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onsemi KSB546O
- Part No.:
- KSB546O
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-220-3
- Datasheet:
-
KSB546O.pdf
- Description:
- TRANS PNP 150V 2A TO-220-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,973
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Product details
Overview
KSB546O from ON Semiconductor is a PNP epitaxial silicon power transistor designed for TV vertical deflection output stages, featuring -200 V collector-base voltage, -2 A continuous collector current, 25 W collector dissipation at TC=25°C, and DC current gain (hFE) ranging 40–240 depending on classification. It operates in linear switching mode with -1 V VCE(sat) at IC = -500 mA / IB = -50 mA.
For engineers reviewing the KSB546O datasheet, pinout, applications, or equivalent options, key selection considerations include high-voltage PNP switching capability, TO-220 package thermal performance, vertical deflection timing compliance, and complementarity to KSD401 in push-pull output designs.
Technical Context
The KSB546O implements a single PNP bipolar junction transistor structure optimized for high-voltage, medium-current linear amplification and switching in CRT TV deflection circuits. Its breakdown ratings (VCBO = -200 V, VCEO = -150 V) and safe operating area support sustained operation under reactive load conditions typical of vertical yoke drivers.
It delivers fT = 5 MHz at VCE = -10 V and IC = -0.4 A, enabling stable gain in low-frequency deflection timing waveforms. The device uses epitaxial base construction to ensure consistent hFE distribution across R/O/Y classifications and controlled saturation behavior under pulsed base drive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO | -200 V - Withstands reverse collector-base stress during flyback recovery in vertical deflection circuits |
| VCEO | -150 V - Maximum sustainable collector-emitter voltage under open-base condition in active region |
| IC (DC) | -2 A - Continuous collector current rating defining peak yoke current handling capability |
| PC (TC=25°C) | 25 W - Thermal power limit at case temperature; requires heatsink for sustained operation |
| hFE | 40–240 - Gain range per classification (R/O/Y); determines required base drive current for target IC |
| VCE(sat) | -1 V @ IC=-500 mA, IB=-50 mA - Low saturation voltage minimizes conduction loss in switching mode |
| fT | 5 MHz - Sufficient bandwidth for vertical scan frequency harmonics up to ~15 kHz fundamental |
Pinout & Package
Package: TO-220 (JEDEC variation AB), 3-lead through-hole, insulated back surface, intended for heatsink mounting with mechanical and thermal interface requirements per datasheet note A and F.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Left) | Base | Current-controlled input node; requires negative bias relative to emitter for turn-on |
| 2 (Center) | Collector | Main high-voltage current path; connected to yoke winding and flyback circuit |
| 3 (Right) | Emitter | Reference terminal for base drive and current return; typically tied to regulated supply rail |
Key Features
| Feature | Design Value |
|---|---|
| High VCBO rating | Supports robust flyback voltage margin in CRT vertical deflection without avalanche stress |
| TO-220 thermal design | Enables 25 W dissipation with standard heatsink; validated for continuous duty in TV chassis |
| Complementary pairing | Designed as direct PNP counterpart to KSD401 NPN for balanced push-pull yoke drivers |
| hFE classification bins | R/O/Y variants allow precise base drive sizing across production lots for consistent timing |
Applications
| TV Vertical Deflection Output | Industrial CRT Monitor Driver |
|---|---|
Use Scenario: Driving vertical deflection yoke in analog CRT televisions requiring precise 50/60 Hz sawtooth current waveform. IC Role / Device Role / Timing Role: PNP switching amplifier in series-pass configuration, modulating yoke current under sync-controlled base drive. Use Value: -150 V VCEO and -2 A IC rating ensure reliable operation across full vertical scan cycle including flyback overshoot. | Use Scenario: Power stage in legacy industrial CRT-based HMI displays used in control panels and test equipment. IC Role / Device Role / Timing Role: High-voltage PNP output switch delivering regulated vertical sweep current with low thermal drift. Use Value: TO-220 package and 25 W PC enable stable long-duration operation without derating in enclosed enclosures. |
| Legacy Broadcast Equipment | Video Signal Generator Output |
Use Scenario: Vertical timing generator in discontinued broadcast studio monitors and waveform analyzers. IC Role / Device Role / Timing Role: Linear amplifier stage shaping vertical ramp and clamp timing in composite video signal paths. Use Value: 5 MHz fT and controlled hFE distribution maintain waveform fidelity across temperature and unit variance. | Use Scenario: Output driver in benchtop video pattern generators producing calibrated CRT-compatible signals. IC Role / Device Role / Timing Role: Precision current source for vertical deflection coil, synchronized to internal timing reference. Use Value: -200 V VCBO provides headroom against transient spikes during pattern transitions and blanking intervals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP high-voltage power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJD47 | Lower VCBO (-100 V), TO-252 package, 15 W PC, hFE 30–120 | Not suitable for >100 V flyback circuits; limited to low-voltage deflection or general-purpose switching | Select only if vertical supply rail ≤80 V and thermal envelope allows surface-mount implementation |
| KSC2383Y | NPN polarity, +160 V VCEO, TO-220, 25 W PC, hFE 120–240 | Requires complementary circuit redesign; not drop-in replacement due to polarity inversion | Use only when redesigning push-pull stage with matched NPN/PNP pair and updated base drive logic |
Compared with MJD47 and KSC2383Y, the KSB546O remains uniquely suited for legacy CRT vertical output where -200 V VCBO, PNP polarity, and TO-220 mechanical compatibility are mandatory - neither alternative satisfies all three constraints simultaneously.
Availability
KSB546O is available at Aetrix Electronics and suitable for TV vertical deflection output, industrial CRT monitor driver, and legacy broadcast equipment requiring stable component supply despite end-of-life status.
Supply support for KSB546O 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 (formerly Fairchild Semiconductor) is a global supplier of energy-efficient semiconductor components, specializing in power management, analog, and discrete devices for industrial, automotive, and consumer markets.
The KSB546O belongs to ON Semiconductor's legacy high-voltage bipolar transistor product line, originally developed for CRT television deflection systems and maintained for backward compatibility in repair and maintenance channels.
FAQ
Is KSB546O still in active production?
No, the KSB546O is discontinued and not recommended for new designs per ON Semiconductor documentation dated May 2024. However, Aetrix Electronics maintains verified legacy stock with full traceability for repair, maintenance, and legacy system sustainment programs where functional replacement is impractical.
What is the pin configuration of KSB546O?
The KSB546O uses a standard TO-220 package with pin 1 = Base, pin 2 = Collector, pin 3 = Emitter (viewed from front with tab facing up and leads downward). This matches JEDEC TO-220 variation AB and is mechanically identical to KSD401 for complementary board layout.
Can KSB546O be replaced with an NPN transistor like KSD401?
No - KSD401 is an NPN complement, not a direct replacement. Swapping KSB546O with KSD401 would invert polarity and disrupt biasing in vertical deflection circuits. They are intended for use together in push-pull configurations, not as substitutes. The KSB546O must be replaced with a functionally matched PNP device.
What thermal management is required for KSB546O?
The KSB546O dissipates up to 25 W at TC = 25°C and requires a properly mounted heatsink with thermal interface material. Derating begins above 25°C case temperature per the published power derating curve; at 100°C TC, maximum allowable PC drops to ~12.5 W. Mounting torque and flatness per TO-220 spec are critical for reliability.
Does KSB546O have lead-free or RoHS-compliant variants?
Original KSB546O production predates mandatory RoHS compliance; no official lead-free variant was released by ON Semiconductor. Units supplied by Aetrix Electronics are legacy RoHS-exempt parts conforming to exemption 7a (high-melting-temperature solder) and documented per EU Directive 2011/65/EU Annex III.
KSB546O Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 2 A
- Voltage - Collector Emitter Breakdown (Max):
- 150 V
- Vce Saturation (Max) @ Ib, Ic:
- 1V @ 50mA, 500mA
- Current - Collector Cutoff (Max):
- 50µA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 70 @ 400mA, 10V
- Power - Max:
- 25 W
- Frequency - Transition:
- 5MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-3
KSB546O FAQ
1.How can I place an order for KSB546O through Aetrix?
Please submit a Request for Quotation (RFQ) for KSB546O 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 KSB546O reliable?
The price and inventory of KSB546O are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSB546O is usually 5 days.
3.What payment methods are accepted for KSB546O?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSB546O transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSB546O?
KSB546O orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSB546O 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 KSB546O?
For technical support, including KSB546O datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSB546O requirements.
6.How does Aetrix verify that KSB546O is sourced from the original manufacturer or authorized distributors?
All KSB546O 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 KSB546O meets industry standards.
7.What is the process for return or replacement of KSB546O?
All KSB546O units undergo pre-shipment inspection (PSI). If there is an issue with KSB546O, 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 KSB546O part is unused and in its original packaging.
Return procedure for KSB546O:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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