CMPT3820 TR PBFREE Equivalent & Substitute Parts

Part Overview

The CMPT3820 TR PBFREE is an NPN bipolar junction transistor manufactured by Central Semiconductor Corp, designed for surface mount applications in the SOT-23 package. This device operates at maximum ratings of 60 V collector-emitter breakdown voltage and 1 A collector current, with a maximum power dissipation of 350 mW and transition frequency of 150 MHz. The part is classified as Active product status and is ROHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or design optimization needs.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) Max	1	A
Voltage - Collector Emitter Breakdown (Max)	60	V
Power - Max	350	mW
Frequency - Transition	150	MHz
Operating Temperature Range	-65 to 150	°C
Package / Case	SOT-23-3	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution eligibility for the CMPT3820 TR PBFREE is determined by the following critical parameters:

Primary Substitution Criteria:

Transistor Type: NPN
Collector Current (Ic) Max: 1 A or greater
Collector-Emitter Breakdown Voltage (VCEO): 60 V or greater
Package / Case: SOT-23-3 (TO-236-3, SC-59)
Mounting Type: Surface Mount

Secondary Compatibility Parameters:

Transition Frequency: 150 MHz or greater
Power Dissipation: 350 mW or greater
Operating Temperature Range: Must accommodate -65°C to 150°C or equivalent upper limit
RoHS Compliance: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Substitute parts are grouped into two categories: Parametric Equivalents (identical electrical specifications within tolerance) and Manufacturer Recommended Alternatives (enhanced or equivalent performance with compatible package and electrical ratings).

Parameter Comparison

Parameter	CMPT3820 TR PBFREE	CMPT491E TR PBFREE	FMMT451TA	FMMT491TC	FMMTL619TA	PBSS4160TVL
Manufacturer	Central Semiconductor	Central Semiconductor	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated	Nexperia USA Inc.
Transistor Type	NPN	NPN	NPN	NPN	NPN	NPN
Ic (Max) [A]	1	1	1	1	1.25	1
VCEO (Max) [V]	60	60	60	60	50	60
Power - Max [mW]	350	350	500	500	500	400
Frequency - Transition [MHz]	150	150	150	150	180	220
Package / Case	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3
Operating Temperature [°C]	-65 to 150	-65 to 150	-55 to 150	-55 to 150	-55 to 150	to 150
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

CMPT491E TR PBFREE (Parametric Equivalent) This part is a direct parametric equivalent from Central Semiconductor Corp with identical electrical specifications to the CMPT3820 TR PBFREE. Both devices share the same manufacturer, package, and core ratings. The primary difference is Vce saturation specification (400 mV vs. 280 mV), which represents a relaxed specification. This part is suitable for direct substitution where inventory or supply chain requirements necessitate an alternative from the same manufacturer. Product status is Active with ROHS3 compliance and unlimited moisture sensitivity rating.

FMMT451TA (Manufacturer Recommended Alternative) This Diodes Incorporated device meets all primary substitution criteria with identical Ic, VCEO, and package specifications. Enhanced power dissipation (500 mW vs. 350 mW) and equivalent transition frequency (150 MHz) provide design margin. Operating temperature range is -55°C to 150°C, which covers the upper operating limit of the CMPT3820 but does not extend to the lower -65°C specification. This part is suitable for applications where the lower temperature limit is not required. Product status is Active with ROHS3 compliance.

FMMT491TC (Manufacturer Recommended Alternative) This Diodes Incorporated device provides enhanced power dissipation (500 mW) and improved Vce saturation (250 mV), indicating superior switching performance. Electrical ratings match the CMPT3820 for Ic, VCEO, and frequency. Operating temperature range is -55°C to 150°C. This part is suitable for applications requiring improved saturation characteristics and thermal headroom. Product status is Active with ROHS3 compliance.

FMMTL619TA (Manufacturer Recommended Alternative) This Diodes Incorporated device exceeds the CMPT3820 specifications in collector current (1.25 A vs. 1 A), transition frequency (180 MHz vs. 150 MHz), and power dissipation (500 mW). However, the maximum collector-emitter breakdown voltage is 50 V, which is below the 60 V specification of the CMPT3820. This part is suitable only for applications where the 50 V rating is acceptable and higher current capability is beneficial. Operating temperature range is -55°C to 150°C. Product status is Active with ROHS3 compliance.

PBSS4160TVL (Manufacturer Recommended Alternative) This Nexperia USA Inc. device meets all primary substitution criteria with identical Ic and VCEO ratings. Enhanced transition frequency (220 MHz vs. 150 MHz) and improved Vce saturation (250 mV) provide superior switching performance. Power dissipation is 400 mW, exceeding the 350 mW specification. Operating temperature specification is listed as maximum 150°C without lower limit detail. This part is suitable for applications requiring enhanced frequency performance. Product status is Active with ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can CMPT491E TR PBFREE be used as a direct replacement for CMPT3820 TR PBFREE?

A: Yes. Both parts are manufactured by Central Semiconductor Corp with identical electrical ratings for collector current (1 A), collector-emitter breakdown voltage (60 V), transition frequency (150 MHz), and power dissipation (350 mW). Both use the SOT-23-3 package and are ROHS3 compliant. The Vce saturation specification differs (400 mV vs. 280 mV), representing a relaxed specification on the CMPT491E. Direct substitution is valid for equivalent circuit performance.

Q: What is the key difference between FMMT451TA and FMMT491TC?

A: Both are Diodes Incorporated devices in SOT-23-3 packages with identical Ic (1 A), VCEO (60 V), and transition frequency (150 MHz) ratings. The primary difference is Vce saturation: FMMT491TC specifies 250 mV at 100 mA, 1 A, while FMMT451TA specifies 350 mV at 15 mA, 150 mA. FMMT491TC exhibits superior saturation characteristics. Both have 500 mW power dissipation and -55°C to 150°C operating range.

Q: Is FMMTL619TA a suitable substitute for CMPT3820 TR PBFREE?

A: FMMTL619TA exceeds CMPT3820 specifications in collector current (1.25 A) and transition frequency (180 MHz). However, the maximum collector-emitter breakdown voltage is 50 V, which is 10 V below the CMPT3820 specification of 60 V. Substitution is valid only if the application circuit operates at voltages not exceeding 50 V. The enhanced current and frequency ratings provide additional design margin in compatible voltage domains.

Q: What are the package compatibility requirements for substitution?

A: All listed substitute parts use the SOT-23-3 package (also designated TO-236-3 or SC-59), which is mechanically and electrically compatible with the CMPT3820 TR PBFREE. Surface mount assembly processes, PCB footprints, and lead configurations are identical across all listed parts. No package-related design modifications are required for substitution.

Q: How does operating temperature range affect substitution eligibility?

A: The CMPT3820 TR PBFREE operates from -65°C to 150°C. Substitute parts from Diodes Incorporated and Nexperia operate from -55°C to 150°C, which covers the upper operating limit but does not extend to the lower -65°C specification. Substitution is valid for applications where the lower temperature limit is not required. If operation below -55°C is necessary, the CMPT491E TR PBFREE maintains the full -65°C to 150°C range.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (CMPT491E TR PBFREE, FMMT451TA, FMMT491TC, FMMTL619TA, and PBSS4160TVL) are ROHS3 compliant with moisture sensitivity level 1 (unlimited). Compliance certifications are equivalent across all parts, supporting direct substitution in applications with ROHS3 requirements.

Q: What is the significance of Vce saturation differences among substitute parts?

A: Vce saturation indicates the voltage drop across the transistor when operating in saturation mode (fully conducting). Lower Vce saturation values (FMMT491TC at 250 mV, PBSS4160TVL at 250 mV) represent superior switching efficiency and reduced power dissipation during saturation. Higher values (CMPT3820 at 280 mV, CMPT491E at 400 mV) are acceptable for general-purpose switching applications. Selection depends on circuit requirements for switching speed and thermal performance.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message