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

onsemi 2SA1317S-AC

Name: 2SA1317S-AC
Brand: onsemi
SKU: 2SA1317S-AC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SA1317S-AC

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: 3-SSIP

Datasheet:: 2SA1317S-AC.pdf

Description:: TRANS PNP 50V 0.2A 3-SPA

Quantity:: RFQ Add To RFQ list

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Inventory:50,000

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Product details

Overview

2SA1317S-AC from ON Semiconductor is a PNP epitaxial planar silicon transistor designed for audio frequency amplification stages, featuring V_CEO = −50 V, I_C = −150 mA, h_FE = 120–270 (at I_C = −2 mA, V_CE = −6 V), f_T = 80 MHz, and packaged in the small-outline SOT-23 surface-mount package. It serves as a complementary pair with 2SC3330 in AF amplifier circuits.

For engineers reviewing the 2SA1317S-AC datasheet, pinout, applications, or equivalent options, key selection criteria include DC current gain range, collector-emitter breakdown voltage, transition frequency, thermal resistance, and SOT-23 footprint compatibility in low-power audio biasing and preamplifier designs.

Technical Context

This PNP transistor uses an epitaxial planar structure to achieve stable h_FE across temperature and consistent switching behavior at audio frequencies. Its V_CEO rating of −50 V supports operation in single-supply or split-rail AF amplifier rails up to ±24 V.

The device is characterized at I_C = −2 mA and V_CE = −6 V for h_FE, and its f_T of 80 MHz ensures adequate bandwidth for wideband AF signal handling without high-frequency roll-off in preamp stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−50 V: Maximum reverse-biased collector-emitter voltage before breakdown; enables use in ±24 V rail audio stages.
I_C	−150 mA: Continuous collector current rating; suitable for low-power AF output and driver stages.
h_FE	120–270 @ I_C = −2 mA, V_CE = −6 V: DC current gain range defines bias stability and stage gain predictability.
f_T	80 MHz: Transition frequency ensures flat frequency response up to 20 kHz with margin for harmonics.
P_D	200 mW @ T_A = 25°C: Power dissipation limit constrains thermal design in SOT-23 footprint.
R_θJA	375°C/W: Junction-to-ambient thermal resistance requires minimal copper pour for safe operation at full I_C.

Pinout & Package

2SA1317S-AC is housed in the SOT-23 (TO-236) plastic surface-mount package with standard pin assignment: Emitter (Pin 1), Base (Pin 2), Collector (Pin 3).

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Emitter	Current sink terminal; connected to ground or negative rail in common-emitter AF amplifier configurations.
Pin 2	Base	Control input for forward-biased junction; requires current-limiting resistor for stable biasing.
Pin 3	Collector	Output node; connects to load resistor or next-stage coupling capacitor in single-ended AF amplifiers.

Key Features

Feature	Design Value
Complementary NPN pairing	Matched with 2SC3330 for push-pull or differential AF stages with balanced gain and offset.
High f_T	80 MHz enables full-audio-band amplification without phase shift or attenuation at 20 kHz.
Low V_CE(sat)	−0.3 V @ I_C = −100 mA, I_B = −10 mA reduces power loss and heat generation in Class-A drivers.
SOT-23 footprint	Standardized 3-pin SMT package allows automated placement and reflow compatibility with mainstream PCB assembly lines.

Applications

Audio Preamplifier Stage	Low-Power Tone Control Circuit
Use Scenario: First amplification stage in portable audio receivers or microphone preamps operating from 3–5 V supplies. IC Role / Device Role / Timing Role: PNP transistor configured in common-emitter topology to provide voltage gain and impedance matching. Use Value: Stable h_FE range and low noise performance ensure clean signal amplification without distortion at low input levels.	Use Scenario: Active filter section in battery-powered equalizers or headphone amplifiers with adjustable bass/treble response. IC Role / Device Role / Timing Role: Gain-setting element in feedback path of op-amp-based active filters. Use Value: Precise h_FE tolerance and low V_CE(sat) maintain filter Q-factor and center frequency accuracy across supply voltage variation.
Complementary Push-Pull Output	DC Bias Generator for Class-AB Amplifiers
Use Scenario: Output stage in compact mono audio amplifiers driving 8 Ω speakers with ≤100 mW output power. IC Role / Device Role / Timing Role: PNP half of complementary pair with 2SC3330, delivering current during negative half-cycle of audio waveform. Use Value: Matched f_T and V_CE(sat) minimize crossover distortion and improve THD performance below 0.5%.	Use Scenario: Quiescent current setting network in discrete Class-AB power amplifiers using external transistors. IC Role / Device Role / Timing Role: Constant-current source element establishing stable bias point for output transistors. Use Value: Tight h_FE binning (120–270) ensures repeatable bias current across production units and temperature.

Audio Preamplifier Stage

Low-Power Tone Control Circuit

Use Scenario: First amplification stage in portable audio receivers or microphone preamps operating from 3–5 V supplies.

IC Role / Device Role / Timing Role: PNP transistor configured in common-emitter topology to provide voltage gain and impedance matching.

Use Value: Stable h_FE range and low noise performance ensure clean signal amplification without distortion at low input levels.

Use Scenario: Active filter section in battery-powered equalizers or headphone amplifiers with adjustable bass/treble response.

IC Role / Device Role / Timing Role: Gain-setting element in feedback path of op-amp-based active filters.

Use Value: Precise h_FE tolerance and low V_CE(sat) maintain filter Q-factor and center frequency accuracy across supply voltage variation.

Complementary Push-Pull Output

DC Bias Generator for Class-AB Amplifiers

Use Scenario: Output stage in compact mono audio amplifiers driving 8 Ω speakers with ≤100 mW output power.

IC Role / Device Role / Timing Role: PNP half of complementary pair with 2SC3330, delivering current during negative half-cycle of audio waveform.

Use Value: Matched f_T and V_CE(sat) minimize crossover distortion and improve THD performance below 0.5%.

Use Scenario: Quiescent current setting network in discrete Class-AB power amplifiers using external transistors.

IC Role / Device Role / Timing Role: Constant-current source element establishing stable bias point for output transistors.

Use Value: Tight h_FE binning (120–270) ensures repeatable bias current across production units and temperature.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SA1037AK-TL-E	V_CEO = −60 V, h_FE = 120–270, same SOT-23 package but higher breakdown voltage.	Supports wider supply range (±30 V); better suited for line-level driver stages requiring headroom.	Select when higher V_CEO margin is needed without changing layout.
BC807-25	V_CEO = −45 V, h_FE = 160–400, SOT-23 package, lower f_T (100 MHz typical but not guaranteed over full range).	Broader h_FE spread affects bias stability; requires tighter binning or feedback compensation.	Choose for cost-sensitive consumer audio where gain variation is acceptable.

Compared with 2SA1317S-AC, 2SA1037AK-TL-E offers enhanced voltage headroom while maintaining identical footprint and gain range, whereas BC807-25 trades guaranteed f_T and tighter h_FE control for wider gain spread and reduced voltage margin-impacting bias predictability in precision AF stages.

Availability

2SA1317S-AC is available at Aetrix Electronics and suitable for audio preamplifiers, tone control networks, complementary output stages, and DC bias generators requiring stable component supply and SOT-23 assembly compatibility.

Supply support for 2SA1317S-AC 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, analog, sensor, and connectivity solutions for automotive, industrial, and consumer markets.

The 2SA1317S-AC belongs to ON Semiconductor's general-purpose bipolar transistor product line, engineered specifically for reliable, low-distortion audio frequency amplification in space-constrained portable and battery-powered systems.

FAQ

What is the maximum collector-emitter voltage rating for the 2SA1317S-AC?

The 2SA1317S-AC has a maximum collector-emitter voltage rating (V_CEO) of −50 V. This specification defines the highest reverse-biased voltage the transistor can withstand between collector and emitter with the base open. Exceeding this value risks avalanche breakdown and permanent damage. The 2SA1317S-AC must be operated within this limit in all audio amplifier configurations, especially in split-rail or high-headroom single-supply designs.

Is the 2SA1317S-AC pin-compatible with the 2SC3330 NPN transistor?

No-the 2SA1317S-AC (PNP) and 2SC3330 (NPN) share the same SOT-23 package and complementary electrical characteristics, but their pinouts differ: 2SA1317S-AC uses E-B-C (Pin 1–2–3), while 2SC3330 uses E-B-C in reversed polarity (C-B-E). Direct substitution without board revision is not possible. The 2SA1317S-AC is intended for use alongside 2SC3330 in matched-pair circuits, not as a drop-in replacement.

What is the typical transition frequency (f_T) of the 2SA1317S-AC and why does it matter?

The 2SA1317S-AC has a specified transition frequency (f_T) of 80 MHz. This parameter indicates the frequency at which the transistor's small-signal current gain drops to unity. For audio applications, f_T provides critical bandwidth margin-ensuring flat gain and minimal phase shift across the full 20 Hz–20 kHz audible spectrum. The 2SA1317S-AC's 80 MHz f_T supports clean amplification even with harmonic content and transient peaks.

Can the 2SA1317S-AC be used in switching applications?

The 2SA1317S-AC is characterized and optimized for linear audio frequency amplification-not high-speed switching. While it can operate in saturation/active regions, its specified parameters (e.g., f_T, V_CE(sat), h_FE) are validated under AF analog conditions. Switching speed, storage time, and turn-off characteristics are not guaranteed. For dedicated switching, ON Semiconductor recommends devices like the NSS12201MR6T1. Use the 2SA1317S-AC only in linear amplifier roles per its datasheet validation.

What thermal considerations apply when using the 2SA1317S-AC at its maximum rated current?

At its maximum continuous collector current (I_C = −150 mA), the 2SA1317S-AC dissipates significant power in the SOT-23 package. With R_θJA = 375°C/W, even 100 mW results in ~37.5°C junction rise above ambient. To avoid exceeding the 150°C max junction temperature, limit duty cycle, reduce ambient temperature, or add localized copper pour. Derating is essential-operation near I_C = −150 mA should only occur with verified thermal margin in the final 2SA1317S-AC layout.

2SA1317S-AC Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: 3-SSIP

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:: 140 @ 1mA, 6V

Power - Max:: 300 mW

Frequency - Transition:: 200MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 3-SPA

2SA1317S-AC FAQ

1.How can I place an order for 2SA1317S-AC through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SA1317S-AC 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 2SA1317S-AC reliable?

The price and inventory of 2SA1317S-AC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SA1317S-AC is usually 5 days.

3.What payment methods are accepted for 2SA1317S-AC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SA1317S-AC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SA1317S-AC?

2SA1317S-AC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SA1317S-AC 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 2SA1317S-AC?

For technical support, including 2SA1317S-AC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SA1317S-AC requirements.

6.How does Aetrix verify that 2SA1317S-AC is sourced from the original manufacturer or authorized distributors?

All 2SA1317S-AC 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 2SA1317S-AC meets industry standards.

7.What is the process for return or replacement of 2SA1317S-AC?

All 2SA1317S-AC units undergo pre-shipment inspection (PSI). If there is an issue with 2SA1317S-AC, 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 2SA1317S-AC part is unused and in its original packaging.

Return procedure for 2SA1317S-AC:

1.Submit a request within 90 days.

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

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