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onsemi KSC2331YBU
- Part No.:
- KSC2331YBU
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 Long Body
- Datasheet:
-
KSC2331YBU.pdf
- Description:
- TRANS NPN 60V 0.7A TO-92-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,677
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Product details
Overview
KSC2331YBU 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, with confirmed VCBO = 80 V, IC = 700 mA, and hFE range of 120–240 (Y-class). It operates reliably up to 150°C junction temperature and is commonly used in relay drivers and linear voltage regulators.
For engineers reviewing the KSC2331YBU datasheet, pinout, applications, or equivalent options, key selection considerations include its TO-92L package, DC current gain classification, saturation voltage at 500 mA, thermal resistance, and complementarity to KSA931 for push-pull configurations.
Technical Context
This device implements a planar epitaxial NPN structure optimized for stable DC gain and low saturation voltage under moderate current loads. Its breakdown ratings-VCBO = 80 V, VCEO = 60 V, and VEBO = 8 V-define safe operating limits for collector-base, collector-emitter, and emitter-base junctions respectively.
Thermal performance is characterized by RθJA = 125 °C/W on standard FR-4 PCB, supporting 1 W dissipation at 25°C ambient with linear derating of 8.0 mW/°C above that point. The fT of 30–50 MHz confirms suitability for audio-frequency amplification and sub-MHz switching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO | 80 V - Maximum reverse bias voltage sustainable across collector-base junction without breakdown |
| IC | 700 mA - Continuous collector current rating defining maximum load-handling capability |
| hFE (Y-class) | 120–240 - Confirmed DC current gain range at VCE = 2 V, IC = 50 mA, enabling predictable base drive design |
| VCE(sat) | 0.2–0.7 V - Collector-emitter saturation voltage at IC = 500 mA, IB = 50 mA, directly impacting conduction loss |
| fT | 30–50 MHz - Current gain bandwidth product limiting usable frequency range for small-signal amplification |
| RθJA | 125 °C/W - Junction-to-ambient thermal resistance on standard PCB, determining required heatsinking for thermal management |
Pinout & Package
Package: TO-92L (3-lead plastic through-hole), lead material: matte tin-plated copper, body dimensions: 4.7 mm × 3.8 mm × 4.6 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current exit path from transistor | Connected to ground or low-side return; defines reference for VBE and current loop closure |
| 2 (Collector) | Current entry path into transistor | Typically tied to load or supply rail; carries full switched/amplified output current |
| 3 (Base) | Control terminal for carrier injection | Receives current-limited drive signal; base resistance selection determines operating point stability |
Key Features
| Feature | Design Value |
|---|---|
| Complementary PNP pairing | Designed as direct counterpart to KSA931 for balanced push-pull amplifier stages |
| High VCBO rating | 80 V enables use in 48 V industrial bus interfaces and flyback snubber circuits without derating |
| Y-class hFE binning | 120–240 gain spread ensures consistent base drive requirements across production lots |
| Low VCE(sat) | 0.2 V minimum at 500 mA reduces conduction loss in linear regulator pass elements |
Applications
| Relay Driver Circuit | Linear Voltage Regulator |
|---|---|
Use Scenario: Driving 12 V/500 mA electromagnetic relay coil from microcontroller GPIO. IC Role / Device Role / Timing Role: Medium-speed switching transistor acting as grounded-emitter current sink. Use Value: Low VCE(sat) minimizes power loss during coil hold state; 700 mA IC rating provides 40% margin over relay coil current. | Use Scenario: Pass element in adjustable 3–24 V, 500 mA linear regulator using LM317 feedback network. IC Role / Device Role / Timing Role: Series pass transistor regulating output voltage via base-controlled collector current. Use Value: High hFE reduces required base drive current; 80 V VCBO supports input up to 40 V without breakdown risk. |
| Audio Preamp Stage | DC Motor Speed Control |
Use Scenario: First-stage low-noise voltage amplifier in battery-powered microphone preamplifier. IC Role / Device Role / Timing Role: Common-emitter small-signal amplifier with fixed bias network. Use Value: fT ≥ 30 MHz ensures flat response up to 20 kHz; Y-class hFE enables stable gain setting with minimal variance. | Use Scenario: PWM-controlled interface between MCU and 24 V, 300 mA brushed DC motor. IC Role / Device Role / Timing Role: Low-frequency switch controlling motor current path to ground. Use Value: TO-92L package allows direct PCB mounting in space-constrained motor driver modules; 150°C TJ rating accommodates ambient heating near motor housing. |
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 |
|---|---|---|---|
| BC548C | Lower VCBO (30 V), lower IC (100 mA), smaller hFE range (420–800), TO-92 package | Not suitable for >30 V supply rails or >100 mA loads; limited to low-power signal stages | Select only for low-voltage, low-current signal amplification where gain consistency matters more than voltage headroom |
| MPSA14 | Higher IC (500 mA), higher VCBO (60 V), same TO-92 package, hFE 100–300 (no Y-bin) | Marginally lower voltage rating and un-binned gain make it less optimal for precision 48 V relay drivers | Prefer when cost sensitivity outweighs need for guaranteed Y-class gain or 80 V breakdown margin |
Compared with BC548C and MPSA14, KSC2331YBU delivers superior voltage robustness (80 V vs. ≤60 V), higher current capacity (700 mA), and factory-binned high-gain performance-making it the preferred choice for industrial relay drivers and 24–48 V linear regulators requiring reliability and design margin.
Availability
KSC2331YBU is available at Aetrix Electronics and suitable for relay drivers, linear voltage regulators, audio preamplifiers, and DC motor speed control circuits requiring stable component supply and long-term industrial availability.
Supply support for KSC2331YBU 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 semiconductor manufacturer specializing in energy-efficient power management, analog, sensor, and logic solutions for automotive, industrial, and consumer markets.
KSC2331YBU belongs to ON Semiconductor's legacy general-purpose bipolar transistor family, engineered for robustness and consistency in discrete amplifier and switching applications across industrial control and power supply designs.
FAQ
What is the pin configuration of KSC2331YBU?
KSC2331YBU uses a TO-92L package with standardized pinout: Pin 1 is Emitter, Pin 2 is Collector, and Pin 3 is Base. This configuration is verified in the official ON Semiconductor datasheet Rev. 1.1.0 and matches industry-standard TO-92 layout conventions for NPN transistors. Always confirm orientation via the top-mark "C2331 Y-" before PCB layout.
What does the "Y" suffix in KSC2331YBU indicate?
The "Y" in KSC2331YBU denotes the hFE gain bin: 120–240 at VCE = 2 V and IC = 50 mA. This classification ensures tighter gain distribution versus "R" (40–80) or "O" (70–140) variants, simplifying base resistor selection in production designs. The full part number KSC2331YBU reflects this Y-class specification and TO-92L packaging.
Can KSC2331YBU replace KSC2331YTA?
Yes-KSC2331YBU and KSC2331YTA share identical electrical specifications, TO-92L package, and Y-class hFE binning. The "BU" and "TA" suffixes reflect different tape-and-reel packing methods per ON Semiconductor's ordering nomenclature; both are functionally interchangeable in circuit design. KSC2331YBU remains fully compatible with existing KSC2331YTA schematics and layouts.
What is the maximum power dissipation for KSC2331YBU at 70°C ambient?
At 70°C ambient, KSC2331YBU's maximum power dissipation is 600 mW. This is calculated from its 1 W rating at 25°C and 8.0 mW/°C derating: 1000 mW − (8.0 mW/°C × 45°C) = 640 mW, rounded conservatively to 600 mW per standard practice. This value assumes standard FR-4 PCB mounting per datasheet thermal test conditions and must be validated with actual board layout and airflow.
Is KSC2331YBU suitable for switching 48 V loads?
KSC2331YBU is rated for VCBO = 80 V and VCEO = 60 V, making it suitable for switching 48 V DC loads only when operated within its absolute maximum ratings and with appropriate safety margin. For reliable 48 V operation, ensure VCE never exceeds 60 V under all transient and switching conditions. Use clamping diodes or snubbers if inductive kick exceeds this limit. KSC2331YBU has been validated in such roles in industrial relay driver designs.
KSC2331YBU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 Long Body
- Packaging:
- Bulk
- 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
KSC2331YBU FAQ
1.How can I place an order for KSC2331YBU through Aetrix?
Please submit a Request for Quotation (RFQ) for KSC2331YBU 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 KSC2331YBU reliable?
The price and inventory of KSC2331YBU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSC2331YBU is usually 5 days.
3.What payment methods are accepted for KSC2331YBU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSC2331YBU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSC2331YBU?
KSC2331YBU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSC2331YBU 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 KSC2331YBU?
For technical support, including KSC2331YBU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSC2331YBU requirements.
6.How does Aetrix verify that KSC2331YBU is sourced from the original manufacturer or authorized distributors?
All KSC2331YBU 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 KSC2331YBU meets industry standards.
7.What is the process for return or replacement of KSC2331YBU?
All KSC2331YBU units undergo pre-shipment inspection (PSI). If there is an issue with KSC2331YBU, 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 KSC2331YBU part is unused and in its original packaging.
Return procedure for KSC2331YBU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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