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

Nexperia USA Inc. PXTA14,115

Name: PXTA14,115
Brand: Nexperia USA Inc.
SKU: PXTA14,115
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PXTA14,115

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: TO-243AA

Datasheet:: PXTA14,115.pdf

Description:: TRANS NPN DARL 30V 0.5A SOT-89

Quantity:: RFQ Add To RFQ list

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Inventory:2,165

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Product details

Overview

PXTA14 from Nexperia is an NPN Darlington transistor in SOT89 package, designed for high-input-impedance preamplifier stages. It delivers DC current gain (h_FE) of 10,000–20,000 at IC = 10–100 mA, supports 30 V collector-base voltage (V_CBO), and handles up to 500 mA continuous collector current (I_C). Its low saturation voltage (V_CEsat ≤ 1.5 V at IC = 100 mA/IB = 0.1 mA) enables efficient switching in low-voltage interface circuits.

For engineers reviewing the PXTA14 datasheet, PXTA14 pinout, PXTA14 application, or PXTA14 equivalent, key selection criteria include verified Darlington current gain range, thermal resistance (R_th(j-a) = 96 K/W), SOT89 collector-pad thermal performance, and confirmed PNP complement PXTA64 for push-pull designs.

Technical Context

The PXTA14 integrates two cascaded NPN transistors in a monolithic Darlington configuration, delivering high h_FE with minimal base drive. Its internal structure includes emitter ballasting and optimized doping profiles to sustain I_C = 500 mA under T_amb ≤ 25 °C with proper PCB copper area (6 cm² collector pad).

It operates with V_BEon ≤ 2 V at IC = 100 mA and V_CE = 5 V, and achieves f_T = 125 MHz at IC = 30 mA/V_CE = 5 V - enabling use in audio-frequency amplification and medium-speed switching where gain-bandwidth trade-offs are critical.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CBO	30 V - maximum reverse bias before breakdown; defines safe input signal swing in common-emitter preamp stages
I_C (DC)	500 mA - continuous collector current rating; sets upper limit for load-driving capability in linear or saturated operation
h_FE	10,000–20,000 - DC current gain at IC = 10–100 mA; enables microampere-level base drive for milliampere output loads
V_CEsat	≤1.5 V - collector-emitter saturation voltage at IC = 100 mA/IB = 0.1 mA; determines conduction loss and heat generation in switch mode
R_th(j-a)	96 K/W - junction-to-ambient thermal resistance on 6 cm² single-sided copper; defines required PCB layout for thermal management
f_T	125 MHz - transition frequency at IC = 30 mA/V_CE = 5 V; indicates usable bandwidth for small-signal amplification up to ~10 MHz

Pinout & Package

SOT89 (SC-62) plastic surface-mount package with exposed collector pad for enhanced thermal dissipation; 3-lead outline compliant with JEDEC TO-243 and IEC standards.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Low-impedance output node; connected to ground or load return path in common-collector configurations
2	Collector	Main power-handling terminal; soldered to large copper area for thermal conduction and current routing
3	Base	High-impedance control input; requires current-limiting resistor to prevent overdrive and ensure stable Darlington turn-on

Key Features

Feature	Design Value
High DC current gain	h_FE ≥ 10,000 at IC = 10 mA - reduces base drive circuit complexity and power consumption in sensor interface stages
Low V_CEsat	≤1.5 V at rated current - minimizes voltage drop and self-heating during saturation, improving efficiency in driver applications
SOT89 thermal design	Exposed collector pad with R_th(j-s) = 16 K/W - enables direct thermal coupling to PCB copper, supporting >1 W dissipation with proper layout
Complementary PNP pair	PXTA64 available - allows matched push-pull output stages with symmetrical gain and thermal behavior

Applications

Audio Preamp Stage

Relay Driver Interface

Use Scenario: Low-noise, high-gain amplification of microphone or piezoelectric sensor signals prior to ADC sampling.

IC Role / Device Role / Timing Role: NPN Darlington configured as common-emitter voltage amplifier with emitter degeneration.

Use Value: 10,000–20,000 h_FE enables >40 dB voltage gain with minimal base current noise contribution and stable bias point.

Use Scenario: Driving 12 V/100 mA electromagnetic relay coils from microcontroller GPIO pins.

IC Role / Device Role / Timing Role: Switching transistor in saturated common-emitter configuration with base current limiting.

Use Value: V_CEsat ≤ 1.5 V ensures <150 mW dissipation at full load, eliminating need for heatsink in compact industrial control modules.

LED Current Regulator

Thermal Sensor Amplifier

Use Scenario: Constant-current source for high-brightness indicator LEDs in automotive dashboards.

IC Role / Device Role / Timing Role: Emitter-follower current buffer with precision sense resistor feedback.

Use Value: High h_FE maintains tight current regulation across temperature (−40 °C to +125 °C) with minimal base current drift.

Use Scenario: Amplifying low-level output from silicon bandgap or thermistor-based temperature sensors.

IC Role / Device Role / Timing Role: High-input-impedance preamplifier stage preceding instrumentation amplifier or ADC reference.

Use Value: Input impedance >1 MΩ (due to Darlington β multiplication) prevents loading of high-impedance sensor elements.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BCV27	Lower h_FE (2000–10,000), same SOT89 package, V_CBO = 30 V, I_C = 100 mA	Not suitable for >100 mA loads; limited to low-power preamp or signal buffering	Select when lower gain and reduced thermal demand suffice; not a drop-in replacement for 500 mA operation
MJD127	TO-252 package, higher I_C = 1 A, h_FE = 1000–8000, V_CBO = 60 V	Requires larger PCB footprint and different thermal layout; suited for higher-voltage industrial controls	Choose for 60 V systems or >500 mA loads; incompatible pinout and thermal mounting vs. SOT89

Compared with BCV27 and MJD127, PXTA14 uniquely balances 500 mA current handling, 30 V rating, and ultra-high h_FE in the space-constrained SOT89 package - making it optimal for compact, high-gain, medium-current analog interfaces where thermal budget and board area are tightly coupled.

Availability

PXTA14 is available at Aetrix Electronics and suitable for audio preamplifiers, relay driver interfaces, and LED current regulators requiring stable component supply across automotive, industrial control, and consumer electronics programs.

Supply support for PXTA14 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.

The PXTA14 belongs to Nexperia's high-gain Darlington transistor product line, engineered specifically for low-base-drive, high-output-current analog interface and driver applications in space-constrained environments.

FAQ

What is the maximum continuous collector current for PXTA14?

The PXTA14 is rated for 500 mA continuous collector current (I_C) at T_amb ≤ 25 °C with a 6 cm² copper mounting pad on a single-sided PCB. Derating applies above 25 °C per the R_th(j-a) = 96 K/W thermal resistance specification; at 70 °C ambient, max I_C drops to approximately 350 mA to maintain T_j ≤ 150 °C.

Is PXTA14 pin-compatible with any PNP Darlington devices?

Yes - the PXTA64 is the designated PNP complement, sharing identical SOT89 package dimensions, pinout (emitter/collector/base reversed), and matched electrical characteristics including h_FE range and V_CEO/V_EBO ratings. This pairing enables symmetrical push-pull output stages without layout redesign.

Can PXTA14 be used in switching applications above 100 kHz?

No - while its f_T is 125 MHz, the PXTA14's Darlington structure introduces significant storage time and slow turn-off behavior. Measured switching times (t_on/t_off) exceed 1 µs under typical conditions, limiting practical use to ≤10 kHz switching frequencies in relay or lamp drivers where speed is non-critical.

Does PXTA14 require external base resistors in all applications?

Yes - due to its extremely high h_FE, uncontrolled base current can cause thermal runaway or excessive power dissipation. A series base resistor is mandatory to limit I_B to ≤200 mA (absolute max) and ensure stable DC bias; typical values range from 10 kΩ (for 3.3 V MCU GPIO) to 47 kΩ (for 5 V logic), calculated using V_BEon ≈ 1.4–2.0 V and desired I_C.

PXTA14,115 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):: 500 mA

Voltage - Collector Emitter Breakdown (Max):: 30 V

Vce Saturation (Max) @ Ib, Ic:: 1.5V @ 100µA, 100mA

Current - Collector Cutoff (Max):: 100nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 20000 @ 100mA, 5V

Power - Max:: 1.3 W

Frequency - Transition:: 125MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-89

PXTA14,115 FAQ

1.How can I place an order for PXTA14,115 through Aetrix?

Please submit a Request for Quotation (RFQ) for PXTA14,115 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 PXTA14,115 reliable?

The price and inventory of PXTA14,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PXTA14,115 is usually 5 days.

3.What payment methods are accepted for PXTA14,115?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PXTA14,115 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PXTA14,115?

PXTA14,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PXTA14,115 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 PXTA14,115?

For technical support, including PXTA14,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PXTA14,115 requirements.

6.How does Aetrix verify that PXTA14,115 is sourced from the original manufacturer or authorized distributors?

All PXTA14,115 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 PXTA14,115 meets industry standards.

7.What is the process for return or replacement of PXTA14,115?

All PXTA14,115 units undergo pre-shipment inspection (PSI). If there is an issue with PXTA14,115, 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 PXTA14,115 part is unused and in its original packaging.

Return procedure for PXTA14,115:

1.Submit a request within 90 days.

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

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