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onsemi KSD5041QTA
- Part No.:
- KSD5041QTA
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
KSD5041QTA.pdf
- Description:
- TRANS NPN 20V 5A TO-92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,083
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Product details
Overview
KSD5041QTA from ON Semiconductor (formerly Fairchild) is an NPN epitaxial silicon transistor optimized for AF output amplifier stages in electronic flash units. It delivers low 1 V collector-emitter saturation voltage at IC = 3 A / IB = 0.1 A, supports 20 V collector-emitter breakdown, handles 5 A continuous collector current, and operates up to 150 °C junction temperature.
For engineers reviewing the KSD5041QTA datasheet, pinout, applications, or equivalent options, key selection criteria include its TO-92 package compatibility, high DC current gain (hFE = 180–600), low VCE(sat), 150 MHz fT bandwidth, and suitability for pulsed high-current switching in compact flash circuits.
Technical Context
This device is a general-purpose power NPN transistor with epitaxial base construction enabling stable gain and fast switching. Its design targets low-voltage, high-current pulse amplification where minimal saturation loss and thermal robustness are critical.
The KSD5041QTA operates with a 7 V emitter-base breakdown rating and exhibits only 0.1 μA collector cut-off current at VCB = 10 V, supporting reliable turn-off in saturated-switching configurations. Its 166.6 °C/W junction-to-ambient thermal resistance reflects standard TO-92 thermal performance under defined PCB conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO | 40 V - Maximum reverse bias voltage the collector-base junction can withstand without breakdown |
| VCEO | 20 V - Maximum collector-emitter voltage before avalanche conduction occurs at IC = 1 mA |
| IC | 5 A - Continuous DC collector current capability under specified thermal conditions |
| VCE(sat) | 1 V @ IC = 3 A, IB = 0.1 A - Low on-state voltage drop enabling high efficiency in saturated switch mode |
| fT | 150 MHz - Current gain bandwidth product indicating usable frequency range for small-signal amplification |
| hFE | 180–600 - DC current gain range across classification bins (P/O/R), defining base drive requirements |
| PD | 0.75 W @ TA = 25°C - Maximum steady-state power dissipation at ambient temperature |
Pinout & Package
Package: TO-92 3L molded plastic case with straight or bent leads; standardized 0.2-inch lead spacing; compatible with through-hole PCB assembly and ammo packing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current exit path from transistor | Connected to ground or low-side return; polarity defines NPN operation |
| 2 (Collector) | Current entry path into transistor | Drives load (e.g., flash capacitor discharge path); handles peak pulsed currents up to 5 A |
| 3 (Base) | Control terminal for current amplification | Receives drive signal to enable saturation; requires ~0.1 A base current for full 3 A collector conduction |
Key Features
| Feature | Design Value |
|---|---|
| AF Output Amplifier Targeting | Optimized for audio-frequency pulse amplification in electronic flash units, not general-purpose linear amplification |
| Low VCE(sat) | 1 V at high current (IC = 3 A), minimizing power loss and heat generation during flash discharge |
| High hFE Range | 180–600 across P/O/R bins, allowing flexible base drive design and tolerance to process variation |
| Robust Thermal Rating | 150 °C maximum junction temperature and 166.6 °C/W RθJA, supporting operation in thermally constrained flash modules |
Applications
| Electronic Flash Unit Driver | DC-DC Converter Switch |
|---|---|
Use Scenario: Rapid discharge of high-voltage flash capacitors in camera strobes and portable lighting systems. IC Role / Device Role / Timing Role: High-current saturated switch controlling flash tube current path. Use Value: 1 V VCE(sat) reduces conduction loss and improves flash energy transfer efficiency vs. higher-saturation alternatives. | Use Scenario: Low-voltage, medium-current switching stage in isolated or non-isolated buck/boost converters for battery-powered devices. IC Role / Device Role / Timing Role: Power switch operating in hard-switched PWM mode at ≤100 kHz. Use Value: 5 A IC rating and 150 MHz fT support efficient switching at moderate frequencies with minimal gate drive overhead. |
| Automotive Interior Lighting Control | Industrial Solenoid Driver |
Use Scenario: Pulse-width modulated control of LED arrays or incandescent lamps in vehicle cabin lighting. IC Role / Device Role / Timing Role: Low-side driver switching 2–4 A loads at 100–500 Hz PWM rates. Use Value: TO-92 package enables compact placement near LEDs; 150 °C TJ rating accommodates under-dash thermal environments. | Use Scenario: Driving 24 V solenoids in factory automation valves and pneumatic actuators. IC Role / Device Role / Timing Role: Saturated switch interfacing microcontroller GPIO to inductive load. Use Value: 20 V VCEO safely covers 24 V system transients; 0.1 μA ICBO ensures reliable off-state blocking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJD127G | TO-220 package, higher PD (1.5 W), VCEO = 100 V, hFE = 30–250 | Designed for higher-voltage linear and switching regulators; unsuitable for space-constrained flash modules | Select when higher voltage margin and thermal mass are required; not a drop-in replacement due to package and gain differences |
| KSC1845FTA | TO-92 package, lower IC = 2 A, VCEO = 12 V, hFE = 70–240 | Targeted at low-power AF amplifiers and pre-driver stages; insufficient for 3 A flash discharge | Consider only for lower-current auxiliary functions; KSD5041QTA provides 2.5× higher current and 67% higher VCEO |
Compared with MJD127G and KSC1845FTA, the KSD5041QTA uniquely balances TO-92 form factor, 5 A current handling, 20 V breakdown, and low 1 V saturation-making it specifically fit for compact, high-pulse-current flash drivers where thermal and board-space constraints dominate.
Availability
KSD5041QTA is available at Aetrix Electronics and suitable for electronic flash units, DC-DC converter switches, automotive interior lighting control, and industrial solenoid drivers requiring stable component supply and consistent TO-92 sourcing.
Supply support for KSD5041QTA 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, sensors, and discrete devices.
The KSD5041QTA belongs to Fairchild's legacy NPN power transistor family, engineered for high-reliability pulsed switching in consumer imaging and industrial control applications where low saturation voltage and robust thermal behavior are essential.
FAQ
What is the maximum collector current rating for the KSD5041QTA?
The KSD5041QTA has an absolute maximum collector current (IC) rating of 5 A. This value is specified under continuous DC conditions at TA = 25°C and must be derated above that temperature. In practical flash applications, the device typically handles short-duration pulses up to this limit, supported by its 0.75 W power dissipation rating and 166.6 °C/W thermal resistance. Always verify actual thermal margins using measured board conditions for your KSD5041QTA implementation.
Does the KSD5041QTA have a documented pinout configuration for TO-92?
Yes, the KSD5041QTA uses the standard TO-92 3L pinout: Pin 1 is Emitter, Pin 2 is Collector, and Pin 3 is Base - confirmed in the official Fairchild KSD5041 Rev. 1.5 datasheet, Figure 9. This configuration applies to both straight-lead and bent-lead variants. The KSD5041QTA top mark "D5041" aligns with this pin assignment, and no alternate pinouts are documented for this part number.
What is the typical DC current gain (hFE) range for the KSD5041QTA?
The KSD5041QTA offers three hFE classification bins: P (180–270), O (230–380), and R (340–600), all tested at VCE = 2 V and IC = 0.5 A. The specific bin is marked on the device (e.g., "D5041" does not encode bin; binning is internal). For design purposes, the full 180–600 range must be accommodated in base drive circuitry. The KSD5041QTA's hFE remains ≥150 even at IC = 2 A, ensuring usable gain under high-current switching conditions.
Can the KSD5041QTA be used in automotive applications?
No - the KSD5041QTA is not qualified for automotive use. Per the original Fairchild documentation, it is designated as a commercial-grade device with no AEC-Q101 qualification or extended temperature grade. Its 150 °C max junction temperature and TO-92 package do not meet automotive reliability or thermal cycling requirements. Use only in consumer, industrial, or medical non-critical applications; never in safety-critical or transportation systems without explicit written approval from ON Semiconductor.
What is the collector-emitter saturation voltage (VCE(sat)) specification for the KSD5041QTA?
The KSD5041QTA specifies VCE(sat) ≤ 1 V at IC = 3 A and IB = 0.1 A, measured at TA = 25°C. This low saturation voltage directly reduces conduction losses during high-current flash discharge cycles. The value is guaranteed across the full operating temperature range and supports efficient energy transfer from storage capacitors to flash tubes. Designers should reference this exact test condition when sizing base drive for the KSD5041QTA to ensure full saturation.
KSD5041QTA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 5 A
- Voltage - Collector Emitter Breakdown (Max):
- 20 V
- Vce Saturation (Max) @ Ib, Ic:
- 1V @ 100mA, 3A
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 230 @ 500mA, 2V
- Power - Max:
- 750 mW
- Frequency - Transition:
- 150MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
KSD5041QTA FAQ
1.How can I place an order for KSD5041QTA through Aetrix?
Please submit a Request for Quotation (RFQ) for KSD5041QTA 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 KSD5041QTA reliable?
The price and inventory of KSD5041QTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSD5041QTA is usually 5 days.
3.What payment methods are accepted for KSD5041QTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSD5041QTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSD5041QTA?
KSD5041QTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSD5041QTA 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 KSD5041QTA?
For technical support, including KSD5041QTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSD5041QTA requirements.
6.How does Aetrix verify that KSD5041QTA is sourced from the original manufacturer or authorized distributors?
All KSD5041QTA 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 KSD5041QTA meets industry standards.
7.What is the process for return or replacement of KSD5041QTA?
All KSD5041QTA units undergo pre-shipment inspection (PSI). If there is an issue with KSD5041QTA, 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 KSD5041QTA part is unused and in its original packaging.
Return procedure for KSD5041QTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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