MMBTH24-7-F Equivalent & Substitute Parts

Part Overview

The MMBTH24-7-F is an RF transistor manufactured by Diodes Incorporated, classified as an NPN bipolar junction transistor (BJT) in the SOT-23-3 surface mount package. This device is rated for 40V collector-emitter breakdown voltage with a maximum collector current of 50mA and operates at frequencies up to 400MHz with a maximum power dissipation of 300mW.

The MMBTH24-7-F is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this RF transistor.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	40	V
Current - Collector (Ic) (Max)	50	mA
Frequency - Transition	400	MHz
Power - Max	300	mW
DC Current Gain (hFE) (Min) @ Ic, Vce	30 @ 8mA, 10V	—
Operating Temperature	-55 to 150	°C (TJ)
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the MMBTH24-7-F is determined by the following critical electrical and mechanical parameters:

Mandatory Compatibility Criteria:

Transistor Type: NPN
Package / Case: TO-236-3, SC-59, SOT-23-3 (surface mount)
Mounting Type: Surface Mount
Voltage - Collector Emitter Breakdown (Max): Must equal or exceed 40V
Current - Collector (Ic) (Max): Must equal or exceed 50mA
Operating Temperature Range: Must encompass -55°C to 150°C
RoHS Status: ROHS3 Compliant

Substitute parts are grouped into two categories based on electrical performance:

Group 1 - Nexperia BF840 Series (BF840,215 and BF840,235): These parts maintain the 40V voltage rating and SOT-23-3 package but operate at reduced collector current (25mA maximum) and lower transition frequency (380MHz). These substitutes are suitable for applications where the reduced current capacity is acceptable.

Group 2 - onsemi MMBT Series (MMBT2484LT1G, MMBT2484LT3G, MMBT3416LT3G, MMBT6429LT1G): These parts maintain the SOT-23-3 package and NPN configuration with enhanced electrical performance. MMBT3416LT3G matches the 40V rating. MMBT2484 and MMBT6429 variants exceed the voltage rating (60V and 45V respectively) and provide higher collector current capacity (100mA to 200mA) and improved frequency performance (700MHz for MMBT6429LT1G).

All substitute parts are active products with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Parameter Comparison

Parameter	MMBTH24-7-F	BF840,215	BF840,235	MMBT2484LT1G	MMBT2484LT3G	MMBT3416LT3G	MMBT6429LT1G
Manufacturer	Diodes Inc.	Nexperia USA Inc.	Nexperia USA Inc.	onsemi	onsemi	onsemi	onsemi
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Transistor Type	NPN	NPN	NPN	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	40V	40V	40V	60V	60V	40V	45V
Current - Collector (Ic) (Max)	50mA	25mA	25mA	100mA	100mA	100mA	200mA
Frequency - Transition	400MHz	380MHz	380MHz	—	—	—	700MHz
Power - Max	300mW	250mW	250mW	225mW	225mW	225mW	225mW
Operating Temperature	-55 to 150°C	150°C	150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C
Package / Case	SOT-23-3	TO-236-3	TO-236-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Voltage and Current Compatibility:

The MMBT3416LT3G is the most direct substitute for the MMBTH24-7-F, maintaining the 40V collector-emitter breakdown voltage rating. This part is manufactured by onsemi, carries active product status, and provides 100mA collector current capacity, which exceeds the original 50mA specification. The MMBT3416LT3G is ROHS3 compliant and operates across the full temperature range of -55°C to 150°C.

For Enhanced Performance Applications:

The MMBT6429LT1G offers superior RF performance with a 700MHz transition frequency compared to the original 400MHz specification. This part is rated for 45V collector-emitter breakdown voltage and supports 200mA collector current. The MMBT6429LT1G is suitable for applications requiring higher frequency operation while maintaining compatibility with the SOT-23-3 package footprint.

For Conservative Current Derating:

The BF840,215 and BF840,235 (Nexperia USA Inc.) maintain the exact 40V voltage rating and 380MHz frequency specification, providing minimal electrical deviation from the original part. These substitutes operate at 25mA maximum collector current. Both variants are AEC-Q101 qualified automotive-grade components with active product status.

For Voltage-Tolerant Applications:

The MMBT2484LT1G and MMBT2484LT3G provide 60V collector-emitter breakdown voltage with 100mA collector current capacity. These parts are suitable for applications where higher voltage margin is beneficial. Both variants are onsemi products with active status and full temperature range support.

All recommended substitutes maintain ROHS3 compliance, unlimited moisture sensitivity level (MSL 1), and surface mount SOT-23-3 package compatibility.

Frequently Asked Questions (FAQ)

Q: Can the BF840,215 or BF840,235 be used as direct replacements for the MMBTH24-7-F?

A: The BF840 series maintains the 40V voltage rating and operates at 380MHz, which is close to the original 400MHz specification. However, the maximum collector current is reduced to 25mA compared to the original 50mA. These substitutes are suitable only if the application circuit operates at collector currents below 25mA.

Q: What is the primary advantage of the MMBT6429LT1G over the MMBTH24-7-F?

A: The MMBT6429LT1G provides a transition frequency of 700MHz, which is significantly higher than the original 400MHz specification. This part also supports 200mA collector current compared to the original 50mA. The 45V voltage rating exceeds the original 40V specification, providing additional voltage margin.

Q: Are all substitute parts compatible with the original SOT-23-3 footprint?

A: Yes. All substitute parts listed are packaged in SOT-23-3 (TO-236-3, SC-59) surface mount packages. The physical footprint and pin configuration are identical, allowing direct PCB layout compatibility without redesign.

Q: Which substitute part has the closest electrical specifications to the MMBTH24-7-F?

A: The MMBT3416LT3G matches the 40V collector-emitter breakdown voltage rating exactly. This part provides 100mA collector current capacity and operates across the full -55°C to 150°C temperature range, making it the most conservative electrical substitute.

Q: Do all substitute parts meet RoHS3 compliance requirements?

A: Yes. All substitute parts listed are ROHS3 compliant with unlimited moisture sensitivity level (MSL 1), matching the environmental compliance profile of the original MMBTH24-7-F.

Q: What is the difference between BF840,215 and BF840,235?

A: Both BF840,215 and BF840,235 are manufactured by Nexperia USA Inc. and share identical electrical specifications: 40V voltage rating, 25mA maximum collector current, 380MHz transition frequency, and 250mW power dissipation. The part number suffix indicates different packaging or tape reel configurations. Both are active products with equivalent technical performance.

Q: Can the MMBT2484LT1G and MMBT2484LT3G be used interchangeably?

A: Yes. Both MMBT2484LT1G and MMBT2484LT3G are manufactured by onsemi with identical electrical specifications: 60V voltage rating, 100mA collector current, 225mW power dissipation, and full temperature range support. The suffix indicates different packaging formats (Cut Tape versus Tape & Reel). Electrical performance is equivalent.

Q: Is the operating temperature range important for substitution?

A: Yes. The original MMBTH24-7-F operates from -55°C to 150°C. Substitute parts must support this full temperature range for applications requiring operation across this specification. The BF840 series is rated to 150°C maximum only, without the lower -55°C specification. The onsemi MMBT series parts support the full -55°C to 150°C range.

Q: What should be verified when transitioning from the MMBTH24-7-F to a substitute part?

A: Circuit design must account for differences in maximum collector current, voltage rating, and frequency response. The BF840 series operates at reduced collector current (25mA). The MMBT2484 and MMBT6429 variants operate at higher voltage ratings (60V and 45V respectively) and higher collector currents (100mA to 200mA). PCB layout remains compatible due to identical SOT-23-3 packaging.

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