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

onsemi 2SC3746R

Name: 2SC3746R
Brand: onsemi
SKU: 2SC3746R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SC3746R

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3 Full Pack

Datasheet:: 2SC3746R.pdf

Description:: TRANS NPN 60V 5A TO-220ML

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2SC3746R from SANYO Semiconductor is an NPN epitaxial planar silicon transistor designed for high-speed switching in power amplifiers, inverters, and lamp drivers. It delivers 5 A continuous collector current, 60 V collector-emitter breakdown voltage, and 0.4 V saturation voltage at 2.5 A/0.125 A drive-enabling efficient operation in automotive stereo power stages and fluorescent lighting circuits.

For engineers reviewing the 2SC3746R datasheet, pinout, applications, or equivalent options, key selection criteria include its 100 MHz gain-bandwidth product, low 0.1 µs turn-on time, TO-220ML micaless package thermal performance, and hFE rank R (100–200) for predictable DC gain control in linear and switching designs.

Technical Context

The 2SC3746R operates as a high-current, medium-voltage NPN switching transistor with optimized charge storage and minority-carrier lifetime control. Its 0.5 µs storage time and 0.1 µs fall time support stable operation in pulse-width modulated (PWM) converters and motor controller half-bridges up to ~100 kHz.

Designed for direct mounting without mica insulation, the device uses a TO-220ML package with electrically isolated collector tab. Its hFE classification (Rank R: 100–200 at V_CE = 2 V, I_C = 1 A) ensures consistent base drive requirements across production lots in high-volume lamp ballast and audio output stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	60 V - Supports operation in 48 V industrial bus and 12 V automotive systems with margin against transients.
I_C (continuous)	5 A - Enables single-transistor output stage for 50–100 W audio amplifiers or lamp driver primary switches.
V_CE(sat)	–0.4 V at I_C = 2.5 A, I_B = 0.125 A - Reduces conduction loss to <1 W per device in Class AB or switching mode.
f_T	100 MHz - Ensures adequate small-signal gain at switching frequencies up to 10–20 kHz with stable phase margin.
t_on/t_f	0.1 µs / 0.1 µs - Limits overlap loss in complementary switch pairs and supports clean square-wave generation.
P_C @ T_c = 25°C	20 W - Allows heatsink-free operation up to ~2 W dissipation; full rating requires case temperature control.
hFE Rank	R (100–200) - Provides known base current range (12.5–25 mA at I_C = 2.5 A) for fixed-bias or emitter-follower drive design.

Pinout & Package

2SC3746R uses the TO-220ML package: a thermally enhanced variant of TO-220 with electrically isolated collector tab and micaless construction for simplified mechanical mounting and improved thermal interface reliability.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Control input	Receives current-limited drive signal; requires ≥12.5 mA for full saturation at 2.5 A load.
2 (Collector)	High-current output node	Electrically isolated metal tab; connects directly to heatsink while maintaining circuit ground separation.
3 (Emitter)	Current return path	Serves as common reference for base drive and load return; low-inductance layout critical for switching stability.

Key Features

Feature	Design Value
Low V_CE(sat)	–0.4 V enables <1 W conduction loss at 2.5 A, reducing heatsink size in space-constrained lamp drivers.
Short switching times	0.1 µs t_on/t_f minimizes overlap loss in PWM inverters operating up to 100 kHz fundamental frequency.
Micaless TO-220ML	Eliminates insulating washer assembly step and thermal interface variability in high-volume manufacturing.
hFE classification (Rank R)	Guaranteed 100–200 gain band allows deterministic base resistor selection without binning or trim.

Applications

Fluorescent Lamp Inverter	Car Audio Power Amplifier
Use Scenario: High-frequency AC generation for rapid-start fluorescent tubes in commercial lighting fixtures. IC Role / Device Role / Timing Role: NPN switch in push-pull resonant inverter stage, driven by complementary 2SA1469 PNP. Use Value: 0.4 V V_CE(sat) and 0.1 µs t_f reduce switching losses and enable >30 kHz operation without excessive heating.	Use Scenario: Output stage in 40–60 W Class AB car stereo amplifier modules. IC Role / Device Role / Timing Role: High-current emitter-follower driver delivering peak currents >3 A into 4 Ω loads. Use Value: Stable hFE (100–200) ensures consistent bias point across temperature, minimizing crossover distortion.
DC-DC Converter Switch	Motor Controller Half-Bridge
Use Scenario: Primary-side switch in 24 V input, 5 A output isolated flyback converter for industrial sensors. IC Role / Device Role / Timing Role: Main power switch controlling energy transfer during ON-time; paired with fast recovery diode. Use Value: 100 MHz f_T maintains gain margin at 100 kHz switching, supporting stable current-mode control loop response.	Use Scenario: Low-side switch in brushed DC motor H-bridge for HVAC actuators and power seats. IC Role / Device Role / Timing Role: Ground-referenced switching element handling bidirectional 4 A stall current pulses. Use Value: TO-220ML's isolated collector allows direct heatsinking to chassis ground without isolation pads or thermal grease degradation risk.

Fluorescent Lamp Inverter

Car Audio Power Amplifier

Use Scenario: High-frequency AC generation for rapid-start fluorescent tubes in commercial lighting fixtures.

IC Role / Device Role / Timing Role: NPN switch in push-pull resonant inverter stage, driven by complementary 2SA1469 PNP.

Use Value: 0.4 V V_CE(sat) and 0.1 µs t_f reduce switching losses and enable >30 kHz operation without excessive heating.

Use Scenario: Output stage in 40–60 W Class AB car stereo amplifier modules.

IC Role / Device Role / Timing Role: High-current emitter-follower driver delivering peak currents >3 A into 4 Ω loads.

Use Value: Stable hFE (100–200) ensures consistent bias point across temperature, minimizing crossover distortion.

DC-DC Converter Switch

Motor Controller Half-Bridge

Use Scenario: Primary-side switch in 24 V input, 5 A output isolated flyback converter for industrial sensors.

IC Role / Device Role / Timing Role: Main power switch controlling energy transfer during ON-time; paired with fast recovery diode.

Use Value: 100 MHz f_T maintains gain margin at 100 kHz switching, supporting stable current-mode control loop response.

Use Scenario: Low-side switch in brushed DC motor H-bridge for HVAC actuators and power seats.

IC Role / Device Role / Timing Role: Ground-referenced switching element handling bidirectional 4 A stall current pulses.

Use Value: TO-220ML's isolated collector allows direct heatsinking to chassis ground without isolation pads or thermal grease degradation risk.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed switching transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SC3746	No suffix - same electrical specs and TO-220ML package; R-grade hFE bin not explicitly marked on part body.	Identical use in lamp inverters and audio amps; no functional difference in circuit design or layout.	Select 2SC3746R when hFE bin traceability and documented R-rank (100–200) are required for production consistency.
MJD127G	Higher V_CEO (80 V), lower f_T (30 MHz), TO-220AB package with non-isolated collector tab.	Preferred in higher-bus-voltage industrial converters; unsuitable where collector isolation or fast switching is mandatory.	Choose MJD127G only if 80 V rating is needed and thermal mounting permits insulated hardware; verify layout compatibility.

Compared with 2SC3746 and MJD127G, the 2SC3746R offers guaranteed hFE binning and collector-isolated packaging-critical for repeatable thermal management and gain-controlled biasing in high-volume lighting and automotive audio production.

Availability

2SC3746R is available at Aetrix Electronics and suitable for fluorescent lamp inverters, car audio power amplifiers, and DC-DC converter switches requiring stable component supply and consistent hFE binning.

Supply support for 2SC3746R 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

SANYO Semiconductor was a Japanese semiconductor manufacturer specializing in analog, power, and discrete devices before its acquisition by ON Semiconductor in 2013.

The 2SC3746R belongs to SANYO's high-speed bipolar transistor family targeting cost-sensitive, thermally demanding applications such as lamp ballasts and automotive audio-designed for manufacturability via micaless packaging and tight hFE grading.

FAQ

What is the maximum continuous collector current rating for the 2SC3746R?

The 2SC3746R has a maximum continuous collector current (I_C) rating of 5 A at T_c = 25°C. Derating is required above this case temperature; at T_c = 100°C, the usable I_C drops to approximately 2.5 A. This rating assumes proper heatsinking and is validated under DC or low-duty-cycle pulsed conditions per the original SANYO datasheet No. 1973.

Does the 2SC3746R have an electrically isolated collector tab?

Yes, the 2SC3746R uses the TO-220ML package, which features an electrically isolated collector tab. Unlike standard TO-220AB, this allows direct mechanical mounting to a grounded heatsink without requiring insulating washers or thermal pads-reducing thermal resistance and assembly complexity in high-volume lamp driver and amplifier production.

What does the 'R' suffix in 2SC3746R signify?

The 'R' suffix in 2SC3746R denotes hFE Rank R, specifying a DC current gain range of 100–200 measured at V_CE = 2 V and I_C = 1 A. This binning enables predictable base drive design and eliminates post-manufacturing gain sorting-critical for consistent performance in audio output stages and lamp inverter feedback loops where gain variation affects regulation accuracy.

Can the 2SC3746R be used as a direct replacement for the 2SC3746 without circuit changes?

Yes, the 2SC3746R is functionally and pinout-identical to the 2SC3746, sharing identical absolute maximum ratings, electrical characteristics, and TO-220ML packaging. The only distinction is the guaranteed hFE Rank R marking; no schematic, layout, or thermal design modifications are needed when substituting 2SC3746R for 2SC3746 in existing designs.

What is the typical gain-bandwidth product (f_T) of the 2SC3746R?

The 2SC3746R has a typical gain-bandwidth product (f_T) of 100 MHz, measured at V_CE = 5 V and I_C = 1 A. This value supports stable small-signal amplification and switching control up to ~10–20 kHz in power applications, ensuring sufficient open-loop gain for current-sense feedback and gate-drive buffering in converter topologies using the 2SC3746R.

2SC3746R Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-220-3 Full Pack

Packaging:: Bulk

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 5 A

Voltage - Collector Emitter Breakdown (Max):: 60 V

Vce Saturation (Max) @ Ib, Ic:: 400mV @ 125mA, 2.5A

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 1A, 2V

Power - Max:: 2 W

Frequency - Transition:: 100MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220ML

2SC3746R FAQ

1.How can I place an order for 2SC3746R through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SC3746R 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 2SC3746R reliable?

The price and inventory of 2SC3746R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SC3746R is usually 5 days.

3.What payment methods are accepted for 2SC3746R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SC3746R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SC3746R?

2SC3746R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SC3746R 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 2SC3746R?

For technical support, including 2SC3746R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SC3746R requirements.

6.How does Aetrix verify that 2SC3746R is sourced from the original manufacturer or authorized distributors?

All 2SC3746R 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 2SC3746R meets industry standards.

7.What is the process for return or replacement of 2SC3746R?

All 2SC3746R units undergo pre-shipment inspection (PSI). If there is an issue with 2SC3746R, 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 2SC3746R part is unused and in its original packaging.

Return procedure for 2SC3746R:

1.Submit a request within 90 days.

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

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