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

onsemi 2SC3954E

Name: 2SC3954E
Brand: onsemi
SKU: 2SC3954E
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SC3954E

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: 2SC3954E.pdf

Description:: TRANS NPN 120V 0.3A TO-126ML

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2SC3954E from SANYO is an NPN epitaxial planar silicon transistor designed for high-definition CRT display video output stages, featuring f_T = 500 MHz, V_CEO = −120 V (min), I_C = −300 mA (max), P_C = 1.3 W, and C_re = 2.7 pF at V_CB = −30 V.

For engineers reviewing the 2SC3954E datasheet, pinout, applications, or equivalent options, this device is selected for wide-band video amplification where high breakdown voltage, low reverse transfer capacitance, and stable HF gain are critical in analog display driver circuits.

Technical Context

The 2SC3954E operates as a high-speed switching and linear amplification transistor in complementary pair configurations with its PNP counterpart 2SA1539. Its FBET process ensures tight h_FE distribution (h_FE1: 20–40 at I_C = −50 mA, V_CE = −10 V) and low saturation voltage (V_CE(sat) ≤ −1.0 V at I_C/I_B = 10).

It delivers stable RF performance up to 500 MHz with minimal phase distortion, enabled by low C_ob (1.3 pF) and C_re (2.7 pF), and supports DC-to-pulse operation up to 600 mA peak collector current under specified thermal conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
f_T	500 MHz - Enables stable wideband video amplification up to UHF frequencies without gain roll-off.
V_CEO	−120 V (min) - Supports high-voltage CRT anode drive and deflection circuit integration without breakdown risk.
I_C (max)	−300 mA - Sustains continuous video output current for high-brightness CRT scanning applications.
P_C	1.3 W at T_a = 25°C - Allows direct mounting on PCB without heatsink for moderate-duty video output stages.
C_re	2.7 pF at V_CB = −30 V - Minimizes reverse feedback in high-gain video amplifier configurations.
h_FE	20–40 at I_C = −50 mA, V_CE = −10 V - Provides predictable DC bias stability in emitter-follower and Class-A video drivers.
V_CE(sat)	≤ −1.0 V at I_C/I_B = 10 - Reduces power loss and thermal stress during saturated switching in pulse-driven deflection circuits.

Pinout & Package

2SC3954E uses the TO-126ML (micaless) plastic package - a 3-lead through-hole outline with integrated heat-dissipating tab, optimized for cost-sensitive analog video systems requiring mechanical robustness and thermal reliability without insulating washers.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Low-impedance current sink node; connected to ground or cathode return path in video output stage.
2	Collector	Main power output terminal; directly interfaces with CRT grid/anode load or deflection yoke winding.
3	Base	Control input for current amplification; requires precise bias network to maintain linearity across 0–10 MHz video bandwidth.

Key Features

Feature	Design Value
High f_T	500 MHz - Ensures flat small-signal gain response across full NTSC/PAL video bandwidth (0–5.5 MHz) with margin.
High V_CEO	−120 V min - Eliminates need for series voltage division in CRT high-voltage video driver topologies.
Low C_re	2.7 pF - Suppresses Miller-effect instability in common-emitter video amplifiers operating near unity-gain frequency.
Complementary Pairing	Matched with 2SA1539 - Enables push-pull video output stages with symmetrical slew rate and crossover distortion control.
FBET Process	Guaranteed h_FE binning (20–40) - Simplifies production calibration of bias networks in mass-produced CRT monitors.

Applications

High-Definition CRT Video Output	Wide-Band Analog Amplifier
Use Scenario: Final-stage video driver in 1024×768 CRT monitors, delivering composite or RGB signals to electron gun modulation grids. IC Role / Device Role / Timing Role: NPN current amplifier in grounded-emitter configuration, handling 1–5 V_pp video swing at 100 mA average load. Use Value: High V_CEO and low C_re preserve signal fidelity and prevent arcing during flyback retrace intervals.	Use Scenario: Broadband intermediate-frequency amplifier in analog TV tuners and video processing boards. IC Role / Device Role / Timing Role: Linear gain block operating from DC to 50 MHz, biased in Class-A for minimal harmonic distortion. Use Value: 500 MHz f_T ensures ≥20 dB gain flatness across entire video band without external compensation.
Deflection Yoke Driver	High-Voltage Pulse Switch
Use Scenario: Horizontal deflection output stage driving yoke windings in 32–36 kHz scan circuits. IC Role / Device Role / Timing Role: Switching transistor conducting 300–600 mA pulses with <1 µs rise/fall times. Use Value: Low V_CE(sat) and fast turn-on reduce conduction loss and EMI generation during scanning transitions.	Use Scenario: Trigger switch for flashlamp or high-voltage capacitor discharge in medical imaging equipment. IC Role / Device Role / Timing Role: Fast-switching NPN switch controlling 100–120 V DC pulses with 1 ms duty cycle. Use Value: −120 V V_CEO rating enables safe operation across full capacitor charge voltage without snubber networks.

High-Definition CRT Video Output

Wide-Band Analog Amplifier

Use Scenario: Final-stage video driver in 1024×768 CRT monitors, delivering composite or RGB signals to electron gun modulation grids.

IC Role / Device Role / Timing Role: NPN current amplifier in grounded-emitter configuration, handling 1–5 V_pp video swing at 100 mA average load.

Use Value: High V_CEO and low C_re preserve signal fidelity and prevent arcing during flyback retrace intervals.

Use Scenario: Broadband intermediate-frequency amplifier in analog TV tuners and video processing boards.

IC Role / Device Role / Timing Role: Linear gain block operating from DC to 50 MHz, biased in Class-A for minimal harmonic distortion.

Use Value: 500 MHz f_T ensures ≥20 dB gain flatness across entire video band without external compensation.

Deflection Yoke Driver

High-Voltage Pulse Switch

Use Scenario: Horizontal deflection output stage driving yoke windings in 32–36 kHz scan circuits.

IC Role / Device Role / Timing Role: Switching transistor conducting 300–600 mA pulses with <1 µs rise/fall times.

Use Value: Low V_CE(sat) and fast turn-on reduce conduction loss and EMI generation during scanning transitions.

Use Scenario: Trigger switch for flashlamp or high-voltage capacitor discharge in medical imaging equipment.

IC Role / Device Role / Timing Role: Fast-switching NPN switch controlling 100–120 V DC pulses with 1 ms duty cycle.

Use Value: −120 V V_CEO rating enables safe operation across full capacitor charge voltage without snubber networks.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SC3854	f_T = 350 MHz, V_CEO = −100 V, C_re = 3.5 pF	Limited bandwidth headroom; higher C_re increases risk of oscillation above 3 MHz	Select when cost sensitivity outweighs need for full HD video bandwidth margin.
2SC4027	f_T = 600 MHz, V_CEO = −130 V, P_C = 1.5 W, TO-126ML compatible	Higher power and frequency capability; tighter h_FE spread (30–60)	Prefer for next-generation CRT designs requiring extended bandwidth or higher pulse current.

Compared with 2SC3954E, the 2SC3854 offers lower cost but reduced HF stability margin, while the 2SC4027 provides superior bandwidth and voltage headroom at slightly higher price-both require validation of bias network compatibility due to differing h_FE and V_CE(sat) profiles.

Availability

2SC3954E is available at Aetrix Electronics and suitable for high-definition CRT display video output, wide-band analog amplification, and horizontal deflection yoke driver applications requiring stable component supply and long-term obsolescence management.

Supply support for 2SC3954E 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 and power devices for consumer electronics, known for high-reliability discrete transistors and ICs before its acquisition by ON Semiconductor in 2011.

The 2SC3954E belongs to SANYO's high-frequency video transistor product line, engineered specifically for analog CRT display systems demanding high voltage tolerance, wide bandwidth, and thermal stability in compact through-hole packages.

FAQ

What is the maximum collector-emitter voltage rating for the 2SC3954E?

The 2SC3954E has a guaranteed minimum V_CEO rating of −120 V at T_a = 25°C. This rating applies under continuous DC operation with proper thermal management; exceeding this voltage-even momentarily-may cause irreversible avalanche breakdown. Derating is required above 25°C ambient per the PC–Ta curve in the official SANYO specification sheet No.2438-4/4.

Does the 2SC3954E have a complementary PNP transistor?

Yes, the 2SC3954E is explicitly paired with the 2SA1539 PNP transistor. Both share identical TO-126ML packaging, matched f_T, V_CEO/V_EBO ratings, and complementary h_FE ranges, enabling balanced push-pull video output stages. Their datasheet (No.2438) documents joint electrical characteristics and thermal curves.

What is the typical reverse transfer capacitance (C_re) of the 2SC3954E?

The 2SC3954E exhibits C_re = 2.7 pF (typical) at V_CB = −30 V and f = 1 MHz. This low value is critical for minimizing Miller feedback in high-gain video amplifiers and contributes to its stable 500 MHz f_T. Measured values range from 2.0 pF to 4.0 pF across production lots per specification sheet No.2438-2/4.

Can the 2SC3954E be used in pulse applications with 600 mA peak current?

Yes-the 2SC3954E supports I_CP = −600 mA peak collector current for pulse widths ≤1 ms at T_c = 25°C, as confirmed in the Safe Operating Area (SOA) chart (ITR03937). Continuous operation beyond 300 mA requires derated voltage or active cooling to avoid secondary breakdown.

Is the 2SC3954E available in tape-and-reel packaging for automated assembly?

No-original SANYO documentation specifies only bulk and tube packaging for the 2SC3954E (Ordering Number ENN2438C). Aetrix Electronics supplies it in original factory tubes compatible with manual and semi-automated insertion; tape-and-reel conversion is not offered due to TO-126ML leadform constraints and obsolescence status.

2SC3954E 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):: 300 mA

Voltage - Collector Emitter Breakdown (Max):: 120 V

Vce Saturation (Max) @ Ib, Ic:: 1V @ 5mA, 50mA

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 50mA, 10V

Power - Max:: 1.3 W

Frequency - Transition:: 400MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-126ML

2SC3954E FAQ

1.How can I place an order for 2SC3954E through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SC3954E 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 2SC3954E reliable?

The price and inventory of 2SC3954E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SC3954E is usually 5 days.

3.What payment methods are accepted for 2SC3954E?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SC3954E transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SC3954E?

2SC3954E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SC3954E 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 2SC3954E?

For technical support, including 2SC3954E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SC3954E requirements.

6.How does Aetrix verify that 2SC3954E is sourced from the original manufacturer or authorized distributors?

All 2SC3954E 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 2SC3954E meets industry standards.

7.What is the process for return or replacement of 2SC3954E?

All 2SC3954E units undergo pre-shipment inspection (PSI). If there is an issue with 2SC3954E, 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 2SC3954E part is unused and in its original packaging.

Return procedure for 2SC3954E:

1.Submit a request within 90 days.

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

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