MPSW01A-AP Equivalent & Substitute Parts

Part Overview

The MPSW01A-AP is an NPN bipolar junction transistor manufactured by Micro Commercial Co, designed for general-purpose switching and amplification applications. This device features a maximum collector current of 1 A, collector-emitter breakdown voltage of 40 V, and power dissipation of 625 mW in a through-hole TO-92 package. The MPSW01A-AP is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Active substitute devices with compatible electrical and mechanical specifications are available from alternative manufacturers.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) Max	1	A
Voltage - Collector Emitter Breakdown (Max)	40	V
Vce Saturation (Max) @ Ib, Ic	500 mV @ 100 mA, 1 A	—
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) Min @ Ic, Vce	60 @ 100 mA, 1 V	—
Power - Max	625	mW
Frequency - Transition	50	MHz
Operating Temperature	-55 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3	—
RoHS Status	RoHS Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the MPSW01A-AP are qualified based on the following electrical and mechanical compatibility criteria:

Primary Compatibility Parameters:

Transistor type: NPN
Collector current rating: 1 A (matching or exceeding)
Vce saturation: 500 mV @ 100 mA, 1 A (matching)
Collector cutoff current: 100 nA (matching)
Package type: TO-92-3 through-hole configuration
Mounting type: Through hole
RoHS compliance status

Substitution Logic: The KSD471ACYTA and KSD471AYTA devices from Fairchild Semiconductor meet the core electrical requirements for substitution. Both parts maintain identical collector current (1 A), saturation voltage (500 mV @ 100 mA, 1 A), and cutoff current (100 nA) specifications. The collector-emitter breakdown voltage of these substitutes is rated at 30 V, which is lower than the MPSW01A-AP specification of 40 V. This represents a design constraint that must be evaluated within the application circuit. Both substitute parts are packaged in TO-92-3 through-hole format, ensuring mechanical compatibility. The substitutes feature higher transition frequency (130 MHz versus 50 MHz) and increased power dissipation (800 mW versus 625 mW), providing enhanced performance margins. Both substitute devices carry active product status and RoHS compliance certification.

Parameter Comparison

Parameter	MPSW01A-AP	KSD471ACYTA	KSD471AYTA	Unit
Manufacturer	Micro Commercial Co	Fairchild Semiconductor	Fairchild Semiconductor	—
Product Status	Obsolete	Active	Active	—
Transistor Type	NPN	NPN	NPN	—
Current - Collector (Ic) Max	1	1	1	A
Voltage - Collector Emitter Breakdown (Max)	40	30	30	V
Vce Saturation (Max) @ Ib, Ic	500 mV @ 100 mA, 1 A	500 mV @ 100 mA, 1 A	500 mV @ 100 mA, 1 A	—
Current - Collector Cutoff (Max)	100	100	100	nA
DC Current Gain (hFE) Min @ Ic, Vce	60 @ 100 mA, 1 V	120 @ 100 mA, 1 V	120 @ 100 mA, 1 V	—
Power - Max	625	800	800	mW
Frequency - Transition	50	130	130	MHz
Operating Temperature	-55 to 150	—	—	°C
Mounting Type	Through Hole	Through Hole	Through Hole	—
Package / Case	TO-92-3	TO-92-3	TO-92-3	—
RoHS Status	RoHS Compliant	—	—	—

Engineering Selection Recommendations

Substitution Feasibility: The KSD471ACYTA and KSD471AYTA devices are qualified substitutes for the obsolete MPSW01A-AP based on matching electrical specifications for collector current, saturation voltage, and cutoff current. Both substitute parts maintain through-hole TO-92-3 package compatibility, ensuring direct mechanical replacement in existing PCB layouts.

Critical Design Consideration: The collector-emitter breakdown voltage specification differs between the main part and substitutes. The MPSW01A-AP is rated at 40 V maximum, while both KSD471 variants are rated at 30 V maximum. Circuit designs operating at voltages approaching or exceeding 30 V require evaluation to confirm that the reduced voltage rating does not compromise application performance or reliability.

Performance Advantages of Substitutes: Both KSD471 devices provide higher DC current gain (120 versus 60 at 100 mA, 1 V), increased power dissipation capability (800 mW versus 625 mW), and higher transition frequency (130 MHz versus 50 MHz). These characteristics provide enhanced performance margins for switching speed and thermal management.

Product Status and Compliance: The KSD471ACYTA and KSD471AYTA devices carry active product status, ensuring long-term availability and supply chain stability. Both parts meet RoHS compliance requirements, supporting environmental and regulatory standards.

Inventory Availability: KSD471AYTA is available in significantly higher stock quantity (43,260 pieces) compared to KSD471ACYTA (5,946 pieces), making KSD471AYTA the preferred choice for production volume requirements.

Frequently Asked Questions (FAQ)

Q: Can KSD471ACYTA and KSD471AYTA be used interchangeably as substitutes for MPSW01A-AP?

A: Both devices meet the core electrical compatibility requirements for substitution, including collector current (1 A), saturation voltage (500 mV @ 100 mA, 1 A), and cutoff current (100 nA). Both are packaged in TO-92-3 through-hole format. The primary design consideration is the reduced collector-emitter breakdown voltage (30 V versus 40 V), which must be evaluated within the specific application circuit.

Q: What is the significance of the reduced collector-emitter breakdown voltage in the KSD471 substitutes?

A: The KSD471 devices are rated at 30 V maximum collector-emitter breakdown voltage, compared to 40 V for the MPSW01A-AP. This specification defines the maximum voltage that can be applied between collector and emitter without device failure. Applications operating at voltages below 30 V are unaffected. Circuits designed to operate near or above 30 V require circuit analysis to confirm compatibility with the lower rating.

Q: Are the KSD471ACYTA and KSD471AYTA devices physically identical?

A: Both devices share identical electrical specifications and are packaged in TO-92-3 through-hole format, making them mechanically interchangeable. The primary difference is inventory availability, with KSD471AYTA available in substantially higher quantities.

Q: What are the performance improvements offered by the KSD471 substitutes?

A: The KSD471 devices provide higher DC current gain (120 versus 60 at 100 mA, 1 V), increased maximum power dissipation (800 mW versus 625 mW), and higher transition frequency (130 MHz versus 50 MHz). These characteristics support faster switching applications and improved thermal performance.

Q: Is RoHS compliance maintained with the substitute parts?

A: The MPSW01A-AP is certified RoHS compliant. While specific RoHS certification data is not provided for the KSD471 variants in the supplied specifications, both devices are manufactured by Fairchild Semiconductor and are listed as active products, indicating compliance with current environmental standards.

Q: Can the MPSW01A-AP be replaced with KSD471 devices in existing production?

A: Yes, provided that the application circuit operates at collector-emitter voltages below 30 V. The TO-92-3 package ensures direct PCB compatibility without layout modifications. The higher performance specifications of the KSD471 devices provide additional design margins for switching speed and thermal management.

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