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onsemi KSA709CGBU
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- Part No.:
- KSA709CGBU
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
KSA709CGBU.pdf
- Description:
- TRANS PNP 150V 0.7A TO-92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,442
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Product details
Overview
KSA709CGBU from ON Semiconductor (formerly Fairchild) is a PNP epitaxial silicon transistor designed for high-voltage amplifier and switching applications, featuring VCBO = −160 V, VCEO = −150 V, IC = −700 mA, PC = 800 mW, and fT = 50 MHz. It is commonly used in horizontal deflection output stages and high-voltage DC-DC converter control circuits.
For engineers reviewing the KSA709CGBU datasheet, pinout, applications, or equivalent options, key selection criteria include its center-collector TO-92 configuration, hFE classification (G: 200–400), saturation voltage performance at IC = −200 mA/IB = −20 mA, and complementary pairing with KSC1009.
Technical Context
This PNP bipolar junction transistor operates with reverse-polarity voltage ratings optimized for high-side switching and linear amplification in negative-rail systems. Its −150 V VCEO and −160 V VCBO support operation in flyback snubbers and CRT deflection supplies where high breakdown margin is critical.
The device exhibits hFE = 200–400 (G-class), VCE(sat) = −0.3 to −0.4 V and VBE(sat) = −0.9 to −1.0 V under IC = −200 mA/IB = −20 mA conditions, enabling efficient saturated switching with low conduction loss. Cob = 10 pF at VCB = −10 V supports stable high-frequency gain up to 50 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO | −160 V: Maximum reverse voltage between collector and base before breakdown; enables use in high-voltage clamp and snubber networks. |
| VCEO | −150 V: Maximum reverse voltage between collector and emitter; suitable for horizontal output stages in CRT displays. |
| IC | −700 mA: Continuous collector current rating; supports medium-power switching without forced cooling. |
| PC | 800 mW: Total power dissipation at Ta = 25°C; defines thermal derating envelope for PCB-mounted operation. |
| fT | 50 MHz: Current-gain bandwidth product; confirms usable small-signal amplification up to VHF band. |
| hFE (G-class) | 200–400: DC current gain range at VCE = −2 V, IC = −50 mA; ensures predictable base drive requirements in linear and switching designs. |
| Cob | 10 pF at VCB = −10 V: Output capacitance limiting high-frequency roll-off and affecting switching speed in tuned circuits. |
Pinout & Package
Package: TO-92, molded plastic case with center-collector lead configuration (Pin 1: Emitter, Pin 2: Collector, Pin 3: Base).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current source terminal for PNP operation | Connected to most positive rail in common-emitter switch; sets reference for base bias and current sourcing path. |
| 2 (Collector) | Current sink terminal | Center-pin placement simplifies PCB layout for heat-sensitive high-voltage nodes; ties to load or transformer primary in flyback topologies. |
| 3 (Base) | Control input for minority-carrier injection | Requires negative-going drive relative to emitter; base resistor sizing must account for hFE spread (200–400) to ensure saturation across temperature. |
Key Features
| Feature | Design Value |
|---|---|
| High breakdown voltage | VCBO = −160 V and VCEO = −150 V enable reliable operation in CRT horizontal deflection and industrial HV power supplies. |
| G-class hFE binning | hFE = 200–400 ensures consistent base drive design across production lots without recalibration. |
| Low saturation voltage | VCE(sat) = −0.3 to −0.4 V at IC = −200 mA reduces conduction loss and self-heating in switching applications. |
| Complementary pairing | Designed as PNP counterpart to NPN KSC1009; allows matched push-pull stage implementation with symmetric gain and timing. |
| TO-92 center-collector | Pin 2 = Collector improves thermal and electrical isolation of high-voltage collector node from adjacent traces on single-sided PCBs. |
Applications
| Horizontal Deflection Output | Flyback Converter Switch |
|---|---|
Use Scenario: Horizontal scanning circuit in CRT television and monitor power supplies requiring repetitive high-voltage pulse generation. IC Role / Device Role / Timing Role: PNP switching transistor driving the horizontal output transformer primary with −150 V VCEO margin against flyback spikes. Use Value: High VCBO and low VCE(sat) minimize energy loss during retrace and improve efficiency in legacy display systems. | Use Scenario: Primary-side switch in isolated DC-DC converters operating up to 100 kHz with regulated 12–24 V outputs. IC Role / Device Role / Timing Role: Medium-power PNP switch controlling energy transfer into transformer primary; driven by discrete oscillator or PWM controller. Use Value: 50 MHz fT supports clean square-wave edge integrity; G-class hFE ensures stable duty-cycle control across temperature. |
| High-Voltage Linear Amplifier | Relay Driver Stage |
Use Scenario: Audio or signal amplification in negative-rail instrumentation where high common-mode rejection and linearity are required. IC Role / Device Role / Timing Role: Common-emitter amplifier stage biased for Class-A operation with VCE = −10 V and IC = −50 mA. Use Value: Low Cob (10 pF) preserves bandwidth; hFE consistency minimizes gain drift in feedback-coupled configurations. | Use Scenario: Interface between microcontroller GPIO and electromagnetic relay coil requiring −700 mA peak current and −150 V back-EMF suppression. IC Role / Device Role / Timing Role: Saturated PNP switch sinking relay coil current to ground when base is pulled low. Use Value: −0.4 V max VCE(sat) limits relay coil voltage drop; TO-92 center-collector isolates high-voltage transient from logic side. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP high-voltage switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPSA92 | VCEO = −300 V, IC = −500 mA, PC = 625 mW, hFE = 25–250 (unbinned), TO-92 | Higher breakdown but lower current/power; narrower hFE range increases base drive sensitivity. | Preferred where >−200 V breakdown is mandatory and load current stays below 500 mA. |
| KSA992 | VCEO = −180 V, IC = −1 A, PC = 1 W, hFE = 200–400 (G-class), TO-126 | Higher power handling and same hFE binning, but larger TO-126 package requires board redesign. | Chosen when thermal management demands >800 mW dissipation and PCB space permits larger footprint. |
Compared with KSA709CGBU, MPSA92 offers superior voltage margin but reduced current capability and uncontrolled hFE, while KSA992 delivers higher power and matching gain binning at the cost of TO-126 packaging-making KSA709CGBU optimal for space-constrained TO-92 designs needing balanced HV, current, and gain stability.
Availability
KSA709CGBU is available at Aetrix Electronics and suitable for horizontal deflection circuits, flyback converter switches, high-voltage linear amplifiers, and relay driver stages requiring stable component supply and long-term obsolescence mitigation.
Supply support for KSA709CGBU 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
ON Semiconductor is a global semiconductor supplier delivering energy-efficient, high-performance silicon solutions for automotive, industrial, cloud computing, and IoT applications.
The KSA709CGBU belongs to Fairchild's legacy "FACT Quiet Series™" high-voltage transistor family, engineered specifically for reliability-critical analog and power-switching roles in consumer display and industrial power conversion equipment.
FAQ
What is the pin configuration of the KSA709CGBU?
The KSA709CGBU uses a TO-92 package with center-collector pinout: Pin 1 is Emitter, Pin 2 is Collector, and Pin 3 is Base. This configuration is explicitly defined in the Fairchild datasheet Rev. B1 and distinguishes it from standard emitter-collector-base layouts. The center-collector arrangement aids in high-voltage isolation and thermal management on compact PCBs.
What does the "C" suffix in KSA709CGBU indicate?
The "C" suffix in KSA709CGBU denotes Center Collector - confirming the TO-92 pin assignment where the collector is located at the center pin (Pin 2). This is documented in the original Fairchild datasheet and differentiates it from variants like KSA709Y or KSA709O, which share electrical specs but differ only in hFE binning.
Is the KSA709CGBU RoHS compliant?
The KSA709CGBU was manufactured prior to full RoHS enforcement and is not certified RoHS-compliant. It contains lead in the solderable finish and meets legacy JEDEC standards per its April 2004 datasheet. For new designs requiring RoHS compliance, consult ON Semiconductor's actively supported replacements or qualified alternatives.
What is the maximum safe operating temperature for the KSA709CGBU?
The KSA709CGBU has a maximum junction temperature (TJ) of 150°C and storage temperature range of −55°C to +150°C. Safe continuous operation requires maintaining TJ ≤ 150°C via appropriate PCB copper area, ambient derating, and ensuring PC does not exceed 800 mW at 25°C ambient - with linear derating above 25°C per the datasheet's thermal resistance curve.
How does the hFE classification affect KSA709CGBU performance?
The "G" in KSA709CGBU indicates hFE = 200–400 at VCE = −2 V and IC = −50 mA. This tight binning ensures predictable base current requirements across units, reducing design margin needed for saturation in switching applications and improving gain stability in linear amplifier configurations compared to unbinned transistors.
KSA709CGBU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 700 mA
- Voltage - Collector Emitter Breakdown (Max):
- 150 V
- Vce Saturation (Max) @ Ib, Ic:
- 400mV @ 20mA, 200mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 200 @ 50mA, 2V
- Power - Max:
- 800 mW
- Frequency - Transition:
- 50MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
KSA709CGBU FAQ
1.How can I place an order for KSA709CGBU through Aetrix?
Please submit a Request for Quotation (RFQ) for KSA709CGBU 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 KSA709CGBU reliable?
The price and inventory of KSA709CGBU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSA709CGBU is usually 5 days.
3.What payment methods are accepted for KSA709CGBU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSA709CGBU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSA709CGBU?
KSA709CGBU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSA709CGBU 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 KSA709CGBU?
For technical support, including KSA709CGBU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSA709CGBU requirements.
6.How does Aetrix verify that KSA709CGBU is sourced from the original manufacturer or authorized distributors?
All KSA709CGBU 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 KSA709CGBU meets industry standards.
7.What is the process for return or replacement of KSA709CGBU?
All KSA709CGBU units undergo pre-shipment inspection (PSI). If there is an issue with KSA709CGBU, 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 KSA709CGBU part is unused and in its original packaging.
Return procedure for KSA709CGBU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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