MMBT3904-13 Equivalent & Substitute Parts

Part Overview

The MMBT3904-13 is an NPN bipolar junction transistor manufactured by Diodes Incorporated, designed for general-purpose switching and amplification applications. This device features a 40 V collector-emitter breakdown voltage, 200 mA maximum collector current, and 300 MHz transition frequency in a surface mount SOT-23-3 package. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	40	V
Current - Collector (Ic) (Max)	200	mA
Frequency - Transition	300	MHz
Power - Max	310	mW
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 10mA, 1V	—
Vce Saturation (Max) @ Ib, Ic	300mV @ 5mA, 50mA	—
Operating Temperature Range	-55 to 150	°C
Package / Case	SOT-23-3 (TO-236-3, SC-59)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the MMBT3904-13 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Transistor type: NPN
Collector-emitter breakdown voltage: 40 V (minimum requirement)
Maximum collector current: 200 mA
Transition frequency: 300 MHz
DC current gain (hFE): 100 @ 10mA, 1V
Vce saturation: 300mV @ 5mA, 50mA

Mechanical Equivalence Criteria:

Package type: SOT-23-3 (TO-236-3, SC-59)
Mounting type: Surface Mount
Moisture sensitivity level: 1 (Unlimited)

Compliance Criteria:

RoHS3 compliance
REACH unaffected status
ECCN: EAR99

Substitute parts must satisfy all electrical parameters at or above the specified values and maintain identical package and mounting specifications. Power dissipation ratings may exceed the original specification without affecting substitution validity. Operating temperature range may be extended but must not be reduced below the original range.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	Frequency MHz	Power mW	hFE @ 10mA, 1V	Vce Sat mV	Temp Range °C	Package	Status
MMBT3904-13	Diodes Incorporated	200	40	300	310	100	300 @ 5mA, 50mA	-55 to 150	SOT-23-3	Obsolete
CMPT3904G TR PBFREE	Central Semiconductor Corp	200	40	300	350	100	300 @ 5mA, 50mA	-65 to 150	SOT-23	Active
MMBT3904-G	Comchip Technology	200	40	300	200	100	300 @ 5mA, 50mA	-55 to 150	SOT-23-3	Active
MMBT3904LT3G	onsemi	200	40	300	300	100	300 @ 5mA, 50mA	-55 to 150	SOT-23-3	Active
MMST3904T146	Rohm Semiconductor	200	40	300	200	100	300 @ 5mA, 50mA	-55 to 150	SMT3	Active
PMBT3904,215	Nexperia USA Inc.	200	40	300	250	100	300 @ 5mA, 50mA	-55 to 150	TO-236AB	Active
SST3904T116	Rohm Semiconductor	200	40	300	350	100	300 @ 5mA, 50mA	-55 to 150	SST3	Active
BCW60CT116	Rohm Semiconductor	200	32	125	—	260 @ 2mA, 5V	—	—	SST3	Active

Engineering Selection Recommendations

Primary Substitutes (Full Electrical and Mechanical Equivalence):

The following parts provide complete substitution for the MMBT3904-13 with active product status and full compliance certification:

MMBT3904LT3G (onsemi): Maintains identical electrical specifications, operating temperature range, and SOT-23-3 package. Highest inventory availability (360,300 units). Recommended for direct replacement in new designs and production.
MMBT3904-G (Comchip Technology): Identical electrical specifications and SOT-23-3 package with -55°C to 150°C operating range. Extensive inventory (94,715 units). Suitable for direct substitution.
PMBT3904,215 (Nexperia USA Inc.): Meets all electrical requirements with automotive-grade qualification (AEC-Q101) and TO-236AB package variant. Recommended for automotive applications requiring AEC-Q101 certification.

Secondary Substitutes (Electrical Equivalence with Package Variants):

CMPT3904G TR PBFREE (Central Semiconductor Corp): Matches all electrical parameters with extended lower operating temperature (-65°C). SOT-23 package variant. Suitable where extended temperature range is required.
MMST3904T146 (Rohm Semiconductor): Electrical equivalent with SMT3 package variant. Maintains all critical parameters including saturation voltage and current gain.
SST3904T116 (Rohm Semiconductor): Electrical equivalent with SST3 package variant and higher power rating (350 mW). Suitable for applications with increased thermal margin requirements.

Not Recommended:

BCW60CT116 (Rohm Semiconductor): Reduced collector-emitter breakdown voltage (32 V vs. 40 V), lower transition frequency (125 MHz vs. 300 MHz), and different DC current gain characteristics. Does not meet electrical equivalence criteria.

Frequently Asked Questions (FAQ)

Q: Can MMBT3904-13 be replaced with any of the listed substitutes in existing designs?

A: Direct replacement is possible only with parts maintaining identical electrical specifications and package compatibility. MMBT3904LT3G, MMBT3904-G, and PMBT3904,215 provide full equivalence. Parts with package variants (CMPT3904G, MMST3904T146, SST3904T116) require PCB layout verification to confirm footprint compatibility with SOT-23-3 land patterns.

Q: What is the difference between SOT-23-3, SMT3, and SST3 packages?

A: All three are surface mount packages for three-terminal devices with identical electrical pin configurations and similar physical dimensions. SOT-23-3 (TO-236-3, SC-59) is the standard designation. SMT3 and SST3 are manufacturer-specific package designations for equivalent form factors. Footprint compatibility must be verified against PCB design specifications.

Q: Why is BCW60CT116 listed if it is not recommended?

A: BCW60CT116 is included for reference as a manufacturer-recommended alternative in certain datasheets. However, it does not meet the electrical equivalence criteria for the MMBT3904-13 due to reduced breakdown voltage (32 V) and lower transition frequency (125 MHz). Selection of BCW60CT116 requires circuit redesign and performance validation.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original part's environmental certification requirements.

Q: What is the significance of the operating temperature range difference in CMPT3904G?

A: CMPT3904G extends the lower operating temperature limit to -65°C compared to the standard -55°C. This provides additional thermal margin for applications in extreme cold environments. The upper limit remains at 150°C. This extended range does not affect substitution validity for standard temperature applications.

Q: Can package variants be used interchangeably on the same PCB?

A: Package variants (SOT-23-3, SMT3, SST3, TO-236AB) have identical electrical pin configurations but may have minor physical dimension differences. PCB footprint compatibility must be verified before substitution. Consult package datasheets and PCB design files to confirm land pattern alignment.

Q: Which substitute offers the best inventory availability?

A: MMBT3904LT3G (onsemi) provides the highest inventory availability at 360,300 units, followed by SST3904T116 (Rohm Semiconductor) at 125,100 units. Both are active products with full electrical equivalence.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message