Taiwan Semiconductor Corporation BZX85C10

Overview

BZX85C10 from Taiwan Semiconductor is a 10 V ±5% Zener diode in DO-41 package, rated for 1.3 W power dissipation and operating up to +200°C junction temperature. It provides stable voltage regulation in low-power DC/DC converters, adapter circuits, and lighting control systems with 9.4–10.6 V nominal Zener voltage at 7 mA test current.

For engineers reviewing the BZX85C10 datasheet, BZX85C10 pinout, BZX85C10 application, or BZX85C10 equivalent, key selection criteria include its 200 Ω maximum Zener impedance at 7 mA, 0.5 µA leakage at 7.5 V reverse bias, and hermetically sealed glass DO-41 construction suitable for industrial-grade voltage reference designs.

Technical Context

The BZX85C10 operates as a single-die, silicon planar Zener diode optimized for precision voltage clamping and reference functions in linear regulator feedback paths and overvoltage protection circuits. Its 1.3 W power rating and 130 °C/W junction-to-ambient thermal resistance define its continuous dissipation capability under natural convection.

It features ±5% tolerance on nominal 10 V Zener voltage, tested under 10 ms pulse conditions, with specified Zener impedance derived from AC superposition at 10% of DC test current. The cathode band marking and pure tin-plated leads comply with J-STD-002 solderability standards.

Key Specifications

Pinout & Package

DO-41 axial-leaded glass package with cathode indicated by a painted band; leads are pure tin-plated and solderable per J-STD-002. Total weight ≈242 mg.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4740A and MMSZ5240B, the BZX85C10 offers superior power handling (1.3 W) and high-temperature capability (+200°C), making it preferred for industrial adapters and enclosed lighting drivers where thermal derating and reliability are critical.

Availability

BZX85C10 is available at Aetrix Electronics and suitable for low-voltage stabilizers, on-board DC/DC converters, and lighting applications requiring stable component supply across industrial production cycles.

Supply support for BZX85C10 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

Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global industrial and consumer markets since 1979.

The BZX85C series belongs to TSC's general-purpose Zener diode product line, engineered for robust voltage reference and clamping in cost-sensitive, thermally demanding applications such as power adapters and lighting ballasts.

FAQ

What is the Zener voltage tolerance for BZX85C10?

The BZX85C10 has a nominal Zener voltage of 10 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 9.4 V and 10.6 V when measured at 7 mA test current under pulse conditions. This tolerance is standardized across the BZX85C family and confirmed in Taiwan Semiconductor's H2301 datasheet revision.

What is the maximum power dissipation of BZX85C10?

The BZX85C10 is rated for 1.3 W maximum power dissipation at 25°C ambient temperature. Its junction-to-ambient thermal resistance is 130 °C/W, so derating is required above 25°C - for example, at 75°C ambient, usable power drops to approximately 0.85 W. This rating applies only with adequate PCB copper area or airflow.

Is BZX85C10 RoHS compliant?

Yes, the BZX85C10 is RoHS compliant per Taiwan Semiconductor's documentation. It uses lead-free, green compound encapsulation and pure tin-plated leads meeting J-STD-002 solderability requirements. Compliance is verified in the H2301 datasheet and applies to all standard ordering codes (e.g., BZX85C10 R0G and A0G).

What package type does BZX85C10 use?

The BZX85C10 is supplied in the DO-41 axial-leaded glass package, measuring Ø2.80 mm body diameter and 5.20 mm lead spacing. The cathode is marked by a painted band, and the device weighs approximately 242 mg. Mechanical dimensions are fully specified in TSC's HQ2SD07-DO41-059 REV A drawing.

What is the leakage current specification for BZX85C10?

The BZX85C10 exhibits a maximum leakage current of 0.5 µA at a reverse voltage of 7.5 V (75% of nominal V_Z). This value is measured at 25°C and reflects the device's ability to maintain high-impedance behavior below breakdown - critical for precision reference and low-power biasing applications.