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Nexperia USA Inc. MMBTA42-QR
- Part No.:
- MMBTA42-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBTA42-QR.pdf
- Description:
- TRANS NPN 300V 0.1A TO-236AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,389
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Product details
Overview
MMBTA42-QR from Nexperia is an AEC-Q101-qualified NPN high-voltage transistor in SOT23 package, rated for 300 V VCEO, 100 mA IC, and 50 MHz fT, used as a switching element in telephony line interface circuits and automotive signal conditioning stages.
For engineers reviewing the MMBTA42-QR datasheet, MMBTA42-QR pinout, MMBTA42-QR application, or MMBTA42-QR equivalent, this page delivers verified electrical limits, thermal resistance (500 K/W), DC current gain range (40–100 at 10 mA), saturation voltage (≤500 mV), and automotive qualification status - all critical for high-voltage analog switch design and BOM validation.
Technical Context
This discrete NPN bipolar junction transistor operates with open-base collector-emitter breakdown up to 300 V and supports peak collector currents of 200 mA. Its 50 MHz transition frequency and low leakage (≤100 nA ICBO) enable stable high-voltage switching in narrow-pulse applications.
The device uses standard silicon BJT process architecture with base-emitter cutoff voltage ≤900 mV at 2 mA drive, and junction temperature rating up to 150 °C - confirming suitability for thermally constrained automotive cabin modules and telecom line cards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 300 V - supports direct interface with telephone line ringing voltages and automotive 24 V/48 V systems with margin. |
| IC | 100 mA continuous - sufficient for driving relays, optocouplers, and small solenoids in control logic. |
| hFE | 40–100 @ 10 mA - enables predictable base drive sizing without excessive current waste. |
| VCE(sat) | ≤500 mV @ IC = 20 mA - minimizes conduction loss and self-heating in on-state operation. |
| fT | 50 MHz - allows use in pulse-width modulated (PWM) signal conditioning up to ~5 MHz fundamental. |
| Rth(j-a) | 500 K/W - defines thermal derating curve on FR4 PCBs; requires layout attention above 125 mW dissipation. |
Pinout & Package
SOT23 plastic surface-mount package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm lead pitch, single-sided copper FR4 mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Current-controlled input node; requires series resistor to limit IB ≤100 mA peak per datasheet. |
| 2 | Emitter (E) | Common reference terminal; connects to ground or low-side return path in common-emitter configuration. |
| 3 | Collector (C) | High-voltage output node; handles up to 300 V transient when base is open or reverse-biased. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood and cabin applications per stress test requirements including HTGB, HTRB, and temperature cycling. |
| 300 V VCEO rating | Enables direct replacement of legacy high-voltage transistors (e.g., MPSA42) without external snubbers in telecom ring detection. |
| Low ICBO (≤100 nA) | Reduces standby leakage in always-on monitoring circuits, extending battery life in remote sensors. |
| SOT23 footprint compatibility | Drop-in replaceable with industry-standard SOT23-3 land pattern (0.6 mm solder paste pads, 1.9 mm pitch). |
Applications
| Telephony Line Interface | Automotive Cabin Control |
|---|---|
Use Scenario: Detecting and responding to 90 V AC ringing signals on POTS lines while isolating downstream logic. IC Role / Device Role / Timing Role: High-voltage NPN switch controlling optocoupler bias during ring detection window. Use Value: Withstands 300 V VCEO, avoids external clamping diodes, and maintains <100 nA leakage at 200 V bias. | Use Scenario: Driving LED indicators and small relays in HVAC control panels exposed to 12 V/24 V battery transients. IC Role / Device Role / Timing Role: Low-power saturated switch interfacing microcontroller GPIO to higher-current loads. Use Value: AEC-Q101 qualification ensures reliability across –40 °C to +125 °C ambient, with 500 mV VCE(sat) limiting heat generation. |
| Professional Audio Signal Routing | Industrial Sensor Interface |
Use Scenario: Muting audio paths during power-up sequencing to prevent pop noise in broadcast mixers. IC Role / Device Role / Timing Role: Fast-turnoff NPN shunt switch grounding signal lines until system stabilization. Use Value: 50 MHz fT ensures sub-microsecond turn-off, eliminating audible artifacts in 20 kHz bandwidth systems. | Use Scenario: Level-shifting and isolating 4–20 mA loop sensor outputs in PLC analog input modules. IC Role / Device Role / Timing Role: High-impedance emitter-follower buffer stage with rail-to-rail voltage tolerance. Use Value: 300 V VCBO withstands induced surges on long industrial cables; 150 °C Tj rating supports sealed enclosure operation. |
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 |
|---|---|---|---|
| MPSA42 | Same VCEO (300 V), but hFE min = 25 and Rth(j-a) = 625 K/W; no AEC-Q101 qualification. | Used in non-automotive industrial equipment where qualification is not required. | Select when cost sensitivity outweighs automotive compliance and thermal performance. |
| BCV61B | Lower VCEO (120 V), higher hFE (100–300), same SOT23 package; AEC-Q101 qualified. | Suitable only for ≤120 V applications such as 24 V CAN node protection or low-voltage relay drivers. | Choose for higher gain and automotive compliance where voltage stress is below 120 V. |
Compared with MPSA42 and BCV61B, MMBTA42-QR uniquely balances automotive qualification, 300 V capability, and 500 K/W thermal resistance - making it optimal for space-constrained, high-reliability 24–48 V systems requiring both surge immunity and thermal headroom.
Availability
MMBTA42-QR is available at Aetrix Electronics and suitable for telephony infrastructure, automotive cabin electronics, and industrial sensor interface designs requiring stable component supply and automotive-grade reliability.
Supply support for MMBTA42-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 essential semiconductors - delivering discrete, logic, and MOSFET solutions for automotive, industrial, and consumer markets.
MMBTA42-QR belongs to Nexperia's AEC-Q101-qualified high-voltage BJT product line, engineered specifically for robust switching in harsh environments where voltage transients and extended temperature operation are critical.
FAQ
Is MMBTA42-QR pin-compatible with MPSA42?
Yes - both use identical SOT23-3 pinout (1=Base, 2=Emitter, 3=Collector) and share the same mechanical footprint. However, MMBTA42-QR offers tighter hFE distribution (min 40 vs. 25), lower thermal resistance (500 vs. 625 K/W), and AEC-Q101 qualification absent in MPSA42.
What is the maximum safe operating voltage for MMBTA42-QR in continuous DC mode?
The absolute maximum VCEO is 300 V with open base, per IEC 60134 limiting values. For reliable continuous operation, Nexperia recommends staying ≤240 V DC to maintain >20% safety margin against transients and ensure long-term reliability at elevated temperatures.
Can MMBTA42-QR be used in linear amplifier configurations?
No - it is optimized for switching operation, not linear amplification. Its hFE variation with current and temperature, combined with limited SOA (Safe Operating Area) beyond 100 mA, makes it unsuitable for Class-A or AB analog gain stages. Use only in saturated or cutoff regions.
Does MMBTA42-QR require derating above 25 °C ambient?
Yes - total power dissipation must be linearly derated above 25 °C at 0.5 mW/°C due to its 500 K/W Rth(j-a). At 85 °C ambient, maximum allowable Ptot drops to 130 mW. Layout with thermal vias or copper pour is recommended for sustained >100 mW operation.
MMBTA42-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
MMBTA42-QR FAQ
1.How can I place an order for MMBTA42-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBTA42-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 MMBTA42-QR reliable?
The price and inventory of MMBTA42-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBTA42-QR is usually 5 days.
3.What payment methods are accepted for MMBTA42-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBTA42-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBTA42-QR?
MMBTA42-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBTA42-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 MMBTA42-QR?
For technical support, including MMBTA42-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBTA42-QR requirements.
6.How does Aetrix verify that MMBTA42-QR is sourced from the original manufacturer or authorized distributors?
All MMBTA42-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 MMBTA42-QR meets industry standards.
7.What is the process for return or replacement of MMBTA42-QR?
All MMBTA42-QR units undergo pre-shipment inspection (PSI). If there is an issue with MMBTA42-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 MMBTA42-QR part is unused and in its original packaging.
Return procedure for MMBTA42-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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