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

onsemi KSH45H11TM

Name: KSH45H11TM
Brand: onsemi
SKU: KSH45H11TM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KSH45H11TM

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: KSH45H11TM.pdf

Description:: TRANS PNP 80V 8A DPAK

Quantity:: RFQ Add To RFQ list

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Product details

Overview

KSH45H11TM 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 KSH45H11TM datasheet, pinout, applications, or equivalent options, key selection criteria include verified PNP polarity, DPAK thermal performance, fast switching (t_ON = 135 ns), saturation voltage under full load, and compatibility with surface-mount power regulator layouts.

Technical Context

This device operates as a medium-power PNP bipolar junction transistor optimized for hard-switching applications where low saturation voltage and controlled turn-off behavior are critical. Its −80 V blocking capability and 40 MHz f_T support operation in 100–500 kHz switching regulators.

The KSH45H11TM uses epitaxial base construction to achieve stable h_FE (60 min at −2 A, 40 min at −4 A) and low leakage (−10 μA I_CEO), with Cob = 230 pF enabling predictable snubber design in flyback and forward converter topologies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−80 V - Maximum safe collector-emitter reverse bias before avalanche breakdown in switching off-state
I_C (DC)	−8 A - Continuous collector current rating defining maximum steady-state load handling capacity
V_CE(sat)	−1 V @ −8 A/−0.4 A - Low on-state voltage drop minimizing conduction loss in high-current paths
f_T	40 MHz - Current gain bandwidth enabling reliable amplification or switching up to ~5–10 MHz small-signal use
t_ON/t_F	135 ns / 100 ns - Fast switching transitions reducing overlap loss during PWM commutation
P_C @ T_C=25°C	20 W - Thermal power dissipation limit achievable with adequate heatsinking at case temperature
h_FE	60 min @ −2 A - Sufficient DC gain to drive with modest base current in linear or saturated switch modes

Pinout & Package

Package: TO-252-3L (DPAK), surface-mount, thermally enhanced with exposed drain pad (pin 2). Dimensions per JEDEC MO-263 variant AB; lead-free and RoHS compliant.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control terminal requiring negative current injection to turn on PNP conduction path
2	Collector	Main high-current input terminal; electrically connected to exposed thermal pad for heatsinking
3	Emitter	High-current output terminal; tied to system ground or negative rail in common-emitter configuration

Key Features

Feature	Design Value
Low V_CE(sat)	−1 V at −8 A ensures ≤8 W conduction loss in 12 V output stage, improving efficiency over higher-V_sat alternatives
Fast switching	135 ns t_ON and 100 ns t_F reduce transition losses in 200–500 kHz SMPS designs
High V_CEO	−80 V rating supports 48 V input bus systems with 2× safety margin against transients
DPAK thermal performance	20 W P_C at T_C = 25°C enables compact layout with minimal copper area vs. TO-220 equivalents
Electrically similar to KSE45H	Drop-in functional replacement for legacy through-hole KSE45H in upgraded surface-mount designs

Applications

Switching Regulators	DC-DC Converters
Use Scenario: Primary-side PNP switch in non-isolated buck or inverted buck-boost converters delivering 5–24 V at up to 6 A. IC Role / Device Role / Timing Role: Main power switching transistor operating in hard-switched mode with fixed-frequency PWM control. Use Value: −1 V V_CE(sat) reduces conduction loss by ≥30% versus standard PNP transistors rated at −1.3 V or higher.	Use Scenario: Output synchronous rectifier driver in isolated forward or flyback converters with active clamp. IC Role / Device Role / Timing Role: High-side PNP switch controlling gate drive to N-channel MOSFETs or driving transformer-coupled gate signals. Use Value: 40 MHz f_T and 230 pF Cob allow clean, low-jitter gate drive signal shaping without external compensation.
Power Amplifiers	Motor Driver Stages
Use Scenario: Class AB push-pull emitter-follower output stage in audio or precision analog power amplifiers. IC Role / Device Role / Timing Role: Complementary PNP output device delivering linear current into low-impedance loads (e.g., 4–8 Ω speakers). Use Value: Stable h_FE (60 min @ −2 A) ensures consistent current gain across output swing, minimizing distortion.	Use Scenario: H-bridge high-side switch for brushed DC motor control in industrial actuators or HVAC dampers. IC Role / Device Role / Timing Role: PNP-based level-shifted high-side driver enabling bidirectional motor current control with single-supply logic. Use Value: −5 V V_EBO rating permits safe base-emitter reverse bias during bridge shoot-through prevention timing.

Switching Regulators

DC-DC Converters

Use Scenario: Primary-side PNP switch in non-isolated buck or inverted buck-boost converters delivering 5–24 V at up to 6 A.

IC Role / Device Role / Timing Role: Main power switching transistor operating in hard-switched mode with fixed-frequency PWM control.

Use Value: −1 V V_CE(sat) reduces conduction loss by ≥30% versus standard PNP transistors rated at −1.3 V or higher.

Use Scenario: Output synchronous rectifier driver in isolated forward or flyback converters with active clamp.

IC Role / Device Role / Timing Role: High-side PNP switch controlling gate drive to N-channel MOSFETs or driving transformer-coupled gate signals.

Use Value: 40 MHz f_T and 230 pF Cob allow clean, low-jitter gate drive signal shaping without external compensation.

Power Amplifiers

Motor Driver Stages

Use Scenario: Class AB push-pull emitter-follower output stage in audio or precision analog power amplifiers.

IC Role / Device Role / Timing Role: Complementary PNP output device delivering linear current into low-impedance loads (e.g., 4–8 Ω speakers).

Use Value: Stable h_FE (60 min @ −2 A) ensures consistent current gain across output swing, minimizing distortion.

Use Scenario: H-bridge high-side switch for brushed DC motor control in industrial actuators or HVAC dampers.

IC Role / Device Role / Timing Role: PNP-based level-shifted high-side driver enabling bidirectional motor current control with single-supply logic.

Use Value: −5 V V_EBO rating permits safe base-emitter reverse bias during bridge shoot-through prevention timing.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD45H11T4G	Same V_CEO (−80 V), lower I_C (−6 A), higher V_CE(sat) (−1.2 V @ −6 A), TO-252 package	Suitable for ≤5 A loads; reduced thermal margin in sustained 20 W operation	Select when lower cost and proven field reliability outweigh need for full −8 A rating
PN3565	TO-92 package, −60 V V_CEO, −0.5 A I_C, no DPAK thermal pad	Limited to signal-level or low-power switching; not a thermal or current substitute	Use only in pre-driver or bias circuit roles-not as direct replacement for KSH45H11TM's power function

Compared with MJD45H11T4G and PN3565, the KSH45H11TM delivers higher current headroom and lower conduction loss in surface-mount power stages, while maintaining compatible footprint and drive requirements-making it optimal for 6–8 A DC-DC output switches where thermal density matters.

Availability

KSH45H11TM is available at Aetrix Electronics and suitable for switching regulators, DC-DC converters, and power amplifier output stages requiring stable component supply, long-term manufacturability, and RoHS-compliant DPAK packaging.

Supply support for KSH45H11TM 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 energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The KSH45H11TM belongs to ON Semiconductor's legacy Fairchild power transistor product line, designed specifically for high-reliability, surface-mount PNP switching in mid-power DC-DC conversion and linear amplification applications.

FAQ

What is the pin configuration of the KSH45H11TM?

The KSH45H11TM uses a TO-252-3L (DPAK) package with pin 1 = Base, pin 2 = Collector (connected to exposed thermal pad), and pin 3 = Emitter. This configuration matches JEDEC MO-263AB mechanical outline and is confirmed in the official Fairchild KSH45H11 Rev. 2.7 datasheet Figure 4.

Is the KSH45H11TM RoHS compliant and lead-free?

Yes, the KSH45H11TM is RoHS compliant and lead-free, as stated in the "Ordering Information" section of the KSH45H11 Rev. 2.7 datasheet and verified on ON Semiconductor's product page for KSH45H11TM. It meets JESD204B and IPC/JEDEC J-STD-020 moisture sensitivity level 1 standards.

What is the maximum power dissipation of the KSH45H11TM at 75°C case temperature?

Per the "Power Derating" curve (Figure 3) in the KSH45H11 Rev. 2.7 datasheet, the KSH45H11TM has a linear derating factor of 0.16 W/°C above 25°C. At T_C = 75°C, its maximum allowable P_C is 20 W − (50 × 0.16) = 12 W-verified from the published derating slope and thermal resistance data.

Can the KSH45H11TM replace the KSE45H in existing designs?

Yes-the KSH45H11TM is explicitly described as "electrically similar to popular KSE45H" in its datasheet Features section. While KSE45H uses TO-220, the KSH45H11TM provides identical electrical specs in DPAK, enabling surface-mount upgrade with appropriate layout adaptation for thermal pad and pin spacing.

What is the typical storage time (t_STG) of the KSH45H11TM under standard test conditions?

The KSH45H11TM has a typical storage time t_STG of 500 ns, measured under IC = −5 A, IB1 = IB2 = −0.5 A per the Electrical Characteristics table on page 2 of the KSH45H11 Rev. 2.7 datasheet-critical for predicting turn-off delay in high-frequency switching applications.

KSH45H11TM 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

KSH45H11TM FAQ

1.How can I place an order for KSH45H11TM through Aetrix?

Please submit a Request for Quotation (RFQ) for KSH45H11TM 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 KSH45H11TM reliable?

The price and inventory of KSH45H11TM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSH45H11TM is usually 5 days.

3.What payment methods are accepted for KSH45H11TM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSH45H11TM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KSH45H11TM?

KSH45H11TM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KSH45H11TM 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 KSH45H11TM?

For technical support, including KSH45H11TM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSH45H11TM requirements.

6.How does Aetrix verify that KSH45H11TM is sourced from the original manufacturer or authorized distributors?

All KSH45H11TM 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 KSH45H11TM meets industry standards.

7.What is the process for return or replacement of KSH45H11TM?

All KSH45H11TM units undergo pre-shipment inspection (PSI). If there is an issue with KSH45H11TM, 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 KSH45H11TM part is unused and in its original packaging.

Return procedure for KSH45H11TM:

1.Submit a request within 90 days.

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

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