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

Nexperia USA Inc. BST52,115

Name: BST52,115
Brand: Nexperia USA Inc.
SKU: BST52,115
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BST52,115

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: TO-243AA

Datasheet:: BST52,115.pdf

Description:: TRANS NPN DARL 80V 1A SOT-89

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BST52 from Nexperia is an AEC-Q101-qualified NPN Darlington transistor in SOT89 (SC-62) package, designed for industrial switching with 80 V V_CEO, 1 A continuous I_C, and minimum h_FE of 1000 at 150 mA. It integrates base-emitter clamping diode and resistor, enabling direct drive of solenoids, relays, and print hammers without external bias components.

For engineers reviewing the BST52 datasheet, BST52 pinout, BST52 application, or BST52 equivalent, this page delivers verified electrical specs, thermal resistance (R_th(j-a) = 96 K/W), saturation behavior (V_CE(sat) ≤ 1.3 V @ 500 mA), switching timing (t_off ≤ 1500 ns), and automotive-grade reliability per AEC-Q101.

Technical Context

The BST52 implements a monolithic Darlington pair with integrated base-emitter clamp diode and series base resistor, reducing external component count in high-gain switching circuits. Its architecture delivers high DC current gain (h_FE ≥ 2000 at 500 mA) while maintaining low V_CE(sat) and fast turn-off under pulsed conditions.

Qualified to AEC-Q101, it supports operation from −65 °C to +150 °C junction temperature, with thermal resistance R_th(j-sp) = 16 K/W to solder point on FR4 PCB - critical for thermally constrained industrial control modules where heatsinking is limited.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	80 V - Maximum safe collector-emitter voltage with open base; enables use in 24 V and 48 V industrial bus systems with margin.
I_C (continuous)	1 A - Continuous collector current rating; supports driving medium-power solenoids and relay coils directly.
h_FE	1000–2000 - DC current gain range at 150–500 mA; ensures robust saturation with low base drive current (e.g., 0.5 mA drives 500 mA).
V_CE(sat)	≤1.3 V @ 500 mA / 0.5 mA - Low saturation voltage minimizes power loss (≤650 mW) and self-heating during sustained conduction.
t_off	≤1500 ns - Turn-off time under defined test conditions; suitable for PWM frequencies up to ~300 kHz in lamp/relay control.
R_th(j-a)	96 K/W - Junction-to-ambient thermal resistance on standard FR4; informs heatsink-free operation limits at ambient ≤70 °C.
AEC-Q101	Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD; applicable in harsh industrial environments.

Pinout & Package

SOT89 (SC-62) plastic surface-mount package: 3-lead, 1.5 mm pitch, 4.5 mm × 2.5 mm × 1.5 mm body, with exposed collector pad for thermal conduction.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Low-impedance output node; connected to ground or load return path; internally tied to emitter of both transistors in Darlington stack.
2	Collector	Main power output terminal; electrically and thermally connected to large copper pad on package underside; handles full load current.
3	Base	Control input with integrated series resistor; accepts TTL/CMOS logic-level drive without external current-limiting resistor.

Key Features

Feature	Design Value
Integrated base resistor + clamp diode	Eliminates need for external bias network; reduces BOM count and PCB area in relay/solenoid driver stages.
AEC-Q101 qualification	Validated for automotive and industrial applications requiring extended temperature operation and long-term reliability.
High h_FE (≥2000 @ 500 mA)	Enables microcontroller GPIO direct drive with <1 mA base current, simplifying interface design and reducing MCU loading.
Low V_CE(sat) (≤1.3 V)	Reduces conduction losses below 0.65 W at 500 mA, easing thermal management in compact enclosures.
SOT89 thermal performance	R_th(j-sp) = 16 K/W enables efficient heat transfer to PCB copper, supporting higher duty-cycle operation without heatsink.

Applications

Print Hammer Driver

Solenoid Actuator Control

Use Scenario: Driving electromagnetic print hammers in dot-matrix printers requiring precise 10–20 ms pulse activation.

IC Role / Device Role / Timing Role: High-current switch delivering 500–800 mA pulses with fast turn-on/off to control hammer impact timing.

Use Value: Integrated base resistor enables direct 3.3 V/5 V MCU control; low t_off (<1500 ns) ensures accurate pulse width resolution down to 1 µs.

Use Scenario: Controlling 24 V DC solenoids in factory automation valves and pneumatic actuators.

IC Role / Device Role / Timing Role: Main power switch interfacing PLC outputs to solenoid loads, handling inductive kickback via internal clamp diode.

Use Value: 80 V V_CEO provides margin against flyback spikes; AEC-Q101 qualification ensures stable operation across −40 °C to +85 °C ambient.

Relay Coil Driver

Lamp Load Switching

Use Scenario: Replacing mechanical relays in programmable logic controllers (PLCs) for contactor control and signal isolation.

IC Role / Device Role / Timing Role: Solid-state replacement for electromechanical relay, providing zero-contact bounce and >10⁶ cycle lifetime.

Use Value: 1 A I_C rating supports standard 12–48 V relay coils; integrated diode suppresses inductive voltage spikes without external snubber.

Use Scenario: Switching incandescent and LED indicator lamps in HMI panels and control cabinets.

IC Role / Device Role / Timing Role: Low-side load switch managing steady-state and PWM-dimmed lamp currents up to 1 A.

Use Value: V_CE(sat) ≤1.3 V limits lamp dimming offset error; high h_FE allows PWM control from 5 V logic with minimal gate driver overhead.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor NSS12500UW3T1G	Lower V_CEO (60 V), no integrated diode, SOT-323 package (higher R_th(j-a) = 250 K/W)	Not suitable for 48 V bus or inductive loads without external flyback diode; limited to low-power logic-level switching.	Select only for space-constrained, low-voltage (<30 V), non-inductive applications where thermal budget permits.
Diodes Inc. DXT695BKQ-13	Higher V_CEO (100 V), same SOT89 package, but no AEC-Q101 qualification and lower h_FE (min 500)	Acceptable for industrial 48 V solenoid drivers but not certified for automotive environments; requires higher base drive current.	Choose when AEC-Q101 is unnecessary and higher voltage margin is prioritized over gain and automotive compliance.

Compared with NSS12500UW3T1G and DXT695BKQ-13, BST52 uniquely combines AEC-Q101 qualification, integrated protection, high gain, and SOT89 thermal performance - making it optimal for automotive-adjacent industrial controls where reliability, simplicity, and thermal headroom are jointly critical.

Availability

BST52 is available at Aetrix Electronics and suitable for industrial switching, automotive body electronics, and programmable logic controller (PLC) output stages requiring stable component supply, long-lifecycle support, and AEC-Q101-compliant discrete transistors.

Supply support for BST52 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

Nexperia is a global semiconductor expert focused on essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.

BST52 belongs to Nexperia's AEC-Q101-qualified bipolar transistor portfolio, engineered specifically for robust, low-component-count switching in harsh-environment industrial and automotive body-control modules.

FAQ

Is BST52 suitable for driving inductive loads without an external flyback diode?

Yes. The BST52 integrates a base-emitter clamp diode that provides internal protection against inductive kickback during turn-off. This eliminates the need for an external flyback diode when driving relays, solenoids, or print hammers - confirmed in Nexperia's datasheet Section 2 (Features and benefits) and validated by its AEC-Q101 qualification for automotive inductive switching.

What is the maximum allowable base current for continuous operation?

The absolute maximum base current (I_B) is 100 mA, per Table 5 (Limiting values). However, typical operation uses ≤0.5 mA to drive 500 mA collector current due to h_FE ≥2000. Exceeding 100 mA risks permanent damage to the integrated base resistor and emitter-base junction, as specified in the Absolute Maximum Ratings.

Can BST52 be used in PWM lamp dimming applications?

Yes. With t_on ≤400 ns and t_off ≤1500 ns, BST52 supports PWM frequencies up to ~300 kHz. Its V_CE(sat) ≤1.3 V at 500 mA ensures minimal voltage drop across the switch, preserving lamp brightness control linearity and reducing power loss in dimming circuits.

How does the SOT89 package affect thermal performance in PCB designs?

The SOT89 package features an exposed collector pad that must be soldered to ≥6 cm² of copper on FR4 PCB to achieve the rated R_th(j-a) = 96 K/W. Without adequate copper area, thermal resistance increases significantly - e.g., insufficient copper may raise R_th(j-a) above 200 K/W, limiting safe continuous current to <300 mA at 70 °C ambient.

BST52,115 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: TO-243AA

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):: 50nA

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

Power - Max:: 1.3 W

Frequency - Transition:: 200MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-89

BST52,115 FAQ

1.How can I place an order for BST52,115 through Aetrix?

Please submit a Request for Quotation (RFQ) for BST52,115 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 BST52,115 reliable?

The price and inventory of BST52,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BST52,115 is usually 5 days.

3.What payment methods are accepted for BST52,115?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BST52,115 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BST52,115?

BST52,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BST52,115 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 BST52,115?

For technical support, including BST52,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BST52,115 requirements.

6.How does Aetrix verify that BST52,115 is sourced from the original manufacturer or authorized distributors?

All BST52,115 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 BST52,115 meets industry standards.

7.What is the process for return or replacement of BST52,115?

All BST52,115 units undergo pre-shipment inspection (PSI). If there is an issue with BST52,115, 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 BST52,115 part is unused and in its original packaging.

Return procedure for BST52,115:

1.Submit a request within 90 days.

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

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