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onsemi KSB546YTU
- Part No.:
- KSB546YTU
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-220-3
- Datasheet:
-
KSB546YTU.pdf
- Description:
- TRANS PNP 150V 2A TO-220-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,502
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Product details
Overview
KSB546YTU from ON Semiconductor is a PNP epitaxial silicon power transistor designed for TV vertical deflection output stages, featuring -200 V collector-base voltage, -150 V collector-emitter voltage, -2 A DC collector current, 25 W collector dissipation at TC=25°C, and hFE range of 120–240 (Y-class). It operates in linear switching mode with -1 V VCE(sat) at IC = -500 mA/IB = -50 mA.
For engineers reviewing the KSB546YTU datasheet, pinout, applications, or equivalent options, key selection criteria include high-voltage PNP capability, TO-220 package thermal performance, vertical deflection timing compliance, and complementarity to KSD401 in push-pull output designs.
Technical Context
The KSB546YTU is engineered for high-voltage, medium-current linear amplification and switching in CRT TV vertical deflection circuits. Its -150 V BVCEO and -200 V BVCBO support flyback energy handling, while 5 MHz fT enables stable operation across line-scan harmonics.
Designed as a direct complement to the NPN KSD401, the KSB546YTU shares matching SOA curves and thermal derating profiles. Its Y-class hFE (120–240) ensures consistent drive margin in fixed-bias deflection stage configurations without external gain stabilization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO | -200 V - Withstands flyback voltage spikes in vertical deflection yoke circuits without breakdown |
| VCEO | -150 V - Sustains full vertical scan termination voltage under load |
| IC (DC) | -2 A - Delivers peak current for 60 Hz vertical sweep with margin |
| PC (TC=25°C) | 25 W - Enables heatsink-mounted operation in compact TV chassis |
| hFE (Y-class) | 120–240 - Ensures reliable base drive scaling across production lots |
| VCE(sat) | -1 V @ IC=-500 mA/IB=-50 mA - Minimizes conduction loss during active scan period |
| fT | 5 MHz - Supports stable gain up to 3rd harmonic of 60 Hz vertical frequency |
Pinout & Package
Package: TO-220 (JEDEC variation AB), single-ended through-hole, insulated tab, heatsink-mountable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Base) | Control input | Receives negative drive current to initiate conduction; requires current-limited bias network |
| 2 (Collector) | High-voltage output node | Connected to vertical yoke primary and flyback winding; referenced to negative rail |
| 3 (Emitter) | Power return path | Common emitter configuration ties to system ground or negative supply rail |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage PNP architecture | Enables complementary symmetry with KSD401 in Class-B vertical output stages |
| Y-class hFE binning | Guarantees minimum 120 hFE for predictable base drive sizing without test screening |
| TO-220 thermal interface | Supports 25 W dissipation with standard clip-on heatsink (RθJA ≈ 50°C/W typical) |
| Vertical deflection optimized SOA | Safe operating area validated for 60 Hz repetitive pulse stress with 1 ms on-time |
Applications
| TV Vertical Deflection Output | High-Voltage Linear Amplifier |
|---|---|
Use Scenario: Driving CRT yoke coil in analog television sets requiring precise 60 Hz sawtooth current waveform. IC Role / Device Role / Timing Role: PNP switch/amplifier in series-pass configuration controlling yoke current ramp and flyback recovery. Use Value: -150 V VCEO and 5 MHz fT ensure distortion-free vertical linearity and minimal phase shift across field rate. | Use Scenario: Regulated high-side current source in industrial HV bias supplies. IC Role / Device Role / Timing Role: Linear pass element delivering stable -2 A output with adjustable emitter degeneration. Use Value: 25 W PC rating and -200 V VCBO allow safe operation with >100 V headroom above load voltage. |
| Complementary Push-Pull Stage | Legacy Monitor Vertical Driver |
Use Scenario: Upper leg of Class-B output pair paired with KSD401 in legacy display electronics. IC Role / Device Role / Timing Role: High-side PNP partner providing symmetrical current sourcing/sinking capability. Use Value: Matched SOA and thermal coefficients with KSD401 reduce crossover distortion and thermal runaway risk. | Use Scenario: Vertical scan generator in monochrome or color computer monitors (e.g., VGA 640×480 @ 60 Hz). IC Role / Device Role / Timing Role: Primary vertical sweep amplifier driving deflection yoke and damper diode network. Use Value: -1 V VCE(sat) minimizes power loss during active trace, improving efficiency in fanless monitor enclosures. |
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 |
|---|---|---|---|
| KSB546YTA | Same die, TO-220AB package variant with non-insulated tab | Requires isolated mounting hardware when heatsink is grounded | Select KSB546YTA only if mechanical layout permits direct tab grounding |
| MJD47 | Lower VCEO (-100 V), higher hFE (75–220), TO-252 surface-mount | Not suitable for >100 V flyback; limited to low-power deflection or general-purpose switching | Choose MJD47 only for cost-sensitive, lower-voltage replacements where PCB rework is acceptable |
Compared with KSB546YTU, KSB546YTA offers identical electrical performance but different thermal interface requirements, while MJD47 trades voltage capability for surface-mount compatibility-neither is a drop-in replacement due to voltage rating or package mismatch.
Availability
KSB546YTU is available at Aetrix Electronics and suitable for legacy TV repair, CRT monitor refurbishment, and industrial high-voltage linear amplifier applications requiring stable component supply and long-term BOM continuity.
Supply support for KSB546YTU 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, sensor, and discrete devices for automotive, industrial, and consumer markets.
The KSB546YTU belongs to ON Semiconductor's legacy high-voltage bipolar transistor product line, developed specifically for analog video deflection and high-reliability linear power control applications in CRT-based systems.
FAQ
What is the pin configuration of the KSB546YTU?
The KSB546YTU uses a TO-220 package with pinout: Pin 1 = Base, Pin 2 = Collector, Pin 3 = Emitter. This configuration is standardized per JEDEC TO-220 variation AB and confirmed in the official ON Semiconductor datasheet Rev. 1 (May 2024). The KSB546YTU must be mounted with electrical isolation when the heatsink is grounded due to its insulated tab design.
Is the KSB546YTU still recommended for new designs?
No-the KSB546YTU is officially marked "DISCONTINUED" and "NOT RECOMMENDED FOR NEW DESIGN" by ON Semiconductor. While available for legacy repair and maintenance, new projects should consider modern alternatives with improved efficiency, RoHS compliance, and active support. The KSB546YTU remains viable only where exact form-fit-function replacement is required for field service.
What is the hFE classification for KSB546YTU?
The KSB546YTU is Y-classified, meaning its DC current gain (hFE) is guaranteed between 120 and 240 when measured at VCE = -10 V and IE = -0.4 A. This binning ensures sufficient drive margin in vertical deflection circuits without requiring external feedback or gain compensation networks in the KSB546YTU design.
How does the KSB546YTU compare to KSD401?
The KSB546YTU is the designated PNP complement to the NPN KSD401. They share matched voltage ratings, SOA curves, and thermal characteristics, enabling balanced push-pull operation in vertical deflection stages. Unlike the KSD401, the KSB546YTU features a Y-class hFE bin and insulated TO-220 tab-critical for symmetric biasing and thermal management in the KSB546YTU/KSD401 pair.
What is the maximum allowable junction temperature for KSB546YTU?
The KSB546YTU has a maximum rated junction temperature (TJ) of 150°C, as specified in the Absolute Maximum Ratings table. Operation beyond this limit risks permanent degradation of the epitaxial base-collector junction. Derating is required above TC = 25°C per the published power derating curve, with zero dissipation at ~100°C case temperature-this thermal behavior is integral to safe KSB546YTU deployment in enclosed TV chassis.
KSB546YTU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- 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:
- 120 @ 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
KSB546YTU FAQ
1.How can I place an order for KSB546YTU through Aetrix?
Please submit a Request for Quotation (RFQ) for KSB546YTU 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 KSB546YTU reliable?
The price and inventory of KSB546YTU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSB546YTU is usually 5 days.
3.What payment methods are accepted for KSB546YTU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSB546YTU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSB546YTU?
KSB546YTU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSB546YTU 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 KSB546YTU?
For technical support, including KSB546YTU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSB546YTU requirements.
6.How does Aetrix verify that KSB546YTU is sourced from the original manufacturer or authorized distributors?
All KSB546YTU 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 KSB546YTU meets industry standards.
7.What is the process for return or replacement of KSB546YTU?
All KSB546YTU units undergo pre-shipment inspection (PSI). If there is an issue with KSB546YTU, 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 KSB546YTU part is unused and in its original packaging.
Return procedure for KSB546YTU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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