onsemi KSB564AYBU

Overview

KSB564AYBU 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 = 120–240 (Y-class), and f_T = 110 MHz - used in complementary push-pull output stages of consumer audio amplifiers.

For engineers reviewing the KSB564AYBU datasheet, pinout, applications, or equivalent options, key selection considerations include its TO-92 package, −25 V V_CEO rating, −1 A continuous collector current capability, Y-class h_FE binning, and complementary pairing with KSD471A in Class AB amplifier designs.

Technical Context

This PNP bipolar junction transistor operates in linear amplification mode with DC current gain specified at V_CE = −1 V and I_C = −100 mA (h_FE = 120–240). Its safe operating area supports single-pulse operation up to −10 A at V_CE ≈ −1 V, and it exhibits low saturation voltages: V_CE(sat) = −0.5 V and V_BE(sat) = −1.2 V at I_C = −1 A / I_B = −0.1 A.

The device features a maximum junction temperature of 150°C, storage range of −55°C to +150°C, and output capacitance C_ob = 18 pF at V_CB = −6 V - enabling stable performance in mid-frequency audio driver applications where thermal management and switching speed are critical.

Key Specifications

Pinout & Package

Package: TO-92 (3-lead plastic through-hole), lead configuration: Emitter (1), Base (2), Collector (3); standardized for manual assembly and prototyping in low-power analog circuits.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MJD2955G and KSB772Y, the KSB564AYBU offers optimal balance of gain consistency, thermal profile, and through-hole manufacturability for sub-1 W audio and control applications - whereas MJD2955G trades gain for ruggedness and KSB772Y extends current capacity within the same package.

Availability

KSB564AYBU is available at Aetrix Electronics and suitable for audio power amplifiers, low-power DC motor controllers, linear voltage regulators, and LED constant-current drivers requiring stable component supply and long-term obsolescence mitigation.

Supply support for KSB564AYBU 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 KSB564AYBU belongs to Fairchild's legacy audio power transistor family, engineered specifically for cost-sensitive, thermally constrained linear amplifier and driver circuits requiring reliable PNP complementarity and tight h_FE binning.

FAQ

What is the pin configuration of the KSB564AYBU?

The KSB564AYBU uses a standard TO-92 package with pinout: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector. This configuration is explicitly defined in the original Fairchild datasheet Rev. A1 and verified across distributor footprint libraries. The KSB564AYBU must be mounted with correct orientation to ensure proper current flow in PNP biasing schemes.

Is the KSB564AYBU RoHS compliant?

Yes, the KSB564AYBU is RoHS compliant per ON Semiconductor's product change notification PCN-19001, which confirms lead-free termination and halogen-free molding compound for all TO-92 packaged transistors manufactured after 2010. The KSB564AYBU meets EU Directive 2011/65/EU and subsequent amendments without exemption.

What does the "Y" suffix in KSB564AYBU indicate?

"Y" denotes the h_FE gain bin: 120–240 at V_CE = −1 V and I_C = −100 mA. This classification ensures tighter DC current gain tolerance than the base KSB564A (O-bin: 70–140) or G-bin (200–400), making the KSB564AYBU preferred for applications requiring predictable base drive and matched pair performance with KSD471A.

Can the KSB564AYBU replace the KSB564A in existing designs?

Yes - the KSB564AYBU is a direct replacement for KSB564A with identical package, pinout, absolute ratings, and electrical characteristics, differing only in guaranteed h_FE range (Y-bin vs. O-bin). No layout or schematic changes are required; the KSB564AYBU improves consistency in production builds where gain variability impacts bias stability.

What is the maximum safe operating temperature for the KSB564AYBU?

The KSB564AYBU has a maximum junction temperature (T_J) of 150°C and storage temperature range of −55°C to +150°C. Derating is required above 25°C ambient: power dissipation decreases linearly to zero at 150°C case temperature. Thermal resistance R_θJA is approximately 156°C/W for TO-92 on FR-4 with 1 in² copper pad, so the KSB564AYBU must be thermally managed accordingly in sustained-load applications.