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

onsemi KSE44H11TU

Name: KSE44H11TU
Brand: onsemi
SKU: KSE44H11TU
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KSE44H11TU

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: KSE44H11TU.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

KSE44H11TU from ON Semiconductor is an NPN 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 1 V V_CE(sat) at 8 A/0.4 A drive and supports fast switching with 300 ns t_ON, 500 ns t_STG, and 140 ns t_F - used in general-purpose power switching circuits including motor drivers and DC-DC converters.

For engineers reviewing the KSE44H11TU datasheet, pinout, applications, or equivalent options, key selection criteria include its 80 V breakdown rating, 10 A continuous current capability, TO-220 thermal performance, and complementary pairing with KSE45H series devices in push-pull configurations.

Technical Context

The KSE44H11TU operates as a high-current, medium-voltage NPN bipolar junction transistor optimized for linear and switching applications where low saturation voltage and controlled turn-off behavior are critical. Its 50 MHz f_T and 130 pF C_ob support operation up to several megahertz in hard-switched topologies.

Designed for discrete power stage implementation, it features a safe operating area (SOA) validated up to 100 V and 10 A with pulse conditions (PW ≤ 300 µs, duty ≤ 2%), and exhibits stable h_FE of 35–60 at V_CE = 1 V, I_C = 2 A - enabling predictable base drive design across temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	80 V - maximum allowable collector-emitter voltage before avalanche breakdown under open-base conditions
I_C (DC)	10 A - continuous collector current rating at T_C = 25°C, defining steady-state conduction capacity
V_CE(sat)	1 V max @ I_C = 8 A, I_B = 0.4 A - ensures low conduction loss and minimal self-heating during saturation
f_T	50 MHz - usable gain-bandwidth limit for small-signal amplification or high-speed switching control
C_ob	130 pF @ V_CB = 10 V, f = 1 MHz - directly impacts switching transition times and snubber design requirements
t_F	140 ns - fall time measured under V_CC = 20 V, I_C = 5 A, defining minimum off-state interval in PWM operation

Pinout & Package

Package: TO-220 (3-lead, straight lead, insulated tab). Case temperature derating begins above 25°C; full 50 W dissipation only achievable with heatsink and proper mounting.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Control input terminal	Receives forward bias current to enable conduction; requires ≥0.4 A drive for full saturation at 8 A load
2 (Collector)	High-side current path	Connected to positive rail or inductive load; electrically tied to metal tab in standard TO-220 variant
3 (Emitter)	Current return path	Common reference node for base drive and load return; must be low-inductance connection for fast switching

Key Features

Feature	Design Value
Low V_CE(sat)	1 V maximum at 8 A collector current enables <1.6 W conduction loss, reducing heatsink requirements
Fast switching speed	300 ns t_ON/500 ns t_STG/140 ns t_F supports PWM frequencies up to ~300 kHz with controlled EMI
Complementary pairing	Designed as NPN counterpart to KSE45H series PNP transistors for balanced push-pull output stages
Robust SOA	Validated safe operating area up to 100 V × 10 A (pulse) allows reliable operation under transient overload

Applications

Motor Drive Stage	DC-DC Converter Switch
Use Scenario: Driving brushed DC motors in industrial actuators requiring bidirectional control via H-bridge topology. IC Role / Device Role / Timing Role: NPN power switch in high-side or low-side position; handles 8–10 A peak current during acceleration/deceleration. Use Value: Low 1 V V_CE(sat) minimizes I²R losses during sustained conduction, improving thermal margin and efficiency at 24–48 V bus voltages.	Use Scenario: Primary-side switching element in non-isolated buck or boost converters for industrial power supplies. IC Role / Device Role / Timing Role: Hard-switched power transistor operating at 100–300 kHz with fixed or variable duty cycle. Use Value: 50 MHz f_T and 140 ns t_F ensure clean turn-off transitions, reducing switching loss and gate drive complexity.
Audio Amplifier Output	Relay/Solenoid Driver
Use Scenario: Class AB output stage in mid-power audio amplifiers (10–30 W) for public address or instrumentation systems. IC Role / Device Role / Timing Role: Linear-mode NPN emitter follower delivering low-impedance drive to 4–8 Ω speaker loads. Use Value: Stable h_FE of 35–60 across 2–8 A enables predictable biasing and low distortion at rated output power.	Use Scenario: High-current interface between microcontroller GPIO and 24 V/5 A industrial relays or solenoids. IC Role / Device Role / Timing Role: Single-ended switch controlling inductive load with flyback diode protection. Use Value: 80 V V_CEO provides 3× safety margin over 24 V nominal supply, preventing failure during inductive kickback events.

Motor Drive Stage

DC-DC Converter Switch

Use Scenario: Driving brushed DC motors in industrial actuators requiring bidirectional control via H-bridge topology.

IC Role / Device Role / Timing Role: NPN power switch in high-side or low-side position; handles 8–10 A peak current during acceleration/deceleration.

Use Value: Low 1 V V_CE(sat) minimizes I²R losses during sustained conduction, improving thermal margin and efficiency at 24–48 V bus voltages.

Use Scenario: Primary-side switching element in non-isolated buck or boost converters for industrial power supplies.

IC Role / Device Role / Timing Role: Hard-switched power transistor operating at 100–300 kHz with fixed or variable duty cycle.

Use Value: 50 MHz f_T and 140 ns t_F ensure clean turn-off transitions, reducing switching loss and gate drive complexity.

Audio Amplifier Output

Relay/Solenoid Driver

Use Scenario: Class AB output stage in mid-power audio amplifiers (10–30 W) for public address or instrumentation systems.

IC Role / Device Role / Timing Role: Linear-mode NPN emitter follower delivering low-impedance drive to 4–8 Ω speaker loads.

Use Value: Stable h_FE of 35–60 across 2–8 A enables predictable biasing and low distortion at rated output power.

Use Scenario: High-current interface between microcontroller GPIO and 24 V/5 A industrial relays or solenoids.

IC Role / Device Role / Timing Role: Single-ended switch controlling inductive load with flyback diode protection.

Use Value: 80 V V_CEO provides 3× safety margin over 24 V nominal supply, preventing failure during inductive kickback events.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD44H11T4	Different package (TO-252/DPAK); lower P_C (35 W @ T_C = 25°C); identical V_CEO/I_C/V_CE(sat) specs	Suitable for surface-mount PCBs with limited heatsinking; not interchangeable without layout change	Select when board space constraints prohibit through-hole TO-220 mounting
BD249C	Lower V_CEO (80 V → 60 V); same TO-220 package; h_FE min 40 vs. 35; slightly higher V_CE(sat) (1.2 V)	Limited to ≤60 V systems; acceptable where reduced voltage margin is acceptable and tighter h_FE tolerance is needed	Select when cost sensitivity outweighs need for 80 V rating and lowest possible saturation loss

Compared with MJD44H11T4 and BD249C, the KSE44H11TU offers superior thermal dissipation (50 W vs. 35 W or ~25 W), full 80 V rating for robustness in 48 V industrial systems, and the lowest V_CE(sat) among the three - making it optimal for thermally constrained, high-reliability linear or switching applications.

Availability

KSE44H11TU is available at Aetrix Electronics and suitable for motor drive stages, DC-DC converter switches, and relay/solenoid drivers requiring stable component supply and long-term industrial availability.

Supply support for KSE44H11TU 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, sensor, and logic solutions for automotive, industrial, and cloud power applications.

The KSE44H11TU belongs to the legacy Fairchild KSE44H series, designed specifically for general-purpose power switching in industrial controls, power supplies, and motor interfaces - emphasizing ruggedness, consistent gain, and thermal reliability in TO-220 form factor.

FAQ

What is the maximum collector-emitter voltage rating for the KSE44H11TU?

The KSE44H11TU has a maximum collector-emitter voltage (V_CEO) rating of 80 V at T_C = 25°C. This rating applies under open-base conditions and defines the upper limit for safe blocking operation. Exceeding this voltage risks avalanche breakdown and permanent device failure. Derating is required at elevated case temperatures per the datasheet's power derating curve.

Does the KSE44H11TU have a built-in base-emitter resistor?

No, the KSE44H11TU is a standard three-terminal NPN bipolar junction transistor with no integrated base-emitter resistor. It requires external base drive circuitry - typically a current-limiting resistor or active driver - to establish proper bias conditions. This distinguishes it from digital transistors or pre-biased devices, giving designers full control over switching thresholds and gain.

What is the typical DC current gain (h_FE) of the KSE44H11TU at 2 A collector current?

The KSE44H11TU exhibits a DC current gain (h_FE) ranging from 35 to 60 when measured at V_CE = 1 V and I_C = 2 A. This range reflects manufacturing variation across the production lot and is specified in the official ON Semiconductor datasheet. Designers should use the minimum value (35) for worst-case base drive calculations.

Can the KSE44H11TU be used in parallel with other transistors for higher current handling?

Parallel operation of KSE44H11TU devices is not recommended without individual emitter resistors and matched h_FE sorting. Due to inherent parameter spread - especially in h_FE and V_BE(sat) - unbalanced current sharing can occur, leading to thermal runaway in one device. For >10 A applications, consider a single higher-rated device or a dedicated power module instead of paralleling KSE44H11TU units.

Is the metal tab of the KSE44H11TU electrically connected to any internal terminal?

Yes, the metal tab of the KSE44H11TU in TO-220 package is internally connected to the collector terminal. This configuration requires electrical isolation (e.g., mica washer or insulating pad) when mounting to a heatsink shared with other circuit potentials. Failure to isolate may cause short circuits or ground loops, especially in high-side switching configurations.

KSE44H11TU Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: NPN

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:: 50MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220-3

KSE44H11TU FAQ

1.How can I place an order for KSE44H11TU through Aetrix?

Please submit a Request for Quotation (RFQ) for KSE44H11TU 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 KSE44H11TU reliable?

The price and inventory of KSE44H11TU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSE44H11TU is usually 5 days.

3.What payment methods are accepted for KSE44H11TU?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSE44H11TU transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KSE44H11TU?

KSE44H11TU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KSE44H11TU 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 KSE44H11TU?

For technical support, including KSE44H11TU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSE44H11TU requirements.

6.How does Aetrix verify that KSE44H11TU is sourced from the original manufacturer or authorized distributors?

All KSE44H11TU 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 KSE44H11TU meets industry standards.

7.What is the process for return or replacement of KSE44H11TU?

All KSE44H11TU units undergo pre-shipment inspection (PSI). If there is an issue with KSE44H11TU, 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 KSE44H11TU part is unused and in its original packaging.

Return procedure for KSE44H11TU:

1.Submit a request within 90 days.

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

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