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onsemi KSC2859OMTF
- Part No.:
- KSC2859OMTF
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
KSC2859OMTF.pdf
- Description:
- TRANS NPN 30V 0.5A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,978
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Product details
Overview
KSC2859OMTF from ON Semiconductor is an NPN bipolar junction transistor (BJT) optimized for general-purpose switching and amplification in low-voltage, medium-current applications. It features a DC current gain (hFE) of 120–240 at IC = 10 mA and VCE = 2 V, maximum collector-emitter voltage (VCEO) of 20 V, continuous collector current (IC) rating of 500 mA, and power dissipation (PD) of 200 mW in the SOT-23 package - used in LED drivers, signal buffering, and logic-level interface circuits.
For engineers reviewing the KSC2859OMTF datasheet, pinout, applications, or equivalent options, key selection considerations include its guaranteed hFE range at low IC, tight VCE(sat) specification (≤0.1 V @ IC/IB = 50 mA/5 mA), SOT-23 thermal performance, and compatibility with 3.3 V and 5 V digital control rails.
Technical Context
The KSC2859OMTF operates as a standard silicon NPN BJT with epitaxial base construction, enabling fast turn-on/turn-off times and stable gain across temperature. Its design targets discrete switching functions where low saturation voltage and predictable current amplification are required without integrated biasing or protection circuitry.
It is not a logic-level MOSFET or Darlington pair - it requires external base drive and exhibits typical BJT characteristics: exponential IC–VBE relationship, finite Early voltage (~50 V), and moderate fT (~200 MHz), making it suitable for audio preamplifier stages and digital output buffering up to ~10 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 20 V - Maximum allowable collector-to-emitter voltage before breakdown; sets upper rail limit for switch or amplifier stage. |
| IC (continuous) | 500 mA - Continuous collector current capability; defines max load current in switching applications. |
| hFE @ IC=10 mA | 120–240 - DC current gain range at mid-range bias; determines required base drive for target collector current. |
| VCE(sat) @ IC/IB=50 mA/5 mA | ≤0.1 V - Low saturation voltage ensures minimal power loss and voltage drop when fully on. |
| PD (TA=25°C) | 200 mW - Power dissipation limit at room ambient; constrains usable IC×VCE product in linear operation. |
| fT | 200 MHz - Transition frequency; indicates usable bandwidth for small-signal amplification up to ~10–20 MHz. |
Pinout & Package
Package: SOT-23 (TO-236AB), surface-mount, 3-pin plastic package with standard lead pitch of 0.95 mm and body dimensions 2.90 mm × 1.30 mm × 0.95 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current sink terminal | Reference node for base-emitter junction; connects to ground or low-side return path in common-emitter configuration. |
| 2 (Base) | Control input | Receives forward-bias current to enable conduction; requires series resistor to limit IB and prevent damage. |
| 3 (Collector) | Current source terminal | Delivers amplified IC to load; connects to positive supply via load in switching applications. |
Key Features
| Feature | Design Value |
|---|---|
| High hFE consistency | Guaranteed 120–240 range at IC = 10 mA enables predictable base drive sizing without margin overdesign. |
| Low VCE(sat) | ≤0.1 V at IC/IB = 50 mA/5 mA reduces conduction loss and self-heating in high-duty-cycle switches. |
| SOT-23 footprint | Standardized 3-pin package supports automated placement and reflow soldering; compatible with high-density PCB layouts. |
| Lead-free and RoHS compliant | Meets IPC-J-STD-020 moisture sensitivity level 1 (MSL1); no baking required prior to assembly. |
Applications
| LED Driver Stage | Microcontroller Interface Buffer |
|---|---|
Use Scenario: Driving 20–50 mA indicator LEDs from 3.3 V GPIO pins with current limiting. IC Role / Device Role / Timing Role: Discrete NPN switch providing current gain and voltage isolation between MCU output and LED load. Use Value: Enables direct GPIO control without exceeding MCU output current limits while maintaining <100 mV dropout. | Use Scenario: Level-shifting and current boosting between 3.3 V logic outputs and 5 V peripheral inputs. IC Role / Device Role / Timing Role: Active pull-up/pull-down buffer for open-collector or high-impedance bus signals. Use Value: Provides clean signal transition with <10 ns propagation delay and immunity to capacitive loading up to 50 pF. |
| Audio Preamp Input Stage | Power Supply Enable Switch |
Use Scenario: Low-noise voltage amplification of microphone or sensor signals in portable audio devices. IC Role / Device Role / Timing Role: Common-emitter small-signal amplifier with emitter degeneration for linearity and gain stability. Use Value: Delivers >30 dB voltage gain at 1 kHz with THD <0.5% at 100 mVpp output into 10 kΩ load. | Use Scenario: Enabling/disabling 5 V or 12 V subsystems (e.g., sensors, radios) using MCU-controlled on/off signaling. IC Role / Device Role / Timing Role: High-side or low-side enable switch controlling power rail sequencing. Use Value: Supports fast turn-on (<100 ns) and robust 500 mA steady-state current with thermal shutdown margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN switching and amplification applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBT2222ALT1G | VCEO = 40 V, hFE = 100–300, PD = 310 mW - higher voltage rating and power handling. | Preferred where system rail exceeds 20 V or higher IC derating margin is needed. | Select MMBT2222ALT1G if operating VCC > 20 V or requiring >200 mW dissipation headroom. |
| BC847BW | VCEO = 45 V, hFE = 200–450, same SOT-23 package - wider gain spread and higher voltage tolerance. | Used in precision bias networks and higher-gain analog stages where tighter hFE binning is not required. | Choose BC847BW when broader hFE range is acceptable and higher VCEO improves safety margin. |
Compared with MMBT2222ALT1G and BC847BW, the KSC2859OMTF offers tighter hFE control at low IC, lower VCE(sat), and optimized thermal resistance for compact 200 mW operation - making it preferred for space-constrained 3.3 V/5 V digital interface and LED driver designs where gain predictability and low dropout are critical.
Availability
KSC2859OMTF is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller interface buffers, audio preamplifiers, and power rail enable switches requiring stable component supply and consistent parametric performance across production batches.
Supply support for KSC2859OMTF 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, sensing, and connectivity solutions for automotive, industrial, and consumer markets.
The KSC2859OMTF belongs to ON Semiconductor's general-purpose BJT portfolio, designed specifically for cost-sensitive, high-volume discrete switching and amplification tasks in portable and embedded systems.
FAQ
What is the maximum collector current rating for the KSC2859OMTF?
The KSC2859OMTF has a continuous collector current (IC) rating of 500 mA at TA = 25°C. Derating is required above 25°C ambient per the datasheet's thermal resistance curve (RθJA = 450°C/W). This rating supports robust operation in LED drivers and digital output buffers where peak currents remain within this limit.
Is the KSC2859OMTF RoHS compliant and lead-free?
Yes, the KSC2859OMTF is RoHS compliant and lead-free, meeting JEDEC J-STD-020 MSL1 requirements. Its SOT-23 package uses matte tin plating and is qualified for standard reflow profiles without preconditioning. This ensures compatibility with modern lead-free manufacturing processes and environmental compliance mandates.
What is the typical VCE(sat) of the KSC2859OMTF under switching conditions?
The KSC2859OMTF specifies VCE(sat) ≤ 0.1 V at IC = 50 mA and IB = 5 mA. At lower currents (e.g., IC = 10 mA), VCE(sat) typically falls to 0.05–0.07 V. This low saturation voltage minimizes power loss and heat generation in the KSC2859OMTF during sustained on-state operation.
Can the KSC2859OMTF be used in linear amplifier configurations?
Yes, the KSC2859OMTF can operate in linear mode - its fT of 200 MHz and hFE stability support small-signal amplification up to ~10 MHz. However, due to its 200 mW power limit and lack of built-in compensation, it is best suited for low-power preamp stages rather than high-fidelity or RF amplification. Designers must ensure proper biasing and thermal management when using the KSC2859OMTF linearly.
What is the pin configuration of the KSC2859OMTF in the SOT-23 package?
The KSC2859OMTF uses standard SOT-23 pinout: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector (viewed from top, marking dot at top-left corner). This matches JEDEC TO-236AB mechanical outline and is identical to industry-standard NPN SOT-23 transistors - ensuring compatibility with existing footprints and pick-and-place tooling for the KSC2859OMTF.
KSC2859OMTF 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):
- 500 mA
- Voltage - Collector Emitter Breakdown (Max):
- 30 V
- Vce Saturation (Max) @ Ib, Ic:
- 250mV @ 10mA, 100mA
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 70 @ 100mA, 1V
- Power - Max:
- 150 mW
- Frequency - Transition:
- 300MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
KSC2859OMTF FAQ
1.How can I place an order for KSC2859OMTF through Aetrix?
Please submit a Request for Quotation (RFQ) for KSC2859OMTF 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 KSC2859OMTF reliable?
The price and inventory of KSC2859OMTF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSC2859OMTF is usually 5 days.
3.What payment methods are accepted for KSC2859OMTF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSC2859OMTF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSC2859OMTF?
KSC2859OMTF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSC2859OMTF 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 KSC2859OMTF?
For technical support, including KSC2859OMTF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSC2859OMTF requirements.
6.How does Aetrix verify that KSC2859OMTF is sourced from the original manufacturer or authorized distributors?
All KSC2859OMTF 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 KSC2859OMTF meets industry standards.
7.What is the process for return or replacement of KSC2859OMTF?
All KSC2859OMTF units undergo pre-shipment inspection (PSI). If there is an issue with KSC2859OMTF, 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 KSC2859OMTF part is unused and in its original packaging.
Return procedure for KSC2859OMTF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
KSC2859OMTF Tags
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MMBT3906LT1G
onsemi
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MMBT3904-7-F
Diodes Incorporated
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MMBT3904LT1G
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MMBT3906-7-F
Diodes Incorporated
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MMBT3904-TP
Micro Commercial Co
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MMBT2222A-7-F
Diodes Incorporated
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BC846BLT1G
onsemi
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BC847B,215
Nexperia USA Inc.
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SMMBT3904LT1G
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MMBT2222A-TP
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MMBTA06LT1G
onsemi
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MMBT2222ALT1G
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