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

onsemi KSC1623YMTF

Name: KSC1623YMTF
Brand: onsemi
SKU: KSC1623YMTF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KSC1623YMTF

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: KSC1623YMTF.pdf

Description:: TRANS NPN 50V 0.1A SOT-23-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

KSC1623YMTF from ON Semiconductor is an NPN epitaxial silicon transistor in SOT-23 package, rated for 50 V V_CEO, 100 mA I_C, and 250 MHz f_T, with h_FE range 135–270 (Y-class), used in low-frequency amplification and high-frequency oscillator circuits.

For engineers reviewing the KSC1623YMTF datasheet, pinout, applications, or equivalent options, key selection criteria include V_CEO/V_CBO voltage margin, h_FE classification consistency, saturation voltage at 100 mA drive, thermal resistance (625 °C/W), and SOT-23 footprint compatibility in space-constrained analog designs.

Technical Context

This discrete NPN transistor employs epitaxial base construction to support stable DC current gain across collector currents from 1 mA to 100 mA, with verified f_T of 250 MHz under V_CE = 6 V, I_C = 10 mA conditions - confirming suitability for RF oscillator biasing and broadband small-signal amplification.

Its complementary pairing with KSA812 enables push-pull configurations in audio and switching applications; the device operates reliably up to 150 °C junction temperature and exhibits low output capacitance (3 pF at V_CB = 6 V), minimizing parasitic loading in tuned circuits.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	50 V - maximum safe collector-emitter voltage before breakdown; defines headroom for amplifier stage supply rails
I_C	100 mA - continuous collector current rating; sets upper limit for load-driving capability in linear/switching modes
f_T	250 MHz - unity-gain bandwidth; confirms usable gain up to VHF band in oscillator and RF amplifier roles
h_FE (Y-class)	135–270 - guaranteed DC current gain range at V_CE = 6 V, I_C = 1 mA; ensures predictable bias stability in amplifier designs
V_CE(sat)	0.15–0.30 V at I_C = 100 mA, I_B = 10 mA - low saturation voltage reduces power loss in switching applications
R_θJA	625 °C/W - junction-to-ambient thermal resistance on standard FR-4 PCB; determines allowable power dissipation at ambient temperature

Pinout & Package

SOT-23 3-lead plastic package (JEDEC TO-236AB), low-profile surface-mount format with 1.30 mm × 2.92 mm footprint and 1.20 mm max height; optimized for automated placement and reflow soldering in high-density PCB layouts.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Control input terminal	Receives base current to modulate collector current; requires external bias network for stable DC operating point
2 (Emitter)	Current return path	Common reference node for emitter-follower or grounded-emitter configurations; connects to ground or emitter resistor
3 (Collector)	Output current terminal	Delivers amplified or switched current to load; must be isolated from base via layout to minimize Miller capacitance

Key Features

Feature	Design Value
Low-frequency amplifier capability	Validated h_FE ≥135 at 1 mA supports stable biasing in audio preamp and sensor signal conditioning stages
High-frequency oscillator support	250 MHz f_T and 3 pF C_ob enable reliable operation in Colpitts and Hartley VHF oscillator topologies
Complementary pairing with KSA812	Matched voltage/current ratings allow direct use in Class-B and AB push-pull output stages without redesign
Y-class h_FE binning	135–270 gain range provides predictable performance across production lots, reducing calibration overhead

Applications

Audio Pre-amplifier Stage	RF Local Oscillator
Use Scenario: Amplifying weak microphone or line-level signals prior to ADC sampling in portable audio devices. IC Role / Device Role / Timing Role: Discrete NPN transistor configured as common-emitter amplifier with fixed bias network. Use Value: Y-class h_FE ensures consistent gain across units; low V_CE(sat) minimizes distortion at peak signal swing.	Use Scenario: Generating 30–100 MHz local oscillator signal for AM/FM receiver front-ends. IC Role / Device Role / Timing Role: Active device in Colpitts oscillator circuit with parallel LC tank. Use Value: 250 MHz f_T and 3 pF C_ob support stable oscillation with low phase noise and minimal tuning drift.
Switching Regulator Driver	LED Constant-Current Bias
Use Scenario: Driving gate of power MOSFET in low-power DC-DC buck converter feedback loop. IC Role / Device Role / Timing Role: Low-side switch controlling PWM timing signal delivery to power stage. Use Value: 100 mA I_C rating and 0.30 V max V_CE(sat) ensure fast turn-on with minimal conduction loss.	Use Scenario: Providing stable bias current to high-brightness LED strings in indicator or backlight modules. IC Role / Device Role / Timing Role: Current-source transistor in emitter-degenerated configuration. Use Value: Tight h_FE binning (135–270) and low ICBO (<0.1 μA) maintain ±3% current accuracy over temperature.

Audio Pre-amplifier Stage

RF Local Oscillator

Use Scenario: Amplifying weak microphone or line-level signals prior to ADC sampling in portable audio devices.

IC Role / Device Role / Timing Role: Discrete NPN transistor configured as common-emitter amplifier with fixed bias network.

Use Value: Y-class h_FE ensures consistent gain across units; low V_CE(sat) minimizes distortion at peak signal swing.

Use Scenario: Generating 30–100 MHz local oscillator signal for AM/FM receiver front-ends.

IC Role / Device Role / Timing Role: Active device in Colpitts oscillator circuit with parallel LC tank.

Use Value: 250 MHz f_T and 3 pF C_ob support stable oscillation with low phase noise and minimal tuning drift.

Switching Regulator Driver

LED Constant-Current Bias

Use Scenario: Driving gate of power MOSFET in low-power DC-DC buck converter feedback loop.

IC Role / Device Role / Timing Role: Low-side switch controlling PWM timing signal delivery to power stage.

Use Value: 100 mA I_C rating and 0.30 V max V_CE(sat) ensure fast turn-on with minimal conduction loss.

Use Scenario: Providing stable bias current to high-brightness LED strings in indicator or backlight modules.

IC Role / Device Role / Timing Role: Current-source transistor in emitter-degenerated configuration.

Use Value: Tight h_FE binning (135–270) and low ICBO (<0.1 μA) maintain ±3% current accuracy over temperature.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBT3904LT1G	h_FE min 100 (vs. KSC1623YMTF Y-class min 135); f_T 300 MHz; same SOT-23 package	Higher f_T suits faster switching but lower h_FE may require larger base drive in linear apps	Select when higher speed is prioritized over guaranteed mid-range gain stability
BC847B,215	h_FE 200–450 (B-class); V_CEO 45 V (vs. 50 V); same SOT-23 footprint	Lower V_CEO limits rail headroom; wider h_FE spread increases calibration need	Choose where 45 V rating suffices and broader gain tolerance is acceptable

Compared with MMBT3904LT1G and BC847B,215, the KSC1623YMTF offers tighter h_FE control (135–270) and higher V_CEO margin (50 V), making it preferable for precision low-noise amplification and oscillator circuits where gain consistency and voltage headroom are critical.

Availability

KSC1623YMTF is available at Aetrix Electronics and suitable for audio pre-amplifier stages, RF local oscillators, switching regulator drivers, and LED constant-current bias circuits requiring stable component supply and SOT-23 footprint compatibility.

Supply support for KSC1623YMTF 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 and signal management solutions, with heritage from Fairchild Semiconductor's analog and discrete portfolio.

The KSC1623YMTF belongs to ON Semiconductor's legacy general-purpose bipolar transistor product line, designed for cost-sensitive, high-reliability analog signal conditioning and RF timing applications in consumer, industrial, and communications equipment.

FAQ

What is the h_FE range for KSC1623YMTF?

The KSC1623YMTF is Y-class binned with a guaranteed DC current gain (h_FE) range of 135 to 270 when measured at V_CE = 6 V and I_C = 1 mA. This specification is confirmed in the official datasheet Rev. 1.1.0 and applies specifically to the KSC1623YMTF marking 'C1Y'. The h_FE range ensures predictable biasing in amplifier and oscillator circuits without requiring per-unit trimming.

What package type does KSC1623YMTF use?

KSC1623YMTF uses the SOT-23 3-lead plastic package (JEDEC TO-236AB), with standardized pinout: Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector. Its dimensions are 1.30 mm × 2.92 mm × 1.20 mm max, and it is supplied in tape-and-reel format per ordering information in the KSC1623 datasheet. This package supports high-volume automated assembly and thermal performance validated on FR-4 PCBs.

Is KSC1623YMTF suitable for RF oscillator applications?

Yes, KSC1623YMTF is explicitly designated for high-frequency oscillator use per its datasheet Features section. It delivers a current gain bandwidth product (f_T) of 250 MHz at V_CE = 6 V and I_C = 10 mA, and exhibits low output capacitance (C_ob = 3 pF at V_CB = 6 V), both validated parameters that support stable Colpitts and Hartley oscillator operation up to ~100 MHz. These values are measured and published for the exact KSC1623YMTF variant.

What is the maximum collector-emitter voltage rating for KSC1623YMTF?

The maximum collector-emitter voltage (V_CEO) for KSC1623YMTF is 50 V, as specified in the Absolute Maximum Ratings table of the official datasheet. This rating applies at T_A = 25°C and defines the upper limit for safe DC or peak AC voltage across the collector and emitter terminals. Exceeding this value risks irreversible breakdown and device failure.

How does KSC1623YMTF relate to KSA812?

KSC1623YMTF is the NPN complement to the PNP transistor KSA812, as stated in the Features section of the KSC1623 datasheet. Both share matched voltage ratings (V_CEO = 50 V for KSC1623YMTF, V_CEO = −50 V for KSA812), current capability (100 mA), and thermal characteristics, enabling direct use in Class-B and AB push-pull amplifier stages without recalculating bias networks or layout changes for the KSC1623YMTF/KSA812 pair.

KSC1623YMTF Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 100 mA

Voltage - Collector Emitter Breakdown (Max):: 50 V

Vce Saturation (Max) @ Ib, Ic:: 300mV @ 10mA, 100mA

Current - Collector Cutoff (Max):: 100nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 135 @ 1mA, 6V

Power - Max:: 200 mW

Frequency - Transition:: 250MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

KSC1623YMTF FAQ

1.How can I place an order for KSC1623YMTF through Aetrix?

Please submit a Request for Quotation (RFQ) for KSC1623YMTF 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 KSC1623YMTF reliable?

The price and inventory of KSC1623YMTF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSC1623YMTF is usually 5 days.

3.What payment methods are accepted for KSC1623YMTF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSC1623YMTF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KSC1623YMTF?

KSC1623YMTF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KSC1623YMTF 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 KSC1623YMTF?

For technical support, including KSC1623YMTF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSC1623YMTF requirements.

6.How does Aetrix verify that KSC1623YMTF is sourced from the original manufacturer or authorized distributors?

All KSC1623YMTF 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 KSC1623YMTF meets industry standards.

7.What is the process for return or replacement of KSC1623YMTF?

All KSC1623YMTF units undergo pre-shipment inspection (PSI). If there is an issue with KSC1623YMTF, 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 KSC1623YMTF part is unused and in its original packaging.

Return procedure for KSC1623YMTF:

1.Submit a request within 90 days.

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

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