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onsemi KSA992FBTA
- Part No.:
- KSA992FBTA
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
KSA992FBTA.pdf
- Description:
- TRANS PNP 120V 0.05A TO-92-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,312
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Product details
Overview
KSA992FBTA from onsemi is a PNP epitaxial silicon transistor designed for audio frequency low-noise amplification, with −120 V collector-base and collector-emitter voltage ratings, −50 mA continuous collector current, 500 mW power dissipation, and 50–100 MHz current gain bandwidth product. It serves as a complement to the KSC1845 NPN transistor in push-pull amplifier stages.
For engineers reviewing the KSA992FBTA datasheet, pinout, applications, or equivalent options, key selection criteria include its FB-grade hFE (430–600 at −1 mA), low noise figure (7 dB at 1 kHz), TO-92 lead-formed package, and discontinued status requiring supply chain planning.
Technical Context
This PNP bipolar junction transistor operates in linear amplification mode with verified DC current gain hFE2 of 430–600 at VCE = −6 V and IC = −1 mA, and exhibits low saturation voltage (VCE(sat) ≤ −0.30 V at IC = −10 mA / IB = −1 mA). Its 2 pF typical output capacitance (Cob) and 7 dB noise figure support high-fidelity audio signal paths.
The device is rated for junction temperatures up to 150 °C and features thermal resistance RJA = 250 °C/W on standard FR-4 PCBs. It is Pb-free, RoHS-compliant, and marked with date code YWW and device code 92X (where X = F, FA, or FB).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO | −120 V - supports high-voltage audio stage biasing without breakdown |
| IC | −50 mA - enables medium-current preamplifier and driver operation |
| hFE2 | 430–600 - ensures stable small-signal gain in low-noise amplifier designs |
| fT | 50–100 MHz - provides sufficient bandwidth for wideband audio and IF applications |
| NF | 7 dB @ 1 kHz - meets low-noise requirements for microphone and phono preamp circuits |
| PD | 500 mW - allows operation at elevated ambient temperatures with derating |
| Cob | 2–3 pF @ VCB = −30 V - minimizes high-frequency loading in tuned circuits |
Pinout & Package
Package: TO-92 lead-formed (Case 135AR), dimensions 4.83 mm × 4.76 mm, Pb-free, with standardized 3-pin through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current source terminal for PNP operation | Connected to higher potential rail; defines current direction and bias polarity |
| 2 (Collector) | Current sink terminal | Typically tied to load or next stage input; voltage swing limited by VCEO = −120 V |
| 3 (Base) | Control electrode for current amplification | Receives forward-biased drive; requires VBE(on) ≈ −0.61 V for conduction |
Key Features
| Feature | Design Value |
|---|---|
| Audio frequency low-noise amplifier | 7 dB noise figure at 1 kHz enables clean signal amplification in sensitive analog front-ends |
| Complement to KSC1845 | Enables matched PNP/NPN pair design for Class AB output stages and differential amplifiers |
| FB hFE grade | Guaranteed hFE2 = 430–600 ensures consistent gain matching across production lots |
| Pb-free TO-92 package | Meets RoHS compliance requirements and supports automated through-hole assembly |
| High VCEO/VCBO | −120 V rating allows use in high-supply-voltage audio rails and industrial signal conditioning |
Applications
| Phono Preamp Stage | Microphone Preamplifier |
|---|---|
Use Scenario: Amplifies low-level signals from moving-magnet phonograph cartridges before RIAA equalization. IC Role / Device Role / Timing Role: Low-noise PNP transistor in first-stage common-emitter amplifier. Use Value: 7 dB noise figure preserves signal integrity; −120 V VCEO accommodates high-impedance cartridge bias networks. |
Use Scenario: Boosts weak signals from electret condenser microphones in portable audio devices. IC Role / Device Role / Timing Role: Single-transistor amplifier with emitter-follower output for impedance matching. Use Value: FB-grade hFE ensures predictable gain; 500 mW PD supports continuous operation under battery-powered conditions. |
| Push-Pull Audio Driver | Industrial Sensor Signal Conditioning |
Use Scenario: Paired with KSC1845 in complementary Class AB output stage for line drivers or headphone amps. IC Role / Device Role / Timing Role: PNP half of matched emitter-coupled pair delivering symmetrical current sourcing/sinking. Use Value: Matched hFE range (430–600) and identical TO-92 footprint simplify layout and reduce crossover distortion. |
Use Scenario: Amplifies millivolt-level outputs from thermocouples or strain gauges in PLC analog input modules. IC Role / Device Role / Timing Role: Precision DC-coupled amplifier with low input bias current and stable hFE. Use Value: ICEO ≤ −1 µA and ICBO ≤ −50 nA minimize offset drift; 150 °C max junction temperature supports extended industrial temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP low-noise amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| KSA992FBU | Same die, TO-92 non-lead-formed (Case 135AN); identical electrical specs; different lead geometry | Requires manual bending or alternate footprint; unsuitable for automated insertion without modification | Select only if lead-forming equipment is unavailable and hand-assembly is acceptable |
| MPSA92 | Higher VCBO (−300 V), lower hFE (25–200), higher noise (10 dB), same TO-92 package | Better suited for high-voltage switching; less optimal for low-noise linear amplification | Use where voltage margin outweighs noise performance; not recommended for audio front-ends |
Compared with KSA992FBTA, KSA992FBU offers identical electrical behavior but requires mechanical adaptation for assembly, while MPSA92 trades noise and gain for extreme voltage capability-making it functionally distinct rather than interchangeable in precision analog roles.
Availability
KSA992FBTA is available at Aetrix Electronics and suitable for audio preamplifiers, sensor signal conditioners, and complementary transistor amplifier stages requiring stable component supply despite its discontinued status.
Supply support for KSA992FBTA 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 manufacturer specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The KSA992FBTA belongs to onsemi's legacy discrete bipolar transistor family, engineered specifically for high-fidelity audio amplification and low-noise analog signal processing in cost-sensitive, through-hole-based designs.
FAQ
Is KSA992FBTA still in production?
No, KSA992FBTA is officially discontinued per onsemi's January 2026 revision 5 datasheet. While remaining inventory may be available through authorized channels like Aetrix Electronics, no new manufacturing runs are planned. Customers should evaluate long-term supply alternatives early and consult Aetrix for last-time-buy planning and cross-reference support for the KSA992FBTA.
What does the "FB" suffix mean in KSA992FBTA?
The "FB" suffix in KSA992FBTA denotes the hFE gain classification band: guaranteed DC current gain hFE2 of 430–600 at VCE = −6 V and IC = −1 mA. This distinguishes it from "F" (300–600) and "FA" (300–470) variants. The "TA" indicates tape-and-reel packaging in fan-fold format, Pb-free, with TO-92 lead-formed (Case 135AR) construction.
Can KSA992FBTA replace KSA992FBU in a design?
KSA992FBTA and KSA992FBU share identical die and electrical specifications, but differ in package form: KSA992FBTA is lead-formed (Case 135AR), while KSA992FBU is straight-lead (Case 135AN). Mechanical compatibility depends on PCB land pattern and assembly method. No circuit-level redesign is needed, but rework or footprint adjustment may be required for KSA992FBTA integration into a KSA992FBU-designed board.
What is the maximum safe operating temperature for KSA992FBTA?
KSA992FBTA has a maximum junction temperature (TJ) of 150 °C and a thermal resistance RJA of 250 °C/W on standard FR-4 PCBs. At ambient temperatures up to 75 °C, the device can safely dissipate ~300 mW before reaching TJ limit. Derating is required above 25 °C at 4 mW/°C, per datasheet thermal characteristics. Always verify board-level thermal performance in final layout for KSA992FBTA.
Does KSA992FBTA support audio applications above 20 kHz?
Yes, KSA992FBTA has a current gain bandwidth product (fT) of 50–100 MHz, far exceeding the 20 kHz audio band. Its 2–3 pF output capacitance and low VCE(sat) (< −0.30 V) ensure minimal phase shift and distortion in high-fidelity wideband amplifiers. Verified performance curves confirm stable hFE and low noise up to 100 kHz, making KSA992FBTA suitable for ultrasonic sensor interfaces and extended-audio preamps.
KSA992FBTA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Packaging:
- Cut Tape (CT)
- 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:
- 430 @ 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
KSA992FBTA FAQ
1.How can I place an order for KSA992FBTA through Aetrix?
Please submit a Request for Quotation (RFQ) for KSA992FBTA 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 KSA992FBTA reliable?
The price and inventory of KSA992FBTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSA992FBTA is usually 5 days.
3.What payment methods are accepted for KSA992FBTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSA992FBTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSA992FBTA?
KSA992FBTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSA992FBTA 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 KSA992FBTA?
For technical support, including KSA992FBTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSA992FBTA requirements.
6.How does Aetrix verify that KSA992FBTA is sourced from the original manufacturer or authorized distributors?
All KSA992FBTA 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 KSA992FBTA meets industry standards.
7.What is the process for return or replacement of KSA992FBTA?
All KSA992FBTA units undergo pre-shipment inspection (PSI). If there is an issue with KSA992FBTA, 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 KSA992FBTA part is unused and in its original packaging.
Return procedure for KSA992FBTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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