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

onsemi BSP52T3G

Name: BSP52T3G
Brand: onsemi
SKU: BSP52T3G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BSP52T3G

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: BSP52T3G.pdf

Description:: TRANS NPN DARL 80V 1A SOT223

Quantity:: RFQ Add To RFQ list

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Inventory:3,998

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Product details

Overview

BSP52T3G from onsemi is an NPN small-signal Darlington transistor in SOT-223 package, rated for 80 V V_CES, 1.0 A I_C, and 1.25 W P_D (on 1 cm² pad), optimized for medium-power switching in relay, solenoid, lamp, and print hammer drivers.

For engineers reviewing the BSP52T3G datasheet, pinout, applications, or equivalent options, key selection criteria include DC current gain (h_FE = 1000–2000 at I_C = 150 mA), V_CE(sat) ≤ 1.3 V, thermal resistance (R_JA = 100 °C/W), and Pb-free RoHS-compliant SOT-223 packaging.

Technical Context

This Darlington pair integrates two NPN transistors to deliver high current gain with single-base control, enabling low-drive-current switching of inductive loads. Its structure supports fast turn-on/turn-off (t_r = 155 ns, t_f = 365 ns) under 10 V V_CC and 150 mA I_C.

The device operates across −65 °C to +150 °C junction temperature and features dual power dissipation ratings: 0.8 W (minimum footprint) and 1.25 W (1 cm² copper pad), reflecting its thermal design flexibility for surface-mount PCB layouts.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CES	80 V - Maximum collector-emitter voltage before breakdown; suitable for 24–48 V industrial control rails
I_C	1.0 A - Continuous collector current rating; supports solenoid and relay coils up to ~12 W at 12 V
h_FE	1000–2000 - High DC current gain at I_C = 150 mA; reduces required base drive current to ≤0.15 mA
V_CE(sat)	≤1.3 V - Low saturation voltage at I_C = 500 mA / I_B = 0.5 mA; limits conduction loss to <0.65 W
R_JA	100 °C/W - Junction-to-ambient thermal resistance on 1 cm² pad; enables 1.25 W continuous operation at T_A = 25 °C
t_r/t_f	155 ns / 365 ns - Rise/fall times at V_CC = 10 V, I_C = 150 mA; supports switching frequencies up to ~1 MHz

Pinout & Package

The BSP52T3G is housed in a 4-pin SOT-223 package (Case 318E, Style 1), with pins 1 (Base), 2 and 4 (Collector, internally connected), and 3 (Emitter). The formed leads accommodate thermal stress during reflow or wave soldering.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control input for Darlington pair; accepts low-current logic-level drive (e.g., MCU GPIO)
2 & 4	Collector	Internally tied high-current output node; connects to load supply rail (e.g., 24 V)
3	Emitter	Power return path; connects to ground or load return; requires low-impedance PCB trace

Key Features

Feature	Design Value
High h_FE Darlington architecture	Enables direct drive from 3.3 V/5 V microcontrollers without external base resistors or pre-driver stages
SOT-223 thermal performance	1.25 W power dissipation on 1 cm² copper pad supports sustained 500 mA switching without heatsink
RoHS-compliant Pb-free construction	Meets global environmental regulations; compatible with lead-free reflow profiles (260 °C, 10 s max)
Fast switching timing	Sub-microsecond rise/fall times reduce switching losses in PWM-driven inductive loads

Applications

Relay Driver	Lamp Driver
Use Scenario: Driving 12 V/24 V electromagnetic relays in PLC I/O modules and industrial controllers. IC Role / Device Role / Timing Role: NPN Darlington switch providing galvanic isolation between low-voltage logic and high-current coil circuit. Use Value: 1000× current gain allows 1 mA base drive to switch 1 A relay coil; V_CE(sat) ≤ 1.3 V minimizes coil voltage drop and ensures reliable pull-in.	Use Scenario: Controlling incandescent and LED indicator lamps in automotive dashboards and HMI panels. IC Role / Device Role / Timing Role: Medium-power load switch interfacing MCU GPIOs to 1–5 W lamp loads. Use Value: SOT-223 package handles 1.25 W dissipation at ambient; fast switching prevents visible flicker in PWM-dimmed lamps.
Solenoid Driver	Print Hammer Driver
Use Scenario: Actuating 24 V DC solenoids in vending machines, fluid valves, and access control locks. IC Role / Device Role / Timing Role: High-gain switching element absorbing inductive kickback via external flyback diode. Use Value: 80 V V_CES withstands typical solenoid flyback spikes; 1.0 A I_C rating covers standard 12–24 V/0.5–1.0 A solenoids.	Use Scenario: Driving electromechanical print hammers in legacy dot-matrix printers and POS terminals. IC Role / Device Role / Timing Role: Fast-switching Darlington delivering short-duration high-current pulses to hammer coils. Use Value: 155 ns rise time ensures precise hammer strike timing; 1.25 W P_D sustains repetitive 10 ms pulses at 100 Hz.

Relay Driver

Lamp Driver

Use Scenario: Driving 12 V/24 V electromagnetic relays in PLC I/O modules and industrial controllers.

IC Role / Device Role / Timing Role: NPN Darlington switch providing galvanic isolation between low-voltage logic and high-current coil circuit.

Use Value: 1000× current gain allows 1 mA base drive to switch 1 A relay coil; V_CE(sat) ≤ 1.3 V minimizes coil voltage drop and ensures reliable pull-in.

Use Scenario: Controlling incandescent and LED indicator lamps in automotive dashboards and HMI panels.

IC Role / Device Role / Timing Role: Medium-power load switch interfacing MCU GPIOs to 1–5 W lamp loads.

Use Value: SOT-223 package handles 1.25 W dissipation at ambient; fast switching prevents visible flicker in PWM-dimmed lamps.

Solenoid Driver

Print Hammer Driver

Use Scenario: Actuating 24 V DC solenoids in vending machines, fluid valves, and access control locks.

IC Role / Device Role / Timing Role: High-gain switching element absorbing inductive kickback via external flyback diode.

Use Value: 80 V V_CES withstands typical solenoid flyback spikes; 1.0 A I_C rating covers standard 12–24 V/0.5–1.0 A solenoids.

Use Scenario: Driving electromechanical print hammers in legacy dot-matrix printers and POS terminals.

IC Role / Device Role / Timing Role: Fast-switching Darlington delivering short-duration high-current pulses to hammer coils.

Use Value: 155 ns rise time ensures precise hammer strike timing; 1.25 W P_D sustains repetitive 10 ms pulses at 100 Hz.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN Darlington transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBT5210LT1G	Lower h_FE (500–1000), lower P_D (0.35 W), SOT-23 package	Not suitable for >300 mA loads; limited thermal capacity for sustained switching	Select when board space is critical and load current ≤200 mA
ZTX851	Higher V_CEO (100 V), TO-92 package, higher R_JA (~200 °C/W)	Requires heatsinking above 300 mA; not surface-mount compatible with high-density layouts	Select for through-hole prototyping or legacy designs requiring 100 V rating

Compared with MMBT5210LT1G and ZTX851, the BSP52T3G delivers superior thermal performance (1.25 W, R_JA = 100 °C/W), higher current gain (1000–2000), and SOT-223 mountability-making it optimal for production-grade 500–1000 mA switching where reliability and board-level thermal management matter.

Availability

BSP52T3G is available at Aetrix Electronics and suitable for relay driver, solenoid actuation, and lamp control applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for BSP52T3G 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.

The BSP52T3G belongs to onsemi's medium-power discrete transistor portfolio, engineered specifically for robust, high-gain switching in industrial automation, appliance control, and electromechanical interface applications.

FAQ

What is the maximum continuous collector current for BSP52T3G?

The BSP52T3G is rated for a maximum continuous collector current (I_C) of 1.0 A at T_C = 25 °C. This rating assumes proper PCB thermal management-specifically, mounting on a 1 cm² copper pad to achieve the 1.25 W power dissipation limit. At higher ambient temperatures or reduced copper area, derating applies per the datasheet's 10 mW/°C slope above 25 °C.

Does BSP52T3G have a built-in base-emitter resistor?

No, the BSP52T3G does not include an integrated base-emitter resistor. It is a bare Darlington transistor requiring external base current limiting-typically via a series resistor from the driving source (e.g., MCU GPIO) to Pin 1 (Base). This allows full design flexibility in setting I_B for desired saturation and switching speed.

What is the pin configuration of BSP52T3G in the SOT-223 package?

The BSP52T3G uses a 4-pin SOT-223 package (Case 318E) with Pin 1 = Base, Pins 2 & 4 = Collector (internally connected), and Pin 3 = Emitter. The physical layout places the emitter tab on the left when viewing the top marking side with leads down; this configuration is standardized across onsemi's SOT-223 Darlington family.

Is BSP52T3G suitable for automotive applications?

The BSP52T3G itself is not AEC-Q101 qualified; however, its automotive-grade variant SBSP52T1G is AEC-Q101 qualified and PPAP capable. For non-safety-critical automotive subsystems (e.g., interior lighting, HVAC actuators), BSP52T3G may be used subject to internal qualification-but design-in for ASIL-B or higher systems requires the SBSP52T1G or other certified alternatives.

How does BSP52T3G compare to its PNP complement BSP62T1?

The BSP52T3G (NPN Darlington) and BSP62T1 (PNP Darlington) share identical SOT-223 packaging, voltage/current ratings (V_CEO = 80 V, I_C = 1.0 A), and thermal characteristics-but differ in polarity and pinout. BSP62T1 has Pin 1 = Emitter, Pins 2 & 4 = Collector, Pin 3 = Base. They are designed as complementary pairs for H-bridge or push-pull output stages where bidirectional load control is needed.

BSP52T3G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: NPN - Darlington

Current - Collector (Ic) (Max):: 1 A

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

Vce Saturation (Max) @ Ib, Ic:: 1.3V @ 500µA, 500mA

Current - Collector Cutoff (Max):: 10µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 2000 @ 500mA, 10V

Power - Max:: 800 mW

Frequency - Transition:: -

Operating Temperature:: -65°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-223 (TO-261)

BSP52T3G FAQ

1.How can I place an order for BSP52T3G through Aetrix?

Please submit a Request for Quotation (RFQ) for BSP52T3G 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 BSP52T3G reliable?

The price and inventory of BSP52T3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BSP52T3G is usually 5 days.

3.What payment methods are accepted for BSP52T3G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BSP52T3G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BSP52T3G?

BSP52T3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BSP52T3G 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 BSP52T3G?

For technical support, including BSP52T3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BSP52T3G requirements.

6.How does Aetrix verify that BSP52T3G is sourced from the original manufacturer or authorized distributors?

All BSP52T3G 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 BSP52T3G meets industry standards.

7.What is the process for return or replacement of BSP52T3G?

All BSP52T3G units undergo pre-shipment inspection (PSI). If there is an issue with BSP52T3G, 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 BSP52T3G part is unused and in its original packaging.

Return procedure for BSP52T3G:

1.Submit a request within 90 days.

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

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