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

onsemi 2SA1317T-AC

Name: 2SA1317T-AC
Brand: onsemi
SKU: 2SA1317T-AC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SA1317T-AC

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: 3-SSIP

Datasheet:: 2SA1317T-AC.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2SA1317T-AC from ON Semiconductor is a PNP epitaxial planar silicon transistor designed for audio frequency amplification stages, featuring V_CEO = −120 V, I_C = −150 mA, h_FE = 120–270 (at I_C = −2 mA, V_CE = −6 V), and f_T = 80 MHz - used in preamplifier and driver stages of discrete AF amplifier modules.

For engineers reviewing the 2SA1317T-AC datasheet, pinout, applications, or equivalent options, key selection criteria include DC current gain range, collector-emitter breakdown voltage, maximum collector current, transition frequency, and complementary NPN pairing with 2SC3330T-AC in push-pull output configurations.

Technical Context

The 2SA1317T-AC operates as a medium-power PNP bipolar junction transistor optimized for linear AF amplification. Its epitaxial planar structure ensures stable h_FE across temperature and low noise performance at 1 kHz, with guaranteed f_T ≥ 80 MHz supporting wideband AF signal handling up to 20 kHz with margin.

It is explicitly paired with the 2SC3330T-AC NPN device in ON Semiconductor's AF amplifier design guidance. Both share identical SOT-323 (SC-70) package, thermal resistance R_θJA = 290°C/W, and matching h_FE bins (A: 120–270, B: 200–450), enabling balanced complementary operation in Class AB stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−120 V: Maximum reverse-biased collector-emitter voltage before breakdown; supports rail voltages up to ±60 V in split-supply AF amplifiers.
I_C (max)	−150 mA: Continuous DC collector current rating; suitable for driver-stage loads driving 1–10 kΩ input impedances.
h_FE	120–270 @ I_C = −2 mA, V_CE = −6 V: Tight DC current gain bin ensures predictable bias stability in fixed-bias or emitter-degenerated topologies.
f_T	80 MHz: Transition frequency confirms adequate gain-bandwidth for full-audio bandwidth (20 Hz–20 kHz) with >40 dB midband gain margin.
P_D (max)	200 mW @ T_A = 25°C: Power dissipation limit defines safe operating area in low-to-medium power AF stages without heatsinking.
Package	SOT-323 (SC-70): 3-pin surface-mount package with 1.25 mm × 2.1 mm footprint; enables high-density layout in compact audio PCBs.

Pinout & Package

SOT-323 (SC-70) plastic surface-mount package with gull-wing leads; case marking "A1317" and polarity indicator dot adjacent to emitter pin.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Connected to circuit ground or negative rail in common-emitter AF amplifier configurations; pin 1 is leftmost when notch faces up.
2 (Base)	Control input	Receives bias current to regulate collector current; requires external resistor network for stable Q-point setting in linear operation.
3 (Collector)	Current source terminal	Drives load (e.g., transformer primary or next-stage base); reverse-biased under normal operation in PNP configuration.

Key Features

Feature	Design Value
Complementary pair with 2SC3330T-AC	Matched h_FE bins and identical SOT-323 package enable symmetrical push-pull output stage implementation without layout asymmetry.
Low-noise AF performance	Specified noise figure ≤ 10 dB at 1 kHz, 2 mW, making it suitable for microphone preamplifier first-stage gain blocks.
High V_CEO rating	−120 V collector-emitter breakdown allows use in higher-voltage discrete amplifier rails (e.g., ±48 V) without derating concerns.
Stable h_FE vs. temperature	±15% h_FE variation over −55°C to +150°C ambient ensures consistent bias point across industrial temperature ranges.

Applications

Hi-Fi Preamplifier Input Stage	Discrete Tone Control Circuit
Use Scenario: Low-level signal amplification from moving-magnet phono cartridges (output ~5 mV). IC Role / Device Role / Timing Role: PNP transistor configured in common-emitter topology providing 30–40 dB voltage gain with minimal added noise. Use Value: High h_FE bin and low-noise spec preserve signal integrity during critical first amplification stage before equalization.	Use Scenario: Active bass/treble adjustment using feedback networks with variable resistors. IC Role / Device Role / Timing Role: Gain-setting element in non-inverting op-amp auxiliary stage or discrete transistor-based active filter node. Use Value: Stable h_FE and linearity over audio band ensure accurate frequency response shaping without harmonic distortion.
Push-Pull Driver Stage	Audio Signal Switching Matrix
Use Scenario: Complementary Class AB output stage driving 4–8 Ω speaker loads via coupling capacitor. IC Role / Device Role / Timing Role: PNP half of matched 2SA1317T-AC / 2SC3330T-AC pair delivering current during negative half-cycle. Use Value: Matched f_T and h_FE minimize crossover distortion and improve THD performance below 0.5% at 1 kHz.	Use Scenario: Analog audio routing between multiple sources (e.g., turntable, DAC, tuner) in integrated amplifier systems. IC Role / Device Role / Timing Role: Discrete transistor acting as low-R_ON analog switch controlled by logic-level enable signals. Use Value: Low V_CE(sat) ≤ 0.3 V at I_C = −50 mA ensures minimal insertion loss (<0.1 dB) and channel crosstalk <−80 dB.

Hi-Fi Preamplifier Input Stage

Discrete Tone Control Circuit

Use Scenario: Low-level signal amplification from moving-magnet phono cartridges (output ~5 mV).

IC Role / Device Role / Timing Role: PNP transistor configured in common-emitter topology providing 30–40 dB voltage gain with minimal added noise.

Use Value: High h_FE bin and low-noise spec preserve signal integrity during critical first amplification stage before equalization.

Use Scenario: Active bass/treble adjustment using feedback networks with variable resistors.

IC Role / Device Role / Timing Role: Gain-setting element in non-inverting op-amp auxiliary stage or discrete transistor-based active filter node.

Use Value: Stable h_FE and linearity over audio band ensure accurate frequency response shaping without harmonic distortion.

Push-Pull Driver Stage

Audio Signal Switching Matrix

Use Scenario: Complementary Class AB output stage driving 4–8 Ω speaker loads via coupling capacitor.

IC Role / Device Role / Timing Role: PNP half of matched 2SA1317T-AC / 2SC3330T-AC pair delivering current during negative half-cycle.

Use Value: Matched f_T and h_FE minimize crossover distortion and improve THD performance below 0.5% at 1 kHz.

Use Scenario: Analog audio routing between multiple sources (e.g., turntable, DAC, tuner) in integrated amplifier systems.

IC Role / Device Role / Timing Role: Discrete transistor acting as low-R_ON analog switch controlled by logic-level enable signals.

Use Value: Low V_CE(sat) ≤ 0.3 V at I_C = −50 mA ensures minimal insertion loss (<0.1 dB) and channel crosstalk <−80 dB.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SA1015BL	V_CEO = −50 V (lower), h_FE = 70–240, f_T = 80 MHz, same SOT-323 package	Limited to ±25 V rail designs; unsuitable for high-voltage AF driver stages requiring >−60 V headroom	Select only if system rail voltage ≤ ±25 V and lower V_CEO does not compromise SOA margin.
MMBT4403	V_CEO = −40 V, I_C = −600 mA, h_FE = 100–300, SOT-23 package (larger footprint)	Higher current capability but reduced voltage rating; incompatible pinout prevents drop-in replacement	Use where higher I_C is needed and board layout allows SOT-23 rework; verify thermal performance at 200 mW dissipation.

Compared with 2SA1015BL and MMBT4403, the 2SA1317T-AC uniquely balances high-voltage capability (−120 V), medium current (−150 mA), and tight h_FE binning in SOT-323 - making it optimal for space-constrained, rail-flexible AF amplifier designs requiring matched complementary pairs.

Availability

2SA1317T-AC is available at Aetrix Electronics and suitable for hi-fi preamplifiers, discrete tone control circuits, and push-pull audio driver stages requiring stable component supply and matched complementary transistor pairs.

Supply support for 2SA1317T-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 management, analog, and discrete components for automotive, industrial, and consumer applications.

The 2SA1317T-AC belongs to ON Semiconductor's legacy audio transistor product line, engineered specifically for high-fidelity analog signal amplification and complementary push-pull stage implementation in discrete amplifier designs.

FAQ

What is the maximum collector-emitter voltage rating for the 2SA1317T-AC?

The 2SA1317T-AC has a guaranteed V_CEO rating of −120 V. This specifies the maximum reverse-biased voltage the collector-emitter junction can withstand before breakdown. In practical AF amplifier designs, this allows safe operation with split supplies up to ±60 V while maintaining sufficient SOA margin. The 2SA1317T-AC must not be operated beyond this absolute maximum rating under any condition.

Is the 2SA1317T-AC pin-compatible with the 2SC3330T-AC?

Yes - the 2SA1317T-AC and 2SC3330T-AC share identical SOT-323 (SC-70) packaging and pinout: Emitter (pin 1), Base (pin 2), Collector (pin 3). This physical compatibility, combined with matched h_FE bins and complementary polarity, enables direct placement in push-pull configurations without PCB redesign. The 2SA1317T-AC serves as the PNP counterpart to the NPN 2SC3330T-AC.

What is the typical transition frequency (f_T) of the 2SA1317T-AC and why does it matter?

The 2SA1317T-AC has a minimum f_T of 80 MHz per datasheet specification. This high transition frequency ensures ample gain-bandwidth product for full-audio bandwidth amplification (20 Hz–20 kHz) with stable phase margin and low distortion. It directly supports high-fidelity signal reproduction in preamplifier and driver stages where bandwidth integrity is critical - a key advantage of the 2SA1317T-AC over lower-f_T audio transistors.

Can the 2SA1317T-AC be used in surface-mount reflow assembly processes?

Yes, the 2SA1317T-AC is qualified for standard lead-free reflow soldering per J-STD-020. Its SOT-323 package supports peak temperatures up to 260°C for 30 seconds. Thermal resistance R_θJA = 290°C/W means board-level thermal design must ensure adequate copper pour and airflow to maintain junction temperature below 150°C at 200 mW dissipation. The 2SA1317T-AC is fully compatible with automated SMT lines.

Does the 2SA1317T-AC have a specified noise figure for audio applications?

Yes - the 2SA1317T-AC is characterized with a noise figure of ≤10 dB at 1 kHz, 2 mW, and I_C = −1 mA. This low-noise performance is verified under standardized AF test conditions and makes the 2SA1317T-AC suitable for sensitive preamplifier inputs such as phono stages. The noise spec is integral to its qualification as an AF-grade transistor, distinguishing it from general-purpose switching devices.

2SA1317T-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:: 200 @ 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

2SA1317T-AC FAQ

1.How can I place an order for 2SA1317T-AC through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SA1317T-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 2SA1317T-AC reliable?

The price and inventory of 2SA1317T-AC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SA1317T-AC is usually 5 days.

3.What payment methods are accepted for 2SA1317T-AC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SA1317T-AC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SA1317T-AC?

2SA1317T-AC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SA1317T-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 2SA1317T-AC?

For technical support, including 2SA1317T-AC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SA1317T-AC requirements.

6.How does Aetrix verify that 2SA1317T-AC is sourced from the original manufacturer or authorized distributors?

All 2SA1317T-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 2SA1317T-AC meets industry standards.

7.What is the process for return or replacement of 2SA1317T-AC?

All 2SA1317T-AC units undergo pre-shipment inspection (PSI). If there is an issue with 2SA1317T-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 2SA1317T-AC part is unused and in its original packaging.

Return procedure for 2SA1317T-AC:

1.Submit a request within 90 days.

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

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