onsemi KSA1013OBU

Overview

KSA1013OBU from Fairchild Semiconductor is a PNP epitaxial silicon transistor designed for high-voltage switching and amplification in vertical deflection and audio output stages of color TV systems. It features V_CEO = −160 V, I_C = −1 A, h_FE = 100–200 (O-class), P_D = 900 mW, and f_T = 15–50 MHz - enabling robust operation in high-slew-rate analog power stages.

For engineers reviewing the KSA1013OBU datasheet, pinout, applications, or equivalent options, key selection criteria include its TO-92L package, −160 V breakdown rating, O-class h_FE binning, saturation voltage under high-current drive, and thermal resistance of 139 °C/W in standard FR-4 layout.

Technical Context

The KSA1013OBU operates as a medium-power PNP bipolar junction transistor with emitter-common configuration. Its −160 V V_CEO and −1 A I_C rating support high-voltage flyback and deflection load switching, while its 15–50 MHz f_T enables stable gain at video frequencies.

Thermal performance is defined by R_θJA = 139 °C/W on a 76 mm × 114 mm FR-4 board with minimum land pattern. The device exhibits V_CE(sat) = −1.5 V at I_C = −500 mA / I_B = −50 mA and V_BE(on) = −0.45 to −0.75 V at I_C = −5 mA, supporting predictable base drive design in linear and saturated modes.

Key Specifications

Pinout & Package

Package: TO-92L - molded plastic case with 3.3 mm body width, 4.6 mm height, and 0.5 mm lead pitch; optimized for manual insertion and wave soldering in consumer TV chassis.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP high-voltage switching applications.

Compared with KSA992YTA and KSA1220OTA, the KSA1013OBU offers optimal balance of −160 V capability, TO-92L fit, and O-class gain consistency - making it the preferred choice for cost-sensitive, space-constrained CRT TV vertical output replacements where exact footprint retention is critical.

Availability

KSA1013OBU is available at Aetrix Electronics and suitable for color TV vertical deflection, CRT monitor scan output, and analog audio power amplification requiring stable component supply and long-term obsolescence management.

Supply support for KSA1013OBU 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 KSA1013OBU belongs to Fairchild's legacy high-voltage bipolar transistor family, engineered specifically for reliability-critical analog video subsystems in consumer CRT displays.

FAQ

What is the h_FE range for KSA1013OBU?

The KSA1013OBU is binned to the "O" classification, guaranteeing a DC current gain (h_FE) of 100–200 when measured at V_CE = −5 V and I_C = −200 mA. This tighter binning improves predictability in production TV bias networks compared to broader "R" or "Y" variants, and is explicitly confirmed in the Absolute Maximum Ratings table and h_FE Classification chart of the KSA1013 Rev. 1.1.1 datasheet.

Is KSA1013OBU pin-compatible with KSA1013YBU?

Yes, KSA1013OBU and KSA1013YBU share identical TO-92L packaging and pinout (Emitter–Collector–Base), differing only in h_FE binning (O-class vs. Y-class) and top-mark coding ("KSA1013OBU" vs. "A1013"). Both meet the same absolute maximum ratings and thermal specifications, allowing direct functional substitution where gain tolerance permits.

What is the maximum safe operating temperature for KSA1013OBU?

The KSA1013OBU has a maximum junction temperature (T_J) of 150°C and a storage temperature range of −55°C to +150°C. In practice, sustained operation above +125°C at the die requires derating per the 7.2 mW/°C thermal coefficient beyond 25°C ambient, and proper PCB copper area must be maintained to sustain 900 mW dissipation without exceeding T_J limits.

Can KSA1013OBU replace KSA992 in vertical deflection circuits?

KSA1013OBU can replace KSA992 in many vertical deflection applications due to its higher −160 V V_CEO (vs. −120 V) and matching TO-92L package, but designers must verify that base drive capability supports the higher h_FE and that flyback clamp circuitry remains effective at the increased voltage margin. The KSA1013OBU datasheet confirms this use case in its Features section.

Does KSA1013OBU require a heatsink in typical TV applications?

No, the KSA1013OBU does not require an external heatsink in standard CRT TV vertical deflection applications when mounted on a 76 mm × 114 mm FR-4 board with minimum land pattern, as its specified R_θJA of 139 °C/W allows full 900 mW dissipation with ≤70°C temperature rise above 25°C ambient - well within the 150°C T_J limit.