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onsemi KSC815CYTA
- Part No.:
- KSC815CYTA
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
KSC815CYTA.pdf
- Description:
- TRANS NPN 45V 0.2A TO-92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,288
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Product details
Overview
KSC815CYTA from ON Semiconductor is an NPN epitaxial silicon transistor designed for low-frequency amplification and high-frequency oscillator circuits, with VCBO = 60 V, VCEO = 45 V, IC = 200 mA, hFE = 120–240 (Y-class), and fT = 100–200 MHz - deployed in consumer audio preamplifiers and RF signal generators.
For engineers reviewing the KSC815CYTA datasheet, pinout, applications, or equivalent options, key selection criteria include its TO-92 package, center-collector configuration (Emitter–Collector–Base pinout), Y-grade DC current gain, low VCE(sat) of 0.15–0.40 V at IC = 150 mA, and 4 pF Cob at VCB = 10 V.
Technical Context
The KSC815CYTA operates as a general-purpose bipolar junction transistor with epitaxial base construction enabling stable high-frequency performance up to 200 MHz. Its design supports linear amplification under VCE = 1 V, IC = 50 mA bias and switching operation with validated saturation behavior at IC/IB = 10.
This device is explicitly specified with center-collector lead frame (suffix "-C": Pin 1 = Emitter, Pin 2 = Collector, Pin 3 = Base), distinguishing it from side-collector variants. Thermal resistance RθJA is 310°C/W on standard FR-4 PCB, limiting continuous power dissipation to 400 mW at TA = 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO | 60 V - maximum reverse voltage between collector and base before breakdown; sets safe operating margin for amplifier stage biasing |
| VCEO | 45 V - maximum collector-emitter voltage with base open; defines upper rail limit in common-emitter configurations |
| IC | 200 mA - absolute max continuous collector current; constrains output stage drive capability in discrete amplifier designs |
| hFE (Y-class) | 120–240 - guaranteed DC current gain range at VCE = 1 V, IC = 50 mA; enables predictable bias network design |
| fT | 100–200 MHz - current gain bandwidth product; confirms suitability for VHF oscillator and IF amplifier applications |
| Cob | 4 pF at VCB = 10 V - output capacitance affecting high-frequency stability and tuning range in LC tank circuits |
| VCE(sat) | 0.15–0.40 V at IC = 150 mA, IB = 15 mA - low saturation voltage reduces conduction loss in switching applications |
Pinout & Package
Package: TO-92 (3-lead, molded plastic, straight or bent leads, center-collector variant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Emitter | Current sink terminal; connects to ground or emitter resistor in common-emitter amplifier topology |
| 2 | Collector | Current source terminal; ties to supply rail through load resistor or transformer primary in oscillator circuits |
| 3 | Base | Control input; receives bias current or RF drive signal; requires current-limiting resistor in most discrete implementations |
Key Features
| Feature | Design Value |
|---|---|
| Center-collector TO-92 configuration | Pin 1 = Emitter, Pin 2 = Collector, Pin 3 = Base - ensures mechanical and electrical compatibility with legacy Y-class amplifier layouts |
| Y-class hFE binning (120–240) | Guaranteed gain range enables consistent small-signal amplification without post-manufacture sorting or trimming |
| Low VCE(sat) (0.15–0.40 V) | Minimizes voltage drop and heat generation during saturated switching, supporting efficient discrete driver stages |
| High fT (up to 200 MHz) | Validated oscillation capability in Colpitts and Hartley topologies up to 100 MHz fundamental frequency |
| Low Cob (4 pF) | Reduces Miller effect and improves high-frequency gain flatness in tuned RF amplifier stages |
Applications
| Audio Preamp Stage | RF Oscillator Core |
|---|---|
Use Scenario: Discrete two-stage line-level audio preamplifier in portable cassette players and analog mixers. IC Role / Device Role / Timing Role: NPN small-signal amplifier in common-emitter configuration with emitter degeneration. Use Value: Y-class hFE ensures stable gain across production lots; low VBE(on) (0.60–0.90 V) simplifies bias network design with single-supply rails. |
Use Scenario: Fundamental-mode Colpitts oscillator generating 30–80 MHz carrier signals in AM/FM transmitter modules. IC Role / Device Role / Timing Role: Active gain element sustaining resonance in LC tank circuit with fixed bias point. Use Value: 200 MHz fT and 4 pF Cob support reliable oscillation with minimal phase noise; TO-92 package allows compact layout near tank components. |
| DC Motor Driver Switch | Signal Generator Output Stage |
Use Scenario: Low-power brushed DC motor control in toys and instrumentation actuators (≤100 mA load). IC Role / Device Role / Timing Role: Single-transistor switch interfacing microcontroller GPIO to motor coil. Use Value: 0.15 V min VCE(sat) limits power loss to <15 mW at 100 mA; 400 mW PC rating accommodates brief surge currents. |
Use Scenario: Final buffer stage in benchtop function generators delivering 0–5 Vpp sine/square outputs into 50 Ω loads. IC Role / Device Role / Timing Role: Class-A emitter follower providing low-output-impedance drive with minimal distortion. Use Value: 150°C TJ rating supports continuous operation; 310°C/W RθJA enables thermal management on standard PCB without heatsink. |
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 |
|---|---|---|---|
| 2SC1815-Y | Same TO-92 package, identical pinout (E-C-B), but hFE = 120–240 at IC = 2 mA (not 50 mA); fT = 80 MHz typical | Lower fT and test condition mismatch reduce reliability in >50 MHz oscillator use | Select only when lower-frequency amplification (<30 MHz) or tighter hFE tolerance at low current is required |
| MPSA18 | TO-92, E-B-C pinout (side-collector), hFE = 100–300 at IC = 10 mA, fT = 150 MHz, VCEO = 45 V | Inverted pinout requires PCB redesign; higher hFE spread increases bias sensitivity in precision amplifiers | Acceptable where board layout permits rework and gain variation is tolerable; not drop-in compatible |
Compared with 2SC1815-Y and MPSA18, the KSC815CYTA offers verified Y-class hFE at 50 mA bias and superior fT consistency for RF-critical roles, while its center-collector TO-92 pinout preserves legacy audio amplifier footprint compatibility without layout revision.
Availability
KSC815CYTA is available at Aetrix Electronics and suitable for consumer audio preamplifiers, RF oscillator modules, and low-power DC motor drivers requiring stable component supply, consistent Y-bin hFE, and TO-92 mechanical fit.
Supply support for KSC815CYTA 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 consumer markets.
The KSC815CYTA belongs to ON Semiconductor's legacy general-purpose bipolar transistor portfolio, originally developed by Fairchild for cost-sensitive, high-reliability discrete amplifier and oscillator applications in mass-market electronics.
FAQ
What does the "Y" suffix in KSC815CYTA indicate?
The "Y" in KSC815CYTA denotes the hFE gain bin classification: guaranteed DC current gain of 120–240 at VCE = 1 V and IC = 50 mA. This binning ensures predictable amplifier gain and stable bias point selection across production lots of the KSC815CYTA, critical for repeatable audio and RF circuit performance.
Is KSC815CYTA pin-compatible with non-"C" variants like KSC815YTA?
No - KSC815CYTA uses center-collector TO-92 pinout (Emitter–Collector–Base), whereas KSC815YTA uses side-collector configuration (Emitter–Base–Collector). Swapping them without PCB modification will reverse collector and base connections, causing circuit failure. The KSC815CYTA pinout must be verified against the official ON Semiconductor datasheet before layout integration.
What is the maximum safe operating frequency for KSC815CYTA in oscillator applications?
The KSC815CYTA achieves fT up to 200 MHz, but practical oscillator stability is confirmed up to 80 MHz in Colpitts configurations per Fairchild application data. At 100 MHz, gain margin degrades due to Cob and package parasitics; sustained oscillation above 80 MHz requires careful layout, neutralization, and temperature derating - verified per actual KSC815CYTA measurement data.
Can KSC815CYTA replace KSA539 in complementary pair designs?
No - KSC815CYTA is an NPN transistor and KSA539 is its PNP complement, but they are not matched pairs. The KSC815CYTA datasheet explicitly states "Complement to KSA539" only in terms of voltage/current ratings (e.g., both rated for VCBO = 60 V, IC = 200 mA), not hFE tracking, VBE symmetry, or thermal coupling. Using KSC815CYTA with KSA539 requires independent bias optimization.
Does KSC815CYTA meet RoHS and REACH compliance?
Yes - KSC815CYTA is manufactured by ON Semiconductor and conforms to RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006, as documented in ON Semiconductor's official material declarations. Lead-free TO-92 packaging and halogen-free molding compound are standard for this part number, with full compliance traceability available via Aetrix Electronics' sourcing records.
KSC815CYTA 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):
- 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:
- 120 @ 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
KSC815CYTA FAQ
1.How can I place an order for KSC815CYTA through Aetrix?
Please submit a Request for Quotation (RFQ) for KSC815CYTA 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 KSC815CYTA reliable?
The price and inventory of KSC815CYTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSC815CYTA is usually 5 days.
3.What payment methods are accepted for KSC815CYTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSC815CYTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSC815CYTA?
KSC815CYTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSC815CYTA 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 KSC815CYTA?
For technical support, including KSC815CYTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSC815CYTA requirements.
6.How does Aetrix verify that KSC815CYTA is sourced from the original manufacturer or authorized distributors?
All KSC815CYTA 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 KSC815CYTA meets industry standards.
7.What is the process for return or replacement of KSC815CYTA?
All KSC815CYTA units undergo pre-shipment inspection (PSI). If there is an issue with KSC815CYTA, 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 KSC815CYTA part is unused and in its original packaging.
Return procedure for KSC815CYTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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