MPS8099RLRAG Equivalent & Substitute Parts

Part Overview

The MPS8099RLRAG is an NPN bipolar junction transistor manufactured by onsemi, rated for 80 V collector-emitter breakdown voltage and 500 mA maximum collector current. This device is packaged in a Through Hole TO-92 configuration and is currently classified as obsolete. Due to its obsolete status, equivalent substitute parts are necessary for ongoing design support, production continuity, and component sourcing. Suitable alternatives maintain the core electrical specifications while offering either active product status or improved packaging options for modern manufacturing processes.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	80	V
Current - Collector (Ic) (Max)	500	mA
Power - Max	625	mW
Frequency - Transition	150	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 1mA, 5V	—
Operating Temperature Range	-55 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3	—

Substitute Part Grouping Explanation

Substitution of the MPS8099RLRAG is determined by strict equivalence across the following electrical and mechanical parameters:

Electrical Equivalence Criteria:

Transistor Type: NPN
Voltage - Collector Emitter Breakdown (Max): 80 V
Current - Collector (Ic) (Max): 500 mA
DC Current Gain (hFE) (Min): 100 or greater
Operating Temperature Range: -55°C to 150°C minimum

Mechanical Compatibility Criteria:

Mounting Type: Through Hole or Surface Mount (with design accommodation)
Package / Case: TO-92-3 or equivalent footprint

Substitute parts are grouped into two categories based on mounting technology:

Through Hole Equivalents (MPSA06, MPSA06RA): Direct mechanical replacement in existing PCB designs with identical or compatible TO-92 footprints.
Surface Mount Equivalent (MMBT8099LT1G): Functional equivalent for new designs or board redesigns utilizing modern surface mount assembly processes.

All substitute parts maintain the core electrical specifications required for circuit operation while differing in secondary parameters such as transition frequency, saturation voltage, or power dissipation rating.

Parameter Comparison

Parameter	MPS8099RLRAG	MMBT8099LT1G	MPSA06	MPSA06RA
Manufacturer	onsemi	onsemi	Fairchild Semiconductor	onsemi
Transistor Type	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	80 V	80 V	80 V	80 V
Current - Collector (Ic) (Max)	500 mA	500 mA	500 mA	500 mA
Current - Collector Cutoff (Max)	100 nA	100 nA	100 nA	100 nA
DC Current Gain (hFE) (Min)	100 @ 1mA, 5V	100 @ 1mA, 5V	100 @ 100mA, 1V	100 @ 100mA, 1V
Power - Max	625 mW	225 mW	625 mW	625 mW
Frequency - Transition	150 MHz	150 MHz	100 MHz	100 MHz
Operating Temperature Range	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C
Mounting Type	Through Hole	Surface Mount	Through Hole	Through Hole
Package / Case	TO-92-3	SOT-23-3	TO-92-3	TO-92-3
Product Status	Obsolete	Active	Active	Active
Vce Saturation (Max) @ Ib, Ic	400mV @ 5mA, 100mA	400mV @ 5mA, 100mA	250mV @ 10mA, 100mA	250mV @ 10mA, 100mA

Engineering Selection Recommendations

For Direct Through Hole Replacement:

MPSA06RA is the preferred substitute for through hole applications. This part is manufactured by onsemi, maintains active product status, and is RoHS3 compliant. It provides identical mechanical compatibility with existing TO-92-3 footprints and meets all core electrical requirements. The MPSA06RA exhibits lower saturation voltage (250 mV versus 400 mV) and reduced transition frequency (100 MHz versus 150 MHz) compared to the MPS8099RLRAG; these differences are acceptable for general-purpose switching and amplification circuits where the original specifications were not marginal.

MPSA06 from Fairchild Semiconductor is an alternative through hole option with equivalent electrical performance to MPSA06RA. Both parts are suitable for direct PCB substitution without layout modification.

For Surface Mount Applications:

MMBT8099LT1G is the functional equivalent for new designs or board redesigns utilizing surface mount technology. Manufactured by onsemi with active product status, this part maintains the original electrical specifications including 150 MHz transition frequency and 400 mV saturation voltage. The reduced power rating (225 mW versus 625 mW) reflects the improved thermal characteristics of the SOT-23-3 package and is acceptable for most applications. This part is RoHS3 compliant.

Compliance and Certification:

All substitute parts carry REACH Unaffected status and EAR99 ECCN classification, matching the regulatory profile of the original MPS8099RLRAG. MMBT8099LT1G and MPSA06RA are RoHS3 compliant, supporting modern procurement requirements.

Frequently Asked Questions (FAQ)

Q: Can MMBT8099LT1G replace MPS8099RLRAG in an existing design without PCB modification?

A: No. MMBT8099LT1G uses a surface mount SOT-23-3 package, while MPS8099RLRAG uses a through hole TO-92-3 package. Direct PCB substitution is not possible without footprint redesign. However, MMBT8099LT1G is electrically equivalent and suitable for new board designs or complete board redesigns.

Q: What is the difference between MPSA06 and MPSA06RA?

A: Both parts are electrically equivalent NPN transistors with identical electrical specifications. MPSA06 is supplied by Fairchild Semiconductor in bulk packaging, while MPSA06RA is supplied by onsemi in cut tape packaging. MPSA06RA is RoHS3 compliant. Selection depends on packaging preference and supply chain requirements.

Q: Why does MMBT8099LT1G have a lower power rating (225 mW) than MPS8099RLRAG (625 mW)?

A: The power rating difference reflects the thermal characteristics of the respective packages. The SOT-23-3 surface mount package has superior thermal performance compared to the TO-92-3 through hole package, allowing the same die to dissipate rated power at lower absolute wattage. For most applications, the MMBT8099LT1G power rating is sufficient.

Q: Are there differences in saturation voltage between the substitute parts?

A: Yes. MPS8099RLRAG and MMBT8099LT1G both specify 400 mV saturation voltage at 5 mA base current and 100 mA collector current. MPSA06 and MPSA06RA specify 250 mV saturation voltage at 10 mA base current and 100 mA collector current. The lower saturation voltage in MPSA06 and MPSA06RA may improve switching efficiency in saturation-mode applications.

Q: Can I use MPSA06 or MPSA06RA as a direct replacement in my existing circuit?

A: Yes, for through hole applications. Both MPSA06 and MPSA06RA are mechanically and electrically compatible with MPS8099RLRAG. They fit the same TO-92-3 footprint and meet all core electrical requirements. Verify that the lower transition frequency (100 MHz versus 150 MHz) and different saturation voltage characteristics do not impact circuit performance in your specific application.

Q: What is the inventory status of these substitute parts?

A: MMBT8099LT1G has 20,100 units in stock. MPSA06 has 100,400 units in stock. MPSA06RA has 6,100 units in stock. All substitute parts are currently available from inventory.

Q: Is MPS8099RLRAG still available for purchase?

A: MPS8099RLRAG is classified as obsolete. While 739 units remain in stock, this part is no longer in active production. For new designs or ongoing production, use one of the active substitute parts listed in this document.

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