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

Nexperia USA Inc. BSP31,115

Name: BSP31,115
Brand: Nexperia USA Inc.
SKU: BSP31,115
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BSP31,115

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: BSP31,115.pdf

Description:: TRANS PNP 60V 1A SOT-223

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BSP31,115 from Nexperia is a PNP medium-power bipolar junction transistor in SOT223 package, rated for −60 V V_CEO, −70 V V_CBO, and −1 A continuous collector current. It delivers DC current gain (h_FE) of 100–300 at −100 mA, −5 V V_CE, and exhibits V_CE(sat) ≤ −500 mV at −500 mA/−50 mA drive-used in telephony line interface stages and industrial power control circuits.

For engineers reviewing the BSP31,115 datasheet, BSP31,115 pinout, BSP31,115 application, or BSP31,115 equivalent, key selection criteria include verified PNP polarity, SOT223 thermal performance (R_{th j-a} = 93 K/W), low saturation voltage under high-current switching, and compatibility with BSP41/BSP43 NPN complements in push-pull configurations.

Technical Context

This device operates as a medium-power PNP switch or linear amplifier with fixed polarity and non-reverse-biased base-emitter junction handling. Its design supports DC and pulsed operation up to 2 A peak collector current, with f_T = 100 MHz enabling audio-frequency switching and moderate-speed digital interfacing.

Thermal management relies on the exposed collector pad in the SOT223 package, delivering R_{th j-s} = 12 K/W to PCB soldering point and requiring ≥1 cm² single-sided copper for full 1.3 W power dissipation at T_amb = 25 °C per IEC 134 limiting values.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−60 V - maximum safe collector-emitter voltage with base open; defines usable supply rail headroom in PNP high-side switches
I_C (DC)	−1 A - continuous collector current rating; sets maximum load drive capability without forced cooling
h_FE	100–300 @ −100 mA - DC current gain range confirming stable biasing in linear amplifiers and saturated switches
V_CE(sat)	≤ −500 mV @ −500 mA - low saturation voltage ensures <0.25 W conduction loss at rated current
f_T	100 MHz - transition frequency enabling reliable operation up to ~10 MHz square-wave switching
R_{th j-a}	93 K/W - junction-to-ambient thermal resistance on standard PCB; determines temperature rise under 1 W dissipation

Pinout & Package

SOT223 plastic surface-mount package with 4 leads: pins 2 and 4 are internally connected to the collector (exposed thermal pad), pin 1 is base, and pin 3 is emitter. The large collector pad enables efficient heat transfer to PCB copper.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control terminal for forward-biasing the BE junction; requires current-limited drive to avoid exceeding I_BM = −200 mA
2, 4	Collector	Common high-current output node with internal connection to thermal pad; must be soldered to ≥1 cm² copper for rated power
3	Emitter	Reference terminal for PNP operation; connects to higher potential rail in high-side switch configurations

Key Features

Feature	Design Value
High current capability	Rated −1 A DC collector current supports direct driving of relays, solenoids, and LED arrays without external buffering
Low saturation voltage	V_CE(sat) ≤ −500 mV at −500 mA reduces conduction losses and self-heating in power-switching applications
Robust thermal design	SOT223 package with integrated collector pad achieves R_{th j-s} = 12 K/W, enabling reliable operation on standard FR-4 PCBs
Wide operating temperature	Specified from −65 °C to +150 °C junction temperature, supporting industrial and telecom environments

Applications

Telephony Line Interface

Industrial Power Control

Use Scenario: Driving analog telephone line hybrid circuits and ring detection stages in PBX and VoIP gateways.

IC Role / Device Role / Timing Role: PNP high-side switch controlling line feed current and polarity reversal.

Use Value: −60 V V_CEO withstands ringing voltage transients; low V_CE(sat) minimizes power loss during sustained talk current.

Use Scenario: Controlling 24 V DC solenoid valves and pneumatic actuators in PLC I/O modules.

IC Role / Device Role / Timing Role: Medium-power PNP switch interfacing microcontroller GPIO to inductive loads.

Use Value: −1 A rating handles typical solenoid surge currents; h_FE ≥ 100 ensures reliable saturation with 5 mA base drive.

DC Motor Direction Control

LED Array Driver

Use Scenario: Complementing NPN devices (e.g., BSP41) in H-bridge half-bridge legs for bidirectional 12 V DC motor control.

IC Role / Device Role / Timing Role: High-side PNP switch providing reverse current path in push-pull topology.

Use Value: Matched V_CEO/I_C ratings with BSP41 enable symmetrical bridge performance; f_T = 100 MHz supports PWM up to 20 kHz.

Use Scenario: Constant-current sinking driver for multi-segment 7-segment displays and status indicator banks.

IC Role / Device Role / Timing Role: Linear-mode PNP current source regulating LED brightness via base voltage control.

Use Value: Tight h_FE spread (100–300) enables predictable current setting; low V_BE(sat) ≤ −1.2 V simplifies bias network design.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP medium-power transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ZTX618	Higher V_CEO (−100 V), lower h_FE (20–120), TO-92 package	Lacks SOT223 thermal pad; unsuitable for >0.5 W continuous dissipation	Select when higher breakdown voltage is critical and board space allows leaded package
MMBT3906	Lower I_C (−200 mA), SOT-23 package, faster switching (t_off = 45 ns)	Insufficient current rating for relay/solenoid drive; limited to signal-level switching	Select only for low-power logic inversion or bias networks where footprint is constrained

Compared with ZTX618 and MMBT3906, BSP31,115 uniquely balances −1 A current, −60 V rating, and SOT223 thermal performance-making it the only option among the three qualified for sustained 1 W power switching in compact industrial PCB layouts.

Availability

BSP31,115 is available at Aetrix Electronics and suitable for telephony infrastructure, industrial PLC I/O modules, and DC motor control systems requiring stable component supply across multi-year production cycles.

Supply support for BSP31,115 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 leader in discrete, logic, and PowerMOS semiconductors, spun off from NXP's Standard Products division in 2017 and focused on automotive, industrial, computing, and consumer markets.

BSP31,115 belongs to Nexperia's legacy PNP medium-power transistor product line, engineered specifically for robustness in telephony and industrial power interface applications where reliability under sustained current and thermal stress is essential.

FAQ

Is BSP31,115 pin-compatible with BSP32 or BSP33?

No. While all three share the same SOT223 package and pinout (pins 1–4), BSP32 and BSP33 have higher voltage ratings (−90 V V_CBO, −80 V V_CEO) and different h_FE ranges. Substitution requires verification of voltage margin and gain requirements in the target circuit.

Can BSP31,115 replace an NPN transistor in the same circuit?

No-it is a PNP device with opposite polarity and complementary functionality. Direct replacement would invert logic states and likely cause circuit failure. Use its NPN complement BSP41 or BSP43 for matched push-pull designs.

What is the maximum allowable PCB copper area for the collector pad?

The datasheet specifies 1 cm² single-sided copper for full 1.3 W power dissipation at 25 °C ambient. Larger copper areas improve thermal performance but require matching solder mask openings and thermal relief design to ensure manufacturable reflow profiles.

Does BSP31,115 support pulse operation beyond its DC current rating?

Yes-peak collector current is rated at −2 A for short pulses (t_p ≤ 300 μs, duty cycle ≤ 1%). This enables brief surge handling for relay coil energization or motor stall conditions, provided average power remains within 1.3 W limits.

BSP31,115 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: PNP

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

Voltage - Collector Emitter Breakdown (Max):: 60 V

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 50mA, 500mA

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 100mA, 5V

Power - Max:: 1.3 W

Frequency - Transition:: 100MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-223

BSP31,115 FAQ

1.How can I place an order for BSP31,115 through Aetrix?

Please submit a Request for Quotation (RFQ) for BSP31,115 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 BSP31,115 reliable?

The price and inventory of BSP31,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BSP31,115 is usually 5 days.

3.What payment methods are accepted for BSP31,115?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BSP31,115 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BSP31,115?

BSP31,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BSP31,115 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 BSP31,115?

For technical support, including BSP31,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BSP31,115 requirements.

6.How does Aetrix verify that BSP31,115 is sourced from the original manufacturer or authorized distributors?

All BSP31,115 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 BSP31,115 meets industry standards.

7.What is the process for return or replacement of BSP31,115?

All BSP31,115 units undergo pre-shipment inspection (PSI). If there is an issue with BSP31,115, 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 BSP31,115 part is unused and in its original packaging.

Return procedure for BSP31,115:

1.Submit a request within 90 days.

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

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