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onsemi KSC1009YTA
- Part No.:
- KSC1009YTA
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
KSC1009YTA.pdf
- Description:
- TRANS NPN 140V 0.7A TO-92-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,719
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Product details
Overview
KSC1009YTA 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 range of 120–240 (Y-class), and TO-92 package with side-collector pinout (Emitter–Base–Collector). It operates reliably in industrial power supplies and relay drivers where moderate gain and voltage handling are required.
For engineers reviewing the KSC1009YTA datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal characteristics, TO-92 terminal mapping, and validated alternative transistors for amplifier and switching circuit design.
Technical Context
The KSC1009YTA is a general-purpose NPN bipolar junction transistor optimized for linear amplification and medium-speed switching. Its 160 V collector-base breakdown voltage enables use in flyback snubbers and line-level signal stages, while its 30–50 MHz fT supports audio-frequency amplification up to ~20 kHz with stable gain.
With VCE(sat) ≤ 0.7 V at IC = 200 mA / IB = 20 mA and VBE(sat) ≤ 1.00 V under same conditions, the device delivers predictable saturation behavior in low-side switch configurations. Its Cob = 8 pF at VCB = 10 V minimizes high-frequency coupling in multi-stage amplifier designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO | 160 V - Supports operation in circuits with transient spikes up to 160 V across collector-base junction without breakdown. |
| VCEO | 140 V - Maximum safe DC voltage between collector and emitter with base open, suitable for 120 VAC-derived supply rails. |
| IC | 700 mA - Continuous collector current rating enabling drive of small relays, LEDs, or logic-level loads without external heat sinking. |
| PC | 800 mW - Power dissipation limit at 25°C ambient; requires derating above 25°C per RθJA = 150°C/W. |
| hFE (Y-class) | 120–240 - Guaranteed DC current gain range at VCE = 2 V, IC = 50 mA, ensuring consistent biasing in amplifier stages. |
| fT | 30–50 MHz - Current gain bandwidth product defining usable frequency limit for small-signal amplification before gain drops to unity. |
| Cob | 8 pF - Output capacitance at VCB = 10 V, influencing high-frequency roll-off and stability in multi-stage designs. |
Pinout & Package
Package: TO-92, 3-lead molded plastic case with straight or bent leads; marking "C1009 Y-" on top surface; side-collector configuration (Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Emitter | Current exit path; connected to ground or low-impedance return in common-emitter configurations. |
| 2 | Base | Control input; requires current-limited drive (e.g., via 1–10 kΩ resistor) to achieve target IC. |
| 3 | Collector | High-voltage output node; connects to load (e.g., relay coil, LED string) and supply rail in low-side switch topology. |
Key Features
| Feature | Design Value |
|---|---|
| High VCBO | 160 V enables robust operation in 100–120 VAC line-powered circuits with margin against surge events. |
| Y-class hFE binning | 120–240 gain range ensures predictable DC biasing without manual selection or trimming in production. |
| Low VCE(sat) | ≤0.7 V at 200 mA reduces conduction loss and self-heating in switching applications. |
| Complementary pairing | Designed as NPN counterpart to KSA709 PNP, supporting push-pull and differential amplifier topologies. |
| TO-92 compatibility | Standard through-hole footprint allows drop-in replacement in legacy designs using similar low-power transistors. |
Applications
| Audio Pre-amplifier Stage | DC Motor Speed Control |
|---|---|
Use Scenario: Amplifying low-level microphone or sensor signals before ADC sampling in embedded audio systems. IC Role / Device Role / Timing Role: NPN small-signal amplifier in common-emitter configuration with fixed bias network. Use Value: Stable 120–240 hFE ensures repeatable gain calibration; 30–50 MHz fT preserves fidelity up to 15 kHz. |
Use Scenario: PWM-driven low-side switch controlling 12 V brushed DC motors in robotics or appliance control boards. IC Role / Device Role / Timing Role: Medium-current switching transistor operating in saturation mode at 1–20 kHz PWM frequencies. Use Value: VCE(sat) ≤ 0.7 V limits power loss to <140 mW at 200 mA, reducing thermal stress without heatsink. |
| Relay Driver Circuit | Power Supply Feedback Transistor |
Use Scenario: Driving 5–12 V coil relays in industrial PLC I/O modules requiring isolation and transient immunity. IC Role / Device Role / Timing Role: Low-side switch interfacing microcontroller GPIO to relay coil with flyback diode protection. Use Value: 140 V VCEO withstands inductive kickback; 800 mW PC accommodates brief 500 mA surge during relay pull-in. |
Use Scenario: Error amplifier transistor in adjustable linear regulator feedback loop (e.g., LM317-based circuits). IC Role / Device Role / Timing Role: Precision current source/sink in op-amp-compensated voltage regulation stage. Use Value: Tight hFE binning (Y-class) improves loop stability and reference accuracy across temperature and unit variance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN general-purpose transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPSA42 | Higher VCBO (300 V), lower IC (500 mA), same TO-92 package; hFE 50–250 (unbinned). | Better suited for >200 V flyback snubbers but less capable in 700 mA continuous load switching. | Select when higher voltage margin is critical and current demand stays below 500 mA. |
| BC547C | Lower VCBO (50 V), higher hFE (420–800), same TO-92; PC = 500 mW. | Optimized for low-voltage, high-gain signal amplification-not rated for 140 V VCEO applications. | Choose only for sub-30 V circuits where gain consistency and noise performance outweigh voltage capability. |
Compared with MPSA42 and BC547C, the KSC1009YTA uniquely balances 140 V VCEO, 700 mA IC, and Y-class hFE in a single TO-92 device-making it optimal for industrial 12–24 V systems requiring both voltage headroom and current drive without redesigning layout or thermal management.
Availability
KSC1009YTA is available at Aetrix Electronics and suitable for industrial power supplies, relay driver modules, and audio pre-amplifier circuits requiring stable component supply, long-term manufacturability, and traceable sourcing.
Supply support for KSC1009YTA 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 management, analog, and discrete devices for automotive, industrial, and cloud infrastructure markets.
The KSC1009YTA belongs to ON Semiconductor's legacy general-purpose bipolar transistor portfolio, originally developed by Fairchild for cost-sensitive, high-reliability linear and switching applications in consumer and industrial electronics.
FAQ
What is the pin configuration of the KSC1009YTA?
The KSC1009YTA uses a side-collector TO-92 pinout: Pin 1 is Emitter, Pin 2 is Base, and Pin 3 is Collector. This configuration is confirmed in the official datasheet and distinguishes it from center-collector variants (e.g., KSC1009YTC). The KSC1009YTA marking "C1009 Y-" on the package body aligns with this pin assignment.
What does the "Y" suffix mean in KSC1009YTA?
The "Y" in KSC1009YTA denotes the hFE gain bin: 120–240 at VCE = 2 V and IC = 50 mA. This classification ensures tighter gain distribution than standard "R" (40–80) or "O" (70–140) bins, improving predictability in amplifier biasing and reducing need for post-manufacture sorting. The KSC1009YTA is therefore specified for applications requiring consistent DC current gain.
Can KSC1009YTA replace KSC1009YTC in a PCB design?
No-the KSC1009YTA (side-collector: E-B-C) and KSC1009YTC (center-collector: E-C-B) have opposite pinouts. Swapping them without board modification will reverse collector and base connections, causing circuit failure. The KSC1009YTA must be used only in layouts designed for its E-B-C sequence; verification against the physical marking and schematic is essential before substitution.
What is the maximum junction temperature for KSC1009YTA?
The KSC1009YTA has a maximum junction temperature (TJ) of 150°C, as specified in its Absolute Maximum Ratings table. Operation beyond this limit risks permanent degradation. Derating is required above 25°C ambient: power dissipation must decrease by 5.33 mW/°C (800 mW ÷ 150°C) to maintain TJ ≤ 150°C, based on RθJA = 150°C/W.
Is KSC1009YTA suitable for automotive applications?
No-KSC1009YTA is not qualified for automotive use. Per Fairchild/ON Semiconductor documentation, it is designated as a commercial-grade part with no AEC-Q101 qualification, and its Authorized Use policy explicitly excludes transportation and safety-critical systems. For automotive designs, engineers must select AEC-Q101–qualified alternatives; the KSC1009YTA remains appropriate only for industrial and consumer equipment.
KSC1009YTA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Packaging:
- Bulk
- 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
KSC1009YTA FAQ
1.How can I place an order for KSC1009YTA through Aetrix?
Please submit a Request for Quotation (RFQ) for KSC1009YTA 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 KSC1009YTA reliable?
The price and inventory of KSC1009YTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSC1009YTA is usually 5 days.
3.What payment methods are accepted for KSC1009YTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSC1009YTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSC1009YTA?
KSC1009YTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSC1009YTA 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 KSC1009YTA?
For technical support, including KSC1009YTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSC1009YTA requirements.
6.How does Aetrix verify that KSC1009YTA is sourced from the original manufacturer or authorized distributors?
All KSC1009YTA 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 KSC1009YTA meets industry standards.
7.What is the process for return or replacement of KSC1009YTA?
All KSC1009YTA units undergo pre-shipment inspection (PSI). If there is an issue with KSC1009YTA, 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 KSC1009YTA part is unused and in its original packaging.
Return procedure for KSC1009YTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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