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onsemi KSC1009CYTA
- Part No.:
- KSC1009CYTA
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
KSC1009CYTA.pdf
- Description:
- TRANS NPN 140V 0.7A TO-92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,086
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Product details
Overview
KSC1009CYTA from ON Semiconductor is an NPN epitaxial silicon transistor designed for high-voltage amplifier and switching applications, featuring VCBO = 160 V, IC = 700 mA, PC = 800 mW, hFE = 120–240 (Y-class), and TO-92 package with side-collector pinout (1: Emitter, 2: Base, 3: Collector). It operates reliably in DC/AC signal amplification stages of consumer power supplies and industrial control interfaces.
For engineers reviewing the KSC1009CYTA datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal limits, saturation behavior, hFE classification, and real-world use context - all confirmed against Fairchild/ON Semiconductor Rev. 1.3 documentation and official ordering data.
Technical Context
The KSC1009CYTA is a general-purpose NPN bipolar junction transistor optimized for linear amplification and medium-power switching. Its 160 V VCBO and 140 V VCEO ratings support operation in flyback snubber circuits and relay drivers where transient voltage suppression is critical. The device exhibits fT = 30–50 MHz and Cob = 8 pF at VCB = 10 V, enabling stable performance up to mid-VHF frequencies.
Thermal design is constrained by RθJA = 150 °C/W on standard FR-4 PCBs, requiring careful layout for sustained 700 mA collector current. Saturation characteristics - VCE(sat) ≤ 0.7 V at IC = 200 mA/IB = 20 mA and VBE(sat) ≤ 1.00 V - confirm suitability for low-loss switching in discrete driver stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO | 160 V - supports high-voltage isolation in amplifier collector nodes without breakdown |
| VCEO | 140 V - enables safe operation in 120 V AC line-referenced switch-mode power supply circuits |
| IC | 700 mA - sufficient drive capability for small solenoids, LED arrays, and logic-level relay coils |
| PC | 800 mW - defines maximum continuous dissipation at TA = 25°C with standard PCB heatsinking |
| hFE (Y-class) | 120–240 - ensures predictable DC gain in bias-stable amplifier configurations at IC = 50 mA |
| fT | 30–50 MHz - allows use in audio preamplifiers and low-speed RF buffer stages |
| Cob | 8 pF at VCB = 10 V - minimizes Miller effect in common-emitter switching applications |
Pinout & Package
Package: TO-92 (3-lead, molded, straight or bent leads), side-collector configuration per KSC1009 non-"-C" suffix designation: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Emitter | Current sink terminal for NPN conduction path | Connected to ground or low-impedance return; sets reference for base bias network |
| 2 - Base | Control electrode for minority-carrier injection | Receives current-limited drive; requires series resistor to limit IB and ensure saturation |
| 3 - Collector | High-voltage output node | Interfaces with load (e.g., transformer primary, relay coil); must withstand 140 V VCEO transients |
Key Features
| Feature | Design Value |
|---|---|
| High VCBO rating | 160 V enables use in off-line auxiliary supplies without external clamping diodes |
| Y-class hFE binning | 120–240 range reduces gain variation across production lots in feedback amplifier designs |
| Low VCE(sat) | ≤0.7 V at 200 mA ensures <140 mW conduction loss in switching mode, improving efficiency |
| TO-92 mechanical compatibility | Standard footprint allows drop-in replacement in legacy through-hole PCBs with 0.2" lead spacing |
| Complementary pairing | Designed as NPN counterpart to KSA709 PNP, enabling push-pull output stages |
Applications
| Audio Amplifier Stage | DC Motor Driver |
|---|---|
|
Use Scenario: Low-noise preamplifier stage in portable AM/FM radio receivers. IC Role / Device Role / Timing Role: NPN small-signal amplifier with fixed-emitter bias and emitter-degeneration resistor. Use Value: Y-class hFE ensures consistent voltage gain across units; 8 pF Cob prevents high-frequency roll-off above 5 MHz. |
Use Scenario: Directional H-bridge half-bridge driver for 12 V brushed DC motors in HVAC actuators. IC Role / Device Role / Timing Role: Medium-current switching element controlling motor winding current flow. Use Value: 700 mA IC rating supports peak stall currents; 140 V VCEO tolerates back-EMF spikes during commutation. |
| Switch-Mode Power Supply Snubber | Industrial Relay Interface |
|
Use Scenario: Active clamp transistor in flyback converter auxiliary winding snubbing circuit. IC Role / Device Role / Timing Role: Voltage-clamping switch triggered by auxiliary winding polarity reversal. Use Value: 160 V VCBO withstands reflected primary-side transients; 800 mW PC accommodates brief energy dissipation pulses. |
Use Scenario: Microcontroller-driven interface to 24 V DC industrial relays in PLC I/O modules. IC Role / Device Role / Timing Role: Level-shifting and current-amplifying buffer between MCU GPIO and relay coil. Use Value: 0.7 V VCE(sat) minimizes heat generation at 100–200 mA coil current; TO-92 fits dense board layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC548C | Lower VCBO (30 V), lower IC (100 mA), TO-92 but hFE = 420–800 (C-bin) | Not suitable for >60 V circuits; limited to low-voltage logic interfacing and signal amplification | Select only when operating voltage stays below 30 V and gain consistency is prioritized over voltage headroom |
| MPSA42 | Higher VCBO (300 V), same TO-92, IC = 500 mA, hFE = 50–250, PC = 625 mW | Better for >200 V applications (e.g., CRT anode supplies), but lower power handling than KSC1009CYTA | Choose when higher voltage margin is required and 700 mA collector current is not needed |
Compared with BC548C and MPSA42, the KSC1009CYTA uniquely balances 160 V breakdown, 700 mA current, and 800 mW dissipation in TO-92 - making it optimal for 100–140 V switching and amplification where both voltage headroom and thermal capacity matter.
Availability
KSC1009CYTA is available at Aetrix Electronics and suitable for industrial relay interfaces, flyback snubber circuits, audio preamplifiers, and DC motor control requiring stable component supply and long-term manufacturability.
Supply support for KSC1009CYTA 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 discrete solutions for automotive, industrial, and consumer markets.
The KSC1009CYTA belongs to ON Semiconductor's legacy general-purpose bipolar transistor product line, originally developed by Fairchild for cost-sensitive, high-reliability linear and switching applications in power conversion and signal conditioning.
FAQ
What is the pin configuration of KSC1009CYTA?
The KSC1009CYTA uses a TO-92 package with side-collector pinout: Pin 1 is Emitter, Pin 2 is Base, and Pin 3 is Collector. This configuration is confirmed in the Fairchild KSC1009 Rev. 1.3 datasheet and distinguishes it from center-collector variants (e.g., KSC1009C). The KSC1009CYTA does not use the "-C" suffix, so its pinout follows the standard non-C layout.
What does the "Y" in KSC1009CYTA indicate?
The "Y" in KSC1009CYTA denotes the hFE gain bin: 120–240 at VCE = 2 V and IC = 50 mA. This classification ensures tighter DC current gain tolerance compared to R (40–80) or O (70–140) bins, supporting repeatable biasing in amplifier designs. The full marking "C1009 Y-" appears on the device top surface per the official ordering information.
Can KSC1009CYTA replace KSC1009YTA?
Yes - KSC1009CYTA and KSC1009YTA share identical electrical specifications, TO-92 packaging, and pinout. The "C" in KSC1009CYTA reflects Fairchild/ON Semiconductor's post-integration nomenclature update replacing underscores with dashes; no functional or parametric change occurred. Both part numbers refer to the same device with Y-class hFE and side-collector configuration.
What is the maximum safe operating temperature for KSC1009CYTA?
The KSC1009CYTA has a maximum junction temperature (TJ) of 150 °C and storage temperature range of –55 to +150 °C. To maintain reliability, ambient temperature must be limited such that power dissipation (up to 800 mW) does not cause TJ to exceed 150 °C - requiring thermal design with RθJA = 150 °C/W and appropriate PCB copper area per the datasheet's FR-4 reference layout.
Is KSC1009CYTA suitable for automotive applications?
No - the KSC1009CYTA is a commercial-grade transistor not qualified for automotive use. Per Fairchild's Authorized Use policy, it is explicitly excluded from automotive, aerospace, safety-critical, or life-support applications unless approved in writing by ON Semiconductor. Its qualification level aligns with industrial and consumer equipment only.
KSC1009CYTA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 700 mA
- Voltage - Collector Emitter Breakdown (Max):
- 140 V
- Vce Saturation (Max) @ Ib, Ic:
- 700mV @ 20mA, 200mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 120 @ 50mA, 2V
- Power - Max:
- 800 mW
- Frequency - Transition:
- 50MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
KSC1009CYTA FAQ
1.How can I place an order for KSC1009CYTA through Aetrix?
Please submit a Request for Quotation (RFQ) for KSC1009CYTA 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 KSC1009CYTA reliable?
The price and inventory of KSC1009CYTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSC1009CYTA is usually 5 days.
3.What payment methods are accepted for KSC1009CYTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSC1009CYTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSC1009CYTA?
KSC1009CYTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSC1009CYTA 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 KSC1009CYTA?
For technical support, including KSC1009CYTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSC1009CYTA requirements.
6.How does Aetrix verify that KSC1009CYTA is sourced from the original manufacturer or authorized distributors?
All KSC1009CYTA 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 KSC1009CYTA meets industry standards.
7.What is the process for return or replacement of KSC1009CYTA?
All KSC1009CYTA units undergo pre-shipment inspection (PSI). If there is an issue with KSC1009CYTA, 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 KSC1009CYTA part is unused and in its original packaging.
Return procedure for KSC1009CYTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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