My Inquiry
My Account
onsemi MPSW01AG
,TO-226_bentlead.jpg)
- Part No.:
- MPSW01AG
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 Long Body
- Datasheet:
-
MPSW01AG.pdf
- Description:
- TRANS NPN 40V 1A TO92
- Quantity:
- Payment:
- Shipping:
Inventory:2,796
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MPSW01AG from onsemi is an NPN silicon general-purpose switching transistor in TO-92 package, rated for 40 VCEO, 1 A continuous collector current, and 1.0 W dissipation at TA = 25°C. It delivers hFE ≥ 60 at IC = 100 mA, VCE = 1.0 V, and VCE(sat) ≤ 0.5 V at IC = 1000 mA / IB = 100 mA - used in DC-DC converter base drive and relay interface circuits.
For engineers reviewing the MPSW01AG datasheet, pinout, applications, or equivalent options, key selection criteria include its 40 VCEO rating, 1 A IC capability, Pb-free TO-92 packaging, guaranteed hFE minimum at high current, and thermal resistance of 125°C/W (junction-to-ambient).
Technical Context
This discrete NPN bipolar junction transistor operates in saturation or active mode for medium-power linear and switching applications. Its design supports DC gain stability across IC = 10–1000 mA with VCE = 1.0 V bias, and exhibits fT = 50 MHz for small-signal amplification up to mid-VHF range.
Thermal performance is defined by RJA = 125°C/W and RJC = 50°C/W, enabling operation from −55°C to +150°C junction temperature. The device uses standard epoxy-molded TO-92 case (Case 29-10, Style 1) with bent leads and Pb-free finish per J-STD-609.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 40 Vdc - maximum safe collector-emitter voltage before breakdown under open-base condition. |
| IC (continuous) | 1000 mAdc - sustained collector current capacity without exceeding thermal limits at TA = 25°C. |
| PD @ TA = 25°C | 1.0 W - total power dissipation limit with free-air convection cooling; derates 8 mW/°C above 25°C. |
| hFE (min) | 60 - guaranteed DC current gain at IC = 100 mAdc, VCE = 1.0 Vdc, ensuring reliable base drive sizing. |
| VCE(sat) | ≤ 0.5 Vdc - low saturation voltage at IC = 1000 mAdc / IB = 100 mAdc, minimizing conduction loss in switch mode. |
| fT | 50 MHz - unity-gain frequency at IC = 50 mAdc, VCE = 10 Vdc, supporting RF amplifier or oscillator use. |
Pinout & Package
Package: TO-92 (Case 29-10, Style 1), epoxy-molded, Pb-free, through-hole mounting with bent leads. Dimensions comply with JEDEC TO-226 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Emitter | Current exit terminal; connected to ground or low-side return path in common-emitter configurations. |
| 2 | Base | Control input; requires ~100 mA drive to saturate at 1 A collector load, enabling logic-level interfacing. |
| 3 | Collector | Current entry terminal; handles up to 40 V and 1 A, suitable for driving relays, LEDs, or MOSFET gates. |
Key Features
| Feature | Design Value |
|---|---|
| High current capability | 1000 mAdc continuous collector current enables direct drive of 12 V relays and solenoids without external buffers. |
| Guaranteed gain at high current | hFE ≥ 60 at IC = 100 mAdc ensures stable switching margins even as current increases across operating range. |
| Low saturation voltage | VCE(sat) ≤ 0.5 V reduces power loss to ≤500 mW at full load, improving thermal efficiency in compact layouts. |
| Pb-free TO-92 package | RoHS-compliant construction with standardized footprint simplifies PCB assembly and meets global environmental directives. |
Applications
| Power Supply Sequencing | Industrial Relay Driver |
|---|---|
|
Use Scenario: Enabling 5 V logic-controlled activation of 24 V industrial relays in PLC I/O modules. IC Role / Device Role / Timing Role: NPN switch providing current gain to translate microcontroller GPIO output into 1 A coil drive. Use Value: VCEO = 40 V and IC = 1 A ensure margin against back-EMF spikes and sustained coil hold current. |
Use Scenario: Isolating MCU outputs from higher-voltage loads in battery management system precharge circuits. IC Role / Device Role / Timing Role: Discrete BJT acting as gate driver for external N-channel MOSFET controlling precharge resistor path. Use Value: Low VCE(sat) ≤ 0.5 V minimizes voltage drop during precharge, preserving accuracy of voltage monitoring. |
| DC-DC Converter Base Drive | LED Current Switch |
|
Use Scenario: Driving the base of a power PNP transistor in a non-isolated buck regulator feedback loop. IC Role / Device Role / Timing Role: Medium-speed switch (fT = 50 MHz) delivering precise base current pulses synchronized to PWM frequency. Use Value: Stable hFE across 10–1000 mA allows predictable current mirroring and fast turn-on/turn-off transitions. |
Use Scenario: Controlling high-brightness LED strings (up to 1 A) in automotive interior lighting modules. IC Role / Device Role / Timing Role: Constant-current switch regulating LED current via emitter-resistor feedback in common-emitter topology. Use Value: 150°C max junction temperature and 125°C/W RJA support operation in enclosed, thermally constrained enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN switching transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBT4401LT1G | Lower VCEO = 40 V (same), but IC = 600 mA and PD = 310 mW - smaller die, lower thermal mass. | Not suitable for 1 A continuous loads; limited to <600 mA switching or pulsed operation. | Select when board space is constrained and load current remains below 600 mA. |
| BC817-40,215 | VCEO = 45 V, IC = 500 mA, SOT-23 package - surface-mount, no lead bending required. | Requires rework for through-hole replacement; lower power handling limits use in high-duty-cycle applications. | Choose for automated SMT assembly where thermal demand is moderate and layout allows SOT-23 footprint. |
Compared with MMBT4401LT1G and BC817-40,215, the MPSW01AG uniquely supports 1 A continuous collector current in a legacy-compatible TO-92 through-hole package with verified 40 VCEO margin and Pb-free compliance - critical for industrial control upgrades requiring drop-in mechanical fit and proven reliability.
Availability
MPSW01AG is available at Aetrix Electronics and suitable for industrial relay drivers, DC-DC converter base drive stages, and LED current switches requiring stable component supply, long-term manufacturability, and RoHS-compliant through-hole transistors.
Supply support for MPSW01AG 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, sensors, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The MPSW01AG belongs to onsemi's legacy discrete transistor family designed for cost-sensitive, medium-power switching applications where reliability, thermal robustness, and through-hole compatibility remain essential - especially in industrial controls and power conversion.
FAQ
What is the maximum collector-emitter voltage rating for MPSW01AG?
The MPSW01AG has a guaranteed VCEO rating of 40 Vdc under open-base conditions with IC = 10 mA. This rating is confirmed in the Absolute Maximum Ratings table and validated in the OFF CHARACTERISTICS section of the official datasheet. Exceeding this voltage risks avalanche breakdown and permanent device failure. Designers should maintain at least 20% margin (≤32 V) in 24 V systems to accommodate transients.
Does MPSW01AG support 1 A continuous collector current in real-world PCB layouts?
Yes - the MPSW01AG is rated for 1000 mAdc continuous collector current at TA = 25°C with free-air convection. In practice, achieving this requires adequate copper pour (≥1 cm² on both sides), minimal trace length, and ambient temperature ≤40°C. Derating to 700 mA is recommended at 70°C ambient per the 8 mW/°C thermal derating curve shown in the datasheet.
Is MPSW01AG pin-compatible with older MPSW01 variants?
Yes - the MPSW01AG shares identical TO-92 pinout (Emitter-Base-Collector on pins 1-2-3), mechanical dimensions, and electrical specifications with MPSW01 and MPSW01A, except for Pb-free plating. No PCB changes are required when upgrading from MPSW01 or MPSW01A to MPSW01AG, making it a direct drop-in replacement for RoHS compliance.
What is the typical DC current gain (hFE) of MPSW01AG at 100 mA collector current?
The MPSW01AG guarantees hFE ≥ 60 at IC = 100 mAdc, VCE = 1.0 Vdc, and TA = 25°C, per the ELECTRICAL CHARACTERISTICS table. Typical values observed in production lots range from 85 to 120, supporting conservative base resistor design (e.g., 1 kΩ for 5 V logic drive). This gain remains stable across the full 10–1000 mA operating range.
Can MPSW01AG be used in small-signal amplifier applications?
Yes - the MPSW01AG achieves fT = 50 MHz at IC = 50 mAdc, VCE = 10 Vdc, making it suitable for audio-frequency and low-VHF amplifiers (e.g., IF stages up to 20 MHz). However, its primary design focus is switching; for precision analog use, dedicated RF transistors like MMBT918LT1G offer better noise figure and linearity.
MPSW01AG 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)
MPSW01AG FAQ
1.How can I place an order for MPSW01AG through Aetrix?
Please submit a Request for Quotation (RFQ) for MPSW01AG 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 MPSW01AG reliable?
The price and inventory of MPSW01AG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPSW01AG is usually 5 days.
3.What payment methods are accepted for MPSW01AG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPSW01AG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPSW01AG?
MPSW01AG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPSW01AG 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 MPSW01AG?
For technical support, including MPSW01AG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPSW01AG requirements.
6.How does Aetrix verify that MPSW01AG is sourced from the original manufacturer or authorized distributors?
All MPSW01AG 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 MPSW01AG meets industry standards.
7.What is the process for return or replacement of MPSW01AG?
All MPSW01AG units undergo pre-shipment inspection (PSI). If there is an issue with MPSW01AG, 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 MPSW01AG part is unused and in its original packaging.
Return procedure for MPSW01AG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MPSW01AG 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…
