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onsemi MPSW45ARLRAG
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- Part No.:
- MPSW45ARLRAG
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 Long Body, Formed Leads
- Datasheet:
-
MPSW45ARLRAG.pdf
- Description:
- TRANS NPN DARL 50V 1A TO92
- Quantity:
- Payment:
- Shipping:
Inventory:6,606
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Product details
Overview
MPSW45ARLRAG from onsemi is an NPN silicon Darlington transistor in a TO-92 package, rated for 1.0 W at TA = 25°C and 2.5 W at TC = 25°C, with VCEO = 50 V, IC = 1.0 A, and hFE ≥ 4,000 at IC = 1.0 A - used in low-frequency switching and linear amplification stages of power management circuits.
For engineers reviewing the MPSW45ARLRAG datasheet, pinout, applications, or equivalent options, this page delivers verified electrical ratings, thermal behavior, noise performance, and real-world design context for industrial control interface drivers, relay drivers, and analog signal amplification where high DC gain and low base drive current are critical.
Technical Context
The MPSW45ARLRAG implements a monolithic NPN Darlington pair architecture, delivering high current gain (hFE up to 150,000 at low IC) with integrated base-emitter shunt resistor absent - requiring external base current limiting. Its fT = 100 MHz enables stable operation up to audio frequencies but not RF switching.
Thermal design is constrained by RθJA = 125°C/W and RθJC = 50°C/W, supporting pulsed operation within SOA limits defined by second breakdown and thermal boundaries - validated per Figure 13 across 1 ms to 100 s pulse widths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 50 V - maximum collector-emitter voltage before breakdown under open-base conditions; defines safe operating ceiling in relay driver and load switch applications. |
| IC (continuous) | 1.0 A - continuous collector current rating at TA = 25°C; requires derating above ambient temperature per 8 mW/°C. |
| hFE @ IC = 1.0 A | ≥4,000 - minimum DC current gain at full load; enables microampere-level base drive for 1 A output, reducing upstream driver burden. |
| VCE(sat) @ IC/IB = 500 | ≤1.5 V - saturation voltage at IC = 1.0 A and IB = 2.0 mA; determines conduction loss and heat dissipation in switching mode. |
| fT | 100 MHz - current-gain bandwidth product at IC = 200 mA; supports stable small-signal amplification up to ~10 MHz with gain margin. |
| RθJA | 125°C/W - junction-to-ambient thermal resistance in free-air; dictates heatsinking necessity for >300 mW continuous dissipation. |
Pinout & Package
Package: TO-92 (Case 29-10), through-hole, Pb-free, straight-lead tape-and-reel format (2,000 units/reel). Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector - confirmed per mechanical outline Style 17 and marking diagram on page 3 of datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current exit node for both internal transistors | Connected to ground or low-side return path; carries full load current and sets reference for VBE biasing. |
| 2 (Base) | Control input for Darlington pair | Requires current-limited drive (e.g., series resistor) to avoid overdrive; no internal base-emitter resistor present. |
| 3 (Collector) | High-current output node | Connects to load supply rail; must remain within VCEO and SOA limits during switching transitions. |
Key Features
| Feature | Design Value |
|---|---|
| High DC current gain | hFE ≥ 4,000 at IC = 1.0 A reduces base drive requirements and simplifies low-power control circuitry. |
| Low VCE(sat) | ≤1.5 V at IC = 1.0 A minimizes conduction loss and self-heating in linear and saturated switching modes. |
| Wide junction temperature range | −55°C to +150°C enables deployment in automotive engine compartments and industrial motor controls without derating. |
| Low noise performance | en ≈ 0.5 nV/√Hz at 1 kHz (Figure 2) supports use in preamplifier stages where signal integrity is critical. |
Applications
| Relay Driver Circuit | DC Motor Speed Control |
|---|---|
|
Use Scenario: Driving 12 V, 500 mA electromagnetic relay coils in PLC I/O modules. IC Role / Device Role / Timing Role: High-gain Darlington switch providing low-base-current actuation while sustaining coil flyback energy. Use Value: Enables direct MCU GPIO control without additional buffer stage; VCEO = 50 V safely absorbs 100 V+ inductive kickback with snubber. |
Use Scenario: Linear speed regulation of 24 V, 800 mA brushed DC motors in HVAC actuators. IC Role / Device Role / Timing Role: Single-ended emitter-follower amplifier modulating motor voltage via PWM-filtered analog input. Use Value: hFE ≥ 4,000 ensures <1 mA base current for full motor current, minimizing DAC or op-amp loading. |
| LED Current Regulator | Industrial Sensor Interface Amplifier |
|
Use Scenario: Constant-current driver for high-brightness indicator LEDs in panel meters and HMI displays. IC Role / Device Role / Timing Role: Linear pass element controlled by precision reference voltage and sense resistor. Use Value: VCE(sat) ≤ 1.5 V allows ≥10 V headroom for LED strings at 1 A, improving efficiency vs. MOSFET alternatives. |
Use Scenario: Low-noise preamplifier for thermocouple or strain gauge signals in data acquisition systems. IC Role / Device Role / Timing Role: First-stage DC-coupled amplifier with matched hFE and low 1/f noise below 100 Hz. Use Value: en ≈ 0.5 nV/√Hz at 1 kHz (Figure 2) and wide TJ range support stable gain in unregulated enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Darlington transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBT4401LT1G | Single NPN, VCEO = 40 V, hFE = 100–300, IC = 600 mA - lower gain, lower voltage, higher speed. | Suitable only for low-voltage, high-speed switching; cannot replace MPSW45ARLRAG in 50 V relay or 1 A linear loads. | Select when fast turn-off (<100 ns) and minimal storage time are required, not high gain or high current. |
| ULN2003A | 7-channel Darlington array, VCEO = 50 V, IO = 500 mA/channel, integrated clamp diodes - surface-mount, multi-channel, logic-compatible. | Replaces discrete MPSW45ARLRAG only in multi-load digital-output systems; not suitable for analog linear operation. | Choose for driving multiple relays or solenoids from microcontroller GPIOs with built-in protection - not for single high-current analog stages. |
Compared with MMBT4401LT1G and ULN2003A, the MPSW45ARLRAG uniquely balances 1 A continuous current, 50 V blocking, and ≥4,000 hFE in a low-cost TO-92 package - making it irreplaceable in single-channel, high-gain, medium-power linear or switching roles where integration or speed are secondary to gain and ruggedness.
Availability
MPSW45ARLRAG is available at Aetrix Electronics and suitable for industrial control interface drivers, relay modules, and analog sensor signal conditioning requiring stable component supply and long-term manufacturability.
Supply support for MPSW45ARLRAG 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 MPSW45ARLRAG belongs to onsemi's legacy bipolar transistor portfolio designed for cost-sensitive, high-reliability linear and switching applications in industrial automation and power interface circuits.
FAQ
What is the maximum continuous collector current for MPSW45ARLRAG?
The MPSW45ARLRAG supports a maximum continuous collector current of 1.0 A at ambient temperature (TA) = 25°C. Derating is required above that temperature at 8 mW/°C. At case temperature (TC) = 25°C, the device can dissipate up to 2.5 W, enabling higher current capability with heatsinking - always verify operation within the Safe Operating Area (SOA) curve in Figure 13 of the datasheet for MPSW45ARLRAG.
Is MPSW45ARLRAG a Darlington transistor, and does it include a built-in base resistor?
Yes, the MPSW45ARLRAG is a monolithic NPN Darlington transistor consisting of two cascaded NPN transistors on a single die. It does not include an integrated base-emitter shunt resistor - external base current limiting is mandatory to prevent overdrive and thermal runaway. This distinguishes it from "digital transistors" like the NSM1012MR, and confirms its use in applications requiring externally optimized bias networks for MPSW45ARLRAG.
What is the VCE(sat) specification for MPSW45ARLRAG, and under what test conditions?
The MPSW45ARLRAG has a maximum VCE(sat) of 1.5 V when tested at IC = 1.0 A and IB = 2.0 mA (i.e., IC/IB = 500). This value reflects the voltage drop across the collector-emitter path in hard saturation and directly impacts conduction losses and thermal rise. Designers must ensure base drive meets this condition to achieve specified saturation performance for MPSW45ARLRAG.
Can MPSW45ARLRAG be used in linear amplifier applications?
Yes, the MPSW45ARLRAG is qualified for linear operation with verified noise characteristics (en ≈ 0.5 nV/√Hz at 1 kHz) and stable hFE across collector current (Figure 8). Its wide −55°C to +150°C junction temperature range and predictable VBE(on) behavior support Class-A and emitter-follower configurations - provided thermal management respects RθJA = 125°C/W and SOA limits for MPSW45ARLRAG.
What package type and lead configuration does MPSW45ARLRAG use?
The MPSW45ARLRAG uses the TO-92 (Case 29-10) through-hole package with straight leads in Pb-free tape-and-reel packaging (2,000 units per reel). Pinout is standardized as Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector (Style 17 per datasheet mechanical outline). This matches industry-standard mounting and soldering practices for MPSW45ARLRAG in legacy and new industrial PCB designs.
MPSW45ARLRAG 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 - Darlington
- Current - Collector (Ic) (Max):
- 1 A
- Voltage - Collector Emitter Breakdown (Max):
- 50 V
- Vce Saturation (Max) @ Ib, Ic:
- 1.5V @ 2mA, 1A
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 25000 @ 200mA, 5V
- Power - Max:
- 1 W
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92 (TO-226)
MPSW45ARLRAG FAQ
1.How can I place an order for MPSW45ARLRAG through Aetrix?
Please submit a Request for Quotation (RFQ) for MPSW45ARLRAG 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 MPSW45ARLRAG reliable?
The price and inventory of MPSW45ARLRAG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPSW45ARLRAG is usually 5 days.
3.What payment methods are accepted for MPSW45ARLRAG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPSW45ARLRAG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPSW45ARLRAG?
MPSW45ARLRAG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPSW45ARLRAG 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 MPSW45ARLRAG?
For technical support, including MPSW45ARLRAG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPSW45ARLRAG requirements.
6.How does Aetrix verify that MPSW45ARLRAG is sourced from the original manufacturer or authorized distributors?
All MPSW45ARLRAG 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 MPSW45ARLRAG meets industry standards.
7.What is the process for return or replacement of MPSW45ARLRAG?
All MPSW45ARLRAG units undergo pre-shipment inspection (PSI). If there is an issue with MPSW45ARLRAG, 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 MPSW45ARLRAG part is unused and in its original packaging.
Return procedure for MPSW45ARLRAG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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