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

STMicroelectronics STN715

Name: STN715
Brand: STMicroelectronics
SKU: STN715
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STN715

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-261-4, TO-261AA

Datasheet:: STN715.pdf

Description:: TRANS NPN 80V 1.5A SOT-223

Quantity:: RFQ Add To RFQ list

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Inventory:3,535

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Product details

Overview

STN715 from STMicroelectronics is an NPN medium-power bipolar junction transistor in SOT-223 package, rated for V_CEO = 80 V, I_C = 1.5 A, P_tot = 1.6 W at T_c = 25 °C, with h_FE ≥ 140 at I_C = 100 mA, used in voltage regulation and relay driver circuits.

For engineers reviewing the STN715 datasheet, STN715 pinout, STN715 application, or STN715 equivalent, key selection factors include saturation voltage (V_CE(sat) ≤ 0.5 V at I_C = 1 A), thermal resistance (R_thj-amb = 78 °C/W on 1 cm² PCB), and rugged planar construction for industrial switching reliability.

Technical Context

The STN715 operates as a single NPN switch with base-controlled current amplification, optimized for medium-power linear and switching applications where thermal management on standard PCB copper is critical. Its planar silicon process ensures consistent h_FE spread and high V_CEO(sus) = 80 V under pulsed conditions.

Designed for DC and low-frequency (<50 MHz f_T) operation, it supports continuous collector currents up to 1.5 A and peak pulses of 2 A (t_p < 5 ms), with guaranteed V_BE(sat) ≤ 1.1 V at I_C = 1 A / I_B = 100 mA - enabling efficient drive from microcontroller GPIOs.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	80 V - maximum safe collector-emitter voltage with base open; defines upper limit for relay coil or regulator output stage blocking.
I_C	1.5 A continuous - usable DC load current without forced cooling on minimal PCB copper area.
P_tot	1.6 W at T_c = 25 °C - total power dissipation limit when case temperature is maintained at 25 °C via heatsinking or layout.
h_FE	≥140 at I_C = 100 mA - ensures low base drive requirement (e.g., ~0.7 mA base current for 100 mA collector load).
V_CE(sat)	≤0.5 V at I_C = 1 A / I_B = 100 mA - minimizes conduction loss and self-heating in saturated switch mode.
R_thj-amb	78 °C/W - junction-to-ambient thermal resistance on 1 cm² PCB copper; determines temperature rise under given power dissipation.

Pinout & Package

SOT-223 package with 3 leads: emitter (tab-connected), base (center), collector (large tab). Tab is electrically connected to emitter for direct PCB thermal coupling and grounding.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Emitter terminal	Internally bonded to metal tab; must be connected to low-impedance ground plane for thermal and electrical performance.
2 (Base)	Control input	Receives current-limited drive signal; requires series resistor to limit I_B ≤ 0.3 A (max) and ensure h_FE-based gain control.
3 (Collector)	Load connection	Connected to switched load (e.g., relay coil or regulator pass element); carries full I_C current and dissipates V_CE × I_C power.

Key Features

Feature	Design Value
Planar silicon process	Rugged construction with controlled parameter spread and high secondary breakdown immunity for industrial reliability.
V_CEO(sus) = 80 V	Guaranteed sustaining voltage under pulsed conditions, supporting robust operation in inductive load switching.
f_T = 50 MHz	Sufficient for audio-frequency and PWM switching up to ~100 kHz with stable gain margin.
Low V_CE(sat)	Reduces conduction losses below 0.5 V at full rated current, improving efficiency in linear regulators and drivers.

Applications

Voltage Regulation

Relay Driver

Use Scenario: Linear voltage regulator pass element in 5–24 V systems with variable load up to 1.2 A.

IC Role / Device Role / Timing Role: NPN series pass transistor controlling output voltage via base bias from error amplifier.

Use Value: Low V_CE(sat) minimizes dropout voltage and heat generation at full load, extending thermal headroom.

Use Scenario: Driving 12 V/500 mA electromagnetic relay in PLC I/O modules.

IC Role / Device Role / Timing Role: Switching element turning relay coil on/off using microcontroller GPIO through base resistor.

Use Value: High h_FE allows direct drive from 3.3 V MCU pins with ≤1 kΩ base resistor, eliminating need for pre-driver stage.

DC Motor Control

Power Supply Sequencing

Use Scenario: Low-side switch for brushed DC motor (12 V, 800 mA) in industrial actuators.

IC Role / Device Role / Timing Role: Medium-power NPN switch enabling PWM-based speed control at ≤20 kHz.

Use Value: 50 MHz f_T ensures stable gain during PWM transitions, reducing switching distortion and EMI.

Use Scenario: Enabling delayed turn-on of auxiliary rails in multi-rail power supplies.

IC Role / Device Role / Timing Role: Discrete delay switch triggered by RC network to sequence 3.3 V after 5 V rail stabilization.

Use Value: Tight V_BE(sat) tolerance (1.0–1.1 V) ensures predictable timing threshold across temperature and unit variance.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN medium-power switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD127	V_CEO = 80 V, I_C = 2 A, P_tot = 1.5 W, SOT-223, h_FE = 30–120	Lower h_FE range requires higher base drive; higher I_C rating but lower power derating above 25 °C	Prefer when higher peak current capability is needed and base drive circuit can support wider h_FE variation.
ZTX653	V_CEO = 100 V, I_C = 1 A, P_tot = 1 W, SOT-89, h_FE = 100–300	Higher voltage rating but lower current/power; smaller SOT-89 package limits thermal performance	Choose for space-constrained designs requiring >80 V blocking but <1 A load current and minimal board area.

Compared with MJD127 and ZTX653, the STN715 offers superior thermal resistance (78 °C/W vs. ≥90 °C/W), tighter h_FE minimum (140 vs. 30), and balanced 1.5 A/1.6 W ratings - making it optimal for thermally demanding, medium-current industrial switches where drive simplicity and thermal margin are prioritized.

Availability

STN715 is available at Aetrix Electronics and suitable for voltage regulation, relay driver, and generic switch applications requiring stable component supply, long-term industrial availability, and traceable sourcing.

Supply support for STN715 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 STN715 belongs to ST's medium-power bipolar transistor family, engineered for ruggedness and thermal stability in industrial control, power management, and electromechanical interface applications.

FAQ

Is the STN715 pin-compatible with the STF715?

No. The STN715 uses SOT-223 packaging with emitter-tab configuration, while the STF715 is in SOT-89 with different pin assignment (SOT-89 pin 1 = emitter, pin 2 = base, pin 3 = collector; SOT-223 pin 1 = emitter, pin 2 = base, pin 3 = collector, but tab is emitter). Layout and thermal design differ significantly - direct replacement requires PCB revision.

What is the maximum allowable base current for continuous operation?

The absolute maximum continuous base current is 0.3 A per datasheet Absolute Maximum Ratings. For reliable long-term operation, design base current to stay ≤0.2 A with appropriate derating above 25 °C ambient, and ensure pulse conditions (I_BM = 0.6 A) remain within 5 ms duration and 1.5% duty cycle.

Can the STN715 be used in Class AB audio amplifier output stages?

No. While its f_T = 50 MHz supports audio bandwidth, the STN715 lacks specified linearity parameters (e.g., harmonic distortion, SOA curves) and is not characterized for linear amplifier use. It is specified and qualified only for switching and medium-power regulation - use dedicated audio transistors like BD139 for such applications.

Does the metal tab require electrical isolation from the PCB ground plane?

No. The metal tab is internally connected to the emitter terminal and is intended to be soldered directly to a large copper pour acting as both thermal sink and circuit ground. Electrical isolation would compromise thermal performance and violate recommended mounting per ST's mechanical data and thermal guidelines.

STN715 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-261-4, TO-261AA

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 1.5 A

Voltage - Collector Emitter Breakdown (Max):: 80 V

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 100mA, 1A

Current - Collector Cutoff (Max):: 1mA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 40 @ 1A, 2V

Power - Max:: 1.6 W

Frequency - Transition:: 50MHz

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-223

STN715 FAQ

1.How can I place an order for STN715 through Aetrix?

Please submit a Request for Quotation (RFQ) for STN715 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 STN715 reliable?

The price and inventory of STN715 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STN715 is usually 5 days.

3.What payment methods are accepted for STN715?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STN715 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STN715?

STN715 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STN715 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 STN715?

For technical support, including STN715 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STN715 requirements.

6.How does Aetrix verify that STN715 is sourced from the original manufacturer or authorized distributors?

All STN715 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 STN715 meets industry standards.

7.What is the process for return or replacement of STN715?

All STN715 units undergo pre-shipment inspection (PSI). If there is an issue with STN715, 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 STN715 part is unused and in its original packaging.

Return procedure for STN715:

1.Submit a request within 90 days.

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

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