CMPT8599 TR PBFREE Equivalent & Substitute Parts

Part Overview

The CMPT8599 TR PBFREE is a surface mount PNP bipolar junction transistor manufactured by Central Semiconductor Corp. This component operates at 80 V collector-emitter breakdown voltage with a maximum collector current of 500 mA, designed for general-purpose switching and amplification applications in SOT-23 packaging. The part is active in production status with full RoHS3 compliance and unlimited moisture sensitivity rating. Equivalent and substitute parts are identified based on matching electrical specifications and mechanical compatibility within the SOT-23 package family.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Collector Current (Max)	500	mA
Collector-Emitter Breakdown Voltage (Max)	80	V
Power Dissipation (Max)	350	mW
Transition Frequency	150	MHz
Operating Temperature Range	-65 to 150	°C
Package Type	SOT-23-3	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the CMPT8599 TR PBFREE is determined by the following critical parameters:

Mandatory Matching Criteria:

Transistor polarity: PNP
Collector current rating: 500 mA minimum
Collector-emitter breakdown voltage: 80 V minimum
Package type: SOT-23-3 (TO-236-3, SC-59)
Surface mount configuration
RoHS3 compliance

Acceptable Variation Parameters:

Power dissipation: 200 mW to 350 mW (lower values acceptable for reduced thermal load applications)
Transition frequency: 50 MHz to 180 MHz (higher frequencies provide backward compatibility)
DC current gain (hFE): 100 minimum (higher values acceptable)
Vce saturation: variations acceptable within switching circuit tolerances
Operating temperature range: -55°C to 150°C acceptable (covers or matches the -65°C to 150°C range)

All identified substitute parts meet these criteria and are classified as direct electrical and mechanical equivalents.

Parameter Comparison

Parameter	CMPT8599 TR PBFREE	2SB1198KT146Q	2SB1198KT146R	MMBTA56Q-7-F	SMMBTA56LT1G	SMMBTA56LT3G
Manufacturer	Central Semiconductor	Rohm Semiconductor	Rohm Semiconductor	Diodes Incorporated	onsemi	onsemi
Transistor Type	PNP	PNP	PNP	PNP	PNP	PNP
Ic (Max)	500 mA	500 mA	500 mA	500 mA	500 mA	500 mA
Vce Breakdown (Max)	80 V	80 V	80 V	80 V	80 V	80 V
Power (Max)	350 mW	200 mW	200 mW	350 mW	225 mW	225 mW
Frequency - Transition	150 MHz	180 MHz	180 MHz	50 MHz	50 MHz	50 MHz
Operating Temperature	-65 to 150°C	150°C	150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C
Package	SOT-23-3	SMT3	SMT3	SOT-23-3	SOT-23-3	SOT-23-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Automotive Grade	—	—	—	AEC-Q101	AEC-Q101	AEC-Q101

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

The MMBTA56Q-7-F (Diodes Incorporated) and SMMBTA56LT1G / SMMBTA56LT3G (onsemi) are direct substitutes with identical electrical ratings and SOT-23-3 package compatibility. These parts carry AEC-Q101 automotive qualification, providing additional reliability assurance for mission-critical applications. All three maintain the 350 mW or 225 mW power dissipation envelope and support the full -55°C to 150°C operating range.

Secondary Substitutes (Rohm Semiconductor):

The 2SB1198KT146Q and 2SB1198KT146R from Rohm Semiconductor are electrically compatible with reduced power dissipation (200 mW). These parts feature higher transition frequency (180 MHz) and are suitable for applications where thermal management is less critical. The SMT3 package designation is mechanically equivalent to SOT-23-3 in the TO-236-3 family.

Selection Criteria:

For automotive or high-reliability applications: Select MMBTA56Q-7-F, SMMBTA56LT1G, or SMMBTA56LT3G (AEC-Q101 qualified)
For standard industrial applications: Any substitute part is acceptable
For low-temperature operation below -55°C: CMPT8599 TR PBFREE is required (rated to -65°C)
For high-power dissipation circuits: CMPT8599 TR PBFREE or MMBTA56Q-7-F (350 mW rating)

All substitute parts are active production items with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Frequently Asked Questions (FAQ)

Q: Can I use 2SB1198KT146Q as a direct replacement for CMPT8599 TR PBFREE?

A: Yes. Both parts are PNP transistors with 500 mA collector current and 80 V breakdown voltage in SOT-23 packaging. The 2SB1198KT146Q has lower power dissipation (200 mW vs. 350 mW) and higher transition frequency (180 MHz vs. 150 MHz), making it suitable for most switching applications. Verify thermal requirements in your specific circuit design.

Q: What is the difference between SMT3 and SOT-23-3 packages?

A: SMT3 and SOT-23-3 are equivalent designations for the same physical package (TO-236-3, SC-59). Both refer to a three-lead surface mount package with identical pin configuration and footprint. Parts using either designation are mechanically interchangeable.

Q: Are the onsemi SMMBTA56LT1G and SMMBTA56LT3G interchangeable?

A: Yes. Both parts are identical in electrical specifications and package type. The designation difference (LT1G vs. LT3G) reflects manufacturing date codes or tape reel configurations but does not affect electrical performance or compatibility.

Q: Why do some substitutes have lower power ratings?

A: The 2SB1198KT146Q and 2SB1198KT146R are rated at 200 mW compared to the CMPT8599's 350 mW. This reflects different thermal design margins. For applications operating at or near maximum power dissipation, verify that the lower-rated part meets your thermal budget. For typical switching circuits operating well below maximum ratings, the lower power-rated parts are fully compatible.

Q: Do all substitute parts have automotive qualification?

A: No. The MMBTA56Q-7-F, SMMBTA56LT1G, and SMMBTA56LT3G carry AEC-Q101 automotive qualification. The 2SB1198KT146Q and 2SB1198KT146R do not list automotive qualification. For automotive applications, select AEC-Q101 qualified parts.

Q: What is the minimum operating temperature for substitute parts?

A: The MMBTA56Q-7-F and onsemi SMMBTA56 series are rated to -55°C. The Rohm 2SB1198 series specification shows 150°C maximum without a stated minimum. If your application requires operation below -55°C, the CMPT8599 TR PBFREE (-65°C minimum) is required.

Q: Can I substitute based on package type alone?

A: No. Package compatibility is necessary but not sufficient. All electrical parameters must match: transistor polarity (PNP), collector current (500 mA), and breakdown voltage (80 V). Verify these specifications before selecting a substitute part.

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