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onsemi KSC2787RBU
- Part No.:
- KSC2787RBU
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 Short Body
- Datasheet:
-
KSC2787RBU.pdf
- Description:
- TRANS NPN 30V 0.05A TO-92S
- Quantity:
- Payment:
- Shipping:
Inventory:6,540
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Product details
Overview
KSC2787RBU from Fairchild Semiconductor is an NPN epitaxial silicon transistor designed for RF amplification, mixing, conversion, oscillation, and IF stages in FM/AM receivers. It features VCEO=30V, fT=300MHz (typ), Cob=2.0pF (typ), hFE=40–80 (R-class), and TO-92S package for compact high-frequency signal path integration.
For engineers reviewing the KSC2787RBU datasheet, pinout, applications, or equivalent options, key selection criteria include its 300MHz fT, low 2.0pF output capacitance, R-grade hFE binning, VCEO rating, and TO-92S thermal and layout constraints in RF front-end designs.
Technical Context
This transistor operates as a general-purpose RF amplifier with optimized high-frequency gain and low parasitic capacitance. Its fT of 300MHz (typ) at IC=1mA and VCE=6V enables stable amplification up to VHF band, while Cob=2.0pF (typ) at VCB=6V minimizes Miller effect in tuned amplifier and oscillator configurations.
The R-class hFE range (40–80) ensures predictable biasing in fixed-gain RF stages, and VCEO=30V supports operation in AM/FM IF amplifiers with typical collector supply rails of 12–24V. Saturation voltage VCE(sat)=0.08V (min) at IC=10mA/IB=1mA confirms suitability for Class-A linear amplification rather than switching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 30 V - Supports collector supply rails up to 30V in AM/FM IF and RF amplifier stages |
| fT | 300 MHz (typ) - Enables stable small-signal amplification through VHF band (up to ~100 MHz practical design margin) |
| Cob | 2.0 pF (typ) - Minimizes Miller capacitance for improved stability and bandwidth in common-emitter RF amps |
| hFE (R-class) | 40–80 - Tight DC current gain binning for consistent bias point setting in production RF modules |
| VCE(sat) | 0.08 V (min) at IC=10mA/IB=1mA - Ensures low conduction loss and linearity in Class-A RF amplifiers |
| PC | 250 mW - Limits continuous power handling; requires thermal derating above 25°C ambient in enclosed RF assemblies |
Pinout & Package
Package: TO-92S - 3-lead plastic package with 1.27 mm lead pitch, 3.72 mm body height, and 2.86 mm body width; optimized for manual and automated insertion in RF PCBs with minimal lead inductance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current sink terminal | Connected to ground or emitter degeneration resistor; lowest impedance node for RF return path |
| 2 (Collector) | Current source terminal | Drives tuned LC load or next stage; requires careful trace routing to minimize parasitic inductance |
| 3 (Base) | Control input terminal | Receives bias current or RF drive; sensitive to stray capacitance due to low input impedance |
Key Features
| Feature | Design Value |
|---|---|
| High fT with low Cob | 300MHz fT + 2.0pF Cob enables wideband RF gain without external neutralization |
| R-class hFE binning | 40–80 hFE range simplifies production bias network design and reduces unit-to-unit gain variation |
| Low VCE(sat) | 0.08V saturation voltage preserves dynamic range and linearity in Class-A RF amplifiers |
| TO-92S footprint | Compact 3.72mm height allows dense placement in multi-stage IF modules without thermal crowding |
Applications
| FM Receiver IF Amplifier | AM Band Oscillator |
|---|---|
Use Scenario: Intermediate frequency amplification in dual-conversion FM radio receivers operating at 10.7 MHz. IC Role / Device Role / Timing Role: NPN RF amplifier in common-emitter configuration with tuned collector load. Use Value: 300MHz fT provides ample gain margin at 10.7MHz; 2.0pF Cob ensures stable selectivity without neutralization. | Use Scenario: Local oscillator stage generating 10.245 MHz signal for AM broadcast band mixing. IC Role / Device Role / Timing Role: NPN transistor in Colpitts oscillator topology with ceramic resonator feedback. Use Value: Low Cob minimizes frequency drift; R-class hFE ensures reliable startup across temperature and unit variance. |
| RF Pre-amplifier (VHF) | FM Mixer Stage |
Use Scenario: First-stage low-noise amplification of 88–108 MHz FM broadcast signals before filtering and demodulation. IC Role / Device Role / Timing Role: Common-emitter RF amplifier with emitter degeneration for gain stability. Use Value: 300MHz fT supports full FM band; TO-92S package allows short input trace lengths to reduce noise pickup. | Use Scenario: Balanced mixer core converting 10.7 MHz IF to baseband audio in FM demodulator ICs. IC Role / Device Role / Timing Role: Switching-mode active mixer using base-driven NPN pair configuration. Use Value: Low VCE(sat) and fast fT enable clean switching transitions and minimal intermodulation distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN RF transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 2SC3356 | fT=7GHz (typ), Cob=0.3pF, VCEO=12V - higher speed but lower voltage rating | Better for UHF/VHF broadband amps >500MHz; unsuitable for 30V IF stages | Select 2SC3356 only when fT >1GHz and VCEO ≤12V are acceptable |
| BC547C | fT=300MHz (min), Cob=4.5pF, hFE=420–800 - wider hFE spread, higher Cob, same VCEO | General-purpose use; less stable in tuned RF circuits due to higher Cob and hFE variability | Choose BC547C only for non-critical, low-frequency amplification where cost outweighs RF performance |
Compared with 2SC3356 and BC547C, the KSC2787RBU delivers optimal balance of 30V VCEO, 300MHz fT, and 2.0pF Cob for AM/FM IF and VHF front-end stages-making it more robust than 2SC3356 in higher-voltage designs and more stable than BC547C in tuned RF applications.
Availability
KSC2787RBU is available at Aetrix Electronics and suitable for FM/AM receiver IF amplifiers, RF pre-amplifiers, oscillator circuits, and mixer stages requiring stable component supply and consistent R-grade hFE binning.
Supply support for KSC2787RBU 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in discrete power devices, analog ICs, and interface solutions before its acquisition by ON Semiconductor in 2016.
The KSC2787RBU belongs to Fairchild's legacy RF transistor product line, engineered specifically for high-fidelity AM/FM broadcast receiver signal chains requiring stable gain, low noise, and repeatable RF performance in consumer and industrial radios.
FAQ
What is the hFE range for KSC2787RBU?
The KSC2787RBU is R-class binned with hFE specified from 40 to 80 at VCE=6V and IC=1mA. This tight gain range ensures predictable DC biasing and consistent small-signal gain across production units in RF amplifier and oscillator circuits using the KSC2787RBU.
What does the 'R' suffix indicate in KSC2787RBU?
The 'R' in KSC2787RBU denotes the hFE classification bin-specifically, a DC current gain range of 40–80. This distinguishes it from 'O' (70–140) and 'Y' (120–240) variants. The full part number KSC2787RBU identifies the R-bin device in TO-92S package with standard lead finish.
Is KSC2787RBU suitable for VHF amplifier designs?
Yes, KSC2787RBU is suitable for VHF amplifier designs up to ~100 MHz. Its 300MHz fT (typ), low 2.0pF Cob, and stable R-class hFE make it appropriate for 88–108 MHz FM band pre-amplifiers and buffer stages where moderate gain and thermal reliability are required in the KSC2787RBU implementation.
What is the maximum power dissipation for KSC2787RBU?
The KSC2787RBU has a maximum collector power dissipation (PC) of 250 mW at Ta=25°C. Derating is required above 25°C ambient-typically 2.5 mW/°C-so actual usable power in enclosed or elevated-temperature environments must be calculated based on heatsinking and airflow when deploying the KSC2787RBU.
Can KSC2787RBU replace BC547 in RF circuits?
No-KSC2787RBU is not a direct replacement for BC547 in RF circuits. While both are NPN transistors, KSC2787RBU offers lower Cob (2.0pF vs. 4.5pF) and tighter hFE binning (40–80 vs. 420–800), making it superior for tuned RF stages. Substituting BC547 may cause instability or reduced gain in circuits designed for the KSC2787RBU's RF-optimized characteristics.
KSC2787RBU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 Short Body
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 50 mA
- Voltage - Collector Emitter Breakdown (Max):
- 30 V
- Vce Saturation (Max) @ Ib, Ic:
- 300mV @ 1mA, 10mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 40 @ 1mA, 6V
- Power - Max:
- 250 mW
- Frequency - Transition:
- 300MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92S
KSC2787RBU FAQ
1.How can I place an order for KSC2787RBU through Aetrix?
Please submit a Request for Quotation (RFQ) for KSC2787RBU 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 KSC2787RBU reliable?
The price and inventory of KSC2787RBU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSC2787RBU is usually 5 days.
3.What payment methods are accepted for KSC2787RBU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSC2787RBU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSC2787RBU?
KSC2787RBU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSC2787RBU 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 KSC2787RBU?
For technical support, including KSC2787RBU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSC2787RBU requirements.
6.How does Aetrix verify that KSC2787RBU is sourced from the original manufacturer or authorized distributors?
All KSC2787RBU 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 KSC2787RBU meets industry standards.
7.What is the process for return or replacement of KSC2787RBU?
All KSC2787RBU units undergo pre-shipment inspection (PSI). If there is an issue with KSC2787RBU, 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 KSC2787RBU part is unused and in its original packaging.
Return procedure for KSC2787RBU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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