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

Nexperia USA Inc. PXTA42-QF

Name: PXTA42-QF
Brand: Nexperia USA Inc.
SKU: PXTA42-QF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PXTA42-QF

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: TO-243AA

Datasheet:: PXTA42-QF.pdf

Description:: TRANS NPN 300V 0.1A SOT-89

Quantity:: RFQ Add To RFQ list

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Inventory:1,003

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Product details

Overview

PXTA42-QF from Nexperia is a 300 V, 100 mA NPN high-voltage transistor in SOT89 (SC-62) package, designed for switching applications requiring high breakdown voltage and automotive-grade reliability. It delivers DC current gain (h_FE) ≥40 at I_C = 30 mA, V_CE = 10 V, and supports peak collector current up to 200 mA. Used in electronic ballasts, LED chain drivers, and automotive motor management circuits.

For engineers reviewing the PXTA42-QF datasheet, PXTA42-QF pinout, PXTA42-QF application, or PXTA42-QF equivalent, key selection criteria include V_CEO = 300 V, I_C = 100 mA, AEC-Q101 qualification, thermal resistance R_th(j-sp) = 16 K/W, and SOT89 mounting compatibility with 6 cm² collector pad on FR4 PCB.

Technical Context

This NPN bipolar junction transistor operates as a medium-power high-voltage switch with open-base collector-emitter breakdown voltage rated at 300 V and emitter-base voltage limit of 6 V. Its DC current gain is specified at 40 minimum under V_CE = 10 V and I_C = 30 mA, with saturation voltages V_CE(sat) ≤ 500 mV and V_BE(sat) ≤ 900 mV at I_C = 20 mA / I_B = 2 mA.

Thermal performance is defined for mounting on single-sided tin-plated FR4 PCB with 6 cm² collector pad: R_th(j-a) = 96 K/W (free air), R_th(j-sp) = 16 K/W (solder point). Transition frequency f_T is 50 MHz at V_CE = 20 V, I_C = 10 mA, 100 MHz test condition.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	300 V - Maximum safe collector-emitter voltage with base open; enables use in 277 V AC ballast and 24 V automotive SMPS primary-side switching.
I_C	100 mA - Continuous collector current rating; defines steady-state load drive capability in LED chain and HID lamp control.
h_FE	≥40 - Minimum DC current gain at V_CE = 10 V, I_C = 30 mA; ensures reliable base drive margin in linear and saturated switching modes.
V_CE(sat)	≤500 mV - Low saturation voltage at I_C = 20 mA, I_B = 2 mA; reduces conduction loss and self-heating in pulsed operation.
R_th(j-sp)	16 K/W - Junction-to-solder-point thermal resistance; enables predictable thermal design when mounted per recommended 6 cm² FR4 copper pad.
f_T	50 MHz - Transition frequency at V_CE = 20 V, I_C = 10 mA; supports stable switching up to ~5–10 MHz practical operating frequencies.
C_re	3 pF - Feedback capacitance at V_CB = 20 V; limits Miller effect in high-speed switching and improves turn-off behavior.

Pinout & Package

SOT89 (SC-62) plastic surface-mounted package: 3 leads, 1.5 mm pitch, 4.5 mm × 2.5 mm × 1.5 mm body. Collector tab forms exposed metal pad for thermal and electrical connection.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter (E)	Current return path; connected to ground or low-side reference; requires low-inductance trace routing in switching layouts.
2	Collector (C)	Main power output terminal; electrically and thermally tied to exposed copper pad; must be routed to ≥6 cm² FR4 copper area.
3	Base (B)	Control input; driven by digital or analog signal source; requires series resistor to limit I_B ≤ 100 mA peak per limiting values.

Key Features

Feature	Design Value
AEC-Q101 qualified	Stress-tested for automotive discrete semiconductor requirements including temperature cycling, HTRB, and ESD; suitable for under-hood and chassis-mounted modules.
High V_CEO = 300 V	Supports direct interface with 277 V AC mains-derived rails and 48 V/60 V transient-tolerant automotive systems without external clamping.
Low V_CE(sat) ≤ 500 mV	Minimizes power dissipation during on-state operation, enabling higher efficiency in LED driver and ballast topologies with limited heatsinking.
R_th(j-sp) = 16 K/W	Enables accurate junction temperature estimation using solder point temperature measurement, critical for thermal safety compliance in automotive designs.

Applications

Electronic Ballast Control

LED Chain Driver

Use Scenario: High-frequency switching in fluorescent lamp ballasts operating from 220–277 V AC rectified rails.

IC Role / Device Role / Timing Role: Main switching transistor controlling resonant tank current and lamp ignition timing.

Use Value: 300 V V_CEO withstands line transients; 50 MHz f_T supports >20 kHz operation; low C_re reduces gate drive losses.

Use Scenario: Constant-current switching regulator driving strings of 10–20 white LEDs in commercial lighting fixtures.

IC Role / Device Role / Timing Role: Primary-side current-switching element in buck or buck-boost topology.

Use Value: 100 mA I_C rating matches typical string currents; V_CE(sat) ≤ 500 mV maintains >92% efficiency at full load.

HID Front Lighting

Automotive Motor Management

Use Scenario: Ignition pulse generation and arc sustainment in automotive xenon headlamps (35–55 W).

IC Role / Device Role / Timing Role: High-voltage switch triggering igniter transformer and regulating lamp power.

Use Value: AEC-Q101 qualification ensures reliability across -40 °C to +125 °C ambient; 200 mA I_CM handles ignition surge peaks.

Use Scenario: PWM-controlled actuator drivers (e.g., radiator fan, HVAC blower, fuel pump relay interface) in 12 V/24 V vehicle systems.

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

Use Value: 300 V V_CEO suppresses flyback spikes from 24 V motors; R_th(j-sp) = 16 K/W allows direct thermal monitoring via PCB sensor.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage NPN switching transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BCX56-16Q	V_CEO = 80 V, I_C = 1 A, h_FE = 100–250; SOT89 package but lower voltage rating.	Not suitable for 277 V ballast or HID ignition; limited to 24 V/48 V automotive loads.	Select only where system voltage < 60 V and higher current (>500 mA) is required.
PHPT60603SQ	V_CEO = 60 V, I_C = 3 A, h_FE = 100–300; TO-252 package, higher power, no AEC-Q101.	Lacks automotive qualification and 300 V capability; intended for industrial SMPS, not lighting or automotive.	Choose when thermal budget allows larger package and AEC-Q101 is not mandated.

Compared with BCX56-16Q and PHPT60603SQ, PXTA42-QF uniquely combines 300 V rating, AEC-Q101 qualification, and SOT89 footprint-enabling compact, automotive-compliant high-voltage switching where alternatives either lack voltage headroom or formal automotive validation.

Availability

PXTA42-QF is available at Aetrix Electronics and suitable for electronic ballast control, LED chain driver modules, and automotive motor management systems requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant sourcing.

Supply support for PXTA42-QF 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 semiconductors, delivering high-performance, reliable components for automotive, industrial, and consumer markets with emphasis on efficiency and miniaturization.

PXTA42-QF belongs to Nexperia's AEC-Q101-qualified high-voltage bipolar transistor product line, engineered specifically for robust switching in automotive lighting, power conversion, and industrial control applications demanding extended voltage range and thermal stability.

FAQ

What is the maximum allowable junction temperature for PXTA42-QF?

The absolute maximum junction temperature (T_j) is 150 °C per IEC 60134 limiting values. Operation above this threshold risks permanent degradation. Derating is required above ambient temperatures exceeding 25 °C, especially when dissipating >0.5 W-use R_th(j-sp) = 16 K/W with measured solder point temperature to infer T_j.

Is PXTA42-QF pin-compatible with PXTA92-Q?

No-PXTA42-QF is an NPN transistor while PXTA92-Q is its PNP complement. Both share identical SOT89 pinning (E-C-B), but polarity reversal means direct substitution would invert circuit function. They are complementary devices intended for push-pull or dual-rail configurations-not drop-in replacements.

Can PXTA42-QF be used in linear amplifier mode?

It is not optimized for linear amplification. While h_FE and V_CE(sat) are specified, the datasheet provides no small-signal parameters (e.g., f_T linearity, noise figure, distortion) or bias stability data for analog gain stages. Its design focus is saturated switching, not Class-A/B amplification.

What is the meaning of the "%1D" marking code on PXTA42-QF?

The marking "%1D" consists of a placeholder "%" for Nexperia manufacturing site code, "1" indicating device variant or process lot identifier, and "D" denoting the PXTA42-Q series. This code aligns with Nexperia's standard SOT89 marking convention and does not encode date or revision-full traceability requires scanning the full top-mark and matching against Nexperia's internal lot database.

PXTA42-QF Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: TO-243AA

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 100 mA

Voltage - Collector Emitter Breakdown (Max):: 300 V

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 2mA, 20mA

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 40 @ 30mA, 10V

Power - Max:: 1.3 W

Frequency - Transition:: 50MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-89

PXTA42-QF FAQ

1.How can I place an order for PXTA42-QF through Aetrix?

Please submit a Request for Quotation (RFQ) for PXTA42-QF 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 PXTA42-QF reliable?

The price and inventory of PXTA42-QF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PXTA42-QF is usually 5 days.

3.What payment methods are accepted for PXTA42-QF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PXTA42-QF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PXTA42-QF?

PXTA42-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PXTA42-QF 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 PXTA42-QF?

For technical support, including PXTA42-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PXTA42-QF requirements.

6.How does Aetrix verify that PXTA42-QF is sourced from the original manufacturer or authorized distributors?

All PXTA42-QF 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 PXTA42-QF meets industry standards.

7.What is the process for return or replacement of PXTA42-QF?

All PXTA42-QF units undergo pre-shipment inspection (PSI). If there is an issue with PXTA42-QF, 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 PXTA42-QF part is unused and in its original packaging.

Return procedure for PXTA42-QF:

1.Submit a request within 90 days.

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

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