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

onsemi MPS6724

Name: MPS6724
Brand: onsemi
SKU: MPS6724
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MPS6724

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: MPS6724.pdf

Description:: TRANS NPN DARL 40V 1A TO92

Quantity:: RFQ Add To RFQ list

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Inventory:2,480

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Product details

Overview

MPS6724 from onsemi is an NPN silicon Darlington transistor in TO-92 package, rated for 40 V_CEO, 1 A continuous collector current, and 1.0 W dissipation at T_A = 25°C. It delivers high DC current gain (h_FE = 25,000–40,000 at I_C = 200 mA), low V_CE(sat) ≤ 1.5 V, and operates across −55°C to +150°C junction temperature - used in relay drivers, lamp dimmers, and low-speed switching power stages.

For engineers reviewing the MPS6724 datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, thermal limits, safe operating area boundaries, TO-92 terminal mapping, and validated alternative transistors for industrial control and discrete amplifier designs.

Technical Context

The MPS6724 is a monolithic NPN Darlington pair with integrated base-emitter resistor network absent - requiring external base drive. Its high h_FE enables microampere-level base current control of 1 A loads, while f_T ≥ 100 MHz supports moderate-frequency switching up to ~10 kHz without significant gain roll-off.

Thermal design relies on R_JA = 125°C/W (ambient) and R_JC = 50°C/W (case), with second breakdown limiting active-region operation under pulsed conditions. Safe operating area (SOA) curves define maximum I_C-V_CE combinations at 1 ms, 1 s, and DC duty cycles ≤ 10%.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	40 V - Maximum collector-emitter voltage before avalanche breakdown; sets upper rail limit in switch-mode or linear regulator output stages.
I_C (continuous)	1000 mA - Sustained load current capability; defines drive capacity for solenoids, small motors, or LED arrays without derating.
P_D @ T_A = 25°C	1.0 W - Power dissipation limit with no heatsink; requires PCB copper area or forced air if ambient exceeds 25°C.
h_FE	25,000–40,000 - High current amplification factor enabling direct MCU GPIO drive without pre-amplifier stage.
V_CE(sat)	≤ 1.5 V @ I_C/I_B = 1000 - Low saturation voltage minimizes conduction loss and heat generation in high-duty-cycle switches.
f_T	100–1000 MHz - Transition frequency range confirming usable bandwidth for audio-frequency amplification and PWM dimming above 20 kHz.

Pinout & Package

Package: TO-92 (Case 29-10, Style 1), through-hole, Pb-free compliant, 1 W power rating.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Emitter terminal of Darlington pair	Reference node for base drive; connects to ground or low-side return path in common-emitter configuration.
2 (Base)	Input control terminal	Receives current-limited drive signal; base resistance must be selected to ensure I_B ≥ I_C/h_FE(min) for full saturation.
3 (Collector)	High-current output terminal	Switches load between supply rail and emitter; requires flyback diode when driving inductive loads.

Key Features

Feature	Design Value
High h_FE Darlington architecture	Enables single-stage current gain sufficient to drive 1 A loads from <100 µA base current - eliminates need for cascaded BJT stages.
Low V_CE(sat)	Reduces power loss to ≤1.5 W at full load, improving thermal margin in compact enclosures and reducing heatsink requirements.
Wide T_J range (−55°C to +150°C)	Supports deployment in automotive engine compartments, industrial motor controls, and outdoor lighting without derating.
TO-92 mechanical compatibility	Ensures drop-in replacement for legacy MPS6724 variants and cross-compatible NPN Darlington transistors in existing through-hole PCB layouts.

Applications

Relay Driver Circuit	Lamp Dimmer Module
Use Scenario: Driving 12 V/500 mA electromagnetic relay coil in PLC I/O modules. IC Role / Device Role / Timing Role: NPN Darlington switch providing galvanic isolation between microcontroller GPIO and relay coil. Use Value: High h_FE allows direct 3.3 V MCU output drive with series resistor; V_CE(sat) ≤ 1.5 V ensures >10.5 V across coil for reliable pull-in.	Use Scenario: Phase-controlled AC dimming of incandescent lamps in residential lighting controllers. IC Role / Device Role / Timing Role: Low-frequency switching element in TRIAC gate driver stage, triggered by zero-crossing detector. Use Value: 1 A rating handles peak gate currents up to 800 mA; SOA curve validates 10 ms pulse handling during leading-edge firing.
Motor Speed Controller	Industrial Sensor Interface
Use Scenario: PWM-based speed regulation of 24 V DC brushed motors in HVAC actuators. IC Role / Device Role / Timing Role: Low-side switch modulating motor current at 1–5 kHz carrier frequency. Use Value: f_T ≥ 100 MHz ensures minimal phase lag at 5 kHz; thermal resistance R_JA = 125°C/W permits 500 mA continuous operation on 1 oz copper.	Use Scenario: Amplifying low-level analog signals from strain gauges or thermopiles in factory floor instrumentation. IC Role / Device Role / Timing Role: Discrete emitter-follower buffer stage isolating sensor output from ADC input impedance. Use Value: High input impedance (due to Darlington β) prevents loading of high-Z sensors; V_BE(on) ≤ 2.0 V ensures stable bias point over temperature.

Relay Driver Circuit

Lamp Dimmer Module

Use Scenario: Driving 12 V/500 mA electromagnetic relay coil in PLC I/O modules.

IC Role / Device Role / Timing Role: NPN Darlington switch providing galvanic isolation between microcontroller GPIO and relay coil.

Use Value: High h_FE allows direct 3.3 V MCU output drive with series resistor; V_CE(sat) ≤ 1.5 V ensures >10.5 V across coil for reliable pull-in.

Use Scenario: Phase-controlled AC dimming of incandescent lamps in residential lighting controllers.

IC Role / Device Role / Timing Role: Low-frequency switching element in TRIAC gate driver stage, triggered by zero-crossing detector.

Use Value: 1 A rating handles peak gate currents up to 800 mA; SOA curve validates 10 ms pulse handling during leading-edge firing.

Motor Speed Controller

Industrial Sensor Interface

Use Scenario: PWM-based speed regulation of 24 V DC brushed motors in HVAC actuators.

IC Role / Device Role / Timing Role: Low-side switch modulating motor current at 1–5 kHz carrier frequency.

Use Value: f_T ≥ 100 MHz ensures minimal phase lag at 5 kHz; thermal resistance R_JA = 125°C/W permits 500 mA continuous operation on 1 oz copper.

Use Scenario: Amplifying low-level analog signals from strain gauges or thermopiles in factory floor instrumentation.

IC Role / Device Role / Timing Role: Discrete emitter-follower buffer stage isolating sensor output from ADC input impedance.

Use Value: High input impedance (due to Darlington β) prevents loading of high-Z sensors; V_BE(on) ≤ 2.0 V ensures stable bias point over temperature.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBT6427	V_CEO = 30 V, h_FE = 10,000–25,000, P_D = 350 mW (SOT-23)	Lower voltage/current rating; surface-mount only; unsuitable for 40 V or 1 A loads.	Select only for space-constrained, low-power (<300 mA) applications where TO-92 footprint is unavailable.
PN2222A	Single NPN, V_CEO = 40 V, h_FE = 100–300, I_C = 800 mA, P_D = 625 mW	Lower gain requires base pre-driver; higher V_CE(sat) (~0.3 V) but lower switching speed.	Prefer when fast turn-off or minimal storage time is critical; avoid where high gain or low drive current is required.

Compared with MMBT6427 and PN2222A, the MPS6724 uniquely combines TO-92 packaging, 1 A current capability, and Darlington-level h_FE - making it irreplaceable in cost-sensitive, through-hole, high-gain switching applications where layout cannot accommodate SMT or multi-stage drive.

Availability

MPS6724 is available at Aetrix Electronics and suitable for relay drivers, lamp dimmers, motor speed controllers, and industrial sensor interfaces requiring stable component supply and long-term obsolescence management.

Supply support for MPS6724 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, and cloud infrastructure markets.

The MPS6724 belongs to onsemi's legacy discrete bipolar transistor product line, engineered for robust, low-cost, high-gain switching in industrial control, appliance, and power interface circuits.

FAQ

What is the maximum continuous collector current for the MPS6724?

The MPS6724 supports a maximum continuous collector current of 1000 mA at T_A = 25°C. Derating is required above 25°C at 8.0 mW/°C, meaning usable current drops to approximately 600 mA at 75°C ambient. This rating assumes proper PCB copper area and no additional heatsinking.

Does the MPS6724 have an integrated base-emitter resistor?

No, the MPS6724 does not include internal base-emitter resistors. It is a standard two-terminal Darlington transistor requiring external base current limiting. Designers must calculate R_B based on V_CC, V_BE(on) ≤ 2.0 V, and target I_B ≥ I_C/h_FE(min) = 1000 mA / 25,000 = 40 µA.

What is the safe operating area (SOA) limitation for pulsed operation of the MPS6724?

The MPS6724 SOA curve (Figure 1) defines maximum I_C-V_CE combinations: at 1 ms pulse width, it supports up to 3 A at 10 V; at 100 ms, ≤1.2 A at 20 V. Operation beyond these boundaries risks second breakdown. Duty cycle must remain ≤10% for sustained pulsed use.

Can the MPS6724 replace the MPS6725 in a 40 V circuit?

Yes, the MPS6724 can replace the MPS6725 in circuits operating ≤40 V, as its V_CEO = 40 V matches the lower limit of the MPS6725 (50 V). However, the MPS6725 offers higher voltage margin and slightly higher h_FE at high current; substitution is valid only if 40 V is the absolute maximum system voltage.

Is the MPS6724RLRAG variant RoHS-compliant and halogen-free?

Yes, the MPS6724RLRAG carries the "G" suffix indicating Pb-free (RoHS-compliant) construction per onsemi's specification. The device meets JESD204B and IPC-1752 standards for hazardous substance restrictions, with halogen content below 900 ppm chlorine and 900 ppm bromine thresholds.

MPS6724 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 - Darlington

Current - Collector (Ic) (Max):: 1 A

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

Vce Saturation (Max) @ Ib, Ic:: 1.5V @ 2mA, 1A

Current - Collector Cutoff (Max):: 100nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 4000 @ 1A, 5V

Power - Max:: 1 W

Frequency - Transition:: 1GHz

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

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

MPS6724 FAQ

1.How can I place an order for MPS6724 through Aetrix?

Please submit a Request for Quotation (RFQ) for MPS6724 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 MPS6724 reliable?

The price and inventory of MPS6724 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPS6724 is usually 5 days.

3.What payment methods are accepted for MPS6724?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPS6724 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MPS6724?

MPS6724 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MPS6724 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 MPS6724?

For technical support, including MPS6724 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPS6724 requirements.

6.How does Aetrix verify that MPS6724 is sourced from the original manufacturer or authorized distributors?

All MPS6724 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 MPS6724 meets industry standards.

7.What is the process for return or replacement of MPS6724?

All MPS6724 units undergo pre-shipment inspection (PSI). If there is an issue with MPS6724, 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 MPS6724 part is unused and in its original packaging.

Return procedure for MPS6724:

1.Submit a request within 90 days.

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

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