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

onsemi MPS3646G

Name: MPS3646G
Brand: onsemi
SKU: MPS3646G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MPS3646G

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 Long Body

Datasheet:: MPS3646G.pdf

Description:: TRANS NPN 15V 0.3A TO92

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MPS3646G from onsemi is an NPN silicon switching transistor in TO-92 package, rated for V_CEO = 15 V, I_C = 300 mA continuous, and f_T = 350 MHz, with V_CE(sat) ≤ 0.5 V at I_C = 300 mA / I_B = 30 mA - used in low-voltage DC-DC converter switch stages and LED driver saturation switches.

For engineers reviewing the MPS3646G datasheet, pinout, applications, or equivalent options, key selection criteria include verified V_CEO(sus) = 15 V rating, guaranteed h_FE ≥ 15 at 300 mA, thermal resistance R_JA = 200 °C/W, and TO-92 lead-form compatibility for through-hole power switching designs.

Technical Context

This device operates as a general-purpose NPN bipolar junction transistor optimized for fast-switching applications. It features a minimum current gain (h_FE) of 15 at I_C = 300 mA and V_CE = 1.0 V, with V_CE(sat) ≤ 0.5 V under same conditions - enabling efficient low-loss saturation in digital logic interface and load switching circuits.

Its dynamic performance includes t_on ≤ 18 ns, t_off ≤ 28 ns, and f_T = 350 MHz at I_C = 30 mA / V_CE = 10 V, supported by C_obo ≤ 5.0 pF and C_ibo ≤ 9.0 pF - confirming suitability for medium-frequency switching up to ~100 MHz in discrete amplifier and pulse generator stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO(sus)	15 Vdc - Sustains 15 V collector-emitter voltage under switching off-state with zero base drive, defining maximum supply rail compatibility.
I_C Continuous	300 mAdc - Supports sustained 300 mA load current without thermal derating at T_A = 25°C, suitable for small-signal relay drivers.
V_CE(sat)	≤ 0.5 V at I_C = 300 mA / I_B = 30 mA - Ensures < 150 mW conduction loss in saturated switch mode, critical for efficiency in battery-powered loads.
f_T	350 MHz - Enables stable amplification or switching up to ~100 MHz fundamental frequency, validated at I_C = 30 mA / V_CE = 10 V.
R_JA	200 °C/W - Limits junction temperature rise to 62.5°C above ambient at full 625 mW dissipation, requiring minimal heatsinking in PCB layouts.
h_FE	15–120 - Minimum DC current gain of 15 at high-current switching point (300 mA), ensuring reliable base drive margin in digital interface designs.

Pinout & Package

Package: TO-92 (Case 29−11, Style 1), through-hole, Pb-free compliant, with 3.43 mm radius contour and standardized lead spacing per ANSI Y14.5M.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Current return path; connected to ground or low-side reference in common-emitter switch configurations.
2	Base	Control input; requires ≥30 mA drive for full saturation at 300 mA collector current.
3	Collector	High-side load connection; handles up to 15 V and 300 mA with V_CE(sat) ≤ 0.5 V when properly biased.

Key Features

Feature	Design Value
Fast switching speed	t_on ≤ 18 ns / t_off ≤ 28 ns enables >5 MHz square-wave operation in discrete gate drivers and PWM modulators.
Guaranteed high-current gain	h_FE ≥ 15 at I_C = 300 mA ensures predictable base drive requirements without overdesigning driver circuitry.
Low saturation voltage	V_CE(sat) ≤ 0.5 V at rated current minimizes power loss and self-heating in compact, unheatsinked PCB layouts.
Pb-free TO-92 package	RoHS-compliant leadframe and molding compound meet industrial and consumer regulatory requirements without derating.

Applications

LED Driver Switch	Microcontroller Interface
Use Scenario: Driving 20–100 mA indicator LEDs from 3.3 V or 5 V microcontroller GPIO pins. IC Role / Device Role / Timing Role: NPN switch operating in saturation mode, translating logic-level signals into higher-current LED paths. Use Value: V_CE(sat) ≤ 0.3 V at 30 mA ensures >95% LED forward voltage utilization and minimal GPIO loading.	Use Scenario: Level-shifting and signal inversion between 3.3 V MCU outputs and 5 V/12 V peripheral control lines. IC Role / Device Role / Timing Role: Digital inverter and voltage translator using common-emitter configuration with pull-up resistor. Use Value: t_on/t_off < 30 ns supports clean 10+ MHz toggle rates without signal distortion or shoot-through risk.
DC-DC Converter Switch	Relay Driver Stage
Use Scenario: Low-side switch in non-synchronous buck converter topologies powering sensors or actuators at ≤15 V input. IC Role / Device Role / Timing Role: Power switch controlling energy transfer from input to output inductor during ON phase. Use Value: f_T = 350 MHz and low C_obo ≤ 5 pF reduce switching losses and EMI generation at 500 kHz–1 MHz operating frequencies.	Use Scenario: Driving 12 V, 40–70 mA coil relays from embedded controller outputs in industrial I/O modules. IC Role / Device Role / Timing Role: High-gain saturated switch providing isolation and current amplification between logic and inductive load. Use Value: h_FE ≥ 25 at 100 mA guarantees robust turn-on with ≤4 mA base drive, reducing MCU pin stress and enabling multiplexed control.

LED Driver Switch

Microcontroller Interface

Use Scenario: Driving 20–100 mA indicator LEDs from 3.3 V or 5 V microcontroller GPIO pins.

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

Use Value: V_CE(sat) ≤ 0.3 V at 30 mA ensures >95% LED forward voltage utilization and minimal GPIO loading.

Use Scenario: Level-shifting and signal inversion between 3.3 V MCU outputs and 5 V/12 V peripheral control lines.

IC Role / Device Role / Timing Role: Digital inverter and voltage translator using common-emitter configuration with pull-up resistor.

Use Value: t_on/t_off < 30 ns supports clean 10+ MHz toggle rates without signal distortion or shoot-through risk.

DC-DC Converter Switch

Relay Driver Stage

Use Scenario: Low-side switch in non-synchronous buck converter topologies powering sensors or actuators at ≤15 V input.

IC Role / Device Role / Timing Role: Power switch controlling energy transfer from input to output inductor during ON phase.

Use Value: f_T = 350 MHz and low C_obo ≤ 5 pF reduce switching losses and EMI generation at 500 kHz–1 MHz operating frequencies.

Use Scenario: Driving 12 V, 40–70 mA coil relays from embedded controller outputs in industrial I/O modules.

IC Role / Device Role / Timing Role: High-gain saturated switch providing isolation and current amplification between logic and inductive load.

Use Value: h_FE ≥ 25 at 100 mA guarantees robust turn-on with ≤4 mA base drive, reducing MCU pin stress and enabling multiplexed control.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN switching transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBT3904LT1G	V_CEO = 40 V, I_C = 200 mA, f_T = 300 MHz, SOT-23 package	Higher voltage rating but lower current capability and surface-mount only	Select when board space is constrained and 40 V standoff is required; not drop-in for TO-92 footprint.
BC547C	V_CEO = 45 V, I_C = 100 mA, h_FE = 420 (typ), TO-92 package	Higher gain but lower current and slower switching (t_off ≈ 250 ns)	Prefer for linear amplification or low-speed switching where gain >200 is needed; unsuitable for 300 mA loads.

Compared with MMBT3904LT1G and BC547C, the MPS3646G uniquely balances 300 mA current handling, 15 V sustainable voltage, and sub-30 ns switching in a standard TO-92 through-hole package - making it optimal for cost-sensitive, medium-power discrete switching where leaded assembly and thermal margin are priorities.

Availability

MPS3646G is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller interface stages, and low-voltage DC-DC converter switches requiring stable component supply and long-term manufacturability.

Supply support for MPS3646G 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, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT applications.

The MPS3646G belongs to onsemi's legacy general-purpose bipolar transistor product line, designed specifically for reliable, low-cost discrete switching in consumer, industrial, and computing power management subsystems.

FAQ

What is the maximum continuous collector current rating for MPS3646G?

The MPS3646G is rated for 300 mAdc continuous collector current at T_A = 25°C, with thermal derating of 5.0 mW/°C above that temperature. This rating is confirmed in the Absolute Maximum Ratings table and validated under DC bias conditions with no pulse duty cycle limitation - making it suitable for steady-state load switching applications such as LED arrays and relay coils.

Does MPS3646G support 5 V logic-level drive for full saturation?

Yes, the MPS3646G achieves full saturation with V_CE(sat) ≤ 0.5 V at I_C = 300 mA when driven with I_B = 30 mA, which corresponds to a typical base-emitter voltage V_BE(sat) of 0.95–1.2 V. A 5 V logic source with a 130 Ω series resistor delivers ~30 mA base current, satisfying the requirement without additional level-shifting circuitry.

Is MPS3646G RoHS-compliant and halogen-free?

Yes, the MPS3646G is manufactured in a Pb-free package (TO-92, Case 29−11) and complies with RoHS Directive 2011/65/EU. The device uses halogen-free molding compound and leadframe plating, as confirmed in onsemi's packaging documentation and material declarations - supporting compliance in consumer and industrial end products.

What is the storage temperature range for MPS3646G?

The MPS3646G has a specified storage temperature range of −55°C to +150°C, matching its operating junction temperature limits. This wide range allows safe long-term storage in uncontrolled environments and supports use in automotive under-hood or industrial outdoor enclosures where ambient extremes are expected.

Can MPS3646G replace MPS2222A in existing designs?

The MPS3646G is not a direct replacement for MPS2222A due to differences in V_CEO (15 V vs. 40 V) and h_FE profile - MPS3646G guarantees h_FE ≥ 15 at 300 mA, while MPS2222A specifies h_FE ≥ 35 at 150 mA. Substitution is only viable in circuits where 15 V maximum supply and lower gain at high current are acceptable and verified.

MPS3646G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-226-3, TO-92-3 Long Body

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 300 mA

Voltage - Collector Emitter Breakdown (Max):: 15 V

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 30mA, 300mA

Current - Collector Cutoff (Max):: 500nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 30 @ 30mA, 400mV

Power - Max:: 625 mW

Frequency - Transition:: 350MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92 (TO-226)

MPS3646G FAQ

1.How can I place an order for MPS3646G through Aetrix?

Please submit a Request for Quotation (RFQ) for MPS3646G 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 MPS3646G reliable?

The price and inventory of MPS3646G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPS3646G is usually 5 days.

3.What payment methods are accepted for MPS3646G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPS3646G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MPS3646G?

MPS3646G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MPS3646G 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 MPS3646G?

For technical support, including MPS3646G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPS3646G requirements.

6.How does Aetrix verify that MPS3646G is sourced from the original manufacturer or authorized distributors?

All MPS3646G 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 MPS3646G meets industry standards.

7.What is the process for return or replacement of MPS3646G?

All MPS3646G units undergo pre-shipment inspection (PSI). If there is an issue with MPS3646G, 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 MPS3646G part is unused and in its original packaging.

Return procedure for MPS3646G:

1.Submit a request within 90 days.

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

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