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onsemi KSC3503DS
- Part No.:
- KSC3503DS
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-225AA, TO-126-3
- Datasheet:
-
KSC3503DS.pdf
- Description:
- TRANS NPN 300V 0.1A TO-126-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,088
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Product details
Overview
KSC3503DS from onsemi is an NPN epitaxial silicon transistor designed for high-voltage audio and video amplifier stages, featuring VCEO = 300 V, fT = 150 MHz, Cob = 2.6 pF (typ), IC = 100 mA DC, and hFE = 60–120 at VCE = 10 V, IC = 10 mA - deployed in CRT video output and low-THD voltage amplification circuits.
For engineers reviewing the KSC3503DS datasheet, pinout, applications, or equivalent options, key selection criteria include high-voltage breakdown margin, gain linearity at audio frequencies, thermal resistance (RθJC = 17.8°C/W), TO-126-3LD package compatibility, and complementarity with KSA1381 for push-pull designs.
Technical Context
This NPN transistor operates in linear amplification mode with verified gain bandwidth product of 150 MHz under VCE = 30 V, IC = 10 mA conditions, and exhibits low reverse transfer capacitance (Cre = 1.8 pF at VCB = 30 V) to minimize Miller effect in high-frequency gain stages.
Its absolute maximum ratings support sustained operation up to 300 V collector-base and collector-emitter, with safe operating area validated for pulse currents up to 200 mA and DC dissipation of 7 W at TC = 25°C - derated linearly to 1.2 W at TC = 125°C per RθJC = 17.8°C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 300 V - enables use in CRT anode drive and high-voltage audio output without breakdown risk |
| fT | 150 MHz - supports stable small-signal amplification up to VHF band in video driver applications |
| Cob | 2.6 pF (typ) - limits high-frequency loading and improves stability in tuned amplifier stages |
| hFE | 60–120 - provides predictable current gain across production lots for bias-critical amplifier designs |
| RθJC | 17.8°C/W - allows direct heatsinking to chassis for thermal management in compact video output modules |
| VBE(sat) | 1.0 V (max) at IC = 20 mA, IB = 2 mA - ensures reliable turn-on margin in Class-A/B driver configurations |
| PC (TC = 25°C) | 7 W - supports continuous power delivery in discrete video output stage without forced cooling |
Pinout & Package
Package: TO-126-3LD (Case 340AS), surface-mount compatible with through-hole mounting, 3-pin plastic power package with emitter-collector-base terminal layout and integral heat slug.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current sink node | Connected to ground or low-impedance return path; carries full load current in common-emitter configuration |
| 2 (Collector) | High-voltage output node | Drives load (e.g., CRT deflection coil or audio transformer primary); rated for 300 V standoff |
| 3 (Base) | Control input node | Receives bias current to regulate collector current; requires external resistor network for stable DC operating point |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage capability | VCEO = VCBO = 300 V - eliminates need for series-connected transistors in CRT flyback and HV amplifier stages |
| Low-output capacitance | Cob = 2.6 pF - reduces frequency-dependent phase shift and improves transient response in video amplifiers |
| Gain linearity | Verified THD performance across IC range - maintains fidelity in analog audio preamp and voltage amplifier roles |
| Thermal robustness | RθJC = 17.8°C/W + 150°C max junction temperature - supports operation in sealed industrial video enclosures |
| Pb-free & RoHS | Compliant with EU Directive 2011/65/EU - meets environmental requirements for consumer and broadcast equipment |
Applications
| Audio Voltage Amplifier | CRT Video Output Stage |
|---|---|
Use Scenario: Low-distortion preamplifier for studio-grade analog audio signal chain before DAC or power stage. IC Role / Device Role / Timing Role: NPN voltage amplifier with fixed-bias common-emitter topology delivering 20 dB gain at 20 kHz. Use Value: hFE linearity and low Cob preserve harmonic integrity below 0.05% THD at 1 kHz, 10 Vpp. | Use Scenario: Horizontal deflection output driver in analog CRT monitors and legacy test equipment. IC Role / Device Role / Timing Role: Switching amplifier driving flyback transformer primary with 15.734 kHz retrace pulses. Use Value: 300 V VCEO withstands flyback spikes; 150 MHz fT ensures clean edge fidelity during scan-line transitions. |
| General-Purpose Linear Amplifier | Current Source for Analog Circuits |
Use Scenario: Fixed-gain buffer in instrumentation front-end requiring stable DC bias and AC coupling. IC Role / Device Role / Timing Role: Common-emitter amplifier with emitter degeneration resistor for gain stabilization. Use Value: hFE min/max spread (60–120) accommodated by feedback design; 7 W PC supports 500 mW continuous output. | Use Scenario: Constant-current sink for LED biasing or active load in differential pair amplifiers. IC Role / Device Role / Timing Role: Emitter-follower configured current source with base voltage reference and emitter resistor. Use Value: VBE(sat) = 1.0 V (max) enables precise current setting with <1% error over temperature when paired with 1% tolerance resistor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN high-voltage amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| KSC3502DS | VCEO = 200 V (lower), fT = 120 MHz, same TO-126-3LD package and pinout | Not suitable for >200 V CRT anode drive; acceptable for mid-voltage audio stages | Select KSC3502DS only if system voltage remains ≤200 V and bandwidth margin ≥120 MHz suffices |
| MJE13005 | VCEO = 400 V (higher), IC = 1.5 A (higher), TO-220 package, different pinout (E-C-B vs E-B-C) | Requires PCB layout change; overqualified for 100 mA video output but preferred for higher-power flyback drivers | Choose MJE13005 only when upgrading thermal capacity or voltage headroom beyond 300 V is required |
Compared with KSC3503DS, KSC3502DS offers reduced voltage rating but identical footprint and gain behavior, while MJE13005 delivers higher voltage and current at the cost of mechanical redesign and increased drive requirements.
Availability
KSC3503DS is available at Aetrix Electronics and suitable for CRT display systems, analog audio amplifiers, and general-purpose linear amplifier designs requiring stable component supply, long-lifecycle availability, and Pb-free compliance.
Supply support for KSC3503DS 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensor, and logic solutions for automotive, industrial, and consumer markets.
The KSC3503DS belongs to onsemi's high-voltage bipolar transistor product line, engineered specifically for analog video output, CRT deflection, and low-THD audio amplification where ruggedness and gain consistency are critical.
FAQ
What is the maximum collector-emitter voltage rating for KSC3503DS?
The KSC3503DS has a guaranteed minimum collector-emitter breakdown voltage (BVCEO) of 300 V at IC = 1 mA and IB = 0. This rating is confirmed in the Absolute Maximum Ratings table and Electrical Characteristics section of the official onsemi datasheet (Rev. 3, April 2025). Operation above this voltage risks irreversible device failure.
Does KSC3503DS have a complementary PNP transistor?
Yes, the KSC3503DS is explicitly documented as complementary to the KSA1381 PNP transistor in the Features section of the onsemi datasheet. Both devices share matched voltage ratings, gain characteristics, and TO-126-3LD packaging - enabling balanced push-pull amplifier designs without thermal or electrical mismatch.
What is the thermal resistance from junction to case for KSC3503DS?
The KSC3503DS has a thermal resistance from junction to case (RθJC) of 17.8°C/W, measured under standard mounting conditions on minimum pad size (Note 1, Thermal Characteristics table). This value enables accurate heatsink sizing when dissipating up to 7 W at TC = 25°C.
Is KSC3503DS RoHS compliant and lead-free?
Yes, the KSC3503DS is explicitly stated as Pb-free and RoHS compliant in the Features section of the onsemi datasheet. It meets EU Directive 2011/65/EU requirements and is manufactured using lead-free plating and molding compounds - verified via onsemi's material declarations and compliance documentation.
What package type does KSC3503DS use and how are its pins arranged?
The KSC3503DS uses the TO-126-3LD package (Case 340AS), a 3-pin plastic power package with integrated heat slug. Pin 1 is Emitter, Pin 2 is Collector, and Pin 3 is Base - confirmed by the Marking Diagram and Ordering Information sections of the official datasheet. The flat side of the package faces the user with leads downward.
KSC3503DS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-225AA, TO-126-3
- Packaging:
- Bulk
- Product Status:
- Last Time Buy
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 100 mA
- Voltage - Collector Emitter Breakdown (Max):
- 300 V
- Vce Saturation (Max) @ Ib, Ic:
- 600mV @ 2mA, 20mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 60 @ 10mA, 10V
- Power - Max:
- 7 W
- Frequency - Transition:
- 150MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-126-3
KSC3503DS FAQ
1.How can I place an order for KSC3503DS through Aetrix?
Please submit a Request for Quotation (RFQ) for KSC3503DS 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 KSC3503DS reliable?
The price and inventory of KSC3503DS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSC3503DS is usually 5 days.
3.What payment methods are accepted for KSC3503DS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSC3503DS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSC3503DS?
KSC3503DS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSC3503DS 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 KSC3503DS?
For technical support, including KSC3503DS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSC3503DS requirements.
6.How does Aetrix verify that KSC3503DS is sourced from the original manufacturer or authorized distributors?
All KSC3503DS 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 KSC3503DS meets industry standards.
7.What is the process for return or replacement of KSC3503DS?
All KSC3503DS units undergo pre-shipment inspection (PSI). If there is an issue with KSC3503DS, 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 KSC3503DS part is unused and in its original packaging.
Return procedure for KSC3503DS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
KSC3503DS Tags
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MMBT3906LT1G
onsemi
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MMBT3904-7-F
Diodes Incorporated
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MMBT3904LT1G
onsemi
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MMBT3906-7-F
Diodes Incorporated
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MMBT3904-TP
Micro Commercial Co
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MMBT2222A-7-F
Diodes Incorporated
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BC846BLT1G
onsemi
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BC847B,215
Nexperia USA Inc.
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SMMBT3904LT1G
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MMBT2222A-TP
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MMBTA06LT1G
onsemi
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MMBT2222ALT1G
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