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

onsemi KSA1370FBU

Name: KSA1370FBU
Brand: onsemi
SKU: KSA1370FBU
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KSA1370FBU

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 Long Body

Datasheet:: KSA1370FBU.pdf

Description:: TRANS PNP 200V 0.1A TO-92-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

KSA1370FBU from Fairchild Semiconductor is a PNP epitaxial silicon transistor rated for -200 V collector-emitter and collector-base voltage, -100 mA DC collector current, 1.0 W power dissipation, and 150 MHz current gain bandwidth product; it is used in CRT display video output stages requiring high-voltage switching and low reverse transfer capacitance.

For engineers reviewing the KSA1370FBU datasheet, pinout, applications, or equivalent options, this device is selected for high-voltage PNP amplification and switching where Cre ≤ 1.7 pF, V_CE(sat) ≤ -0.6 V at -20 mA/-2 mA, and h_FE = 100–320 at -10 mA/-10 V are critical design constraints.

Technical Context

This PNP bipolar junction transistor operates with emitter-grounded configuration in linear and saturated switching modes. Its high breakdown voltages (-200 V V_CEO, -200 V V_CBO) and low Cre (1.7 pF) support stable high-voltage video signal amplification without parasitic coupling.

The device delivers DC current gain of 100–320 at V_CE = -10 V and I_C = -10 mA, with saturation voltage of -0.6 V under I_C = -20 mA/I_B = -2 mA drive, enabling efficient active-load switching in CRT deflection and output driver circuits.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	-200 V - supports operation in high-voltage CRT video output stages without breakdown
h_FE	100–320 - enables stable current amplification across production lots at -10 mA bias
V_CE(sat)	-0.6 V - ensures low conduction loss when fully turned on with -2 mA base drive
f_T	150 MHz - provides sufficient bandwidth for video-frequency signal handling up to ~20 MHz fundamental
Cre	1.7 pF - minimizes unwanted feedback in high-gain video amplifier configurations
P_C	1.0 W - allows continuous operation at elevated ambient temperatures with appropriate heatsinking
I_C (DC)	-100 mA - defines maximum steady-state collector current before thermal derating applies

Pinout & Package

Package: TO-92L (3-lead plastic through-hole), lead spacing 2.54 mm, case height ≤ 1.00 mm, body width 3.90 mm.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Current exit terminal; connected to ground or low-impedance return path in common-emitter video amplifier
2	Collector	High-voltage output node; interfaces directly with CRT anode supply or deflection yoke winding
3	Base	Control input; requires negative bias relative to emitter to turn on PNP device

Key Features

Feature	Design Value
High breakdown voltage	V_CEO = V_CB0 = -200 V enables direct use in 150–180 V CRT anode driver circuits
Low reverse transfer capacitance	Cre = 1.7 pF reduces Miller-effect instability in wideband video amplifiers
High f_T	150 MHz f_T supports flat frequency response up to ~20 MHz for analog video signals
Stable h_FE range	100–320 h_FE at -10 mA ensures predictable biasing across temperature and unit-to-unit variation

Applications

CRT Display Video Output	High-Voltage Switching Amplifier
Use Scenario: Driving vertical/horizontal deflection yokes and video anode supplies in analog CRT monitors and TVs. IC Role / Device Role / Timing Role: PNP switching amplifier operating in Class-A or Class-AB mode with emitter-follower or common-emitter topology. Use Value: -200 V V_CEO rating and 1.0 W power dissipation allow direct interface with 150–180 V CRT supplies without external snubbers.	Use Scenario: High-voltage level-shifting and pulse amplification in legacy industrial scan generators and oscilloscope vertical amplifiers. IC Role / Device Role / Timing Role: Active load or saturated switch controlling high-side current paths in precision timing circuits. Use Value: Low V_CE(sat) (-0.6 V) and high h_FE reduce base drive requirements and improve switching efficiency at -20 mA loads.
Video Signal Buffer Stage	Analog Monitor Deflection Driver
Use Scenario: Isolating and buffering composite video or RGB signals prior to CRT grid modulation. IC Role / Device Role / Timing Role: Emitter-follower buffer providing low-output-impedance drive while maintaining DC level shift. Use Value: Cre = 1.7 pF prevents high-frequency signal degradation and crosstalk between adjacent video channels.	Use Scenario: Driving magnetic deflection coils in monochrome and color CRT displays requiring fast current slew and voltage headroom. IC Role / Device Role / Timing Role: Linear power stage operating in active region with fixed bias and dynamic load compensation. Use Value: 150 MHz f_T and -100 mA I_C rating ensure fidelity across full video bandwidth (0–5 MHz) with minimal phase distortion.

CRT Display Video Output

High-Voltage Switching Amplifier

Use Scenario: Driving vertical/horizontal deflection yokes and video anode supplies in analog CRT monitors and TVs.

IC Role / Device Role / Timing Role: PNP switching amplifier operating in Class-A or Class-AB mode with emitter-follower or common-emitter topology.

Use Value: -200 V V_CEO rating and 1.0 W power dissipation allow direct interface with 150–180 V CRT supplies without external snubbers.

Use Scenario: High-voltage level-shifting and pulse amplification in legacy industrial scan generators and oscilloscope vertical amplifiers.

IC Role / Device Role / Timing Role: Active load or saturated switch controlling high-side current paths in precision timing circuits.

Use Value: Low V_CE(sat) (-0.6 V) and high h_FE reduce base drive requirements and improve switching efficiency at -20 mA loads.

Video Signal Buffer Stage

Analog Monitor Deflection Driver

Use Scenario: Isolating and buffering composite video or RGB signals prior to CRT grid modulation.

IC Role / Device Role / Timing Role: Emitter-follower buffer providing low-output-impedance drive while maintaining DC level shift.

Use Value: Cre = 1.7 pF prevents high-frequency signal degradation and crosstalk between adjacent video channels.

Use Scenario: Driving magnetic deflection coils in monochrome and color CRT displays requiring fast current slew and voltage headroom.

IC Role / Device Role / Timing Role: Linear power stage operating in active region with fixed bias and dynamic load compensation.

Use Value: 150 MHz f_T and -100 mA I_C rating ensure fidelity across full video bandwidth (0–5 MHz) with minimal phase distortion.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
KSA992FBU	V_CEO = -160 V, f_T = 120 MHz, Cre = 2.0 pF	Lower voltage rating limits use in >160 V CRT supplies; otherwise compatible in lower-voltage video drivers	Select when system supply is ≤150 V and cost sensitivity outweighs need for 200 V margin
MJD2955G	TO-220 package, I_C = -12 A, V_CEO = -60 V, f_T = 3 MHz	Higher current but much lower voltage and bandwidth; suited for power regulation, not video amplification	Use only in non-video, high-current PNP switching roles where voltage stress <60 V

Compared with KSA1370FBU, KSA992FBU trades 40 V breakdown margin and 30 MHz bandwidth for broader availability, while MJD2955G serves entirely different high-current/low-voltage applications-neither is pin-compatible, and both require circuit redesign for substitution.

Availability

KSA1370FBU is available at Aetrix Electronics and suitable for CRT display video output, high-voltage switching amplifier, and analog monitor deflection driver applications requiring stable component supply and long-lifecycle support.

Supply support for KSA1370FBU 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

Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.

The KSA1370FBU belongs to Fairchild's legacy high-voltage PNP transistor family designed specifically for analog video signal processing and CRT-based display systems.

FAQ

What is the maximum collector-emitter voltage rating for KSA1370FBU?

The KSA1370FBU has a maximum collector-emitter voltage (V_CEO) rating of -200 V at T_A = 25°C. This rating is confirmed in the Absolute Maximum Ratings table and applies under DC conditions with proper thermal management. Exceeding this voltage risks avalanche breakdown and permanent device failure. The KSA1370FBU must be operated within this limit in all CRT video output and high-voltage amplifier designs.

Is KSA1370FBU suitable for video amplifier applications?

Yes, the KSA1370FBU is explicitly designated for CRT display video output applications per its original Fairchild documentation. Its 150 MHz f_T, low Cre (1.7 pF), and -200 V breakdown make it suitable for wideband analog video amplification. The KSA1370FBU maintains stable h_FE and low V_CE(sat) across video signal frequencies, supporting linearity and minimal phase shift in legacy monitor designs.

What is the pin configuration of KSA1370FBU in TO-92L package?

The KSA1370FBU uses a TO-92L package with standardized lead assignment: Pin 1 is Emitter, Pin 2 is Collector, and Pin 3 is Base - verified from Fairchild's package drawing and marking diagram. This configuration is consistent across all KSA1370 variants and must be observed during PCB layout to avoid functional failure. The KSA1370FBU requires correct orientation during manual or automated assembly.

Does KSA1370FBU have a specified junction temperature limit?

Yes, the KSA1370FBU has a maximum junction temperature (T_J) rating of 150°C, as stated in the Absolute Maximum Ratings section. Operation beyond this temperature accelerates degradation and may cause thermal runaway. Derating curves in the datasheet show safe operating area reduction above 25°C case temperature. Thermal design for the KSA1370FBU must ensure T_J remains ≤150°C under worst-case load and ambient conditions.

What is the typical DC current gain (h_FE) of KSA1370FBU at standard test conditions?

The KSA1370FBU exhibits a DC current gain (h_FE) ranging from 100 to 320 when measured at V_CE = -10 V and I_C = -10 mA, per the Electrical Characteristics table. This wide but guaranteed range reflects process variation and supports robust bias network design. The KSA1370FBU's h_FE remains stable across temperature, making it suitable for production-critical CRT video circuits where gain consistency is essential.

KSA1370FBU Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-226-3, TO-92-3 Long Body

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: PNP

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

Voltage - Collector Emitter Breakdown (Max):: 200 V

Vce Saturation (Max) @ Ib, Ic:: 600mV @ 2mA, 20mA

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

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

Power - Max:: 1 W

Frequency - Transition:: 150MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

KSA1370FBU FAQ

1.How can I place an order for KSA1370FBU through Aetrix?

Please submit a Request for Quotation (RFQ) for KSA1370FBU 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 KSA1370FBU reliable?

The price and inventory of KSA1370FBU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSA1370FBU is usually 5 days.

3.What payment methods are accepted for KSA1370FBU?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSA1370FBU transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KSA1370FBU?

KSA1370FBU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KSA1370FBU 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 KSA1370FBU?

For technical support, including KSA1370FBU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSA1370FBU requirements.

6.How does Aetrix verify that KSA1370FBU is sourced from the original manufacturer or authorized distributors?

All KSA1370FBU 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 KSA1370FBU meets industry standards.

7.What is the process for return or replacement of KSA1370FBU?

All KSA1370FBU units undergo pre-shipment inspection (PSI). If there is an issue with KSA1370FBU, 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 KSA1370FBU part is unused and in its original packaging.

Return procedure for KSA1370FBU:

1.Submit a request within 90 days.

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

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