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onsemi MPSW45AZL1G
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- Part No.:
- MPSW45AZL1G
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 Long Body, Formed Leads
- Datasheet:
-
MPSW45AZL1G.pdf
- Description:
- TRANS NPN DARL 50V 1A TO92
- Quantity:
- Payment:
- Shipping:
Inventory:3,031
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Product details
Overview
MPSW45AZL1G from onsemi is an NPN silicon Darlington transistor in TO-92 package, rated for 1.0 A continuous collector current and 1.0 W dissipation at 25°C ambient, with VCEO = 40 V and DC current gain (hFE) up to 150,000 at IC = 200 mA - used in low-frequency switching and linear amplification stages of power supply control circuits.
For engineers reviewing the MPSW45AZL1G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal behavior, noise characteristics, TO-92 terminal mapping, and validated alternative parts for industrial relay drivers, LED lamp ballasts, and analog sensor interface designs.
Technical Context
The MPSW45AZL1G implements a monolithic Darlington pair architecture with integrated base-emitter resistor network absent - requiring external base drive. It operates in linear and saturation regions with VCE(sat) ≤ 1.5 V at IC = 1.0 A / IB = 2.0 mA and exhibits fT = 100 MHz under small-signal conditions.
Thermal design relies on RθJA = 125°C/W (ambient) and RθJC = 50°C/W (case), supporting operation from −55°C to +150°C junction temperature. Noise performance is characterized across 10 Hz–15.7 kHz bandwidth, with wideband noise voltage < 2.0 nV/√Hz at IC = 10 µA and source resistance < 1 kΩ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 40 V - Maximum allowable collector-emitter voltage before breakdown in open-base configuration; defines safe operating voltage headroom in relay coil or lamp driver circuits. |
| IC (continuous) | 1.0 A - Continuous DC collector current rating; sets upper limit for sustained load switching without derating at 25°C ambient. |
| PD @ TA = 25°C | 1.0 W - Total device power dissipation limit at room temperature; requires heatsinking or airflow above 25°C per 8 mW/°C derating slope. |
| hFE (min) | 25,000 at IC = 200 mA - Minimum DC current gain; enables high-current output with low base drive current (e.g., ~8 µA base for 200 mA collector). |
| VCE(sat) | ≤1.5 V at IC = 1.0 A / IB = 2.0 mA - Saturation voltage drop; determines conduction loss and heat generation in switch-mode applications. |
| fT | 100 MHz - Current-gain bandwidth product; confirms suitability for audio-frequency amplification and low-speed digital switching (≤10 MHz edge rates). |
| RθJA | 125°C/W - Junction-to-ambient thermal resistance; informs PCB copper area requirements and natural convection cooling needs for thermal compliance. |
Pinout & Package
Package: TO-92 (Case 29-10), Pb-free, straight-lead ammo pack configuration. Body marking "MPSW45" with "ZL1G" suffix indicates Pb-free TO-92 variant in ammo packaging.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Emitting terminal of Darlington pair | Connected to ground or low-side return path; carries full load current and defines reference for base drive polarity. |
| 2 (Base) | Control input for Darlington pair | Receives current-limited drive signal; base-emitter junction forward-biased to initiate conduction; no internal bias resistor. |
| 3 (Collector) | High-side output terminal | Connected to positive rail or inductive load; sustains up to 40 V when off and conducts up to 1.0 A when saturated. |
Key Features
| Feature | Design Value |
|---|---|
| High DC current gain | hFE ≥ 25,000 at IC = 200 mA - reduces required base drive current by >10× versus standard NPN transistors, easing microcontroller GPIO sourcing. |
| Low saturation voltage | VCE(sat) ≤ 1.5 V at IC = 1.0 A - minimizes conduction loss in high-current switching, improving efficiency in 12 V lamp or solenoid drivers. |
| Wide operating temperature | −55°C to +150°C junction range - supports deployment in automotive engine compartments, industrial PLC modules, and outdoor lighting controls. |
| Low-noise amplification | en < 2.0 nV/√Hz at 1 kHz (RS = 1 kΩ) - enables use in precision analog front-ends for current sensing and thermistor signal conditioning. |
| Pb-free TO-92 package | RoHS-compliant lead finish and packaging - meets IPC-J-STD-020 moisture sensitivity level 1 (MSL-1); compatible with standard through-hole reflow and wave soldering. |
Applications
| Industrial Relay Drivers | AC Lamp Ballast Control |
|---|---|
|
Use Scenario: Driving 24 VDC industrial relays with 500 mA coil current in programmable logic controller (PLC) output modules. IC Role / Device Role / Timing Role: High-gain Darlington switch providing galvanically isolated load control via optocoupler-driven base input. Use Value: Enables direct GPIO-level base drive (≤10 µA) while sustaining 500 mA relay coil current with <1.5 V dropout, reducing board-level driver complexity. |
Use Scenario: Controlling filament current in 12 V halogen lamp dimming circuits using PWM-based analog current regulation. IC Role / Device Role / Timing Role: Linear pass element operating in active region to regulate lamp current with feedback loop compensation. Use Value: Delivers stable 1.0 A continuous current with <2.0 nV/√Hz noise floor, minimizing visible flicker and preserving lamp lifetime. |
| Thermistor Signal Amplifiers | Low-Voltage Solenoid Actuators |
|
Use Scenario: Amplifying low-level voltage from 10 kΩ NTC thermistors in HVAC temperature monitoring circuits. IC Role / Device Role / Timing Role: Low-noise, high-input-impedance emitter-follower buffer stage preceding ADC input. Use Value: Maintains signal integrity with <2.0 nV/√Hz input-referred noise and hFE-stabilized bias, enabling ±0.1°C measurement resolution. |
Use Scenario: Energizing 5 V, 800 mA DC solenoids in medical fluid valve assemblies with microcontroller-controlled pulse-width modulation. IC Role / Device Role / Timing Role: Saturated switch delivering full solenoid current during ON phase; fast turn-off aided by base discharge path. Use Value: Achieves <1.5 V VCE(sat) at 800 mA, limiting power loss to <1.2 W and eliminating need for external heat sink in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Darlington transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPSW45A | VCEO = 50 V (vs. 40 V), same TO-92 package and hFE profile; non-Pb-free version. | Preferred where higher voltage margin is needed (e.g., 48 V bus transient suppression), but not RoHS-compliant. | Select MPSW45A only if Pb-free compliance is waived and 50 V VCEO is required; otherwise prefer MPSW45AZL1G for new designs. |
| ULN2003A | 7-channel Darlington array in SO-16; built-in base resistors and clamp diodes; max IO = 500 mA per channel. | Used in multi-load digital logic interfacing (e.g., stepper motor phases), not single high-current linear amplification. | Choose ULN2003A for parallel low-voltage logic-level loads; MPSW45AZL1G remains superior for single 1.0 A analog or high-voltage switching tasks. |
Compared with MPSW45A and ULN2003A, the MPSW45AZL1G offers optimal balance of single-device 1.0 A capability, 40 V rating, Pb-free compliance, and low-noise linearity - making it the preferred choice for discrete high-gain, high-current analog switching where array integration or extended voltage margin are unnecessary.
Availability
MPSW45AZL1G is available at Aetrix Electronics and suitable for industrial relay drivers, AC lamp ballast control, thermistor signal amplifiers, and low-voltage solenoid actuators requiring stable component supply and long-term obsolescence management.
Supply support for MPSW45AZL1G 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, sensors, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The MPSW45 series belongs to onsemi's general-purpose bipolar transistor portfolio, designed specifically for cost-sensitive, high-reliability linear and switching applications in industrial controls, lighting, and power conversion systems.
FAQ
What is the maximum collector-emitter voltage rating for MPSW45AZL1G?
The MPSW45AZL1G has a guaranteed minimum V(BR)CES of 40 Vdc at IC = 100 µA with open base. This rating applies under DC or low-frequency pulsed conditions and must be derated for temperature, layout parasitics, and inductive load flyback spikes. Exceeding 40 V risks irreversible breakdown.
Does MPSW45AZL1G include an integrated base resistor?
No, the MPSW45AZL1G is a bare Darlington transistor without internal base-emitter or base-collector resistors. External base current limiting is mandatory - typically achieved with a series resistor between microcontroller GPIO and pin 2 (base) to ensure IB stays within safe limits for target IC.
Can MPSW45AZL1G be used in linear amplifier configurations?
Yes, the MPSW45AZL1G supports linear operation with verified noise performance (en < 2.0 nV/√Hz) and stable hFE across IC = 1 mA to 500 mA. Its fT = 100 MHz and low distortion in active region make it suitable for audio preamplifiers and sensor signal conditioning - provided thermal limits are observed.
What is the thermal resistance from junction to case for MPSW45AZL1G?
The MPSW45AZL1G has RθJC = 50°C/W, measured from die junction to TO-92 case surface. This value enables accurate junction temperature estimation when mounted on a heatsink or thermally conductive PCB pad. For example, at 1.0 W dissipation and 25°C case temperature, TJ = 75°C.
Is MPSW45AZL1G RoHS-compliant and halogen-free?
Yes, the "G" suffix in MPSW45AZL1G explicitly denotes Pb-free (RoHS-compliant) construction per onsemi documentation. The device meets JEDEC J-STD-020 MSL-1 requirements and contains no brominated flame retardants or chlorine-based compounds in its mold compound or lead finish.
MPSW45AZL1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 Long Body, Formed Leads
- Packaging:
- Tape & Box (TB)
- 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)
MPSW45AZL1G FAQ
1.How can I place an order for MPSW45AZL1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MPSW45AZL1G 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 MPSW45AZL1G reliable?
The price and inventory of MPSW45AZL1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPSW45AZL1G is usually 5 days.
3.What payment methods are accepted for MPSW45AZL1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPSW45AZL1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPSW45AZL1G?
MPSW45AZL1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPSW45AZL1G 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 MPSW45AZL1G?
For technical support, including MPSW45AZL1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPSW45AZL1G requirements.
6.How does Aetrix verify that MPSW45AZL1G is sourced from the original manufacturer or authorized distributors?
All MPSW45AZL1G 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 MPSW45AZL1G meets industry standards.
7.What is the process for return or replacement of MPSW45AZL1G?
All MPSW45AZL1G units undergo pre-shipment inspection (PSI). If there is an issue with MPSW45AZL1G, 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 MPSW45AZL1G part is unused and in its original packaging.
Return procedure for MPSW45AZL1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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