onsemi BZX84C30_D87Z

Overview

BZX84C30_D87Z from ON Semiconductor is a 30 V ±5% tolerance Zener diode in SOT-23 package, rated for 250 mW power dissipation at 25°C ambient, with typical zener impedance of 50 Ω at 20 mA and reverse leakage current ≤50 nA at 21 V, used for precision voltage regulation and overvoltage protection in low-power analog circuits.

For engineers reviewing the BZX84C30_D87Z datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, dynamic impedance at specified test current, thermal resistance (R_JA = 465°C/W), junction temperature range (–55°C to +150°C), and SOT-23 footprint compatibility in space-constrained designs.

Technical Context

This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown when cathode-to-anode voltage exceeds its nominal 30 V zener voltage. It is characterized at three test currents (1 mA, 5 mA, 20 mA) to specify minimum/maximum V_Z and dynamic impedance (Z_Z).

Thermal performance is defined by junction-to-ambient (R_JA = 465°C/W) and junction-to-lead (R_JL = 220°C/W) resistances under FR-4 PCB mounting conditions (76.2 mm × 114.3 mm). Capacitance is 70 pF at 0 V reverse bias and 1 MHz.

Key Specifications

Pinout & Package

SOT-23 plastic surface-mount package with gull-wing leads; cathode marked by band on top surface; standard pin assignment per JEDEC TO-236AB.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5260BLT1G, BZX84C30_D87Z offers lower capacitance (70 pF vs. 100 pF) for better high-frequency clamping, while BZX84-C30,115 provides identical electrical specs with automotive qualification-making it preferable for vehicle electronics where reliability certification is mandatory.

Availability

BZX84C30_D87Z is available at Aetrix Electronics and suitable for overvoltage protection, precision reference generation, and power rail monitoring requiring stable component supply in industrial automation, sensor interface modules, and embedded control units.

Supply support for BZX84C30_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 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 discrete Zener diode product line, engineered for high-reliability voltage regulation and transient suppression in compact, cost-sensitive PCB layouts.

FAQ

What is the nominal zener voltage and tolerance of BZX84C30_D87Z?

The BZX84C30_D87Z has a nominal zener voltage of 30 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 28.0 V and 32.4 V when tested at 20 mA. This tolerance is confirmed in the Electrical Characteristics table of the official ON Semiconductor datasheet Rev. 1.10, and applies across the full operating temperature range of –55°C to +150°C. The BZX84C30_D87Z maintains this specification under standard JEDEC test conditions.

What is the maximum power dissipation for BZX84C30_D87Z at room temperature?

The BZX84C30_D87Z is rated for 250 mW power dissipation at an ambient temperature of 25°C, as specified in the Absolute Maximum Ratings table. This value assumes mounting on a standard FR-4 PCB (76.2 mm × 114.3 mm). Derating is required above 25°C at 2.15 mW/°C based on its R_JA of 465°C/W. The BZX84C30_D87Z must not exceed this limit to ensure long-term reliability and avoid thermal runaway.

Does BZX84C30_D87Z have a specified zener impedance, and at what test current?

Yes, the BZX84C30_D87Z has a maximum zener impedance (Z_Z) of 50 Ω when measured at a test current of 20 mA, as documented in the Electrical Characteristics table. At 5 mA, Z_Z is 80 Ω max, and at 1 mA it is 300 Ω max. These values directly impact regulation accuracy under varying load conditions. The BZX84C30_D87Z uses these standardized test points to enable consistent design-in across applications.

What is the reverse leakage current specification for BZX84C30_D87Z?

The BZX84C30_D87Z exhibits a maximum reverse leakage current (I_R) of 50 nA when subjected to a reverse voltage of 21 V, per the datasheet's Electrical Characteristics table. This low leakage ensures minimal parasitic current draw in high-impedance reference or protection circuits. The BZX84C30_D87Z maintains this performance across its full storage temperature range and supports ultra-low-power system design.

Which package type does BZX84C30_D87Z use, and how are its terminals arranged?

The BZX84C30_D87Z uses the SOT-23 surface-mount package with three terminals: Pin 1 (anode), Pin 2 (cathode), and Pin 3 (anode, internally tied to Pin 1). The cathode is marked by a band on the top surface. This configuration complies with JEDEC TO-236AB and is compatible with standard pick-and-place and reflow processes. The BZX84C30_D87Z shares this mechanical and thermal footprint with other members of the BZX84 family.