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

onsemi 2SC4105M

Name: 2SC4105M
Brand: onsemi
SKU: 2SC4105M
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SC4105M

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: 2SC4105M.pdf

Description:: TRANS NPN 400V 4A TO-220AB

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2SC4105M from SANYO is an NPN triple diffused planar silicon transistor designed for high-voltage switching regulator applications, featuring 400 V V_CEO, 4 A I_C, 1.57 W P_C at T_c = 25 °C, and a minimum DC current gain (h_FE1) of 100 at I_C = 0.4 A, V_CE = 5 V. It delivers high-speed switching with t_on = 0.5 µs, t_off = 2.5 µs, and t_f = 0.3 µs under specified test conditions.

For engineers reviewing the 2SC4105M datasheet, pinout, applications, or equivalent options, this device is selected for off-line SMPS primary-side switching, flyback converter power stages, and industrial DC-DC regulators requiring robust avalanche safe operating area (ASO) and MBIT process reliability.

Technical Context

This transistor operates as a high-voltage, medium-current NPN switch in hard-switched topologies. Its rated V_CEO = 400 V and V_CBO = 500 V support operation across universal AC input ranges without derating, while its wide forward-bias ASO enables reliable handling of inductive turn-off transients up to 200 V with I_C = 4 A.

The device uses SANYO's MBIT (Metal Bonding Integrated Technology) process for enhanced thermal stability and switching consistency. Electrical characteristics are specified at T_a = 25 °C and T_c = 25 °C, with pulse testing (P_W ≤ 300 µs, duty cycle ≤ 10%) used for peak ratings including I_CP = 8 A and P_C = 40 W.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	400 V - Supports 230 VAC-derived bus voltages with ≥2× safety margin in flyback and forward converters.
I_C	4 A continuous - Rated collector current enabling 100–200 W power stage designs in TO-220AB package.
P_C (T_c = 25 °C)	1.57 W - Thermal limit at case temperature; actual usable dissipation depends on heatsink design and ambient conditions.
h_FE1 (min)	100 @ I_C = 0.4 A, V_CE = 5 V - Ensures stable base drive requirements for linear or quasi-resonant control schemes.
t_on/t_off/t_f	0.5 / 2.5 / 0.3 µs - Fast switching enables operation up to ~100 kHz with low transition losses in hard-switched topologies.
V_CE(sat)	0.8 V @ I_C = 4 A, I_B = 0.8 A - Low saturation voltage reduces conduction loss in high-duty-cycle applications.
f_T	20 MHz @ V_CE = 10 V, I_C = 0.4 A - Sufficient gain-bandwidth for stable feedback loop compensation in current-mode controllers.

Pinout & Package

SANYO TO-220AB package: insulated tab, vertical mounting, 3-pin through-hole configuration with metal tab electrically connected to collector.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Control electrode	Receives current-limited drive signal; requires external base resistor to set I_B for desired I_C and saturation.
2 (Collector)	High-voltage output node	Connected to primary winding and bus rail; tab is collector-requires isolation when mounted to heatsink.
3 (Emitter)	Current return path	Common reference for base drive and current sensing; tied to source of control IC or shunt resistor.

Key Features

Feature	Design Value
High breakdown voltage	V_CBO = 500 V ensures margin against voltage spikes in unclamped inductive switching.
Wide forward-bias ASO	Supports simultaneous 200 V V_CE and 4 A I_C in single-pulse operation-critical for ruggedness in flyback reset.
MBIT process technology	Improves thermal resistance uniformity and reduces parameter drift over temperature and lifetime.
High-speed switching	Sub-microsecond t_on and t_f minimize overlap loss, enabling efficient operation at 50–100 kHz.

Applications

Switch-Mode Power Supply	Flyback Converter Primary Switch
Use Scenario: Off-line AC/DC adapter for industrial instrumentation with universal input (85–265 VAC). IC Role / Device Role / Timing Role: Main power switch controlling energy transfer from primary to secondary via transformer. Use Value: 400 V V_CEO and wide ASO allow direct use without snubber in 100 W designs, reducing BOM count and layout complexity.	Use Scenario: Isolated DC-DC module for telecom shelf power with 48 V input and ±12 V outputs. IC Role / Device Role / Timing Role: Primary-side NPN switch in discontinuous conduction mode (DCM) flyback topology. Use Value: Fast t_f = 0.3 µs minimizes dead-time loss, improving light-load efficiency and enabling tighter regulation.
DC-DC Boost Regulator	Industrial Motor Drive Pre-regulator
Use Scenario: 24 V input to 400 V bus boost stage for brushless DC motor inverter. IC Role / Device Role / Timing Role: High-side switching element in non-synchronous boost configuration. Use Value: V_CEO = 400 V matches target bus voltage, eliminating need for series-connected devices or higher-cost alternatives.	Use Scenario: Input pre-regulator for 3-phase inverter feeding 400 V AC induction motor. IC Role / Device Role / Timing Role: Hard-switched chopper regulating DC link voltage prior to inverter stage. Use Value: 1.57 W P_C rating at T_c = 25 °C supports continuous 5 A peak current with standard TO-220 heatsinking.

Switch-Mode Power Supply

Flyback Converter Primary Switch

Use Scenario: Off-line AC/DC adapter for industrial instrumentation with universal input (85–265 VAC).

IC Role / Device Role / Timing Role: Main power switch controlling energy transfer from primary to secondary via transformer.

Use Value: 400 V V_CEO and wide ASO allow direct use without snubber in 100 W designs, reducing BOM count and layout complexity.

Use Scenario: Isolated DC-DC module for telecom shelf power with 48 V input and ±12 V outputs.

IC Role / Device Role / Timing Role: Primary-side NPN switch in discontinuous conduction mode (DCM) flyback topology.

Use Value: Fast t_f = 0.3 µs minimizes dead-time loss, improving light-load efficiency and enabling tighter regulation.

DC-DC Boost Regulator

Industrial Motor Drive Pre-regulator

Use Scenario: 24 V input to 400 V bus boost stage for brushless DC motor inverter.

IC Role / Device Role / Timing Role: High-side switching element in non-synchronous boost configuration.

Use Value: V_CEO = 400 V matches target bus voltage, eliminating need for series-connected devices or higher-cost alternatives.

Use Scenario: Input pre-regulator for 3-phase inverter feeding 400 V AC induction motor.

IC Role / Device Role / Timing Role: Hard-switched chopper regulating DC link voltage prior to inverter stage.

Use Value: 1.57 W P_C rating at T_c = 25 °C supports continuous 5 A peak current with standard TO-220 heatsinking.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SC4027	V_CEO = 400 V, I_C = 3 A, P_C = 1.25 W, h_FE min = 80 - lower current and power rating.	Lower I_C limits usable power to ≤75 W; reduced ASO margin in high-energy flyback designs.	Select when cost sensitivity outweighs power density needs and peak current stays below 3 A.
BU508A	V_CEO = 1500 V, I_C = 8 A, P_C = 125 W, TO-3 package - significantly higher voltage/current but larger footprint and slower switching.	Over-specified for 400 V applications; introduces unnecessary gate drive complexity and layout area.	Choose only if future-proofing for >600 V systems or legacy TO-3 board compatibility is required.

Compared with 2SC4105M, 2SC4027 offers lower cost but reduced power handling, while BU508A provides extreme voltage headroom at the expense of size, speed, and drive simplicity-making 2SC4105M the optimal balance for 100–200 W, 400 V-class SMPS.

Availability

2SC4105M is available at Aetrix Electronics and suitable for switching regulator, flyback converter, and industrial DC-DC pre-regulator applications requiring stable component supply, long-term lifecycle continuity, and traceable sourcing from original manufacturer channels.

Supply support for 2SC4105M 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 Electric Co., Ltd. was a Japanese semiconductor manufacturer known for high-reliability discrete devices and analog ICs before its acquisition by Panasonic in 2012; its transistor product lines remain widely deployed in industrial power systems.

The 2SC4105M belongs to SANYO's high-voltage NPN switching transistor family developed specifically for off-line SMPS and industrial power conversion, emphasizing ruggedness, consistent gain, and thermal stability under pulsed load conditions.

FAQ

What is the maximum junction temperature rating for the 2SC4105M?

The 2SC4105M has a maximum junction temperature (T_j) rating of 150 °C. This value defines the upper thermal limit for reliable operation; exceeding it-even momentarily-may cause permanent degradation. Derating curves in the datasheet show allowable collector dissipation versus case temperature, and proper heatsinking must ensure T_j remains within specification under worst-case ambient and load conditions.

Is the 2SC4105M pin-compatible with other TO-220AB NPN transistors like the 2SC3320?

No, the 2SC4105M is not guaranteed pin-compatible with 2SC3320 or other TO-220AB transistors. While both use the same mechanical outline, pin assignments differ: 2SC4105M is Base–Collector–Emitter (1–2–3), whereas 2SC3320 uses Emitter–Base–Collector. Substituting without verifying pinout risks circuit damage. Always consult the specific device's datasheet before replacement.

Does the 2SC4105M support avalanche energy rating (E_AS) specifications?

The 2SC4105M datasheet does not specify a rated avalanche energy (E_AS) value. Instead, it defines a wide forward-bias safe operating area (ASO) and reverse-bias ASO, verified under pulsed conditions (e.g., 1 ms, 10 ms). Designers must rely on these ASO boundaries-not E_AS-to validate ruggedness during inductive switching events.

What is the typical V_BE(sat) of the 2SC4105M at full rated current?

The typical V_BE(sat) of the 2SC4105M is 1.0 V at I_C = 4 A and I_B = 0.8 A, as shown in Figure ITR06299. This value increases slightly at elevated temperatures (e.g., +120 °C), reaching ~1.15 V. Accurate base drive design must account for this to maintain saturation and avoid second breakdown.

Can the 2SC4105M be used in linear amplifier applications?

The 2SC4105M is not optimized for linear amplification. Its datasheet specifies parameters exclusively for switching operation-including ASO, switching times, and pulsed ratings-and lacks linearity metrics (e.g., distortion, f_T flatness, or SOA in linear mode). Using it in Class-A or AB amplifiers risks thermal runaway and premature failure due to insufficient safe operating area under DC bias.

2SC4105M Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-220-3

Packaging:: Bulk

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 4 A

Voltage - Collector Emitter Breakdown (Max):: 400 V

Vce Saturation (Max) @ Ib, Ic:: 800mV @ 400mA, 2A

Current - Collector Cutoff (Max):: 10µA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 20 @ 400mA, 5V

Power - Max:: 1.75 W

Frequency - Transition:: 20MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220AB

2SC4105M FAQ

1.How can I place an order for 2SC4105M through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SC4105M 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 2SC4105M reliable?

The price and inventory of 2SC4105M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SC4105M is usually 5 days.

3.What payment methods are accepted for 2SC4105M?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SC4105M transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SC4105M?

2SC4105M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SC4105M 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 2SC4105M?

For technical support, including 2SC4105M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SC4105M requirements.

6.How does Aetrix verify that 2SC4105M is sourced from the original manufacturer or authorized distributors?

All 2SC4105M 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 2SC4105M meets industry standards.

7.What is the process for return or replacement of 2SC4105M?

All 2SC4105M units undergo pre-shipment inspection (PSI). If there is an issue with 2SC4105M, 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 2SC4105M part is unused and in its original packaging.

Return procedure for 2SC4105M:

1.Submit a request within 90 days.

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

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