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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Bipolar RF Transistors

onsemi KSC1393OTA

Name: KSC1393OTA
Brand: onsemi
SKU: KSC1393OTA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KSC1393OTA

Manufacturer:: onsemi

Category:: Bipolar RF Transistors

Package:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Datasheet:: KSC1393OTA.pdf

Description:: RF TRANS NPN 30V 700MHZ TO92-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

KSC1393OTA from Fairchild Semiconductor is an NPN epitaxial silicon transistor designed for VHF tuner RF amplification with forward AGC capability. It delivers f_T = 700 MHz (typ), NF ≤ 3.0 dB at 200 MHz, and CRE ≤ 0.5 pF, operating at V_CEO = 30 V, I_C = 20 mA, and P_C = 250 mW in TV tuner front-end stages.

For engineers reviewing the KSC1393OTA datasheet, pinout, applications, or equivalent options, key selection criteria include its high f_T, low noise figure, tight h_FE classification (R/O/Y), TO-92 package compatibility, and verified performance in 200 MHz RF gain blocks with AGC control.

Technical Context

The KSC1393OTA is optimized for VHF-band RF amplification where forward AGC functionality is required. Its h_FE classification (R: 40–80, O: 60–140, Y: 90–180) enables binning for consistent gain matching across production lots in tuner modules.

It operates with low reverse transfer capacitance (CRE ≤ 0.5 pF) and exhibits stable power gain (G_PE = 20–24 dB at 200 MHz), supporting high-isolation, low-distortion signal amplification in TV tuner IF/RF stages without external neutralization.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	30 V - supports operation in standard VHF tuner supply rails up to 30 V DC
f_T	700 MHz (typ) - enables stable amplification through upper VHF band (174–230 MHz)
NF	≤3.0 dB at 200 MHz - meets low-noise requirement for analog TV tuner front-end sensitivity
CRE	≤0.5 pF - minimizes unwanted feedback, eliminating need for neutralization in tuned amplifier designs
h_FE	40–180 (classified R/O/Y) - allows gain-binned selection for matched-stage design in multi-transistor tuner modules
G_PE	20–24 dB at 200 MHz - provides usable small-signal gain without external matching networks
I_AGC	−10 to −12 mA - defines emitter current range for reliable forward AGC response at GR = −30 dB

Pinout & Package

Supplied in TO-92 plastic package with standardized lead configuration: 1 = Base, 2 = Emitter, 3 = Collector. Package dimensions conform to JEDEC TO-92 outline (3.86 mm × 1.27 mm × 4.58 mm).

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Control electrode for forward-biased junction	Accepts RF input signal and AGC bias; requires impedance-matched drive for optimal noise performance
2 (Emitter)	Current source terminal	Connected to AGC-controlled current sink; polarity and magnitude directly set gain reduction level
3 (Collector)	Output current terminal	Drives tuned collector load; high f_T ensures minimal phase shift across VHF band

Key Features

Feature	Design Value
Forward AGC support	Verified I_AGC = −10 to −12 mA at GR = −30 dB enables direct integration into analog TV tuner AGC loops
High f_T / low NF trade-off	f_T = 700 MHz with NF ≤ 3.0 dB balances bandwidth and sensitivity for VHF reception
Low CRE	CRE ≤ 0.5 pF reduces internal feedback, enabling single-stage stable amplification without neutralization
h_FE binning	R/O/Y classification allows selective assembly of matched transistors in multi-stage RF chains

Applications

Analog TV VHF Tuner RF Amplifier	VHF Band AGC-Controlled Preamp
Use Scenario: Front-end amplification in analog terrestrial TV tuners covering 47–230 MHz VHF bands. IC Role / Device Role / Timing Role: NPN RF transistor providing voltage-controlled gain via forward AGC applied to emitter. Use Value: Delivers 20–24 dB power gain with ≤3.0 dB noise figure, enabling compliant sensitivity per ITU-R BT.470.	Use Scenario: Gain-stabilized preamplifier stage in VHF receivers requiring automatic signal-level compensation. IC Role / Device Role / Timing Role: Forward AGC transistor where emitter current modulates transconductance linearly over −10 to −12 mA range. Use Value: Maintains constant output amplitude across ±20 dB input variation without external op-amp or detector circuitry.
Legacy Broadcast Receiver IF Amplifier	VHF Signal Distribution Amplifier
Use Scenario: Intermediate-frequency amplification in analog broadcast receivers operating at 38–46 MHz. IC Role / Device Role / Timing Role: High-f_T NPN transistor biased for Class-A small-signal amplification with fixed V_CE = 10 V. Use Value: Achieves flat gain response and low intermodulation distortion due to low CRE and high h_FE consistency.	Use Scenario: Low-noise distribution amplifier splitting VHF antenna signals to multiple analog demodulators. IC Role / Device Role / Timing Role: Single-ended RF gain block with emitter degeneration for improved linearity and port-to-port isolation. Use Value: Enables ≥15 dB channel separation between outputs using standard 50 Ω PCB layout without shielding.

Analog TV VHF Tuner RF Amplifier

VHF Band AGC-Controlled Preamp

Use Scenario: Front-end amplification in analog terrestrial TV tuners covering 47–230 MHz VHF bands.

IC Role / Device Role / Timing Role: NPN RF transistor providing voltage-controlled gain via forward AGC applied to emitter.

Use Value: Delivers 20–24 dB power gain with ≤3.0 dB noise figure, enabling compliant sensitivity per ITU-R BT.470.

Use Scenario: Gain-stabilized preamplifier stage in VHF receivers requiring automatic signal-level compensation.

IC Role / Device Role / Timing Role: Forward AGC transistor where emitter current modulates transconductance linearly over −10 to −12 mA range.

Use Value: Maintains constant output amplitude across ±20 dB input variation without external op-amp or detector circuitry.

Legacy Broadcast Receiver IF Amplifier

VHF Signal Distribution Amplifier

Use Scenario: Intermediate-frequency amplification in analog broadcast receivers operating at 38–46 MHz.

IC Role / Device Role / Timing Role: High-f_T NPN transistor biased for Class-A small-signal amplification with fixed V_CE = 10 V.

Use Value: Achieves flat gain response and low intermodulation distortion due to low CRE and high h_FE consistency.

Use Scenario: Low-noise distribution amplifier splitting VHF antenna signals to multiple analog demodulators.

IC Role / Device Role / Timing Role: Single-ended RF gain block with emitter degeneration for improved linearity and port-to-port isolation.

Use Value: Enables ≥15 dB channel separation between outputs using standard 50 Ω PCB layout without shielding.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN RF amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SC3356	f_T = 6.5 GHz (min), NF = 1.1 dB (typ) at 1 GHz; higher V_CEO = 20 V; SOT-23 package	Targeted at UHF/1.5 GHz applications; not validated for forward AGC at 200 MHz	Select only if migrating to UHF or requiring ultra-low noise beyond VHF band
KSC1845	f_T = 500 MHz (max), NF = 3.5 dB (max) at 200 MHz; same TO-92 package; no published I_AGC spec	Lacks documented forward AGC performance; suitable for fixed-gain VHF amplifiers only	Use when AGC functionality is unnecessary and lower cost is prioritized over gain-bandwidth margin

Compared with 2SC3356 and KSC1845, the KSC1393OTA uniquely combines verified forward AGC behavior, VHF-optimized f_T/NF balance, and TO-92 manufacturability-making it irreplaceable in legacy analog TV tuner designs requiring emitter-driven gain control.

Availability

KSC1393OTA is available at Aetrix Electronics and suitable for analog TV tuners, VHF broadcast receivers, legacy RF test equipment, and AGC-based signal conditioning circuits requiring stable component supply and long-lifecycle support.

Supply support for KSC1393OTA 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 RF transistors before its acquisition by ON Semiconductor in 2016.

The KSC1393OTA belongs to Fairchild's legacy VHF RF transistor family, engineered specifically for analog television tuner applications requiring forward AGC, low noise, and high gain-bandwidth product in through-hole packaging.

FAQ

What is the maximum collector-emitter voltage rating for KSC1393OTA?

The KSC1393OTA has a maximum collector-emitter voltage (V_CEO) rating of 30 V at T_a = 25°C. This rating is confirmed in the Absolute Maximum Ratings table and applies under continuous DC operation with proper thermal management. Exceeding this voltage risks avalanche breakdown and permanent device failure. The KSC1393OTA must be operated within this limit in all VHF tuner and RF amplifier designs.

Does KSC1393OTA support forward AGC, and how is it implemented?

Yes, the KSC1393OTA supports forward AGC via controlled emitter current. Its datasheet specifies I_AGC = −10 to −12 mA at GR = −30 dB and f = 200 MHz, confirming functional AGC behavior. In practice, this means applying a negative current to the emitter terminal modulates transconductance linearly. The KSC1393OTA is explicitly designated for "TV VHF Tuner RF Amplifier (Forward AGC)" in its application note.

What is the typical current gain bandwidth product (f_T) of KSC1393OTA?

The typical current gain bandwidth product (f_T) of the KSC1393OTA is 700 MHz, measured at V_CE = 10 V and I_C = 3 mA. This value is specified in the Electrical Characteristics table under "Typ." column and is further validated in Figure 5 (Current Gain-Bandwidth Product) of the datasheet. The KSC1393OTA maintains usable gain up to upper VHF frequencies due to this f_T.

Is KSC1393OTA available in a surface-mount package?

No, the KSC1393OTA is exclusively offered in the through-hole TO-92 package, as confirmed by the Package Dimensions diagram and ordering information in the Fairchild datasheet. No SMT variant (e.g., SOT-23 or SC-70) was released for this part number. Designers requiring surface-mount compatibility must evaluate alternatives such as 2SC3356, but those lack the KSC1393OTA's verified forward AGC specification.

What h_FE classification does KSC1393OTA use, and why does it matter?

The KSC1393OTA is classified into three h_FE bins: R (40–80), O (60–140), and Y (90–180), defined at V_CE = 10 V and I_C = 2 mA. This binning enables precise gain matching in multi-stage tuner amplifiers. Selecting the correct KSC1393OTA variant ensures predictable cascade gain and stability-critical in analog TV receiver designs where uncontrolled h_FE spread causes tuning drift or oscillation.

KSC1393OTA 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

Voltage - Collector Emitter Breakdown (Max):: 30V

Frequency - Transition:: 700MHz

Noise Figure (dB Typ @ f):: 2dB ~ 3dB @ 200MHz

Gain:: 20dB ~ 24dB

Power - Max:: 250mW

DC Current Gain (hFE) (Min) @ Ic, Vce:: 60 @ 2mA, 10V

Current - Collector (Ic) (Max):: 20mA

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

KSC1393OTA FAQ

1.How can I place an order for KSC1393OTA through Aetrix?

Please submit a Request for Quotation (RFQ) for KSC1393OTA 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 KSC1393OTA reliable?

The price and inventory of KSC1393OTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSC1393OTA is usually 5 days.

3.What payment methods are accepted for KSC1393OTA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSC1393OTA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KSC1393OTA?

KSC1393OTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KSC1393OTA 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 KSC1393OTA?

For technical support, including KSC1393OTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSC1393OTA requirements.

6.How does Aetrix verify that KSC1393OTA is sourced from the original manufacturer or authorized distributors?

All KSC1393OTA 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 KSC1393OTA meets industry standards.

7.What is the process for return or replacement of KSC1393OTA?

All KSC1393OTA units undergo pre-shipment inspection (PSI). If there is an issue with KSC1393OTA, 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 KSC1393OTA part is unused and in its original packaging.

Return procedure for KSC1393OTA:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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