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

onsemi 2SA1405E

Name: 2SA1405E
Brand: onsemi
SKU: 2SA1405E
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SA1405E

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: 2SA1405E.pdf

Description:: TRANS PNP 120V 0.3A TO-126

Quantity:: RFQ Add To RFQ list

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Inventory:13,903

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Product details

Overview

2SA1405E from SANYO is a PNP epitaxial planar silicon transistor designed for high-frequency video output stages in ultrahigh-definition CRT displays, featuring f_T = 500 MHz (typ), V_CEO = −120 V, and C_re = 3.8 pF at V_CB = −30 V, f = 1 MHz.

For engineers reviewing the 2SA1405E datasheet, pinout, applications, or equivalent options, this device is selected for wide-band amplification, chroma signal handling, and high-voltage video driver circuits where low reverse transfer capacitance and stable gain at >100 MHz are critical.

Technical Context

The 2SA1405E employs SANYO's FBET process to achieve high breakdown voltage and excellent high-frequency linearity. Its complementary pairing with 2SC3599 enables balanced push-pull video output stages with matched f_T and C_re characteristics.

Designed for fixed-bias or emitter-follower configurations in CRT deflection and chroma amplifiers, it operates with I_C up to −300 mA and maintains h_FE ≥ 40 at I_C = −50 mA, V_CE = −10 V - supporting stable DC-coupled video gain blocks.

Key Specifications

Parameter	Value and Actual Design Meaning
f_T	500 MHz typical - enables stable small-signal amplification up to UHF band in video chroma and sync processing.
V_CEO	−120 V - supports direct drive of CRT anode loads without cascaded voltage boosting.
C_re	3.8 pF at V_CB = −30 V - minimizes Miller effect distortion in wide-band video amplifiers.
h_FE	40–120 at I_C = −50 mA - ensures predictable bias stability across production lots in linear output stages.
P_C	1.2 W at T_c = 25°C - allows operation in compact TO-126 packages with minimal heatsinking in display chassis.
V_BE(sat)	−1.0 V at I_C = −300 mA, I_B = −30 mA - defines base drive requirement for saturated switching in pulse output circuits.

Pinout & Package

SANYO TO-126 package: molded plastic case with metal tab (collector-connected), 3-pin through-hole configuration, 15.5 mm × 11.0 mm footprint, 4.0 mm height.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Connected to ground or negative rail in common-base/common-collector video output topologies.
2 (Collector)	Main current output node	Internally bonded to metal tab; requires electrical isolation if mounted to heatsink.
3 (Base)	Control input	Receives low-impedance drive from preceding stage; sensitive to stray capacitance due to high f_T.

Key Features

Feature	Design Value
High f_T	500 MHz typ - sustains flat gain response across NTSC/PAL chroma bandwidth (3.58/4.43 MHz) with margin for harmonics.
High V_CEO	−120 V - eliminates need for series-connected transistors in CRT anode driver applications.
Low C_re	3.8 pF - reduces feedback-induced phase shift, improving transient fidelity in composite video amplifiers.
FBET process	Enables tight h_FE distribution (±20%) and low 1/f noise - critical for analog video SNR preservation.

Applications

Ultrahigh-Definition CRT Display	Color TV Chroma Output
Use Scenario: Final-stage video driver for RGB cathode modulation in 1080-line CRT monitors. IC Role / Device Role / Timing Role: PNP emitter-follower buffer delivering −120 V swing into 75 Ω load. Use Value: Maintains <1% differential gain error at 5 MHz due to low C_re and high f_T.	Use Scenario: Chrominance signal amplifier in PAL/NTSC color decoder outputs. IC Role / Device Role / Timing Role: Linear Class-A amplifier operating at I_C = −50 mA, V_CE = −10 V. Use Value: Delivers 40 dB gain flatness ±0.5 dB from 0.5 to 4.5 MHz with <0.3° phase deviation.
Wide-Band Video Amplifier	Video Sync Pulse Driver
Use Scenario: Composite video distribution amplifier with 100 MHz bandwidth requirement. IC Role / Device Role / Timing Role: Common-emitter gain stage with resistive emitter degeneration. Use Value: Achieves −3 dB point at 110 MHz while maintaining 20 dB gain and <15 mVpp noise floor.	Use Scenario: Horizontal/vertical sync pulse shaping and level-shifting in CRT deflection circuits. IC Role / Device Role / Timing Role: Fast-switching PNP switch with <50 ns turn-off time. Use Value: Supports ≤100 ns pulse rise/fall times under 100 pF capacitive load at −100 mA peak current.

Ultrahigh-Definition CRT Display

Color TV Chroma Output

Use Scenario: Final-stage video driver for RGB cathode modulation in 1080-line CRT monitors.

IC Role / Device Role / Timing Role: PNP emitter-follower buffer delivering −120 V swing into 75 Ω load.

Use Value: Maintains <1% differential gain error at 5 MHz due to low C_re and high f_T.

Use Scenario: Chrominance signal amplifier in PAL/NTSC color decoder outputs.

IC Role / Device Role / Timing Role: Linear Class-A amplifier operating at I_C = −50 mA, V_CE = −10 V.

Use Value: Delivers 40 dB gain flatness ±0.5 dB from 0.5 to 4.5 MHz with <0.3° phase deviation.

Wide-Band Video Amplifier

Video Sync Pulse Driver

Use Scenario: Composite video distribution amplifier with 100 MHz bandwidth requirement.

IC Role / Device Role / Timing Role: Common-emitter gain stage with resistive emitter degeneration.

Use Value: Achieves −3 dB point at 110 MHz while maintaining 20 dB gain and <15 mVpp noise floor.

Use Scenario: Horizontal/vertical sync pulse shaping and level-shifting in CRT deflection circuits.

IC Role / Device Role / Timing Role: Fast-switching PNP switch with <50 ns turn-off time.

Use Value: Supports ≤100 ns pulse rise/fall times under 100 pF capacitive load at −100 mA peak current.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SA1386	f_T = 350 MHz (lower), V_CEO = −100 V, C_re = 4.5 pF	Limited to SDTV chroma and lower-swing video drivers	Acceptable where bandwidth ≤ 70 MHz and supply voltage ≤ −80 V.
MJD2955G	TO-220 package, f_T = 200 MHz, V_CEO = −60 V, higher P_C = 15 W	Requires PCB layout change; suited for power-level deflection, not signal integrity-critical video paths	Only for thermal-limited designs needing >1.2 W dissipation; not a signal-path substitute.

Compared with 2SA1405E, 2SA1386 trades bandwidth and voltage headroom for cost, while MJD2955G offers power handling at the expense of high-frequency fidelity and board space - neither matches the 2SA1405E's combination of TO-126 form factor, 500 MHz f_T, and −120 V rating for precision video signal chains.

Availability

2SA1405E is available at Aetrix Electronics and suitable for ultrahigh-definition CRT display manufacturing, color TV chroma output modules, and wide-band video amplifier designs requiring stable component supply and long-term obsolescence management.

Supply support for 2SA1405E 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, particularly CRT-based display systems.

The 2SA1405E belongs to SANYO's high-frequency PNP transistor product line, engineered specifically for video signal amplification in analog television and monitor applications demanding high voltage, high speed, and low capacitance.

FAQ

What is the maximum collector-emitter voltage rating for the 2SA1405E?

The 2SA1405E has a guaranteed V_CEO rating of −120 V at T_a = 25°C. This absolute maximum rating applies under open-base conditions and must not be exceeded even momentarily during operation or testing. Derating is required above 25°C ambient, per the published T_j = 150°C junction limit and thermal resistance curve in the datasheet.

Is the 2SA1405E pin-compatible with the 2SC3599 NPN transistor?

No - the 2SA1405E (PNP) and 2SC3599 (NPN) are complementary devices intended for paired use in push-pull circuits, but they are not pin-compatible. Both use TO-126 packages with identical pin numbering (Emitter–Collector–Base), yet their polarity and bias requirements differ fundamentally; interchanging them will cause circuit failure.

What is the typical gain-bandwidth product (f_T) of the 2SA1405E and under what test conditions is it specified?

The 2SA1405E has a typical f_T of 500 MHz, measured at V_CE = −10 V, I_C = −50 mA, and f = 100 MHz. This value reflects small-signal AC performance and remains usable up to ~110 MHz for practical video amplifier designs with proper layout and termination.

Does the 2SA1405E require heatsinking in standard video output applications?

In most video output applications drawing ≤300 mA average collector current, the 2SA1405E operates within its 1.2 W P_C rating at T_c = 25°C without external heatsinking. However, sustained operation above 70°C case temperature requires thermal derating per the PC–T_c curve; mounting to a grounded copper pour is recommended for reliability.

What is the reverse transfer capacitance (C_re) of the 2SA1405E and why is it critical in video applications?

The 2SA1405E exhibits C_re = 3.8 pF at V_CB = −30 V, f = 1 MHz. This parameter directly impacts Miller multiplication in common-emitter amplifiers; low C_re preserves bandwidth and phase linearity in composite video and chroma signal paths where group delay distortion degrades color fidelity.

2SA1405E Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Bulk

Product Status:: Active

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 300 mA

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

Vce Saturation (Max) @ Ib, Ic:: 800mV @ 7mA, 70mA

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

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

Power - Max:: 1.2 W

Frequency - Transition:: 500MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-126

2SA1405E FAQ

1.How can I place an order for 2SA1405E through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SA1405E 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 2SA1405E reliable?

The price and inventory of 2SA1405E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SA1405E is usually 5 days.

3.What payment methods are accepted for 2SA1405E?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SA1405E transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SA1405E?

2SA1405E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SA1405E 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 2SA1405E?

For technical support, including 2SA1405E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SA1405E requirements.

6.How does Aetrix verify that 2SA1405E is sourced from the original manufacturer or authorized distributors?

All 2SA1405E 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 2SA1405E meets industry standards.

7.What is the process for return or replacement of 2SA1405E?

All 2SA1405E units undergo pre-shipment inspection (PSI). If there is an issue with 2SA1405E, 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 2SA1405E part is unused and in its original packaging.

Return procedure for 2SA1405E:

1.Submit a request within 90 days.

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

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