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onsemi MPSW01A
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- Part No.:
- MPSW01A
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 Long Body
- Datasheet:
-
MPSW01A.pdf
- Description:
- TRANS NPN 40V 1A TO92
- Quantity:
- Payment:
- Shipping:
Inventory:7,953
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Product details
Overview
MPSW01A from onsemi is an NPN silicon bipolar junction transistor (BJT) rated for 1.0 W at TA = 25°C and 2.5 W at TC = 25°C, with VCEO = 40 V, IC = 1000 mA, and hFE ≥ 50 at IC = 1000 mA. It serves as a medium-power switching or linear amplification device in DC-DC converter feedback paths, relay drivers, and LED load controls.
For engineers reviewing the MPSW01A datasheet, pinout, applications, or equivalent options, key selection criteria include its 40 V VCEO, 1000 mA continuous collector current capability, TO-92 thermal resistance (RJA = 125 °C/W), and Pb-free packaging compliance per onsemi's RoHS strategy.
Technical Context
The MPSW01A operates as a single NPN BJT with fixed gain characteristics optimized for high-current switching at low saturation voltage (VCE(sat) ≤ 0.5 V at IC = 1000 mA, IB = 100 mA). Its fT = 50 MHz supports moderate-frequency amplification up to ~20 MHz under specified bias conditions.
Thermal design relies on its RJC = 50 °C/W and RJA = 125 °C/W ratings, enabling operation up to +150 °C junction temperature when mounted on PCBs with minimal copper area. The device uses standard TO-92 leadframe construction with bent-lead or straight-lead configurations and Pb-free marking "G" or microdot.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 40 V - Maximum safe collector-emitter voltage before breakdown under open-base conditions. |
| IC | 1000 mA - Continuous DC collector current rating defining maximum load drive capability. |
| PD @ TA = 25°C | 1.0 W - Power dissipation limit at ambient temperature; derates 8 mW/°C above 25°C. |
| hFE | ≥50 - Minimum DC current gain at IC = 1000 mA, VCE = 1.0 V, used for base drive sizing. |
| VCE(sat) | ≤0.5 V - Collector-emitter saturation voltage at IC = 1000 mA, IB = 100 mA; determines conduction loss. |
| fT | 50 MHz - Current-gain bandwidth product indicating usable small-signal amplification range. |
| RJA | 125 °C/W - Junction-to-ambient thermal resistance; defines required PCB copper area for thermal management. |
Pinout & Package
Package: TO-92 (Case 29−10, Style 1), 3-lead through-hole plastic package with bent-lead or straight-lead options. Pb-free compliant per onsemi specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Emitter | Current return path; connects to ground or low-side reference in common-emitter configurations. |
| 2 | Base | Control terminal; requires current-limited drive (IB ≈ IC/hFE) to saturate or cut off the transistor. |
| 3 | Collector | High-side current output node; connects to load supply rail or switched power source. |
Key Features
| Feature | Design Value |
|---|---|
| High current handling | Rated for 1000 mA continuous collector current with guaranteed hFE ≥ 50 at full load. |
| Low saturation voltage | VCE(sat) ≤ 0.5 V enables <100 mW conduction loss at 1 A, reducing heat generation in switching applications. |
| Extended voltage rating | VCEO = 40 V exceeds standard 30 V parts (e.g., MPSW01), allowing use in 24 V industrial bus systems. |
| Pb-free packaging | TO-92 package marked "G" or with microdot complies with RoHS Directive 2011/65/EU and JEDEC J-STD-609. |
| Wide temperature range | Operates from −55 °C to +150 °C junction temperature, supporting automotive under-hood and industrial control environments. |
Applications
| Relay Driver Circuit | DC-DC Converter Feedback |
|---|---|
Use Scenario: Driving 12 V/500 mA electromagnetic relay coil in PLC I/O modules. IC Role / Device Role / Timing Role: NPN switch controlling coil current path between VCC and ground. Use Value: VCE(sat) ≤ 0.5 V limits relay coil voltage drop to <0.5 V, ensuring reliable pull-in at low input drive levels. |
Use Scenario: Error amplifier transistor in isolated flyback converter feedback loop. IC Role / Device Role / Timing Role: Linear-mode BJT translating optocoupler output into primary-side PWM controller bias current. Use Value: hFE ≥ 50 at 10–100 mA ensures stable closed-loop gain across temperature without external compensation. |
| LED Load Switch | Industrial Sensor Interface |
Use Scenario: High-brightness LED string driver in factory lighting control panels. IC Role / Device Role / Timing Role: Low-side constant-current switch regulating LED current via base-controlled saturation. Use Value: 1000 mA rating supports multi-LED arrays; RJA = 125 °C/W allows operation on FR-4 without heatsink at 75 °C ambient. |
Use Scenario: Level-shifting interface between 3.3 V microcontroller GPIO and 24 V field sensor inputs. IC Role / Device Role / Timing Role: Digital input buffer converting 24 V logic high to MCU-compatible 0 V/3.3 V signal. Use Value: VCBO = 50 V withstands transient surges on industrial lines; ESD-tolerant structure reduces need for external protection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN high-current transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPSW01 | VCEO = 30 V, VCBO = 40 V - 10 V lower voltage rating than MPSW01A. | Not suitable for 24 V bus systems where transient margin is critical; limited to ≤15 V nominal rails. | Select MPSW01 only if system max VCE remains <25 V and cost sensitivity outweighs voltage headroom needs. |
| BC337-40 | hFE = 250–630 (min 250), but IC = 800 mA and PD = 0.625 W - lower current and power capability. | Requires parallel devices or larger heatsinking for 1 A loads; unsuitable for sustained 1000 mA operation. | Choose BC337-40 only for low-power linear amplification where high gain matters more than current capacity. |
Compared with MPSW01 and BC337-40, the MPSW01A uniquely balances 40 V breakdown, 1000 mA current, and 1.0 W ambient-rated power in a standard TO-92 footprint-enabling single-device solutions in 24 V industrial switching where both voltage margin and thermal efficiency are constrained.
Availability
MPSW01A is available at Aetrix Electronics and suitable for relay driver circuits, DC-DC converter feedback networks, and LED load switches requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MPSW01A 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 MPSW01A belongs to onsemi's general-purpose bipolar transistor product line, designed specifically for cost-sensitive, medium-power discrete switching and amplification in industrial control, power supply, and interface applications.
FAQ
What is the maximum collector-emitter voltage rating for the MPSW01A?
The MPSW01A has a guaranteed minimum collector-emitter breakdown voltage V(BR)CEO of 40 Vdc at IC = 10 mA and IB = 0. This rating defines the absolute maximum DC voltage that can be applied between collector and emitter while keeping the base open, and must not be exceeded in circuit design to prevent device failure.
Does the MPSW01A support 1 A continuous collector current in real-world PCB layouts?
Yes, the MPSW01A is rated for IC = 1000 mAdc continuous under specified thermal conditions. Achieving this requires mounting on a PCB with adequate copper area to maintain TA ≤ 25°C or using case temperature derating (PD = 2.5 W at TC = 25°C), as confirmed in the onsemi MPSW01/D datasheet Rev. 6.
Is the MPSW01A pin-compatible with the MPSW01?
Yes, the MPSW01A shares identical TO-92 package dimensions, pinout (Emitter-Base-Collector on pins 1-2-3), and mechanical markings with the MPSW01. However, it is not a drop-in replacement in all designs due to its higher VCEO and VCBO ratings-circuits relying on the lower breakdown of MPSW01 may behave differently under overvoltage stress.
What is the typical base-emitter on voltage for the MPSW01A at full load?
The MPSW01A exhibits VBE(on) ≤ 1.2 Vdc at IC = 1000 mAdc and VCE = 1.0 Vdc, as specified in the onsemi MPSW01/D datasheet. This value determines required base drive voltage headroom and influences base resistor selection in saturated-switching configurations.
How does the thermal resistance of the MPSW01A affect PCB layout decisions?
The MPSW01A has RJA = 125 °C/W, meaning junction temperature rises 125 °C per watt dissipated without added copper. To sustain 1.0 W at TJ ≤ 125 °C with TA = 50 °C, ≥1.5 cm² of 2-oz copper pour is recommended-verified by onsemi's thermal characterization in the MPSW01/D datasheet Figure 7.
MPSW01A 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):
- 1 A
- Voltage - Collector Emitter Breakdown (Max):
- 40 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 100mA, 1A
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 60 @ 100mA, 1V
- Power - Max:
- 1 W
- Frequency - Transition:
- 50MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92 (TO-226)
MPSW01A FAQ
1.How can I place an order for MPSW01A through Aetrix?
Please submit a Request for Quotation (RFQ) for MPSW01A 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 MPSW01A reliable?
The price and inventory of MPSW01A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPSW01A is usually 5 days.
3.What payment methods are accepted for MPSW01A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPSW01A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPSW01A?
MPSW01A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPSW01A 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 MPSW01A?
For technical support, including MPSW01A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPSW01A requirements.
6.How does Aetrix verify that MPSW01A is sourced from the original manufacturer or authorized distributors?
All MPSW01A 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 MPSW01A meets industry standards.
7.What is the process for return or replacement of MPSW01A?
All MPSW01A units undergo pre-shipment inspection (PSI). If there is an issue with MPSW01A, 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 MPSW01A part is unused and in its original packaging.
Return procedure for MPSW01A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MPSW01A Tags
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