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

onsemi KSA733YTA

Name: KSA733YTA
Brand: onsemi
SKU: KSA733YTA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KSA733YTA

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: KSA733YTA.pdf

Description:: TRANS PNP 50V 0.15A TO-92-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

KSA733YTA from ON Semiconductor is a PNP epitaxial silicon transistor designed for low-frequency amplifier and switching applications, with V_CEO = −50 V, I_C = −150 mA, P_C = 250 mW, h_FE = 350–700 (Y-class), and TO-92 package. It serves as a complement to the NPN KSC945 in push-pull or differential pair configurations in audio preamplifiers and signal conditioning circuits.

For engineers reviewing the KSA733YTA datasheet, pinout, applications, or equivalent options, key selection criteria include its Y-class h_FE binning, low V_CE(sat) (−0.18 V min at I_C = −100 mA), noise figure (6.0–20 dB), f_T up to 180 MHz, and TO-92 mechanical compatibility with legacy Fairchild designs.

Technical Context

The KSA733YTA operates as a general-purpose PNP bipolar junction transistor optimized for linear amplification and moderate-speed switching. Its h_FE classification (Y = 350–700) ensures consistent DC gain across production lots, while its f_T of 50–180 MHz supports low-frequency RF and audio bandwidths without oscillation risk under proper biasing.

Designed for single-supply negative-rail operation, it features low base-emitter on voltage (−0.50 to −0.80 V), tight V_CE(sat) tolerance (−0.18 to −0.3 V), and minimal output capacitance (C_ob = 2.8 pF), enabling stable performance in emitter-follower buffers and current-source loads where thermal stability and low distortion are critical.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−50 V - Maximum safe collector-emitter reverse voltage before breakdown; defines usable supply headroom in negative-rail amplifier stages.
I_C	−150 mA - Continuous collector current rating; sets upper limit for load-driving capability in switching or active-load configurations.
h_FE (Y-class)	350–700 - Guaranteed DC current gain range at V_CE = −6 V, I_C = −1 mA; enables predictable bias point setting without gain trimming.
V_CE(sat)	−0.18 to −0.3 V - Low saturation voltage at I_C = −100 mA, I_B = −10 mA; minimizes power loss and heating in saturated-switch applications.
f_T	50–180 MHz - Current-gain bandwidth product; confirms suitability for audio amplification (≤20 kHz) and low-IF signal processing with margin.
C_ob	2.8 pF - Collector-base output capacitance at V_CB = −10 V; contributes to high-frequency roll-off and affects stability in multi-stage amplifiers.
NF	6.0–20 dB - Noise figure at 1 MHz, R_s = 10 kΩ; indicates acceptable signal-to-noise ratio for low-level preamplifier use.

Pinout & Package

Package: TO-92 (3-lead plastic through-hole), lead configuration: Emitter–Base–Collector (1–2–3), standardized pinout per Fairchild/ON Semiconductor documentation.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current exit terminal for PNP device	Connected to most positive rail in common-emitter or common-base topologies; determines polarity of bias network.
2 (Base)	Control electrode for minority-carrier injection	Receives forward-biased current to regulate collector current; requires current-limiting resistor in discrete driver circuits.
3 (Collector)	Current entry terminal for PNP device	Typically tied to ground or negative supply; forms active load path in amplifier stages or switch outputs.

Key Features

Feature	Design Value
Y-class h_FE binning	Guaranteed 350–700 DC current gain ensures matched pair selection with KSC945 and reduces need for external gain calibration.
Low V_CE(sat)	−0.18 V minimum at rated current enables efficient switching in battery-powered or thermally constrained designs.
Complementary pairing	Explicitly designated as complement to KSC945, supporting balanced differential amplifiers and Class AB output stages.
TO-92 mechanical standardization	Compatible with legacy PCB footprints and automated insertion equipment used for Fairchild/ON Semiconductor small-signal transistors.

Applications

Audio Preamp Stage	Differential Pair Amplifier
Use Scenario: Low-noise voltage amplification of microphone or line-level signals in consumer audio equipment. IC Role / Device Role / Timing Role: PNP small-signal amplifier in common-emitter configuration with emitter degeneration for linearity. Use Value: Y-class h_FE and 6.0 dB NF ensure consistent gain and low added noise; TO-92 allows compact layout near input connectors.	Use Scenario: Input stage of operational transconductance amplifier (OTA) or discrete op-amp requiring matched gain and offset. IC Role / Device Role / Timing Role: One leg of complementary PNP/NPN differential pair (with KSC945), providing balanced small-signal amplification. Use Value: Explicit complement designation and tight h_FE binning enable predictable CMRR and reduced input offset drift.
LED Driver Switch	Current Source Load
Use Scenario: Low-side switching of indicator LEDs or status lights in industrial control panels. IC Role / Device Role / Timing Role: Saturated PNP switch controlling LED anode connection to positive rail. Use Value: −0.18 V V_CE(sat) minimizes power dissipation and self-heating during continuous on-state operation.	Use Scenario: Active current source in constant-current bias networks for JFET or MOSFET gate drive. IC Role / Device Role / Timing Role: Emitter-follower configured as precision current sink with base voltage reference. Use Value: Stable h_FE and low C_ob ensure accurate current mirroring and minimal AC loading on reference node.

Audio Preamp Stage

Differential Pair Amplifier

Use Scenario: Low-noise voltage amplification of microphone or line-level signals in consumer audio equipment.

IC Role / Device Role / Timing Role: PNP small-signal amplifier in common-emitter configuration with emitter degeneration for linearity.

Use Value: Y-class h_FE and 6.0 dB NF ensure consistent gain and low added noise; TO-92 allows compact layout near input connectors.

Use Scenario: Input stage of operational transconductance amplifier (OTA) or discrete op-amp requiring matched gain and offset.

IC Role / Device Role / Timing Role: One leg of complementary PNP/NPN differential pair (with KSC945), providing balanced small-signal amplification.

Use Value: Explicit complement designation and tight h_FE binning enable predictable CMRR and reduced input offset drift.

LED Driver Switch

Current Source Load

Use Scenario: Low-side switching of indicator LEDs or status lights in industrial control panels.

IC Role / Device Role / Timing Role: Saturated PNP switch controlling LED anode connection to positive rail.

Use Value: −0.18 V V_CE(sat) minimizes power dissipation and self-heating during continuous on-state operation.

Use Scenario: Active current source in constant-current bias networks for JFET or MOSFET gate drive.

IC Role / Device Role / Timing Role: Emitter-follower configured as precision current sink with base voltage reference.

Use Value: Stable h_FE and low C_ob ensure accurate current mirroring and minimal AC loading on reference node.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP small-signal transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
KSA733OTA	Same die, O-class h_FE (70–140); lower gain, tighter distribution	Better for fixed-gain, low-variance bias networks where high h_FE isn't required	Select when circuit stability over temperature favors moderate gain with lower spread.
MPSA92	Higher V_CEO (−300 V), same TO-92, h_FE 50–250 (unbinned)	Suitable for higher-voltage switching (e.g., relay drivers), but no Y-class guarantee or KSC945 complement pairing	Choose only when extended breakdown voltage is mandatory and gain consistency is secondary.

Compared with KSA733OTA and MPSA92, the KSA733YTA uniquely delivers guaranteed high h_FE (350–700) alongside explicit complementarity to KSC945-enabling matched-pair design in audio and instrumentation without binning or characterization overhead.

Availability

KSA733YTA is available at Aetrix Electronics and suitable for audio preamplifiers, differential pair amplifiers, and LED driver switches requiring stable component supply, long-term obsolescence management, and consistent parametric performance across production batches.

Supply support for KSA733YTA 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 management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The KSA733YTA belongs to ON Semiconductor's legacy small-signal transistor portfolio inherited from Fairchild, engineered for cost-sensitive, high-reliability linear and switching applications in consumer and industrial electronics.

FAQ

What is the pin configuration of the KSA733YTA?

The KSA733YTA uses a TO-92 package with pin 1 = Emitter, pin 2 = Base, pin 3 = Collector. This configuration is confirmed in the official ON Semiconductor datasheet and matches the standard E-B-C ordering for Fairchild-derived PNP transistors. The KSA733YTA must be mounted with correct orientation to avoid reverse-bias damage or circuit malfunction.

How does the Y-class hFE binning affect circuit design for KSA733YTA?

The Y-class h_FE binning (350–700) of the KSA733YTA guarantees a known minimum and maximum DC current gain at test conditions (V_CE = −6 V, I_C = −1 mA), allowing designers to set stable bias points without iterative testing. This eliminates the need for gain-select resistors or post-manufacture sorting when using the KSA733YTA in production-grade audio or instrumentation circuits.

Is KSA733YTA a direct replacement for older Fairchild KSA733-Y parts?

Yes-the KSA733YTA is the ON Semiconductor–branded continuation of the Fairchild KSA733-Y, retaining identical electrical specifications, TO-92 packaging, pinout, and Y-class h_FE binning. No PCB or schematic changes are required when migrating from legacy Fairchild-labeled KSA733Y parts to the KSA733YTA, as confirmed by ON Semiconductor's integration documentation.

What is the maximum operating temperature for KSA733YTA?

The KSA733YTA has a maximum junction temperature (T_J) of 150°C and a storage temperature range of −55°C to +150°C. Derating is required above 25°C ambient: power dissipation must decrease linearly beyond 25°C at 2.0 mW/°C to maintain safe junction temperatures. This thermal profile makes the KSA733YTA suitable for enclosed industrial enclosures with passive cooling.

Does KSA733YTA have any automotive qualification or AEC-Q200 compliance?

No-the KSA733YTA is not AEC-Q200 qualified and is intended for commercial and industrial applications only. ON Semiconductor does not list this part in its automotive-grade transistor portfolio, and the datasheet contains no stress-test data or qualification reports meeting AEC-Q200 requirements. For automotive use, designers should select explicitly qualified alternatives such as the NSS12201LT1G.

KSA733YTA Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tape & Reel (TR)

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:: 120 @ 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

KSA733YTA FAQ

1.How can I place an order for KSA733YTA through Aetrix?

Please submit a Request for Quotation (RFQ) for KSA733YTA 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 KSA733YTA reliable?

The price and inventory of KSA733YTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSA733YTA is usually 5 days.

3.What payment methods are accepted for KSA733YTA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSA733YTA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KSA733YTA?

KSA733YTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KSA733YTA 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 KSA733YTA?

For technical support, including KSA733YTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSA733YTA requirements.

6.How does Aetrix verify that KSA733YTA is sourced from the original manufacturer or authorized distributors?

All KSA733YTA 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 KSA733YTA meets industry standards.

7.What is the process for return or replacement of KSA733YTA?

All KSA733YTA units undergo pre-shipment inspection (PSI). If there is an issue with KSA733YTA, 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 KSA733YTA part is unused and in its original packaging.

Return procedure for KSA733YTA:

1.Submit a request within 90 days.

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

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