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Nexperia USA Inc. PMBTA42-QR
- Part No.:
- PMBTA42-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
PMBTA42-QR.pdf
- Description:
- TRANS NPN 300V 0.1A TO-236AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
PMBTA42-QR from Nexperia is a 300 V, 100 mA NPN high-voltage transistor in SOT23 package, designed for switching and amplification in high-voltage telephony interfaces and automotive signal conditioning circuits; features AEC-Q101 qualification, 500 mV VCE(sat) at IC = 20 mA/IB = 2 mA, 50 MHz fT, and 40–100 hFE at IC = 30 mA.
For engineers reviewing the PMBTA42-QR datasheet, PMBTA42-QR pinout, PMBTA42-QR application, or PMBTA42-QR equivalent, key selection criteria include high-voltage blocking capability (300 V VCEO), automotive-grade reliability (AEC-Q101), thermal resistance (500 K/W on FR4), and SOT23 footprint compatibility with space-constrained PCB layouts.
Technical Context
This discrete NPN bipolar junction transistor operates as a high-voltage switch or linear amplifier with open-base collector-emitter breakdown voltage of 300 V and maximum continuous collector current of 100 mA. Its DC current gain (hFE) ranges from 40 to 100 under standard test conditions (VCE = 10 V, IC = 30 mA, Tamb = 25 °C).
The device exhibits low saturation voltages-500 mV VCE(sat) and 900 mV VBE(sat)-enabling efficient switching in medium-speed, high-voltage interface stages. Its 50 MHz transition frequency and 3 pF feedback capacitance support stable operation up to ~10 MHz in small-signal amplification roles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 300 V - supports direct interface with telephone line voltages and automotive 24 V/48 V systems with margin. |
| IC (max) | 100 mA - suitable for driving relays, optocouplers, and logic-level translators in HV control paths. |
| hFE | 40–100 - enables predictable base drive design for saturated switching with minimal overdrive. |
| VCE(sat) | 500 mV @ IC=20 mA/IB=2 mA - reduces conduction loss and self-heating in pulsed switching applications. |
| fT | 50 MHz - permits use in audio-frequency amplifiers and fast digital signal buffering up to ~10 MHz. |
| Rth(j-a) | 500 K/W - requires thermal-aware layout on FR4 PCBs; derating needed above 25 °C ambient. |
Pinout & Package
Package: SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Current-controlled input node; requires series resistor to limit IB ≤ 100 mA peak per datasheet limiting values. |
| 2 | Emitter (E) | Common reference terminal for NPN configuration; connects to ground or low-side return path. |
| 3 | Collector (C) | High-voltage output node; rated for 300 V blocking and 100 mA continuous current. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive temperature range (−65 °C to +150 °C) and mechanical stress testing per JESD22 standards. |
| 300 V VCEO | Enables direct integration into off-hook detection, ring signal handling, and HV bias generation without external level-shifting. |
| SOT23 footprint | Compatible with standard reflow/wave soldering footprints (sot023_fr/sot023_fw); supports automated assembly and board density optimization. |
| Low VCE(sat) | 500 mV saturation voltage minimizes power dissipation during ON-state, improving efficiency in pulsed load switching. |
Applications
| Telephone Line Interface | Automotive Sensor Signal Conditioning |
|---|---|
Use Scenario: Off-hook detection and ringing signal isolation in analog telephony equipment. IC Role / Device Role / Timing Role: High-voltage NPN switch isolating ±90 V AC ring signals while maintaining DC bias integrity. Use Value: 300 V VCEO withstands peak ring voltages; low VCE(sat) ensures minimal insertion loss in active signal paths. |
Use Scenario: Level-shifting and buffering of Hall-effect or inductive sensor outputs in 12 V/24 V automotive ECUs. IC Role / Device Role / Timing Role: Discrete NPN amplifier stage converting low-current sensor signals to robust logic-compatible levels. Use Value: AEC-Q101 qualification guarantees reliability across temperature cycling; hFE stability supports consistent gain calibration. |
| Industrial Power Supply Feedback | Legacy Communication Equipment |
Use Scenario: Optocoupler driver in isolated flyback converter feedback loops requiring >200 V standoff. IC Role / Device Role / Timing Role: High-voltage switch controlling LED current in secondary-side error amplifiers. Use Value: 300 V VCEO and 200 mA ICM support safe operation during transient overvoltage events. |
Use Scenario: Signal routing and relay driving in PBX systems and professional analog communication hardware. IC Role / Device Role / Timing Role: General-purpose high-voltage switching element for analog multiplexing and line supervision. Use Value: SOT23 package enables compact multi-channel designs; 50 MHz fT supports clean pulse transmission up to 5 MHz. |
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 |
|---|---|---|---|
| BC847B-Q | Lower VCEO (45 V), higher hFE (200–450), same SOT23 package | Not suitable for >100 V applications; limited to low-voltage logic interfacing and general amplification | Select only when system voltage remains below 45 V and high gain is prioritized over HV capability. |
| MPSA42 | Same 300 V VCEO, TO-92 through-hole package, higher Ptot (625 mW) | Requires manual or wave-soldered through-hole assembly; unsuitable for fully SMT production | Choose when board-level thermal management allows larger footprint and higher power dissipation is required. |
Compared with BC847B-Q and MPSA42, PMBTA42-QR uniquely combines automotive qualification, SOT23 surface-mount compatibility, and full 300 V blocking in a single solution-making it optimal for space-constrained, high-reliability HV switching where both form factor and ruggedness are critical.
Availability
PMBTA42-QR is available at Aetrix Electronics and suitable for telephone line interface, automotive sensor conditioning, and industrial power supply feedback applications requiring stable component supply and long-term lifecycle assurance.
Supply support for PMBTA42-QR 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 advanced packaging technologies.
PMBTA42-QR belongs to Nexperia's AEC-Q101-qualified high-voltage transistor product line, engineered specifically for robust signal switching and amplification in harsh-environment telephony, automotive, and industrial systems.
FAQ
Is PMBTA42-QR pin-compatible with standard SOT23 NPN transistors like BC847?
No-while both use SOT23 packages, PMBTA42-QR has Base-Emitter-Collector pinout (1-B, 2-E, 3-C), whereas BC847 variants commonly use E-B-C (1-E, 2-B, 3-C). Incorrect PCB layout will cause functional failure; verify pin assignment using Nexperia's official package outline diagram.
What is the maximum allowable base current for continuous operation?
The absolute maximum peak base current is 100 mA per datasheet limiting values, but for continuous DC operation, base current must be limited to ensure IC ≤ 100 mA and junction temperature stays below 150 °C. With hFE ≥ 40, typical IB should not exceed 2.5 mA for 100 mA IC in linear mode.
Does PMBTA42-QR support operation at −65 °C?
Yes-its specified storage and operating ambient temperature range is −65 °C to +150 °C, and it is AEC-Q101 qualified for automotive use, which includes extended cold-temperature performance validation such as low-temperature operational life testing and thermal shock cycles.
Can PMBTA42-QR replace MPSA42 in existing TO-92 designs?
Electrically yes-both share identical VCEO (300 V), IC (100 mA), and similar hFE-but mechanically no: PMBTA42-QR uses SOT23 surface-mount packaging versus TO-92 through-hole. A redesign of PCB footprint, soldering process, and thermal layout is required for migration.
PMBTA42-QR 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-QR FAQ
1.How can I place an order for PMBTA42-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for PMBTA42-QR 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-QR reliable?
The price and inventory of PMBTA42-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PMBTA42-QR is usually 5 days.
3.What payment methods are accepted for PMBTA42-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PMBTA42-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PMBTA42-QR?
PMBTA42-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PMBTA42-QR 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-QR?
For technical support, including PMBTA42-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PMBTA42-QR requirements.
6.How does Aetrix verify that PMBTA42-QR is sourced from the original manufacturer or authorized distributors?
All PMBTA42-QR 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-QR meets industry standards.
7.What is the process for return or replacement of PMBTA42-QR?
All PMBTA42-QR units undergo pre-shipment inspection (PSI). If there is an issue with PMBTA42-QR, 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-QR part is unused and in its original packaging.
Return procedure for PMBTA42-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PMBTA42-QR Tags
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