onsemi KST2907AMTF

Overview

KST2907AMTF from ON Semiconductor is a PNP epitaxial silicon transistor in SOT-23 package, rated for −60 V collector-emitter voltage, −600 mA continuous collector current, and 350 mW power dissipation. It delivers DC current gain (hFE) of 100 at IC = −10 mA and −10 V VCE, with saturation voltages of −0.4 V (VCE(sat)) and −1.3 V (VBE(sat)) under IC = −150 mA/IB = −15 mA conditions-commonly used in low-voltage switching and level-shifting circuits.

For engineers reviewing the KST2907AMTF datasheet, pinout, applications, or equivalent options, key selection criteria include its PNP polarity, SOT-23 footprint compatibility, −60 V breakdown rating, −600 mA current capability, and verified 200 MHz fT performance for general-purpose analog and digital switching.

Technical Context

The KST2907AMTF operates as a discrete bipolar junction transistor with fixed PNP polarity and epitaxial base construction, enabling stable gain and fast switching. Its thermal resistance (RθJA = 357 °C/W) and derating slope (2.8 mW/°C above 25°C) define safe operating limits on standard FR-4 PCBs.

Electrical behavior is characterized by three absolute maximum ratings: −60 V VCBO/VCBO, −5 V VEBO, and −150 °C TSTG. Performance is validated across multiple bias points-including hFE minima of 75 at −0.1 mA and 50 at −500 mA-supporting both small-signal amplification and medium-current switching.

Key Specifications

Pinout & Package

SOT-23 3-lead plastic package (JEDEC TO-236AB), surface-mount compatible with standard reflow profiles. Dimensions per Fairchild MA03D Rev 10: 2.92 mm × 1.30 mm × 1.20 mm max height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with KST2907AMTF, MMBT2907A offers identical performance in SOT-23 form with updated branding, while PN2907A trades surface-mount convenience and speed for through-hole serviceability and higher thermal resistance-making KST2907AMTF optimal for space-constrained, high-density, and high-speed switching designs.

Availability

KST2907AMTF is available at Aetrix Electronics and suitable for LED driver circuits, level-shifting interfaces, relay control modules, and power sequencing nodes requiring stable component supply and consistent parametric performance across production batches.

Supply support for KST2907AMTF 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 specializing in energy-efficient power and signal management solutions for automotive, industrial, cloud computing, and consumer markets.

The KST2907AMTF belongs to ON Semiconductor's general-purpose bipolar transistor product line, engineered for cost-sensitive, high-volume switching applications where reliability, consistency, and SMT compatibility are critical.

FAQ

What is the maximum collector-emitter voltage rating for the KST2907AMTF?

The KST2907AMTF has a maximum collector-emitter voltage (VCEO) rating of −60 V. This rating applies under open-base conditions at TA = 25°C and defines the upper limit of reverse bias the device can withstand before breakdown. Exceeding this voltage risks permanent damage, especially during inductive load switching where voltage spikes may occur. Always verify actual circuit stress margins using worst-case transient analysis for the KST2907AMTF.

Does the KST2907AMTF support high-frequency switching applications?

Yes, the KST2907AMTF supports high-frequency switching with a current gain bandwidth product (fT) of 200 MHz and measured turn-off time (tOFF) of 110 ns. These parameters confirm suitability for digital signal routing, PWM dimming, and clock buffering up to ~50 MHz fundamental frequencies. However, actual achievable frequency depends on PCB layout, load capacitance, and base drive strength-designers should validate timing margins using the KST2907AMTF in their specific circuit.

What is the pin configuration of the KST2907AMTF in SOT-23 package?

The KST2907AMTF uses standard SOT-23 pinout: Pin 1 is Base, Pin 2 is Emitter, and Pin 3 is Collector. This matches JEDEC TO-236AB orientation with emitter adjacent to the tab notch. The configuration enables direct replacement of other SOT-23 PNP transistors like MMBT2907A. Always confirm physical orientation via top-marking "2F" and package outline before PCB layout or assembly for the KST2907AMTF.

How does the KST2907AMTF compare to the PN2907A in terms of thermal performance?

The KST2907AMTF has a junction-to-ambient thermal resistance (RθJA) of 357 °C/W on a standard FR-4 board, significantly higher than the PN2907A's ~200 °C/W due to its TO-92 package's larger copper mass and better convection path. As a result, the KST2907AMTF reaches higher junction temperatures at the same power dissipation. For sustained 350 mW operation, the KST2907AMTF requires careful thermal design-confirm derating curves and ambient limits per the KST2907AMTF datasheet.

Can the KST2907AMTF be used as a direct replacement for the MMBT2907A?

Yes, the KST2907AMTF is electrically and physically identical to the MMBT2907A-same die, same SOT-23 package, same absolute maximum and electrical characteristics. The only differences are part numbering convention (legacy Fairchild "KST" vs ON Semiconductor "MMBT") and minor packaging documentation. No PCB or schematic changes are needed when substituting KST2907AMTF for MMBT2907A, and both perform identically in all applications specified for the KST2907AMTF.