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

onsemi 2SC6043

Name: 2SC6043
Brand: onsemi
SKU: 2SC6043
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SC6043

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 Long Body

Datasheet:: 2SC6043.pdf

Description:: TRANS NPN 50V 2A 3-MP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2SC6043 from onsemi is an NPN bipolar junction transistor (BJT) designed for medium-power switching applications, featuring V_CEO = 50 V, I_C = 2 A continuous, V_CE(sat) = 150–300 mV at I_C = 1 A / I_B = 50 mA, f_T = 420 MHz, and h_FE = 200–560 at 100 mA. It serves as a low-saturation switch in voltage regulators, relay drivers, and lamp drivers.

For engineers reviewing the 2SC6043 datasheet, pinout, applications, or equivalent options, key selection criteria include its MBIT process-derived low V_CE(sat), high-speed switching (t_on = 35 ns, t_f = 40 ns), TO-92-compatible MP package, and verified operation up to 150°C junction temperature.

Technical Context

The 2SC6043 employs onsemi's MBIT (Modified Base Island Technology) process to achieve low saturation voltage and high current gain uniformity. Its structure supports stable DC amplification (h_FE ≥ 200 at 100 mA) and high-frequency switching (f_T = 420 MHz) with minimal storage time (t_stg = 330 ns).

Designed for single-ended, medium-current switching, it operates within V_CBO/V_CES = 80 V limits but is rated for V_CEO = 50 V under standard bias conditions. The device exhibits low output capacitance (C_ob = 9 pF) and tight V_BE(sat) = 0.94–1.2 V, enabling efficient base drive design in discrete power control stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	50 V - Maximum safe collector-emitter voltage with open base; defines upper limit for switching in 24–48 V systems.
I_C (cont.)	2 A - Continuous collector current rating; supports relay coils and LED arrays without heatsinking below ~65°C ambient.
V_CE(sat)	150–300 mV @ I_C=1 A/I_B=50 mA - Low conduction loss enables >98% efficiency in saturated-switch topologies.
f_T	420 MHz - Unity-gain frequency confirms suitability for <100 kHz PWM switching with margin for layout-induced parasitics.
h_FE	200–560 @ V_CE=2 V, I_C=100 mA - High and wide DC gain range simplifies base resistor selection across production lots.
t_on/t_f	35 ns / 40 ns - Fast turn-on and fall times reduce switching losses in repetitive on/off control of inductive loads.

Pinout & Package

Package: MP (JEITA SC-51 / JEDEC TO-92 variant, TO-226AE compliant), epoxy-molded, through-hole, 3-pin, 0.578 g mass.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Current exit node; connected to ground or low-side return path in common-emitter configurations.
2	Collector	Current entry node; tied to load supply rail (e.g., +24 V) and switched load (relay coil, lamp anode).
3	Base	Control input; requires ~50 mA drive for full saturation at 1 A load; sensitive to ESD due to low V_EBO = 6 V.

Key Features

Feature	Design Value
MBIT process technology	Enables consistent h_FE spread and reduced V_CE(sat) variation across temperature and current ranges.
Low V_CE(sat)	150–300 mV ensures <0.3 W conduction loss at 1 A, minimizing thermal stress in compact PCB layouts.
High-speed switching	35 ns t_on, 40 ns t_f, and 330 ns t_stg support clean edge transitions in 50–100 kHz control signals.
Robust thermal rating	150°C max junction temperature allows operation in enclosed industrial enclosures without forced airflow.

Applications

Voltage Regulator Output Stage	Relay Driver Circuit
Use Scenario: Linear pass transistor in adjustable 3–24 V output regulators delivering up to 1.5 A. IC Role / Device Role / Timing Role: NPN series pass element controlled by error amplifier feedback loop. Use Value: Low V_CE(sat) minimizes dropout voltage and heat generation under full load.	Use Scenario: Driving 12 V/24 V electromagnetic relays with coil resistance 60–200 Ω in PLC I/O modules. IC Role / Device Role / Timing Role: Saturated switch providing galvanic isolation between microcontroller GPIO and relay coil. Use Value: Fast t_on/t_f prevents contact chatter during rapid on/off cycling; h_FE ≥ 200 ensures reliable drive with ≤10 kΩ base resistor.
Lamp Driver for Industrial Indicators	Electrical Equipment Control Logic
Use Scenario: Switching incandescent or halogen pilot lamps (5–25 W) in panel-mounted test equipment. IC Role / Device Role / Timing Role: Medium-current load switch interfacing logic-level control to AC/DC lamp supply rails. Use Value: 2 A I_C rating accommodates cold-filament inrush; TO-92-compatible MP package fits dense front-panel layouts.	Use Scenario: Discrete logic-level translation and load enable in legacy industrial controllers using TTL/CMOS inputs. IC Role / Device Role / Timing Role: Level-shifting buffer and current amplifier for driving solenoids, buzzers, or status LEDs. Use Value: Wide h_FE range (200–560) maintains drive margin across manufacturing tolerances and aging effects.

Voltage Regulator Output Stage

Relay Driver Circuit

Use Scenario: Linear pass transistor in adjustable 3–24 V output regulators delivering up to 1.5 A.

IC Role / Device Role / Timing Role: NPN series pass element controlled by error amplifier feedback loop.

Use Value: Low V_CE(sat) minimizes dropout voltage and heat generation under full load.

Use Scenario: Driving 12 V/24 V electromagnetic relays with coil resistance 60–200 Ω in PLC I/O modules.

IC Role / Device Role / Timing Role: Saturated switch providing galvanic isolation between microcontroller GPIO and relay coil.

Use Value: Fast t_on/t_f prevents contact chatter during rapid on/off cycling; h_FE ≥ 200 ensures reliable drive with ≤10 kΩ base resistor.

Lamp Driver for Industrial Indicators

Electrical Equipment Control Logic

Use Scenario: Switching incandescent or halogen pilot lamps (5–25 W) in panel-mounted test equipment.

IC Role / Device Role / Timing Role: Medium-current load switch interfacing logic-level control to AC/DC lamp supply rails.

Use Value: 2 A I_C rating accommodates cold-filament inrush; TO-92-compatible MP package fits dense front-panel layouts.

Use Scenario: Discrete logic-level translation and load enable in legacy industrial controllers using TTL/CMOS inputs.

IC Role / Device Role / Timing Role: Level-shifting buffer and current amplifier for driving solenoids, buzzers, or status LEDs.

Use Value: Wide h_FE range (200–560) maintains drive margin across manufacturing tolerances and aging effects.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN medium-power switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SC4171	V_CEO = 50 V, I_C = 1.5 A, V_CE(sat) = 200–400 mV, f_T = 250 MHz	Lower current rating and slower switching; suitable only for ≤1 A loads with relaxed speed requirements.	Choose when lower cost and legacy stock availability outweigh need for 2 A rating or 420 MHz f_T.
MJD2955	V_CEO = 60 V, I_C = 12 A, V_CE(sat) = 1.8 V @ 8 A, TO-220 package	Higher power, higher V_CE(sat), larger footprint; requires heatsink for >1 A continuous use.	Choose for higher-current relay/lamp loads where board space permits TO-220 mounting and thermal management.

Compared with 2SC4171 and MJD2955, the 2SC6043 uniquely balances 2 A capability, sub-300 mV saturation, 420 MHz bandwidth, and TO-92-compatible MP packaging-making it optimal for space-constrained, medium-speed, medium-current discrete switching where thermal budget is limited.

Availability

2SC6043 is available at Aetrix Electronics and suitable for voltage regulators, relay drivers, and lamp drivers requiring stable component supply in industrial control, test equipment, and electrical infrastructure applications.

Supply support for 2SC6043 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient innovation for automotive, industrial, cloud, and IoT applications.

The 2SC6043 belongs to onsemi's general-purpose bipolar transistor product line, engineered specifically for reliable, low-loss discrete switching in cost-sensitive industrial and equipment control systems.

FAQ

What is the maximum continuous collector current rating for the 2SC6043?

The 2SC6043 has a maximum continuous collector current (I_C) rating of 2 A at T_a = 25°C. Derating applies above 25°C ambient; at 75°C, the usable I_C drops to approximately 1.3 A per the thermal resistance curve in the official datasheet. This rating assumes adequate PCB copper area for heat dissipation and excludes pulse conditions.

Does the 2SC6043 support high-frequency switching applications?

Yes, the 2SC6043 supports high-frequency switching with a gain-bandwidth product (f_T) of 420 MHz and measured switching times of t_on = 35 ns, t_stg = 330 ns, and t_f = 40 ns. These values confirm suitability for PWM control up to 100 kHz in well-designed layouts, though practical performance depends on base drive strength and load inductance.

What package type is used for the 2SC6043, and is it compatible with standard TO-92 footprints?

The 2SC6043 uses the MP package, which conforms to JEITA SC-51 and JEDEC TO-226AE standards-functionally identical to TO-92 (1-watt) in pin assignment (E-C-B) and mechanical outline. Its dimensions (8.5 × 4.7 × 5.0 mm) and lead spacing match standard TO-92 sockets and footprints, enabling drop-in replacement in legacy designs.

What is the typical V_CE(sat) of the 2SC6043 under standard test conditions?

The typical V_CE(sat) of the 2SC6043 is 225 mV at I_C = 1 A and I_B = 50 mA, with a guaranteed maximum of 300 mV under those same conditions. This low saturation voltage directly reduces conduction loss and self-heating, especially critical in thermally constrained linear regulator or lamp driver implementations using the 2SC6043.

Can the 2SC6043 be used in relay driver circuits with inductive kickback protection?

Yes, the 2SC6043 is commonly used in relay driver circuits and should always be paired with a flyback diode (e.g., 1N4007) across the relay coil to clamp inductive voltage spikes. Its V_CEO = 50 V and V_CBO = 80 V ratings provide margin against transient overshoot, and its robust 150°C junction rating sustains reliability under repeated switching stress when properly protected.

2SC6043 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-226-3, TO-92-3 Long Body

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 2 A

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

Vce Saturation (Max) @ Ib, Ic:: 300mV @ 50mA, 1A

Current - Collector Cutoff (Max):: 1µA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 200 @ 100mA, 2V

Power - Max:: 1 W

Frequency - Transition:: 420MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 3-MP

2SC6043 FAQ

1.How can I place an order for 2SC6043 through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SC6043 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 2SC6043 reliable?

The price and inventory of 2SC6043 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SC6043 is usually 5 days.

3.What payment methods are accepted for 2SC6043?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SC6043 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SC6043?

2SC6043 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SC6043 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 2SC6043?

For technical support, including 2SC6043 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SC6043 requirements.

6.How does Aetrix verify that 2SC6043 is sourced from the original manufacturer or authorized distributors?

All 2SC6043 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 2SC6043 meets industry standards.

7.What is the process for return or replacement of 2SC6043?

All 2SC6043 units undergo pre-shipment inspection (PSI). If there is an issue with 2SC6043, 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 2SC6043 part is unused and in its original packaging.

Return procedure for 2SC6043:

1.Submit a request within 90 days.

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

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