My Inquiry
My Account
onsemi MPSW51A
,TO-226_bentlead.jpg)
- Part No.:
- MPSW51A
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 Long Body
- Datasheet:
-
MPSW51A.pdf
- Description:
- TRANS PNP 40V 1A TO92
- Quantity:
- Payment:
- Shipping:
Inventory:9,848
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MPSW51A from onsemi is a PNP silicon bipolar junction transistor rated for −40 VCEO, −50 VCBO, and −1000 mA continuous collector current, with 2.5 W total dissipation at TC = 25°C. It operates across −55°C to +150°C junction temperature and is used in high-current linear switching and power amplification stages in industrial control and DC-DC converter bias circuits.
For engineers reviewing the MPSW51A datasheet, pinout, applications, or equivalent options, key selection criteria include its −40 VCEO rating, 50 MHz fT, TO-92 package thermal resistance (RJC = 50°C/W), VCE(sat) ≤ −0.7 V at −1000 mA/−100 mA drive, and hFE ≥ 50 at full rated current - all critical for robust high-current PNP switching design.
Technical Context
The MPSW51A is a discrete PNP BJT optimized for medium-power linear and saturated switching applications. Its design emphasizes high current handling (−1000 mA IC) with low saturation voltage (VCE(sat) ≤ −0.7 V) and stable gain (hFE ≥ 50 at −1000 mA) under heavy load conditions.
Thermal performance is defined by RJC = 50°C/W and RJA = 125°C/W, enabling reliable operation up to +150°C junction temperature. Its 50 MHz fT supports moderate-frequency amplification, while Cobo = 30 pF limits high-frequency parasitic coupling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −40 Vdc: Maximum safe collector-emitter voltage before breakdown in open-base configuration. |
| IC | −1000 mAdc: Continuous DC collector current capability without thermal runaway at TC = 25°C. |
| PD @ TC = 25°C | 2.5 W: Total power dissipation limit when case temperature is maintained at 25°C. |
| fT | 50 MHz: Current-gain bandwidth product defining usable small-signal amplification range. |
| VCE(sat) | ≤ −0.7 Vdc at IC = −1000 mAdc, IB = −100 mAdc: Low saturation voltage enables efficient switching with minimal conduction loss. |
| RJC | 50 °C/W: Thermal resistance from junction to case - critical for heatsink sizing in power applications. |
| hFE | ≥ 50 at IC = −1000 mAdc, VCE = −1.0 Vdc: Minimum DC current gain ensures predictable base drive requirements. |
Pinout & Package
Package: TO-92 (Case 29-10, Style 1), 1 WATT, Pb-free, through-hole mounting. Pin assignment confirmed per official mechanical outline: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Emitter | Current exit terminal for PNP operation; connects to most positive rail in common-emitter switch configurations. |
| 2 | Base | Control terminal; requires negative current relative to emitter to turn on device (IB < 0). |
| 3 | Collector | Current entry terminal; connects to load or supply return path in high-side switching topologies. |
Key Features
| Feature | Design Value |
|---|---|
| High current capability | Rated for −1000 mAdc continuous, supporting robust load switching without external current sharing. |
| Low VCE(sat) | ≤ −0.7 V at full rated current reduces conduction losses and improves efficiency in saturated-switching designs. |
| Wide operating temperature | −55°C to +150°C junction range enables use in automotive under-hood and industrial motor-control environments. |
| Pb-free & RoHS compliant | Meets global environmental regulations; compatible with standard lead-free reflow and wave soldering processes. |
| TO-92 mechanical standardization | Industry-standard footprint simplifies board layout, replacement, and compatibility with legacy PNP transistor footprints. |
Applications
| Industrial Motor Control | DC-DC Converter Bias Circuit |
|---|---|
|
Use Scenario: Driving gate resistors or optocoupler LEDs in isolated half-bridge driver stages of 24–48 V industrial motor controllers. IC Role / Device Role / Timing Role: High-current PNP switch providing fast, low-loss turn-on of bootstrap or level-shift circuitry. Use Value: −40 VCEO withstands transient spikes in 48 V systems; −0.7 VCE(sat) minimizes heat generation during frequent switching cycles. |
Use Scenario: Supplying regulated bias current to error amplifier or PWM controller ICs in flyback and forward converters. IC Role / Device Role / Timing Role: Linear current source/sink delivering stable reference current independent of input ripple. Use Value: hFE ≥ 50 at −1000 mA ensures precise current mirroring; 150°C max TJ supports operation near hot transformer cores. |
| Linear Regulator Pass Element | Overcurrent Protection Switch |
|
Use Scenario: Acting as series pass transistor in adjustable 3–12 V linear regulators delivering up to 800 mA output. IC Role / Device Role / Timing Role: Voltage-controlled current valve regulating output via feedback loop to base. Use Value: RJC = 50°C/W allows direct mounting to small heatsinks; −50 VCBO provides margin against input transients. |
Use Scenario: Implementing foldback current limiting in battery charger or lab power supply output stages. IC Role / Device Role / Timing Role: Fast-acting shunt or series cutoff switch triggered by sense resistor voltage. Use Value: 50 MHz fT supports sub-microsecond response to overcurrent events; TO-92 form factor enables compact PCB placement near sense node. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP high-current transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPSW51 | VCEO = −30 V, VCBO = −40 V, lower voltage ratings than MPSW51A. | Suitable only for ≤30 V systems; not recommended where 40 V transient immunity is required. | Select MPSW51 only if system maximum bus voltage remains below 25 V with margin. |
| PN2907A | Lower IC = −600 mA, VCEO = −60 V, but hFE drops to ≥30 at full current. | Acceptable for lower-current bias or logic-level switching, but insufficient for 1 A loads. | Choose PN2907A only when load current stays below 600 mA and higher VCEO margin is prioritized over current capacity. |
Compared with MPSW51 and PN2907A, the MPSW51A uniquely balances −40 VCEO, −1000 mA IC, and hFE ≥ 50 at full current - making it the only option among the three qualified for sustained 1 A switching in 36–48 V industrial power rails.
Availability
MPSW51A is available at Aetrix Electronics and suitable for industrial motor control, DC-DC converter bias circuits, and linear regulator pass element applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MPSW51A 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 MPSW51A belongs to onsemi's general-purpose bipolar transistor product line, designed specifically for cost-sensitive, high-reliability medium-power switching and amplification in industrial and power-conversion equipment.
FAQ
What is the maximum continuous collector current rating for the MPSW51A?
The MPSW51A is rated for −1000 mAdc continuous collector current at TC = 25°C. Derating applies above 25°C case temperature, with a thermal resistance of 50°C/W from junction to case. At TC = 75°C, the usable IC drops to approximately −750 mAdc based on linear derating. This rating is validated per the official onsemi datasheet revision 5.
Does the MPSW51A have a guaranteed minimum DC current gain at full rated current?
Yes, the MPSW51A guarantees hFE ≥ 50 at IC = −1000 mAdc, VCE = −1.0 Vdc, and TA = 25°C. This specification ensures predictable base drive requirements in saturated-switching applications and is measured and verified per the onsemi electrical characteristics table.
What is the pin configuration of the MPSW51A in its TO-92 package?
The MPSW51A uses TO-92 package Style 1: Pin 1 is Emitter, Pin 2 is Base, and Pin 3 is Collector. This configuration is explicitly documented in the "MECHANICAL CASE OUTLINE" section of the official datasheet (page 3, Style 1). The device is not pin-compatible with Style 2 or Style 17 variants.
Is the MPSW51A RoHS compliant and lead-free?
Yes, the MPSW51A is Pb-free and RoHS compliant, as confirmed in the "Features" section of the onsemi datasheet (Rev. 5, June 2013). The "G" suffix in ordering codes (e.g., MPSW51ARLRAG) and the "Pb-Free Package" notation in the Ordering Information table verify compliance with EU RoHS Directive 2011/65/EU.
What is the typical transition frequency (fT) of the MPSW51A and under what conditions is it specified?
The MPSW51A has a minimum fT of 50 MHz, specified at IC = −50 mAdc, VCE = −10 Vdc, and f = 20 MHz. This value reflects its usable small-signal amplification bandwidth and is measured per the "ELECTRICAL CHARACTERISTICS" table on page 2 of the official datasheet.
MPSW51A 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):
- 40 V
- Vce Saturation (Max) @ Ib, Ic:
- 700mV @ 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)
MPSW51A FAQ
1.How can I place an order for MPSW51A through Aetrix?
Please submit a Request for Quotation (RFQ) for MPSW51A 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 MPSW51A reliable?
The price and inventory of MPSW51A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPSW51A is usually 5 days.
3.What payment methods are accepted for MPSW51A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPSW51A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPSW51A?
MPSW51A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPSW51A 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 MPSW51A?
For technical support, including MPSW51A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPSW51A requirements.
6.How does Aetrix verify that MPSW51A is sourced from the original manufacturer or authorized distributors?
All MPSW51A 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 MPSW51A meets industry standards.
7.What is the process for return or replacement of MPSW51A?
All MPSW51A units undergo pre-shipment inspection (PSI). If there is an issue with MPSW51A, 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 MPSW51A part is unused and in its original packaging.
Return procedure for MPSW51A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MPSW51A Tags
-
MMBT3906LT1G
onsemi
-
MMBT3904-7-F
Diodes Incorporated
-
MMBT3904LT1G
onsemi
-
MMBT3906-7-F
Diodes Incorporated
-
MMBT3904-TP
Micro Commercial Co
-
MMBT2222A-7-F
Diodes Incorporated
-
BC846BLT1G
onsemi
-
BC847B,215
Nexperia USA Inc.
-
SMMBT3904LT1G
onsemi
-
MMBT2222A-TP
Micro Commercial Co
-
MMBTA06LT1G
onsemi
-
MMBT2222ALT1G
onsemi
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
