MMBT3904T-TP Equivalent & Substitute Parts

Part Overview

The MMBT3904T-TP is an NPN bipolar junction transistor manufactured by Micro Commercial Co, designed for general-purpose switching and amplification applications. This surface mount device operates at 40V collector-emitter breakdown voltage with a maximum collector current of 200 mA and transition frequency of 300 MHz. The part is active in production status and ROHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are identified to address component availability, supply chain requirements, packaging preferences, and performance specifications. Substitution is determined by matching critical electrical parameters including collector current rating, breakdown voltage, saturation characteristics, and frequency response within the constraints of the SOT-523 package family and related surface mount packages.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	40	V
Current - Collector (Ic) (Max)	200	mA
Vce Saturation (Max) @ Ib, Ic	300mV @ 5mA, 50mA	—
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 10mA, 1V	—
Power - Max	150	mW
Frequency - Transition	300	MHz
Operating Temperature Range	-55 to 150	°C
Package / Case	SOT-523	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts are classified into three categories based on electrical and mechanical compatibility with the MMBT3904T-TP:

Direct Substitutes maintain identical electrical specifications and package type (SOT-523), differing only in manufacturer or packaging format (tape & reel versus cut tape). These parts are pin-compatible and functionally interchangeable without circuit modification.

Upgrade Substitutes provide enhanced performance characteristics while maintaining core electrical parameters. These parts feature increased power dissipation capability (200 mW versus 150 mW) and automotive-grade qualification (AEC-Q101), packaged in SOT-323 (SC-70) format. The SOT-323 package is mechanically compatible with SOT-523 footprints in most applications, though PCB layout verification is required.

Similar Substitutes share the NPN transistor type, 40V breakdown voltage, and 300 MHz transition frequency but differ in collector current rating, saturation voltage, or frequency response. These parts are suitable for applications where the specified current or frequency requirements differ from the primary design specification.

Substitution logic is based on the following key parameters:

Transistor polarity (NPN)
Collector-emitter breakdown voltage (40V minimum)
Maximum collector current (200 mA or higher)
Transition frequency (300 MHz or higher)
Package compatibility (SOT-523 or related surface mount packages)
Saturation voltage characteristics
Operating temperature range (-55°C to 150°C)

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	Vce Sat (Max) mV	hFE (Min)	Freq MHz	Power mW	Package	Grade
MMBT3904T-TP	Micro Commercial Co	200	40	300	100	300	150	SOT-523	Commercial
MMBT3904T-7-F	Diodes Incorporated	200	40	300	100	300	150	SOT-523	Automotive
PMST3904,115	Nexperia USA Inc.	200	40	300	100	300	200	SOT-323	Automotive
PMST3904,135	Nexperia USA Inc.	200	40	300	100	300	200	SOT-323	Automotive
BC847AT-7-F	Diodes Incorporated	100	45	600	110	100	150	SOT-523	Commercial
BC847BT-7-F	Diodes Incorporated	100	45	600	200	100	150	SOT-523	Commercial
BC847CT-7-F	Diodes Incorporated	100	45	600	420	100	150	SOT-523	Commercial
MMBT2222AT-7-F	Diodes Incorporated	600	40	1000	100	300	150	SOT-523	Automotive
MMBT3904TT1G	onsemi	200	40	300	100	300	300	SC-75, SOT-416	Commercial
MMBT4401T-7-F	Diodes Incorporated	600	40	750	100	250	150	SOT-523	Automotive
UMT3904T106	Rohm Semiconductor	200	40	300	100	300	200	SC-70, SOT-323	Commercial

Engineering Selection Recommendations

Direct Substitution (MMBT3904T-7-F)

The MMBT3904T-7-F manufactured by Diodes Incorporated is a direct electrical equivalent to the MMBT3904T-TP. Both parts share identical electrical specifications: 40V breakdown voltage, 200 mA collector current, 300 mV saturation voltage at specified bias conditions, 100 minimum hFE, and 300 MHz transition frequency. The primary difference is manufacturer and packaging format (cut tape with Digi-Reel versus tape & reel). This part carries automotive-grade qualification (AEC-Q101) and is ROHS3 compliant. Selection of this part is appropriate for applications requiring equivalent performance with automotive-qualified components.

Upgrade Substitution (PMST3904,115 and PMST3904,135)

The PMST3904,115 and PMST3904,135 manufactured by Nexperia USA Inc. provide enhanced power dissipation (200 mW versus 150 mW) while maintaining identical electrical performance. Both parts are packaged in SOT-323 (SC-70) format and carry AEC-Q101 automotive qualification. The SOT-323 package is mechanically smaller than SOT-523 but maintains electrical compatibility. These parts are suitable for applications where increased thermal headroom is beneficial or where SOT-323 footprints are preferred. PCB layout compatibility must be verified prior to implementation.

Similar Substitution (BC847 Series)

The BC847AT-7-F, BC847BT-7-F, and BC847CT-7-F are similar NPN transistors with 45V breakdown voltage and 100 mA maximum collector current. These parts operate at 100 MHz transition frequency, lower than the MMBT3904T-TP. The BC847 series exhibits higher saturation voltage (600 mV) and variable hFE characteristics (110 to 420 minimum). These parts are suitable for low-current applications where the reduced current rating and frequency response are acceptable.

Similar Substitution (MMBT2222AT-7-F)

The MMBT2222AT-7-F is an automotive-qualified NPN transistor with 600 mA maximum collector current, 40V breakdown voltage, and 300 MHz transition frequency. This part is suitable for applications requiring higher current capability than the MMBT3904T-TP. The higher saturation voltage (1V at specified conditions) must be considered in circuit design. This part is ROHS3 compliant and AEC-Q101 qualified.

Similar Substitution (MMBT3904TT1G)

The MMBT3904TT1G manufactured by onsemi provides identical electrical specifications to the MMBT3904T-TP but is packaged in SC-75 (SOT-416) format with doubled power dissipation capability (300 mW). This part is suitable for applications where increased thermal performance is required. The SC-75 package is mechanically larger than SOT-523 and requires PCB layout verification.

Similar Substitution (MMBT4401T-7-F)

The MMBT4401T-7-F is an automotive-qualified NPN transistor with 600 mA maximum collector current, 40V breakdown voltage, and 250 MHz transition frequency. This part is suitable for higher-current applications. The reduced transition frequency (250 MHz versus 300 MHz) and higher saturation voltage (750 mV) must be evaluated against circuit requirements.

Similar Substitution (UMT3904T106)

The UMT3904T106 manufactured by Rohm Semiconductor provides identical electrical specifications to the MMBT3904T-TP with enhanced power dissipation (200 mW) and is packaged in UMT3 (SC-70, SOT-323) format. This part is suitable for applications where the smaller SOT-323 package and increased thermal capability are beneficial.

Frequently Asked Questions (FAQ)

Q: Can MMBT3904T-7-F be used as a direct replacement for MMBT3904T-TP?

A: Yes. The MMBT3904T-7-F is electrically identical to the MMBT3904T-TP with matching collector current (200 mA), breakdown voltage (40V), saturation voltage (300 mV), hFE (100 minimum), and transition frequency (300 MHz). Both are packaged in SOT-523. The primary difference is manufacturer (Diodes Incorporated versus Micro Commercial Co) and packaging format. The MMBT3904T-7-F carries automotive qualification (AEC-Q101), which may be beneficial for certain applications.

Q: What is the difference between SOT-523 and SOT-323 packages?

A: SOT-523 and SOT-323 are both surface mount packages for three-terminal devices. SOT-323 (also designated SC-70) is mechanically smaller than SOT-523. Both packages maintain the same pin configuration and electrical compatibility. PCB footprint dimensions differ, requiring layout verification before substitution. The PMST3904,115 and PMST3904,135 use SOT-323 packaging with identical electrical performance to the MMBT3904T-TP.

Q: Can BC847 series transistors replace the MMBT3904T-TP?

A: BC847 series transistors (BC847AT-7-F, BC847BT-7-F, BC847CT-7-F) are similar but not equivalent. These parts have lower maximum collector current (100 mA versus 200 mA), higher breakdown voltage (45V versus 40V), lower transition frequency (100 MHz versus 300 MHz), and higher saturation voltage (600 mV versus 300 mV). Substitution is appropriate only for applications where the reduced current and frequency specifications are acceptable.

Q: What are the advantages of PMST3904,115 and PMST3904,135 over MMBT3904T-TP?

A: The PMST3904,115 and PMST3904,135 provide increased power dissipation capability (200 mW versus 150 mW) while maintaining identical electrical specifications. Both parts carry automotive-grade qualification (AEC-Q101). The SOT-323 package is mechanically smaller than SOT-523. These parts are suitable for applications requiring enhanced thermal performance or automotive compliance.

Q: Is MMBT3904TT1G compatible with MMBT3904T-TP?

A: MMBT3904TT1G is electrically equivalent to MMBT3904T-TP with identical collector current (200 mA), breakdown voltage (40V), saturation voltage (300 mV), hFE (100 minimum), and transition frequency (300 MHz). The primary difference is packaging: MMBT3904TT1G uses SC-75 (SOT-416) format with doubled power dissipation (300 mW). The SC-75 package is larger than SOT-523 and requires PCB layout verification.

Q: When should MMBT2222AT-7-F or MMBT4401T-7-F be selected?

A: MMBT2222AT-7-F and MMBT4401T-7-F are suitable for applications requiring higher collector current (600 mA) than the MMBT3904T-TP (200 mA). Both parts maintain 40V breakdown voltage and 300 MHz (MMBT2222AT-7-F) or 250 MHz (MMBT4401T-7-F) transition frequency. Higher saturation voltage must be considered in circuit design. Both parts carry automotive qualification (AEC-Q101).

Q: What compliance certifications apply to substitute parts?

A: All substitute parts listed are ROHS3 compliant and REACH unaffected. Automotive-qualified parts (MMBT3904T-7-F, PMST3904,115, PMST3904,135, MMBT2222AT-7-F, MMBT4401T-7-F) carry AEC-Q101 qualification. Commercial-grade parts (MMBT3904T-TP, BC847 series, MMBT3904TT1G, UMT3904T106) do not carry automotive qualification. Selection should be based on application requirements and supply chain specifications.

Q: Are there package compatibility considerations for SOT-523 substitutes?

A: All parts designated SOT-523 share identical pin configuration and footprint dimensions, enabling direct PCB substitution without layout modification. Parts packaged in SOT-323 (SC-70) or SC-75 (SOT-416) require PCB layout verification due to different footprint dimensions. Mechanical clearance and thermal considerations must be evaluated before implementation.

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