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onsemi KSC2328AOBU
- Part No.:
- KSC2328AOBU
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 Long Body
- Datasheet:
-
KSC2328AOBU.pdf
- Description:
- TRANS NPN 30V 2A TO-92-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,197
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Product details
Overview
KSC2328AOBU from onsemi is an NPN epitaxial silicon transistor designed for audio power amplifier stages, delivering up to 3 W output with 30 V collector-emitter breakdown voltage, 2 A continuous collector current, and 120 MHz transition frequency in a TO-92 package.
For engineers reviewing the KSC2328AOBU datasheet, pinout, applications, or equivalent options, this discrete BJT supports mid-power linear amplification where DC current gain (hFE = 100–200), low saturation voltage (VCE(sat) ≤ 2.0 V at IC = 1.5 A), and thermal resistance (125 °C/W) are critical selection criteria.
Technical Context
This device operates as a medium-power NPN switching and linear amplifier transistor with complementary pairing to KSA928A. Its 30 V VCEO, 2 A IC, and 120 MHz fT support Class AB audio output stages and DC-coupled driver circuits requiring stable hFE across 500 mA bias points.
Thermal design is constrained by RθJA = 125 °C/W on standard FR-4 PCBs (76 mm × 114 mm), with safe operating area limited to 1 W at 25 °C ambient and derated 8 mW/°C above that temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 30 V - Maximum collector-emitter voltage before breakdown under open-base conditions; defines rail voltage limit in amplifier output stage |
| IC | 2 A - Continuous collector current rating; supports peak audio output currents up to 1.5 A with VCE(sat) ≤ 2.0 V |
| hFE | 100–200 - DC current gain at VCE = 2 V, IC = 500 mA; ensures predictable base drive requirements in linear operation |
| fT | 120 MHz - Transition frequency; enables stable gain in audio bandwidth (20 Hz–20 kHz) with margin for transient response |
| PD | 1000 mW - Maximum power dissipation at 25 °C ambient; requires heatsinking or layout derating for sustained >500 mW operation |
| Cob | 30 pF - Collector-output capacitance at 10 V VCB; impacts high-frequency stability and Miller effect in common-emitter configurations |
Pinout & Package
Package: TO-92 (Case 135AM), Pb-free, through-hole mounting. Standard leadform per mechanical outline 8.0 mm × 4.9 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current sink terminal | Connected to ground or low-impedance return path; sets reference for VBE and VCE biasing |
| 2 (Collector) | Current source terminal | Drives load (e.g., speaker transformer or next-stage input); handles full output current and voltage swing |
| 3 (Base) | Control input terminal | Receives current-limited drive signal; requires ~30 mA base current to saturate at IC = 1.5 A |
Key Features
| Feature | Design Value |
|---|---|
| Audio power amplifier optimized | Validated 3 W output capability with low distortion in Class AB configurations per datasheet application note |
| Complementary pair to KSA928A | Enables push-pull output stage implementation without gain or voltage mismatch across NPN/PNP halves |
| High fT / low Cob balance | 120 MHz fT and 30 pF Cob jointly support wideband linearity while minimizing high-frequency instability risk |
| Robust thermal performance | RθJA = 125 °C/W on standard FR-4 PCB allows 1 W operation with ≤75 °C junction rise above 25 °C ambient |
Applications
| Audio Power Output Stage | DC Motor Driver Stage |
|---|---|
Use Scenario: Final amplification stage in portable stereo or intercom systems driving 4–8 Ω speakers. IC Role / Device Role / Timing Role: NPN power switch amplifying line-level input to deliver 3 W RMS into resistive load. Use Value: Delivers verified 3 W output with <1% THD at 1 kHz using standard Class AB biasing and heat-sink-free PCB layout. | Use Scenario: H-bridge half-bridge leg controlling bidirectional 12 V DC motors in small appliances. IC Role / Device Role / Timing Role: Medium-current NPN switch turning motor winding on/off with fast turn-on (driven by logic-level base signal). Use Value: Supports 1.5 A continuous motor current with VCE(sat) ≤ 2.0 V, reducing conduction loss and self-heating during PWM operation. |
| Linear Voltage Regulator Pass Element | Signal-Level Current Amplifier |
Use Scenario: Series pass transistor in adjustable 5–12 V linear regulators powering analog sensor modules. IC Role / Device Role / Timing Role: Adjustable current-source element regulating output voltage via feedback-controlled base current. Use Value: Maintains regulation stability with hFE = 100–200 and low VBE(on) (≤1.0 V), minimizing dropout voltage at 500 mA load. | Use Scenario: Boosting microcontroller GPIO current to drive LED arrays or optocouplers in industrial I/O modules. IC Role / Device Role / Timing Role: Non-saturated current amplifier converting 5 mA logic output into ≥500 mA load current. Use Value: Provides precise current gain control with tested hFE spread (O-class: 100–200), enabling deterministic base resistor selection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJD2955G | Higher VCEO (60 V), lower fT (3 MHz), TO-220 package | Better suited for higher-voltage switching; unsuitable for RF-critical audio stages due to low fT | Select when >30 V rail voltage or higher power dissipation (>1.5 W) is required; not drop-in compatible |
| KSC1845FTA | Same TO-92 package, lower IC (1 A), higher hFE (200–400), fT = 100 MHz | Optimized for low-current preamp gain; insufficient for 3 W output loads | Use only in low-power signal amplification where <500 mA collector current suffices |
Compared with MJD2955G and KSC1845FTA, the KSC2328AOBU uniquely balances 30 V rating, 2 A current, 120 MHz fT, and TO-92 form factor for cost-sensitive, mid-power audio and switching applications where thermal management and board space are constrained.
Availability
KSC2328AOBU is available at Aetrix Electronics and suitable for audio power amplifiers, DC motor drivers, linear regulator pass elements, and signal-level current amplifiers requiring stable component supply and Pb-free compliance.
Supply support for KSC2328AOBU 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 management, analog, sensors, and connectivity solutions for automotive, industrial, and consumer markets.
The KSC2328AOBU belongs to onsemi's legacy discrete bipolar transistor product line, engineered specifically for cost-effective, reliable mid-power linear and switching applications in audio, power supply, and interface circuits.
FAQ
What is the maximum collector-emitter voltage rating for KSC2328AOBU?
The KSC2328AOBU has a maximum collector-emitter voltage (VCEO) rating of 30 V at TA = 25 °C. This rating applies under open-base conditions with IC = 10 mA. Exceeding 30 V risks avalanche breakdown and permanent device damage. Derating is required at elevated temperatures per the datasheet thermal curves.
Does KSC2328AOBU have Pb-free construction?
Yes, KSC2328AOBU is manufactured with Pb-free terminations and complies with RoHS Directive 2011/65/EU. The "OBU" suffix explicitly denotes Pb-free bulk packaging per onsemi's ordering nomenclature, and the device uses lead-free solderability plating confirmed in the mechanical drawings.
What is the hFE range for KSC2328AOBU?
The KSC2328AOBU is classified as "O" grade, with a guaranteed DC current gain (hFE) range of 100 to 200 when measured at VCE = 2 V and IC = 500 mA. This hFE binning is marked on the device body and validated per onsemi's production test flow.
Can KSC2328AOBU replace KSC2328AYBU in the same PCB footprint?
Yes, KSC2328AOBU and KSC2328AYBU share identical TO-92 package (Case 135AM), pinout (Emitter-Collector-Base), and mechanical dimensions. Both are Pb-free and functionally equivalent except for hFE binning (O = 100–200, Y = 160–320); no PCB changes are needed for substitution.
What is the thermal resistance junction-to-ambient for KSC2328AOBU?
The KSC2328AOBU has a specified thermal resistance junction-to-ambient (RθJA) of 125 °C/W under standard test conditions: FR-4 PCB, 76 mm × 114 mm × 1.57 mm, with minimum land pattern. This value assumes natural convection cooling and must be adjusted for actual board layout, copper area, and airflow.
KSC2328AOBU 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):
- 2 A
- Voltage - Collector Emitter Breakdown (Max):
- 30 V
- Vce Saturation (Max) @ Ib, Ic:
- 2V @ 30mA, 1.5A
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 500mA, 2V
- Power - Max:
- 1 W
- Frequency - Transition:
- 120MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
KSC2328AOBU FAQ
1.How can I place an order for KSC2328AOBU through Aetrix?
Please submit a Request for Quotation (RFQ) for KSC2328AOBU 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 KSC2328AOBU reliable?
The price and inventory of KSC2328AOBU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSC2328AOBU is usually 5 days.
3.What payment methods are accepted for KSC2328AOBU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSC2328AOBU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSC2328AOBU?
KSC2328AOBU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSC2328AOBU 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 KSC2328AOBU?
For technical support, including KSC2328AOBU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSC2328AOBU requirements.
6.How does Aetrix verify that KSC2328AOBU is sourced from the original manufacturer or authorized distributors?
All KSC2328AOBU 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 KSC2328AOBU meets industry standards.
7.What is the process for return or replacement of KSC2328AOBU?
All KSC2328AOBU units undergo pre-shipment inspection (PSI). If there is an issue with KSC2328AOBU, 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 KSC2328AOBU part is unused and in its original packaging.
Return procedure for KSC2328AOBU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
KSC2328AOBU Tags
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