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

onsemi MPS5172G

Name: MPS5172G
Brand: onsemi
SKU: MPS5172G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MPS5172G

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: MPS5172G.pdf

Description:: TRANS NPN 25V 0.1A TO92

Quantity:: RFQ Add To RFQ list

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Inventory:2,946

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Product details

Overview

MPS5172G from onsemi is an NPN general-purpose silicon transistor in TO-92 package, rated for 25 V_CEO, 100 mA continuous collector current, and 625 mW power dissipation at 25°C ambient. It delivers DC current gain (h_FE) of 100–500 at 10 mA/10 V, with V_CE(sat) ≤ 0.25 V and V_BE(on) between 0.5–1.25 V - suitable for low-voltage switching and amplification in consumer power supplies and signal conditioning circuits.

For engineers reviewing the MPS5172G datasheet, pinout, applications, or equivalent options, key selection criteria include verified V_CEO/I_C ratings, h_FE consistency across temperature, thermal resistance (R_JA = 200°C/W), Pb-free compliance, and TO-92 mechanical compatibility with legacy board layouts.

Technical Context

The MPS5172G operates as a discrete bipolar junction transistor with fixed NPN polarity, designed for linear amplification and saturated switching in low-power analog and digital interface stages. Its electrical behavior is defined by V_CEO = 25 V, I_C = 100 mA, and h_FE = 100–500 under standard test conditions (V_CE = 10 V, I_C = 10 mA).

Thermal performance is characterized by R_JA = 200°C/W and R_JC = 83.3°C/W, supporting operation from −55°C to +150°C junction temperature. The device exhibits C_cb = 1.6–10 pF at 10 V and f_T up to 500 MHz, confirming suitability for audio-frequency and low-speed digital switching applications.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	25 V - Maximum safe collector-emitter voltage before breakdown; defines upper rail limit in 24 V systems.
I_C (continuous)	100 mA - Sustained collector current capability; supports relay drivers and LED load switches.
h_FE	100–500 - DC current gain range at 10 mA/10 V; enables predictable base drive sizing for saturation.
V_CE(sat)	≤ 0.25 V @ I_C/I_B = 10 - Low saturation voltage minimizes conduction loss in switching mode.
R_JA	200°C/W - Junction-to-ambient thermal resistance; determines temperature rise under 625 mW dissipation.
T_J range	−55°C to +150°C - Validated operating junction temperature span; supports industrial and automotive under-hood use.

Pinout & Package

Package: TO-92 (Case 29, Style 1), Pb-free, through-hole mounting. Dimensions per ANSI Y14.5M: body height 4.45–5.20 mm, lead spacing 2.54 mm.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Current exit terminal; connects to ground or low-side return path in common-emitter configurations.
2	Base	Control input; requires ~1 mA drive for 10 mA collector saturation, enabling simple resistor biasing.
3	Collector	Current entry terminal; interfaces with positive supply rails up to 25 V in switching loads.

Key Features

Feature	Design Value
Pb-free TO-92 packaging	Fully compliant with RoHS Directive 2011/65/EU; eliminates lead contamination risk in assembly and recycling.
Wide h_FE range (100–500)	Enables robust design margin for base drive tolerance across production lots and temperature extremes.
Low V_CE(sat) (≤0.25 V)	Reduces power loss and self-heating during sustained on-state operation in 5–24 V logic-level switches.
High T_J(max) (150°C)	Supports reliable operation in enclosed enclosures or high-ambient environments without derating penalties.

Applications

LED Driver Circuits	Level-Shifting Interfaces
Use Scenario: Driving 20 mA indicator LEDs from 3.3 V or 5 V microcontroller GPIO pins. IC Role / Device Role / Timing Role: Discrete NPN switch providing current amplification and isolation between logic and load. Use Value: Enables direct GPIO control without external driver ICs; V_CE(sat) ≤ 0.25 V ensures >95% LED forward voltage utilization.	Use Scenario: Translating 3.3 V logic signals to 5 V or 12 V domains in mixed-voltage systems. IC Role / Device Role / Timing Role: Active pull-up switch converting open-drain or low-voltage outputs to higher-rail logic levels. Use Value: h_FE ≥ 100 guarantees stable switching with minimal base current; TO-92 footprint simplifies layout integration.
Relay Coil Drivers	Audio Pre-amplifier Stages
Use Scenario: Energizing 5–24 V DC relay coils requiring 20–80 mA holding current. IC Role / Device Role / Timing Role: Saturated switch controlling coil current path with flyback diode protection. Use Value: 25 V V_CEO safely handles inductive kickback; 100 mA I_C rating covers typical relay loads.	Use Scenario: Low-noise small-signal amplification in microphone preamps or sensor signal conditioning. IC Role / Device Role / Timing Role: Linear-mode amplifier stage with controlled gain and bandwidth. Use Value: f_T up to 500 MHz and h_fe = 100–750 support stable gain at audio frequencies with low distortion.

LED Driver Circuits

Level-Shifting Interfaces

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

IC Role / Device Role / Timing Role: Discrete NPN switch providing current amplification and isolation between logic and load.

Use Value: Enables direct GPIO control without external driver ICs; V_CE(sat) ≤ 0.25 V ensures >95% LED forward voltage utilization.

Use Scenario: Translating 3.3 V logic signals to 5 V or 12 V domains in mixed-voltage systems.

IC Role / Device Role / Timing Role: Active pull-up switch converting open-drain or low-voltage outputs to higher-rail logic levels.

Use Value: h_FE ≥ 100 guarantees stable switching with minimal base current; TO-92 footprint simplifies layout integration.

Relay Coil Drivers

Audio Pre-amplifier Stages

Use Scenario: Energizing 5–24 V DC relay coils requiring 20–80 mA holding current.

IC Role / Device Role / Timing Role: Saturated switch controlling coil current path with flyback diode protection.

Use Value: 25 V V_CEO safely handles inductive kickback; 100 mA I_C rating covers typical relay loads.

Use Scenario: Low-noise small-signal amplification in microphone preamps or sensor signal conditioning.

IC Role / Device Role / Timing Role: Linear-mode amplifier stage with controlled gain and bandwidth.

Use Value: f_T up to 500 MHz and h_fe = 100–750 support stable gain at audio frequencies with low distortion.

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
BC547B	Lower V_CEO (45 V), similar h_FE (200–450), same TO-92 package but non-Pb-free option available.	Higher voltage headroom but no guaranteed Pb-free variant; less suitable for RoHS-critical production.	Select BC547B only if Pb-free compliance is not required and 45 V rating adds design margin.
MPSA18	Higher V_CEO (45 V), higher h_FE (100–400), same TO-92, Pb-free version (MPSA18G) available.	Broader voltage range and identical environmental compliance; slightly higher cost and lower availability.	MPSA18G is a drop-in alternative where 45 V rating improves safety margin in 24 V systems.

Compared with MPS5172G, BC547B offers higher voltage rating but lacks guaranteed Pb-free status, while MPSA18G provides identical environmental compliance plus extended V_CEO - making it preferable for new designs requiring both RoHS and enhanced overvoltage resilience.

Availability

MPS5172G is available at Aetrix Electronics and suitable for LED driver circuits, level-shifting interfaces, and relay coil drivers requiring stable component supply, full RoHS compliance, and TO-92 mechanical compatibility.

Supply support for MPS5172G 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 MPS5172G belongs to onsemi's general-purpose bipolar transistor product line, engineered for cost-sensitive, high-volume applications demanding reliability, consistent gain, and Pb-free manufacturing readiness.

FAQ

What is the maximum collector-emitter voltage rating for the MPS5172G?

The MPS5172G has a maximum collector-emitter voltage (V_CEO) rating of 25 Vdc, tested at I_C = 10 mA with I_B = 0. This rating defines the absolute upper limit for safe operation in common-emitter configurations and must not be exceeded even transiently. Derating is recommended above 25°C ambient to maintain reliability.

Does the MPS5172G meet RoHS requirements?

Yes, the MPS5172G is explicitly designated as Pb-free in its ordering information and marking diagram, complying with EU RoHS Directive 2011/65/EU. The "G" suffix denotes Pb-free packaging, and the device uses lead-free soldering-compatible materials throughout its TO-92 construction.

What is the typical DC current gain (h_FE) of the MPS5172G at 10 mA collector current?

The MPS5172G exhibits a DC current gain (h_FE) ranging from 100 to 500 when measured at V_CE = 10 V and I_C = 10 mA. This wide gain band allows flexible base resistor selection and accommodates process variation while maintaining saturation in switching applications.

Can the MPS5172G be used in linear amplifier configurations?

Yes, the MPS5172G supports linear operation with small-signal current gain (h_fe) of 100–750 at 10 mA/10 V/1 kHz, and f_T up to 500 MHz. Its low noise and stable gain make it suitable for audio preamplifiers and sensor signal conditioning, provided thermal limits and SOA curves are observed.

What is the thermal resistance from junction to ambient (R_JA) for the MPS5172G in free-air conditions?

The MPS5172G has a specified thermal resistance from junction to ambient (R_JA) of 200°C/W under standard test conditions (TO-92, no heatsink, free-air convection). This value determines the temperature rise above ambient at a given power dissipation - e.g., 625 mW yields a 125°C rise - and must be validated in actual PCB layout.

MPS5172G 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):: 100 mA

Voltage - Collector Emitter Breakdown (Max):: 25 V

Vce Saturation (Max) @ Ib, Ic:: 250mV @ 1mA, 10mA

Current - Collector Cutoff (Max):: 100nA

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

Power - Max:: 625 mW

Frequency - Transition:: -

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

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

MPS5172G FAQ

1.How can I place an order for MPS5172G through Aetrix?

Please submit a Request for Quotation (RFQ) for MPS5172G 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 MPS5172G reliable?

The price and inventory of MPS5172G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPS5172G is usually 5 days.

3.What payment methods are accepted for MPS5172G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPS5172G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MPS5172G?

MPS5172G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MPS5172G 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 MPS5172G?

For technical support, including MPS5172G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPS5172G requirements.

6.How does Aetrix verify that MPS5172G is sourced from the original manufacturer or authorized distributors?

All MPS5172G 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 MPS5172G meets industry standards.

7.What is the process for return or replacement of MPS5172G?

All MPS5172G units undergo pre-shipment inspection (PSI). If there is an issue with MPS5172G, 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 MPS5172G part is unused and in its original packaging.

Return procedure for MPS5172G:

1.Submit a request within 90 days.

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

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