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onsemi MPSW42RLRA
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- Part No.:
- MPSW42RLRA
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- -
- Datasheet:
-
MPSW42RLRA.pdf
- Description:
- TRANS NPN SS 1W 300V TO92
- Quantity:
- Payment:
- Shipping:
Inventory:8,835
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Product details
Overview
MPSW42RLRA from onsemi is an NPN silicon high-voltage transistor rated for 300 VCEO, 500 mA continuous collector current, and 1.0 W dissipation at TA = 25°C, used in flyback snubber circuits, relay drivers, and HV switching power supplies.
For engineers reviewing the MPSW42RLRA datasheet, pinout, applications, or equivalent options, key selection factors include its 300 V breakdown rating, TO-92 package thermal resistance (RJA = 125 °C/W), DC current gain (hFE ≥ 25 at IC = 1 mA), and saturation voltage (VCE(sat) ≤ 0.5 V at IC/IB = 10).
Technical Context
This discrete NPN bipolar junction transistor operates in linear or saturated switching mode with a minimum fT of 50 MHz, enabling use in medium-frequency HV amplification and pulse switching. Its V(BR)CEO and V(BR)CBO are both rated at 300 Vdc, confirming symmetrical high-voltage blocking capability across collector-emitter and collector-base junctions.
Thermal design is constrained by RJA = 125 °C/W and RJC = 50 °C/W, requiring careful PCB copper area planning for ambient-limited 1 W operation. Cutoff currents (ICBO, IEBO) remain ≤ 0.1 A under maximum reverse bias, supporting stable off-state isolation in HV hold applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 300 Vdc - supports primary-side switching in offline 230 VAC-derived supplies without derating |
| IC (continuous) | 500 mAdc - sufficient for driving small relays or low-power HV loads |
| PD @ TA = 25°C | 1.0 W - requires ≥ 1.5 cm² 2-oz copper pad for full-rated ambient operation |
| hFE | 25–40 - enables direct TTL/CMOS base drive with ~2 mA IB for 50 mA IC |
| VCE(sat) | ≤ 0.5 V @ IC = 20 mAdc, IB = 2.0 mAdc - limits conduction loss to <10 mW in saturated switch mode |
| fT | ≥ 50 MHz - allows stable operation up to ~5–10 MHz switching in resonant or Class-E topologies |
Pinout & Package
Package: TO-92 (Case 29-10), 1 W power rating, straight-lead configuration per marking diagram. Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Emitter | Reference node for base drive; connects to ground or low-side return path in common-emitter switches |
| 2 | Base | Current-controlled input; requires series resistor to limit IB when driven from logic or op-amp outputs |
| 3 | Collector | High-voltage output node; handles up to 300 Vdc with controlled dV/dt during turn-off |
Key Features
| Feature | Design Value |
|---|---|
| High VCEO / VCBO | 300 V rating enables direct replacement of older 2N6027/2N6028 in HV pulse generators |
| Low VCE(sat) | ≤ 0.5 V reduces power loss and self-heating in repetitive on/off cycling |
| Wide TJ range | −55°C to +150°C operation supports industrial and automotive under-hood environments |
| Pb-free option | MPSW42RLRAG variant available with RoHS-compliant lead finish and tape-and-reel packaging |
Applications
| Switch-Mode Power Supply Snubber | Electromechanical Relay Driver |
|---|---|
Use Scenario: Absorbs voltage spikes across transformer primary windings during MOSFET/FET turn-off in flyback converters. IC Role / Device Role / Timing Role: Discrete HV clamp transistor operating in avalanche-safe linear region. Use Value: Prevents overvoltage failure of primary-side switches using its 300 V VCEO and 1 W dissipation capability. |
Use Scenario: Drives 12–24 VDC coil of industrial control relays from microcontroller GPIO pins. IC Role / Device Role / Timing Role: Medium-current NPN switch with forced β ≥ 10 for reliable saturation. Use Value: Delivers 500 mA peak coil current with <0.5 V drop, minimizing heat rise and ensuring fast de-energization. |
| High-Voltage Pulse Generator | Line-Voltage AC Detection Circuit |
Use Scenario: Generates short-duration HV pulses for CRT deflection, piezo actuation, or spark-gap triggering. IC Role / Device Role / Timing Role: Fast-switching NPN with fT ≥ 50 MHz and low Ccb (≤3.0 pF). Use Value: Enables clean 100 ns–1 µs pulse edges without excessive ringing due to low junction capacitance. |
Use Scenario: Detects presence of 120/230 VAC mains via resistive divider and zero-crossing sensing. IC Role / Device Role / Timing Role: High-impedance, high-breakdown interface transistor isolating MCU from line voltage. Use Value: Withstands 300 V reverse bias and exhibits <0.1 µA leakage (ICBO), ensuring safe, noise-immune detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN high-voltage switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 2N5551 | VCEO = 160 Vdc, PD = 0.625 W, hFE min = 80 - lower voltage rating, higher gain, lower power | Not suitable for >160 V circuits; better for signal amplification than HV switching | Select only where VCE stress remains <140 V and power dissipation <0.6 W |
| MPSA42 | VCEO = 300 Vdc, PD = 0.625 W, hFE min = 50 - same voltage rating but lower power and higher gain | Acceptable for low-duty-cycle HV switching; insufficient for continuous 1 W loads | Prefer MPSW42RLRA when sustained 1 W dissipation or TO-92 thermal margin is required |
Compared with 2N5551 and MPSA42, the MPSW42RLRA delivers superior thermal performance (1.0 W vs. ≤0.625 W) in the same TO-92 footprint while maintaining identical 300 V breakdown, making it the optimal choice for thermally constrained HV switch designs.
Availability
MPSW42RLRA is available at Aetrix Electronics and suitable for flyback snubber circuits, relay driver stages, and HV pulse generator outputs requiring stable component supply, long-term obsolescence management, and RoHS-compliant sourcing.
Supply support for MPSW42RLRA 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, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MPSW42RLRA belongs to onsemi's legacy high-voltage bipolar transistor family, designed specifically for cost-sensitive, reliability-critical HV switching in power conversion and industrial control systems.
FAQ
What is the maximum continuous collector current for MPSW42RLRA?
The MPSW42RLRA supports a maximum continuous collector current of 500 mAdc at TA = 25°C. Derating is required above 25°C at 8.0 mW/°C. This rating ensures reliable operation in relay drivers and snubber circuits where peak current does not exceed 500 mA under steady-state conditions. The MPSW42RLRA must be mounted on adequate copper area to maintain junction temperature within −55°C to +150°C limits.
Is MPSW42RLRA pin-compatible with MPSA42?
No, MPSW42RLRA is not pin-compatible with MPSA42. While both are TO-92 packaged NPN transistors, the MPSW42RLRA uses Style 2 pinout (Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector), whereas MPSA42 uses Style 17 (Pin 1 = Collector, Pin 2 = Base, Pin 3 = Emitter). Swapping them without board revision will result in incorrect biasing and potential device failure. Always verify pinout diagrams before substitution.
Does MPSW42RLRA support Pb-free assembly processes?
Yes, the MPSW42RLRA is offered in a standard leaded version, and its Pb-free counterpart is the MPSW42RLRAG - identical in electrical and thermal specifications, with RoHS-compliant termination and tape-and-reel packaging (2000 units/reel). Both variants share the same TO-92 mechanical outline and marking format, differing only in plating composition and compliance labeling.
What is the typical DC current gain (hFE) of MPSW42RLRA at low current?
The MPSW42RLRA exhibits a minimum hFE of 25 at IC = 1.0 mAdc and VCE = 10 Vdc. At higher currents (IC = 10 mAdc), hFE rises to ≥40. This gain profile supports direct digital logic drive with modest base current, and the MPSW42RLRA maintains usable gain down to −55°C, as confirmed in Figure 3 of the official datasheet.
Can MPSW42RLRA be used in avalanche mode?
The MPSW42RLRA is not characterized or rated for intentional avalanche operation. Its absolute maximum ratings specify VCEO = 300 Vdc with IC = 1.0 mAdc - a test condition, not an avalanche energy rating. For reliable snubber or clamping use, operate the MPSW42RLRA within its SOA (Safe Operating Area) boundaries defined in the datasheet, avoiding unclamped inductive turn-off. Use dedicated avalanche-rated devices for energy-absorbing applications.
MPSW42RLRA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- *
- Package/Case:
- -
- Packaging:
- Cut Tape (CT)
- Product Status:
- Obsolete
- Transistor Type:
- -
- Current - Collector (Ic) (Max):
- -
- Voltage - Collector Emitter Breakdown (Max):
- -
- Vce Saturation (Max) @ Ib, Ic:
- -
- Current - Collector Cutoff (Max):
- -
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- -
- Power - Max:
- -
- Frequency - Transition:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MPSW42RLRA FAQ
1.How can I place an order for MPSW42RLRA through Aetrix?
Please submit a Request for Quotation (RFQ) for MPSW42RLRA 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 MPSW42RLRA reliable?
The price and inventory of MPSW42RLRA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPSW42RLRA is usually 5 days.
3.What payment methods are accepted for MPSW42RLRA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPSW42RLRA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPSW42RLRA?
MPSW42RLRA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPSW42RLRA 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 MPSW42RLRA?
For technical support, including MPSW42RLRA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPSW42RLRA requirements.
6.How does Aetrix verify that MPSW42RLRA is sourced from the original manufacturer or authorized distributors?
All MPSW42RLRA 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 MPSW42RLRA meets industry standards.
7.What is the process for return or replacement of MPSW42RLRA?
All MPSW42RLRA units undergo pre-shipment inspection (PSI). If there is an issue with MPSW42RLRA, 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 MPSW42RLRA part is unused and in its original packaging.
Return procedure for MPSW42RLRA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MPSW42RLRA Tags
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