Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

onsemi KSA992PTA

Name: KSA992PTA
Brand: onsemi
SKU: KSA992PTA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: KSA992PTA

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Datasheet:: KSA992PTA.pdf

Description:: TRANS PNP 120V 0.05A TO-92-3

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:8,113

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

KSA992PTA 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 at 25 °C, and 100 MHz current gain bandwidth product. It serves as a complement to the KSC1845 NPN device in push-pull amplifier stages.

For engineers reviewing the KSA992PTA datasheet, pinout, applications, or equivalent options, key selection criteria include its low noise figure (7 dB at 1 kHz), high DC current gain (300–600 at −1 mA), TO-92 package compatibility, and Pb-free construction per J-STD-609.

Technical Context

This discrete PNP bipolar junction transistor operates in linear amplification mode with verified performance at V_CE = −6 V and I_C = −1 mA. Its f_T of 50–100 MHz and Cob of 2–3 pF at −30 V support stable mid-band audio signal amplification without excessive phase shift or parasitic resonance.

The device exhibits low V_CE(sat) (−0.09 to −0.30 V at −10 mA/−1 mA) and V_BE(on) (−0.55 to −0.65 V), enabling efficient biasing in Class-A and AB amplifier topologies. Its thermal resistance R_JA is 250 °C/W on standard FR-4 PCBs, requiring derating above 25 °C at 4 mW/°C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−120 V: Supports high-voltage audio rails up to ±100 V supply systems without breakdown.
I_C	−50 mA: Enables drive capability for preamplifier and line-driver stages with headroom for transient peaks.
f_T	50–100 MHz: Ensures flat frequency response through 20 kHz with margin for harmonic content and stability.
NF	7 dB @ 1 kHz: Delivers low intrinsic noise in microphone preamps and phono-stage inputs.
h_FE2	300–600 @ −1 mA: Provides predictable DC bias stability across production lots and temperature.
P_D	500 mW @ 25 °C: Allows operation at 300–400 mW in typical ambient conditions with conservative thermal design.
C_ob	2–3 pF @ −30 V: Minimizes Miller effect in common-emitter configurations for wideband fidelity.

Pinout & Package

Package: TO-92 (Case 135AN), 4.825 mm × 4.76 mm body, lead-formed variant compatible with standard through-hole assembly.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Current sink terminal; connects to most negative rail or ground reference in PNP amplifier circuits.
2	Collector	Output node; ties to load resistor or active load in common-emitter configuration.
3	Base	Control input; requires current-limited bias network to set operating point within h_FE range.

Key Features

Feature	Design Value
Low-noise audio amplification	7 dB noise figure at 1 kHz enables high-SNR signal conditioning in sensitive analog front-ends.
Complementary pairing with KSC1845	Matched V_CEO, I_C, and f_T allows symmetrical push-pull output stages without cross-conduction imbalance.
Pb-free construction	Meets J-STD-609 Class 3 requirements for RoHS-compliant manufacturing and end-of-life handling.
High h_FE classification options (F/FA/FB)	FB-grade units deliver 430–600 h_FE2, reducing base drive current and improving power efficiency in battery-powered designs.

Applications

Microphone Preamplifier	Phono Preamp Stage
Use Scenario: Amplifying low-level signals from condenser microphones with minimal added noise. IC Role / Device Role / Timing Role: Discrete PNP transistor configured in common-emitter topology for voltage gain and impedance transformation. Use Value: 7 dB noise figure and 100 MHz f_T preserve signal integrity from 20 Hz to 20 kHz without audible hiss or roll-off.	Use Scenario: Boosting RIAA-equalized output from moving-magnet cartridges before ADC conversion. IC Role / Device Role / Timing Role: Low-distortion linear amplifier with precise DC bias control via h_FE-stable operation. Use Value: −0.09 V V_CE(sat) minimizes clipping headroom loss; −120 V V_CEO accommodates high-gain passive EQ networks.
Push-Pull Line Driver	Low-Voltage Audio Mixer
Use Scenario: Driving 600 Ω professional audio lines with balanced output swing. IC Role / Device Role / Timing Role: Complementary emitter-follower pair (KSA992PTA + KSC1845) delivering low-output-impedance sourcing/sinking. Use Value: Matched h_FE and V_CE(sat) ensure symmetrical slew rate and reduced crossover distortion below 1% THD.	Use Scenario: Summing multiple line-level sources in portable audio equipment powered from 5–9 V supplies. IC Role / Device Role / Timing Role: Single-supply PNP amplifier biased near V_CC/2 for rail-to-rail AC coupling. Use Value: −50 mA I_C rating supports ≥10 mA peak output into 300 Ω loads; TO-92 footprint simplifies compact layout.

Microphone Preamplifier

Phono Preamp Stage

Use Scenario: Amplifying low-level signals from condenser microphones with minimal added noise.

IC Role / Device Role / Timing Role: Discrete PNP transistor configured in common-emitter topology for voltage gain and impedance transformation.

Use Value: 7 dB noise figure and 100 MHz f_T preserve signal integrity from 20 Hz to 20 kHz without audible hiss or roll-off.

Use Scenario: Boosting RIAA-equalized output from moving-magnet cartridges before ADC conversion.

IC Role / Device Role / Timing Role: Low-distortion linear amplifier with precise DC bias control via h_FE-stable operation.

Use Value: −0.09 V V_CE(sat) minimizes clipping headroom loss; −120 V V_CEO accommodates high-gain passive EQ networks.

Push-Pull Line Driver

Low-Voltage Audio Mixer

Use Scenario: Driving 600 Ω professional audio lines with balanced output swing.

IC Role / Device Role / Timing Role: Complementary emitter-follower pair (KSA992PTA + KSC1845) delivering low-output-impedance sourcing/sinking.

Use Value: Matched h_FE and V_CE(sat) ensure symmetrical slew rate and reduced crossover distortion below 1% THD.

Use Scenario: Summing multiple line-level sources in portable audio equipment powered from 5–9 V supplies.

IC Role / Device Role / Timing Role: Single-supply PNP amplifier biased near V_CC/2 for rail-to-rail AC coupling.

Use Value: −50 mA I_C rating supports ≥10 mA peak output into 300 Ω loads; TO-92 footprint simplifies compact layout.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP audio amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
KSA992FBU	Same die, TO-92 bulk packaging (10,000 units/bag); no lead forming; identical electrical specs.	No lead-forming step required-suited for automated insertion where lead geometry is controlled externally.	Select KSA992FBU for high-volume SMT-compatible through-hole assembly with internal lead straightening.
MPSA92	−300 V V_CEO, lower h_FE (25–300), higher Cob (6 pF); same TO-92 package and pinout.	Better suited for high-voltage switching; less optimal for low-noise audio due to higher noise figure and reduced f_T.	Choose MPSA92 only when >−120 V breakdown is required and noise performance is secondary.

Compared with KSA992FBU, KSA992PTA offers factory lead-forming for direct manual or semi-automated placement, while MPSA92 trades audio fidelity for higher voltage tolerance-making KSA992PTA the preferred choice for noise-critical linear amplification where −120 V rating suffices.

Availability

KSA992PTA is available at Aetrix Electronics and suitable for microphone preamplifiers, phono preamp stages, and push-pull line drivers requiring stable component supply and consistent low-noise performance across production batches.

Supply support for KSA992PTA 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 focused on energy-efficient innovation for automotive, industrial, cloud, and intelligent edge applications.

The KSA992PTA belongs to onsemi's legacy discrete bipolar transistor family, engineered specifically for high-fidelity analog signal conditioning in consumer and pro-audio equipment.

FAQ

What is the maximum collector-emitter voltage rating for KSA992PTA?

The KSA992PTA has a maximum collector-emitter voltage (V_CEO) rating of −120 V at 25 °C. This rating applies under DC or pulsed conditions with proper heat sinking and derating above ambient temperatures. Exceeding this value risks permanent junction breakdown. The KSA992PTA must be operated within this limit in all circuit configurations, including common-emitter and common-base topologies.

Does KSA992PTA have Pb-free construction?

Yes, KSA992PTA is a Pb-free device compliant with J-STD-609 Class 3 and RoHS Directive 2011/65/EU. Its lead finish uses matte tin plating over copper leadframe, verified in the official onsemi datasheet revision 5. This ensures compatibility with lead-free reflow profiles and eliminates hazardous substance concerns in final product compliance reporting for KSA992PTA-based designs.

What is the typical noise figure of KSA992PTA and under what conditions is it measured?

The typical noise figure of KSA992PTA is 7 dB, measured at V_CE = −5 V, I_C = −1.0 mA, R_S = 100 kΩ, and f = 1 kHz. This value reflects intrinsic transistor noise in small-signal linear operation and is critical for evaluating KSA992PTA in low-amplitude signal paths such as electret microphone preamplifiers or piezoelectric sensor interfaces.

How does KSA992PTA differ from KSA992FBU?

KSA992PTA and KSA992FBU share identical die and electrical specifications but differ in packaging: KSA992PTA is supplied in lead-formed TO-92 tape-and-reel (2000 units/fan-fold), while KSA992FBU is in bulk bag format (10,000 units) with straight leads. The KSA992PTA's pre-formed leads simplify manual or semi-automated through-hole insertion without additional tooling.

Is KSA992PTA suitable as a direct replacement for MPSA92 in audio amplifier circuits?

No, KSA992PTA is not a direct replacement for MPSA92 in all applications. While both are TO-92 PNP transistors, MPSA92 has −300 V V_CEO and higher Cob (6 pF), making it less suitable for low-noise audio. KSA992PTA offers superior noise figure (7 dB vs. ~10 dB) and bandwidth (100 MHz vs. ~50 MHz), but its −120 V rating limits use in higher-voltage switching. Circuit validation is required before substitution.

KSA992PTA Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Packaging:: Tape & Box (TB)

Product Status:: Obsolete

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:: 200 @ 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

KSA992PTA FAQ

1.How can I place an order for KSA992PTA through Aetrix?

Please submit a Request for Quotation (RFQ) for KSA992PTA 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 KSA992PTA reliable?

The price and inventory of KSA992PTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSA992PTA is usually 5 days.

3.What payment methods are accepted for KSA992PTA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSA992PTA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KSA992PTA?

KSA992PTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KSA992PTA 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 KSA992PTA?

For technical support, including KSA992PTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSA992PTA requirements.

6.How does Aetrix verify that KSA992PTA is sourced from the original manufacturer or authorized distributors?

All KSA992PTA 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 KSA992PTA meets industry standards.

7.What is the process for return or replacement of KSA992PTA?

All KSA992PTA units undergo pre-shipment inspection (PSI). If there is an issue with KSA992PTA, 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 KSA992PTA part is unused and in its original packaging.

Return procedure for KSA992PTA:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…