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onsemi KSC1008COTA
- Part No.:
- KSC1008COTA
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
KSC1008COTA.pdf
- Description:
- TRANS NPN 60V 0.7A TO-92-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,077
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Product details
Overview
KSC1008COTA from onsemi is an NPN epitaxial silicon transistor designed for low-frequency amplification and medium-speed switching, with VCBO = 80 V, IC = 700 mA, and fT = 30–50 MHz. It features center-collector pinout (Emitter–Collector–Base), TO-92-3 LF package, and Pb-free construction, commonly used in audio preamplifier stages and relay driver circuits.
For engineers reviewing the KSC1008COTA datasheet, pinout, applications, or equivalent options, key selection criteria include its 60 V VCEO rating, hFE classification (Y-grade: 120–240), saturation voltage performance (VCE(sat) = 0.2–0.4 V at IC = 500 mA), and thermal resistance of 156 °C/W in standard FR-4 PCB layout.
Technical Context
This discrete NPN bipolar junction transistor operates with fixed-base biasing or emitter-follower configurations in linear and saturated modes. Its 80 V VCBO and 60 V VCEO support use in 48 V rail interfaces and inductive load switching where transient voltage margin is critical.
The device delivers DC current gain (hFE) ranging 120–240 under VCE = 2 V and IC = 50 mA, and exhibits Cob = 8 pF at VCB = 10 V - enabling stable operation in sub-50 MHz signal paths without unintended resonance or bandwidth collapse.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO | 80 V - supports collector-base reverse bias up to 80 V, suitable for flyback clamp and inductive snubber circuits |
| VCEO | 60 V - maximum safe collector-emitter voltage under open-base condition, defines usable supply headroom |
| IC | 700 mA - continuous collector current rating, sets upper limit for load-driving capability |
| fT | 30–50 MHz - usable small-signal bandwidth for low-frequency amplifier and switching applications |
| RθJA | 156 °C/W - thermal resistance on standard FR-4 PCB (76 mm × 114 mm), determines max power dissipation at ambient |
| hFE (Y-class) | 120–240 - guaranteed DC current gain range at VCE = 2 V, IC = 50 mA, enables predictable bias design |
| VCE(sat) | 0.2–0.4 V @ IC = 500 mA, IB = 50 mA - low saturation voltage minimizes conduction loss in switching mode |
Pinout & Package
Package: TO-92-3 LF (Case 135AR), Pb-free, through-hole mounting with 0.200" inline lead spacing (tape-and-reel format).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Emitter | Current sink terminal; connects to ground or low-side reference in common-emitter configuration |
| 2 | Collector | Current source terminal; ties to load or positive rail in switching or amplification topologies |
| 3 | Base | Control input; requires current-limited drive (e.g., via series resistor) to achieve target IC |
Key Features
| Feature | Design Value |
|---|---|
| Center-collector pinout (suffix "C") | Pin 1 = Emitter, Pin 2 = Collector, Pin 3 = Base - simplifies PCB layout symmetry vs. side-collector variants |
| Y-class hFE binning | Guaranteed 120–240 hFE at test conditions - reduces gain variation across production batches |
| Pb-free construction | RoHS-compliant materials and plating - meets environmental compliance for industrial and consumer end equipment |
| TO-92-3 LR tape-and-reel packaging | 2000 units per fan-fold reel, 0.200" pitch - optimized for automated through-hole insertion |
Applications
| Audio Preamp Stage | Relay Driver Circuit |
|---|---|
Use Scenario: Low-noise voltage amplification of microphone or line-level signals before ADC sampling. IC Role / Device Role / Timing Role: NPN BJT configured in common-emitter topology with emitter degeneration for stable gain and linearity. Use Value: 120–240 hFE ensures consistent small-signal β across units; 8 pF Cob avoids high-frequency roll-off below 20 kHz. | Use Scenario: Driving 12 V/24 V electromagnetic relays in PLC I/O modules and industrial control panels. IC Role / Device Role / Timing Role: Medium-speed saturated switch controlling relay coil current up to 500 mA. Use Value: VCE(sat) ≤ 0.4 V at 500 mA limits power loss to < 200 mW; 60 V VCEO accommodates relay back-EMF spikes. |
| DC Motor Speed Control | LED Current Regulator |
Use Scenario: PWM-based speed regulation of small brushed DC motors in HVAC actuators and office equipment. IC Role / Device Role / Timing Role: Switching transistor in low-side drive configuration, toggled at ≤ 20 kHz. Use Value: fT ≥ 30 MHz ensures clean edge response; 700 mA IC rating supports motors drawing up to 600 mA peak. | Use Scenario: Constant-current LED driver for status indicators and backlight segments in embedded HMI panels. IC Role / Device Role / Timing Role: Linear current regulator using emitter-resistor feedback in common-collector configuration. Use Value: Tight hFE binning (Y-class) enables accurate current setting; 800 mW PD allows 20 mA × 12 V operation with margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN general-purpose transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC547C | Lower VCBO (50 V), lower IC (100 mA), TO-92 package but side-collector pinout (E-B-C) | Not suitable for >50 V or >100 mA loads; limited to low-power signal switching | Select only for cost-sensitive, low-voltage logic-level interfacing where KSC1008COTA's voltage/current headroom is unnecessary |
| KSC1845YTA | Higher fT (150 MHz), same TO-92-3 LR package and Y-grade hFE, but VCBO = 120 V and IC = 500 mA | Better for RF-coupled preamps or faster switching; lower current rating restricts high-load drivers | Prefer when bandwidth >100 MHz is required and load current stays ≤500 mA; verify layout compatibility with identical footprint |
Compared with BC547C and KSC1845YTA, the KSC1008COTA uniquely balances 60 V VCEO, 700 mA IC, and Y-grade hFE in a center-collector TO-92-3 LR package - making it optimal for industrial relay drivers and mid-power audio stages where both voltage margin and current drive matter.
Availability
KSC1008COTA is available at Aetrix Electronics and suitable for audio preamplifiers, relay driver circuits, DC motor controllers, and LED current regulators requiring stable component supply and RoHS-compliant through-hole transistors.
Supply support for KSC1008COTA 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 focused on energy-efficient electronics, delivering power, analog, sensor, and connectivity solutions.
The KSC1008COTA belongs to onsemi's general-purpose bipolar transistor product line, engineered for reliability in industrial control, consumer audio, and electromechanical interface applications.
FAQ
What is the pin configuration of the KSC1008COTA?
The KSC1008COTA uses a center-collector TO-92-3 pinout: Pin 1 is Emitter, Pin 2 is Collector, and Pin 3 is Base. This differs from non-"C" variants (e.g., KSC1008OBU), which use side-collector (E-B-C) arrangement. The marking "C1008 YC" on the package confirms the center-collector and Y-grade hFE binning. Always verify orientation using the flat side and lead-down view per onsemi Case 135AR mechanical drawing.
What does the "Y" in KSC1008COTA signify?
The "Y" in KSC1008COTA denotes the hFE classification bin: guaranteed DC current gain of 120–240 at VCE = 2 V and IC = 50 mA. This tighter gain range improves consistency in bias-critical designs like linear amplifiers or precision current sources. The "C" confirms center-collector pinout, and "TA" indicates tape-and-reel packaging with 0.200" lead spacing - all verified in onsemi's KSC1008/D datasheet Rev. 3.
Can the KSC1008COTA replace the KSC1008YTA?
No - KSC1008COTA and KSC1008YTA are not interchangeable. KSC1008COTA has center-collector pinout (E-C-B), while KSC1008YTA uses side-collector (E-B-C). Swapping them without PCB revision causes incorrect biasing and circuit failure. Both share Y-grade hFE and TO-92-3 LR packaging, but pinout mismatch makes them functionally incompatible despite identical marking prefix and packaging format.
What is the maximum power dissipation of the KSC1008COTA under standard conditions?
The KSC1008COTA has a rated power dissipation (PD) of 800 mW at TA = 25°C, derating linearly by 6.4 mW/°C above that temperature. On a standard FR-4 PCB (76 mm × 114 mm), its RθJA is 156 °C/W - meaning junction temperature rises ~125°C above ambient at full 800 mW. For reliable long-term operation, keep steady-state PD ≤ 500 mW or implement heatsinking if ambient exceeds 50°C. This value is specified in the Thermal Characteristics table of the official KSC1008/D datasheet.
Is the KSC1008COTA suitable for switching 24 V inductive loads?
Yes - the KSC1008COTA supports 24 V inductive load switching with appropriate protection. Its VCEO = 60 V provides sufficient margin against back-EMF spikes (typically ≤2× supply), and IC = 700 mA handles typical relay or solenoid coils. Use a flyback diode (e.g., 1N4007) across the load and ensure base drive delivers ≥50 mA to achieve full saturation (VCE(sat) ≤ 0.4 V). Confirm layout thermal relief per onsemi's recommended land pattern to avoid junction overheating during repetitive switching.
KSC1008COTA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 700 mA
- Voltage - Collector Emitter Breakdown (Max):
- 60 V
- Vce Saturation (Max) @ Ib, Ic:
- 400mV @ 50mA, 500mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 70 @ 50mA, 2V
- Power - Max:
- 800 mW
- Frequency - Transition:
- 50MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
KSC1008COTA FAQ
1.How can I place an order for KSC1008COTA through Aetrix?
Please submit a Request for Quotation (RFQ) for KSC1008COTA 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 KSC1008COTA reliable?
The price and inventory of KSC1008COTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSC1008COTA is usually 5 days.
3.What payment methods are accepted for KSC1008COTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSC1008COTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSC1008COTA?
KSC1008COTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSC1008COTA 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 KSC1008COTA?
For technical support, including KSC1008COTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSC1008COTA requirements.
6.How does Aetrix verify that KSC1008COTA is sourced from the original manufacturer or authorized distributors?
All KSC1008COTA 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 KSC1008COTA meets industry standards.
7.What is the process for return or replacement of KSC1008COTA?
All KSC1008COTA units undergo pre-shipment inspection (PSI). If there is an issue with KSC1008COTA, 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 KSC1008COTA part is unused and in its original packaging.
Return procedure for KSC1008COTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
KSC1008COTA Tags
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