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onsemi KSC1009GTA
- Part No.:
- KSC1009GTA
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
KSC1009GTA.pdf
- Description:
- TRANS NPN 140V 0.7A TO-92-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,863
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Product details
Overview
KSC1009GTA 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 = 200–400 (G-class), and TO-92 package. It operates reliably in audio preamplifier stages, relay drivers, and low-power DC-DC converter switch circuits.
For engineers reviewing the KSC1009GTA datasheet, pinout, applications, or equivalent options, key selection criteria include breakdown voltage margin (BVCEO = 140 V), saturation performance (VCE(sat) ≤ 0.7 V at IC = 200 mA), thermal resistance (RθJA = 150 °C/W), and hFE classification consistency across production lots.
Technical Context
The KSC1009GTA is a general-purpose NPN bipolar junction transistor optimized for linear amplification and medium-speed switching. Its epitaxial base structure supports stable hFE over temperature and current, with fT = 30–50 MHz enabling operation up to mid-VHF frequencies.
It exhibits low output capacitance (Cob = 8 pF at VCB = 10 V) and tight saturation voltage control (VBE(sat) = 0.86–1.00 V), making it suitable for efficient gain stages where power dissipation and signal fidelity are jointly constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO | 160 V - Enables safe operation in circuits with transient spikes up to 160 V across collector-base junction. |
| VCEO | 140 V - Supports DC supply rails up to 140 V in common-emitter amplifier or switch configurations. |
| IC | 700 mA - Sustains continuous collector current sufficient for driving small relays, LEDs, or logic-level interfaces. |
| PC | 800 mW - Allows dissipation of up to 0.8 W at 25°C ambient with standard FR-4 PCB mounting (RθJA = 150 °C/W). |
| hFE (G-class) | 200–400 - Provides predictable current gain for biasing stability in Class-A amplifiers and feedback-controlled switches. |
| fT | 30–50 MHz - Supports small-signal amplification in audio and low-frequency RF stages without significant gain roll-off. |
| Cob | 8 pF - Minimizes Miller effect in high-gain CE configurations, preserving bandwidth in multi-stage designs. |
Pinout & Package
Package: TO-92, 3-lead molded plastic case. Lead form: straight or bent; marking "C1009 G-" on top surface. Non-suffix version has side collector configuration (Pin 1: Emitter, Pin 2: Base, Pin 3: Collector).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Emitter | Current sink node; connects to ground or low-impedance return path in common-emitter topology. |
| 2 | Base | Control input; requires ~20 mA drive for full saturation at IC = 200 mA per datasheet test condition. |
| 3 | Collector | High-side output node; handles up to 140 V and 700 mA, routed to load or next stage collector supply. |
Key Features
| Feature | Design Value |
|---|---|
| High collector-base breakdown voltage | VCBO = 160 V enables robustness against inductive kickback in relay and solenoid driver circuits. |
| G-class hFE binning | hFE = 200–400 ensures consistent bias point setting across production units in amplifier designs. |
| Low VCE(sat) at rated current | VCE(sat) ≤ 0.7 V at IC = 200 mA / IB = 20 mA minimizes conduction loss in switching applications. |
| Complementary pairing | Designed as NPN complement to KSA709 PNP transistor for push-pull output stages and differential pairs. |
| TO-92 mechanical compatibility | Standard 0.2-inch lead spacing allows drop-in replacement in legacy through-hole PCB layouts. |
Applications
| Audio Preamp Stage | Relay Driver Circuit |
|---|---|
Use Scenario: Low-noise voltage amplification in microphone or line-level input stages before ADC or power amplification. IC Role / Device Role / Timing Role: NPN small-signal amplifier operating in Class-A with emitter degeneration for linearity. Use Value: hFE = 200–400 and fT ≥ 30 MHz support flat frequency response up to 20 kHz with <1% THD at 1 Vpp. |
Use Scenario: Driving 12 V/50 mA electromagnetic relay coil from microcontroller GPIO. IC Role / Device Role / Timing Role: Switching transistor in common-emitter configuration with base resistor bias network. Use Value: VCEO = 140 V absorbs back-EMF spikes; VCE(sat) ≤ 0.7 V limits power loss to <14 mW during hold state. |
| DC-DC Converter Switch | LED Current Regulator |
Use Scenario: Low-frequency (≤100 kHz) flyback or buck converter primary-side switch in isolated AC-DC adapters. IC Role / Device Role / Timing Role: Medium-current switching element controlled by PWM controller via optocoupler feedback loop. Use Value: IC = 700 mA and PC = 800 mW allow 500 mA continuous switching at 12 V input with adequate heatsinking. |
Use Scenario: Constant-current sink for high-brightness indicator LEDs in industrial HMI panels. IC Role / Device Role / Timing Role: Linear current regulator using emitter resistor feedback and base voltage reference. Use Value: Tight hFE binning (G-class) ensures ±5% current accuracy across units without trimming resistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN 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 ideal for high-current relay drivers due to lower IC rating. | Select MPSA42 when 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 logic interfacing and sensor amplification-not viable for 100+ V applications. | Choose BC547C only in sub-50 V systems requiring higher gain and lower saturation voltage. |
Compared with MPSA42 and BC547C, the KSC1009GTA uniquely balances 140 V VCEO, 700 mA IC, and G-class hFE in TO-92-making it optimal for cost-sensitive, medium-voltage industrial controls where both breakdown safety and current drive matter.
Availability
KSC1009GTA is available at Aetrix Electronics and suitable for audio preamplifiers, relay drivers, and low-frequency DC-DC converters requiring stable component supply, long-term manufacturability, and consistent parametric binning.
Supply support for KSC1009GTA 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 KSC1009GTA belongs to ON Semiconductor's legacy general-purpose bipolar transistor product line, originally developed by Fairchild for cost-effective, reliable discrete amplification and switching in commercial-grade equipment.
FAQ
What is the pin configuration of the KSC1009GTA?
The KSC1009GTA uses a TO-92 package with side-collector configuration: Pin 1 is Emitter, Pin 2 is Base, and Pin 3 is Collector. This layout matches standard through-hole PCB footprints for NPN transistors and is confirmed in the official Fairchild/ON Semiconductor datasheet Rev. 1.3. The KSC1009GTA does not use center-collector orientation (which would be denoted by suffix "-C").
What does the "G" suffix mean in KSC1009GTA?
The "G" in KSC1009GTA indicates hFE binning classification: devices marked with "G" have a DC current gain (hFE) range of 200–400 at VCE = 2 V and IC = 50 mA. This binning ensures predictable biasing in amplifier and switching circuits without requiring unit-by-unit gain measurement. The KSC1009GTA is therefore selected for designs demanding tighter hFE consistency than standard unbinned variants.
Can the KSC1009GTA replace the KSC1009YTA?
Yes-the KSC1009GTA and KSC1009YTA share identical electrical specifications, TO-92 package, and pinout; only the hFE binning differs (Y = 120–240, G = 200–400). The KSC1009GTA offers higher minimum hFE, improving reliability in marginal bias conditions. Both are manufactured by ON Semiconductor and fully interchangeable where gain headroom is beneficial.
What is the maximum junction temperature for the KSC1009GTA?
The KSC1009GTA has a maximum junction temperature (TJ) of 150°C, as specified in its Absolute Maximum Ratings table. Operation above this temperature risks permanent degradation of the epitaxial silicon structure. Derating is required above 25°C ambient-e.g., at 70°C ambient, maximum allowable power dissipation drops to approximately 427 mW based on RθJA = 150 °C/W. Thermal design must ensure the KSC1009GTA remains within this limit under worst-case load.
Is the KSC1009GTA suitable for automotive applications?
No-the KSC1009GTA is not qualified for automotive use. Per Fairchild/ON Semiconductor's Authorized Use policy, it is designated as a commercial-grade device and explicitly excluded from safety-critical, transportation, or life-support applications unless approved in writing. The KSC1009GTA lacks AEC-Q101 qualification, extended temperature screening, and failure-rate data required for automotive deployment.
KSC1009GTA 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:
- 200 @ 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
KSC1009GTA FAQ
1.How can I place an order for KSC1009GTA through Aetrix?
Please submit a Request for Quotation (RFQ) for KSC1009GTA 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 KSC1009GTA reliable?
The price and inventory of KSC1009GTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSC1009GTA is usually 5 days.
3.What payment methods are accepted for KSC1009GTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSC1009GTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSC1009GTA?
KSC1009GTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSC1009GTA 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 KSC1009GTA?
For technical support, including KSC1009GTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSC1009GTA requirements.
6.How does Aetrix verify that KSC1009GTA is sourced from the original manufacturer or authorized distributors?
All KSC1009GTA 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 KSC1009GTA meets industry standards.
7.What is the process for return or replacement of KSC1009GTA?
All KSC1009GTA units undergo pre-shipment inspection (PSI). If there is an issue with KSC1009GTA, 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 KSC1009GTA part is unused and in its original packaging.
Return procedure for KSC1009GTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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