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

onsemi KSE45H11

Name: KSE45H11
Brand: onsemi
SKU: KSE45H11
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KSE45H11

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: KSE45H11.pdf

Description:: TRANS PNP 80V 10A TO-220-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

KSE45H11 from ON Semiconductor is a PNP epitaxial silicon power transistor in TO-220 package, rated for -80 V V_CEO, -10 A DC collector current, and 50 W collector dissipation at T_C = 25°C. It delivers low saturation voltage (V_CE(sat) ≤ -1 V @ -8 A/-0.4 A), fast switching (t_ON = 135 ns, t_F = 100 ns), and is designed for general-purpose power switching in industrial motor drives and DC-DC converters.

For engineers reviewing the KSE45H11 datasheet, pinout, applications, or equivalent options, key selection criteria include its -80 V breakdown rating, -10 A continuous current capability, TO-220 thermal performance, complementary pairing with KSE44H, and suitability for linear and switching-mode power stages requiring robust PNP gain and saturation behavior.

Technical Context

The KSE45H11 operates as a high-current PNP bipolar junction transistor optimized for linear regulation and hard-switching applications. Its h_FE of 35–60 at V_CE = -1 V and I_C = -2 A ensures stable base drive control, while f_T = 40 MHz supports moderate-frequency switching up to several hundred kHz.

Thermal design relies on case-mounted heatsinking: 50 W dissipation is only valid at T_C = 25°C, derating to zero at T_C = 150°C per the linear derating curve. Safe operating area (SOA) data confirms ruggedness under inductive load conditions with pulse widths ≤300 µs and duty cycle ≤2%.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	-80 V - Maximum collector-emitter voltage before avalanche; defines upper rail limit in high-side PNP switch or series pass regulator.
I_C (DC)	-10 A - Continuous collector current; sets maximum steady-state load current without forced cooling.
P_C (T_C=25°C)	50 W - Peak power dissipation at case temperature 25°C; requires substantial heatsink for sustained operation.
V_CE(sat)	≤ -1 V @ I_C = -8 A, I_B = -0.4 A - Low saturation voltage minimizes conduction loss in switching and linear modes.
h_FE	35–60 @ V_CE = -1 V, I_C = -2 A - Sufficient DC gain for direct TTL/CMOS-compatible base drive without additional amplification.
f_T	40 MHz - Current-gain bandwidth product enabling reliable switching up to ~200 kHz with proper drive strength.
t_ON/t_F	135 ns / 100 ns - Fast turn-on and fall times reduce switching losses in PWM-controlled power stages.

Pinout & Package

Package: TO-220 (3-lead, straight lead, insulated tab). Mounting requires electrically isolated heatsink due to collector-connected tab.

Pin/Terminal	Circuit Role	Design Meaning
1 (Left)	Base	Control terminal; accepts negative base current to forward-bias emitter-base junction and enable conduction.
2 (Center)	Collector	Main current path input; internally connected to metal tab-must be electrically isolated from heatsink unless system ground reference permits.
3 (Right)	Emitter	Current return path; typically tied to higher potential rail in high-side switch configurations.

Key Features

Feature	Design Value
Low V_CE(sat)	≤ -1 V at -8 A enables <1.5 W conduction loss in 12 V/24 V industrial loads, reducing thermal burden.
Complementary Pairing	Designed as PNP counterpart to KSE44H NPN, supporting matched push-pull output stages in audio and power amplifiers.
Rugged SOA	Validated safe operating area up to 100 V × 10 A with pulse conditions (PW ≤300 µs, duty ≤2%), supporting inductive flyback handling.
High f_T	40 MHz bandwidth allows stable operation in Class AB linear amplifiers and medium-frequency SMPS gate drivers.

Applications

Industrial Motor Control	Linear Voltage Regulation
Use Scenario: Driving brushed DC motors in PLC I/O modules with bidirectional current control via H-bridge topology. IC Role / Device Role / Timing Role: High-side PNP switch providing controlled current sink to motor winding during reverse polarity phase. Use Value: -80 V rating accommodates 48 V bus transients; -10 A DC rating supports 50 W continuous motor drive without external current limiting.	Use Scenario: Series pass element in adjustable linear regulators powering analog sensor signal chains in factory automation. IC Role / Device Role / Timing Role: PNP series pass transistor regulating output by modulating emitter-collector current based on error amplifier feedback. Use Value: Low V_CE(sat) reduces dropout voltage to <1.2 V, enabling stable 5 V output from 6.2 V input under full 1 A load.
DC-DC Converter Output Stage	Audio Power Amplifier Output
Use Scenario: Synchronous rectifier or active clamp switch in isolated flyback or forward converter secondary side. IC Role / Device Role / Timing Role: PNP switch synchronizing with primary-side MOSFET to recover leakage energy and improve efficiency. Use Value: Fast t_F = 100 ns limits cross-conduction loss; Cob = 230 pF minimizes capacitive coupling noise into sensitive feedback networks.	Use Scenario: Complementary output pair with KSE44H in Class AB audio amplifier output stage for public address systems. IC Role / Device Role / Timing Role: PNP emitter-follower delivering high-current, low-distortion negative half-cycle output swing. Use Value: Matched h_FE range (35–60) and V_CE(sat) ensure symmetrical crossover behavior and <0.5% THD at 10 W into 4 Ω.

Industrial Motor Control

Linear Voltage Regulation

Use Scenario: Driving brushed DC motors in PLC I/O modules with bidirectional current control via H-bridge topology.

IC Role / Device Role / Timing Role: High-side PNP switch providing controlled current sink to motor winding during reverse polarity phase.

Use Value: -80 V rating accommodates 48 V bus transients; -10 A DC rating supports 50 W continuous motor drive without external current limiting.

Use Scenario: Series pass element in adjustable linear regulators powering analog sensor signal chains in factory automation.

IC Role / Device Role / Timing Role: PNP series pass transistor regulating output by modulating emitter-collector current based on error amplifier feedback.

Use Value: Low V_CE(sat) reduces dropout voltage to <1.2 V, enabling stable 5 V output from 6.2 V input under full 1 A load.

DC-DC Converter Output Stage

Audio Power Amplifier Output

Use Scenario: Synchronous rectifier or active clamp switch in isolated flyback or forward converter secondary side.

IC Role / Device Role / Timing Role: PNP switch synchronizing with primary-side MOSFET to recover leakage energy and improve efficiency.

Use Value: Fast t_F = 100 ns limits cross-conduction loss; Cob = 230 pF minimizes capacitive coupling noise into sensitive feedback networks.

Use Scenario: Complementary output pair with KSE44H in Class AB audio amplifier output stage for public address systems.

IC Role / Device Role / Timing Role: PNP emitter-follower delivering high-current, low-distortion negative half-cycle output swing.

Use Value: Matched h_FE range (35–60) and V_CE(sat) ensure symmetrical crossover behavior and <0.5% THD at 10 W into 4 Ω.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD45H11T4	Different package (TO-263/D²PAK); identical V_CEO, I_C, and V_CE(sat) specs; slightly lower f_T (30 MHz).	Suitable for surface-mount PCBs; requires reflow-compatible layout and lacks insulated tab-needs isolation pad if heatsink grounded.	Select when automated assembly and space-constrained layouts are prioritized over through-hole serviceability.
BDW93C	Lower V_CEO (-60 V); same I_C (-10 A); higher V_CE(sat) (-1.5 V typ); TO-220 package with collector-connected tab.	Limited to ≤48 V systems; higher conduction loss increases thermal demand at full load.	Acceptable for cost-sensitive 24 V motor controls where -60 V margin suffices and thermal headroom exists.

Compared with MJD45H11T4 and BDW93C, the KSE45H11 offers superior voltage margin (-80 V), lowest saturation voltage among TO-220 PNP transistors in its class, and proven compatibility with KSE44H in complementary designs-making it optimal for new 48–72 V industrial power stages requiring reliability and thermal headroom.

Availability

KSE45H11 is available at Aetrix Electronics and suitable for industrial motor control, linear voltage regulation, and DC-DC converter output stages requiring stable component supply and long-term manufacturing continuity.

Supply support for KSE45H11 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 manufacturer specializing in power management, analog, sensors, and logic devices for automotive, industrial, and cloud power applications.

The KSE45H11 belongs to ON Semiconductor's legacy Fairchild power transistor portfolio, engineered for rugged, high-current linear and switching applications in industrial automation and power conversion equipment.

FAQ

What is the maximum continuous collector current rating for the KSE45H11?

The KSE45H11 is rated for -10 A DC collector current at T_C = 25°C. This rating assumes adequate heatsinking; actual usable current decreases with rising case temperature per the published derating curve. Operation above -10 A requires pulsed conditions (PW ≤300 µs, duty ≤2%) and must stay within the SOA limits shown in the KSE45H11 datasheet.

Is the KSE45H11 pin-compatible with the KSE44H NPN transistor?

No-the KSE45H11 (PNP) and KSE44H (NPN) share the same TO-220 package outline and pin assignment (Base-Collector-Emitter), but their complementary polarity means they are not electrically interchangeable. They are designed to be used together in push-pull or complementary symmetry circuits, not as drop-in replacements for one another. The KSE45H11 pinout remains 1=Base, 2=Collector, 3=Emitter.

Does the KSE45H11 have an insulated tab, and how should it be mounted?

The KSE45H11 TO-220 package has a collector-connected metal tab. It is not electrically insulated; therefore, mounting to a grounded heatsink requires an insulating washer and shoulder washer kit (e.g., mica + silicone grease) to prevent shorting. Direct mounting without isolation risks collector-to-chassis shorts. Always verify insulation resistance >100 MΩ after installation.

What is the typical DC current gain (h_FE) of the KSE45H11 at operating conditions?

The KSE45H11 exhibits h_FE = 35–60 when measured at V_CE = -1 V and I_C = -2 A. This range reflects unit-to-unit variation across the production lot. For design purposes, use h_FE = 35 as the minimum guaranteed value to ensure sufficient base drive under worst-case conditions, especially in saturated switching applications.

Can the KSE45H11 be used in audio amplifier output stages?

Yes-the KSE45H11 is explicitly intended for complementary audio output stages alongside the KSE44H. Its low V_CE(sat), matched h_FE range, and 40 MHz f_T support clean Class AB operation with low crossover distortion. Application notes from Fairchild (now ON Semiconductor) confirm successful use in 10–20 W public address amplifiers with appropriate biasing and thermal management for the KSE45H11.

KSE45H11 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-220-3

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 10 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:: 60 @ 2A, 1V

Power - Max:: 1.67 W

Frequency - Transition:: 40MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220-3

KSE45H11 FAQ

1.How can I place an order for KSE45H11 through Aetrix?

Please submit a Request for Quotation (RFQ) for KSE45H11 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 KSE45H11 reliable?

The price and inventory of KSE45H11 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSE45H11 is usually 5 days.

3.What payment methods are accepted for KSE45H11?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSE45H11 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KSE45H11?

KSE45H11 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KSE45H11 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 KSE45H11?

For technical support, including KSE45H11 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSE45H11 requirements.

6.How does Aetrix verify that KSE45H11 is sourced from the original manufacturer or authorized distributors?

All KSE45H11 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 KSE45H11 meets industry standards.

7.What is the process for return or replacement of KSE45H11?

All KSE45H11 units undergo pre-shipment inspection (PSI). If there is an issue with KSE45H11, 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 KSE45H11 part is unused and in its original packaging.

Return procedure for KSE45H11:

1.Submit a request within 90 days.

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

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