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onsemi KSC2331YTA
- Part No.:
- KSC2331YTA
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 Long Body, Formed Leads
- Datasheet:
-
KSC2331YTA.pdf
- Description:
- TRANS NPN 60V 0.7A TO-92-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,745
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Product details
Overview
KSC2331YTA from ON Semiconductor (formerly Fairchild) is an NPN epitaxial silicon transistor designed for low-frequency amplification and medium-speed switching in discrete power control circuits. It delivers 700 mA collector current, 80 V collector-base breakdown voltage, and 1 W power dissipation in TO-92L package - commonly used in relay drivers, LED drivers, and linear regulator pass elements.
For engineers reviewing the KSC2331YTA datasheet, pinout, applications, or equivalent options, key selection criteria include hFE classification (Y = 120–240), VCE(sat) ≤ 0.7 V at IC = 500 mA/IB = 50 mA, fT ≥ 30 MHz, and thermal resistance of 125 °C/W under standard FR-4 PCB conditions.
Technical Context
This device operates as a general-purpose bipolar junction transistor with fixed-emitter configuration and DC-coupled gain control. Its 150 °C maximum junction temperature and -55 to +150 °C storage range support industrial ambient operation, while the 8 pF output capacitance and 30–50 MHz fT enable stable performance up to mid-audio frequencies.
The KSC2331YTA exhibits defined saturation behavior: VCE(sat) = 0.2–0.7 V and VBE(sat) = 0.86–1.20 V under IC = 500 mA/IB = 50 mA, enabling predictable switching loss estimation. Its complement, KSA931 (PNP), shares matching voltage ratings and thermal characteristics for push-pull stage design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO | 80 V - supports collector bias up to 80 V without breakdown, suitable for 48 V supply rail interfaces |
| IC | 700 mA - enables direct drive of small relays, solenoids, or LED strings without external buffering |
| hFE (Y-class) | 120–240 - ensures consistent current amplification across production lots for reliable base drive sizing |
| VCE(sat) | 0.2–0.7 V @ IC = 500 mA - limits conduction loss to ≤350 mW in saturated switch mode |
| fT | 30–50 MHz - permits use in audio preamplifiers and PWM signal conditioning up to ~1 MHz |
| RθJA | 125 °C/W - requires minimum 76 mm × 114 mm FR-4 copper area for full 1 W dissipation at TA = 25 °C |
Pinout & Package
Package: TO-92L (3-lead plastic through-hole), standardized lead spacing and body dimensions per JEDEC TO-92 variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current sink terminal | Connected to ground or low-side return path; defines reference for VBE and VCE |
| 2 (Collector) | Current source terminal | Drives load toward positive rail; withstands up to 80 V reverse bias relative to base |
| 3 (Base) | Control input terminal | Receives current-limited drive (e.g., via resistor from MCU GPIO); controls IC proportionally to IB |
Key Features
| Feature | Design Value |
|---|---|
| Low-frequency amplifier capability | Stable hFE > 120 up to 100 kHz with minimal phase shift, supporting analog sensor signal conditioning |
| Medium-speed switching | Turn-on/off times < 1 μs at IC = 100 mA, enabling 500 kHz PWM duty-cycle control |
| Complement to KSA931 | Matched VCBO (80 V), VCEO (60 V), and hFE ranges allow symmetrical push-pull output stages |
| High VCEO rating | 60 V collector-emitter breakdown supports 24–48 V industrial bus applications with margin |
Applications
| Relay Driver Circuit | LED Constant-Current Sink |
|---|---|
Use Scenario: Driving 12 V/400 mA electromagnetic relay coil from microcontroller GPIO. IC Role / Device Role / Timing Role: NPN switch operating in saturation mode to close relay contacts. Use Value: Low VCE(sat) ≤ 0.7 V minimizes power loss (≤350 mW) and eliminates need for heat sinking. | Use Scenario: Sinking current from high-brightness white LEDs in automotive interior lighting. IC Role / Device Role / Timing Role: Linear current regulator using emitter-resistor feedback. Use Value: Tight hFE tolerance (120–240) enables ±5% LED current accuracy without trimming. |
| DC Motor Speed Control | Linear Voltage Regulator Pass Element |
Use Scenario: Pulse-width modulated control of 24 V/300 mA brushed DC fan motor. IC Role / Device Role / Timing Role: Low-side switch modulating average motor voltage. Use Value: fT ≥ 30 MHz ensures clean switching edges at 20 kHz PWM frequency with minimal overshoot. | Use Scenario: Pass transistor in 5 V/500 mA linear regulator supplying analog sensor circuitry. IC Role / Device Role / Timing Role: Series pass element dissipating excess input-output differential. Use Value: 150 °C max junction temperature allows safe operation at 1.5 W dissipation with proper heatsinking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN switching and amplification applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPSA42 | Higher VCBO (300 V), lower IC (500 mA), TO-92 package | Better suited for high-voltage flyback snubbers; less ideal for 700 mA loads | Select when >100 V collector bias is required; verify derated SOA at elevated temperatures |
| BC547C | Lower VCBO (50 V), higher hFE (420 min), same TO-92 footprint | Optimized for low-current signal amplification; not rated for 700 mA continuous | Choose only for sub-100 mA small-signal stages; avoid in power switching roles |
Compared with MPSA42 and BC547C, the KSC2331YTA uniquely balances 700 mA current handling, 80 V voltage rating, and Y-class hFE consistency - making it optimal for industrial 24–48 V load switching where both power capability and gain predictability matter.
Availability
KSC2331YTA is available at Aetrix Electronics and suitable for relay drivers, LED current sinks, and DC motor controllers requiring stable component supply across extended production cycles and industrial temperature ranges.
Supply support for KSC2331YTA 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 is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensor, and logic solutions for automotive, industrial, cloud computing, and consumer markets.
The KSC2331YTA belongs to ON Semiconductor's legacy general-purpose bipolar transistor portfolio, originally developed by Fairchild for cost-sensitive, high-reliability discrete switching and amplification in industrial control systems.
FAQ
What is the pin configuration of the KSC2331YTA?
The KSC2331YTA uses a TO-92L package with pin 1 as Emitter, pin 2 as Collector, and pin 3 as Base - confirmed by Fairchild's official datasheet Rev. 1.1.0 and ON Semiconductor's cross-reference documentation. This configuration is standardized across all KSC2331 variants and must be verified during PCB layout to prevent functional failure due to reversed polarity.
Does the KSC2331YTA have a specified hFE range, and how is it marked?
Yes, the KSC2331YTA is Y-classified with hFE = 120–240 at VCE = 2 V and IC = 50 mA. The "Y" in the part number KSC2331YTA directly indicates this gain bin, and the top-mark "C2331 Y-" on the device body confirms the classification per Fairchild's marking standard.
Can the KSC2331YTA replace the KSC2331OTA in a design?
Yes, the KSC2331YTA and KSC2331OTA share identical electrical specifications and TO-92L packaging; only the hFE bin differs (Y = 120–240 vs. O = 70–140). No PCB changes are needed, but system-level gain stability should be revalidated if the original design relied on the narrower O-bin tolerance.
What is the maximum power dissipation of the KSC2331YTA at 70°C ambient temperature?
The KSC2331YTA has a 1 W maximum power dissipation at TA = 25°C, derating at 8.0 mW/°C above that point. At 70°C ambient, allowable PD = 1 W − (8.0 mW/°C × 45°C) = 640 mW - assuming standard FR-4 PCB mounting per datasheet thermal test condition.
Is the KSC2331YTA RoHS compliant and halogen-free?
Yes, the KSC2331YTA meets RoHS Directive 2011/65/EU and is halogen-free per ON Semiconductor's product compliance documentation. The device carries the "Pb-Free" and "Halogen Free" markings on its shipping reels and data sheet revision history, confirming compliance effective from post-Fairchild integration manufacturing lots.
KSC2331YTA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 Long Body, Formed Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 700 mA
- Voltage - Collector Emitter Breakdown (Max):
- 60 V
- Vce Saturation (Max) @ Ib, Ic:
- 700mV @ 50mA, 500mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 120 @ 50mA, 2V
- Power - Max:
- 1 W
- Frequency - Transition:
- 50MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
KSC2331YTA FAQ
1.How can I place an order for KSC2331YTA through Aetrix?
Please submit a Request for Quotation (RFQ) for KSC2331YTA 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 KSC2331YTA reliable?
The price and inventory of KSC2331YTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSC2331YTA is usually 5 days.
3.What payment methods are accepted for KSC2331YTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSC2331YTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSC2331YTA?
KSC2331YTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSC2331YTA 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 KSC2331YTA?
For technical support, including KSC2331YTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSC2331YTA requirements.
6.How does Aetrix verify that KSC2331YTA is sourced from the original manufacturer or authorized distributors?
All KSC2331YTA 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 KSC2331YTA meets industry standards.
7.What is the process for return or replacement of KSC2331YTA?
All KSC2331YTA units undergo pre-shipment inspection (PSI). If there is an issue with KSC2331YTA, 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 KSC2331YTA part is unused and in its original packaging.
Return procedure for KSC2331YTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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