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onsemi KSA1244OTU
- Part No.:
- KSA1244OTU
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-251-3 Short Leads, IPAK, TO-251AA
- Datasheet:
-
KSA1244OTU.pdf
- Description:
- TRANS PNP 50V 5A IPAK
- Quantity:
- Payment:
- Shipping:
Inventory:4,465
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Product details
Overview
KSA1244OTU from ON Semiconductor (formerly Fairchild) is a PNP epitaxial silicon transistor designed for high-current switching applications, with −50 V VCEO, −5 A IC, 20 W PC at TC=25°C, and 60 MHz fT, commonly used in power supply control and motor drive output stages.
For engineers reviewing the KSA1244OTU datasheet, pinout, applications, or equivalent options, key selection considerations include its low −0.5 V VCE(sat) at −3 A, −0.9 V to −1.2 V VBE(sat), hFE range of 70–240, safe operating area up to −30 V/−3 A, and I-Pak (TO-251AA) package thermal performance.
Technical Context
This PNP bipolar junction transistor operates in linear or saturated switching mode with specified DC current gain (hFE) of 70–140 (Class O) or 120–240 (Class Y), collector-emitter breakdown voltage of −50 V, and fast switching times: tON = 0.1 µs, tSTG = 1 µs, tF = 0.1 µs under −30 V VCC, −3 A IC, and 10 Ω RL.
Its thermal design supports 150°C maximum junction temperature and 20 W collector dissipation at case temperature 25°C, with derating above 25°C per Figure 6; output capacitance Cob is 170 pF at −10 V VCB, 1 MHz, enabling stable operation in medium-frequency switching circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −50 V - Maximum allowable collector-emitter voltage before breakdown in open-base condition |
| IC | −5 A - Continuous collector current rating defining maximum load-handling capability |
| PC (TC=25°C) | 20 W - Power dissipation limit with heatsink mounting, critical for thermal management |
| hFE (IC=−1 A) | 70–240 - DC current gain range determining base drive requirements for saturation |
| VCE(sat) | −0.5 V - Low saturation voltage at −3 A/−0.15 A, minimizing conduction loss in switching |
| fT | 60 MHz - Transition frequency indicating usable bandwidth for small-signal amplification |
| tON/tF | 0.1 µs each - Fast turn-on and fall times enabling efficient operation up to ~1 MHz switching |
Pinout & Package
Package: I-Pak (TO-251AA), surface-mount variant of TO-220 with isolated tab, 3-pin single-ended lead frame, 16.10 mm × 9.30 mm footprint, 2.30 mm height, and 6.60 mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Base) | Control input | Receives forward-biased current to enable conduction; requires −0.15 A for full saturation at −3 A IC |
| 2 (Collector) | High-side current sink | Connected to positive rail in PNP high-side switch configuration; carries full load current |
| 3 (Emitter) | Power reference node | Typically tied to system VCC; provides low-impedance return path and thermal interface via exposed tab |
Key Features
| Feature | Design Value |
|---|---|
| Low VCE(sat) | −0.5 V at −3 A ensures <0.15 W conduction loss, improving efficiency in high-current switches |
| High IC rating | −5 A continuous current supports robust load driving in industrial power stages |
| Fast switching | 0.1 µs tON/tF enables clean square-wave operation in PWM-controlled converters |
| Complementary pairing | Designed as PNP complement to NPN KSC3074, facilitating push-pull and H-bridge output stages |
Applications
| DC Motor Driver Stage | Linear Regulator Pass Element |
|---|---|
Use Scenario: Driving brushed DC motors in industrial actuators requiring bidirectional control and stall-current tolerance. IC Role / Device Role / Timing Role: PNP high-side switch in totem-pole or half-bridge configuration, handling peak currents up to −5 A. Use Value: −0.5 V VCE(sat) limits heat generation during 100% duty-cycle operation, reducing heatsink size. | Use Scenario: Series pass transistor in adjustable positive-output linear regulators delivering up to 3 A load current. IC Role / Device Role / Timing Role: Voltage-controlled current source regulating output by modulating base-emitter bias. Use Value: 60 MHz fT and stable hFE ensure adequate loop bandwidth for transient response without oscillation. |
| Switching Power Supply Output | Relay/Solenoid Driver |
Use Scenario: Main switching element in offline flyback or forward converter secondary-side synchronous rectification. IC Role / Device Role / Timing Role: Saturated PNP switch turning on/off transformer-coupled output winding current. Use Value: 1 µs storage time and 0.1 µs fall time minimize dead-time losses and improve conversion efficiency. | Use Scenario: High-current driver for 24 V industrial relays or hydraulic solenoids drawing 2–4 A inductive loads. IC Role / Device Role / Timing Role: Single-transistor interface between microcontroller GPIO and coil, with flyback diode integration. Use Value: −50 V VCEO withstands inductive kickback spikes up to −40 V, eliminating need for external clamping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP high-current switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJD122G | −60 V VCEO, −5 A IC, 1.5 W PC (TA), TO-252 package, lower thermal capacity than KSA1244OTU | Suitable for PCB-mounted low-power switching where heatsinking is limited | Select when board space is constrained and power dissipation remains below 1.5 W ambient |
| 2SB1217 | −60 V VCEO, −5 A IC, 20 W PC (TC), same I-Pak package, hFE 100–200, slightly higher VCE(sat) (−0.6 V) | Direct drop-in replacement in existing I-Pak footprints with minor gain/saturation trade-off | Prefer when sourcing continuity is required and −0.6 V VCE(sat) is acceptable |
Compared with MJD122G and 2SB1217, the KSA1244OTU offers superior thermal performance (20 W at TC) and lower saturation voltage (−0.5 V), making it optimal for high-duty-cycle, heatsink-mounted applications where efficiency and reliability are prioritized over footprint minimization.
Availability
KSA1244OTU is available at Aetrix Electronics and suitable for industrial motor drives, switching power supplies, and relay control systems requiring stable component supply, long-term lifecycle support, and traceable manufacturing origin.
Supply support for KSA1244OTU 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 supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud computing, and IoT applications.
The KSA1244OTU belongs to Fairchild's legacy high-current bipolar transistor product line, engineered specifically for ruggedized switching and linear regulation in harsh industrial environments.
FAQ
What is the maximum collector current rating for the KSA1244OTU?
The KSA1244OTU has a maximum continuous collector current (IC) rating of −5 A at TC = 25°C. This rating assumes proper heatsinking; derating is required above 25°C case temperature per the power derating curve in the datasheet. Pulse current capability exceeds −5 A under short-duration conditions defined by the Safe Operating Area (SOA) diagram.
Is the KSA1244OTU pin-compatible with the KSC3074?
No - the KSA1244OTU is a PNP transistor while the KSC3074 is an NPN device; they are complementary in function but not pin-compatible. Their pinouts differ: KSA1244OTU uses Base–Collector–Emitter (1–2–3), whereas KSC3074 follows Emitter–Collector–Base (1–2–3) in the same I-Pak package. Direct substitution without circuit redesign is not possible.
What package type does the KSA1244OTU use?
The KSA1244OTU uses the I-Pak (TO-251AA) surface-mount package: a 3-pin, single-ended lead frame with isolated metal tab for thermal and electrical isolation. Dimensions are 16.10 mm × 9.30 mm × 2.30 mm, with 6.60 mm lead pitch and 2.30 mm lead length, optimized for automated assembly and heatsink attachment.
Does the KSA1244OTU have a specified hFE range, and how is it classified?
Yes - the KSA1244OTU is offered in two hFE classifications: Class O (70–140) and Class Y (120–240), both measured at VCE = −1 V and IC = −1 A. The 'OTU' suffix indicates the Class Y variant. This binning allows precise base drive design for consistent saturation across production lots.
Can the KSA1244OTU be used in linear regulator applications?
Yes - the KSA1244OTU is suitable for linear regulator pass element applications due to its −50 V VCEO, −5 A IC, and stable hFE characteristics. Its 20 W collector dissipation at TC = 25°C supports high-dropout, high-current designs; however, thermal design must ensure junction temperature remains ≤150°C under worst-case load and ambient conditions.
KSA1244OTU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-251-3 Short Leads, IPAK, TO-251AA
- Packaging:
- Tube
- Product Status:
- Obsolete
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 5 A
- Voltage - Collector Emitter Breakdown (Max):
- 50 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 150mA, 3A
- Current - Collector Cutoff (Max):
- 1µA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 70 @ 1A, 1V
- Power - Max:
- 1 W
- Frequency - Transition:
- 60MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- IPAK
KSA1244OTU FAQ
1.How can I place an order for KSA1244OTU through Aetrix?
Please submit a Request for Quotation (RFQ) for KSA1244OTU 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 KSA1244OTU reliable?
The price and inventory of KSA1244OTU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSA1244OTU is usually 5 days.
3.What payment methods are accepted for KSA1244OTU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSA1244OTU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSA1244OTU?
KSA1244OTU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSA1244OTU 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 KSA1244OTU?
For technical support, including KSA1244OTU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSA1244OTU requirements.
6.How does Aetrix verify that KSA1244OTU is sourced from the original manufacturer or authorized distributors?
All KSA1244OTU 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 KSA1244OTU meets industry standards.
7.What is the process for return or replacement of KSA1244OTU?
All KSA1244OTU units undergo pre-shipment inspection (PSI). If there is an issue with KSA1244OTU, 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 KSA1244OTU part is unused and in its original packaging.
Return procedure for KSA1244OTU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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