onsemi KSA1013RBU

Overview

KSA1013RBU from onsemi 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 −160 V V_CEO, −1 A I_C, 900 mW power dissipation, h_FE of 60–120 (R-class), and f_T up to 50 MHz - enabling robust operation in high-slew-rate analog video circuits.

For engineers reviewing the KSA1013RBU datasheet, pinout, applications, or equivalent options, key selection criteria include verified PNP high-voltage capability, TO-92 package thermal derating (7.2 mW/°C), R-class h_FE binning, and safe operating area compliance at −160 V and −1 A pulse conditions.

Technical Context

This device operates as an emitter-common PNP switch/amplifier with fixed gain classification (R = 60–120) and is optimized for linear vertical deflection drive where low V_CE(sat) (≤ −1.5 V at −500 mA/−50 mA) and stable Cob (≤35 pF at −10 V) minimize switching loss and timing distortion.

Its junction temperature rating of 150°C and thermal resistance R_JA = 139°C/W (FR-4 PCB, 76 mm × 114 mm) support continuous-duty use in thermally constrained consumer chassis, while −6 V V_EBO ensures reliable base-emitter control under transient overvoltage.

Key Specifications

Pinout & Package

Package: TO-92 3 (Case 135AP), lead-formed, Pb-free, through-hole mounting. Dimensions: 8.0 mm × 4.9 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with KSA1013RBU, KSA1015YBU offers higher gain but identical voltage/current ratings, while MJD127G provides greater power handling at the cost of package and layout incompatibility - making KSA1013RBU optimal for space-constrained, gain-stable vertical output designs.

Availability

KSA1013RBU is available at Aetrix Electronics and suitable for color TV vertical deflection, analog monitor output stages, and legacy video equipment repair requiring stable component supply and long-term obsolescence management.

Supply support for KSA1013RBU 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensor, and logic solutions for automotive, industrial, cloud, and consumer markets.

The KSA1013RBU belongs to onsemi's legacy bipolar transistor product line, engineered specifically for high-reliability analog video signal path applications including CRT vertical and audio output stages.

FAQ

What is the maximum collector-emitter voltage rating for KSA1013RBU?

The KSA1013RBU has a guaranteed V_CEO rating of −160 V at T_A = 25°C. This rating is validated per onsemi's absolute maximum ratings table and applies under zero-base-current conditions with I_C = −10 mA. Operation beyond this voltage risks irreversible junction breakdown, especially during flyback transients in vertical deflection circuits.

How does the R-class h_FE bin affect circuit design for KSA1013RBU?

The R-class designation for KSA1013RBU specifies a DC current gain range of 60–120 at V_CE = −5 V and I_C = −200 mA. This tight bin ensures predictable base drive requirements across production units, allowing designers to size base resistors and driver stages without margining for wide h_FE variation - critical for stable bias in TV vertical output stages.

Is KSA1013RBU compatible with standard TO-92 footprints?

Yes, KSA1013RBU uses the TO-92 3 package (Case 135AP), with standardized 8.0 mm × 4.9 mm outline and lead-formed pin spacing. Pin 1 is Emitter, Pin 2 is Collector, Pin 3 is Base - matching JEDEC TO-92 mechanical specifications. No footprint adaptation is needed when replacing other TO-92 PNP transistors with identical pinout.

What is the thermal derating behavior of KSA1013RBU above 25°C ambient?

KSA1013RBU derates linearly at 7.2 mW/°C above T_A = 25°C, based on its R_JA of 139°C/W measured on a 76 mm × 114 mm FR-4 PCB with minimum land pattern. At 75°C ambient, its usable power dissipation drops to 540 mW - a key constraint for enclosed TV chassis where airflow is limited and junction temperature must stay below 150°C.

Can KSA1013RBU be used in audio amplifier output stages?

Yes, KSA1013RBU is explicitly featured for color TV audio output applications in its datasheet. Its −1 A I_C, low V_CE(sat) (≤ −1.5 V), and controlled Cob (≤35 pF) support Class-B or AB operation into 4–8 Ω loads. Designers should verify thermal design with actual duty cycle and heatsinking, as audio peaks can approach its 900 mW P_D limit.