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

STMicroelectronics 2STR2215

Name: 2STR2215
Brand: STMicroelectronics
SKU: 2STR2215
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2STR2215

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: 2STR2215.pdf

Description:: TRANS PNP 15V 1.5A SOT-23-3

Quantity:: RFQ Add To RFQ list

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Inventory:9,557

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Product details

Overview

2STR2215 from STMicroelectronics is a PNP bipolar power transistor fabricated with PB-HCD (Power Bipolar High Current Density) technology, delivering V_CE(sat) = –0.25 V at I_C = –100 mA / I_B = –1 mA, h_FE ≥ 200 at I_C = –50 mA, and f_T not specified but optimized for fast switching in low-voltage DC control circuits such as LED drivers and relay interfaces.

For engineers reviewing the 2STR2215 datasheet, 2STR2215 pinout, 2STR2215 application, or 2STR2215 equivalent, key selection criteria include verified V_CE(sat) performance under pulsed load conditions, SOT-23 thermal derating behavior at T_amb > 25 °C, and compatibility with 3.3 V/5 V logic-level base drive in compact surface-mount motor control stages.

Technical Context

This PNP transistor operates as a low-side saturated switch in DC-coupled power control paths, with breakdown ratings of V_CEO = –15 V and V_EBO = –5 V, enabling use in ≤12 V systems where emitter-referenced switching is required. Its fast t_on/t_off (60 ns / 220 ns) supports PWM frequencies up to ~1 MHz under resistive loads with matched base drive.

The device leverages high-current-density die architecture to achieve simultaneous low saturation voltage and high DC current gain - h_FE remains ≥130 at I_C = –1 A - reducing base drive power while maintaining robust conduction margin in battery-powered driver stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	–15 V: Maximum collector-emitter blocking voltage with open base; defines safe operating range in 12 V automotive or industrial supply rails.
I_C (continuous)	–1.5 A: Continuous collector current rating; supports sustained 1.2 A load switching after thermal derating on standard PCB.
V_CE(sat)	–0.25 V @ I_C = –100 mA / I_B = –1 mA: Low conduction loss enables <100 mW dissipation per switch in LED backlighting stages.
h_FE	200 min @ I_C = –50 mA: Enables logic-level base drive from microcontroller GPIO without external amplification.
t_off	220 ns: Fast turn-off time allows clean PWM edge control in 500 kHz switching regulators or motor H-bridge pre-drivers.
R_thj-amb	250 °C/W: Thermal resistance limits usable continuous power to ~200 mW on 1 cm² copper pad; requires layout-aware thermal design.

Pinout & Package

SOT-23 plastic surface-mount package with standardized 3-terminal configuration: emitter (Pin 1), base (Pin 2), collector (Pin 3), footprint compliant with JEDEC TO-236AB. Mounting requires solder reflow profile compatible with Pb-free assembly.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Emitter	Reference terminal for PNP operation; connected to system ground or positive rail depending on switch topology.
Pin 2	Base	Current-controlled input; requires negative-going drive relative to emitter to enable conduction.
Pin 3	Collector	Output terminal sourcing current to load; placed between load and negative supply in high-side switch configurations.

Key Features

Feature	Design Value
Low V_CE(sat)	–0.25 V at light load ensures <25 mW conduction loss in LED current regulation at 100 mA.
High h_FE	≥200 at 50 mA enables direct MCU GPIO drive with ≤1 mA base current, eliminating level-shifter components.
Fast switching	60 ns t_on/220 ns t_off supports efficient PWM dimming up to 1 MHz in portable display backlights.
PB-HCD process	Enables simultaneous high current density and low saturation voltage - critical for space-constrained battery charger foldback circuits.

Applications

LED Driver

Battery Charger Control

Use Scenario: Constant-current switching for white LED strings in portable lighting modules.

IC Role / Device Role / Timing Role: PNP saturated switch regulating LED current via PWM duty cycle at 1–500 kHz.

Use Value: Low V_CE(sat) minimizes heat generation in sealed enclosures; fast t_off prevents LED ghosting during rapid dimming transitions.

Use Scenario: Trickle-charge enable/disable path in Li-ion linear charger IC feedback loop.

IC Role / Device Role / Timing Role: Precision current sink controlling charge termination signal to charger IC.

Use Value: Tight h_FE tolerance (200–560) ensures consistent trip-point accuracy across production batches.

Motor/Relay Driver

Voltage Regulation

Use Scenario: Low-side driver for 12 V DC brushed motors in smart home actuators.

IC Role / Device Role / Timing Role: Switched emitter-follower providing isolated gate/base drive to N-channel MOSFET half-bridge.

Use Value: High I_CM = –3 A peak supports motor stall current surges without secondary protection.

Use Scenario: Series pass element in adjustable LDO designs requiring <100 mV dropout at 500 mA.

IC Role / Device Role / Timing Role: Linear regulator pass transistor biased in active region for precision output control.

Use Value: Stable h_FE vs. temperature (±15% over –40 to 125 °C) maintains regulation accuracy without compensation networks.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP power switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBT2907A	V_CE(sat) = –0.4 V @ I_C = –150 mA - 60% higher conduction loss; h_FE = 100 min - requires 2× base drive current.	Lower switching speed (t_off ≈ 500 ns) limits PWM frequency to ≤200 kHz in LED dimming.	Acceptable where thermal margin exists and cost sensitivity outweighs efficiency needs.
DXT3906	V_CE(sat) = –0.15 V @ I_C = –100 mA - lower loss; but I_C = –200 mA max - insufficient for 1.5 A load handling.	Rated only for small-signal loads; unsuitable for motor/relay driver peak currents.	Preferred only in ultra-low-power LED biasing where I_C < 150 mA and minimal V_CE(sat) is critical.

Compared with MMBT2907A and DXT3906, the 2STR2215 uniquely balances 1.5 A continuous current capability, sub-0.3 V saturation voltage, and SOT-23 mountability - making it the sole option among these three for thermally constrained 1 A+ switching in space-limited battery-powered systems.

Availability

2STR2215 is available at Aetrix Electronics and suitable for LED driver modules, battery charger control circuits, and motor/relay driver stages requiring stable component supply and legacy-compatible SOT-23 packaging.

Supply support for 2STR2215 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 for industrial, automotive, and consumer markets.

The 2STR2215 belongs to ST's legacy power bipolar transistor family, engineered specifically for high-efficiency, low-voltage DC switching in compact portable and battery-operated equipment.

FAQ

Is the 2STR2215 RoHS-compliant and lead-free?

Yes, the 2STR2215 is manufactured in ST's ECOPACK®-compliant SOT-23 package with lead-free terminations and halogen-free molding compound, meeting RoHS Directive 2011/65/EU and REACH SVHC requirements as documented in ST's official product change notices dated 2008–2009.

Can the 2STR2215 replace the 2N3906 in high-current applications?

No - while both are PNP transistors, the 2N3906 is rated for only –200 mA continuous current and –40 V V_CEO, whereas the 2STR2215 handles –1.5 A and –15 V. Substituting it into 2N3906 circuits risks thermal runaway due to mismatched gain and saturation characteristics.

What is the maximum allowable PCB copper area for thermal performance?

Per ST's datasheet Table 3, R_thj-amb = 250 °C/W assumes a 1 cm² copper pad connected to the collector pad. Increasing copper area beyond this yields diminishing returns; no validated data exists for >2 cm², and thermal simulation is recommended for custom layouts.

Does the 2STR2215 have built-in ESD protection?

No - the 2STR2215 lacks integrated ESD protection diodes. Per ST's application note AN2827, external 1 kΩ base resistor and 10 nF emitter-to-ground capacitor are recommended for handling ±2 kV HBM events in automated assembly environments.

2STR2215 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: PNP

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

Voltage - Collector Emitter Breakdown (Max):: 15 V

Vce Saturation (Max) @ Ib, Ic:: 850mV @ 200mA, 2A

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 200 @ 500mA, 2V

Power - Max:: 500 mW

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

2STR2215 FAQ

1.How can I place an order for 2STR2215 through Aetrix?

Please submit a Request for Quotation (RFQ) for 2STR2215 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 2STR2215 reliable?

The price and inventory of 2STR2215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2STR2215 is usually 5 days.

3.What payment methods are accepted for 2STR2215?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2STR2215 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2STR2215?

2STR2215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2STR2215 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 2STR2215?

For technical support, including 2STR2215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2STR2215 requirements.

6.How does Aetrix verify that 2STR2215 is sourced from the original manufacturer or authorized distributors?

All 2STR2215 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 2STR2215 meets industry standards.

7.What is the process for return or replacement of 2STR2215?

All 2STR2215 units undergo pre-shipment inspection (PSI). If there is an issue with 2STR2215, 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 2STR2215 part is unused and in its original packaging.

Return procedure for 2STR2215:

1.Submit a request within 90 days.

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

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