onsemi KSH2955TM

Overview

KSH2955TM from ON Semiconductor is a PNP epitaxial silicon power transistor in D-PAK surface-mount package, rated for −60 V V_CEO, −10 A I_C, and 20 W P_C at T_C = 25°C. It delivers high DC current gain (h_FE = 20–100 at −4 A) and low saturation voltage (V_CE(sat) = −1.1 V at −4 A/−0.4 A), suited for general-purpose amplification and low-speed switching in industrial power supplies and motor control circuits.

For engineers reviewing the KSH2955TM datasheet, pinout, applications, or equivalent options, key selection criteria include its PNP polarity, −60 V blocking capability, −10 A continuous collector current rating, thermal performance in D-PAK, and compatibility with legacy KSE2955T-based designs requiring surface-mount upgrade paths.

Technical Context

The KSH2955TM operates as a medium-power, low-frequency PNP bipolar junction transistor optimized for linear amplification and hard-switching applications up to several hundred kHz. Its f_T of 2 MHz (min at V_CE = −10 V, I_C = −500 mA) confirms suitability for audio and DC-coupled control stages-not RF or high-speed digital switching.

Thermal design relies on case-mounted heatsinking: it dissipates 20 W at T_C = 25°C but derates linearly to zero at T_C = 150°C, with maximum junction temperature limited to 150°C. Safe operating area (SOA) curves confirm robustness under pulsed inductive loads with defined voltage/current/time boundaries.

Key Specifications

Pinout & Package

D-PAK (TO-252) surface-mount package with exposed drain pad thermally connected to collector; standardized 3-pin layout optimized for automated assembly and thermal management on FR-4 PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MJD2955T4G and STP16PF06, the KSH2955TM offers superior DC current gain consistency at full load and proven BJT linearity for analog bias circuits-making it preferred for applications demanding predictable h_FE-based design and thermal resilience under sustained conduction.

Availability

KSH2955TM is available at Aetrix Electronics and suitable for industrial DC motor control, linear audio amplifier stages, SMPS bias circuits, and overcurrent protection latches requiring stable component supply and long-term manufacturability.

Supply support for KSH2955TM 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 (formerly Fairchild Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, with leadership in power management, analog, sensors, and connectivity solutions.

The KSH2955TM belongs to ON Semiconductor's legacy power bipolar transistor family designed for rugged, cost-effective amplification and switching in industrial and consumer power systems where reliability and thermal performance are critical.

FAQ

What is the maximum junction temperature for the KSH2955TM?

The KSH2955TM has a maximum junction temperature (T_J) of 150°C, as specified in its Absolute Maximum Ratings table. This limit must be respected under all operating conditions-including transient surges-to ensure long-term reliability. Thermal design must maintain T_J ≤ 150°C using appropriate heatsinking, PCB copper area, and ambient airflow. The KSH2955TM datasheet provides derating curves showing how allowable power dissipation decreases as case temperature rises above 25°C.

Is the KSH2955TM pin-compatible with the KSE2955T?

The KSH2955TM is electrically similar to the KSE2955T and shares identical pinout (Base–Collector–Emitter), but differs in package: KSH2955TM uses D-PAK (TO-252), while KSE2955T uses TO-220. No PCB layout change is needed if migrating from KSE2955T to KSH2955TM only in new designs with D-PAK footprints. However, mechanical mounting and thermal interface must be redesigned due to different package form factor and thermal path.

What is the typical V_CE(sat) of the KSH2955TM at full rated current?

The typical V_CE(sat) of the KSH2955TM is −1.1 V at I_C = −4 A and I_B = −0.4 A. At the absolute maximum rated current of −10 A, V_CE(sat) rises to −1.8 V (max) under I_B = −3.3 A. These values define conduction losses in switching applications and directly impact thermal design-e.g., at −10 A, worst-case power dissipation in saturation exceeds 18 W, requiring robust heatsinking. The KSH2955TM datasheet specifies these points in its Electrical Characteristics table.

Does the KSH2955TM support surface-mount reflow assembly?

Yes, the KSH2955TM is packaged in D-PAK (TO-252), a standard surface-mount outline qualified for lead-free reflow soldering per JEDEC J-STD-020. Its thermal pad must be fully soldered to a large PCB copper area for thermal performance. Reflow profiles should follow ON Semiconductor's recommended thermal cycle for plastic packages, with peak temperature ≤ 260°C for ≤ 30 seconds. Hand-soldering is also supported due to its lead-formed terminals.

How does the KSH2955TM's f_T affect its use in audio applications?

The KSH2955TM's minimum f_T of 2 MHz ensures sufficient gain-bandwidth for full-range audio amplification (20 Hz–20 kHz) with ample phase margin in Class-AB output stages. Its f_T remains stable across the −500 mA test condition, supporting predictable frequency response in linear operation. However, it is not intended for RF or wideband signal amplification-the KSH2955TM datasheet confirms this limitation in its Typical Characteristics section, where gain rolls off beyond mid-audio frequencies.