onsemi 1N6001B

Overview

1N6001B from Fairchild Semiconductor is a 5% tolerance, 11 V nominal Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C with 4.0 mW/°C derating, 18 Ω typical Zener impedance at 5 mA test current, and 0.1 mA maximum leakage current at 8.4 V reverse voltage. It provides precise voltage regulation in low-power reference and protection circuits.

For engineers reviewing the 1N6001B datasheet, pinout, applications, or equivalent options, this device serves as a stable, low-current Zener reference in analog signal conditioning, power supply feedback loops, and overvoltage clamp designs where thermal stability and tight voltage tolerance are critical.

Technical Context

The 1N6001B operates as a silicon planar Zener diode with controlled avalanche breakdown at 11 V nominal, specified under thermal equilibrium conditions at lead temperature TL = 30°C ± 1°C and 3/8″ lead length. Its 5 mA test current and 18 Ω typical dynamic impedance ensure predictable regulation across moderate load variations.

It features a DO-35 axial glass package with cathode band marking, -65°C to +200°C operating/storage temperature range, and forward voltage ≤1.2 V at 200 mA - enabling bidirectional use in clamping and reverse-biased reference applications without thermal runaway risk.

Key Specifications

Pinout & Package

DO-35 glass axial package with cathode indicated by color band; two-terminal device requiring no orientation-specific PCB layout beyond cathode/anode routing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N6001B, the 1N4740A offers lower voltage and higher surge margin but requires mechanical redesign, while the BZX55C11 matches form-factor and function closely but exhibits marginally higher dynamic impedance affecting precision at sub-mA loads.

Availability

1N6001B is available at Aetrix Electronics and suitable for power supply feedback reference, overvoltage clamp protection, and analog signal level shifting requiring stable component supply and long-term obsolescence management.

Supply support for 1N6001B 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.

The 1N6001B belongs to Fairchild's legacy 1N5985B–1N6025B Zener diode family, designed for general-purpose voltage regulation and transient suppression in cost-sensitive, high-reliability industrial and consumer power systems.

FAQ

What is the nominal Zener voltage and tolerance of the 1N6001B?

The 1N6001B has a nominal Zener voltage of 11.0 V with a guaranteed tolerance of ±5%, meaning its actual breakdown voltage falls between 10.45 V and 11.55 V when tested at 5 mA. This specification is measured under thermal equilibrium at lead temperature TL = 30°C ± 1°C with 3/8″ lead length, ensuring repeatability in production testing and design validation for the 1N6001B.

What is the maximum power dissipation and thermal derating behavior of the 1N6001B?

The 1N6001B is rated for 500 mW power dissipation at lead temperature TL ≤ 75°C, with linear derating of 4.0 mW/°C above that temperature. This means at 100°C TL, its usable power drops to 400 mW. The derating curve ensures safe operation in enclosed or high-ambient environments, and must be applied when calculating worst-case junction temperature for the 1N6001B in thermal design.

What is the Zener impedance of the 1N6001B and how does it affect regulation performance?

The 1N6001B exhibits 18 Ω typical Zener impedance (Z_Z) at 5 mA test current, which quantifies how much its output voltage changes per unit change in current. A lower Z_Z improves regulation stability - for example, a ±1 mA load variation causes only ±18 mV shift in regulated voltage. This makes the 1N6001B suitable for applications demanding tight DC accuracy, such as feedback references in switching regulators.

How is polarity identified on the 1N6001B DO-35 package?

The 1N6001B uses a cathode band - a visible painted stripe near one end of the DO-35 glass body - to identify the cathode terminal. Per standard diode convention, the cathode is the Zener breakdown terminal and must be connected to the higher-potential node in reverse-bias regulation circuits. The anode is the unmarked end and connects to ground or lower potential, ensuring correct polarity during PCB layout and hand-soldering of the 1N6001B.

What is the leakage current specification for the 1N6001B and why does it matter in high-impedance circuits?

The 1N6001B specifies maximum leakage current (I_R) of 0.1 mA at 8.4 V reverse voltage. In high-impedance applications - such as voltage dividers feeding TL431 inputs or op-amp bias networks - even small leakage currents introduce measurable offset errors. With only 0.1 mA max, the 1N6001B minimizes such errors, preserving accuracy in precision analog designs where the 1N6001B serves as a reference element.