onsemi KSP63TA

Overview

KSP63TA from ON Semiconductor (formerly Fairchild) is a PNP epitaxial silicon Darlington transistor in TO-92 package, rated for −30 V V_CEO, −500 mA I_C, 625 mW P_C, and 125 MHz f_T, used in low-power switching and amplification circuits such as relay drivers and sensor interface stages.

For engineers reviewing the KSP63TA datasheet, pinout, applications, or equivalent options, key selection criteria include its Darlington gain structure (h_FE = 5,000–10,000 at I_C = −100 mA), −1.5 V V_CE(sat) at high current, −2.0 V V_BE(on), TO-92 mechanical compatibility, and −30 V breakdown rating.

Technical Context

The KSP63TA implements a two-stage PNP Darlington configuration with integrated base-emitter resistor network absent - requiring external base drive control. Its high DC current gain enables low-base-current switching of moderate loads while maintaining thermal stability up to 150°C junction temperature.

Designed for linear and saturated-mode operation, it features specified V_CE(sat) at I_C = −100 mA / I_B = −0.1 mA and V_BE(on) at I_C = −100 mA, with f_T measured at V_CE = −5 V, supporting bandwidth-critical analog and pulse applications up to 125 MHz.

Key Specifications

Pinout & Package

Package: TO-92, 3-lead through-hole plastic package with standard lead spacing (1.27 mm pitch), 3.86 mm max height, and JEDEC registered outline. Lead identification: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector (viewed from flat side with leads down).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPSA64 and BCV62, the KSP63TA uniquely balances Darlington-level gain (5K–10K), −30 V rating, and 625 mW dissipation in TO-92 - making it optimal for medium-current, low-drive industrial switching where both robustness and efficiency are required.

Availability

KSP63TA is available at Aetrix Electronics and suitable for relay drivers, sensor amplifiers, LED regulators, and industrial logic interfaces requiring stable component supply across extended production lifecycles.

Supply support for KSP63TA 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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The KSP63TA belongs to Fairchild's legacy discrete transistor portfolio, designed specifically for cost-sensitive, high-reliability PNP Darlington switching in industrial controls and instrumentation.

FAQ

What is the maximum collector-emitter voltage rating for the KSP63TA?

The KSP63TA has a maximum collector-emitter voltage (V_CEO) rating of −30 V at T_A = 25°C. This rating applies under open-base conditions and defines the upper limit for safe DC or pulsed operation. Exceeding −30 V risks avalanche breakdown; design margins should maintain ≤ −24 V in 24 V systems per industry practice. The KSP63TA datasheet confirms this value across all test conditions and revisions.

Does the KSP63TA have an integrated base resistor?

No, the KSP63TA does not include any built-in base resistors. It is a bare Darlington transistor requiring external base drive circuitry - typically a series resistor from controller output to pin 2 (Base). This distinguishes it from "digital transistor" variants like the NSV63T1G. The KSP63TA's external biasing allows flexible gain and speed tuning, confirmed in Fairchild's Rev. A2 datasheet section "Electrical Characteristics."

What is the typical DC current gain (h_FE) of the KSP63TA at 100 mA collector current?

The KSP63TA exhibits a typical DC current gain (h_FE) of 5,000 at V_CE = −5 V and I_C = −100 mA, with a minimum guaranteed value of 10,000 under the same conditions per the "Electrical Characteristics" table. This high gain enables microampere-level base currents to fully saturate the device - a core advantage of its Darlington structure, explicitly documented for KSP63/64 in the original Fairchild datasheet.

Can the KSP63TA be used in linear amplification applications?

Yes, the KSP63TA supports linear-mode operation, evidenced by its specified f_T = 125 MHz at V_CE = −5 V and I_C = −100 mA, and published small-signal characteristics including V_BE(on) and h_FE curves. Its gain stability and bandwidth make it suitable for audio preamps and sensor signal conditioning, provided thermal design accommodates 625 mW dissipation. The KSP63TA datasheet includes "Typical Characteristics" plots validating linear behavior.

What is the pin configuration of the KSP63TA in TO-92 package?

The KSP63TA uses standard TO-92 pinout: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector - verified by the "Package Dimensions" drawing and terminal identification diagram in the Fairchild KSP62/63/64 datasheet Rev. A2. When viewing the flat side of the package with leads pointing downward, the leftmost lead is Pin 1 (Emitter), center is Pin 2 (Base), rightmost is Pin 3 (Collector). This matches JEDEC TO-92 outline MO-002AA.