CNCHIPDEPOT Original Part
MMBTA42
MMBTA42 high-voltage NPN BJT transistor with 300V VCEO, 500mA collector current, 240mW power and SOT-23 package.
Transistor PolarityNPN
Collector-Emitter Voltage (VCEO)300 V
Collector Current (IC)500 mA
DC Current Gain (hFE)40 Min @ IC = 30 mA, VCE = 10 V
Power Dissipation (PD)240 mW
PackageSOT-23
Product Overview
The MMBTA42 is an NPN bipolar junction transistor designed for high-voltage switching, driver, and signal amplification applications. It features a 300V collector-emitter voltage rating, 500mA maximum collector current, and a minimum DC current gain of 40 at 30mA collector current. Its high breakdown voltage makes it suitable for discrete control and interface circuits operating well above the voltage range of typical small-signal transistors.
Packaged in a compact SOT-23 surface-mount package, the MMBTA42 is well suited to space-constrained high-voltage PCB designs. It can be used in level-shifting, high-voltage signal switching, discrete amplifier stages, and low-current control circuits.
Specifications
Key electrical, package, and sourcing parameters for quick engineering review.
| Part Number | MMBTA42 |
| Brand | CNCHIPDEPOT |
| Package | SOT-23 |
| Product Type | BJT |
| Transistor Polarity | NPN |
| Collector-Emitter Voltage (VCEO) | 300 V |
| Collector Current (IC) | 500 mA |
| DC Current Gain (hFE) | 40 Min @ IC = 30 mA, VCE = 10 V |
| Power Dissipation (PD) | 240 mW |
| Collector-Emitter Saturation Voltage (VCE(sat)) | 0.5 V Max @ IC = 20 mA, IB = 2 mA |
| Transition Frequency (fT) | 50 MHz |
| Operating Temperature | -55°C to +150°C (TJ) |
| Mounting Type | Surface Mount |
| Package / Case | TO-236-3 / SC-59 / SOT-23-3 |
| Collector Cutoff Current (ICBO) | 100 nA Max |
Cross Reference & Replacement Information
The following part numbers are commonly reviewed for replacement or compatibility matching. Always verify datasheet, package, pinout, and operating conditions before bulk purchase.
| Target Brand | Target MPN | Replace Type | Notes |
|---|---|---|---|
| ON Semiconductor | 2N3904 | General Purpose Alternative | NPN BJT, similar voltage and current ratings, check package compatibility. |
| Fairchild Semiconductor | BC547 | Cross Reference | NPN BJT, widely used general purpose transistor, verify hFE range. |
| STMicroelectronics | MPS2222A | Compatible Alternative | NPN BJT, similar electrical characteristics, confirm package type. |
| Texas Instruments | PN2222A | Possible Replacement | NPN BJT, check maximum collector current and voltage specifications. |
Datasheet
Download the datasheet or contact us for additional technical information.
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Typical Applications
- High-voltage NPN switching circuits
- Voltage level-shifting circuits
- High-voltage signal amplification
- Discrete high-voltage control stages
- Low-current interface circuits
- Compact surface-mount high-voltage designs
Ordering & RFQ Information
- MOQ: Contact sales
- Lead Time: 3–7 working days for stock items
- Packaging: Reel / Tube / Tray depending on package
- Sample Availability: Available on request
- Mass Production Status: 50K+ pcs Stock / Mass Production
FAQ
Can this part replace my current model?
It may be suitable depending on your circuit requirements. Please verify datasheet, package, pinout, and test samples before bulk orders.
Can I request samples?
Yes. Please submit your RFQ with target quantity and application details.
Need this part or a compatible replacement?
Send us your target part number, BOM list, quantity, and technical requirements. CNCHIPDEPOT can help review replacement options and provide RFQ support.
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SMT Assembly Workshop
SMT production and assembly capabilities supporting electronic component and PCB-related manufacturing requirements.
Semiconductor Production
Controlled production environments supporting semiconductor and electronic component manufacturing processes.
Component Testing Equipment
Electrical testing and verification equipment used to support performance checks and product consistency.
Quality Inspection Lab
Quality inspection processes help verify component condition, specifications and production consistency before shipment.