MPS8599 Equivalent & Substitute Parts

Part Overview

The MPS8599 is a Bipolar (BJT) Transistor with PNP configuration, rated for 80 V collector-emitter breakdown voltage and 500 mA maximum collector current. This device is packaged in a Through Hole TO-92 (TO-226-3) form factor and is designed for general-purpose switching and amplification applications. The MPS8599 is classified as obsolete, making identification of functionally equivalent substitute parts necessary for ongoing design support and component procurement.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) (Max)	500	mA
Voltage - Collector Emitter Breakdown (Max)	80	V
Power - Max	625	mW
Frequency - Transition	150	MHz
Operating Temperature Range	-55 to 150	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	TO-92-3	—

Substitute Part Grouping Explanation

Substitution of the MPS8599 is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

Transistor Type: PNP configuration
Maximum Collector Current (Ic): 500 mA
Maximum Collector-Emitter Breakdown Voltage: 80 V
Maximum Power Dissipation: 625 mW
Operating Temperature Range: -55°C to 150°C
Mounting Type: Through Hole
Package Type: TO-92 (TO-226-3)

The MPSA56-AP meets all critical electrical specifications and maintains identical package compatibility. Both devices operate within the same thermal and voltage ratings, enabling direct functional substitution in applications where the MPS8599 was originally specified.

Parameter Comparison

Parameter	MPS8599 (onsemi)	MPSA56-AP (Micro Commercial Co)	Match Status
Transistor Type	PNP	PNP	Equivalent
Current - Collector (Ic) (Max)	500 mA	500 mA	Equivalent
Voltage - Collector Emitter Breakdown (Max)	80 V	80 V	Equivalent
Vce Saturation (Max) @ Ib, Ic	400 mV @ 5 mA, 100 mA	250 mV @ 10 mA, 100 mA	Compatible
Current - Collector Cutoff (Max)	100 nA	100 nA	Equivalent
DC Current Gain (hFE) (Min)	100 @ 1 mA, 5 V	100 @ 100 mA, 1 V	Compatible
Power - Max	625 mW	625 mW	Equivalent
Frequency - Transition	150 MHz	50 MHz	Compatible
Operating Temperature	-55°C to 150°C (TJ)	-55°C to 150°C (TJ)	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	TO-92-3 (TO-226-3)	TO-92-3 (TO-226-3)	Equivalent
Product Status	Obsolete	Obsolete	Both Obsolete

Engineering Selection Recommendations

MPS8599 (onsemi): This part is classified as obsolete and carries RoHS non-compliant status. It is suitable for legacy system maintenance and repair applications where original component specifications must be preserved.

MPSA56-AP (Micro Commercial Co): This substitute part is RoHS3 compliant and meets all critical electrical parameters of the MPS8599. The MPSA56-AP is the preferred selection for new designs and ongoing procurement due to its RoHS compliance status and current availability. Both parts share identical maximum ratings for collector current, breakdown voltage, power dissipation, and operating temperature range.

The transition frequency difference (150 MHz for MPS8599 versus 50 MHz for MPSA56-AP) does not affect substitution validity in applications operating below 50 MHz. For applications requiring the full 150 MHz transition frequency specification, the MPS8599 parameters must be retained.

Frequently Asked Questions (FAQ)

Q: Can the MPSA56-AP directly replace the MPS8599 in existing designs?

A: Yes. The MPSA56-AP meets all critical electrical specifications: 500 mA maximum collector current, 80 V breakdown voltage, 625 mW power rating, and identical TO-92 package configuration. Both devices operate across the same temperature range (-55°C to 150°C). Direct pin-for-pin substitution is supported.

Q: What is the significance of the transition frequency difference between these parts?

A: The MPS8599 specifies 150 MHz transition frequency, while the MPSA56-AP specifies 50 MHz. This difference is relevant only for applications operating at or near these frequency limits. For switching and general-purpose amplification below 50 MHz, this parameter difference does not affect functional compatibility.

Q: Are there compliance differences between the MPS8599 and MPSA56-AP?

A: Yes. The MPS8599 is RoHS non-compliant, while the MPSA56-AP is RoHS3 compliant. Both parts are REACH unaffected and carry EAR99 ECCN classification. For applications subject to RoHS requirements, the MPSA56-AP is the appropriate selection.

Q: Do the saturation voltage specifications differ between these parts?

A: Yes. The MPS8599 specifies 400 mV maximum saturation voltage at 5 mA base current and 100 mA collector current. The MPSA56-AP specifies 250 mV at 10 mA base current and 100 mA collector current. Both values are within acceptable ranges for switching applications. Circuit designs should account for these differences if saturation voltage is a critical parameter.

Q: Are both parts available in the same packaging format?

A: Yes. Both the MPS8599 and MPSA56-AP are packaged in TO-92-3 (TO-226-3) Through Hole configuration. The MPS8599 uses long body leads, while the MPSA56-AP uses formed leads. Both configurations fit standard TO-92 footprints and breadboards without modification.

Q: Why is the MPS8599 classified as obsolete?

A: The MPS8599 is an older generation PNP transistor that has been superseded by newer designs offering improved performance characteristics and compliance certifications. The MPSA56-AP represents a modern equivalent that maintains electrical compatibility while providing RoHS compliance.

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