CNCHIPDEPOT Original Part
MMBTA44
MMBTA44 high-voltage NPN BJT transistor with 400V VCEO, 300mA collector current, 250mW power and SOT-23 package.
Transistor PolarityNPN
Collector-Emitter Voltage (VCEO)400 V
Collector Current (IC)300 mA
DC Current Gain (hFE)50 Min @ IC = 10 mA, VCE = 10 V
Power Dissipation (PD)250 mW
PackageSOT-23
Product Overview
The MMBTA44 is an NPN bipolar junction transistor designed for high-voltage switching, driver, and signal amplification applications. It features a 400V collector-emitter voltage rating, 300mA maximum collector current, and a minimum DC current gain of 50 at 10mA collector current. Its high breakdown voltage makes it suitable for discrete control and amplifier circuits that operate at substantially higher voltages than standard small-signal transistors.
Packaged in a compact SOT-23 surface-mount package, the MMBTA44 is suitable for voltage level shifting, high-voltage signal switching, interface circuits, and low-current control stages where PCB space is limited.
Specifications
Key electrical, package, and sourcing parameters for quick engineering review.
| Part Number | MMBTA44 |
| Brand | CNCHIPDEPOT |
| Package | SOT-23 |
| Product Type | BJT |
| Transistor Polarity | NPN |
| Collector-Emitter Voltage (VCEO) | 400 V |
| Collector Current (IC) | 300 mA |
| DC Current Gain (hFE) | 50 Min @ IC = 10 mA, VCE = 10 V |
| Power Dissipation (PD) | 250 mW |
| Collector-Emitter Saturation Voltage (VCE(sat)) | 0.75 V Max @ IC = 50 mA, IB = 5 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 |
|---|---|---|---|
| NXP Semiconductors | BC847B | Functional Replacement | Similar NPN BJT characteristics; confirm voltage and current ratings. |
| Fairchild Semiconductor | MMBTA44 | Direct Replacement | Same MPN from original manufacturer. |
| ON Semiconductor | MMBTA44 | Cross Reference | Verify electrical parameters match. |
| STMicroelectronics | MMBTA44 | Compatible Alternative | Check package and pin configuration. |
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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As a China electronic component factory , China Chip Depot supports component sourcing, production, testing and quality inspection for global B2B buyers. We also provide Cross Reference Alternative Parts matching services to help engineers and procurement teams identify suitable component alternatives.
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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.