onsemi BZX85C15TR5K

Overview

BZX85C15TR5K from onsemi is a 15 V, 1.0 W axial-leaded Zener diode in DO−41 package, with zener voltage tolerance ±5% (13.8 V to 15.6 V), zener impedance 15 Ω at 15 mA test current, and leakage current ≤0.5 μA at 10.5 V reverse bias - used for precision voltage regulation in power supply feedback loops and overvoltage protection circuits.

For engineers reviewing the BZX85C15TR5K datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage accuracy, power derating above 50°C (6.67 mW/°C), thermal junction range (−65°C to +200°C), and DO−41 mechanical compatibility with through-hole PCB layouts.

Technical Context

This device operates as a silicon planar passivated Zener diode optimized for stable voltage reference and clamping in DC power rails. It maintains regulation across 15 mA nominal test current with low dynamic impedance (15 Ω) and tight voltage spread (±5%), enabling predictable threshold behavior in analog sensing and feedback networks.

The DO−41 glass-encapsulated axial package supports lead temperature-controlled measurement per JEDEC DO−204AL, with thermal derating applied above 50°C and full operational capability up to +200°C junction temperature - critical for industrial and automotive under-hood applications.

Key Specifications

Pinout & Package

DO−41 axial-leaded glass package (Case 017AH), 2-terminal unidirectional device with cathode band marking. Leads are tinned copper-clad steel; body diameter 2.03–2.72 mm, length ≥25.40 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4744A and BZX85C15-TR, the BZX85C15TR5K delivers identical 15 V regulation performance but uses fan-fold tape (T50A) - making it optimal for semi-automated insertion while maintaining full interchangeability in voltage-setting and clamping roles.

Availability

BZX85C15TR5K is available at Aetrix Electronics and suitable for switch-mode power supplies, automotive overvoltage protection, industrial sensor biasing, and precision ADC reference circuits requiring stable component supply and long-lifecycle support.

Supply support for BZX85C15TR5K 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT markets.

The BZX85C15TR5K belongs to the BZX85C series of general-purpose Zener diodes designed for reliable voltage regulation and transient suppression in cost-sensitive, high-volume power management applications.

FAQ

What is the nominal Zener voltage and tolerance of BZX85C15TR5K?

The BZX85C15TR5K has a nominal Zener voltage of 15 V with a tolerance of ±5%, resulting in a guaranteed range of 13.8 V to 15.6 V at 15 mA test current. This specification is measured under controlled thermal conditions (lead temperature 30°C ±1°C) and is validated per the onsemi datasheet Rev. 4. The BZX85C15TR5K achieves this accuracy using planar passivation and glass encapsulation for long-term stability.

What package type and mounting style does BZX85C15TR5K use?

BZX85C15TR5K uses the DO−41 axial-leaded package (Case 017AH), a through-hole glass-encapsulated form factor with 2.03–2.72 mm body diameter and ≥25.40 mm length. It is designed for manual or wave-solder mounting with 3/8″ lead length standard. The cathode is marked by a visible band, and the device complies with JEDEC DO−204AL mechanical specifications.

How does thermal derating apply to BZX85C15TR5K in high-temperature environments?

BZX85C15TR5K must be derated linearly at 6.67 mW/°C above 50°C ambient temperature to maintain safe junction operation within its −65°C to +200°C range. At 75°C ambient, maximum allowable power drops to 0.833 W. This derating ensures junction temperature stays below 200°C under continuous DC stress and is critical for reliability in enclosed industrial enclosures or under-hood automotive locations.

Can BZX85C15TR5K replace BZX85C15-T50R in a design?

Yes - BZX85C15TR5K and BZX85C15-T50R share identical electrical specifications, DO−41 package, and thermal characteristics; the only difference is packaging format (fan-fold tape vs. tape-and-reel). No circuit or layout changes are needed. BZX85C15TR5K is functionally interchangeable with BZX85C15-T50R in all voltage regulation and clamping applications.

What is the maximum leakage current for BZX85C15TR5K and at what reverse voltage is it specified?

The maximum leakage current for BZX85C15TR5K is 0.5 μA, specified at a reverse voltage (V_R) of 10.5 V. This value is measured at T_A = 25°C and reflects the device's ability to minimize parasitic current draw in high-impedance bias networks - a key parameter for precision sensor interfaces and low-power standby circuits using the BZX85C15TR5K.