec even at elevated junction temperatures up to 150°C.

Can BZX84C4V7_D87Z be used in bidirectional ESD protection?

Yes, the BZX84C4V7_D87Z supports bidirectional clamping: its forward voltage is ≤0.9 V at 10 mA, and its reverse breakdown is centered at 4.7 V. This dual-threshold behavior enables symmetric transient suppression on signal lines. The BZX84C4V7_D87Z is commonly deployed in I/O protection schemes where both positive and negative excursions must be limited, such as RS-232 or USB D+/D– lines, provided peak pulse energy stays within its 250 mW steady-state rating.