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

Nexperia USA Inc. PMBTA42-QZ

Name: PMBTA42-QZ
Brand: Nexperia USA Inc.
SKU: PMBTA42-QZ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PMBTA42-QZ

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: PMBTA42-QZ.pdf

Description:: TRANS NPN 300V 0.1A TO-236AB

Quantity:: RFQ Add To RFQ list

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Inventory:25,700

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Product details

Overview

PMBTA42-QZ from Nexperia is a 300 V, 100 mA NPN high-voltage general-purpose transistor in SOT23 package, designed for switching and amplification in high-voltage telephony interfaces, automotive signal conditioning, and industrial control logic stages. It delivers 40 minimum DC current gain at 30 mA collector current, 500 mV max V_CE(sat), and supports 150 °C junction temperature operation.

For engineers reviewing the PMBTA42-QZ datasheet, PMBTA42-QZ pinout, PMBTA42-QZ application, or PMBTA42-QZ equivalent, key selection criteria include its AEC-Q101 qualification, 300 V V_CEO rating, SOT23 thermal resistance (500 K/W), and verified performance in high-impedance base-driven switching circuits.

Technical Context

This discrete NPN bipolar junction transistor operates with open-base collector-emitter breakdown voltage rated at 300 V and supports continuous collector current up to 100 mA. Its DC current gain (h_FE) is specified at 40 minimum under 30 mA I_C, 10 V V_CE, and 25 °C ambient conditions.

The device features low leakage: 100 nA max I_CBO at 200 V V_CB, and fast dynamic response with 50 MHz transition frequency (f_T) at 20 V V_CE, 10 mA I_C. Thermal design is constrained by 500 K/W junction-to-ambient resistance on standard FR4 PCB.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	300 V - Enables direct interface with telephone line ringing voltages and automotive 24 V/48 V systems with margin.
I_C	100 mA - Supports medium-power switching loads such as relays, LED drivers, and sensor biasing circuits.
h_FE	40 min at I_C = 30 mA - Ensures reliable saturation with modest base drive in linear and switching applications.
V_CE(sat)	500 mV max - Minimizes conduction loss and self-heating during active switching in power control paths.
f_T	50 MHz - Supports audio-frequency amplification and fast digital signal switching up to ~5–10 MHz.
R_th(j-a)	500 K/W - Requires careful PCB copper area planning for sustained >50 mA operation at elevated ambient temperatures.

Pinout & Package

SOT23 plastic surface-mount package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm lead pitch, 3-terminal configuration with gull-wing leads.

Pin/Terminal	Circuit Role	Design Meaning
1	Base (B)	Current-controlled input node; requires series resistor to limit I_B ≤ 100 mA peak per datasheet limiting values.
2	Emitter (E)	Common reference terminal; connected to ground or low-side return path in common-emitter configurations.
3	Collector (C)	High-voltage output node; handles up to 300 V reverse-biased when off and conducts load current when saturated.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD22 standards.
300 V V_CEO	Supports direct connection to telecom ring signals (≈90 V RMS, 135 V peak) and industrial 24/48 V bus transients without external clamping.
Low I_CBO (100 nA)	Enables stable high-impedance bias networks and low-leakage standby operation in battery-powered monitoring circuits.
SOT23 footprint	Compatible with standard reflow and wave soldering profiles; uses industry-standard 0.6 mm pad width and 1.9 mm pitch layout.

Applications

Telephone Line Interface

Automotive Signal Conditioning

Use Scenario: Driving analog telephone line ringing detection and off-hook signaling circuits in VoIP gateways and PBX systems.

IC Role / Device Role / Timing Role: High-voltage NPN switch isolating microcontroller GPIO from ±135 V ringing transients while providing current gain for relay or optocoupler drive.

Use Value: Eliminates need for external transient voltage suppressors due to 300 V V_CEO, reducing BOM count and board space.

Use Scenario: Level-shifting and buffering sensor outputs (e.g., throttle position, coolant temp) in 12 V/24 V automotive ECUs.

IC Role / Device Role / Timing Role: Discrete NPN amplifier stage converting low-current analog sensor signals to robust 5 V CMOS-compatible levels with noise immunity.

Use Value: AEC-Q101 qualification ensures operation across –40 °C to +125 °C ambient, meeting ISO 16750-4 requirements.

Industrial Control Logic

LED Driver for High-Voltage Indicators

Use Scenario: Isolating PLC output modules from 24 V DC field wiring with surge protection and galvanic separation.

IC Role / Device Role / Timing Role: Medium-speed switching transistor controlling solid-state relays or opto-isolator inputs in programmable logic controllers.

Use Value: 100 mA I_C rating and 500 mV V_CE(sat) enable efficient drive of 24 V indicator LEDs and small solenoids without heatsinking.

Use Scenario: Driving high-brightness status LEDs in industrial HMIs where supply rails reach 48 V DC.

IC Role / Device Role / Timing Role: Constant-current switch regulating LED current via emitter resistor feedback in common-emitter topology.

Use Value: 300 V V_CEO allows direct connection to 48 V bus with headroom for inductive kickback, avoiding dedicated LED driver ICs.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC817-40-Q	Lower V_CEO (45 V), higher h_FE (250 min), same SOT23 package	Not suitable for >60 V applications; limited to low-voltage logic-level switching	Select only if system voltage remains ≤45 V and higher gain is prioritized over voltage rating.
MPSA42	Same 300 V V_CEO, TO-92 through-hole package, no AEC-Q101 qualification	Lacks automotive qualification; larger footprint; unsuitable for automated SMT assembly	Choose only for prototyping or legacy through-hole designs where AEC-Q101 compliance is not required.

Compared with BC817-40-Q and MPSA42, PMBTA42-QZ uniquely combines AEC-Q101 qualification, SOT23 surface-mount compatibility, and full 300 V capability-making it the only option qualified for production automotive and telecom infrastructure applications requiring all three attributes.

Availability

PMBTA42-QZ is available at Aetrix Electronics and suitable for telephone line interface, automotive signal conditioning, and industrial control logic requiring stable component supply and long-term lifecycle support.

Supply support for PMBTA42-QZ 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 essential semiconductors, serving automotive, industrial, and consumer markets with discrete, logic, and MOSFET solutions.

The PMBTA42-QZ belongs to Nexperia's AEC-Q101-qualified high-voltage bipolar transistor product line, engineered specifically for robust signal switching in harsh environments where voltage transients and extended temperature operation are critical.

FAQ

Is PMBTA42-QZ pin-compatible with standard SOT23 NPN transistors like BC847?

No. While both use SOT23 packaging, PMBTA42-QZ has Base–Emitter–Collector pinout (1–2–3), whereas BC847 follows Emitter–Base–Collector (1–2–3). Incorrect PCB layout will result in functional failure. Always verify pin assignment using Table 2 in the official Nexperia datasheet.

Can PMBTA42-QZ be used in linear amplifier configurations?

Yes, but with strict thermal limits. Its 250 mW P_tot and 500 K/W R_th(j-a) restrict continuous linear operation to <50 mW dissipation at 25 °C ambient. For audio preamplifier use, derate power by 2.5 mW/°C above 25 °C and ensure adequate copper pour on the collector pad.

What is the maximum safe base current for PMBTA42-QZ in switching mode?

The absolute maximum peak base current is 100 mA (single pulse, t_p ≤ 1 ms). For continuous DC switching, limit I_B to ≤10 mA to maintain reliability and avoid second breakdown. Use a series resistor ≥1 kΩ when driving from 5 V logic to ensure I_B stays within 5 mA typical for 100 mA I_C saturation.

Does PMBTA42-QZ require special PCB layout considerations for high-voltage operation?

Yes. Maintain ≥0.5 mm creepage distance between collector and other traces, especially on the top layer. Use solder mask-defined pads and avoid vias near the collector pad. For 300 V operation, reinforce clearance with slotting or isolation gaps per IPC-2221 Class B requirements to prevent arcing or surface tracking.

PMBTA42-QZ Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

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:: 250 mW

Frequency - Transition:: 50MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

PMBTA42-QZ FAQ

1.How can I place an order for PMBTA42-QZ through Aetrix?

Please submit a Request for Quotation (RFQ) for PMBTA42-QZ 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 PMBTA42-QZ reliable?

The price and inventory of PMBTA42-QZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PMBTA42-QZ is usually 5 days.

3.What payment methods are accepted for PMBTA42-QZ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PMBTA42-QZ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PMBTA42-QZ?

PMBTA42-QZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PMBTA42-QZ 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 PMBTA42-QZ?

For technical support, including PMBTA42-QZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PMBTA42-QZ requirements.

6.How does Aetrix verify that PMBTA42-QZ is sourced from the original manufacturer or authorized distributors?

All PMBTA42-QZ 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 PMBTA42-QZ meets industry standards.

7.What is the process for return or replacement of PMBTA42-QZ?

All PMBTA42-QZ units undergo pre-shipment inspection (PSI). If there is an issue with PMBTA42-QZ, 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 PMBTA42-QZ part is unused and in its original packaging.

Return procedure for PMBTA42-QZ:

1.Submit a request within 90 days.

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

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