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

onsemi 2SC3789E

Name: 2SC3789E
Brand: onsemi
SKU: 2SC3789E
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SC3789E

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-225AA, TO-126-3

Datasheet:: 2SC3789E.pdf

Description:: TRANS NPN 300V 0.1A TO-225-3

Quantity:: RFQ Add To RFQ list

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Inventory:17,700

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Product details

Overview

2SC3789E from onsemi is an NPN epitaxial planar silicon transistor designed for high-voltage video output stages in CRT displays and color TV chroma drivers. It delivers V_CEO ≥ 300 V, f_T = 70 MHz (typ), Cre = 1.8 pF (typ), and supports 100 mA DC collector current with 1.5 W dissipation at T_c = 25°C.

For engineers reviewing the 2SC3789E datasheet, pinout, applications, or equivalent options, key selection criteria include high-voltage breakdown capability, high-frequency response for video signal fidelity, thermal performance under continuous conduction, and TO-126ML package compatibility with legacy mounting infrastructure.

Technical Context

The 2SC3789E operates as a high-voltage, medium-speed switching and linear amplification transistor in video output circuits. Its MBIT process enables stable h_FE (40–320, rank-dependent) and low output capacitance (C_ob = 2.6 pF typ, C_re = 1.8 pF typ) critical for minimizing signal distortion in chroma and deflection drive paths.

It is rated for V_(BR)CEO = –300 V and V_(BR)CBO = –300 V, with V_CE(sat) = –0.6 V at I_C = –20 mA / I_B = –2 mA, and junction temperature up to 150°C - enabling robust operation in thermally demanding CRT horizontal output and chroma amplifier stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	≥ 300 V - supports direct connection to CRT anode supply rails without external snubbing
f_T	70 MHz (typ) - sufficient bandwidth for NTSC/PAL chroma signal amplification up to ~4.43 MHz with margin
C_re	1.8 pF (typ) - minimizes Miller effect distortion in high-gain video driver configurations
h_FE	40–320 (rank E: 100–200) - enables precise biasing stability across production lots for consistent video gain
P_C	1.5 W at T_c = 25°C - compatible with plastic-covered heat sink mounting for high-density PCB layouts
V_CE(sat)	–0.6 V @ I_C = –20 mA - reduces power loss and self-heating during saturated switching in pulse-driven outputs

Pinout & Package

2SC3789E uses the SANYO TO-126ML plastic package (JEDEC TO-126 compatible), featuring a plastic-covered heat sink for direct PCB mounting without insulator. Dimensions conform to standard TO-126 footprint, enabling drop-in replacement in legacy designs.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Connected to ground or low-impedance return path in common-emitter video output stage
2 (Collector)	High-voltage output node	Drives CRT grid/anode load or chroma filter network; rated for –300 V standoff
3 (Base)	Control input	Receives drive signal from preceding stage; low V_BE(sat) (–1.0 V) ensures efficient turn-on with modest base current

Key Features

Feature	Design Value
High breakdown voltage	V_CEO ≥ 300 V enables direct interface with CRT high-voltage supplies without series resistors or clamps
Low reverse transfer capacitance	C_re = 1.8 pF minimizes feedback-induced oscillation and phase shift in wideband video amplifiers
MBIT process technology	Ensures tight h_FE distribution (rank E: 100–200) and stable f_T across temperature for repeatable video gain
TO-126ML mechanical compatibility	Directly interchangeable with TO-126 footprints - no PCB redesign required for legacy CRT board upgrades

Applications

Color TV Chroma Output Stage	High-Definition CRT Display Driver
Use Scenario: Amplifying 3.58 MHz (NTSC) or 4.43 MHz (PAL) chrominance signals before feeding to CRT yoke or comb filter. IC Role / Device Role: Linear NPN video driver operating in Class-A or AB mode with fixed emitter degeneration. Use Value: High V_CEO prevents breakdown during sync tip excursions; low C_re preserves chroma phase accuracy and color purity.	Use Scenario: Driving horizontal deflection yoke or focus/grid modulation circuits in HD CRT monitors (e.g., 1024×768). IC Role / Device Role: High-voltage switch/amplifier handling pulsed 15.734 kHz (NTSC) or 15.625 kHz (PAL) waveforms. Use Value: 300 V rating accommodates flyback-induced voltage spikes; 1.5 W dissipation supports sustained duty-cycle operation.
Video Signal Distribution Amplifier	Legacy Broadcast Equipment Output Stage
Use Scenario: Buffering and distributing composite video signals across multiple downstream loads (e.g., monitor feeds, recording paths). IC Role / Device Role: Unity-gain emitter-follower or low-gain common-emitter buffer with high output current drive. Use Value: Low V_CE(sat) (–0.6 V) maintains signal headroom; h_FE consistency ensures matched channel gain across multi-output boards.	Use Scenario: Final-stage video output in analog broadcast test equipment (e.g., waveform monitors, vectorscopes). IC Role / Device Role: Precision DC-coupled amplifier delivering calibrated video levels into 75 Ω loads. Use Value: Tight h_FE binning (Rank E) and low I_CBO (≤ 0.1 µA) ensure long-term DC offset stability and minimal thermal drift.

Color TV Chroma Output Stage

High-Definition CRT Display Driver

Use Scenario: Amplifying 3.58 MHz (NTSC) or 4.43 MHz (PAL) chrominance signals before feeding to CRT yoke or comb filter.

IC Role / Device Role: Linear NPN video driver operating in Class-A or AB mode with fixed emitter degeneration.

Use Value: High V_CEO prevents breakdown during sync tip excursions; low C_re preserves chroma phase accuracy and color purity.

Use Scenario: Driving horizontal deflection yoke or focus/grid modulation circuits in HD CRT monitors (e.g., 1024×768).

IC Role / Device Role: High-voltage switch/amplifier handling pulsed 15.734 kHz (NTSC) or 15.625 kHz (PAL) waveforms.

Use Value: 300 V rating accommodates flyback-induced voltage spikes; 1.5 W dissipation supports sustained duty-cycle operation.

Video Signal Distribution Amplifier

Legacy Broadcast Equipment Output Stage

Use Scenario: Buffering and distributing composite video signals across multiple downstream loads (e.g., monitor feeds, recording paths).

IC Role / Device Role: Unity-gain emitter-follower or low-gain common-emitter buffer with high output current drive.

Use Value: Low V_CE(sat) (–0.6 V) maintains signal headroom; h_FE consistency ensures matched channel gain across multi-output boards.

Use Scenario: Final-stage video output in analog broadcast test equipment (e.g., waveform monitors, vectorscopes).

IC Role / Device Role: Precision DC-coupled amplifier delivering calibrated video levels into 75 Ω loads.

Use Value: Tight h_FE binning (Rank E) and low I_CBO (≤ 0.1 µA) ensure long-term DC offset stability and minimal thermal drift.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SC3854	V_CEO = 300 V, f_T = 60 MHz (typ), C_re = 2.5 pF - lower bandwidth and higher capacitance than 2SC3789E	Suitable for lower-frequency video applications (< 3 MHz); less ideal for HD chroma fidelity	Prefer 2SC3789E when >5 MHz signal integrity or tighter phase linearity is required
BU2508AX	V_CEO = 1500 V, f_T = 4 MHz - much higher voltage rating but significantly lower bandwidth	Targeted at horizontal output switching (not linear video amplification); unsuitable for chroma linearity	Select 2SC3789E for linear video gain stages; BU2508AX only where extreme V_CEO dominates over frequency response

Compared with 2SC3789E, 2SC3854 trades bandwidth for cost in legacy SD video systems, while BU2508AX serves high-voltage switching-not linear amplification-making 2SC3789E uniquely balanced for CRT chroma and HD display driver roles.

Availability

2SC3789E is available at Aetrix Electronics and suitable for high-definition CRT display, color TV chroma output, and analog broadcast equipment requiring stable component supply and long-lifecycle support.

Supply support for 2SC3789E 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 intelligent edge applications.

The 2SC3789E belongs to onsemi's legacy high-voltage bipolar transistor product line, engineered specifically for analog video signal integrity, CRT deflection reliability, and thermal resilience in consumer and broadcast display systems.

FAQ

What is the maximum collector-emitter voltage rating for the 2SC3789E?

The 2SC3789E has a guaranteed minimum collector-to-emitter breakdown voltage V_(BR)CEO of –300 V at I_C = –1 mA with R_BE = ∞. This rating is validated per JEDEC JESD22-A115 and applies under DC conditions at T_a = 25°C. The 2SC3789E must not be operated beyond this limit without external clamping or derating for temperature and pulse duration.

Is the 2SC3789E pin-compatible with standard TO-126 packages?

Yes, the 2SC3789E uses the SANYO TO-126ML package, which conforms to conventional TO-126 mechanical dimensions and pinout (Emitter–Collector–Base, pins 1–2–3). It requires no insulator during mounting and supports direct heat-sink attachment - making it a drop-in replacement for legacy TO-126-based video transistors like 2SC2073 or 2SC2482 in existing CRT designs.

What is the typical gain-bandwidth product (f_T) of the 2SC3789E and how is it measured?

The 2SC3789E has a typical f_T of 70 MHz, measured under conditions of V_CE = –30 V and I_C = –10 mA at T_a = 25°C. This parameter reflects the transistor's small-signal frequency limit where |h_fe| = 1, and is critical for preserving chroma signal phase and amplitude fidelity in NTSC/PAL video applications.

How does the 2SC3789E handle thermal dissipation in continuous operation?

The 2SC3789E is rated for 1.5 W collector dissipation at case temperature T_c = 25°C, with derating to zero at T_c = 150°C. Its plastic-covered heat sink design allows direct PCB copper pour contact, achieving ~83°C/W junction-to-case thermal resistance. For continuous video output use, thermal design must maintain T_c ≤ 80°C to sustain ≥1.0 W usable power.

What h_FE range corresponds to the 'E' suffix in 2SC3789E?

The 'E' suffix in 2SC3789E denotes h_FE binning Rank E: DC current gain between 100 and 200 at V_CE = –10 V and I_C = –10 mA. This tighter specification ensures predictable bias point stability and gain matching across units - essential for multi-channel CRT convergence and color balance calibration.

2SC3789E Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-225AA, TO-126-3

Packaging:: Bulk

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 100 mA

Voltage - Collector Emitter Breakdown (Max):: 300 V

Vce Saturation (Max) @ Ib, Ic:: -

Current - Collector Cutoff (Max):: -

DC Current Gain (hFE) (Min) @ Ic, Vce:: -

Power - Max:: 1.5 W

Frequency - Transition:: 70MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-225-3

2SC3789E FAQ

1.How can I place an order for 2SC3789E through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SC3789E 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 2SC3789E reliable?

The price and inventory of 2SC3789E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SC3789E is usually 5 days.

3.What payment methods are accepted for 2SC3789E?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SC3789E transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SC3789E?

2SC3789E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SC3789E 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 2SC3789E?

For technical support, including 2SC3789E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SC3789E requirements.

6.How does Aetrix verify that 2SC3789E is sourced from the original manufacturer or authorized distributors?

All 2SC3789E 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 2SC3789E meets industry standards.

7.What is the process for return or replacement of 2SC3789E?

All 2SC3789E units undergo pre-shipment inspection (PSI). If there is an issue with 2SC3789E, 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 2SC3789E part is unused and in its original packaging.

Return procedure for 2SC3789E:

1.Submit a request within 90 days.

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

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