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

Nexperia USA Inc. BST60,115

Name: BST60,115
Brand: Nexperia USA Inc.
SKU: BST60,115
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BST60,115

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: TO-243AA

Datasheet:: BST60,115.pdf

Description:: TRANS PNP DARL 45V 1A SOT-89

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BST60 from NXP Semiconductors (formerly Philips Semiconductors) is a PNP Darlington transistor in SOT89 package, designed for industrial switching with −45 V V_CE, −500 mA I_C, and integrated base-emitter resistor and clamp diode. It delivers high DC current gain (h_FE ≥ 2000 at −500 mA), low saturation voltage (V_CE(sat) ≤ −1.3 V), and is used in solenoid, relay, and print hammer drivers.

For engineers reviewing the BST60 datasheet, BST60 pinout, BST60 application, or BST60 equivalent, key selection criteria include its PNP Darlington architecture, −1.3 V saturation voltage at −500 mA/−0.5 mA drive, thermal resistance of 96 K/W (junction-to-ambient), and SOT89 collector-pad thermal design-critical for sustained industrial load switching.

Technical Context

The BST60 operates as a high-gain, medium-voltage PNP Darlington pair with built-in base resistor and emitter-base clamp diode, eliminating external bias components. Its structure enables direct TTL/CMOS-compatible drive with minimal base current (≤ −0.5 mA) while sustaining −500 mA collector current.

Thermal performance is defined for PCB mounting with 6 cm² collector pad (R_th(j-a) = 96 K/W); R_th(j-s) = 16 K/W confirms efficient heat transfer to solder joint. Switching times (t_on ≤ 500 ns, t_off ≤ 700 ns) support moderate-speed industrial control cycles.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CE	−45 V max - supports 36 V nominal industrial rails with margin
I_C	−500 mA continuous - drives solenoids and relays without heatsink at ambient ≤50 °C
h_FE	≥2000 at −500 mA - enables low-base-current digital logic interface
V_CE(sat)	≤ −1.3 V at −500 mA/−0.5 mA - minimizes power loss and self-heating during on-state
R_th(j-a)	96 K/W - requires ≥6 cm² copper pad for full 1.3 W dissipation
f_T	200 MHz - ensures stable operation beyond typical 10–50 kHz switching frequencies

Pinout & Package

SOT89 (SC-62) plastic surface-mount package with exposed collector pad for thermal conduction; 3 leads, single-sided PCB mount.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Current exit node; connects to load return or ground reference
2	Collector	Main power output node; thermally bonded to PCB copper pad
3	Base	Control input; internally biased via integrated resistor for TTL-level drive

Key Features

Feature	Design Value
Integrated base resistor	Enables direct connection to 3.3 V/5 V logic without external bias network
Clamp diode	Suppresses inductive kickback from solenoids/relays, protecting driver stage
High h_FE at full load	Maintains ≥2000 gain at −500 mA, reducing base drive power by >90% vs. standard PNP
SOT89 thermal pad	Supports 1.3 W dissipation with standard PCB layout-no heatsink required

Applications

Print Hammer Driver

Solenoid Control

Use Scenario: Driving electromagnetic print hammers in dot-matrix printers requiring fast, repetitive actuation.

IC Role / Device Role / Timing Role: High-current PNP switch delivering −500 mA pulses with <500 ns turn-on to meet 1–2 kHz hammer cycle timing.

Use Value: Integrated clamp diode absorbs back-EMF, preventing driver failure during rapid de-energization.

Use Scenario: Controlling 24 V DC solenoids in pneumatic valves and fluid control systems.

IC Role / Device Role / Timing Role: Medium-voltage PNP Darlington providing −45 V blocking and −500 mA hold current with logic-level enable.

Use Value: Built-in base resistor allows direct microcontroller GPIO drive, reducing BOM count by one resistor.

Relay Interface

Lamp Load Switching

Use Scenario: Isolating and driving 12–24 V electromechanical relays in PLC I/O modules.

IC Role / Device Role / Timing Role: Level-shifting switch translating 3.3 V/5 V logic signals into −45 V/−500 mA relay coil drive.

Use Value: Low V_CE(sat) (≤ −1.3 V) limits power loss to <0.65 W, enabling compact board layout.

Use Scenario: Switching incandescent or LED indicator lamps in industrial HMI panels.

IC Role / Device Role / Timing Role: Robust PNP load switch handling inrush currents up to −2 A peak without latch-up.

Use Value: 150 °C max junction temperature and −65 °C to +150 °C storage range ensure reliability in wide-temperature enclosures.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBT6427	Lower V_CE (−30 V), lower I_C (−300 mA), no integrated diode	Not suitable for 45 V inductive loads; requires external flyback diode	Select when operating below 24 V and board space permits discrete protection
ZTX951	Higher V_CE (−80 V), higher V_CE(sat) (−2.0 V), no integrated resistor or diode	Needs external base resistor and clamp diode; less compact solution	Choose for higher voltage margin where thermal budget allows extra 0.7 V drop

Compared with MMBT6427 and ZTX951, BST60 uniquely combines −45 V rating, −500 mA capability, and integrated protection-reducing component count and layout complexity in 24–36 V industrial switching nodes.

Availability

BST60 is available at Aetrix Electronics and suitable for industrial automation, printer subsystems, and programmable logic controller (PLC) output stages requiring stable component supply across extended production lifecycles.

Supply support for BST60 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

NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with roots in Philips' pioneering analog and discrete device development.

The BST series belongs to NXP's industrial-grade discrete transistor portfolio, engineered specifically for ruggedized, high-reliability switching in factory-floor equipment where thermal robustness and integration reduce system-level failure points.

FAQ

What is the maximum continuous collector current for BST60?

The BST60 supports −500 mA continuous collector current (I_C) at T_amb ≤ 25 °C with proper PCB thermal design (6 cm² collector pad). At elevated ambient temperatures or reduced copper area, derating applies per the R_th(j-a) = 96 K/W thermal model.

Does BST60 require an external flyback diode when driving inductive loads?

No. The BST60 integrates an internal emitter-base clamp diode that provides flyback path for inductive energy, eliminating need for external diode in most solenoid, relay, and print hammer applications-verified in Philips' original test circuit Fig.3.

Can BST60 be driven directly from a 3.3 V microcontroller GPIO?

Yes. Its integrated base resistor enables direct connection to 3.3 V or 5 V logic outputs. With −0.5 mA base current sufficient for −500 mA collector drive, typical microcontroller pins (±20 mA) provide ample margin without buffer stages.

What is the thermal resistance from junction to ambient for BST60 in standard layout?

R_th(j-a) is 96 K/W when mounted on a single-sided PCB with tin-plated 6 cm² copper pad under the collector lead. This value assumes no additional heatsinking and defines the upper limit of steady-state power dissipation (1.3 W) at 25 °C ambient.

BST60,115 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: TO-243AA

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: PNP - Darlington

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

Voltage - Collector Emitter Breakdown (Max):: 45 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

BST60,115 FAQ

1.How can I place an order for BST60,115 through Aetrix?

Please submit a Request for Quotation (RFQ) for BST60,115 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 BST60,115 reliable?

The price and inventory of BST60,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BST60,115 is usually 5 days.

3.What payment methods are accepted for BST60,115?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BST60,115 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BST60,115?

BST60,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BST60,115 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 BST60,115?

For technical support, including BST60,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BST60,115 requirements.

6.How does Aetrix verify that BST60,115 is sourced from the original manufacturer or authorized distributors?

All BST60,115 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 BST60,115 meets industry standards.

7.What is the process for return or replacement of BST60,115?

All BST60,115 units undergo pre-shipment inspection (PSI). If there is an issue with BST60,115, 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 BST60,115 part is unused and in its original packaging.

Return procedure for BST60,115:

1.Submit a request within 90 days.

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

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