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onsemi MPSW45AZL1
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- Part No.:
- MPSW45AZL1
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 Long Body, Formed Leads
- Datasheet:
-
MPSW45AZL1.pdf
- Description:
- TRANS NPN DARL 50V 1A TO92
- Quantity:
- Payment:
- Shipping:
Inventory:2,370
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Product details
Overview
MPSW45AZL1 from onsemi is an NPN silicon Darlington transistor in a TO-92 package, rated for 1.0 W total device dissipation at TA = 25°C, 40 V C-E breakdown voltage, and 1.0 A continuous collector current. It delivers high DC current gain (hFE ≥ 4,000 at IC = 1.0 A), low saturation voltage (VCE(sat) ≤ 1.5 V), and operates across −55°C to +150°C junction temperature - used in low-frequency switching and linear amplification stages of power supply control circuits.
For engineers reviewing the MPSW45AZL1 datasheet, pinout, applications, or equivalent options, key selection criteria include its Darlington configuration for high-current drive with minimal base drive, thermal resistance (RθJA = 125°C/W), TO-92 mechanical compatibility, and Pb-free packaging per onsemi's RoHS-compliant offering.
Technical Context
The MPSW45AZL1 implements a monolithic NPN Darlington pair structure, delivering high current gain without external biasing components. Its electrical behavior is characterized by two cascaded NPN transistors sharing emitter-collector paths, enabling IC/IB ratios up to 1000 while maintaining VBE(sat) ≤ 2.0 V and fT = 100 MHz under specified test conditions.
Thermal performance is defined by RθJC = 50°C/W and RθJA = 125°C/W, supporting operation in ambient-limited PCB layouts. The device exhibits low noise characteristics (en < 2.0 nV/√Hz at 1 kHz, IC = 1.0 mA) and stable hFE over collector current (4,000–150,000 range), making it suitable for analog sensing interfaces and precision current amplification where base drive efficiency matters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Collector-Emitter Voltage (VCES) | 40 V - Maximum safe voltage across C-E before breakdown; defines maximum load swing in switching applications. |
| Continuous Collector Current (IC) | 1.0 A - Sustained output current capability; sets upper limit for relay drivers or lamp controls. |
| DC Current Gain (hFE) | 4,000 min at IC = 1.0 A - Enables microamp-level base drive for full-load switching; reduces MCU GPIO loading. |
| Collector-Emitter Saturation Voltage (VCE(sat)) | ≤1.5 V at IC = 1.0 A, IB = 2.0 mA - Limits conduction loss and self-heating in saturated-switch mode. |
| Thermal Resistance (RθJA) | 125°C/W - Determines junction temperature rise per watt dissipated in still-air environments. |
| Transition Frequency (fT) | 100 MHz - Supports bandwidth-critical analog amplification up to audio frequencies with stable gain. |
| Package | TO-92 (Case 29-10) - Standard through-hole plastic package; compatible with legacy wave-solder and manual assembly. |
Pinout & Package
Package: TO-92 (Case 29-10), 1 W rating, straight-lead ammo-pack variant (MPSW45AZL1). Pin identification follows Style 2: Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Base) | Control input terminal | Receives low-current drive signal; enables Darlington action with high effective β; requires current-limiting resistor in series. |
| Pin 2 (Emitter) | Common emitter node | Reference point for input and output; connected to ground or common rail in common-emitter configurations. |
| Pin 3 (Collector) | High-current output terminal | Switches or sinks load current up to 1.0 A; connects to positive supply via load in low-side switch topology. |
Key Features
| Feature | Design Value |
|---|---|
| Darlington architecture | Monolithic NPN pair delivering hFE ≥ 4,000 at full 1.0 A load - eliminates need for external gain-staging transistors. |
| Pb-free TO-92 packaging | RoHS-compliant construction with standardized footprint - ensures compatibility with automated assembly and environmental compliance programs. |
| Low VCE(sat) | ≤1.5 V at IC = 1.0 A - reduces power loss and thermal stress in high-duty-cycle switching applications. |
| Wide operating temperature | −55°C to +150°C TJ range - supports deployment in automotive engine compartments and industrial motor controls. |
| High fT bandwidth | 100 MHz transition frequency - enables use in audio preamplifiers and fast-response current-sense amplifiers. |
Applications
| Power Supply Feedback Control | Relay Driver Circuit |
|---|---|
|
Use Scenario: Regulating output voltage in isolated flyback converters using optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Acts as error amplifier output stage, sinking current into optocoupler LED to adjust duty cycle. Use Value: High hFE allows direct drive from TL431 reference without additional transistor staging; VCE(sat) ≤ 1.5 V ensures tight regulation margin. |
Use Scenario: Driving 12 V/500 mA electromagnetic relay coil from microcontroller GPIO. IC Role / Device Role / Timing Role: Low-side switch controlling relay coil return path; base driven via 10 kΩ resistor from 3.3 V MCU pin. Use Value: 1.0 A rating and 4,000 hFE enable reliable activation with < 300 µA base current; TO-92 fits compact PCB layouts. |
| LED Lamp Dimming Interface | Industrial Sensor Signal Amplifier |
|
Use Scenario: PWM-controlled dimming of high-brightness LED strings in signage systems. IC Role / Device Role / Timing Role: Saturates and cuts off as a current sink during PWM cycles; handles peak LED currents up to 800 mA. Use Value: Low VCE(sat) minimizes heat generation during 100% duty cycle; TO-92 allows heatsink clip attachment if needed. |
Use Scenario: Amplifying low-level current output from photodiode or thermopile sensors in HVAC controllers. IC Role / Device Role / Timing Role: Transimpedance amplifier front-end stage converting nanoamp sensor current to usable voltage. Use Value: 100 MHz fT and low noise (<2 nV/√Hz) preserve signal integrity; high hFE improves SNR by reducing base current error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Darlington transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPSW45A | Higher VCES = 50 V and VCBO = 60 V; otherwise identical TO-92 package and gain specs. | Preferred in 24 V industrial control systems where higher voltage margin is required. | Select MPSW45A when operating above 40 V supply rails or requiring enhanced avalanche robustness. |
| ULN2003A | 7-channel Darlington array in SO-16; integrated base resistors and clamp diodes; max 500 mA per channel. | Suitable for multi-load digital logic interfacing (e.g., stepper motor phases, solenoid banks), not single high-current loads. | Choose ULN2003A only for multi-output logic-level translation; not a drop-in replacement for MPSW45AZL1's discrete high-current capability. |
Compared with MPSW45A and ULN2003A, the MPSW45AZL1 offers optimal balance of single-channel 1.0 A drive, 40 V rating, and TO-92 simplicity - ideal for cost-sensitive, space-constrained designs needing one robust Darlington switch without array overhead or over-spec voltage margins.
Availability
MPSW45AZL1 is available at Aetrix Electronics and suitable for power supply feedback control, relay driver circuits, LED lamp dimming interfaces, and industrial sensor signal amplifiers requiring stable component supply and long-term manufacturability.
Supply support for MPSW45AZL1 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 MPSW45AZL1 belongs to onsemi's legacy discrete transistor product line, engineered for high-reliability linear and switching applications where Darlington gain, thermal stability, and TO-92 compatibility are essential design requirements.
FAQ
What is the maximum continuous collector current rating for MPSW45AZL1?
The MPSW45AZL1 is rated for 1.0 A continuous collector current (IC) at TA = 25°C. Derating applies above 25°C ambient - 8.0 mW/°C for ambient-limited operation and 20 mW/°C when case-mounted to a heatsink. This rating ensures reliable operation in relay drivers and power supply feedback stages without exceeding thermal limits.
Does MPSW45AZL1 have Pb-free packaging?
Yes, MPSW45AZL1 is supplied in a Pb-free TO-92 package compliant with RoHS Directive 2011/65/EU. The "ZL1" suffix denotes ammo-pack packaging, and the device carries onsemi's standard Pb-free marking - either "G" suffix or microdot indicator - confirming lead-free terminations and molding compound.
What is the pin configuration of MPSW45AZL1 in TO-92?
MPSW45AZL1 uses TO-92 Style 2 pinout: Pin 1 is Base, Pin 2 is Emitter, Pin 3 is Collector. This matches the standard NPN Darlington orientation shown in onsemi's package drawings and is verified in the mechanical outline documentation (Case 29-10, Issue D).
Can MPSW45AZL1 replace MPSW45A in existing designs?
MPSW45AZL1 can replace MPSW45A only if the application operates below 40 V C-E voltage - since MPSW45AZL1 has VCES = 40 V versus 50 V for MPSW45A. All other parameters (hFE, VCE(sat), package, pinout) are identical; no layout change is needed, but voltage margin must be verified.
What is the typical DC current gain (hFE) of MPSW45AZL1 at 1.0 A collector current?
The MPSW45AZL1 guarantees hFE ≥ 4,000 at IC = 1.0 A, VCE = 5.0 V, and TA = 25°C. This high minimum gain enables efficient base drive from low-power sources such as microcontroller GPIOs or op-amp outputs, reducing external component count in Darlington-based amplifier or switch designs.
MPSW45AZL1 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)
MPSW45AZL1 FAQ
1.How can I place an order for MPSW45AZL1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MPSW45AZL1 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 MPSW45AZL1 reliable?
The price and inventory of MPSW45AZL1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPSW45AZL1 is usually 5 days.
3.What payment methods are accepted for MPSW45AZL1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPSW45AZL1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPSW45AZL1?
MPSW45AZL1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPSW45AZL1 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 MPSW45AZL1?
For technical support, including MPSW45AZL1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPSW45AZL1 requirements.
6.How does Aetrix verify that MPSW45AZL1 is sourced from the original manufacturer or authorized distributors?
All MPSW45AZL1 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 MPSW45AZL1 meets industry standards.
7.What is the process for return or replacement of MPSW45AZL1?
All MPSW45AZL1 units undergo pre-shipment inspection (PSI). If there is an issue with MPSW45AZL1, 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 MPSW45AZL1 part is unused and in its original packaging.
Return procedure for MPSW45AZL1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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