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

onsemi MMBT2222ALT1

Name: MMBT2222ALT1
Brand: onsemi
SKU: MMBT2222ALT1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MMBT2222ALT1

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: MMBT2222ALT1.pdf

Description:: TRANS NPN 40V 0.6A SOT23-3

Quantity:: RFQ Add To RFQ list

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Inventory:2,750

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Product details

Overview

MMBT2222ALT1 from onsemi is an NPN silicon general-purpose transistor in SOT-23 package, rated for 40 V_CEO, 600 mA continuous collector current, and 300 MHz f_T, commonly used in low-power switching and amplification circuits in consumer and industrial control systems.

For engineers reviewing the MMBT2222ALT1 datasheet, pinout, applications, or equivalent options, key selection criteria include V_CEO/V_CBO ratings, h_FE consistency across temperature, saturation voltage at 150 mA/15 mA drive, thermal resistance on FR-5 board, and Pb-free RoHS-compliant packaging.

Technical Context

This device operates as a discrete bipolar junction transistor with fixed NPN polarity, optimized for linear amplification and digital switching. Its DC current gain (h_FE) ranges from 100 to 300 at I_C = 10 mA and V_CE = 10 V, with guaranteed minimum h_FE ≥ 75 at I_C = 1.0 mA and ≥ 35 at I_C = 0.1 mA.

Switching performance is characterized by t_d ≤ 10 ns, t_r ≤ 25 ns, t_s ≤ 225 ns, and t_f ≤ 60 ns under specified test conditions (V_CC = 30 V, I_C = 150 mA, I_B1 = I_B2 = 15 mA). Small-signal parameters include C_obo ≤ 8.0 pF and f_T = 300 MHz at I_C = 20 mA, V_CE = 20 V.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	40 V - Maximum safe collector-emitter voltage before breakdown; enables use in 24 V logic-level and sensor interface circuits.
I_C Continuous	600 mA - Sustained load-driving capability without thermal derating at 25°C ambient on FR-5 board.
h_FE @ 10 mA	100–300 - Predictable DC gain range supports stable bias design in amplifier stages and saturated switch configurations.
V_CE(sat) @ 150 mA	≤ 0.3 V - Low saturation voltage minimizes power loss and self-heating in high-duty-cycle switching applications.
f_T	300 MHz - Supports RF pre-amplifier and high-speed digital signal conditioning up to ~100 MHz practical bandwidth.
R_JA (FR-5)	556 °C/W - Thermal resistance defines maximum allowable power dissipation (225 mW at 25°C) before junction exceeds 150°C.
Pb-Free / RoHS	Compliant - Meets environmental compliance requirements for global commercial and industrial PCB assembly.

Pinout & Package

SOT-23 (TO-236) surface-mount package, 2.90 × 1.30 × 1.00 mm, 3-pin configuration with gull-wing leads. Moisture sensitivity level (MSL) 1 per JEDEC J-STD-020.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Current-controlled input node; requires series resistor to limit I_B and ensure reliable saturation or linear operation.
2	Emitter	Common reference terminal; tied to ground or low-side return path in most switching topologies.
3	Collector	Output current sink node; connects to load (e.g., relay coil, LED, logic gate input) and supply rail via pull-up.

Key Features

Feature	Design Value
AEC-Q101 Qualified	Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for under-hood and infotainment subsystems.
V_CBO = 75 V	Higher collector-base withstand voltage improves noise immunity and transient tolerance in inductive load switching (e.g., solenoids, small motors).
V_EBO = 6.0 V	Extended emitter-base reverse rating allows safe operation with negative base drive or AC-coupled inputs without clamping diodes.
Low C_obo ≤ 8.0 pF	Minimizes Miller effect in high-frequency amplifiers, preserving gain stability and reducing phase shift in feedback networks.
h_FE min = 75 @ −55°C	Guaranteed gain retention at extreme cold enables reliable operation in outdoor, aerospace, and industrial environments.

Applications

LED Driver Circuit	Microcontroller GPIO Expander
Use Scenario: Driving 20–100 mA indicator LEDs from 3.3 V or 5 V MCU outputs. IC Role / Device Role / Timing Role: NPN switch operating in saturation mode, translating logic-level signals into higher-current loads. Use Value: V_CE(sat) ≤ 0.3 V ensures <100 mW dissipation at 100 mA, eliminating need for heatsinking on standard PCBs.	Use Scenario: Level-shifting and current boosting for legacy 5 V peripherals connected to modern 3.3 V microcontrollers. IC Role / Device Role / Timing Role: Active-low buffer with inverted output; provides >10× current gain to drive TTL-compatible inputs. Use Value: h_FE ≥ 100 at I_C = 10 mA guarantees robust turn-on margin even with marginal base drive from weak GPIO pins.
DC Motor Control (Small)	Sensor Signal Amplifier
Use Scenario: PWM-controlled bidirectional drive of 12 V, <500 mA brushed DC motors in robotics and actuation modules. IC Role / Device Role / Timing Role: Low-side switch in half-H-bridge configuration; handles repetitive 20 kHz PWM with minimal switching loss. Use Value: t_s ≤ 225 ns and t_f ≤ 60 ns enable clean edge transitions, reducing electromagnetic interference and MOSFET gate driver stress.	Use Scenario: Amplifying low-level analog signals from thermistors, photodiodes, or bridge sensors in measurement front-ends. IC Role / Device Role / Timing Role: Common-emitter small-signal amplifier with fixed bias; configured for mid-band voltage gain and impedance matching. Use Value: f_T = 300 MHz and h_fe ≥ 300 at 10 mA support stable 20–50× gain up to 10 MHz without peaking or instability.

LED Driver Circuit

Microcontroller GPIO Expander

Use Scenario: Driving 20–100 mA indicator LEDs from 3.3 V or 5 V MCU outputs.

IC Role / Device Role / Timing Role: NPN switch operating in saturation mode, translating logic-level signals into higher-current loads.

Use Value: V_CE(sat) ≤ 0.3 V ensures <100 mW dissipation at 100 mA, eliminating need for heatsinking on standard PCBs.

Use Scenario: Level-shifting and current boosting for legacy 5 V peripherals connected to modern 3.3 V microcontrollers.

IC Role / Device Role / Timing Role: Active-low buffer with inverted output; provides >10× current gain to drive TTL-compatible inputs.

Use Value: h_FE ≥ 100 at I_C = 10 mA guarantees robust turn-on margin even with marginal base drive from weak GPIO pins.

DC Motor Control (Small)

Sensor Signal Amplifier

Use Scenario: PWM-controlled bidirectional drive of 12 V, <500 mA brushed DC motors in robotics and actuation modules.

IC Role / Device Role / Timing Role: Low-side switch in half-H-bridge configuration; handles repetitive 20 kHz PWM with minimal switching loss.

Use Value: t_s ≤ 225 ns and t_f ≤ 60 ns enable clean edge transitions, reducing electromagnetic interference and MOSFET gate driver stress.

Use Scenario: Amplifying low-level analog signals from thermistors, photodiodes, or bridge sensors in measurement front-ends.

IC Role / Device Role / Timing Role: Common-emitter small-signal amplifier with fixed bias; configured for mid-band voltage gain and impedance matching.

Use Value: f_T = 300 MHz and h_fe ≥ 300 at 10 mA support stable 20–50× gain up to 10 MHz without peaking or instability.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN general-purpose transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
PN2222A (ON Semiconductor)	TO-92 through-hole package; identical electrical specs but larger footprint and higher R_JA (~200 °C/W).	Preferred where manual prototyping, breadboarding, or legacy through-hole assembly is required.	Select PN2222A when board space is unconstrained and hand-soldering or socket-based testing is needed.
BC847BW (Nexperia)	SOT-323 package; V_CEO = 45 V, h_FE = 200–450 at 10 mA, lower C_ibo = 15 pF vs. 25 pF for MMBT2222ALT1.	Better suited for high-density RF bias networks and ultra-low-capacitance signal paths.	Choose BC847BW when minimizing parasitic capacitance and maximizing layout density outweighs legacy design compatibility.

Compared with PN2222A and BC847BW, the MMBT2222ALT1 delivers optimal balance of proven reliability, AEC-Q101 qualification, SOT-23 manufacturability, and consistent h_FE across temperature - making it the preferred choice for volume production of industrial control and automotive body electronics where long-term supply continuity matters.

Availability

MMBT2222ALT1 is available at Aetrix Electronics and suitable for LED drivers, microcontroller interface circuits, small DC motor control, and sensor signal amplification requiring stable component supply, full traceability, and long-term lifecycle support.

Supply support for MMBT2222ALT1 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The MMBT2222ALT1 belongs to onsemi's General Purpose Transistor product line, designed to deliver robust, cost-effective, and environmentally compliant discrete switching and amplification in high-volume surface-mount applications.

FAQ

What is the maximum junction temperature rating for the MMBT2222ALT1?

The MMBT2222ALT1 has a junction and storage temperature range of −55°C to +150°C. This allows operation in harsh environments such as automotive engine compartments or industrial enclosures without derating, provided PCB thermal design maintains T_J ≤ 150°C under worst-case power dissipation.

Is the MMBT2222ALT1 pin-compatible with the older MMBT2222LT1?

No - while both share the SOT-23 package and NPN topology, the MMBT2222ALT1 has higher V_CEO (40 V vs. 30 V), V_CBO (75 V vs. 60 V), and guaranteed h_FE minimums. Pinout is identical (Base–Emitter–Collector), but direct substitution requires verification of voltage margin and gain stability in the target circuit.

Does the MMBT2222ALT1 support automotive applications?

Yes - the MMBT2222ALT1 is AEC-Q101 qualified and PPAP capable, with validated performance across −40°C to +125°C ambient. It is approved for use in non-safety-critical automotive subsystems including lighting controls, HVAC actuators, and body electronics.

What is the typical noise figure of the MMBT2222ALT1 at 1 kHz?

The MMBT2222ALT1 has a maximum noise figure of 4.0 dB at I_C = 100 µA, V_CE = 10 V, R_S = 1.0 kΩ, and f = 1.0 kHz. This makes it suitable for low-noise preamplifier stages in sensor interfaces where signal integrity is critical.

Can the MMBT2222ALT1 be used in linear amplifier configurations?

Yes - the MMBT2222ALT1 supports linear operation with h_fe ≥ 300 at I_C = 10 mA and f = 1 kHz, and exhibits predictable V_BE(on) behavior across temperature. Its f_T of 300 MHz enables stable mid-band voltage amplification up to ~10 MHz with proper biasing and compensation.

MMBT2222ALT1 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Cut Tape (CT)

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 600 mA

Voltage - Collector Emitter Breakdown (Max):: 40 V

Vce Saturation (Max) @ Ib, Ic:: 1V @ 50mA, 500mA

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 150mA, 10V

Power - Max:: 225 mW

Frequency - Transition:: 300MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3 (TO-236)

MMBT2222ALT1 FAQ

1.How can I place an order for MMBT2222ALT1 through Aetrix?

Please submit a Request for Quotation (RFQ) for MMBT2222ALT1 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 MMBT2222ALT1 reliable?

The price and inventory of MMBT2222ALT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBT2222ALT1 is usually 5 days.

3.What payment methods are accepted for MMBT2222ALT1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBT2222ALT1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMBT2222ALT1?

MMBT2222ALT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMBT2222ALT1 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 MMBT2222ALT1?

For technical support, including MMBT2222ALT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBT2222ALT1 requirements.

6.How does Aetrix verify that MMBT2222ALT1 is sourced from the original manufacturer or authorized distributors?

All MMBT2222ALT1 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 MMBT2222ALT1 meets industry standards.

7.What is the process for return or replacement of MMBT2222ALT1?

All MMBT2222ALT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMBT2222ALT1, 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 MMBT2222ALT1 part is unused and in its original packaging.

Return procedure for MMBT2222ALT1:

1.Submit a request within 90 days.

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

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