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

STMicroelectronics 2STA1695

Name: 2STA1695
Brand: STMicroelectronics
SKU: 2STA1695
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2STA1695

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-3P-3, SC-65-3

Datasheet:: 2STA1695.pdf

Description:: TRANS PNP 140V 10A TO-3P

Quantity:: RFQ Add To RFQ list

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Inventory:6,104

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Product details

Overview

2STA1695 from STMicroelectronics is a high-power PNP epitaxial planar bipolar transistor designed for audio power amplifier output stages, featuring V_CEO = −140 V, I_C = −10 A, P_tot = 100 W at T_c = 25 °C, f_T = 20 MHz, and R_thj-case = 1.25 °C/W - optimized for 70–100 W high-fidelity audio amplifiers.

For engineers reviewing the 2STA1695 datasheet, 2STA1695 pinout, 2STA1695 application, or 2STA1695 equivalent, key selection criteria include safe operating area at elevated junction temperature (T_J ≤ 150 °C), low V_CE(sat) (−0.5 V @ −5 A/−500 mA), complementary pairing with 2STC4468, and TO-3P package thermal performance in linear amplifier designs.

Technical Context

This PNP transistor uses ST's BiT-LA (Bipolar transistor for linear amplifier) process to achieve high gain linearity and stable h_FE (70–140 at −3 A/−5 A, V_CE = −4 V), critical for low-distortion audio output stages. Its −140 V breakdown ratings (V_CBO, V_CEO) support high-rail Class AB operation in discrete power amplifier topologies.

The device is fully characterized up to T_case = 125 °C and exhibits robust switching behavior: t_on = 0.24 µs, t_stg = 1.2 µs, t_f = 0.24 µs under resistive load (V_CC = −60 V, I_B1 = I_B2 = −0.5 A), enabling reliable use in quasi-complementary or push-pull output configurations.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−140 V: Enables operation with ±70 V rails in high-fidelity audio amplifiers without breakdown risk.
I_C (continuous)	−10 A: Supports ≥70 W RMS output into 4 Ω loads in Class AB configurations.
P_tot @ T_c = 25 °C	100 W: Requires heatsink with thermal resistance ≤ 1.25 °C/W to maintain T_J ≤ 150 °C.
h_FE	70–140 @ −3 A to −5 A: Ensures stable bias current control and low THD in linear output stages.
f_T	20 MHz: Sufficient bandwidth for full-audio-spectrum amplification (20 Hz–20 kHz) with margin.
R_thj-case	1.25 °C/W max: Dictates minimum heatsink performance for continuous high-power operation.
V_CE(sat)	−0.5 V @ −5 A/−500 mA: Minimizes conduction loss and thermal stress in output stage quiescent operation.

Pinout & Package

Supplied in TO-3P package: metal-can outline with isolated collector tab, 3-pin through-hole configuration, standardized for high-power thermal mounting. Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector (tab-connected).

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Emitter	Main current exit path; connected to negative rail or emitter resistor in common-emitter amplifier stage.
Pin 2	Base	Current-controlled input node; requires precise bias network for stable Q-point in linear operation.
Pin 3	Collector (tab)	Main current entry path; electrically tied to metal case for direct heatsink mounting and low-inductance thermal path.

Key Features

Feature	Design Value
BiT-LA process technology	Delivers superior gain linearity (h_FE flatness over I_C) to minimize harmonic distortion in audio output stages.
Full 125 °C characterization	Guarantees electrical parameters remain within spec under sustained high-temperature operation in enclosed enclosures.
Complementary pairing with 2STC4468	Enables matched NPN/PNP push-pull output stages with symmetrical V_CEO, h_FE, and thermal profiles.
Low storage time (t_stg = 1.2 µs)	Reduces switching distortion and improves transient response in high-slew-rate audio amplifiers.

Applications

High-Fidelity Stereo Amplifier

Professional Audio Power Module

Use Scenario: Discrete Class AB output stage delivering 80 W RMS per channel into 4 Ω loads with <0.05% THD+N.

IC Role / Device Role / Timing Role: PNP output transistor in complementary pair with 2STC4468, handling negative half-cycle current swing.

Use Value: High V_CEO and low V_CE(sat) enable efficient high-voltage rail operation while minimizing heat generation and crossover distortion.

Use Scenario: Modular 100 W audio power stage used in touring PA system rack amplifiers.

IC Role / Device Role / Timing Role: Primary PNP output switch in quasi-complementary topology, mounted on forced-air-cooled heatsink.

Use Value: R_thj-case = 1.25 °C/W and 150 °C max T_J allow sustained full-power operation under ambient temperatures up to 55 °C.

Studio Monitor Output Stage

Hi-Fi Integrated Amplifier

Use Scenario: Dual-mono active studio monitor with discrete output stage per channel, requiring ultra-low noise and wide bandwidth.

IC Role / Device Role / Timing Role: Final PNP gain device in DC-coupled output path, biased for optimal linearity at 100 mA quiescent current.

Use Value: f_T = 20 MHz and flat h_FE curve ensure stable open-loop gain and phase margin across 20 Hz–100 kHz.

Use Scenario: Compact integrated amplifier delivering 70 W/channel with minimal external components.

IC Role / Device Role / Timing Role: PNP output transistor in single-ended Class A/AB hybrid design, thermally coupled to chassis-mounted heatsink.

Use Value: TO-3P mechanical robustness and −140 V rating permit simplified power supply design with reduced filtering requirements.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJE15034	V_CEO = −150 V, h_FE = 20–70 (lower gain range), R_thj-case = 1.5 °C/W	Higher voltage margin but reduced linearity and thermal efficiency vs. 2STA1695	Prefer where higher breakdown is critical and gain matching less essential.
BD139	V_CEO = −80 V, P_tot = 12.5 W, TO-126 package	Not suitable for >30 W applications; lacks thermal capability and voltage rating	Only acceptable for low-power pre-driver or small-signal stages - not a true replacement.

Compared with MJE15034 and BD139, the 2STA1695 offers superior gain linearity, lower thermal resistance, and tighter parameter distribution across temperature - making it the preferred choice for high-fidelity 70–100 W output stages where distortion and thermal stability are critical.

Availability

2STA1695 is available at Aetrix Electronics and suitable for high-fidelity stereo amplifiers, professional audio power modules, and studio monitor output stages requiring stable component supply and long-term manufacturability.

Supply support for 2STA1695 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, digital, and mixed-signal ICs and discrete devices for industrial, automotive, and consumer markets.

The 2STA1695 belongs to ST's BiT-LA bipolar transistor product line, engineered specifically for high-linearity, high-power audio amplifier output stages with emphasis on thermal reliability and gain consistency.

FAQ

Is the 2STA1695 RoHS-compliant and lead-free?

Yes. The 2STA1695 is manufactured in ST's ECOPACK®-compliant TO-3P package, meeting RoHS Directive 2011/65/EU requirements with lead-free terminations and halogen-free molding compound. Full compliance documentation is available via ST's quality portal.

What is the recommended heatsink interface for the TO-3P package?

Use electrically insulating but thermally conductive material (e.g., mica washer + thermal grease or ceramic insulator) between the collector-tab and heatsink. Mounting torque must not exceed 0.5 N·m to avoid case deformation and internal bond-wire damage.

Can the 2STA1695 be used in switching power supplies?

No. Though it exhibits defined switching times (t_on/t_f < 0.3 µs), its BiT-LA process prioritizes linearity over speed, and safe operating area is optimized for linear amplifier duty cycles-not repetitive hard-switching. Use ST's MDmesh™ MOSFETs for SMPS applications.

How does the 2STA1695 compare to the 2N3055 in audio applications?

The 2STA1695 offers significantly higher V_CEO (−140 V vs. −60 V), lower R_thj-case (1.25 °C/W vs. ~2.5 °C/W), and superior h_FE linearity - enabling higher-power, lower-distortion, and more thermally efficient audio output stages than legacy 2N3055-based designs.

2STA1695 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-3P-3, SC-65-3

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 10 A

Voltage - Collector Emitter Breakdown (Max):: 140 V

Vce Saturation (Max) @ Ib, Ic:: 700mV @ 700mA, 7A

Current - Collector Cutoff (Max):: 100nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 70 @ 3A, 4V

Power - Max:: 100 W

Frequency - Transition:: 20MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-3P

2STA1695 FAQ

1.How can I place an order for 2STA1695 through Aetrix?

Please submit a Request for Quotation (RFQ) for 2STA1695 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 2STA1695 reliable?

The price and inventory of 2STA1695 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2STA1695 is usually 5 days.

3.What payment methods are accepted for 2STA1695?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2STA1695 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2STA1695?

2STA1695 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2STA1695 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 2STA1695?

For technical support, including 2STA1695 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2STA1695 requirements.

6.How does Aetrix verify that 2STA1695 is sourced from the original manufacturer or authorized distributors?

All 2STA1695 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 2STA1695 meets industry standards.

7.What is the process for return or replacement of 2STA1695?

All 2STA1695 units undergo pre-shipment inspection (PSI). If there is an issue with 2STA1695, 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 2STA1695 part is unused and in its original packaging.

Return procedure for 2STA1695:

1.Submit a request within 90 days.

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

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