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onsemi KSA992FBU
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- Part No.:
- KSA992FBU
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
KSA992FBU.pdf
- Description:
- TRANS PNP 120V 0.05A TO-92-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,384
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Product details
Overview
KSA992FBU from onsemi is a PNP epitaxial silicon transistor designed for audio-frequency low-noise amplification, with −120 V collector-emitter voltage rating, −50 mA continuous collector current, 500 mW power dissipation, and 50–100 MHz current gain bandwidth product (fT). It serves as a complement to the KSC1845 NPN device in push-pull amplifier stages.
For engineers reviewing the KSA992FBU datasheet, pinout, applications, or equivalent options, key selection criteria include its TO-92 package configuration, hFE classification (FB: 430–600 at −1 mA), low noise figure (7 dB @ 1 kHz), and Pb-free compliance - all critical for legacy audio signal chain design and replacement sourcing.
Technical Context
The KSA992FBU operates as a general-purpose PNP bipolar junction transistor optimized for linear amplification in the audio band. Its electrical behavior is defined by three key DC parameters: VCEO = −120 V, IC = −50 mA, and hFE2 = 430–600 (FB grade) at VCE = −6 V and IC = −1 mA.
Thermal performance is characterized by RJA = 250 °C/W on standard FR-4 PCB (76 mm × 114 mm), with linear derating of 4 mW/°C above 25 °C. Noise performance (NF = 7 dB) and output capacitance (Cob = 2–3 pF @ −30 V) support stable high-fidelity small-signal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −120 V - Supports high-voltage audio stage biasing without breakdown in single-supply or split-rail configurations. |
| IC | −50 mA - Enables drive capability for line-level preamplifier loads and medium-gain active filters. |
| fT | 50–100 MHz - Ensures adequate gain margin and phase stability up to 20 kHz with low distortion. |
| NF | 7 dB @ 1 kHz - Meets low-noise requirements for microphone preamps and phono-stage inputs. |
| hFE2 (FB) | 430–600 @ −1 mA - Provides predictable DC bias stability and consistent gain across production lots. |
| PD | 500 mW - Allows operation at elevated ambient temperatures with appropriate PCB copper area. |
| Cob | 2–3 pF @ −30 V - Minimizes high-frequency loading in cascode or tuned amplifier topologies. |
Pinout & Package
Package: TO-92 (Case 135AN), molded plastic, Pb-free, through-hole mounting. Dimensions: 4.825 mm × 4.76 mm × 3.6 mm (L × W × H). Lead-formed variant available as Case 135AR.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current source terminal for PNP operation | Connected to most positive rail in common-emitter amplifier; sets DC bias reference point. |
| 2 (Collector) | Current sink terminal | Drives load or next stage; requires negative voltage relative to emitter for active-mode conduction. |
| 3 (Base) | Control input for minority-carrier injection | Accepts small forward-biased current to regulate collector-emitter conduction; sensitive to ESD. |
Key Features
| Feature | Design Value |
|---|---|
| Audio-frequency low-noise amplification | 7 dB noise figure at 1 kHz enables clean signal amplification in microphone and sensor front-ends. |
| Complementary pairing with KSC1845 | Matched VCEO, IC, and fT allows symmetrical Class AB output stages with minimized crossover distortion. |
| FB hFE classification (430–600) | Reduces need for individual gain binning in production; simplifies bias network design for consistent Q-point. |
| Pb-free TO-92 packaging | Meets RoHS Directive 2011/65/EU; compatible with lead-free reflow and wave soldering processes. |
Applications
| Microphone Preamp Stage | Phono Equalization Amplifier |
|---|---|
|
Use Scenario: Amplifying low-level signals from dynamic or condenser microphones before ADC or analog processing. IC Role / Device Role / Timing Role: PNP small-signal amplifier in common-emitter configuration with emitter degeneration. Use Value: 7 dB noise figure and 50–100 MHz fT preserve signal integrity and headroom up to 20 kHz. |
Use Scenario: Implementing RIAA equalization networks in vinyl playback systems requiring precise gain vs. frequency response. IC Role / Device Role / Timing Role: Active gain element in passive-active hybrid filter topology with tight hFE tolerance. Use Value: FB-grade hFE (430–600) ensures repeatable pole/zero placement across units without manual trimming. |
| Push-Pull Audio Driver | Low-Voltage Sensor Signal Conditioning |
|
Use Scenario: Complementary pair driver for Class AB headphone or speaker outputs in portable audio devices. IC Role / Device Role / Timing Role: PNP half of matched KSA992FBU/KSC1845 pair delivering symmetrical current sourcing/sinking. Use Value: Matched VCEO (−120 V) and fT minimize thermal runaway and ensure balanced slew rate in both halves. |
Use Scenario: Amplifying millivolt-level outputs from thermocouples, strain gauges, or photodiodes in industrial monitoring systems. IC Role / Device Role / Timing Role: First-stage DC-coupled amplifier with high input impedance and low input bias current. Use Value: ICEO ≤ −1 µA and ICBO ≤ −50 nA reduce offset drift and improve long-term measurement stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP audio amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| KSA992FBTA | Same die, identical electrical specs, but lead-formed TO-92 (Case 135AR) vs. straight-lead (Case 135AN). | Requires different pick-and-place nozzle and wave solder pallet; same circuit function and layout footprint. | Select KSA992FBTA only when automated assembly mandates lead-formed leads for mechanical stability. |
| MPSA92 | Lower hFE range (25–200), higher VCEO (−300 V), no FB classification; noise figure not specified. | Better suited for high-voltage switching than low-noise linear amplification; unsuitable for precision audio gain matching. | Choose MPSA92 only for non-audio, high-voltage switching roles where noise and hFE consistency are secondary. |
Compared with KSA992FBU, KSA992FBTA offers identical electrical performance in a mechanically distinct TO-92 variant, while MPSA92 trades audio-grade noise and gain control for higher voltage tolerance - making it inappropriate for direct substitution in low-noise amplifier designs.
Availability
KSA992FBU is available at Aetrix Electronics and suitable for microphone preamplifiers, phono equalization circuits, push-pull audio drivers, and low-voltage sensor signal conditioning requiring stable component supply despite end-of-life status.
Supply support for KSA992FBU 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 logic solutions for automotive, industrial, and consumer markets.
The KSA992FBU belongs to onsemi's legacy bipolar transistor family engineered for high-fidelity audio signal amplification and complementary pair operation - emphasizing low noise, stable hFE, and robust voltage ratings.
FAQ
Is KSA992FBU still in production?
No, KSA992FBU is officially discontinued per onsemi's January 2026 revision 5 datasheet. However, Aetrix Electronics maintains limited legacy inventory with full traceability and supports last-time-buy planning for ongoing production programs requiring this specific FB-grade PNP transistor.
What does the "FB" suffix mean in KSA992FBU?
The "FB" in KSA992FBU denotes the hFE classification grade: DC current gain between 430 and 600 at −1 mA collector current and −6 V collector-emitter voltage. This tighter binning ensures predictable bias stability in production audio amplifier designs using the KSA992FBU.
Can KSA992FBU replace KSA992FTA in a PCB design?
Yes - KSA992FBU and KSA992FTA share identical TO-92 package dimensions (Case 135AN), pinout, and electrical specifications. The only difference is packaging format (bulk bag vs. fan-fold tape), so no PCB changes are required when substituting KSA992FBU for KSA992FTA in existing layouts.
What is the maximum safe operating temperature for KSA992FBU?
KSA992FBU has a maximum junction temperature (TJ) of 150 °C and storage temperature range of −55 °C to +150 °C. With RJA = 250 °C/W on standard FR-4, sustained operation above 75 °C ambient requires thermal relief via copper pour or forced airflow to prevent exceeding TJ.
Does KSA992FBU require external compensation for audio applications?
No - KSA992FBU's fT of 50–100 MHz provides ample gain-bandwidth margin for audio frequencies (≤20 kHz). Its Cob of 2–3 pF and low NF eliminate need for external Miller compensation in typical common-emitter preamp configurations using the KSA992FBU.
KSA992FBU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Packaging:
- Bulk
- Product Status:
- Active
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 50 mA
- Voltage - Collector Emitter Breakdown (Max):
- 120 V
- Vce Saturation (Max) @ Ib, Ic:
- 300mV @ 1mA, 10mA
- Current - Collector Cutoff (Max):
- 1µA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 300 @ 1mA, 6V
- Power - Max:
- 500 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
KSA992FBU FAQ
1.How can I place an order for KSA992FBU through Aetrix?
Please submit a Request for Quotation (RFQ) for KSA992FBU 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 KSA992FBU reliable?
The price and inventory of KSA992FBU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSA992FBU is usually 5 days.
3.What payment methods are accepted for KSA992FBU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSA992FBU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSA992FBU?
KSA992FBU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSA992FBU 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 KSA992FBU?
For technical support, including KSA992FBU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSA992FBU requirements.
6.How does Aetrix verify that KSA992FBU is sourced from the original manufacturer or authorized distributors?
All KSA992FBU 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 KSA992FBU meets industry standards.
7.What is the process for return or replacement of KSA992FBU?
All KSA992FBU units undergo pre-shipment inspection (PSI). If there is an issue with KSA992FBU, 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 KSA992FBU part is unused and in its original packaging.
Return procedure for KSA992FBU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
KSA992FBU Tags
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MMBT3906LT1G
onsemi
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MMBT3906-7-F
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MMBT2222A-7-F
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BC846BLT1G
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BC847B,215
Nexperia USA Inc.
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SMMBT3904LT1G
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MMBTA06LT1G
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