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onsemi KSC815YTA
- Part No.:
- KSC815YTA
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
KSC815YTA.pdf
- Description:
- TRANS NPN 45V 0.2A TO-92-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,079
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Product details
Overview
KSC815YTA 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 KSC815YTA datasheet, pinout, applications, or equivalent options, this page delivers verified package mapping (TO-92, side-collector configuration), saturation voltage behavior (VCE(sat) ≤ 0.40 V at IC = 150 mA), thermal resistance (RθJA = 310 °C/W), and complementary pairing with KSA539.
Technical Context
The KSC815YTA operates as a general-purpose bipolar junction transistor with epitaxial base construction enabling stable gain and high-frequency response. Its DC current gain (hFE) is classified Y (120–240) at VCE = 1 V and IC = 50 mA, and it supports switching and linear amplification modes under TA = 25°C conditions.
It features low output capacitance (Cob = 4 pF at VCB = 10 V, f = 1 MHz) and fast switching capability confirmed by fT up to 200 MHz. The device uses a side-collector TO-92 pinout (Emitter–Base–Collector), distinguishing it from center-collector variants like KSC815YTC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO | 60 V - maximum reverse bias between collector and base before breakdown; sets safe operating voltage margin in amplifier bias networks |
| VCEO | 45 V - maximum collector-emitter voltage with base open; defines usable supply rail headroom in common-emitter stages |
| IC | 200 mA - continuous collector current rating; determines load-driving capacity in small-signal switching applications |
| hFE (Y-class) | 120–240 - guaranteed DC current gain range at VCE = 1 V, IC = 50 mA; enables predictable bias point stability in discrete amplifier designs |
| fT | 100–200 MHz - current gain bandwidth product; confirms suitability for VHF oscillator and RF amplifier use up to ~100 MHz fundamental |
| VCE(sat) | ≤ 0.40 V at IC = 150 mA, IB = 15 mA - low saturation voltage reduces conduction loss in switching applications |
| RθJA | 310 °C/W - junction-to-ambient thermal resistance on standard FR-4 PCB; informs heatsinking requirements for sustained 400 mW dissipation |
Pinout & Package
Package: TO-92 3L, side-collector configuration (1. Emitter, 2. Base, 3. Collector), straight or bent lead options, ammo packing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Emitter | Current sink terminal in active mode | Connected to ground or emitter resistor; polarity defines NPN operation and bias direction |
| 2 - Base | Control input for minority-carrier injection | Receives forward-biased drive current (IB); small-signal gain and switching speed depend on base resistance and drive strength |
| 3 - Collector | Current source terminal in active mode | Supplies amplified output current; connected to VCC via load resistor or transformer in RF/oscillator topologies |
Key Features
| Feature | Design Value |
|---|---|
| Low-frequency amplifier + HF oscillator dual role | Validated by fT ≥ 100 MHz and Cob = 4 pF - enables use in both audio preamp stages and 30–100 MHz LC oscillators without redesign |
| Y-class hFE binning (120–240) | Reduces gain variation across production lots - simplifies bias network design and improves consistency in volume-manufactured consumer electronics |
| Side-collector TO-92 pinout | Standardized pin assignment (E-B-C) ensures compatibility with legacy PCB footprints used for Fairchild KSC815 series replacements |
| Complementary pairing with KSA539 | Enables push-pull or differential amplifier configurations with matched voltage ratings (KSA539: PNP, VCEO = −45 V, VCBO = −60 V) |
Applications
| AM/FM Radio Front-End Amplifier | Portable Audio Preamp Stage |
|---|---|
|
Use Scenario: Signal amplification of weak antenna-coupled RF signals prior to mixer stage in compact AM/FM receivers. IC Role / Device Role / Timing Role: NPN small-signal amplifier operating in common-emitter configuration with tuned LC input network. Use Value: fT ≥ 100 MHz and low Cob (4 pF) preserve signal integrity and selectivity; Y-class hFE ensures repeatable gain calibration across units. |
Use Scenario: First-stage voltage amplification in battery-powered headphone amplifiers and portable CD players. IC Role / Device Role / Timing Role: Linear Class-A amplifier biased at IC ≈ 5–10 mA, delivering low-noise gain before tone control circuitry. Use Value: VCE(sat) ≤ 0.40 V minimizes dropout in single-supply 3–6 V systems; hFE = 120–240 enables stable bias with minimal emitter degeneration. |
| Crystal Oscillator Buffer | LED Flasher Driver |
|
Use Scenario: Isolation and gain staging of 1–10 MHz crystal oscillator outputs driving multiple downstream logic loads. IC Role / Device Role / Timing Role: Emitter-follower buffer providing low-impedance drive while preserving waveform fidelity and phase stability. Use Value: Low VBE(sat) (0.83–1.10 V) and high fT ensure faithful reproduction of fast edges; TO-92 footprint allows dense layout near crystal. |
Use Scenario: Discrete transistor switch controlling LED current in low-cost indicator circuits (e.g., power-on status, fault signaling). IC Role / Device Role / Timing Role: Saturated switch toggled by microcontroller GPIO or RC timing network. Use Value: IC = 200 mA rating supports multi-LED strings; VCE(sat) ≤ 0.40 V limits power loss and self-heating in continuous blink modes. |
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 |
|---|---|---|---|
| BC547C | Lower fT (300 MHz typ, but not guaranteed min), same TO-92 package, hFE = 420–800 (C-bin), VCEO = 45 V | Higher gain spread increases bias sensitivity; lacks Y-class tight hFE binning for production consistency | Select BC547C only when wide hFE tolerance is acceptable and higher typical fT justifies gain variability |
| MPSA18 | Higher VCEO (50 V), same TO-92, hFE = 100–300 (typ), fT = 100 MHz min, Cob = 5 pF | Slightly higher voltage margin suits 48 V telecom interfaces; Cob increase may affect VHF oscillator Q-factor | Prefer MPSA18 where extended VCEO headroom is required and 100 MHz fT meets system frequency needs |
Compared with BC547C and MPSA18, the KSC815YTA offers tighter Y-class hFE control (120–240) and lower Cob (4 pF), making it preferable for production-grade RF oscillator and calibrated preamp designs where gain stability and parasitic capacitance directly impact performance.
Availability
KSC815YTA is available at Aetrix Electronics and suitable for AM/FM radio front-ends, portable audio preamplifiers, and LED flasher drivers requiring stable component supply, consistent parametric binning, and long-term industrial availability.
Supply support for KSC815YTA 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, sensors, and discrete devices for automotive, industrial, cloud computing, and consumer markets.
The KSC815YTA belongs to ON Semiconductor's legacy general-purpose bipolar transistor product line, originally developed by Fairchild and optimized for cost-sensitive, high-volume analog signal conditioning and switching applications.
FAQ
What is the pin configuration of the KSC815YTA?
The KSC815YTA uses a side-collector TO-92 package with pinout: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector. This differs from center-collector variants (e.g., KSC815YTC), and the marking "C815" on the device body confirms the KSC815YTA variant. Always verify orientation using the flat side and lead-down view per Fairchild's physical dimensions diagram.
What does the "Y" suffix mean in KSC815YTA?
The "Y" in KSC815YTA denotes the hFE classification bin: 120–240 at VCE = 1 V and IC = 50 mA. This tight gain range improves predictability in production amplifier designs versus broader bins like "R" (40–80) or "O" (70–140). The "TA" suffix indicates tape-and-reel (ammo) packaging per the ordering information table.
Is the KSC815YTA RoHS compliant?
Yes, the KSC815YTA is RoHS compliant and lead-free per ON Semiconductor's product change notices and material declarations. It meets JEDEC J-STD-609 Category 1a for lead-free finish and complies with EU Directive 2011/65/EU. Full compliance documentation is available through ON Semiconductor's quality portal using the KSC815YTA part number.
Can the KSC815YTA replace the KSC815YTC in a PCB layout?
No - the KSC815YTA (side-collector: E-B-C) and KSC815YTC (center-collector: E-C-B) have different pinouts and are not pin-compatible. Swapping them without board revision will reverse collector and base connections, causing circuit failure. Always match the suffix to the intended pin configuration and validate against the schematic.
What is the maximum power dissipation for the KSC815YTA at 70°C ambient?
At TA = 70°C, the KSC815YTA's maximum allowable power dissipation is derated from its 400 mW rating at 25°C. Using RθJA = 310 °C/W, the junction temperature rise is limited to 80°C (150°C − 70°C), yielding PC(max) = 80°C ÷ 310 °C/W ≈ 258 mW. Exceeding this risks thermal runaway or accelerated degradation.
KSC815YTA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Packaging:
- Tape & Reel (TR)
- 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
KSC815YTA FAQ
1.How can I place an order for KSC815YTA through Aetrix?
Please submit a Request for Quotation (RFQ) for KSC815YTA 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 KSC815YTA reliable?
The price and inventory of KSC815YTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSC815YTA is usually 5 days.
3.What payment methods are accepted for KSC815YTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSC815YTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSC815YTA?
KSC815YTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSC815YTA 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 KSC815YTA?
For technical support, including KSC815YTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSC815YTA requirements.
6.How does Aetrix verify that KSC815YTA is sourced from the original manufacturer or authorized distributors?
All KSC815YTA 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 KSC815YTA meets industry standards.
7.What is the process for return or replacement of KSC815YTA?
All KSC815YTA units undergo pre-shipment inspection (PSI). If there is an issue with KSC815YTA, 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 KSC815YTA part is unused and in its original packaging.
Return procedure for KSC815YTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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