MPSW55RLRAG Equivalent & Substitute Parts

Part Overview

The MPSW55RLRAG is a PNP bipolar junction transistor manufactured by onsemi, rated for 60 V collector-emitter breakdown voltage and 500 mA maximum collector current in a TO-92 through-hole package. This device is classified as obsolete, necessitating identification of active substitute components for new designs and ongoing production requirements. Equivalent parts must maintain functional compatibility across critical electrical parameters including voltage rating, current capacity, and thermal characteristics while accommodating the through-hole TO-92 package form factor.

Key Parameters

Parameter	MPSW55RLRAG	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	60	V
Current - Collector (Ic) (Max)	500	mA
Power - Max	1	W
Frequency - Transition	50	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	50 @ 250mA, 1V	—
Vce Saturation (Max) @ Ib, Ic	500mV @ 10mA, 250mA	—
Operating Temperature	-55 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-226-3, TO-92-3	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the MPSW55RLRAG is determined by alignment of the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor type must be PNP
Collector-emitter breakdown voltage must equal or exceed 60 V
Maximum collector current must equal or exceed 500 mA
Operating temperature range must encompass -55°C to 150°C
Mounting type must be through-hole
Package must be TO-92-3 (TO-226-3)

Secondary Compatibility Factors:

Power dissipation rating
Transition frequency
DC current gain characteristics
Saturation voltage specifications
Product status (active preferred for new designs)

Substitute parts are grouped into two categories based on voltage and current ratings:

Group A (Voltage-Matched, Current-Reduced): Parts with 60 V rating but lower current capacity (KSP55TA at 500 mA matches the original specification exactly).

Group B (Voltage-Reduced, Current-Matched or Exceeded): Parts with 40 V rating but equal or higher current capacity (2N3906 series at 200 mA, 2N4403 series at 600 mA). These require circuit voltage verification before substitution.

Parameter Comparison

Parameter	MPSW55RLRAG	KSP55TA	2N3906TAR	2N3906TF	2N3906TFR	2N4403TA	2N4403TAR	2N4403TF	2N4403TFR
Manufacturer	onsemi	onsemi	onsemi	onsemi	onsemi	onsemi	onsemi	onsemi	onsemi
Transistor Type	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP
Voltage - Collector Emitter Breakdown (Max)	60 V	60 V	40 V	40 V	40 V	40 V	40 V	40 V	40 V
Current - Collector (Ic) (Max)	500 mA	500 mA	200 mA	200 mA	200 mA	600 mA	600 mA	600 mA	600 mA
Power - Max	1 W	625 mW	625 mW	625 mW	625 mW	625 mW	625 mW	625 mW	625 mW
Frequency - Transition	50 MHz	50 MHz	250 MHz	250 MHz	250 MHz	200 MHz	200 MHz	200 MHz	200 MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	50 @ 250mA, 1V	50 @ 100mA, 1V	100 @ 10mA, 1V	100 @ 10mA, 1V	100 @ 10mA, 1V	100 @ 150mA, 2V	100 @ 150mA, 2V	100 @ 150mA, 2V	100 @ 150mA, 2V
Vce Saturation (Max) @ Ib, Ic	500mV @ 10mA, 250mA	250mV @ 10mA, 100mA	400mV @ 5mA, 50mA	400mV @ 5mA, 50mA	400mV @ 5mA, 50mA	750mV @ 50mA, 500mA	750mV @ 50mA, 500mA	750mV @ 50mA, 500mA	750mV @ 50mA, 500mA
Operating Temperature	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Direct Replacement (Preferred):

The KSP55TA is the optimal substitute for the MPSW55RLRAG. This part maintains identical voltage (60 V) and current (500 mA) ratings, matching the original specification exactly. The KSP55TA is manufactured by onsemi, carries active product status, and holds ROHS3 compliance certification. The device is available in cut tape packaging with 4,100 units in stock. The KSP55TA operates across the full -55°C to 150°C temperature range and is housed in the identical TO-92-3 package. Power dissipation is rated at 625 mW, which is lower than the original 1 W specification but remains adequate for most applications within the original current and voltage envelope.

Alternative Substitutes (Conditional):

The 2N3906 series (2N3906TAR, 2N3906TF, 2N3906TFR) and 2N4403 series (2N4403TA, 2N4403TAR, 2N4403TF, 2N4403TFR) are active alternatives manufactured by onsemi with ROHS3 compliance. However, these parts operate at reduced voltage ratings (40 V maximum) compared to the original 60 V specification. The 2N3906 series supports only 200 mA maximum collector current, requiring circuit redesign for applications demanding the full 500 mA capacity. The 2N4403 series accommodates 600 mA collector current, exceeding the original specification. All alternative substitutes feature higher transition frequencies (200–250 MHz) and improved DC current gain characteristics (100 minimum) relative to the original device.

Selection of 2N3906 or 2N4403 series parts is restricted to circuits operating at voltages not exceeding 40 V. These alternatives are suitable only when the original 60 V rating is not required by the application.

Frequently Asked Questions (FAQ)

Q: Can the KSP55TA directly replace the MPSW55RLRAG without circuit modification?

A: Yes. The KSP55TA maintains identical voltage (60 V) and current (500 mA) ratings. Both devices operate across -55°C to 150°C and use the TO-92-3 package. The primary difference is reduced power dissipation (625 mW versus 1 W), which is acceptable for most applications. Pin configuration and polarity are identical.

Q: Why are the 2N3906 and 2N4403 series listed as substitutes if they have lower voltage ratings?

A: These parts are listed because they share the same PNP transistor type, TO-92-3 package, and through-hole mounting. However, their 40 V maximum voltage rating restricts their use to circuits operating below this threshold. They are conditional substitutes only for applications where the original 60 V rating is not required.

Q: What is the impact of the reduced power rating (625 mW) in the KSP55TA compared to the original 1 W?

A: The KSP55TA power rating of 625 mW is sufficient for continuous operation at the specified maximum current (500 mA) and voltage (60 V) within the stated temperature range. Applications requiring sustained power dissipation exceeding 625 mW must employ thermal management or circuit redesign.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts listed (KSP55TA, 2N3906 series, 2N4403 series) carry ROHS3 compliance certification. The original MPSW55RLRAG does not specify RoHS status due to its obsolete classification.

Q: What is the difference between the 2N3906 and 2N4403 series?

A: The 2N3906 series is rated for 200 mA maximum collector current and 250 MHz transition frequency. The 2N4403 series supports 600 mA maximum collector current and 200 MHz transition frequency. Both operate at 40 V maximum voltage. Selection depends on current requirements and frequency response needs of the application.

Q: Can I use the 2N4403 series in place of the MPSW55RLRAG for high-current applications?

A: The 2N4403 series supports 600 mA collector current, exceeding the original 500 mA specification. However, the 40 V voltage rating is lower than the original 60 V. Use the 2N4403 series only in circuits operating at voltages not exceeding 40 V. Verify that the application does not require the full 60 V rating before substitution.

Q: What packaging options are available for the substitute parts?

A: The KSP55TA is available in cut tape (CT) packaging. The 2N3906 series is available in bulk (2N3906TA) and cut tape (2N3906TAR, 2N3906TF, 2N3906TFR) packaging. The 2N4403 series is available in cut tape packaging (2N4403TA, 2N4403TAR, 2N4403TF, 2N4403TFR). All parts use the TO-92-3 through-hole package.

Q: Is the MPSW55RLRAG still available for purchase?

A: The MPSW55RLRAG is classified as obsolete. However, 1,045 units are reported in stock as new original inventory. For new designs and long-term production, the active KSP55TA is the recommended substitute.

Q: What is the difference between the various 2N3906 and 2N4403 part number suffixes (TA, TAR, TF, TFR)?

A: The suffixes indicate packaging and tape configuration variants. TAR and TFR denote cut tape with reel packaging suitable for automated assembly. TA and TF denote alternative tape configurations. All variants maintain identical electrical specifications and TO-92-3 package form factor.

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