My Inquiry
My Account
onsemi KSC815YBU
- Part No.:
- KSC815YBU
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
KSC815YBU.pdf
- Description:
- TRANS NPN 45V 0.2A TO-92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,941
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
KSC815YBU 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. It operates in TO-92 package with side-collector pinout (Emitter–Base–Collector) and is commonly used in audio preamplifiers and RF signal generators.
For engineers reviewing the KSC815YBU datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal limits, saturation behavior, gain-bandwidth performance, and real-world use context - all confirmed against Fairchild/ON Semiconductor's official KSC815 Rev. 1.4 documentation.
Technical Context
The KSC815YBU is a general-purpose bipolar junction transistor optimized for linear amplification and tuned oscillator operation up to ~200 MHz. Its Y-class hFE bin (120–240 at VCE = 1 V, IC = 50 mA) ensures predictable DC bias stability, while its Cob = 4 pF at VCB = 10 V supports stable high-frequency tuning.
It features low VCE(sat) = 0.15–0.40 V at IC = 150 mA/IB = 15 mA and VBE(sat) = 0.83–1.10 V under same conditions, enabling efficient switching in low-power analog stages. The device is not rated for automotive or safety-critical use per Fairchild's Authorized Use policy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO | 60 V - Maximum reverse voltage between collector and base before breakdown; defines safe bias margin in common-base configurations. |
| VCEO | 45 V - Maximum collector-emitter voltage with base open; sets upper limit for amplifier supply rails. |
| IC | 200 mA - Continuous collector current rating; determines maximum load drive capability in linear or switching modes. |
| hFE (Y-class) | 120–240 - DC current gain range at VCE = 1 V, IC = 50 mA; enables precise bias network design for stable Q-point selection. |
| fT | 100–200 MHz - Current gain bandwidth product; confirms suitability for VHF oscillator and narrowband RF amplifier applications. |
| Cob | 4 pF at VCB = 10 V - Output capacitance; critical for tank circuit resonance accuracy and frequency stability in oscillator designs. |
| PC | 400 mW - Maximum power dissipation at TA = 25°C; constrains usable output swing and thermal derating in PCB layouts. |
Pinout & Package
Package: TO-92 (3-lead, molded plastic, side-collector configuration). Pinout follows non-"-C" suffix convention: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Emitter | Current sink terminal for NPN operation | Reference node for biasing; connects to ground or emitter degeneration resistor in common-emitter amplifiers. |
| 2 - Base | Control input for minority-carrier injection | Receives forward-biased drive; requires current-limited source to set IC via hFE relationship. |
| 3 - Collector | Current source terminal under active mode | Connects to load or tuned circuit; voltage swing limited by VCEO = 45 V and thermal dissipation constraints. |
Key Features
| Feature | Design Value |
|---|---|
| Low-frequency amplifier + high-frequency oscillator dual role | Validated by fT ≥ 100 MHz and hFE stability across IC = 1–100 mA, supporting both audio gain and RF signal generation. |
| Y-class hFE binning (120–240) | Reduces variation in DC operating point across production lots, simplifying bias network design without trimming. |
| Low VCE(sat) (0.15–0.40 V) | Minimizes conduction loss in Class-A amplifier output stages and improves efficiency in oscillator collector loads. |
| TO-92 side-collector mechanical layout | Enables direct replacement in legacy designs using KSC815 variants without PCB rework or footprint change. |
| Complement to KSA539 PNP transistor | Allows matched-pair implementation in push-pull or differential amplifier topologies with symmetrical gain and thermal tracking. |
Applications
| Audio Preamp Stage | RF Local Oscillator |
|---|---|
Use Scenario: Low-noise voltage amplification of microphone or line-level signals prior to ADC sampling in consumer audio equipment. IC Role / Device Role / Timing Role: NPN small-signal amplifier in common-emitter configuration with emitter degeneration. Use Value: Y-class hFE ensures consistent gain across units; low VBE(on) = 0.60–0.90 V enables stable bias with minimal quiescent current drift. | Use Scenario: Fixed-frequency oscillator in UHF remote control transmitters or ISM-band sensor nodes. IC Role / Device Role / Timing Role: Active device in Colpitts or Hartley LC-tuned oscillator circuit. Use Value: fT up to 200 MHz and Cob = 4 pF support stable oscillation at 100–180 MHz with predictable start-up and phase noise performance. |
| DC Motor Driver (Low-Power) | Signal Level Shifter |
Use Scenario: On/off control of miniature 3–6 V brushed DC motors in toys or portable instrumentation. IC Role / Device Role / Timing Role: Single-stage switch in common-emitter configuration driving motor coil directly. Use Value: IC = 200 mA rating and VCE(sat) ≤ 0.40 V ensure full motor torque at low supply voltages without excessive heat buildup. | Use Scenario: Logic-level translation between 3.3 V microcontroller GPIO and 5 V analog front-end circuitry. IC Role / Device Role / Timing Role: Emitter-follower or common-emitter level translator with base driven by MCU output. Use Value: Low VBE(on) and tight hFE distribution allow predictable output swing and fast edge response without external pull-ups. |
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 |
|---|---|---|---|
| 2N3904 | Lower fT (300 MHz typ, but tested at IC = 10 mA only); hFE = 100–300 (no binning); Cob = 4.5 pF | Widely used in digital switching; less optimized for oscillator Q-factor due to higher Cob tolerance | Select when cost sensitivity outweighs RF stability needs; verify Cob impact on tank circuit Q in oscillator designs. |
| KSC1845YTA | Same TO-92 package; higher fT = 250 MHz; hFE = 120–240 (Y-bin); Cob = 3.5 pF; VCBO = 60 V identical | Better suited for >150 MHz oscillator designs requiring tighter capacitance control and higher gain-bandwidth | Prefer for upgraded RF performance where board space and pinout compatibility are retained. |
Compared with 2N3904 and KSC1845YTA, the KSC815YBU offers balanced fT and Cob for mid-VHF oscillators, tighter Y-bin hFE for analog gain consistency, and proven thermal reliability in continuous low-power amplification - making it optimal for cost-sensitive, non-automotive analog signal chains.
Availability
KSC815YBU is available at Aetrix Electronics and suitable for audio preamplifiers, RF local oscillators, and low-power DC motor drivers requiring stable component supply, consistent hFE binning, and TO-92 footprint compatibility.
Supply support for KSC815YBU 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 (formerly Fairchild Semiconductor) is a global supplier of energy-efficient semiconductor components, specializing in power management, analog, and discrete devices for industrial, computing, and consumer markets.
The KSC815 series belongs to ON Semiconductor's legacy general-purpose bipolar transistor portfolio, engineered for reliable linear amplification and oscillator functions in commercial-grade applications - not intended for automotive, aerospace, or life-support systems.
FAQ
What is the pin configuration of the KSC815YBU?
The KSC815YBU uses a TO-92 package with side-collector pinout: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector. This matches the non-"-C" suffix variant defined in Fairchild's KSC815 Rev. 1.4 datasheet and is distinct from center-collector versions like KSC815YBU-C.
What does the "Y" suffix mean in KSC815YBU?
The "Y" suffix in KSC815YBU denotes the hFE bin classification: 120–240 at VCE = 1 V and IC = 50 mA. This bin provides tighter DC current gain tolerance than standard R- or O-class variants, improving repeatability in bias-critical analog amplifier designs.
Is the KSC815YBU suitable for automotive applications?
No, the KSC815YBU is not qualified for automotive use. Per Fairchild's Authorized Use policy, it is designated for standard commercial applications only and explicitly excluded from transportation, safety-critical, or medical systems unless separately approved in writing by ON Semiconductor.
What is the maximum operating temperature for the KSC815YBU?
The KSC815YBU has a maximum junction temperature (TJ) of 150°C and a storage temperature range of –55°C to +150°C. Its thermal resistance RθJA is 310°C/W on a standard FR-4 PCB, so power dissipation must be derated above 25°C ambient to maintain safe TJ.
How does the KSC815YBU compare to the KSC815YTA?
The KSC815YBU and KSC815YTA share identical electrical specifications and TO-92 packaging, differing only in packing method: KSC815YBU is bulk-packed, while KSC815YTA uses ammo packing. Both are functionally interchangeable in circuit design and layout.
KSC815YBU 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:
- 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
KSC815YBU FAQ
1.How can I place an order for KSC815YBU through Aetrix?
Please submit a Request for Quotation (RFQ) for KSC815YBU 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 KSC815YBU reliable?
The price and inventory of KSC815YBU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSC815YBU is usually 5 days.
3.What payment methods are accepted for KSC815YBU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSC815YBU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSC815YBU?
KSC815YBU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSC815YBU 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 KSC815YBU?
For technical support, including KSC815YBU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSC815YBU requirements.
6.How does Aetrix verify that KSC815YBU is sourced from the original manufacturer or authorized distributors?
All KSC815YBU 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 KSC815YBU meets industry standards.
7.What is the process for return or replacement of KSC815YBU?
All KSC815YBU units undergo pre-shipment inspection (PSI). If there is an issue with KSC815YBU, 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 KSC815YBU part is unused and in its original packaging.
Return procedure for KSC815YBU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
KSC815YBU Tags
-
MMBT3906LT1G
onsemi
-
MMBT3904-7-F
Diodes Incorporated
-
MMBT3904LT1G
onsemi
-
MMBT3906-7-F
Diodes Incorporated
-
MMBT3904-TP
Micro Commercial Co
-
MMBT2222A-7-F
Diodes Incorporated
-
BC846BLT1G
onsemi
-
BC847B,215
Nexperia USA Inc.
-
SMMBT3904LT1G
onsemi
-
MMBT2222A-TP
Micro Commercial Co
-
MMBTA06LT1G
onsemi
-
MMBT2222ALT1G
onsemi
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
