MPSW42RLRAG Equivalent & Substitute Parts

Part Overview

The MPSW42RLRAG is an NPN bipolar junction transistor manufactured by onsemi, rated for 300 V collector-emitter breakdown voltage and 500 mA maximum collector current. This device is packaged in a through-hole TO-92 (TO-226-3) configuration with a maximum power dissipation of 1 W and operates across a temperature range of -55°C to 150°C. The MPSW42RLRAG is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	300	V
Current - Collector (Ic) (Max)	500	mA
Power - Max	1	W
Frequency - Transition	50	MHz
Operating Temperature	-55 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3	—
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 30mA, 10V	—
Vce Saturation (Max) @ Ib, Ic	500mV @ 2mA, 20mA	—

Substitute Part Grouping Explanation

Substitution of the MPSW42RLRAG is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Transistor Type: NPN
Voltage - Collector Emitter Breakdown (Max): 300 V
Current - Collector (Ic) (Max): 500 mA or greater
DC Current Gain (hFE) (Min): 40 or greater at specified test conditions
Vce Saturation (Max): 500 mV or lower at specified test conditions
Frequency - Transition: 50 MHz or greater
Operating Temperature Range: Must encompass or exceed -55°C to 150°C

Secondary Considerations:

Mounting Type: Through Hole (primary) or Surface Mount (alternative form factor)
Package Compatibility: TO-92-3 (primary) or equivalent mechanical footprint
Product Status: Active status preferred for long-term availability

Substitute parts are grouped into two categories: direct through-hole replacements maintaining identical package form factor, and surface-mount alternatives for designs permitting package migration.

Parameter Comparison

Parameter	MPSW42RLRAG	KSP42TA	MMBTA42LT1G	ZTX457STZ	ZTX657STZ	ZTX857STZ
Manufacturer	onsemi	onsemi	onsemi	Diodes Inc.	Diodes Inc.	Diodes Inc.
Transistor Type	NPN	NPN	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	300 V	300 V	300 V	300 V	300 V	300 V
Current - Collector (Ic) (Max)	500 mA	500 mA	500 mA	500 mA	500 mA	3 A
Power - Max	1 W	625 mW	225 mW	1 W	1 W	1.2 W
Frequency - Transition	50 MHz	50 MHz	50 MHz	75 MHz	30 MHz	80 MHz
Operating Temperature (Min)	-55°C	Not specified	-55°C	-55°C	-55°C	-55°C
Operating Temperature (Max)	150°C	150°C	150°C	200°C	200°C	200°C
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 30mA, 10V	40 @ 30mA, 10V	40 @ 30mA, 10V	50 @ 50mA, 10V	50 @ 100mA, 5V	100 @ 500mA, 10V
Vce Saturation (Max) @ Ib, Ic	500mV @ 2mA, 20mA	500mV @ 2mA, 20mA	500mV @ 2mA, 20mA	300mV @ 10mA, 100mA	500mV @ 10mA, 100mA	250mV @ 600mA, 3A
Mounting Type	Through Hole	Through Hole	Surface Mount	Through Hole	Through Hole	Through Hole
Package / Case	TO-92-3	TO-92-3	SOT-23-3	E-Line-3	E-Line-3	E-Line-3
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

KSP42TA (onsemi)

The KSP42TA is an active-status direct equivalent to the MPSW42RLRAG. Both devices share identical electrical specifications including 300 V breakdown voltage, 500 mA maximum collector current, 50 MHz transition frequency, and matching DC current gain characteristics. The KSP42TA is packaged in TO-92-3 through-hole configuration, maintaining mechanical compatibility with the original design. The KSP42TA is ROHS3 compliant and carries REACH Unaffected status. This part is the preferred direct replacement for through-hole applications.

MMBTA42LT1G (onsemi)

The MMBTA42LT1G provides electrical equivalence to the MPSW42RLRAG with identical voltage, current, and gain specifications. This device is packaged in SOT-23-3 surface-mount configuration, requiring PCB layout modification. The MMBTA42LT1G is ROHS3 compliant with operating temperature range of -55°C to 150°C. This part is suitable for designs permitting surface-mount technology migration. Maximum power dissipation is reduced to 225 mW compared to the original 1 W specification.

ZTX457STZ (Diodes Incorporated)

The ZTX457STZ meets all primary substitution criteria with 300 V breakdown voltage and 500 mA maximum collector current. This device features enhanced transition frequency of 75 MHz and extended operating temperature range to 200°C. The ZTX457STZ is packaged in E-Line-3 through-hole configuration, mechanically compatible with TO-92-3 footprints. The part is ROHS3 compliant and carries REACH Unaffected status. Vce saturation is improved at 300 mV. This part is suitable for applications requiring higher frequency performance.

ZTX657STZ (Diodes Incorporated)

The ZTX657STZ satisfies all primary substitution criteria with 300 V breakdown voltage and 500 mA maximum collector current. This device features extended operating temperature range to 200°C and is packaged in E-Line-3 through-hole configuration. The ZTX657STZ is ROHS3 compliant and carries REACH Unaffected status. Transition frequency is 30 MHz, lower than the original specification. This part is suitable for applications where lower frequency operation is acceptable and extended temperature range is beneficial.

ZTX857STZ (Diodes Incorporated)

The ZTX857STZ exceeds primary substitution criteria with 3 A maximum collector current, providing enhanced current handling capability beyond the original 500 mA specification. This device features 300 V breakdown voltage, 80 MHz transition frequency, and extended operating temperature range to 200°C. The ZTX857STZ is packaged in E-Line-3 through-hole configuration. The part is ROHS3 compliant and carries REACH Unaffected status. This part is suitable for applications requiring higher current capacity or improved performance margins.

Frequently Asked Questions (FAQ)

Q: Can KSP42TA be used as a direct replacement for MPSW42RLRAG in existing designs?

A: Yes. The KSP42TA is electrically and mechanically equivalent to the MPSW42RLRAG. Both devices share identical voltage ratings (300 V), current ratings (500 mA), gain characteristics, and TO-92-3 through-hole packaging. No circuit modifications are required.

Q: What is the primary difference between KSP42TA and MMBTA42LT1G?

A: The primary difference is packaging. KSP42TA uses through-hole TO-92-3 configuration, while MMBTA42LT1G uses surface-mount SOT-23-3 configuration. Electrical specifications are equivalent. MMBTA42LT1G has reduced maximum power dissipation (225 mW versus 625 mW for KSP42TA).

Q: Are the Diodes Incorporated ZTX series parts compatible with the original MPSW42RLRAG?

A: Yes, all three Diodes Incorporated parts (ZTX457STZ, ZTX657STZ, ZTX857STZ) meet the primary substitution criteria of 300 V breakdown voltage and 500 mA collector current. All are packaged in through-hole E-Line-3 configuration, mechanically compatible with TO-92-3 footprints. Electrical performance characteristics vary across the series.

Q: Which substitute part offers the best performance upgrade?

A: ZTX857STZ provides the most significant performance enhancement with 3 A maximum collector current (versus 500 mA), 80 MHz transition frequency, and 1.2 W power dissipation. This part is suitable for applications requiring higher current capacity or improved performance margins.

Q: Can MMBTA42LT1G be used in a through-hole PCB design?

A: No. MMBTA42LT1G is a surface-mount device in SOT-23-3 package. Through-hole designs require KSP42TA or the Diodes Incorporated ZTX series parts, which are packaged in through-hole configurations.

Q: What is the operating temperature difference between the original part and substitute options?

A: The MPSW42RLRAG operates from -55°C to 150°C. KSP42TA and MMBTA42LT1G maintain this range. ZTX457STZ, ZTX657STZ, and ZTX857STZ extend the maximum operating temperature to 200°C, providing 50°C additional headroom for high-temperature applications.

Q: Are all substitute parts RoHS compliant?

A: Yes. KSP42TA, MMBTA42LT1G, ZTX457STZ, ZTX657STZ, and ZTX857STZ are all ROHS3 compliant. The original MPSW42RLRAG RoHS status is not specified.

Q: Which substitute part has the lowest transition frequency?

A: ZTX657STZ has a transition frequency of 30 MHz, compared to 50 MHz for the original MPSW42RLRAG. This part is suitable for applications where lower frequency operation is acceptable.

Q: What is the inventory status of substitute parts?

A: KSP42TA has 55,300 units in stock. MMBTA42LT1G has 205,200 units in stock. ZTX457STZ has 10,035 units in stock. ZTX657STZ has 10,400 units in stock. ZTX857STZ has 1,086 units in stock. All substitute parts are in active production status.

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