onsemi KSB564ACOBU

Overview

KSB564ACOBU from ON Semiconductor (formerly Fairchild) is a PNP epitaxial silicon transistor designed for audio frequency power amplification, with confirmed V_CEO = −25 V, I_C = −1.0 A, P_C = 800 mW, h_FE = 70–400, and f_T = 110 MHz. It serves as a complement to the NPN KSD471A in push-pull amplifier stages.

For engineers reviewing the KSB564ACOBU datasheet, pinout, applications, or equivalent options, key selection criteria include its center-collector TO-92 configuration, saturation voltage of −0.5 V at I_C = −1 A / I_B = −0.1 A, and guaranteed h_FE classification (O/Y/G bins).

Technical Context

This PNP bipolar junction transistor operates in linear and switching modes with a maximum junction temperature of 150°C and storage range of −55°C to +150°C. Its breakdown ratings-BVCBO = −30 V, BVCEO = −25 V, BVEBO = −5 V-define safe biasing limits in common-emitter and common-base configurations.

The device delivers DC current gain from 70 to 400 depending on h_FE bin (O/Y/G), exhibits Cob = 18 pF at V_CB = −6 V, and achieves f_T = 110 MHz under V_CE = −6 V / I_C = −10 mA, supporting mid-frequency audio and general-purpose switching.

Key Specifications

Pinout & Package

Package: TO-92, molded plastic case with center-collector lead configuration (Pin 1: Emitter, Pin 2: Base, Pin 3: Collector). Lead spacing and body dimensions conform to JEDEC TO-92 standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with KSB564ACOBU, MJD2955G offers vastly higher power capability but sacrifices audio-bandwidth performance and board-space efficiency, while KSB772 provides scalable current capacity within the same package-making it the preferred upgrade path for space-constrained, higher-current PNP needs.

Availability

KSB564ACOBU is available at Aetrix Electronics and suitable for audio amplifier modules, relay driver assemblies, and linear regulator circuits requiring stable component supply with consistent h_FE binning and TO-92 mechanical compatibility.

Supply support for KSB564ACOBU 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

ON Semiconductor (acquired Fairchild Semiconductor in 2016) is a global supplier of energy-efficient semiconductor components for automotive, industrial, cloud computing, and IoT applications.

The KSB564ACOBU belongs to Fairchild's legacy discrete bipolar transistor family, engineered specifically for cost-sensitive, medium-power analog signal conditioning and power switching in consumer and industrial electronics.

FAQ

What is the pin configuration of the KSB564ACOBU?

The KSB564ACOBU uses a TO-92 package with center-collector pinout: Pin 1 is Emitter, Pin 2 is Base, and Pin 3 is Collector. This configuration is explicitly defined in the Fairchild datasheet Rev. A1 and enables symmetrical layout when paired with the complementary NPN KSD471A. The "C" suffix in KSB564ACOBU confirms this center-collector arrangement.

What does the "COBU" suffix mean in KSB564ACOBU?

The "COBU" suffix in KSB564ACOBU indicates tape-and-reel packaging (BU), commercial temperature grade (C), and center-collector lead form (O). "COBU" is Fairchild's internal ordering code denoting the standard TO-92 variant with h_FE binning per specification, not a functional variant of the KSB564A die itself.

Is KSB564ACOBU RoHS compliant?

KSB564ACOBU was originally manufactured prior to RoHS enforcement and does not carry official RoHS certification. However, ON Semiconductor's current production equivalents (e.g., KSB564AYBU) meet RoHS Directive 2011/65/EU. For new designs, consult ON Semiconductor's latest datasheet and material declarations for KSB564A-series compliance status.

Can KSB564ACOBU replace KSB564A in existing designs?

Yes-KSB564ACOBU is functionally identical to KSB564A, differing only in packaging format (tape-and-reel) and possible h_FE bin assignment. Electrical specifications, pinout, thermal ratings, and absolute maximums are fully aligned per Fairchild Rev. A1 datasheet. No schematic or layout changes are needed for drop-in replacement.

What is the typical h_FE value for KSB564ACOBU at I_C = −100 mA?

Per the Fairchild KSB564A datasheet, h_FE is specified at V_CE = −1 V and I_C = −100 mA, with minimum 70, typical 200, and maximum 400 depending on bin (O/Y/G). The KSB564ACOBU inherits this specification; typical h_FE is 200, making it suitable for designs requiring predictable base drive current in linear amplifier or switching applications.