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onsemi MMBTA05
- Part No.:
- MMBTA05
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBTA05.pdf
- Description:
- TRANS NPN 60V 0.5A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,354
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Product details
Overview
MMBTA05 from ON Semiconductor is an NPN general-purpose amplifier transistor in SOT-23 package, rated for 60 V VCEO, 500 mA IC, and 350 mW PD, optimized for low-to-medium current amplification up to 300 mA in signal conditioning and switching circuits.
For engineers reviewing the MMBTA05 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, validated SOT-23 terminal mapping, real-world use cases in discrete gain stages and interface drivers, and two confirmed alternative transistors with documented parameter differences.
Technical Context
The MMBTA05 operates as a silicon NPN bipolar junction transistor with DC current gain (hFE) ≥100 at both 10 mA and 100 mA collector current, supporting linear amplification and saturated switching. Its fT of 100 MHz enables RF-capable small-signal operation up to VHF bands under specified bias conditions.
Designed for general-purpose use-not automotive or safety-critical applications-the device features 4.0 V VEBO, 0.25 V VCE(sat) at IC = 100 mA / IB = 10 mA, and thermal resistance RθJA = 357 °C/W on FR-4 PCB, defining its power handling and thermal design envelope.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 60 V - Maximum safe collector-emitter voltage before breakdown; sets upper rail limit in amplifier or switch designs. |
| IC | 500 mA - Continuous collector current rating; supports drive capability for relays, LEDs, and small solenoids. |
| PD | 350 mW - Max power dissipation in SOT-23 package; constrains usable IC×VCE product at ambient temperature. |
| hFE | ≥100 @ IC = 10 mA & 100 mA - Stable current gain across two decades of current; simplifies bias network design. |
| fT | 100 MHz - Unity-gain bandwidth; validates suitability for audio preamps and low-VHF signal amplification. |
| VBE(on) | 1.2 V @ IC = 100 mA - Base-emitter turn-on voltage; determines required base drive level in saturated switch mode. |
Pinout & Package
SOT-23 3-lead plastic surface-mount package (JEDEC TO-236AB), marked "1H", with gull-wing leads and 0.95 mm lead pitch. Thermal performance defined per FR-4 PCB mounting per datasheet Figure 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control terminal; requires ~1.2 V forward bias and sufficient IB to achieve target IC with hFE ≥100. |
| 2 | Emitter | Current return path; tied to ground or low-impedance reference in common-emitter configurations. |
| 3 | Collector | Output terminal; connects to load or next stage; must remain ≤60 V relative to emitter under all operating conditions. |
Key Features
| Feature | Design Value |
|---|---|
| General-purpose NPN architecture | Validated for amplification and switching up to 300 mA-reduces need for multiple transistor families in BOMs. |
| High hFE consistency | Guaranteed ≥100 at both 10 mA and 100 mA-enables single-bias design across wide dynamic range. |
| Low VCE(sat) | 0.25 V max at IC/IB = 100 mA/10 mA-minimizes conduction loss and self-heating in switching applications. |
| SOT-23 footprint | Standardized 3-pin surface-mount package compatible with automated assembly and space-constrained layouts. |
Applications
| Audio Pre-amplifier Stage | Microcontroller GPIO Driver |
|---|---|
Use Scenario: Amplifying weak line-level or sensor signals prior to ADC sampling in portable audio devices. IC Role / Device Role / Timing Role: Discrete NPN gain stage configured in common-emitter topology with fixed bias or emitter degeneration. Use Value: 100 MHz fT and stable hFE ensure flat frequency response up to 20 kHz with minimal distortion at low supply currents. |
Use Scenario: Driving LEDs, small relays, or MOSFET gates from 3.3 V or 5 V microcontroller outputs. IC Role / Device Role / Timing Role: Low-side switch with base driven directly from MCU I/O pin through current-limiting resistor. Use Value: 0.25 V VCE(sat) minimizes voltage drop and power loss, enabling efficient on-state control without external driver ICs. |
| DC Power Supply Error Amplifier | Industrial Sensor Interface |
Use Scenario: Implementing error correction in linear regulator feedback loops where op-amp output drive is insufficient. IC Role / Device Role / Timing Role: NPN emitter-follower or common-collector buffer amplifying op-amp output to drive pass transistor base. Use Value: 60 V VCEO and 500 mA IC allow direct integration into 24 V industrial supply rails without additional level-shifting. |
Use Scenario: Converting analog sensor outputs (e.g., thermistor, photodiode) into digital-ready logic levels for PLC input modules. IC Role / Device Role / Timing Role: Discrete comparator front-end or current-to-voltage converter stage with hysteresis via base feedback. Use Value: 4.0 V VEBO and 0.1 μA ICEO support reliable operation with high-impedance sensor sources and noise-immune threshold detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN general-purpose amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC846B | hFE = 200–450 (vs. MMBTA05's 100 min); VCEO = 65 V; PD = 310 mW; same SOT-23 package. | Higher gain enables lower base drive current but reduced power margin; suitable where precision biasing is prioritized over drive strength. | Select BC846B when tighter hFE tolerance and higher small-signal gain are needed, accepting 40 mW lower dissipation. |
| PN2222A | TO-92 package (not SOT-23); VCEO = 40 V (vs. 60 V); PD = 1 W (bulk); hFE = 100 min at 150 mA only. | Through-hole mounting and lower voltage rating restrict use in compact, high-rail, or automated production environments. | Choose PN2222A only for prototyping or legacy through-hole designs where board space and 60 V operation are not constraints. |
Compared with BC846B and PN2222A, the MMBTA05 offers balanced trade-offs: guaranteed 60 V breakdown and 350 mW SOT-23 power handling with consistent hFE across 10–100 mA-making it optimal for production-grade surface-mount amplifiers and switches requiring reliability and layout efficiency.
Availability
MMBTA05 is available at Aetrix Electronics and suitable for audio pre-amplifiers, microcontroller GPIO drivers, DC power supply error amplifiers, and industrial sensor interfaces requiring stable component supply, consistent parametric performance, and SOT-23 manufacturability.
Supply support for MMBTA05 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
ON Semiconductor (formerly Fairchild Semiconductor) is a global semiconductor supplier specializing in power management, analog, sensors, and discrete devices for industrial, automotive, and consumer markets.
The MMBTA05 belongs to ON Semiconductor's general-purpose bipolar transistor product line, engineered for cost-effective, reliable amplification and switching in non-safety-critical commercial electronics.
FAQ
What is the maximum collector-emitter voltage rating for the MMBTA05?
The MMBTA05 has a VCEO rating of 60 V, meaning it can safely sustain up to 60 volts between collector and emitter with base open. This rating is confirmed in the Absolute Maximum Ratings table of the official ON Semiconductor datasheet Rev. 1.3 and defines the upper voltage limit for circuit design using the MMBTA05 in amplifier or switching roles.
Is the MMBTA05 suitable for switching applications?
Yes, the MMBTA05 is suitable for switching applications due to its 0.25 V VCE(sat) at IC = 100 mA and IB = 10 mA, low leakage (0.1 μA ICEO), and fast fT of 100 MHz. These parameters enable clean saturation and rapid turn-off in low-power digital interface and load-driving circuits using the MMBTA05.
What package type does the MMBTA05 use?
The MMBTA05 uses the SOT-23 (JEDEC TO-236AB) surface-mount package with three gull-wing leads, marked "1H". Its dimensions, land pattern, and thermal characteristics-including RθJA = 357 °C/W-are fully specified in the Physical Dimensions section of the MMBTA05 datasheet Rev. 1.3.
How does the MMBTA05 compare to the MPSA05?
The MMBTA05 and MPSA05 share identical electrical specifications (VCEO, hFE, fT, etc.) but differ in package: MMBTA05 is SOT-23, while MPSA05 is TO-92. The MMBTA05 offers surface-mount compatibility and higher thermal resistance, whereas MPSA05 provides higher power dissipation (625 mW) and through-hole mounting-both are valid variants of the same NPN amplifier family.
What is the DC current gain (hFE) of the MMBTA05 at 100 mA collector current?
The MMBTA05 guarantees hFE ≥100 at IC = 100 mA and VCE = 1.0 V, as stated in the Electrical Characteristics table of the official datasheet. This minimum gain holds across the full operating temperature range and ensures predictable biasing in medium-current amplifier and switch designs using the MMBTA05.
MMBTA05 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 500 mA
- Voltage - Collector Emitter Breakdown (Max):
- 60 V
- Vce Saturation (Max) @ Ib, Ic:
- 250mV @ 10mA, 100mA
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 100mA, 1V
- Power - Max:
- 350 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MMBTA05 FAQ
1.How can I place an order for MMBTA05 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBTA05 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 MMBTA05 reliable?
The price and inventory of MMBTA05 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBTA05 is usually 5 days.
3.What payment methods are accepted for MMBTA05?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBTA05 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBTA05?
MMBTA05 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBTA05 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 MMBTA05?
For technical support, including MMBTA05 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBTA05 requirements.
6.How does Aetrix verify that MMBTA05 is sourced from the original manufacturer or authorized distributors?
All MMBTA05 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 MMBTA05 meets industry standards.
7.What is the process for return or replacement of MMBTA05?
All MMBTA05 units undergo pre-shipment inspection (PSI). If there is an issue with MMBTA05, 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 MMBTA05 part is unused and in its original packaging.
Return procedure for MMBTA05:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBTA05 Tags
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