onsemi 1N960B_T50A

Overview

1N960B_T50A from Fairchild Semiconductor is a 9.1 V ±5% Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C with 14 Ω zener impedance at 7.5 mA, used for precision voltage regulation and reference in low-power analog circuits.

For engineers reviewing the 1N960B_T50A datasheet, pinout, applications, or equivalent options, key selection criteria include nominal zener voltage (9.1 V), tolerance (±5%), dynamic impedance (14 Ω @ 7.5 mA), maximum reverse leakage (0.5 μA @ 6.9 V), and thermal derating (4.0 mW/°C above 75°C).

Technical Context

The 1N960B_T50A operates as a silicon planar Zener diode with sharp reverse breakdown characteristics, optimized for stable DC voltage reference in bias networks, overvoltage clamping, and feedback sensing. Its 9.1 V nominal zener voltage falls within the mid-range of the 1N957B–1N979B family and exhibits low dynamic impedance (14 Ω) and tight 5% tolerance.

Designed for operation at junction temperatures from –65°C to +200°C, it maintains specified electrical performance under lead temperature conditions up to 75°C, with linear derating beyond that point. The DO-35 glass package ensures hermetic sealing and compatibility with standard axial-leaded PCB assembly processes.

Key Specifications

Pinout & Package

DO-35 glass axial package with cathode indicated by color band; two-terminal device requiring no orientation-specific PCB footprint beyond standard axial lead spacing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N960B_T50A, 1N4739A offers higher power margin at the cost of larger DO-41 footprint and different test current, while BZX55C9V1 matches voltage, tolerance, and package but uses 5 mA test current and alternate qualification-both require validation for leakage and impedance matching in precision reference designs.

Availability

1N960B_T50A is available at Aetrix Electronics and suitable for power supply reference, overvoltage protection, and analog biasing applications requiring stable component supply, consistent parametric performance, and long-term obsolescence management.

Supply support for 1N960B_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 devices before its acquisition by ON Semiconductor in 2016.

The 1N957B–1N979B series was designed for general-purpose precision voltage regulation in cost-sensitive, high-reliability analog and power circuits, emphasizing tight tolerance, low impedance, and wide temperature operation.

FAQ

What is the nominal zener voltage and tolerance of the 1N960B_T50A?

The 1N960B_T50A has a nominal zener voltage of 9.1 V with a tolerance of ±5%, measured at a test current of 7.5 mA and lead temperature of 30°C ± 1°C. This specification ensures predictable regulation behavior across manufacturing lots and supports accurate voltage referencing in analog circuits where stability is critical. The 1N960B_T50A maintains this tolerance under defined thermal and current conditions per Fairchild's Rev. F1 datasheet.

What is the maximum power dissipation and thermal derating for the 1N960B_T50A?

The 1N960B_T50A is rated for 500 mW power dissipation at lead temperature (T_L) ≤ 75°C with 3/8″ lead length. Above 75°C, power must be linearly derated at 4.0 mW/°C. This derating ensures safe junction temperature operation up to +200°C. The 1N960B_T50A's thermal limits are defined in the Absolute Maximum Ratings table of the Fairchild datasheet and apply regardless of mounting method or airflow.

What is the zener impedance of the 1N960B_T50A and why does it matter?

At 7.5 mA test current, the 1N960B_T50A exhibits a zener impedance (Z_Z) of 14 Ω. This value quantifies how much the output voltage changes with variations in current-lower impedance means better regulation under dynamic load conditions. In practice, the 1N960B_T50A's 14 Ω Z_Z helps maintain voltage stability in feedback loops and reference dividers where load current may fluctuate. The 1N960B_T50A's impedance is measured at 60 Hz with ac current equal to 10% of dc test current.

How is the cathode identified on the 1N960B_T50A package?

The cathode of the 1N960B_T50A is marked by a distinct color band on the DO-35 glass body, consistent with industry-standard polarity identification for axial-leaded Zener diodes. This band aligns with the "B" suffix in the top-marking sequence (LOGO / 60 / B), confirming cathode orientation. During PCB layout, the banded end must connect to the higher-potential node when used in reverse-bias regulation mode. The 1N960B_T50A's marking follows Fairchild's specification requiring vertical alignment of all three lines and 20% taller logo height.

What are the operating and storage temperature limits for the 1N960B_T50A?

The 1N960B_T50A supports an operating and storage temperature range of –65°C to +200°C, as specified in the Absolute Maximum Ratings table. This wide range enables use in extended-environment applications such as industrial controls, automotive under-hood modules, and aerospace subsystems where thermal extremes are expected. The 1N960B_T50A's performance parameters-including V_Z, Z_Z, and I_R-are characterized at 25°C but remain functional across the full range, with appropriate derating applied per datasheet guidelines.