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onsemi MPSW51
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- Part No.:
- MPSW51
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 Long Body
- Datasheet:
-
MPSW51.pdf
- Description:
- TRANS PNP 30V 1A TO92
- Quantity:
- Payment:
- Shipping:
Inventory:56,690
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Product details
Overview
MPSW51 from onsemi is a PNP silicon bipolar junction transistor rated for −30 VCEO, −1000 mA continuous collector current, and 1.0 W total device dissipation at TA = 25°C in TO-92 package; it delivers hFE ≥ 55 at −10 mA, VCE(sat) ≤ −0.7 V at −1000 mA/−100 mA drive, and fT ≥ 50 MHz - used in high-current linear regulators and relay drivers.
For engineers reviewing the MPSW51 datasheet, pinout, applications, or equivalent options, key selection criteria include verified PNP polarity, TO-92 mechanical compatibility, −30 V breakdown margin, DC gain stability across −10 to −1000 mA, and thermal resistance of 125°C/W junction-to-ambient.
Technical Context
The MPSW51 operates as a medium-power PNP BJT with fixed emitter-base and collector-base junction structures optimized for linear and switching operation up to 50 MHz. Its safe operating area (SOA) is defined by thermal limit (1.0 W @ 25°C), second breakdown limit, and current limit curves - all validated under pulsed conditions (300 µs, 2% duty cycle).
It features a base-emitter on voltage of ≤ −1.2 V at −1000 mA collector current and −1.0 V VCE, and exhibits Cobo ≤ 30 pF at −10 V reverse bias - supporting stable performance in low-noise amplifier stages and fast-switching load control circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −30 Vdc - maximum allowable collector-emitter voltage before breakdown in open-base configuration |
| IC | −1000 mAdc - continuous DC collector current rating defining maximum load-handling capability |
| PD @ TA | 1.0 W - power dissipation limit at ambient temperature, derating 8.0 mW/°C above 25°C |
| hFE | ≥ 55 - minimum DC current gain at −10 mA IC, −1.0 V VCE, enabling reliable base drive sizing |
| fT | ≥ 50 MHz - unity-gain frequency confirming usable bandwidth for audio-frequency amplification and switching |
| RJA | 125 °C/W - junction-to-ambient thermal resistance determining heatsink requirements in free-air mounting |
Pinout & Package
Package: TO-92 (Case 29-10, Style 1), 1 W rating, Pb-free, through-hole mounting with bent or straight leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Emitter | Current exit terminal for PNP operation; connects to most positive rail in common-emitter configurations |
| 2 | Base | Control electrode; negative input relative to emitter to forward-bias base-emitter junction and enable conduction |
| 3 | Collector | Current entry terminal; ties to load or lower-potential node in standard switching or amplification topologies |
Key Features
| Feature | Design Value |
|---|---|
| PNP silicon BJT architecture | Enables sourcing current from positive supply in high-side switch and linear regulator applications |
| −30 V VCEO rating | Supports operation in 24 V industrial control systems with safety margin against transients |
| VCE(sat) ≤ −0.7 V @ −1000 mA | Minimizes conduction loss and self-heating in high-current switching nodes |
| fT ≥ 50 MHz | Permits use in wideband audio preamplifiers and fast-response feedback loops |
| RoHS-compliant Pb-free packaging | Meets global environmental compliance requirements without solderability compromise |
Applications
| Industrial Relay Driver | Linear Voltage Regulator Pass Element |
|---|---|
Use Scenario: Driving 24 VDC coil relays with 50–100 mA hold current in PLC output modules. IC Role / Device Role / Timing Role: High-current PNP switch sinking relay coil current to ground while sourcing from 24 V rail. Use Value: −1000 mA IC rating and −0.7 V VCE(sat) ensure minimal dropout and thermal rise during sustained actuation. |
Use Scenario: Pass transistor in adjustable 3–15 V linear regulators delivering up to 800 mA load current. IC Role / Device Role / Timing Role: Series pass element controlled by error amplifier to regulate output voltage. Use Value: Stable hFE ≥ 55 across operating range enables predictable loop gain and transient response. |
| Audio Power Amplifier Stage | High-Current LED Driver |
Use Scenario: Complementary Class-B output stage in 1–2 W audio amplifiers for speaker drive. IC Role / Device Role / Timing Role: PNP half of push-pull pair delivering negative half-cycle current to load. Use Value: 50 MHz fT and low Cobo (≤30 pF) preserve signal fidelity up to 20 kHz with minimal phase shift. |
Use Scenario: Constant-current source for high-brightness LED strings in signage and automotive lighting. IC Role / Device Role / Timing Role: Current-regulating series element with sense resistor feedback. Use Value: −30 V VCEO accommodates multi-LED forward voltage stacks while maintaining SOA integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP bipolar transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPSW51A | Higher −40 V VCEO and −50 V VCBO; otherwise identical pinout, package, and gain/bandwidth specs | Preferred where system transients exceed −30 V or higher collector-base isolation is required | Select MPSW51A when design requires extended voltage margin without layout change |
| BC557B | Lower −45 V VCEO but only −100 mA IC rating and 500 mW PD; TO-92, same pinout (E-B-C) | Suitable for low-power signal switching only - not interchangeable for >200 mA loads | Choose BC557B only for sub-100 mA biasing or logic-level interface tasks |
Compared with MPSW51, the MPSW51A offers higher voltage robustness without altering footprint or drive requirements, while the BC557B serves lower-current roles and cannot replace MPSW51 in high-load applications due to its 90% lower current rating and 50% lower power dissipation.
Availability
MPSW51 is available at Aetrix Electronics and suitable for industrial relay drivers, linear voltage regulator pass elements, audio amplifier output stages, and high-current LED drivers requiring stable component supply and long-term manufacturability.
Supply support for MPSW51 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 manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MPSW51 belongs to onsemi's general-purpose bipolar transistor product line, designed for cost-sensitive, medium-power linear and switching applications demanding reliability, thermal stability, and RoHS compliance in TO-92 packages.
FAQ
What is the maximum continuous collector current rating for the MPSW51?
The MPSW51 has a maximum continuous collector current rating of −1000 mAdc at TA = 25°C. This rating assumes proper PCB thermal relief and ambient cooling; derating applies above 25°C per the 8.0 mW/°C specification. The MPSW51 must not be operated beyond this limit in DC or high-duty-cycle pulse applications without verifying SOA compliance.
Is the MPSW51 pin-compatible with the MPSW51A?
Yes, the MPSW51 is pin-compatible with the MPSW51A - both use identical TO-92 (Case 29-10, Style 1) packaging with E-B-C pinout (Emitter=Pin1, Base=Pin2, Collector=Pin3). No PCB layout changes are needed when substituting MPSW51A for MPSW51, though the MPSW51A offers higher −40 V VCEO and −50 V VCBO ratings.
What is the typical DC current gain (hFE) of the MPSW51 at different collector currents?
The MPSW51 provides hFE ≥ 55 at −10 mAdc, ≥ 60 at −100 mAdc, and ≥ 50 at −1000 mAdc - all measured at VCE = −1.0 Vdc and TA = 25°C. This gain profile supports consistent base drive design across light and heavy load conditions, with peak gain near mid-range currents.
Does the MPSW51 meet RoHS requirements?
Yes, the MPSW51 is Pb-free and RoHS compliant, as confirmed in the official onsemi datasheet (Rev. 5, June 2013) and ordering information. The "G" suffix in part numbers like MPSW51RLRAG explicitly denotes Pb-free packaging, and the device meets EU Directive 2011/65/EU requirements without exemptions.
What is the thermal resistance from junction to case (RJC) for the MPSW51?
The MPSW51 has a thermal resistance of RJC = 50°C/W from junction to case, measured under TC = 25°C conditions. This value enables direct heatsinking via the collector lead in high-power applications, complementing the 125°C/W RJA for ambient-only cooling scenarios.
MPSW51 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:
- PNP
- Current - Collector (Ic) (Max):
- 1 A
- Voltage - Collector Emitter Breakdown (Max):
- 30 V
- Vce Saturation (Max) @ Ib, Ic:
- 700mV @ 100mA, 1A
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 160 @ 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)
MPSW51 FAQ
1.How can I place an order for MPSW51 through Aetrix?
Please submit a Request for Quotation (RFQ) for MPSW51 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 MPSW51 reliable?
The price and inventory of MPSW51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPSW51 is usually 5 days.
3.What payment methods are accepted for MPSW51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPSW51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPSW51?
MPSW51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPSW51 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 MPSW51?
For technical support, including MPSW51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPSW51 requirements.
6.How does Aetrix verify that MPSW51 is sourced from the original manufacturer or authorized distributors?
All MPSW51 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 MPSW51 meets industry standards.
7.What is the process for return or replacement of MPSW51?
All MPSW51 units undergo pre-shipment inspection (PSI). If there is an issue with MPSW51, 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 MPSW51 part is unused and in its original packaging.
Return procedure for MPSW51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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