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

Nexperia USA Inc. PZTA42-QX

Name: PZTA42-QX
Brand: Nexperia USA Inc.
SKU: PZTA42-QX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PZTA42-QX

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: PZTA42-QX.pdf

Description:: TRANS NPN 300V 0.1A SOT-223

Quantity:: RFQ Add To RFQ list

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Inventory:5,143

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Product details

Overview

PZTA42-Q from Nexperia is an AEC-Q101-qualified NPN high-voltage transistor in SOT223 (SC-73) package, designed for switching and amplification in high-voltage telephony interfaces. It supports V_CEO = 300 V, I_C = 100 mA continuous, h_FE ≥ 25 at 1 mA, and operates up to T_j = 150 °C - enabling robust line interface protection in professional telecom equipment.

For engineers reviewing the PZTA42-Q datasheet, PZTA42-Q pinout, PZTA42-Q application, or PZTA42-Q equivalent, key selection criteria include its 300 V collector-emitter blocking capability, automotive-grade reliability, thermal resistance R_th(j-sp) = 23 K/W, and dual-collector SOT223 layout for enhanced power dissipation in space-constrained PCBs.

Technical Context

This discrete NPN bipolar junction transistor uses epitaxial base construction for stable high-voltage operation and low leakage (I_CBO ≤ 20 nA at V_CB = 200 V). Its DC current gain varies from h_FE ≥ 25 (I_C = 1 mA) to ≥ 40 (I_C = 30 mA), supporting both small-signal amplification and medium-power switching.

The device features a thermally optimized SC-73 package with two collector leads (Pins 2 & 4) tied internally to a common heatsink pad, delivering R_th(j-a) = 104 K/W on standard FR4 and R_th(j-sp) = 23 K/W to solder point - critical for sustained 1.2 W power dissipation at T_amb ≤ 25 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	300 V - Enables direct interface with 200 V AC line-derived supplies without external voltage clamping.
I_C (continuous)	100 mA - Supports relay driving, LED biasing, and low-power signal switching in telecom line cards.
h_FE	25–40 - Provides predictable DC gain across 1–30 mA range for stable bias design in analog front-ends.
V_CE(sat)	≤ 500 mV - Minimizes conduction loss in saturated-switch applications like ring generator control.
R_th(j-sp)	23 K/W - Allows efficient heat transfer to PCB copper, enabling reliable operation without external heatsinks.
f_T	50 MHz - Supports audio-frequency amplification and fast digital switching up to ~5 MHz edge rates.
C_re	3 pF - Low feedback capacitance preserves stability in high-gain amplifier configurations.

Pinout & Package

SOT223 (SC-73) plastic surface-mount package with 4 leads, 2.3 mm pitch, 6.5 × 3.5 × 1.65 mm body, and integrated heatsink pad connected to both collector terminals.

Pin/Terminal	Circuit Role	Design Meaning
1	Base (B)	Control input; requires current-limited drive (I_B ≤ 100 mA peak) for safe saturation.
2	Collector (C)	Main high-voltage output node; electrically tied to Pin 4 and thermal pad for power handling.
3	Emiter (E)	Reference terminal; connects to ground or negative rail in common-emitter configurations.
4	Collector (C)	Duplicate collector terminal - must be routed to same net as Pin 2 to maintain thermal and electrical integrity.

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive underhood and infotainment systems requiring -65 °C to +150 °C operation.
Dual-collector SOT223 layout	Enables 1.2 W power dissipation with minimal PCB area via shared thermal pad and parallel current paths.
V_CEO = 300 V rating	Eliminates need for series Zener clamping in 200 V RMS telecom line interface circuits.
I_CBO ≤ 20 nA @ 200 V	Ensures low standby leakage in always-on monitoring circuits over full temperature range.

Applications

Telecom Line Interface

Automotive Sensor Interface

Use Scenario: High-voltage ringing circuit in VoIP gateways and PBX line cards.

IC Role / Device Role / Timing Role: NPN switch controlling 90 V RMS AC ring signal generation across telephone lines.

Use Value: 300 V V_CEO withstands peak line transients; dual-collector layout sustains 1.2 W during 2-second ring bursts.

Use Scenario: Signal conditioning for resistive temperature sensors in engine coolant modules.

IC Role / Device Role / Timing Role: Current source driver for PT100/PT1000 bridge excitation in harsh automotive environments.

Use Value: AEC-Q101 qualification ensures reliability at 150 °C junction temperature; h_FE stability enables precise 1 mA excitation current.

Industrial Power Supply Feedback

Professional Audio Output Stage

Use Scenario: Optocoupler-driven overvoltage protection in isolated 48 V DC-DC converters.

IC Role / Device Role / Timing Role: High-side switch activating crowbar circuit upon secondary-side fault detection.

Use Value: 300 V blocking capability isolates primary-side faults without cascading failure; low V_CE(sat) minimizes trip delay.

Use Scenario: Class-A emitter-follower buffer in studio microphone preamplifiers.

IC Role / Device Role / Timing Role: Low-noise, high-input-impedance output stage driving 600 Ω balanced lines.

Use Value: f_T = 50 MHz and C_re = 3 pF ensure wide bandwidth and minimal phase shift up to 20 kHz; low I_CBO prevents DC drift.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MPSA42	V_CEO = 300 V, I_C = 500 mA, but not AEC-Q101 qualified; TO-92 package limits power dissipation.	Lacks automotive qualification and thermal performance; suitable only for non-automotive, lower-power designs.	Select when cost sensitivity outweighs thermal or qualification requirements.
ZTX450	V_CEO = 300 V, h_FE ≥ 100, but R_th(j-a) = 200 K/W (TO-92); no dual-collector thermal path.	Higher gain but significantly worse thermal management; unsuitable for sustained >0.5 W operation.	Prefer only for low-duty-cycle, low-power amplification where gain trumps thermal headroom.

Compared with MPSA42 and ZTX450, PZTA42-Q uniquely combines AEC-Q101 compliance, dual-collector SOT223 thermal efficiency (R_th(j-sp) = 23 K/W), and guaranteed 300 V blocking - making it the sole choice for automotive or telecom applications demanding simultaneous reliability, power, and voltage capability.

Availability

PZTA42-Q is available at Aetrix Electronics and suitable for telecom line interface, automotive sensor excitation, industrial overvoltage protection, and professional audio output stages requiring stable component supply and long-term lifecycle support.

Supply support for PZTA42-Q 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 high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and energy-efficient solutions.

The PZTA42-Q belongs to Nexperia's AEC-Q101-qualified high-voltage transistor product line, engineered specifically for robust signal switching and amplification in automotive infotainment, telecom infrastructure, and industrial power systems.

FAQ

Is PZTA42-Q pin-compatible with standard SOT223 NPN transistors?

No - PZTA42-Q has a unique 4-pin SOT223 pinout with two collector terminals (Pins 2 and 4), unlike conventional 3-pin SOT223 transistors. PCB layout must allocate separate pads for both collectors and connect them to the same net and thermal plane to ensure rated power dissipation and reliability.

What is the maximum continuous power dissipation for PZTA42-Q on a standard PCB?

At T_amb ≤ 25 °C on single-sided 1 cm² tin-plated copper, PZTA42-Q delivers 1.2 W continuous power dissipation. This assumes proper thermal connection of both collector pins and the exposed pad to the copper pour; exceeding this requires derating per R_th(j-a) = 104 K/W or active cooling.

Does PZTA42-Q support linear (analog) operation, or is it intended only for switching?

PZTA42-Q supports both modes: its h_FE stability (25–40 across 1–30 mA) and low V_CE(sat) enable clean Class-A amplification, while its 300 V V_CEO and 200 mA I_CM support fast switching in high-voltage digital or pulse applications - verified in Nexperia's Characteristics section.

How does the AEC-Q101 qualification impact PZTA42-Q's use outside automotive applications?

AEC-Q101 qualification certifies PZTA42-Q for extreme temperature cycling (-65 °C to +150 °C), mechanical shock, and humidity exposure - directly improving field reliability in telecom, industrial, and medical equipment where environmental stress exceeds commercial-grade requirements.

PZTA42-QX 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:: 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):: 20nA (ICBO)

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

Power - Max:: 1.2 W

Frequency - Transition:: 50MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-223

PZTA42-QX FAQ

1.How can I place an order for PZTA42-QX through Aetrix?

Please submit a Request for Quotation (RFQ) for PZTA42-QX 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 PZTA42-QX reliable?

The price and inventory of PZTA42-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PZTA42-QX is usually 5 days.

3.What payment methods are accepted for PZTA42-QX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PZTA42-QX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PZTA42-QX?

PZTA42-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PZTA42-QX 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 PZTA42-QX?

For technical support, including PZTA42-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PZTA42-QX requirements.

6.How does Aetrix verify that PZTA42-QX is sourced from the original manufacturer or authorized distributors?

All PZTA42-QX 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 PZTA42-QX meets industry standards.

7.What is the process for return or replacement of PZTA42-QX?

All PZTA42-QX units undergo pre-shipment inspection (PSI). If there is an issue with PZTA42-QX, 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 PZTA42-QX part is unused and in its original packaging.

Return procedure for PZTA42-QX:

1.Submit a request within 90 days.

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

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