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

onsemi 2SC4634LS

Name: 2SC4634LS
Brand: onsemi
SKU: 2SC4634LS
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SC4634LS

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3 Full Pack

Datasheet:: 2SC4634LS.pdf

Description:: TRANS NPN 1500V 0.01A TO220FI

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2SC4634LS from SANYO is an NPN triple diffused planar silicon transistor designed for high-voltage amplifier and switching applications, featuring V_CEO = 1500 V, I_C = 10 mA, Cob = 1.5 pF (typ), f_T = 6 MHz, and full-isolation TO-220FI(LS) packaging - used in flyback converters and CRT horizontal deflection circuits.

For engineers reviewing the 2SC4634LS datasheet, pinout, applications, or equivalent options, key selection criteria include high-voltage blocking capability, low output capacitance for fast switching, thermal resistance of 12.5°C/W, and verified operation up to 150°C junction temperature in isolated power stage designs.

Technical Context

This device employs a triple diffused planar structure with HVP (High-Voltage Process) for enhanced reliability and stable breakdown performance. Its full-isolation TO-220FI(LS) package electrically isolates the collector tab from the mounting surface, enabling direct heatsink attachment without insulation washers in high-side switch configurations.

The 2SC4634LS delivers DC current gain (h_FE) of 10–60 at V_CE = 5 V and I_C = 200 µA, with V_CE(sat) ≤ 5 V at I_C = 500 µA / I_B = 100 µA, supporting linear amplification and pulse-switching roles in high-impedance, low-current HV nodes.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	1500 V - supports primary-side switching in offline SMPS up to 1 kV AC input-derived rails
Cob	1.5 pF (typ @ V_CB = 100 V) - minimizes Miller feedback for improved switching speed & stability
f_T	6 MHz - enables usable small-signal amplification up to mid-RF range in HV preamp stages
R_thj-c	12.5 °C/W - allows 2 W dissipation with ≤25°C case-to-ambient rise when mounted on standard heatsink
h_FE	10–60 - provides predictable base drive requirements for gate-driving or feedback-loop transistors
T_j max	150 °C - ensures operational margin in enclosed, convection-cooled HV power supplies

Pinout & Package

Package: TO-220FI(LS) - full-isolation variant of TO-220 with insulated collector tab; 16.1 mm × 14.0 mm × 3.6 mm body; screw-mount compatible.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Control electrode	Receives low-current drive signal; requires current-limiting resistor due to V_BE(sat) = 2 V @ I_C = 500 µA
2 (Collector)	High-voltage output node	Electrically isolated tab - may be directly bolted to heatsink without insulator
3 (Emitter)	Reference/return path	Connected to ground or low-side return; defines common reference for V_CE and V_BE biasing

Key Features

Feature	Design Value
Full-isolation package	TO-220FI(LS) eliminates need for mica washer or silicone pad in heatsink mounting
HVP process technology	Enables consistent 1500 V breakdown across production lots with <1 µA leakage at rated voltage
Low Cob (1.5 pF)	Reduces switching losses and improves stability in high-gain HV amplifier feedback networks
High V_CEO/V_CBO	Rated for continuous 1500 V operation - suitable for 800 V DC bus + 30% surge margin in industrial converters

Applications

Flyback Converter Primary Switch	CRT Horizontal Deflection Output
Use Scenario: High-voltage switching in offline AC/DC power supplies with 600–900 V DC link. IC Role / Device Role / Timing Role: NPN switching transistor operating in hard-switched or quasi-resonant mode. Use Value: 1500 V V_CEO rating accommodates reflected flyback spikes and line surges without clamping.	Use Scenario: Horizontal output stage driving CRT yoke with high-voltage retrace pulses. IC Role / Device Role / Timing Role: Linear-to-switching transition amplifier handling 15–20 kHz sawtooth waveforms. Use Value: Low Cob minimizes phase shift in high-frequency sweep timing; full isolation prevents yoke ground loop noise.
Photocoupler Driver Stage	High-Voltage Signal Amplifier
Use Scenario: Driving optocoupler LED in isolated feedback paths of medical or industrial PSUs. IC Role / Device Role / Timing Role: Current-source driver providing precise 5–10 mA LED current under HV bias. Use Value: Stable h_FE and low I_CBO (<1 µA) ensure accurate current mirroring across temperature.	Use Scenario: Amplifying sensor signals referenced to high-voltage rails (e.g., current sense in HV bus). IC Role / Device Role / Timing Role: Common-emitter preamplifier with emitter degeneration for linearity. Use Value: 6 MHz f_T supports bandwidth up to ~500 kHz with controlled gain; 150°C T_j rating enables board-level integration near heat sources.

Flyback Converter Primary Switch

CRT Horizontal Deflection Output

Use Scenario: High-voltage switching in offline AC/DC power supplies with 600–900 V DC link.

IC Role / Device Role / Timing Role: NPN switching transistor operating in hard-switched or quasi-resonant mode.

Use Value: 1500 V V_CEO rating accommodates reflected flyback spikes and line surges without clamping.

Use Scenario: Horizontal output stage driving CRT yoke with high-voltage retrace pulses.

IC Role / Device Role / Timing Role: Linear-to-switching transition amplifier handling 15–20 kHz sawtooth waveforms.

Use Value: Low Cob minimizes phase shift in high-frequency sweep timing; full isolation prevents yoke ground loop noise.

Photocoupler Driver Stage

High-Voltage Signal Amplifier

Use Scenario: Driving optocoupler LED in isolated feedback paths of medical or industrial PSUs.

IC Role / Device Role / Timing Role: Current-source driver providing precise 5–10 mA LED current under HV bias.

Use Value: Stable h_FE and low I_CBO (<1 µA) ensure accurate current mirroring across temperature.

Use Scenario: Amplifying sensor signals referenced to high-voltage rails (e.g., current sense in HV bus).

IC Role / Device Role / Timing Role: Common-emitter preamplifier with emitter degeneration for linearity.

Use Value: 6 MHz f_T supports bandwidth up to ~500 kHz with controlled gain; 150°C T_j rating enables board-level integration near heat sources.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SC4027	V_CEO = 1200 V, Cob = 2.0 pF, TO-220FI package	Lower voltage rating limits use in >1 kV DC bus designs	Select when 1200 V margin suffices and cost sensitivity outweighs 300 V headroom
2SC4762	V_CEO = 1500 V, I_C = 15 mA, Cob = 1.8 pF, TO-220F	Non-isolated collector tab requires insulation kit; higher I_C supports heavier loads	Choose for higher current drive where thermal design permits added isolation hardware

Compared with 2SC4634LS, the 2SC4027 offers lower cost but reduced voltage margin, while the 2SC4762 trades full isolation for higher current capability - both require layout review for thermal and isolation compliance.

Availability

2SC4634LS is available at Aetrix Electronics and suitable for flyback converters, CRT deflection circuits, photocoupler drivers, and high-voltage signal amplifiers requiring stable component supply and long-term obsolescence management.

Supply support for 2SC4634LS 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 specializing in analog, power, and optoelectronic components before its acquisition by Panasonic in 2011.

The 2SC4634LS belongs to SANYO's high-voltage bipolar transistor product line, engineered specifically for reliable operation in CRT, industrial power, and legacy display equipment where isolation and voltage endurance are critical.

FAQ

What is the maximum collector-emitter voltage rating for the 2SC4634LS?

The 2SC4634LS has a guaranteed minimum collector-to-emitter breakdown voltage V(BR)CEO of 1500 V at I_C = 100 µA with R_BE = ∞. This rating is validated per JEDEC JESD22-A115 and applies under continuous DC conditions at T_a = 25°C. Derating is required above 25°C ambient per the PC–Ta curve in the datasheet.

Does the 2SC4634LS have an electrically isolated collector tab?

Yes, the 2SC4634LS uses the TO-220FI(LS) package, where "FI" denotes full isolation - the collector metal tab is insulated from the internal die mounting surface. This allows direct mechanical attachment to a grounded heatsink without additional insulating hardware, reducing thermal resistance and assembly complexity.

What is the typical output capacitance (Cob) of the 2SC4634LS and at what condition is it measured?

The typical output capacitance Cob of the 2SC4634LS is 1.5 pF, measured at V_CB = 100 V and f = 1 MHz. This low value contributes to reduced Miller effect and faster switching transitions, especially important in high-frequency HV amplifier and switching applications.

Can the 2SC4634LS be used in linear amplifier configurations?

Yes, the 2SC4634LS supports linear operation with h_FE = 10–60 at V_CE = 5 V and I_C = 200 µA, and V_CE(sat) ≤ 5 V at low currents. Its 6 MHz f_T and low Cob enable stable small-signal amplification up to several hundred kHz, provided thermal limits (T_j ≤ 150°C, P_C ≤ 2 W) are observed.

What is the thermal resistance from junction to case (R_thj-c) for the 2SC4634LS?

The junction-to-case thermal resistance R_thj-c of the 2SC4634LS is 12.5°C/W, measured under standard mounting conditions with the TO-220FI(LS) package attached to a flat, clean heatsink surface. This value assumes no thermal interface material unless specified; actual system R_thj-a depends on heatsink size, airflow, and mounting pressure.

2SC4634LS 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):: 10 mA

Voltage - Collector Emitter Breakdown (Max):: 1500 V

Vce Saturation (Max) @ Ib, Ic:: 5V @ 100µA, 500µA

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 10 @ 200µA, 5V

Power - Max:: 2 W

Frequency - Transition:: 6MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220FI(LS)

2SC4634LS FAQ

1.How can I place an order for 2SC4634LS through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SC4634LS 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 2SC4634LS reliable?

The price and inventory of 2SC4634LS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SC4634LS is usually 5 days.

3.What payment methods are accepted for 2SC4634LS?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SC4634LS transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SC4634LS?

2SC4634LS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SC4634LS 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 2SC4634LS?

For technical support, including 2SC4634LS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SC4634LS requirements.

6.How does Aetrix verify that 2SC4634LS is sourced from the original manufacturer or authorized distributors?

All 2SC4634LS 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 2SC4634LS meets industry standards.

7.What is the process for return or replacement of 2SC4634LS?

All 2SC4634LS units undergo pre-shipment inspection (PSI). If there is an issue with 2SC4634LS, 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 2SC4634LS part is unused and in its original packaging.

Return procedure for 2SC4634LS:

1.Submit a request within 90 days.

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

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