onsemi KSB1116AGBU

Overview

KSB1116AGBU from Fairchild Semiconductor is a PNP epitaxial silicon transistor designed for audio frequency power amplification and medium-speed switching applications. It features V_CEO = −60 V, I_C = −1 A (DC), P_C = 0.75 W, h_FE = 135–400 (depending on grade), and TO-92 package - commonly used in low-power audio output stages and relay drivers.

For engineers reviewing the KSB1116AGBU datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed h_FE classification (G-grade), V_CE(sat) ≤ −0.3 V at I_C = −1 A / I_B = −50 mA, f_T ≥ 70 MHz, and complementary pairing with KSD1616AGBU in push-pull amplifier designs.

Technical Context

This PNP bipolar junction transistor operates with reverse-polarity biasing: collector and emitter voltages are negative relative to base. Its DC current gain (h_FE) is specified across two test conditions - h_FE1 at V_CE = −2 V, I_C = −100 mA (135–400) and h_FE2 at V_CE = −2 V, I_C = −1 A (81–600) - enabling stable gain control in both small-signal preamplifier and medium-current switching roles.

Switching performance is characterized by t_ON = 0.07 µs, t_STG = 0.7 µs, and t_F = 0.07 µs under defined pulse conditions (V_CC = −10 V, I_C = −100 mA, I_B1 = I_B2 = −10 mA), supporting operation up to several hundred kHz in saturated-switch configurations.

Key Specifications

Pinout & Package

Package: TO-92 (3-lead plastic through-hole). Standard lead configuration: Pin 1 = Emitter, Pin 2 = Collector, Pin 3 = Base - verified per Fairchild's mechanical drawing Rev. A2.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP bipolar transistor applications.

Compared with MJD112G and BC639, the KSB1116AGBU uniquely balances TO-92 form factor, −1 A DC current, 70+ MHz f_T, and factory-binned h_FE - making it optimal for space-constrained, medium-power audio and switching applications where thermal and bandwidth trade-offs must be tightly controlled.

Availability

KSB1116AGBU is available at Aetrix Electronics and suitable for audio power amplifiers, relay drivers, DC motor controllers, and LED current sinks requiring stable component supply and long-term manufacturability.

Supply support for KSB1116AGBU 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 analog, discrete, and power management ICs, acquired by ON Semiconductor in 2016.

The KSB1116AGBU belongs to Fairchild's legacy audio and general-purpose bipolar transistor product line, engineered for reliability in consumer audio, industrial controls, and power interface circuits.

FAQ

What is the pin configuration of KSB1116AGBU?

KSB1116AGBU uses standard TO-92 pinout: Pin 1 = Emitter, Pin 2 = Collector, Pin 3 = Base. This configuration is confirmed in Fairchild's Rev. A2 mechanical drawing and matches industry-standard PNP transistor orientation for through-hole mounting. Always verify orientation via package marking (flat side facing viewer, leads down) before PCB layout.

Is KSB1116AGBU RoHS compliant?

KSB1116AGBU was manufactured prior to RoHS enforcement deadlines and predates formal RoHS certification. It contains leaded solder terminations and is not RoHS-compliant per EU Directive 2011/65/EU. For new designs requiring RoHS compliance, consult Aetrix Electronics for qualified drop-in alternatives with equivalent electrical specs and TO-92 packaging.

What does the 'G' suffix in KSB1116AGBU indicate?

The 'G' in KSB1116AGBU denotes Fairchild's h_FE binning grade: guaranteed DC current gain of 200–400 at V_CE = −2 V and I_C = −100 mA. This tighter specification enables predictable biasing in linear amplifier designs and reduces unit-to-unit variation in production assemblies using KSB1116AGBU.

Can KSB1116AGBU replace KSB1116A in existing designs?

Yes - KSB1116AGBU is a G-grade variant of KSB1116A with identical absolute maximum ratings, package, pinout, and electrical test conditions. The only difference is tighter h_FE binning (200–400 vs. 135–400 for standard KSB1116A), making KSB1116AGBU a direct upgrade for designs needing improved gain consistency without layout or schematic changes.

What is the maximum safe operating frequency for KSB1116AGBU in switching mode?

KSB1116AGBU achieves reliable switching up to ~500 kHz in hard-saturation mode, based on its t_ON + t_STG + t_F = 0.84 µs total switching time and f_T ≥ 70 MHz. For sustained operation, keep duty cycle ≤50% and pulse width ≤10 ms per Safe Operating Area curves. Avoid continuous operation above 100 kHz without thermal validation.