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

onsemi MPS3646RLRA

Name: MPS3646RLRA
Brand: onsemi
SKU: MPS3646RLRA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: MPS3646RLRA

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: MPS3646RLRA.pdf

Description:: TRANS NPN 15V 0.3A TO92

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,114

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

Product details

Overview

MPS3646RLRA from onsemi is an NPN silicon switching transistor in TO-92 (CASE 29−11) 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 current control.

For engineers reviewing the MPS3646RLRA datasheet, pinout, applications, or equivalent options, key selection criteria include verified saturation voltage at high drive current, thermal resistance (R_θJC = 83.3 °C/W), junction temperature range (−55 to +150 °C), and Pb-free TO-92 compatibility for industrial PCB assembly.

Technical Context

This device operates as a general-purpose NPN bipolar junction transistor optimized for fast-switching applications, featuring t_on ≤ 18 ns and t_off ≤ 28 ns under V_CC = 10 V, I_C = 300 mA conditions. Its h_FE ranges from 15 to 120 depending on I_C and V_CE, supporting both linear amplification and saturated switching modes.

Designed for ambient- and case-cooled operation, it delivers 625 mW at T_A = 25 °C (derated 5.0 mW/°C above), or 1.5 W at T_C = 25 °C (derated 12 mW/°C above), with R_θJA = 200 °C/W confirming suitability for non-heatsinked low-power discrete switching roles.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	15 Vdc - maximum safe collector-emitter voltage under open-base condition; defines upper rail limit in low-side switch designs.
I_C (continuous)	300 mAdc - sustained collector current capability without thermal runaway at T_A = 25 °C with proper PCB copper area.
V_CE(sat)	≤ 0.5 V at I_C = 300 mA / I_B = 30 mA - ensures <150 mW conduction loss in saturated switching, critical for efficiency in battery-powered loads.
f_T	350 MHz - usable bandwidth for RF pre-driver or high-speed digital switching up to ~35 MHz square waves with controlled edge integrity.
R_θJC	83.3 °C/W - enables direct thermal path to heatsink or metal-core PCB pad, supporting 1.5 W dissipation when case temperature is actively managed.
t_off	≤ 28 ns - supports PWM frequencies up to 10 MHz in hard-switched topologies where turn-off delay dominates timing budget.

Pinout & Package

Package: TO-92 (CASE 29−11, STYLE 1), Pb-free, through-hole mounting. Dimensions per ON Semiconductor drawing ISSUE AD: body height 4.44–5.21 mm, lead pitch 2.54 mm, lead diameter 0.457–0.533 mm.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Connected to ground or low-side return path; base drive referenced to this node for standard common-emitter configuration.
2 (Base)	Control input	Receives current-limited drive (e.g., via 1 kΩ resistor from MCU GPIO); requires ≥30 mA for full saturation at 300 mA collector load.
3 (Collector)	Current source terminal	Switches positive supply to load (e.g., LED anode or relay coil); must be routed with adequate trace width for 300 mA continuous current.

Key Features

Feature	Design Value
Fast switching speed	t_on/t_off ≤ 18/28 ns enables clean 10 MHz PWM control without excessive shoot-through risk in half-bridge gate drivers.
Low V_CE(sat)	0.2–0.5 V across full I_C range reduces conduction loss by >40% vs. legacy general-purpose transistors like 2N3904 at 300 mA.
High f_T	350 MHz gain-bandwidth supports stable small-signal amplification up to 50 MHz or broadband RF buffer use in IF stages.
Extended temperature range	Junction rating −55 to +150 °C allows deployment in automotive engine-bay sensors or industrial motor-control feedback circuits.

Applications

LED Constant-Current Driver	Low-Voltage DC-DC Converter Switch
Use Scenario: Driving high-brightness LEDs from 5 V or 12 V rails with analog dimming via base current modulation. IC Role / Device Role / Timing Role: NPN switch controlling LED cathode current path; operates in saturation during ON phase and cutoff during OFF phase. Use Value: V_CE(sat) ≤ 0.5 V minimizes power loss in series-pass configuration, enabling >92% efficiency at 300 mA LED current.	Use Scenario: Synchronous rectifier or main switch in 5 V-input buck converter delivering up to 250 mA output. IC Role / Device Role / Timing Role: Low-side switching element driven by PWM controller; handles repetitive 1–5 MHz switching with minimal dead-time penalty. Use Value: t_off ≤ 28 ns and low C_obo (≤5 pF) reduce switching losses and EMI generation compared to slower alternatives.
Microcontroller GPIO Expander	Industrial Sensor Interface Stage
Use Scenario: Amplifying weak MCU GPIO outputs (e.g., 3.3 V / 20 mA) to drive 12 V solenoids or relays requiring 100–300 mA. IC Role / Device Role / Timing Role: Digital interface buffer providing current gain and voltage level translation between logic and actuator domains. Use Value: h_FE ≥ 30 at I_C = 30 mA ensures reliable saturation with standard 1 kΩ base resistor from 3.3 V MCU pins.	Use Scenario: Isolating and conditioning analog sensor signals (e.g., thermistor or RTD bridge outputs) before ADC input in PLC modules. IC Role / Device Role / Timing Role: Active load or emitter-follower buffer stage improving signal source impedance matching and noise immunity. Use Value: f_T = 350 MHz and low input capacitance (C_ibo ≤ 9 pF) preserve signal integrity up to 100 kHz without phase lag or attenuation.

LED Constant-Current Driver

Low-Voltage DC-DC Converter Switch

Use Scenario: Driving high-brightness LEDs from 5 V or 12 V rails with analog dimming via base current modulation.

IC Role / Device Role / Timing Role: NPN switch controlling LED cathode current path; operates in saturation during ON phase and cutoff during OFF phase.

Use Value: V_CE(sat) ≤ 0.5 V minimizes power loss in series-pass configuration, enabling >92% efficiency at 300 mA LED current.

Use Scenario: Synchronous rectifier or main switch in 5 V-input buck converter delivering up to 250 mA output.

IC Role / Device Role / Timing Role: Low-side switching element driven by PWM controller; handles repetitive 1–5 MHz switching with minimal dead-time penalty.

Use Value: t_off ≤ 28 ns and low C_obo (≤5 pF) reduce switching losses and EMI generation compared to slower alternatives.

Microcontroller GPIO Expander

Industrial Sensor Interface Stage

Use Scenario: Amplifying weak MCU GPIO outputs (e.g., 3.3 V / 20 mA) to drive 12 V solenoids or relays requiring 100–300 mA.

IC Role / Device Role / Timing Role: Digital interface buffer providing current gain and voltage level translation between logic and actuator domains.

Use Value: h_FE ≥ 30 at I_C = 30 mA ensures reliable saturation with standard 1 kΩ base resistor from 3.3 V MCU pins.

Use Scenario: Isolating and conditioning analog sensor signals (e.g., thermistor or RTD bridge outputs) before ADC input in PLC modules.

IC Role / Device Role / Timing Role: Active load or emitter-follower buffer stage improving signal source impedance matching and noise immunity.

Use Value: f_T = 350 MHz and low input capacitance (C_ibo ≤ 9 pF) preserve signal integrity up to 100 kHz without phase lag or attenuation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor MPS3640RLRA	V_CEO = 40 V, I_C = 200 mA, V_CE(sat) ≤ 0.3 V @ 100 mA - higher breakdown but lower current rating.	Better suited for 24 V industrial I/O modules where overvoltage margin is critical, but not recommended for 300 mA loads.	Select MPS3640RLRA only if system rail exceeds 15 V and peak current stays below 200 mA.
Diodes Incorporated DXT3646-13	Same TO-92 package, V_CEO = 15 V, I_C = 300 mA, but f_T = 250 MHz and t_off = 35 ns - slower switching and lower bandwidth.	Acceptable for <500 kHz switching or static load switching where speed is secondary to cost.	Choose DXT3646-13 only when design does not require sub-30 ns turn-off or >300 MHz small-signal gain.

Compared with MPS3646RLRA, MPS3640RLRA trades current capacity for higher voltage tolerance, while DXT3646-13 sacrifices speed and RF performance for broader distributor availability - MPS3646RLRA remains optimal for 15 V, 300 mA, high-speed switching where thermal and timing margins are tight.

Availability

MPS3646RLRA is available at Aetrix Electronics and suitable for LED driver circuits, low-voltage DC-DC converters, and microcontroller interface expansion requiring stable component supply, RoHS-compliant packaging, and consistent parametric performance across production batches.

Supply support for MPS3646RLRA 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, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The MPS3646RLRA belongs to onsemi's general-purpose bipolar transistor product line, engineered for robustness and consistency in discrete switching and amplification roles across harsh-environment applications.

FAQ

What is the maximum continuous collector current rating for MPS3646RLRA?

The MPS3646RLRA is rated for 300 mAdc continuous collector current at T_A = 25 °C with appropriate PCB copper area for heat dissipation. At elevated ambient temperatures, derating applies at 5.0 mW/°C above 25 °C, limiting usable current in enclosed or high-temperature environments unless case temperature is actively managed.

Does MPS3646RLRA support Pb-free soldering processes?

Yes, MPS3646RLRA is manufactured in a Pb-free TO-92 package compliant with JEDEC J-STD-020 moisture sensitivity level (MSL) requirements and qualified for standard reflow profiles including peak temperatures up to 260 °C, making it suitable for modern lead-free PCB assembly lines.

What is the typical DC current gain (h_FE) of MPS3646RLRA at 300 mA collector current?

At I_C = 300 mA and V_CE = 1.0 Vdc, the MPS3646RLRA exhibits h_FE ≥ 15 (minimum) per datasheet specifications. This value reflects guaranteed minimum gain under saturation conditions and confirms sufficient base drive margin for reliable switching into moderate loads.

Can MPS3646RLRA be used in RF amplifier applications?

Yes, the MPS3646RLRA has an f_T of 350 MHz and low capacitance (C_obo ≤ 5 pF, C_ibo ≤ 9 pF), supporting stable small-signal amplification up to approximately 50 MHz. It is appropriate for IF amplifiers, RF detector buffers, or low-power transmitter driver stages where gain and bandwidth outweigh noise figure requirements.

How does the thermal resistance of MPS3646RLRA affect its power handling capability?

With R_θJC = 83.3 °C/W and R_θJA = 200 °C/W, the MPS3646RLRA can dissipate 1.5 W when mounted to a heatsink or metal-core PCB (T_C = 25 °C), but only 625 mW in still-air ambient (T_A = 25 °C). Effective thermal design directly determines whether the device operates within safe junction limits under sustained load.

MPS3646RLRA Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tape & Reel (TR)

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)

MPS3646RLRA FAQ

1.How can I place an order for MPS3646RLRA through Aetrix?

Please submit a Request for Quotation (RFQ) for MPS3646RLRA 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 MPS3646RLRA reliable?

The price and inventory of MPS3646RLRA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPS3646RLRA is usually 5 days.

3.What payment methods are accepted for MPS3646RLRA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPS3646RLRA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MPS3646RLRA?

MPS3646RLRA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MPS3646RLRA 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 MPS3646RLRA?

For technical support, including MPS3646RLRA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPS3646RLRA requirements.

6.How does Aetrix verify that MPS3646RLRA is sourced from the original manufacturer or authorized distributors?

All MPS3646RLRA 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 MPS3646RLRA meets industry standards.

7.What is the process for return or replacement of MPS3646RLRA?

All MPS3646RLRA units undergo pre-shipment inspection (PSI). If there is an issue with MPS3646RLRA, 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 MPS3646RLRA part is unused and in its original packaging.

Return procedure for MPS3646RLRA:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 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…

2026-09-02 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…