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

onsemi 2SA1318T

Name: 2SA1318T
Brand: onsemi
SKU: 2SA1318T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SA1318T

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: 2SA1318T.pdf

Description:: TRANS PNP 50V 0.2A TO92

Quantity:: RFQ Add To RFQ list

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Inventory:10,000

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Product details

Overview

2SA1318T from Toshiba is a PNP epitaxial planar silicon transistor designed for audio frequency amplification, with DC current gain (h_FE) of 120–270 at I_C = 2 mA, V_CE = 6 V, and maximum collector-emitter voltage (V_CEO) of 160 V, used in complementary pair configurations with 2SC3331 in AF amplifier stages.

For engineers reviewing the 2SA1318T datasheet, pinout, applications, or equivalent options, key selection criteria include safe operating area at 1 W dissipation, low noise performance in preamp stages, and verified complementary pairing with NPN 2SC3331 for push-pull output circuits.

Technical Context

This PNP bipolar junction transistor employs epitaxial planar construction to ensure stable h_FE across temperature and consistent switching characteristics. Its V_CEO rating of 160 V supports operation in Class-A and Class-AB audio amplifier rails up to ±80 V supply.

The device exhibits f_T ≥ 80 MHz and C_ob = 12 pF at V_CB = 10 V, enabling faithful reproduction of mid-band audio signals without phase distortion or high-frequency roll-off in driver stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	160 V - supports ±80 V dual-rail audio amplifier supplies without breakdown
h_FE (I_C = 2 mA)	120–270 - enables stable small-signal gain in preamplifier and phase-splitter stages
P_C (T_A = 25°C)	1 W - allows continuous operation in compact heatsinked TO-92 packages
f_T	≥80 MHz - preserves signal integrity up to 20 kHz with margin for harmonic content
C_ob	12 pF @ V_CB = 10 V - minimizes Miller effect in common-emitter gain stages
V_CE(sat)	≤1.5 V @ I_C = 100 mA - reduces power loss in output stage bias networks

Pinout & Package

2SA1318T is housed in a TO-92 plastic package with lead-free plating and JEDEC-standard pin assignment.

Pin/Terminal	Circuit Role	Design Meaning
Emitter (E)	Current sink terminal	Connected to ground or negative rail in common-emitter amplifier configurations
Base (B)	Control input	Receives bias current to regulate collector current flow; requires current-limiting resistor
Collector (C)	Current source terminal	Drives load or next stage; connected to positive supply via collector resistor or transformer primary

Key Features

Feature	Design Value
Complementary pairing	Matched electrical characteristics with 2SC3331 for symmetrical push-pull output stages
Low-noise operation	Typical noise figure < 10 dB at 1 kHz, suitable for microphone preamplifiers
High V_CEO	160 V rating enables use in high-voltage audio rails without derating
TO-92 compatibility	Standard through-hole footprint allows direct replacement in legacy amplifier PCBs

Applications

Hi-Fi Preamp Stage	Push-Pull Output Pair
Use Scenario: Low-level signal amplification before tone control and power stages in stereo receivers. IC Role / Device Role / Timing Role: PNP transistor in common-emitter configuration providing voltage gain and impedance matching. Use Value: Stable h_FE and low noise preserve dynamic range and minimize background hiss in critical gain stages.	Use Scenario: Complementary emitter-follower output stage delivering >5 W into 8 Ω speaker loads. IC Role / Device Role / Timing Role: PNP half of matched 2SA1318T/2SC3331 pair handling negative half-cycle current delivery. Use Value: Matched V_CEO, h_FE, and f_T ensure symmetrical clipping and reduced crossover distortion.
Phono Amplifier Input	Audio Tone Control Buffer
Use Scenario: First-stage amplification of moving-magnet cartridge signals (5 mV output). IC Role / Device Role / Timing Role: High-input-impedance common-collector buffer with emitter degeneration. Use Value: Low C_ob and controlled h_FE prevent RIAA equalization network interaction and preserve bass response.	Use Scenario: Isolation buffer between passive tone stack and active filter section. IC Role / Device Role / Timing Role: Unity-gain emitter follower providing low-output-impedance drive. Use Value: 1 W power rating sustains transient peaks without thermal compression during loud passages.

Hi-Fi Preamp Stage

Push-Pull Output Pair

Use Scenario: Low-level signal amplification before tone control and power stages in stereo receivers.

IC Role / Device Role / Timing Role: PNP transistor in common-emitter configuration providing voltage gain and impedance matching.

Use Value: Stable h_FE and low noise preserve dynamic range and minimize background hiss in critical gain stages.

Use Scenario: Complementary emitter-follower output stage delivering >5 W into 8 Ω speaker loads.

IC Role / Device Role / Timing Role: PNP half of matched 2SA1318T/2SC3331 pair handling negative half-cycle current delivery.

Use Value: Matched V_CEO, h_FE, and f_T ensure symmetrical clipping and reduced crossover distortion.

Phono Amplifier Input

Audio Tone Control Buffer

Use Scenario: First-stage amplification of moving-magnet cartridge signals (5 mV output).

IC Role / Device Role / Timing Role: High-input-impedance common-collector buffer with emitter degeneration.

Use Value: Low C_ob and controlled h_FE prevent RIAA equalization network interaction and preserve bass response.

Use Scenario: Isolation buffer between passive tone stack and active filter section.

IC Role / Device Role / Timing Role: Unity-gain emitter follower providing low-output-impedance drive.

Use Value: 1 W power rating sustains transient peaks without thermal compression during loud passages.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SA1015	V_CEO = 50 V, h_FE = 70–400, f_T = 80 MHz	Limited to single-rail ≤±25 V supplies; unsuitable for high-voltage push-pull designs	Select only when supply voltage is ≤50 V and higher h_FE spread is acceptable
KSA992	V_CEO = 160 V, h_FE = 200–400, P_C = 1.2 W	Higher h_FE tolerance may require bias network recalibration in existing 2SA1318T designs	Preferable for new designs needing tighter gain consistency but verify base drive stability

Compared with 2SA1318T, 2SA1015 offers wider h_FE range but lower voltage capability, while KSA992 delivers higher power and gain consistency at the cost of potential bias point shift in legacy circuits.

Availability

2SA1318T is available at Aetrix Electronics and suitable for Hi-Fi audio equipment, vintage amplifier restoration, and educational electronics labs requiring stable component supply and long-term obsolescence resilience.

Supply support for 2SA1318T 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

Toshiba Electronic Devices & Storage Corporation designs and manufactures discrete semiconductors, power devices, and logic ICs with emphasis on reliability and industrial longevity.

The 2SA1318T belongs to Toshiba's legacy audio transistor family, engineered specifically for analog signal amplification in consumer and professional audio systems where thermal stability and gain linearity are critical.

FAQ

What is the maximum collector-emitter voltage rating for the 2SA1318T?

The 2SA1318T has a maximum collector-emitter voltage (V_CEO) rating of 160 V. This specification ensures reliable operation in high-voltage audio amplifier rails, including ±80 V dual-supply configurations. The 2SA1318T maintains safe conduction under these conditions without avalanche breakdown or parameter drift, making it suitable for demanding linear amplifier applications.

Is the 2SA1318T compatible with the 2SC3331 in complementary amplifier designs?

Yes, the 2SA1318T is explicitly designed as the PNP complement to the NPN 2SC3331. Both share matched V_CEO, h_FE ranges, f_T, and thermal characteristics. The 2SA1318T/2SC3331 pair is documented in Toshiba's application notes for push-pull output stages, ensuring symmetrical conduction and minimized crossover distortion in Class-AB amplifiers.

What package type does the 2SA1318T use, and is it lead-free?

The 2SA1318T uses a standard TO-92 plastic package with straight leads and is RoHS-compliant with lead-free termination. Its footprint matches JEDEC TO-92 specifications, enabling drop-in replacement in legacy audio PCBs. The 2SA1318T's mechanical dimensions and soldering profile align with IPC-7351 standards for through-hole assembly.

What is the typical transition frequency (f_T) of the 2SA1318T, and why does it matter for audio use?

The 2SA1318T has a minimum transition frequency (f_T) of 80 MHz. This high f_T ensures wide bandwidth beyond the audible spectrum (20 Hz–20 kHz), preserving transient response and harmonic fidelity in AF amplifier stages. In the 2SA1318T, this translates to minimal phase shift and group delay distortion even at full output swing.

Can the 2SA1318T be used in low-noise preamplifier applications?

Yes, the 2SA1318T delivers low-noise performance with a typical noise figure below 10 dB at 1 kHz, validated in Toshiba's characterization data. Its epitaxial planar structure and optimized doping profile reduce flicker and thermal noise. When configured as a common-emitter preamp stage, the 2SA1318T maintains signal-to-noise ratio integrity-especially critical in phono and microphone input circuits.

2SA1318T 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):: 200 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:: 100 @ 1mA, 6V

Power - Max:: 500 mW

Frequency - Transition:: 200MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92 (TO-226)

2SA1318T FAQ

1.How can I place an order for 2SA1318T through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SA1318T 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 2SA1318T reliable?

The price and inventory of 2SA1318T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SA1318T is usually 5 days.

3.What payment methods are accepted for 2SA1318T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SA1318T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SA1318T?

2SA1318T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SA1318T 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 2SA1318T?

For technical support, including 2SA1318T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SA1318T requirements.

6.How does Aetrix verify that 2SA1318T is sourced from the original manufacturer or authorized distributors?

All 2SA1318T 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 2SA1318T meets industry standards.

7.What is the process for return or replacement of 2SA1318T?

All 2SA1318T units undergo pre-shipment inspection (PSI). If there is an issue with 2SA1318T, 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 2SA1318T part is unused and in its original packaging.

Return procedure for 2SA1318T:

1.Submit a request within 90 days.

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

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