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

STMicroelectronics 2STA1694

Name: 2STA1694
Brand: STMicroelectronics
SKU: 2STA1694
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2STA1694

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

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

Datasheet:: 2STA1694.pdf

Description:: TRANS PNP 120V 8A TO-3P

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2STA1694 from STMicroelectronics is a high-power PNP epitaxial planar bipolar transistor designed for linear audio power amplification, featuring V_CEO = −120 V, I_C = −8 A, P_TOT = 80 W at T_c = 25 °C, f_T = 20 MHz, and complementary pairing with 2STC4467. It employs BiT-LA technology to ensure gain linearity in Class-AB output stages.

For engineers reviewing the 2STA1694 datasheet, 2STA1694 pinout, 2STA1694 application, or 2STA1694 equivalent, key selection criteria include safe operating area (SOA) at 125 °C, junction-to-case thermal resistance (1.563 °C/W), DC current gain (h_FE = 70–140 at I_C = −3 A), and fast-switching capability in high-fidelity audio output stages.

Technical Context

This PNP transistor operates in linear mode with fully characterized parameters up to T_J = 150 °C and T_c = 125 °C, supporting stable biasing in push-pull amplifier configurations. Its BiT-LA process delivers improved h_FE linearity versus collector current and low V_CE(sat) (−1.5 V at I_C = −3 A, I_B = −300 mA).

The device exhibits symmetrical breakdown ratings: V_CBO = V_CEO = −120 V and V_EBO = −6 V, enabling robust operation in split-rail audio supplies. Its SOA curve is explicitly defined for pulsed and continuous conditions, with derating starting at T_c > 25 °C per the published derating curve.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−120 V: Maximum collector-emitter voltage before avalanche under open-base condition; defines rail voltage headroom in ±60 V audio supplies.
I_C	−8 A continuous: Rated collector current at T_c = 25 °C; supports ≥50 W RMS output into 4 Ω with adequate heatsinking.
P_TOT	80 W at T_c = 25 °C: Total power dissipation limit; requires thermal interface and heatsink design targeting ≤1.563 °C/W R_thj-case.
f_T	20 MHz typical: Transition frequency at I_C = −0.5 A, V_CE = −12 V; ensures sufficient gain margin above audio band (20 kHz) for stable feedback loop design.
h_FE	70–140 at I_C = −3 A, V_CE = −4 V: DC current gain range used for bias network calculation and thermal runaway prevention in emitter-degenerated stages.
V_CE(sat)	−1.5 V max at I_C = −3 A, I_B = −300 mA: Saturation voltage defining conduction loss and thermal load in Class-AB output pairs.

Pinout & Package

Supplied in TO-3P package - a thermally optimized, insulated metal-can package with three leads: Collector (Case), Base, and Emitter. The case is electrically connected to the collector terminal and must be isolated from heatsink unless circuit topology permits common-collector mounting.

Pin/Terminal	Circuit Role	Design Meaning
1 (Tab/Case)	Collector	Electrically tied to metal tab; primary heat path and high-current output node; requires insulating washer if mounted to grounded heatsink.
2	Base	Current-controlled input terminal; driven by preceding stage (e.g., driver transistor or op-amp); sensitive to ESD and layout parasitics.
3	Emitter	High-current return path; connects to negative rail in standard PNP output configuration; carries full load current and influences thermal coupling to PCB ground plane.

Key Features

Feature	Design Value
BiT-LA process technology	Delivers h_FE linearity across I_C, reducing harmonic distortion in audio output stages without external linearization networks.
125 °C characterization	Full electrical specs validated at case temperature = 125 °C, enabling reliable thermal design for enclosed or high-ambient environments.
Complementary pairing	Matched performance with 2STC4467 (NPN), allowing symmetric push-pull output stage implementation with balanced slew rate and crossover behavior.
TO-3P mechanical robustness	High creepage/clearance dimensions (e.g., D = 19.9 mm, E = 15.6 mm) support reinforced insulation in industrial audio equipment meeting IEC 60065 or UL 62368-1.

Applications

Hi-Fi Audio Power Amplifier

Professional PA Output Stage

Use Scenario: Discrete Class-AB output stage in stereo amplifier delivering 50–100 W per channel into 4–8 Ω loads.

IC Role / Device Role / Timing Role: Main PNP output transistor in complementary pair; handles negative half-cycle current delivery and thermal cycling.

Use Value: Low V_CE(sat) and stable h_FE minimize quiescent drift and second-harmonic distortion, preserving THD+N < 0.05% at rated power.

Use Scenario: High-reliability output module in 200 W+ powered loudspeaker cabinets with forced-air cooling.

IC Role / Device Role / Timing Role: PNP switching element in parallel-configured output banks; operated in linear region with active current limiting.

Use Value: SOA-rated for 16 A peak current and 80 W continuous dissipation enables short-term dynamic headroom without secondary breakdown.

Studio Monitor Driver

Industrial Audio Signal Distribution

Use Scenario: Near-field studio monitor with bi-amplified topology using discrete output transistors per band.

IC Role / Device Role / Timing Role: Low-noise, high-linearity PNP device in midrange/tweeter output buffer; biased for minimal crossover notch.

Use Value: Gain linearity (BiT-LA) and 20 MHz f_T preserve transient response and phase coherence up to 100 kHz, critical for accurate spectral reproduction.

Use Scenario: Centralized audio distribution system feeding multiple zones in commercial buildings with long cable runs.

IC Role / Device Role / Timing Role: Output stage transistor in constant-voltage (70 V/100 V line) amplifier modules driving transformer-coupled speakers.

Use Value: −120 V V_CEO rating safely accommodates reflected transients and lightning-induced surges on distributed lines without clamping or failure.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJE15034	V_CEO = −150 V, I_C = −8 A, f_T = 4 MHz, TO-247 package	Higher breakdown but lower f_T; less suitable for wideband audio requiring >10 MHz gain-bandwidth product	Prefer where higher voltage margin is critical and bandwidth demand is ≤5 MHz.
BD139	V_CEO = −80 V, I_C = −1.5 A, P_TOT = 12.5 W, TO-126 package	Lower voltage, current, and power rating; not SOA-validated at 125 °C	Only acceptable for low-power, non-critical consumer audio where cost outweighs reliability and thermal margin.

Compared with MJE15034 and BD139, the 2STA1694 uniquely balances high-voltage capability (−120 V), wide bandwidth (20 MHz), and full 125 °C characterization-making it optimal for professional-grade linear amplifiers demanding both fidelity and thermal resilience.

Availability

2STA1694 is available at Aetrix Electronics and suitable for Hi-Fi audio power amplifiers, professional PA systems, studio monitor drivers, and industrial audio signal distribution requiring stable component supply and long-term BOM continuity.

Supply support for 2STA1694 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, Switzerland, specializing in analog, power, microcontrollers, and automotive ICs with manufacturing and R&D across Europe, Asia, and the Americas.

The 2STA1694 belongs to ST's high-power bipolar transistor family developed specifically for linear audio amplifier applications, emphasizing gain linearity, thermal stability, and rugged SOA performance in demanding analog signal chains.

FAQ

Is the 2STA1694 still in active production?

No-the official STMicroelectronics datasheet labels 2STA1694 as "Obsolete Product(s)" with last revision dated February 2009. Aetrix Electronics maintains legacy inventory and offers traceable, tested stock for repair, replacement, and long-lifecycle industrial audio programs.

What is the recommended heatsink thermal resistance for continuous 80 W operation?

To sustain 80 W at T_c = 25 °C, the total thermal resistance from junction to ambient must be ≤1.563 °C/W (R_thj-case) plus heatsink + interface resistance. With typical thermal interface resistance of 0.2–0.5 °C/W, a heatsink with R_th ≤ 0.8 °C/W is required under forced convection.

Can the 2STA1694 be used in switching power supplies?

It is not optimized for switching applications: its f_T = 20 MHz and lack of specified turn-on/turn-off times or storage time make it unsuitable for SMPS operation. It is engineered for linear-mode audio amplification, where gain linearity and SOA integrity are prioritized over switching speed.

How does the BiT-LA process improve audio performance compared to standard planar bipolar processes?

BiT-LA modifies the base doping profile and epitaxial layer structure to flatten h_FE vs. I_C curves and reduce Early voltage variation-directly lowering harmonic distortion (especially 2nd and 3rd order) in Class-AB output stages without requiring complex emitter degeneration or feedback compensation.

2STA1694 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):: 8 A

Voltage - Collector Emitter Breakdown (Max):: 120 V

Vce Saturation (Max) @ Ib, Ic:: 1.5V @ 300mA, 3A

Current - Collector Cutoff (Max):: 10µA (ICBO)

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

Power - Max:: 80 W

Frequency - Transition:: 20MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-3P

2STA1694 FAQ

1.How can I place an order for 2STA1694 through Aetrix?

Please submit a Request for Quotation (RFQ) for 2STA1694 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 2STA1694 reliable?

The price and inventory of 2STA1694 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2STA1694 is usually 5 days.

3.What payment methods are accepted for 2STA1694?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2STA1694 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2STA1694?

2STA1694 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2STA1694 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 2STA1694?

For technical support, including 2STA1694 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2STA1694 requirements.

6.How does Aetrix verify that 2STA1694 is sourced from the original manufacturer or authorized distributors?

All 2STA1694 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 2STA1694 meets industry standards.

7.What is the process for return or replacement of 2STA1694?

All 2STA1694 units undergo pre-shipment inspection (PSI). If there is an issue with 2STA1694, 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 2STA1694 part is unused and in its original packaging.

Return procedure for 2STA1694:

1.Submit a request within 90 days.

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

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