Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Diodes Incorporated MMBT2222A-7

Name: MMBT2222A-7
Brand: Diodes Incorporated
SKU: MMBT2222A-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: MMBT2222A-7

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

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

Datasheet:: MMBT2222A-7.pdf

Description:: TRANS NPN 40V 0.6A SOT-23-3

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:8,136

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

MMBT2222A-7 from Diodes Incorporated is an NPN small-signal surface-mount transistor with V_CEO = 40 V, I_C = 600 mA, P_D = 300 mW, f_T = 300 MHz, and h_FE = 35–300 (depending on bias), used for medium-power amplification and switching in compact PCB designs.

For engineers reviewing the MMBT2222A-7 datasheet, MMBT2222A-7 pinout, MMBT2222A-7 application, or MMBT2222A-7 equivalent, key selection factors include its SOT-23 package thermal resistance (R_JA = 417 °C/W), V_CE(SAT) performance at 150 mA/15 mA drive, and complementary pairing with MMBT2907A for push-pull stages.

Technical Context

This NPN bipolar junction transistor uses epitaxial planar die construction for stable gain and low leakage across -55°C to +150°C operation. Its DC current gain spans 35–300 depending on collector current (100 µA to 500 mA) and V_CE, enabling flexible biasing in linear and saturated switching modes.

With f_T = 300 MHz at V_CE = 20 V and I_C = 20 mA, it supports RF amplification up to ~100 MHz in low-noise configurations (NF = 4.0 dB at 1 kHz). Switching times-td = 10 ns, tr = 25 ns, ts = 225 ns, tf = 60 ns-are specified under standardized 30 V / 150 mA conditions with defined base drive.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	40 V - Maximum safe collector-emitter voltage before breakdown under open-base condition.
I_C (cont.)	600 mA - Continuous collector current rating at T_A = 25°C with FR-4 PCB mounting per AP02001 layout.
P_D	300 mW - Power dissipation limit at 25°C ambient; derates to zero at 150°C per R_JA = 417 °C/W curve.
f_T	300 MHz - Unity-gain frequency confirming usable bandwidth for VHF amplification and fast digital switching.
h_FE	35–300 - DC current gain range across 100 µA–500 mA I_C, critical for setting bias stability in amplifier and switch designs.
V_CE(SAT)	0.3–1.0 V - Saturation voltage at I_C/I_B = 150 mA/15 mA and 500 mA/50 mA, directly impacting conduction loss in switching applications.
NF	4.0 dB - Noise figure at 1 kHz, 100 µA I_C, 1 kΩ source resistance, relevant for low-level analog preamplifiers.

Pinout & Package

Package: SOT-23 (JEDEC TO-236AB), surface-mount plastic case rated UL 94V-0, 0.008 g weight, lead-free plating available (-F suffix).

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Connected to ground or low-impedance return path; defines reference for V_BE and I_C control.
2 (Base)	Control input	Receives forward-biased current to modulate collector current; requires external current-limiting resistor in most applications.
3 (Collector)	Current source terminal	Delivers amplified output current; connected to load or next stage; must respect V_CEO and power limits.

Key Features

Feature	Design Value
Complementary PNP pair	MMBT2907A shares identical SOT-23 footprint and matched thermal characteristics for balanced differential circuits.
High f_T / low C_obo	300 MHz f_T with only 8 pF output capacitance enables clean signal amplification up to VHF band without excessive loading.
Wide temperature range	Rated for operation from -55°C to +150°C, supporting industrial, automotive under-hood, and power supply feedback loop use.
Low leakage	I_CBO ≤ 10 nA at V_CB = 60 V ensures minimal off-state current in battery-powered or high-impedance sensing nodes.
Standardized marking	"K1P" top-side laser marking enables automated optical inspection and traceability in SMT assembly lines.

Applications

LED Driver Stage

Microcontroller GPIO Expander

Use Scenario: Driving 20–100 mA indicator or status LEDs from 3.3 V or 5 V logic rails.

IC Role / Device Role: NPN switch operating in saturation with I_B/I_C = 1/10 to ensure low V_CE(SAT) and minimal self-heating.

Use Value: Delivers consistent LED brightness with <0.4 V drop at 50 mA, reducing power loss versus higher-V_CE(SAT) alternatives.

Use Scenario: Level-shifting and current boosting for MCU pins driving relays, buzzers, or small solenoids.

IC Role / Device Role: Medium-current interface buffer between low-drive GPIO and inductive loads requiring >20 mA.

Use Value: Supports reliable turn-on with 15 mA base drive while maintaining <1.0 V saturation at 500 mA collector load.

Audio Preamp Input Stage

Power Supply Feedback Transistor

Use Scenario: Low-noise voltage amplification of microphone or sensor signals in portable audio devices.

IC Role / Device Role: Common-emitter small-signal amplifier biased at 100 µA–1 mA for optimal NF and h_FE linearity.

Use Value: Achieves 4.0 dB noise figure at 1 kHz with stable h_FE > 75, minimizing added noise in front-end gain stages.

Use Scenario: Isolating and amplifying error amplifier output in adjustable DC-DC converter feedback loops.

IC Role / Device Role: Linear-mode current mirror or level translator interfacing TL431 or op-amp outputs to optocoupler inputs.

Use Value: Maintains precise V_BE tracking (±20 mV over -40°C to +85°C) for stable regulation across temperature.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN small-signal transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
PN2222A (ON Semiconductor)	Same V_CEO, I_C, P_D; h_FE min = 100 @ I_C = 10 mA (vs. 35 for MMBT2222A-7); slightly higher R_JA (450 °C/W).	Better gain consistency at low currents; less suitable for high-temperature PCBs due to thermal resistance.	Select when tighter h_FE tolerance at 10 mA is required and board layout allows for marginally lower thermal performance.
BC847B (Nexperia)	V_CEO = 45 V, I_C = 100 mA, P_D = 300 mW; h_FE = 200–450 @ I_C = 10 mA; smaller SOT-23 variant with tighter gain binning.	Lower max I_C limits use to sub-100 mA loads; superior h_FE uniformity benefits precision biasing.	Prefer for low-current analog circuits where gain matching matters more than peak current capability.

Compared with PN2222A and BC847B, the MMBT2222A-7 offers the highest continuous collector current (600 mA) and widest operational temperature range (-55°C to +150°C), making it uniquely suited for thermally demanding switching and industrial feedback applications where robustness outweighs tight gain binning.

Availability

MMBT2222A-7 is available at Aetrix Electronics and suitable for LED driver stages, microcontroller GPIO expansion, audio preamplifier input stages, and power supply feedback circuits requiring stable component supply across extended temperature ranges.

Supply support for MMBT2222A-7 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The MMBT2222A-7 belongs to Diodes' broad portfolio of general-purpose small-signal transistors engineered for cost-sensitive, high-volume applications in consumer, industrial, and computing systems where reliability and standardization are critical.

FAQ

Is MMBT2222A-7 RoHS-compliant and lead-free?

Yes, MMBT2222A-7 is RoHS-compliant and available in lead-free version with matte tin finish. The standard part uses lead-free plating per J-STD-020A Level 1 moisture sensitivity, and the lead-free variant is designated by adding "-F" suffix (e.g., MMBT2222A-7-F).

What is the maximum allowable junction temperature for continuous operation?

The absolute maximum junction temperature is +150°C, and the device is rated for continuous operation across T_J = -55°C to +150°C. Derating begins above 25°C ambient per the R_JA = 417 °C/W curve in Figure 1, reaching zero power at 150°C ambient on standard FR-4 layout.

Can MMBT2222A-7 replace PN2222A in existing designs?

Yes, MMBT2222A-7 is a direct SOT-23 drop-in replacement for through-hole PN2222A in surface-mount layouts, sharing identical pinout (E-B-C), voltage/current ratings, and complementary pairing with MMBT2907A. Thermal performance differs slightly due to package geometry.

How does the h_FE variation affect bias stability in amplifier designs?

h_FE varies from 35 to 300 across I_C and temperature, so amplifier bias networks must use emitter degeneration or feedback to maintain Q-point stability. Designs relying on fixed base bias may experience significant gain drift or cutoff/saturation shift over temperature or unit-to-unit variation.

MMBT2222A-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

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):: 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:: 310 mW

Frequency - Transition:: 300MHz

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

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

MMBT2222A-7 FAQ

1.How can I place an order for MMBT2222A-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for MMBT2222A-7 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 MMBT2222A-7 reliable?

The price and inventory of MMBT2222A-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBT2222A-7 is usually 5 days.

3.What payment methods are accepted for MMBT2222A-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBT2222A-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMBT2222A-7?

MMBT2222A-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMBT2222A-7 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 MMBT2222A-7?

For technical support, including MMBT2222A-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBT2222A-7 requirements.

6.How does Aetrix verify that MMBT2222A-7 is sourced from the original manufacturer or authorized distributors?

All MMBT2222A-7 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 MMBT2222A-7 meets industry standards.

7.What is the process for return or replacement of MMBT2222A-7?

All MMBT2222A-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBT2222A-7, 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 MMBT2222A-7 part is unused and in its original packaging.

Return procedure for MMBT2222A-7:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…