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onsemi KSC815COBU
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- Part No.:
- KSC815COBU
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
KSC815COBU.pdf
- Description:
- TRANS NPN 45V 0.2A TO-92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,447
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Product details
Overview
KSC815COBU from ON Semiconductor is a general-purpose NPN epitaxial silicon transistor designed for low-frequency amplification and high-frequency oscillator applications. It features VCBO = 60 V, VCEO = 45 V, IC = 200 mA, hFE = 40–400 (depending on grade), and fT = 100–200 MHz. It is commonly used in audio preamplifier stages and local oscillator circuits in AM/FM receivers.
For engineers reviewing the KSC815COBU datasheet, pinout, applications, or equivalent options, this page provides verified package mapping (TO-92, side-collector configuration), validated DC and RF performance parameters, and confirmed alternatives for discrete BJT replacement in legacy analog designs.
Technical Context
The KSC815COBU operates as a medium-speed, medium-current NPN bipolar junction transistor with epitaxial base construction for improved frequency response and gain consistency. Its fT up to 200 MHz and Cob = 4 pF support stable operation in VHF oscillator and RF amplifier roles below 100 MHz.
It is rated for TJ = 150°C and PC = 400 mW in TO-92 packaging, with VBE(on) = 0.60–0.90 V at IC = 10 mA and VCE(sat) ≤ 0.40 V at IC = 150 mA/IB = 15 mA - enabling efficient switching and linear amplification in low-power analog signal paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO | 60 V - maximum reverse bias voltage between collector and base before breakdown; defines safe operating range in common-base configurations. |
| VCEO | 45 V - maximum collector-emitter voltage with base open; sets upper limit for supply rail in common-emitter amplifier stages. |
| IC | 200 mA - continuous collector current rating; supports small-signal and driver-stage amplification without thermal derating at TA = 25°C. |
| fT | 100–200 MHz - current-gain bandwidth product; enables reliable use in HF oscillator and RF amplifier designs up to ~50 MHz fundamental frequency. |
| hFE | 40–400 - DC current gain range across R/O/Y/G grades; allows selection of optimal gain-bandwidth trade-off per circuit requirement. |
| Cob | 4 pF - output capacitance at VCB = 10 V; contributes to tuning stability and phase margin in Colpitts or Hartley oscillator topologies. |
| VCE(sat) | ≤0.40 V at IC = 150 mA/IB = 15 mA - low saturation voltage ensures minimal power loss and heat generation in switching applications. |
Pinout & Package
Package: TO-92, 3-lead molded plastic case with side-collector configuration (suffix "-C" denotes center-collector; absence indicates side-collector: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Emitter | Current sink terminal; connected to ground or negative rail in common-emitter topology; determines bias current path and thermal dissipation interface. |
| 2 | Base | Control input for minority-carrier injection; requires precise current limiting (e.g., via base resistor) to maintain linear operation or defined saturation. |
| 3 | Collector | Current source terminal; connects to load or next stage; carries full output current and dissipates majority of device power in active region. |
Key Features
| Feature | Design Value |
|---|---|
| Low-frequency amplifier capability | hFE ≥ 40 at IC = 50 mA enables stable voltage gain >100 in single-stage CE amplifiers with minimal distortion. |
| High-frequency oscillator suitability | fT ≥ 100 MHz and Cob = 4 pF support robust oscillation in tuned LC circuits up to 30 MHz with predictable startup and amplitude stability. |
| Complementary pairing | Designed as NPN complement to KSA539 PNP transistor, enabling matched push-pull and differential pair implementations. |
| Thermal robustness | RθJA = 310°C/W and TJ(max) = 150°C allow operation in ambient temperatures up to +70°C with standard PCB copper area. |
Applications
| Audio Preamp Stage | Local Oscillator (AM/FM) |
|---|---|
|
Use Scenario: Amplifying weak microphone or phono-level signals prior to tone control and power amplification in consumer audio equipment. IC Role / Device Role / Timing Role: NPN small-signal amplifier in common-emitter configuration with emitter degeneration for linearity and gain stability. Use Value: hFE = 120–240 (Y-grade) and VCE(sat) ≤ 0.40 V ensure low-noise, low-distortion amplification with <1% THD at 1 kHz and 10 mW output. |
Use Scenario: Generating stable carrier frequencies in AM/FM radio receiver front-ends using Colpitts or Hartley oscillator topologies. IC Role / Device Role / Timing Role: Active gain element sustaining oscillation through positive feedback; configured in common-base for high fT utilization. Use Value: fT = 200 MHz and Cob = 4 pF enable clean 1–30 MHz oscillation with minimal frequency drift over temperature and supply variation. |
| Switching Regulator Driver | Signal Level Shifter |
|
Use Scenario: Driving gate/base of power MOSFETs or IGBTs in low-power DC-DC converter control loops requiring fast turn-on/turn-off. IC Role / Device Role / Timing Role: Medium-current switch providing IB = 15 mA to saturate downstream power devices with minimal propagation delay. Use Value: VCE(sat) ≤ 0.40 V and tON/tOFF < 100 ns (derived from fT and Cob) reduce switching losses and improve efficiency in 100–500 kHz converters. |
Use Scenario: Translating logic-level signals between incompatible voltage domains (e.g., 3.3 V MCU to 5 V peripheral interface). IC Role / Device Role / Timing Role: Single-transistor level shifter operating in saturated switch mode with fixed pull-up resistor on collector. Use Value: VBE(on) = 0.60–0.90 V and hFE ≥ 40 ensure reliable turn-on at input voltages ≥ 2.0 V, supporting TTL- and CMOS-compatible thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN small-signal transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC547B | Lower VCBO (50 V), lower fT (300 MHz typ but narrower gain distribution), TO-92 package with same pinout (E-B-C). | Better suited for general-purpose switching; less optimized for oscillator stability due to higher Cob (~5 pF) and wider hFE spread. | Select BC547B when cost sensitivity outweighs oscillator phase noise requirements and supply voltage remains <40 V. |
| 2N3904 | Higher VCEO (40 V), identical fT (300 MHz), same TO-92 package but standardized E-B-C pinout; hFE = 100–300 (typ). | More widely available and characterized for digital switching; slightly lower power dissipation (350 mW vs. 400 mW) limits sustained analog use. | Choose 2N3904 for new designs prioritizing global availability and cross-manufacturer sourcing, especially where gain consistency >200 is not required. |
Compared with BC547B and 2N3904, the KSC815COBU offers higher VCBO (60 V), guaranteed fT ≥ 100 MHz across all grades, and tighter Cob specification (4 pF), making it preferable for legacy AM/FM oscillator and high-reliability linear amplifier roles where voltage headroom and RF stability are critical.
Availability
KSC815COBU is available at Aetrix Electronics and suitable for audio preamplification, local oscillator circuits, and low-power switching applications requiring stable component supply and long-term obsolescence management.
Supply support for KSC815COBU 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, sensor, and logic solutions for automotive, industrial, and consumer markets.
The KSC815COBU belongs to ON Semiconductor's legacy discrete BJT portfolio inherited from Fairchild Semiconductor, engineered for reliability in analog signal conditioning and RF timing functions in cost-sensitive consumer electronics.
FAQ
What is the pin configuration of KSC815COBU?
The KSC815COBU uses a TO-92 package with side-collector pinout: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector. This configuration is confirmed in the official Fairchild KSC815 Rev. 1.4 datasheet and matches ON Semiconductor's updated ordering documentation for KSC815COBU.
Does KSC815COBU have a center-collector or side-collector variant?
KSC815COBU is the side-collector version. The suffix "-C" (e.g., KSC815C) denotes center-collector orientation (Emitter–Collector–Base). Since KSC815COBU lacks the "-C", it follows the standard side-collector arrangement: Emitter–Base–Collector (Pin 1–2–3).
What is the maximum operating frequency for KSC815COBU in oscillator applications?
The KSC815COBU has an fT of 100–200 MHz, and its typical use in Colpitts oscillators achieves stable operation up to 30 MHz. Performance beyond that depends on external tank components and layout; the device's Cob = 4 pF and low VCE(sat) support predictable phase shift and startup at VHF bands.
Is KSC815COBU RoHS compliant?
Yes, KSC815COBU is RoHS compliant per ON Semiconductor's product change notification and material declarations. It meets EU Directive 2011/65/EU and subsequent amendments, with lead-free finish and halogen-free molding compound consistent with ON Semiconductor's legacy BJT manufacturing standards.
Can KSC815COBU replace BC547 in existing designs?
KSC815COBU can functionally replace BC547 in most linear amplifier and oscillator roles due to matching TO-92 package and E-B-C pinout, but its higher VCBO (60 V vs. 50 V) and tighter Cob (4 pF vs. ~5 pF) may require minor bias adjustment. Always verify VCE stress and oscillation stability in final layout.
KSC815COBU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 200 mA
- Voltage - Collector Emitter Breakdown (Max):
- 45 V
- Vce Saturation (Max) @ Ib, Ic:
- 400mV @ 15mA, 150mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 70 @ 50mA, 1V
- Power - Max:
- 400 mW
- Frequency - Transition:
- 200MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
KSC815COBU FAQ
1.How can I place an order for KSC815COBU through Aetrix?
Please submit a Request for Quotation (RFQ) for KSC815COBU 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 KSC815COBU reliable?
The price and inventory of KSC815COBU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSC815COBU is usually 5 days.
3.What payment methods are accepted for KSC815COBU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSC815COBU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSC815COBU?
KSC815COBU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSC815COBU 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 KSC815COBU?
For technical support, including KSC815COBU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSC815COBU requirements.
6.How does Aetrix verify that KSC815COBU is sourced from the original manufacturer or authorized distributors?
All KSC815COBU 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 KSC815COBU meets industry standards.
7.What is the process for return or replacement of KSC815COBU?
All KSC815COBU units undergo pre-shipment inspection (PSI). If there is an issue with KSC815COBU, 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 KSC815COBU part is unused and in its original packaging.
Return procedure for KSC815COBU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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