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

onsemi MPSA44RLRAG

Name: MPSA44RLRAG
Brand: onsemi
SKU: MPSA44RLRAG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MPSA44RLRAG

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: MPSA44RLRAG.pdf

Description:: TRANS NPN 400V 0.3A TO92

Quantity:: RFQ Add To RFQ list

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Inventory:4,650

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Product details

Overview

MPSA44RLRAG from onsemi is an NPN silicon high-voltage general-purpose transistor rated for 400 V_CEO, 500 V_CBO, and 300 mA continuous collector current in a TO-92 package. It delivers DC current gain (h_FE) of 40–200 across 1–100 mA, with V_CE(sat) ≤ 0.75 V at I_C/I_B = 10, and is optimized for high-voltage switching in relay drivers and CRT horizontal deflection circuits.

For engineers reviewing the MPSA44RLRAG datasheet, pinout, applications, or equivalent options, key selection criteria include its 400 V breakdown rating, TO-92 Pb-free tape-and-reel packaging (2000 units), thermal resistance (R_JA = 200 °C/W), and verified performance in high-voltage linear and switching amplifier stages.

Technical Context

The MPSA44RLRAG operates as a discrete NPN bipolar junction transistor with a maximum V_CEO of 400 V and V_CBO of 500 V, enabling use in off-line switch-mode power supply feedback circuits and flyback transformer drive stages. Its h_FE range (40–200) and low saturation voltage support stable biasing in high-impedance collector loads.

Designed for high-voltage analog and switching applications, it exhibits C_obo = 7.0 pF and C_ibo = 130 pF at specified test conditions, with safe operating area (SOA) validated up to 100 V and 100 mA under pulsed conditions. Thermal limits are defined by R_JC = 83.3 °C/W and R_JA = 200 °C/W.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	400 V - Supports operation in 230 VAC-derived circuits without breakdown risk
I_C (continuous)	300 mA - Sufficient for driving small relays, indicator LEDs, and low-power solenoids
h_FE @ 10 mA	50–200 - Enables predictable base drive design for linear amplification or saturated switching
V_CE(sat) @ 50 mA	≤ 0.75 V - Minimizes conduction loss in high-side or low-side switching configurations
P_D @ T_A = 25°C	625 mW - Allows direct PCB mounting without heatsink in ambient-ventilated designs
C_obo	7.0 pF - Limits high-frequency Miller effect in >1 MHz switching applications
T_J range	−55 to +150 °C - Qualified for industrial and automotive under-hood environments

Pinout & Package

Package: TO-92 (Case 29-11, Style 1), Pb-free, tape-and-reel format (2000 units per reel). Dimensions conform to ANSI Y14.5M-1982; leads are uncontrolled beyond K and P dimensions.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Reference node for base-emitter bias; connected to ground or low-impedance return path
2 (Base)	Control input	Receives current-limited drive signal to modulate collector current; requires series resistor for I_B limiting
3 (Collector)	High-voltage output node	Connects to load (e.g., relay coil, transformer primary); withstands up to 400 V when off

Key Features

Feature	Design Value
High V_CEO rating	400 V enables direct interface with 230 VAC rectified rails without external snubbers
Pb-free TO-92 package	Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow profiles
Wide h_FE range	40–200 supports consistent gain matching across production lots in amplifier bias networks
Low C_ibo	130 pF minimizes base drive loading in high-frequency oscillator and pulse generator circuits
Validated SOA	Second breakdown limit confirmed up to 100 V/100 mA pulses (1 ms, 10% duty cycle)

Applications

Relay Driver Circuits	CRT Horizontal Deflection
Use Scenario: Driving 12 V/24 V electromagnetic relays in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Discrete NPN switch controlling relay coil current with fast turn-on/turn-off response. Use Value: 400 V_CEO withstands inductive kickback spikes without clamping diodes in many designs.	Use Scenario: Horizontal output stage in legacy CRT monitors and TVs. IC Role / Device Role / Timing Role: High-voltage switching transistor in flyback transformer primary drive circuit. Use Value: Validated safe operating area up to 150 V and 100 mA supports line-scan timing integrity.
Off-Line SMPS Feedback	High-Voltage Linear Amplifier
Use Scenario: Optocoupler-coupled feedback path in AC/DC adapters rated ≥ 36 W. IC Role / Device Role / Timing Role: Transistor-level interface between optocoupler output and PWM controller reference pin. Use Value: Low V_CE(sat) ensures stable reference voltage under varying load conditions.	Use Scenario: Audio or instrumentation amplifier output stage requiring >200 V swing capability. IC Role / Device Role / Timing Role: Class-A or class-AB emitter-follower buffer stage. Use Value: h_FE ≥ 50 at 10 mA ensures predictable current sourcing into high-impedance loads.

Relay Driver Circuits

CRT Horizontal Deflection

Use Scenario: Driving 12 V/24 V electromagnetic relays in industrial PLC I/O modules.

IC Role / Device Role / Timing Role: Discrete NPN switch controlling relay coil current with fast turn-on/turn-off response.

Use Value: 400 V_CEO withstands inductive kickback spikes without clamping diodes in many designs.

Use Scenario: Horizontal output stage in legacy CRT monitors and TVs.

IC Role / Device Role / Timing Role: High-voltage switching transistor in flyback transformer primary drive circuit.

Use Value: Validated safe operating area up to 150 V and 100 mA supports line-scan timing integrity.

Off-Line SMPS Feedback

High-Voltage Linear Amplifier

Use Scenario: Optocoupler-coupled feedback path in AC/DC adapters rated ≥ 36 W.

IC Role / Device Role / Timing Role: Transistor-level interface between optocoupler output and PWM controller reference pin.

Use Value: Low V_CE(sat) ensures stable reference voltage under varying load conditions.

Use Scenario: Audio or instrumentation amplifier output stage requiring >200 V swing capability.

IC Role / Device Role / Timing Role: Class-A or class-AB emitter-follower buffer stage.

Use Value: h_FE ≥ 50 at 10 mA ensures predictable current sourcing into high-impedance loads.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage NPN transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MPSA42RLRAG	V_CEO = 300 V (lower than MPSA44RLRAG's 400 V); otherwise identical TO-92 Pb-free tape-and-reel packaging and h_FE range	Not suitable for 400 V rail applications; limited to ≤300 V off-line circuits	Select only if system max V_CE remains below 280 V with margin
BC639-16	V_CEO = 80 V; higher h_FE (min 100); same TO-92 package but not Pb-free certified per J-STD-020	Restricted to low-voltage logic-level switching; incompatible with high-voltage transient environments	Use only in 5–24 V systems where gain stability is prioritized over voltage rating

Compared with MPSA44RLRAG, MPSA42RLRAG offers identical form factor and process but reduced voltage headroom, while BC639-16 trades voltage capability for higher gain in low-voltage applications-neither is a drop-in replacement, and PCB layout must be verified for each.

Availability

MPSA44RLRAG is available at Aetrix Electronics and suitable for relay driver circuits, CRT deflection stages, and off-line SMPS feedback paths requiring stable component supply, RoHS compliance, and TO-92 tape-and-reel logistics.

Supply support for MPSA44RLRAG 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 focused on energy-efficient technologies for automotive, industrial, cloud, and intelligent edge applications.

The MPSA44RLRAG belongs to onsemi's high-voltage bipolar transistor product line, engineered specifically for robust switching and amplification in off-line power conversion, display deflection, and industrial control systems.

FAQ

What is the maximum collector-emitter voltage rating for MPSA44RLRAG?

The MPSA44RLRAG has a guaranteed minimum V_(BR)CEO of 400 Vdc at I_C = 1.0 mAdc and I_B = 0. This rating is validated per onsemi's published datasheet (Publication Order Number: MPSA44/D, Rev. 4) and defines the absolute maximum blocking voltage before avalanche conduction begins. Designers must maintain derating margins per application stress conditions.

Is MPSA44RLRAG lead-free and RoHS compliant?

Yes, MPSA44RLRAG is a Pb-free device manufactured in accordance with EU RoHS Directive 2011/65/EU. The "G" suffix in the part number and marking diagram confirm Pb-free packaging, and the TO-92 case meets JEDEC J-STD-020 moisture sensitivity and reflow profile requirements.

What is the typical DC current gain (h_FE) of MPSA44RLRAG at 10 mA collector current?

At I_C = 10 mAdc and V_CE = 10 Vdc, the MPSA44RLRAG exhibits h_FE ranging from 50 (minimum) to 200 (maximum), as specified in the Electrical Characteristics table of the official datasheet. This wide range reflects process variation and requires design margining for critical bias networks.

Can MPSA44RLRAG replace MPSA44 in existing designs?

Yes, MPSA44RLRAG is functionally and mechanically identical to MPSA44, differing only in packaging format (tape-and-reel vs. bulk) and Pb-free compliance. Pinout, electrical specs, thermal characteristics, and SOA are fully aligned-no schematic or layout changes are needed when substituting MPSA44RLRAG for MPSA44.

What is the thermal resistance junction-to-ambient (R_JA) for MPSA44RLRAG in free-air conditions?

The MPSA44RLRAG has a maximum R_JA of 200 °C/W when mounted on a standard FR-4 PCB with no copper pour or heatsinking. This value assumes natural convection cooling and defines the worst-case temperature rise per watt of dissipated power, critical for reliability validation in sealed enclosures.

MPSA44RLRAG 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):: 400 V

Vce Saturation (Max) @ Ib, Ic:: 750mV @ 5mA, 50mA

Current - Collector Cutoff (Max):: 500nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 50 @ 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)

MPSA44RLRAG FAQ

1.How can I place an order for MPSA44RLRAG through Aetrix?

Please submit a Request for Quotation (RFQ) for MPSA44RLRAG 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 MPSA44RLRAG reliable?

The price and inventory of MPSA44RLRAG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPSA44RLRAG is usually 5 days.

3.What payment methods are accepted for MPSA44RLRAG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPSA44RLRAG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MPSA44RLRAG?

MPSA44RLRAG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MPSA44RLRAG 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 MPSA44RLRAG?

For technical support, including MPSA44RLRAG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPSA44RLRAG requirements.

6.How does Aetrix verify that MPSA44RLRAG is sourced from the original manufacturer or authorized distributors?

All MPSA44RLRAG 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 MPSA44RLRAG meets industry standards.

7.What is the process for return or replacement of MPSA44RLRAG?

All MPSA44RLRAG units undergo pre-shipment inspection (PSI). If there is an issue with MPSA44RLRAG, 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 MPSA44RLRAG part is unused and in its original packaging.

Return procedure for MPSA44RLRAG:

1.Submit a request within 90 days.

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

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