MMBT5343-G Equivalent & Substitute Parts

Part Overview

The MMBT5343-G is an NPN bipolar junction transistor manufactured by Micro Commercial Co, designed for small-signal switching and amplification applications. This component operates at 50 V collector-emitter breakdown voltage with a maximum collector current of 150 mA and 200 mW power dissipation in a surface-mount SOT-23 package. The part is currently listed as obsolete, making equivalent and substitute components necessary for ongoing design support and production continuity. Active alternatives with matching or enhanced electrical characteristics are available from multiple manufacturers including Nexperia, Toshiba, and onsemi.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	50	V
Current - Collector (Ic) (Max)	150	mA
Power - Max	200	mW
Frequency - Transition	80	MHz
Vce Saturation (Max) @ Ib, Ic	250mV @ 10mA, 100mA	—
Current - Collector Cutoff (Max)	100	nA
Operating Temperature (TJ)	150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MMBT5343-G is determined by strict electrical and mechanical compatibility across the following critical parameters:

Primary Substitution Criteria:

Transistor Type: NPN (required match)
Voltage - Collector Emitter Breakdown (Max): 50 V minimum
Current - Collector (Ic) (Max): 150 mA minimum
Vce Saturation (Max) @ Ib, Ic: 250mV @ 10mA, 100mA (required match)
Current - Collector Cutoff (Max): 100nA (required match)
Package / Case: TO-236-3, SC-59, SOT-23-3 (required match)
Mounting Type: Surface Mount (required match)
RoHS Status: ROHS3 Compliant (required match)
Moisture Sensitivity Level (MSL): 1 (Unlimited) (required match)

Secondary Considerations:

Operating Temperature: 125°C minimum (MMBT5343-G operates to 150°C)
Frequency - Transition: 80 MHz minimum
Power - Max: 150 mW minimum

Substitute parts are grouped into two categories:

Upgrade Substitutes (NXP3875YR, NXP3875YVL): These parts meet all primary electrical criteria with identical voltage, current, saturation, and package specifications. Both are active products with automotive-grade qualification (AEC-Q101) and REACH compliance, providing enhanced product lifecycle support compared to the obsolete MMBT5343-G.

Similar Substitutes (2PD601BSL,215; 2SC2712 variants; CMPT6429 TR PBFREE; MMBT6428LT1G; MMBT6429LT1G): These parts maintain core electrical compatibility within the specified parameter ranges but may exhibit variations in secondary characteristics such as DC current gain, power dissipation, or transition frequency. All maintain the required package, mounting, and compliance specifications.

Parameter Comparison

Parameter	MMBT5343-G	NXP3875YR	NXP3875YVL	2PD601BSL,215	2SC2712-GR,LF	2SC2712-OTE85LF	2SC2712-Y,LF	CMPT6429 TR PBFREE	MMBT6428LT1G	MMBT6429LT1G
Transistor Type	NPN	NPN	NPN	NPN	NPN	NPN	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	50 V	50 V	50 V	50 V	50 V	50 V	50 V	45 V	50 V	45 V
Current - Collector (Ic) (Max)	150 mA	150 mA	150 mA	200 mA	150 mA	150 mA	150 mA	200 mA	200 mA	200 mA
Vce Saturation (Max) @ Ib, Ic	250mV @ 10mA, 100mA	250mV @ 10mA, 100mA	250mV @ 10mA, 100mA	250mV @ 10mA, 100mA	250mV @ 10mA, 100mA	250mV @ 10mA, 100mA	250mV @ 10mA, 100mA	600mV @ 5mA, 100mA	600mV @ 5mA, 100mA	600mV @ 5mA, 100mA
Current - Collector Cutoff (Max)	100 nA	100 nA	100 nA	100 nA	100 nA	100 nA	100 nA	100 nA	100 nA	100 nA
Power - Max	200 mW	200 mW	200 mW	250 mW	150 mW	150 mW	150 mW	350 mW	225 mW	225 mW
Frequency - Transition	80 MHz	80 MHz	80 MHz	250 MHz	80 MHz	80 MHz	80 MHz	700 MHz	700 MHz	700 MHz
Operating Temperature (TJ)	150°C	150°C	150°C	150°C	125°C	125°C	125°C	-65°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active
Automotive Grade / AEC-Q101	—	Yes	Yes	Yes	—	—	—	—	—	—
REACH Status	—	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	—	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Direct Upgrade Path:

NXP3875YR and NXP3875YVL are the primary recommended substitutes for MMBT5343-G. Both parts are manufactured by Nexperia USA Inc. and maintain identical electrical specifications across all critical parameters: 50 V breakdown voltage, 150 mA maximum collector current, 250 mV saturation voltage, and 80 MHz transition frequency. Both are active products with automotive-grade qualification (AEC-Q101) and REACH compliance, providing superior product lifecycle support compared to the obsolete MMBT5343-G. NXP3875YVL offers higher inventory availability (10,737 pcs) compared to NXP3875YR (3,825 pcs).

Alternative Substitutes for Standard Applications:

2SC2712 variants (2SC2712-GR,LF; 2SC2712-OTE85LF; 2SC2712-Y,LF) manufactured by Toshiba Semiconductor are suitable for applications where the 150 mA collector current and 80 MHz transition frequency of the MMBT5343-G are sufficient. These parts maintain identical saturation voltage and package specifications. Operating temperature is limited to 125°C compared to 150°C for the MMBT5343-G. Power dissipation is reduced to 150 mW. All variants are active products with ROHS3 compliance and unlimited moisture sensitivity rating.

Higher Performance Alternatives:

MMBT6428LT1G (onsemi) and MMBT6429LT1G (onsemi) provide enhanced performance characteristics with 200 mA collector current, 700 MHz transition frequency, and 225 mW power dissipation. These parts are suitable for applications requiring higher switching speeds or increased current capacity. MMBT6429LT1G operates at 45 V breakdown voltage and offers the highest inventory availability (155,200 pcs). Both are active products with REACH compliance.

2PD601BSL,215 (NXP Semiconductors) offers 200 mA collector current, 250 MHz transition frequency, and 250 mW power dissipation with automotive-grade qualification (AEC-Q101). This part is suitable for applications requiring higher current capacity while maintaining automotive compliance.

Selection Criteria by Application:

For direct replacement in existing designs with no circuit modifications: Select NXP3875YR or NXP3875YVL.

For applications operating below 125°C junction temperature: 2SC2712 variants are acceptable alternatives.

For applications requiring higher switching speeds or increased current capacity: MMBT6428LT1G or MMBT6429LT1G are appropriate selections.

For automotive applications requiring AEC-Q101 qualification: NXP3875YR, NXP3875YVL, or 2PD601BSL,215 are qualified options.

Frequently Asked Questions (FAQ)

Q: Can NXP3875YR or NXP3875YVL be used as direct replacements for MMBT5343-G without circuit modifications?

A: Yes. NXP3875YR and NXP3875YVL maintain identical electrical specifications for all critical parameters: 50 V breakdown voltage, 150 mA maximum collector current, 250 mV saturation voltage at specified bias conditions, and 80 MHz transition frequency. Both are packaged in TO-236-3 (SOT-23-3) and are pin-compatible with MMBT5343-G. No circuit modifications are required.

Q: What is the difference between NXP3875YR and NXP3875YVL?

A: Both parts are electrically identical with matching specifications. The primary difference is packaging: NXP3875YR is supplied in Tape & Reel (TR) packaging with 3,825 pcs inventory, while NXP3875YVL is also supplied in Tape & Reel (TR) packaging with significantly higher inventory availability (10,737 pcs). Both are active products with AEC-Q101 automotive qualification and REACH compliance.

Q: Are the 2SC2712 variants suitable replacements for MMBT5343-G?

A: 2SC2712 variants (2SC2712-GR,LF; 2SC2712-OTE85LF; 2SC2712-Y,LF) are suitable for applications where the operating junction temperature does not exceed 125°C. These parts maintain identical collector current (150 mA), breakdown voltage (50 V), saturation voltage (250 mV), and transition frequency (80 MHz) specifications. Power dissipation is reduced to 150 mW compared to 200 mW for MMBT5343-G. All variants are packaged in TO-236-3 (SOT-23-3) and are pin-compatible.

Q: What are the advantages of MMBT6428LT1G or MMBT6429LT1G over MMBT5343-G?

A: MMBT6428LT1G and MMBT6429LT1G provide enhanced performance with 700 MHz transition frequency compared to 80 MHz for MMBT5343-G, enabling higher-speed switching applications. Both support 200 mA collector current compared to 150 mA for MMBT5343-G. However, saturation voltage is increased to 600 mV at specified bias conditions compared to 250 mV for MMBT5343-G. These parts are suitable for applications requiring higher switching speeds or increased current capacity.

Q: Is MMBT5343-G still available for purchase?

A: MMBT5343-G is listed as obsolete. However, 1,080 pcs are currently in stock. For new designs or long-term production requirements, active alternatives such as NXP3875YR, NXP3875YVL, or 2SC2712 variants are recommended to ensure ongoing product availability and lifecycle support.

Q: What compliance certifications should I verify when selecting a substitute?

A: All substitute parts listed maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), matching MMBT5343-G specifications. For automotive applications, NXP3875YR, NXP3875YVL, and 2PD601BSL,215 carry AEC-Q101 qualification. NXP3875YR, NXP3875YVL, 2PD601BSL,215, MMBT6428LT1G, MMBT6429LT1G, and 2SC2712-Y,LF have REACH compliance documentation. Verify compliance requirements for your specific application before final part selection.

Q: Can I use CMPT6429 TR PBFREE as a substitute for MMBT5343-G?

A: CMPT6429 TR PBFREE is electrically compatible with MMBT5343-G for basic switching applications. However, this part operates at 45 V breakdown voltage compared to 50 V for MMBT5343-G, and saturation voltage is increased to 600 mV at specified bias conditions compared to 250 mV. CMPT6429 TR PBFREE is suitable only for applications where the reduced breakdown voltage and increased saturation voltage are acceptable. This part is not recommended as a primary substitute.

Q: What is the difference between TO-236-3, SC-59, and SOT-23-3 package designations?

A: TO-236-3, SC-59, and SOT-23-3 are equivalent package designations for the same three-lead surface-mount transistor package. All substitute parts and MMBT5343-G use this identical package, ensuring mechanical and electrical compatibility. The different designations reflect historical naming conventions from different manufacturers and standards organizations.

Q: Are there any temperature derating considerations when selecting a substitute?

A: MMBT5343-G operates to 150°C junction temperature. 2SC2712 variants are rated to 125°C maximum junction temperature, requiring thermal derating for applications operating near the upper temperature limit. NXP3875YR, NXP3875YVL, 2PD601BSL,215, MMBT6428LT1G, and MMBT6429LT1G all support 150°C or higher maximum junction temperature. For applications operating above 125°C, select parts rated to 150°C or higher.

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