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onsemi KSA733LBU
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- Part No.:
- KSA733LBU
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
KSA733LBU.pdf
- Description:
- TRANS PNP 50V 0.15A TO-92-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,764
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Product details
Overview
KSA733LBU from ON Semiconductor is a PNP epitaxial silicon transistor designed for low-frequency amplification and switching applications, with VCBO = −60 V, VCEO = −50 V, IC = −150 mA, hFE = 350–700 (L-class), and fT = 50–180 MHz. It serves as a complement to the NPN KSC945 in push-pull amplifier stages and discrete bias networks.
For engineers reviewing the KSA733LBU datasheet, pinout, applications, or equivalent options, key selection criteria include its TO-92 package, emitter-base breakdown voltage of −5 V, collector-emitter saturation voltage down to −0.18 V at IC = −100 mA/IB = −10 mA, and noise figure of 6.0–20 dB at 1 MHz.
Technical Context
The KSA733LBU operates as a general-purpose PNP bipolar junction transistor optimized for audio-frequency amplification and linear switching. Its DC current gain classification "L" denotes hFE = 350–700 at VCE = −6 V and IC = −1 mA, and it exhibits low output capacitance (Cob = 2.8 pF) and moderate bandwidth (fT up to 180 MHz).
It features complementary pairing with KSC945 for Class-A/AB amplifier designs, supports operation across −55 °C to +150 °C junction temperature range, and maintains stable gain and saturation characteristics under low-to-moderate collector current conditions (≤−150 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Device Type | PNP bipolar junction transistor (BJT), not a MOSFET or IC |
| VCBO | −60 V - maximum reverse voltage between collector and base before breakdown |
| VCEO | −50 V - maximum reverse voltage between collector and emitter with base open |
| hFE (L-class) | 350–700 - DC current gain suitable for high-gain low-noise preamplifier stages |
| VCE(sat) | −0.18 V to −0.3 V at IC = −100 mA/IB = −10 mA - enables low-loss switching in saturated mode |
| fT | 50–180 MHz - usable bandwidth extends into VHF range for RF driver or oscillator buffer roles |
| Cob | 2.8 pF at VCB = −10 V - low output capacitance minimizes Miller effect in amplifier feedback paths |
Pinout & Package
Package: TO-92 (3-lead plastic through-hole), standardized lead configuration with Emitter-Base-Collector pin order (1–2–3). Dimensions comply with JEDEC TO-92 outline: body height ≤ 4.58 mm, lead pitch 1.27 mm, overall length ≤ 4.58 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current sink terminal for PNP operation | Connected to most positive rail in common-emitter amplifier configurations |
| 2 (Base) | Control input for minority-carrier injection | Requires negative bias relative to emitter to forward-bias BE junction |
| 3 (Collector) | Current source terminal | Typically tied to load or pull-down network; reverse-biased relative to emitter during active operation |
Key Features
| Feature | Design Value |
|---|---|
| Complementary Pairing | Explicitly matched to KSC945 for push-pull, differential, and phase-splitter circuits |
| Low Saturation Voltage | VCE(sat) ≤ −0.3 V ensures minimal power loss and heat generation in switching applications |
| High hFE Bandwidth Product | fT ≥ 50 MHz supports stable gain in audio preamps and IF amplifier stages up to ~10 MHz |
| Low Noise Figure | NF = 6.0 dB (typ.) at 1 MHz enables use in sensitive analog front-end signal conditioning |
Applications
| Audio Pre-amplifier Stage | Discrete Bias Network |
|---|---|
Use Scenario: Amplifying weak microphone or line-level signals prior to ADC sampling or tone control circuitry. IC Role / Device Role / Timing Role: PNP BJT configured in common-emitter topology providing voltage gain and impedance transformation. Use Value: High hFE (350–700) and low NF (6.0 dB typ.) preserve SNR while delivering >20 dB gain at 1 kHz. | Use Scenario: Setting quiescent operating point for Class-A amplifier output transistors using diode-connected or VBE-multiplier biasing. IC Role / Device Role / Timing Role: Active current source/sink element stabilizing DC bias in analog power stages. Use Value: Tight VBE(on) tolerance (−0.50 to −0.80 V) and thermal stability enable repeatable bias current over temperature. |
| Push-Pull Output Driver | Low-Voltage Switching Load Control |
Use Scenario: Driving small speakers or piezoelectric transducers in battery-powered audio systems. IC Role / Device Role / Timing Role: Complementary PNP half of push-pull pair with KSC945, handling positive half-cycle conduction. Use Value: Low VCE(sat) (−0.18 V min.) reduces crossover distortion and improves efficiency below 5 V supply rails. | Use Scenario: Enabling/disabling LED arrays, relay coils, or sensor power rails in microcontroller-based embedded systems. IC Role / Device Role / Timing Role: Saturated switch controlling current flow from positive rail to grounded load. Use Value: IC(max) = −150 mA and PC = 250 mW support reliable on/off control of loads up to ~100 mA at 3.3–5 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| KSA733YBU | hFE = 120–240 (Y-class), lower gain, tighter VCE(sat) distribution | Better suited for consistent switching timing where gain variation must be minimized | Select when predictable turn-on delay and reduced hFE spread are required over maximum amplification |
| MPSA92 | Higher VCBO (−300 V), lower fT (≈50 MHz), TO-92 compatible but non-complementary to KSC945 | Preferred in high-voltage switching (e.g., CRT deflection, flyback snubbers) rather than audio amplification | Choose only when breakdown voltage > −100 V is mandatory; not drop-in for KSA733LBU amplifier roles |
Compared with KSA733YBU and MPSA92, the KSA733LBU delivers the highest hFE range (350–700) and best noise performance for low-level signal amplification, while retaining full TO-92 mechanical compatibility and complementary pairing with KSC945-making it optimal for dual-transistor audio and bias circuits requiring gain consistency and low distortion.
Availability
KSA733LBU is available at Aetrix Electronics and suitable for audio pre-amplifiers, discrete bias networks, push-pull drivers, and low-voltage switching load control requiring stable component supply and long-term industrial availability.
Supply support for KSA733LBU 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, and consumer markets.
The KSA733LBU belongs to ON Semiconductor's legacy general-purpose bipolar transistor product line, originally developed by Fairchild Semiconductor for cost-sensitive, high-reliability linear and switching applications in consumer audio and industrial controls.
FAQ
What is the pin configuration of the KSA733LBU?
The KSA733LBU uses a standard TO-92 package with pin 1 = Emitter, pin 2 = Base, pin 3 = Collector. This configuration is confirmed in the official ON Semiconductor datasheet Rev. A2 and matches the "suffix -C" designation meaning Center Collector (though physical pin 3 is collector, not center). The KSA733LBU pinout is identical to KSA733YBU and KSA733OBU variants.
What does the "L" suffix mean in KSA733LBU?
The "L" in KSA733LBU designates the hFE gain classification band: 350–700 at VCE = −6 V and IC = −1 mA. This is the highest gain bin among KSA733 variants (R/O/Y/G/L), making the KSA733LBU optimal for low-noise, high-gain amplifier stages where signal integrity is critical.
Is the KSA733LBU complementary to the KSC945?
Yes-the KSA733LBU is explicitly specified as the PNP complement to the NPN KSC945 in the ON Semiconductor datasheet. Both share matching electrical characteristics (VCEO, fT, Cob) and TO-92 packaging, enabling direct use in push-pull, differential pair, and phase-splitter topologies without redesign.
Can the KSA733LBU be used in switching applications?
Yes-the KSA733LBU supports switching operation with VCE(sat) as low as −0.18 V at IC = −100 mA/IB = −10 mA and a maximum collector current rating of −150 mA. Its 250 mW power dissipation and TO-92 thermal profile suit low-duty-cycle, low-power switching in battery-operated devices and sensor interface circuits.
What is the maximum operating temperature for the KSA733LBU?
The KSA733LBU has a maximum junction temperature (TJ) of +150 °C and a storage temperature range of −55 °C to +150 °C. These ratings are defined in the Absolute Maximum Ratings table of the ON Semiconductor datasheet and apply to all KSA733 variants including KSA733LBU.
KSA733LBU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 150 mA
- Voltage - Collector Emitter Breakdown (Max):
- 50 V
- Vce Saturation (Max) @ Ib, Ic:
- 300mV @ 10mA, 100mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 350 @ 1mA, 6V
- Power - Max:
- 250 mW
- Frequency - Transition:
- 180MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
KSA733LBU FAQ
1.How can I place an order for KSA733LBU through Aetrix?
Please submit a Request for Quotation (RFQ) for KSA733LBU 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 KSA733LBU reliable?
The price and inventory of KSA733LBU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSA733LBU is usually 5 days.
3.What payment methods are accepted for KSA733LBU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSA733LBU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSA733LBU?
KSA733LBU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSA733LBU 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 KSA733LBU?
For technical support, including KSA733LBU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSA733LBU requirements.
6.How does Aetrix verify that KSA733LBU is sourced from the original manufacturer or authorized distributors?
All KSA733LBU 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 KSA733LBU meets industry standards.
7.What is the process for return or replacement of KSA733LBU?
All KSA733LBU units undergo pre-shipment inspection (PSI). If there is an issue with KSA733LBU, 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 KSA733LBU part is unused and in its original packaging.
Return procedure for KSA733LBU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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