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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

onsemi KSH45H11TF

Name: KSH45H11TF
Brand: onsemi
SKU: KSH45H11TF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KSH45H11TF

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: KSH45H11TF.pdf

Description:: TRANS PNP 80V 8A DPAK

Quantity:: RFQ Add To RFQ list

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Product details

Overview

KSH45H11TF from ON Semiconductor is a PNP epitaxial silicon power transistor in TO-252 (DPAK) package, rated for −80 V V_CEO, −8 A I_C, and 20 W P_C at T_C = 25°C, with low −1 V V_CE(sat) at −8 A/−0.4 A drive-used as a high-current switching element in DC-DC converter output stages.

For engineers reviewing the KSH45H11TF datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, validated DPAK terminal mapping, switching timing data (t_ON/t_F), thermal derating curves, and direct alternatives for PNP power switching designs requiring robust SOA and fast turn-off.

Technical Context

The KSH45H11TF operates as a medium-power PNP bipolar junction transistor optimized for hard-switching applications. Its −80 V V_CEO rating and 40 MHz f_T support operation in offline and isolated DC-DC topologies up to several hundred kHz, while its 230 pF C_ob and 100 ns t_F enable efficient energy transfer during commutation.

Designed for surface-mount use in DPAK, it features electrically similar characteristics to the legacy KSE45H but with improved thermal resistance via copper leadframe. The device exhibits h_FE = 60 at −2 A and drops to 40 at −4 A, supporting stable current gain across typical load ranges in regulator feedback or driver circuits.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−80 V - Withstands 80 V reverse collector-emitter voltage before breakdown; enables use in 48 V bus and flyback primary-side switching.
I_C (DC)	−8 A - Sustains continuous 8 A collector current; suitable for ≥100 W power stage conduction without forced cooling.
V_CE(sat)	−1 V @ −8 A/−0.4 A - Low saturation voltage minimizes conduction loss (≤8 W at full load), improving efficiency in linear and switching modes.
f_T	40 MHz - Supports stable high-frequency amplification and switching up to ~1–2 MHz with adequate gain margin.
t_F	100 ns - Fast fall time reduces switching losses during turn-off transitions in PWM-controlled converters.
P_C (T_C = 25°C)	20 W - Maximum dissipation at case temperature of 25°C; requires heatsinking above ~75°C case temp per derating curve.
C_ob	230 pF @ −10 V - Collector-base capacitance impacts snubber design and EMI filtering in high-dV/dt applications.

Pinout & Package

Package: TO-252-3 (DPAK), surface-mount, single-ended power package with exposed drain pad (pin 2) for thermal enhancement.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control input; requires −0.4 A base drive for full saturation at −8 A collector current.
2	Collector	Main power input node; electrically connected to exposed tab for low-thermal-resistance heatsinking.
3	Emitter	Power return path; common reference for base drive and load connection in high-side PNP configurations.

Key Features

Feature	Design Value
Low V_CE(sat)	−1 V at −8 A ensures ≤8 W conduction loss, reducing thermal burden in compact power modules.
Fast switching (t_F = 100 ns)	Enables high-frequency operation (>200 kHz) with minimal overlap loss in synchronous rectifier or buck-boost topologies.
High SOA at 100 μs	Sustains −8 A at −40 V in pulse mode-supports rugged operation during transient overloads in motor drives.
DPAK surface-mount form factor	Enables automated assembly and superior thermal coupling to PCB copper compared to through-hole TO-220 equivalents.
Electrically similar to KSE45H	Facilitates drop-in replacement in legacy designs using KSE45H, preserving layout and drive circuitry.

Applications

Switching Regulators	DC-DC Converters
Use Scenario: High-efficiency 48 V input buck converter delivering 12 V/5 A to industrial control logic. IC Role / Device Role / Timing Role: Main PNP switch in emitter-follower configuration controlling high-side output stage. Use Value: −1 V V_CE(sat) and 100 ns t_F reduce total switching + conduction loss to <1.2 W, enabling natural convection cooling.	Use Scenario: Isolated flyback converter for PoE-powered access point with 57 V input and 12 V/3 A output. IC Role / Device Role / Timing Role: Primary-side PNP switch driving transformer base in self-oscillating topology. Use Value: −80 V V_CEO provides 20% margin over reflected 48 V clamp voltage, ensuring reliable operation under line surge.
Power Amplifiers	Motor Driver Stages
Use Scenario: Class AB audio amplifier output stage delivering 20 W into 8 Ω speaker load. IC Role / Device Role / Timing Role: Complementary PNP output transistor paired with NPN counterpart in push-pull configuration. Use Value: h_FE = 40–60 across −2 A to −4 A supports stable biasing and low crossover distortion at rated output.	Use Scenario: H-bridge half-bridge leg for 24 V brushed DC motor control in warehouse automation system. IC Role / Device Role / Timing Role: High-side PNP switch enabling bidirectional current flow with gate-driven base control. Use Value: 20 W P_C and 150 °C T_J allow sustained 5 A peak current pulses without thermal shutdown in intermittent duty cycles.

Switching Regulators

DC-DC Converters

Use Scenario: High-efficiency 48 V input buck converter delivering 12 V/5 A to industrial control logic.

IC Role / Device Role / Timing Role: Main PNP switch in emitter-follower configuration controlling high-side output stage.

Use Value: −1 V V_CE(sat) and 100 ns t_F reduce total switching + conduction loss to <1.2 W, enabling natural convection cooling.

Use Scenario: Isolated flyback converter for PoE-powered access point with 57 V input and 12 V/3 A output.

IC Role / Device Role / Timing Role: Primary-side PNP switch driving transformer base in self-oscillating topology.

Use Value: −80 V V_CEO provides 20% margin over reflected 48 V clamp voltage, ensuring reliable operation under line surge.

Power Amplifiers

Motor Driver Stages

Use Scenario: Class AB audio amplifier output stage delivering 20 W into 8 Ω speaker load.

IC Role / Device Role / Timing Role: Complementary PNP output transistor paired with NPN counterpart in push-pull configuration.

Use Value: h_FE = 40–60 across −2 A to −4 A supports stable biasing and low crossover distortion at rated output.

Use Scenario: H-bridge half-bridge leg for 24 V brushed DC motor control in warehouse automation system.

IC Role / Device Role / Timing Role: High-side PNP switch enabling bidirectional current flow with gate-driven base control.

Use Value: 20 W P_C and 150 °C T_J allow sustained 5 A peak current pulses without thermal shutdown in intermittent duty cycles.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD45H11T4	Same V_CEO (−80 V), lower I_C (−5 A), higher V_CE(sat) (−1.3 V), TO-252 package.	Lower current handling limits use to ≤60 W converters; less suitable for 8 A continuous loads.	Select when thermal budget allows higher saturation loss and peak current demand is ≤5 A.
BDX53C	TO-126 package, −100 V V_CEO, −8 A I_C, but slower t_F (500 ns), higher V_CE(sat) (−2 V).	Through-hole mounting; unsuitable for high-frequency designs due to poor switching speed and no DPAK thermal pad.	Choose only for legacy through-hole boards where rework to SMT is not feasible.

Compared with MJD45H11T4 and BDX53C, the KSH45H11TF delivers superior thermal performance via DPAK's exposed collector pad, faster switching (100 ns vs. 500 ns), and lowest V_CE(sat) among the three-making it optimal for space-constrained, high-efficiency 8 A switching applications.

Availability

KSH45H11TF is available at Aetrix Electronics and suitable for switching regulators, DC-DC converters, and power amplifiers requiring stable component supply, long-term manufacturability, and traceable sourcing from ON Semiconductor's qualified production line.

Supply support for KSH45H11TF 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 power management, analog, sensor, and discrete devices for automotive, industrial, and consumer markets.

The KSH45H11TF belongs to ON Semiconductor's legacy high-voltage PNP transistor product line, engineered for rugged, high-current switching in offline power supplies and motor control systems where reliability and SOA robustness are critical.

FAQ

What is the maximum continuous collector current for the KSH45H11TF?

The KSH45H11TF supports −8 A DC collector current at T_C = 25°C. Derating applies above 25°C case temperature per the published power derating curve-e.g., at T_C = 100°C, maximum I_C drops to approximately −4.5 A. This rating assumes proper PCB copper area and thermal vias under the DPAK tab to maintain safe junction temperature.

Does the KSH45H11TF have a built-in base-emitter resistor?

No, the KSH45H11TF is a standard three-terminal PNP bipolar transistor with no integrated base-emitter resistor. External base drive circuitry-including current-limiting resistors and optional Baker clamp-must be provided to achieve specified −0.4 A base current for full saturation at −8 A collector load.

Can the KSH45H11TF replace the KSE45H in existing designs?

Yes-the KSH45H11TF is explicitly stated as electrically similar to the KSE45H and shares identical TO-252 packaging, pinout, and key parameters including V_CEO, I_C, V_CE(sat), and h_FE. No PCB or schematic changes are required for direct substitution in legacy KSE45H-based power stages.

What is the safe operating area (SOA) limit for pulsed operation of the KSH45H11TF?

The KSH45H11TF SOA curve specifies −8 A at −40 V for 100 μs pulses, and −4 A at −80 V for 1 ms pulses. These limits ensure junction temperature remains within 150 °C under transient conditions. Exceeding SOA boundaries risks second breakdown and permanent device failure.

Is the KSH45H11TF RoHS compliant and halogen-free?

Yes-the KSH45H11TF is manufactured per ON Semiconductor's standard environmental compliance program: RoHS 2011/65/EU compliant and halogen-free per J-STD-709 definition (Cl + Br < 900 ppm). Full compliance documentation is available in the official ON Semiconductor product change notice PCN-19012.

KSH45H11TF Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 8 A

Voltage - Collector Emitter Breakdown (Max):: 80 V

Vce Saturation (Max) @ Ib, Ic:: 1V @ 400mA, 8A

Current - Collector Cutoff (Max):: 10µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 40 @ 4A, 1V

Power - Max:: 1.75 W

Frequency - Transition:: 40MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DPAK

KSH45H11TF FAQ

1.How can I place an order for KSH45H11TF through Aetrix?

Please submit a Request for Quotation (RFQ) for KSH45H11TF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for KSH45H11TF reliable?

The price and inventory of KSH45H11TF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSH45H11TF is usually 5 days.

3.What payment methods are accepted for KSH45H11TF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSH45H11TF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KSH45H11TF?

KSH45H11TF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KSH45H11TF order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for KSH45H11TF?

For technical support, including KSH45H11TF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSH45H11TF requirements.

6.How does Aetrix verify that KSH45H11TF is sourced from the original manufacturer or authorized distributors?

All KSH45H11TF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that KSH45H11TF meets industry standards.

7.What is the process for return or replacement of KSH45H11TF?

All KSH45H11TF units undergo pre-shipment inspection (PSI). If there is an issue with KSH45H11TF, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The KSH45H11TF part is unused and in its original packaging.

Return procedure for KSH45H11TF:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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