onsemi 1N6015B_T50A

Overview

1N6015B_T50A from Fairchild Semiconductor is a 43 V ±5% Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C with 4.0 mW/°C derating, 2 mA test current, and 150 Ω zener impedance at IZ; used for precision voltage regulation in low-power analog reference and overvoltage protection circuits.

For engineers reviewing the 1N6015B_T50A datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, thermal derating behavior, leakage current at 33 V (0.1 mA), and DO-35 mechanical compatibility in space-constrained PCB layouts.

Technical Context

This Zener diode operates in reverse breakdown mode with a nominal zener voltage of 43 V at 2 mA test current, maintaining regulation across junction temperatures from –65°C to +200°C. Its 150 Ω dynamic impedance at IZ and 900 Ω knee impedance at 250 μA define voltage stability under varying load and low-current conditions.

The device uses a glass-passivated DO-35 axial package with cathode band marking, supporting lead-forming for through-hole mounting. Power handling is thermally limited by lead temperature (TL), not ambient, requiring 3/8″ lead length for rated 500 mW operation and linear derating above 75°C.

Key Specifications

Pinout & Package

DO-35 glass axial package with cathode indicated by a single color band on the body; leads are tinned copper alloy, suitable for wave or hand soldering. Mechanical dimensions conform to JEDEC DO-35 standard: 1.8–2.2 mm diameter, 4.0–5.0 mm body length, 25.4 mm minimum lead length.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N6015B_T50A, 1N6015BRLG offers identical performance with certified environmental compliance, while BZX55-C43 provides functional equivalence at higher dynamic impedance-making the original 1N6015B_T50A optimal for precision low-impedance references where thermal stability and tight V_Z distribution are prioritized.

Availability

1N6015B_T50A is available at Aetrix Electronics and suitable for industrial sensor reference, automotive ECU clamp, and medical instrument bias applications requiring stable component supply, consistent parametric binning, and long-term manufacturing continuity.

Supply support for 1N6015B_T50A 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

Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016; known for rugged, high-reliability devices in automotive and industrial markets.

The 1N6015B_T50A belongs to Fairchild's legacy 1N5985B–1N6025B Zener diode family, engineered for stable voltage reference and transient suppression in harsh-environment electronics where thermal resilience and parameter consistency are critical.

FAQ

What is the exact zener voltage tolerance for 1N6015B_T50A?

The 1N6015B_T50A has a guaranteed zener voltage tolerance of ±5% around its nominal 43 V rating, measured at 2 mA test current and 25°C junction temperature. This means the actual V_Z falls between 40.85 V and 45.15 V per unit, enabling predictable clamping behavior in production designs without calibration.

Can 1N6015B_T50A be used in surface-mount designs?

No, the 1N6015B_T50A is packaged exclusively in the through-hole DO-35 glass axial case and lacks SMD-compatible variants. It requires axial lead insertion and wave/hand soldering. For surface-mount equivalents, consider SOD-123 or SOD-323 packaged Zeners like MMBZ5243B, but note that those differ in V_Z, power rating, and thermal behavior from the 1N6015B_T50A.

What is the maximum allowable reverse voltage before significant leakage in 1N6015B_T50A?

The 1N6015B_T50A exhibits 0.1 mA leakage current at V_R = 33 V, which is 77% of its nominal 43 V rating. Below this voltage, leakage remains sub-μA; operation up to 33 V is safe for standby biasing. Exceeding 33 V increases leakage exponentially and risks premature breakdown outside specified test conditions.

How does thermal derating work for 1N6015B_T50A in high-temperature environments?

The 1N6015B_T50A derates linearly at 4.0 mW/°C above a lead temperature of 75°C. For example, at TL = 100°C, maximum allowable power drops to 500 mW − (100 − 75) × 4.0 = 400 mW. This derating applies to lead temperature-not ambient-and assumes 3/8″ lead length; shorter leads reduce thermal capacity and require additional margin.

Is 1N6015B_T50A suitable for use in life-support equipment?

No. Per Fairchild's Life Support Policy, the 1N6015B_T50A is not authorized for use as a critical component in life-support devices or systems. Its qualification level does not meet the fault-tolerance, traceability, or audit requirements mandated for surgical implants or systems sustaining human life; alternative components with explicit life-support certification must be selected instead.