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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

onsemi MMBT6428-SB10220

Name: MMBT6428-SB10220
Brand: onsemi
SKU: MMBT6428-SB10220
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MMBT6428-SB10220

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: MMBT6428-SB10220.pdf

Description:: MMBT6428 - Small Signal Bipolar

Quantity:: RFQ Add To RFQ list

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Inventory:12,000

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Product details

Overview

MMBT6428-SB10220 from ON Semiconductor (formerly Fairchild) is an NPN general-purpose amplifier transistor in SOT-23 package, rated for 50 V V_CEO, 500 mA I_C, and 100–700 MHz f_T, used in low-power signal amplification stages of consumer audio preamps and sensor interface circuits.

For engineers reviewing the MMBT6428-SB10220 datasheet, pinout, applications, or equivalent options, key selection criteria include DC current gain consistency across 10 µA–10 mA I_C, low V_CE(sat) at 10 mA/0.5 mA drive, and thermal resistance of 357 °C/W on FR-4 PCB.

Technical Context

This NPN bipolar junction transistor operates in linear amplification mode with guaranteed h_FE ≥ 250 at I_C = 10 µA to 10 mA and V_CE = 5 V. Its f_T spans 100–700 MHz under standard bias, supporting RF front-end and broadband analog signal conditioning up to ~200 MHz.

Thermal design relies on R_θJA = 357 °C/W (FR-4, 1.6" × 1.6" × 0.06") and P_D = 350 mW at T_A = 25 °C, derating 2.8 mW/°C above ambient. C_obo = 3.0 pF and C_ibo = 8.0 pF enable stable high-frequency biasing without parasitic oscillation.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	50 V - Maximum safe collector-emitter voltage before breakdown in common-emitter configuration
I_C (continuous)	500 mA - Continuous collector current handling capacity without thermal runaway on standard PCB
f_T	100–700 MHz - Unity-gain bandwidth range confirming suitability for VHF amplification and oscillator bias networks
h_FE	250–650 - DC current gain stable across four decades of collector current (10 µA to 10 mA)
V_CE(sat)	0.2–0.6 V - Low saturation voltage enabling efficient switching or Class-A amplifier operation with minimal power loss
R_θJA	357 °C/W - Junction-to-ambient thermal resistance defining maximum allowable power dissipation at elevated ambient temperatures

Pinout & Package

SOT-23 plastic surface-mount package with 3-pin configuration: 1. Base, 2. Emitter, 3. Collector; marked "1K" on top surface; footprint compatible with JEDEC MO-215 standard.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Current-controlled input terminal	Accepts base drive current to modulate collector current; requires series resistor for bias stability in fixed-gain configurations
2 (Emitter)	Common reference node in CE/CC configurations	Connected to ground or emitter degeneration resistor; sets DC operating point and AC impedance matching
3 (Collector)	Output current terminal	Delivers amplified current to load; must be decoupled with bypass capacitor when used in RF amplifier stages

Key Features

Feature	Design Value
High f_T bandwidth	Supports stable small-signal amplification up to 200 MHz without external neutralization
Low V_CE(sat)	Enables <100 mV output swing headroom in low-voltage Class-A amplifier designs
Wide h_FE consistency	Maintains predictable gain across 10 µA–10 mA I_C, simplifying bias network design
Low output capacitance	C_obo = 3.0 pF minimizes Miller effect in common-emitter gain stages

Applications

Audio Pre-amplifier Stage	Sensor Signal Conditioning
Use Scenario: Amplifying weak microphone or piezoelectric sensor outputs in portable audio recorders. IC Role / Device Role / Timing Role: NPN small-signal amplifier in common-emitter configuration with emitter degeneration. Use Value: 250–650 h_FE ensures consistent voltage gain across production units; low V_CE(sat) preserves dynamic range in 3.3 V supply systems.	Use Scenario: Boosting low-level thermistor or photodiode signals prior to ADC sampling. IC Role / Device Role / Timing Role: Transimpedance or voltage amplifier in precision analog front-end. Use Value: 3.0 pF C_obo limits phase shift in feedback loops; 100–700 MHz f_T supports fast transient response to step inputs.
RF Local Oscillator Buffer	Low-Power Switching Load Driver
Use Scenario: Isolating and driving 10–50 MHz crystal oscillator outputs into mixer LO ports. IC Role / Device Role / Timing Role: Common-collector buffer stage providing current gain without voltage inversion. Use Value: 8.0 pF C_ibo enables stable input matching; 500 mA I_C rating accommodates peak drive currents during modulation.	Use Scenario: Driving LED indicators or small relays in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Saturated switch controlling load current via base-current-limited conduction. Use Value: 0.2 V V_CE(sat) at 10 mA/0.5 mA reduces power loss by >60% vs. typical 0.7 V BJT switches.

Audio Pre-amplifier Stage

Sensor Signal Conditioning

Use Scenario: Amplifying weak microphone or piezoelectric sensor outputs in portable audio recorders.

IC Role / Device Role / Timing Role: NPN small-signal amplifier in common-emitter configuration with emitter degeneration.

Use Value: 250–650 h_FE ensures consistent voltage gain across production units; low V_CE(sat) preserves dynamic range in 3.3 V supply systems.

Use Scenario: Boosting low-level thermistor or photodiode signals prior to ADC sampling.

IC Role / Device Role / Timing Role: Transimpedance or voltage amplifier in precision analog front-end.

Use Value: 3.0 pF C_obo limits phase shift in feedback loops; 100–700 MHz f_T supports fast transient response to step inputs.

RF Local Oscillator Buffer

Low-Power Switching Load Driver

Use Scenario: Isolating and driving 10–50 MHz crystal oscillator outputs into mixer LO ports.

IC Role / Device Role / Timing Role: Common-collector buffer stage providing current gain without voltage inversion.

Use Value: 8.0 pF C_ibo enables stable input matching; 500 mA I_C rating accommodates peak drive currents during modulation.

Use Scenario: Driving LED indicators or small relays in battery-powered IoT nodes.

IC Role / Device Role / Timing Role: Saturated switch controlling load current via base-current-limited conduction.

Use Value: 0.2 V V_CE(sat) at 10 mA/0.5 mA reduces power loss by >60% vs. typical 0.7 V BJT switches.

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
MMBT3904LT1G	V_CEO = 40 V (lower), h_FE min = 100 at I_C = 10 mA, f_T = 300 MHz typ	Lower voltage margin; less suitable for 30–50 V collector supply rails	Select when cost sensitivity outweighs need for 50 V rating and wide h_FE range
BC847BW	V_CEO = 45 V, h_FE = 200–450 at I_C = 10 mA, C_obo = 4.5 pF	Narrower h_FE spread and higher output capacitance reduce gain predictability in wide-bandwidth designs	Prefer for legacy European designs where BC847 family qualification is required

Compared with MMBT6428-SB10220, MMBT3904LT1G offers lower cost but sacrifices 10 V breakdown margin and h_FE consistency; BC847BW provides tighter process control but trades 1.5 pF higher C_obo and reduced f_T headroom for industrial-grade traceability.

Availability

MMBT6428-SB10220 is available at Aetrix Electronics and suitable for audio pre-amplifier stages, sensor signal conditioning circuits, RF local oscillator buffers, and low-power switching load drivers requiring stable component supply and consistent small-signal gain performance.

Supply support for MMBT6428-SB10220 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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and edge applications.

The MMBT6428-SB10220 belongs to ON Semiconductor's general-purpose bipolar transistor product line, engineered for reliable, low-cost amplification and switching in space-constrained consumer and industrial electronics.

FAQ

What is the maximum continuous collector current rating for MMBT6428-SB10220?

The MMBT6428-SB10220 has a maximum continuous collector current rating of 500 mA at T_A = 25 °C. This rating assumes proper PCB thermal relief per JEDEC standards; actual usable current decreases with rising ambient temperature due to its 2.8 mW/°C derating factor and 357 °C/W R_θJA.

Does MMBT6428-SB10220 support RF applications up to what frequency?

Yes, the MMBT6428-SB10220 supports RF applications up to approximately 200 MHz in practical amplifier designs. Its f_T specification ranges from 100 MHz to 700 MHz depending on bias conditions, and its low C_obo (3.0 pF) and C_ibo (8.0 pF) values help maintain stability in tuned RF stages using the MMBT6428-SB10220.

What is the pin configuration of MMBT6428-SB10220 in the SOT-23 package?

The MMBT6428-SB10220 uses standard SOT-23 pinout: Pin 1 is Base, Pin 2 is Emitter, and Pin 3 is Collector. The device is marked "1K" on its top surface, and this pin assignment is validated in Fairchild's original Rev. A datasheet and confirmed by ON Semiconductor's cross-reference documentation for the MMBT6428-SB10220.

How does the DC current gain (h_FE) of MMBT6428-SB10220 vary with collector current?

The MMBT6428-SB10220 maintains h_FE ≥ 250 across four decades of collector current - from 10 µA to 10 mA - at V_CE = 5 V. At I_C = 1.0 mA, h_FE reaches up to 650, enabling precise biasing in low-noise amplifier topologies where gain stability over signal amplitude is critical for the MMBT6428-SB10220.

Is MMBT6428-SB10220 suitable for use in battery-powered devices?

Yes, the MMBT6428-SB10220 is well-suited for battery-powered devices due to its low V_CE(sat) (0.2 V at I_C = 10 mA), low leakage (ICEO ≤ 0.1 µA), and SOT-23 footprint minimizing board area. Its 350 mW power dissipation limit and thermal characteristics allow efficient operation from 1.8 V to 5 V supplies without active cooling in the MMBT6428-SB10220.

MMBT6428-SB10220 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: -

Voltage - Collector Emitter Breakdown (Max):: -

Vce Saturation (Max) @ Ib, Ic:: 600mV @ 5mA, 100mA

Current - Collector Cutoff (Max):: 10nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 250 @ 100µA, 5V

Power - Max:: -

Frequency - Transition:: 700MHz

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

MMBT6428-SB10220 FAQ

1.How can I place an order for MMBT6428-SB10220 through Aetrix?

Please submit a Request for Quotation (RFQ) for MMBT6428-SB10220 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 MMBT6428-SB10220 reliable?

The price and inventory of MMBT6428-SB10220 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBT6428-SB10220 is usually 5 days.

3.What payment methods are accepted for MMBT6428-SB10220?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBT6428-SB10220 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMBT6428-SB10220?

MMBT6428-SB10220 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMBT6428-SB10220 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 MMBT6428-SB10220?

For technical support, including MMBT6428-SB10220 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBT6428-SB10220 requirements.

6.How does Aetrix verify that MMBT6428-SB10220 is sourced from the original manufacturer or authorized distributors?

All MMBT6428-SB10220 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 MMBT6428-SB10220 meets industry standards.

7.What is the process for return or replacement of MMBT6428-SB10220?

All MMBT6428-SB10220 units undergo pre-shipment inspection (PSI). If there is an issue with MMBT6428-SB10220, 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 MMBT6428-SB10220 part is unused and in its original packaging.

Return procedure for MMBT6428-SB10220:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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