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onsemi KSA1406CSTU
- Part No.:
- KSA1406CSTU
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-225AA, TO-126-3
- Datasheet:
-
KSA1406CSTU.pdf
- Description:
- TRANS PNP 200V 0.1A TO-126-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,394
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Product details
Overview
KSA1406CSTU from Fairchild Semiconductor is a PNP epitaxial silicon transistor designed for high-voltage video output stages in CRT displays, featuring VCBO = −200 V, VCEO = −200 V, IC = −100 mA (DC), fT = 400 MHz (typ.), and Cob = 2.3 pF (typ.) at VCB = −30 V.
For engineers reviewing the KSA1406CSTU datasheet, pinout, applications, or equivalent options, key selection criteria include breakdown voltage margin, high-frequency gain stability, low reverse transfer capacitance for minimal signal coupling, and TO-126 thermal performance in analog video driver circuits.
Technical Context
This PNP bipolar junction transistor operates with emitter-grounded configuration in linear amplification or switching modes. Its −200 V collector-base and collector-emitter breakdown ratings support high-voltage deflection and anode drive in CRT horizontal/vertical output stages, while fT = 400 MHz enables stable gain up to UHF video bandwidths.
The device exhibits low Cre = 1.7 pF and Cob = 2.3 pF at VCB = −30 V, minimizing Miller effect and improving high-frequency response in tuned amplifier designs. Saturation voltages VCE(Sat) = −0.8 V and VBE(Sat) = −1.8 V (IC = −30 mA) confirm suitability for Class-A/B video output buffering with predictable conduction loss.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO | −200 V - Withstands high-voltage transients in CRT flyback circuits without breakdown |
| fT | 400 MHz (typ.) - Supports full-bandwidth video signal amplification up to ~150 MHz fundamental |
| Cob | 2.3 pF (typ., VCB = −30 V) - Limits high-frequency loading on preceding driver stage |
| hFE1 | 40–80 (VCE = −10 V, IC = −10 mA) - Provides stable DC biasing for linear video output operation |
| PC (TC = 25°C) | 7 W - Enables high-power dissipation when mounted on heatsink in TO-126 package |
| Cre | 1.7 pF (typ., VCB = −30 V) - Reduces feedback coupling in high-gain video amplifier configurations |
Pinout & Package
Package: TO-126 - Three-terminal plastic power package with integral heat slug; mounting hole allows mechanical fixation and thermal conduction to heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current source terminal | Connected to ground or low-impedance return path in common-emitter video output stage |
| 2 (Collector) | High-voltage output node | Drives CRT deflection yoke or anode supply through series inductor/load |
| 3 (Base) | Control input | Receives amplified drive signal; requires current-limited bias for stable hFE operation |
Key Features
| Feature | Design Value |
|---|---|
| High VCBO rating | −200 V supports safe operation under CRT flyback voltage spikes without avalanche stress |
| Low Cre capacitance | 1.7 pF minimizes unwanted signal feedback in wideband video amplifiers |
| High fT bandwidth | 400 MHz ensures flat gain response across composite video spectrum (0–5 MHz) with margin |
| TO-126 thermal capability | 7 W power dissipation at TC = 25°C enables reliable continuous operation in compact video chassis |
Applications
| CRT Horizontal Deflection | Video Output Amplifier |
|---|---|
Use Scenario: Driving horizontal deflection yoke in analog CRT monitors with flyback transformer coupling. IC Role / Device Role / Timing Role: PNP switch/amplifier operating in Class-B push-pull pair, handling peak currents up to −200 mA pulse. Use Value: −200 V VCBO withstands flyback-induced voltage reversals; low Cob prevents timing jitter from capacitive coupling. | Use Scenario: Final-stage amplification of composite video signal before CRT cathode input. IC Role / Device Role / Timing Role: Linear PNP emitter-follower buffer delivering low-impedance drive with minimal phase shift. Use Value: fT = 400 MHz ensures <0.1 dB gain flatness to 5 MHz; Cre = 1.7 pF avoids high-frequency peaking. |
| CRT Vertical Output Stage | High-Voltage Analog Switch |
Use Scenario: Sustained current delivery to vertical deflection coil during frame scan period. IC Role / Device Role / Timing Role: Medium-speed PNP amplifier biased for continuous conduction with thermal management. Use Value: PC = 7 W (TC = 25°C) enables stable 60 Hz frame-rate operation with heatsink; hFE1 = 40–80 ensures predictable bias current. | Use Scenario: High-voltage analog multiplexing in test equipment front-end or legacy instrumentation. IC Role / Device Role / Timing Role: PNP-controlled current path enabling/disabling >100 V signal paths with low leakage. Use Value: ICBO = −0.1 µA ensures <1 nA off-state leakage at −150 V; VEBO = −4 V supports base protection diode integration. |
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 |
|---|---|---|---|
| MJD127G | Higher IC = −8 A (DC), lower fT = 3 MHz, TO-220 package | Better suited for high-current, low-frequency power switching-not video bandwidth | Select when thermal load exceeds TO-126 limits but RF performance is not required |
| KSC2383Y | NPN polarity, fT = 150 MHz, VCBO = +160 V, TO-92 package | Requires circuit topology change; lower voltage rating and bandwidth than KSA1406CSTU | Consider only if NPN-based design exists and −200 V rating is not critical |
Compared with MJD127G and KSC2383Y, the KSA1406CSTU uniquely balances −200 V breakdown, 400 MHz fT, and TO-126 thermal efficiency-making it irreplaceable in legacy CRT video output where both voltage headroom and bandwidth are simultaneously constrained.
Availability
KSA1406CSTU is available at Aetrix Electronics and suitable for CRT display repair, analog video equipment maintenance, and industrial legacy system sustainment requiring stable component supply with long-lifecycle traceability.
Supply support for KSA1406CSTU 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 devices before its acquisition by ON Semiconductor in 2016.
The KSA1406CSTU belongs to Fairchild's legacy high-voltage PNP transistor product line, engineered specifically for analog video output and CRT deflection applications demanding robust voltage tolerance and controlled high-frequency response.
FAQ
What is the maximum collector-emitter voltage rating for KSA1406CSTU?
The KSA1406CSTU has a guaranteed VCEO rating of −200 V at TC = 25°C. This rating ensures safe operation in CRT horizontal output circuits where flyback-induced voltage spikes commonly exceed −150 V. Derating is required above 25°C case temperature per the published power derating curve in the datasheet.
Is KSA1406CSTU pin-compatible with other TO-126 PNP transistors like KSA992?
No, KSA1406CSTU is not pin-compatible with KSA992. While both use TO-126 packages, KSA992 has emitter-collector pinout reversed (1=Collector, 2=Emitter, 3=Base). Swapping them will cause immediate reverse-bias failure. Always verify pin assignment using the official Fairchild KSA1406CSTU datasheet diagram.
What does the 'C' suffix in KSA1406CSTU indicate?
The 'C' in KSA1406CSTU denotes the hFE1 classification group: 40–80 at VCE = −10 V and IC = −10 mA. This distinguishes it from the 'D' variant (60–120 hFE1). The full part number KSA1406CSTU confirms TO-126 package ('TU' suffix), PNP polarity ('KSA' prefix), and Fairchild manufacturing origin.
Can KSA1406CSTU be used in switching power supplies?
KSA1406CSTU is not optimized for modern SMPS applications due to relatively slow switching speed (no specified tON/tOFF), lack of avalanche ruggedness rating, and absence of gate-drive compatibility. Its design focus is linear video amplification and deflection-use dedicated power switches like FQP series MOSFETs instead for switching supplies.
What is the typical Cob value for KSA1406CSTU and why does it matter?
KSA1406CSTU has a typical Cob of 2.3 pF at VCB = −30 V and f = 1 MHz. This output capacitance directly loads the preceding driver stage and affects high-frequency gain roll-off. In CRT video output, low Cob helps maintain flat amplitude response up to 5 MHz and reduces risk of oscillation in broadband amplifier layouts.
KSA1406CSTU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-225AA, TO-126-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 100 mA
- Voltage - Collector Emitter Breakdown (Max):
- 200 V
- Vce Saturation (Max) @ Ib, Ic:
- 800mV @ 3mA, 30mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 40 @ 10mA, 10V
- Power - Max:
- 1.2 W
- Frequency - Transition:
- 400MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-126-3
KSA1406CSTU FAQ
1.How can I place an order for KSA1406CSTU through Aetrix?
Please submit a Request for Quotation (RFQ) for KSA1406CSTU 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 KSA1406CSTU reliable?
The price and inventory of KSA1406CSTU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSA1406CSTU is usually 5 days.
3.What payment methods are accepted for KSA1406CSTU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSA1406CSTU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSA1406CSTU?
KSA1406CSTU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSA1406CSTU 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 KSA1406CSTU?
For technical support, including KSA1406CSTU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSA1406CSTU requirements.
6.How does Aetrix verify that KSA1406CSTU is sourced from the original manufacturer or authorized distributors?
All KSA1406CSTU 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 KSA1406CSTU meets industry standards.
7.What is the process for return or replacement of KSA1406CSTU?
All KSA1406CSTU units undergo pre-shipment inspection (PSI). If there is an issue with KSA1406CSTU, 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 KSA1406CSTU part is unused and in its original packaging.
Return procedure for KSA1406CSTU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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