MMBT3904L RFG Equivalent & Substitute Parts

Part Overview

The MMBT3904L RFG is an NPN bipolar junction transistor manufactured by Taiwan Semiconductor Corporation in SOT-23 surface mount packaging. This component is classified as obsolete, though 194,524 pieces remain in stock as new original inventory. The MMBT3904L RFG serves general-purpose switching and amplification applications in low-power circuits requiring 40 V collector-emitter breakdown voltage and 200 mA maximum collector current.

Due to the obsolete product status, identifying equivalent and substitute parts is necessary for design continuity, long-term supply chain planning, and new production runs. Active alternatives with identical or superior electrical characteristics are available from multiple manufacturers.

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	300 mV @ 5 mA, 50 mA	—
Current - Collector Cutoff (Max)	50	nA
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 10 mA, 1 V	—
Power - Max	300	mW
Frequency - Transition	250	MHz
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	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the MMBT3904L RFG are classified into two categories based on electrical parameter alignment:

Parametric Equivalents share all critical electrical specifications with the main part: 40 V collector-emitter breakdown voltage, 200 mA maximum collector current, 300 mV saturation voltage at specified bias conditions, 100 minimum DC current gain, and identical operating temperature range. These parts differ only in manufacturer, packaging format (Tape & Reel versus Cut Tape), or product status (Active versus Obsolete). Parametric equivalents include MMBT3904 RFG (Taiwan Semiconductor Corporation, Active status) and MMBT3904 (EVVO Semi, Active status).

Similar Parts maintain the same transistor type (NPN), package family (SOT-23), and mounting method (Surface Mount), with electrical parameters that fall within acceptable operating ranges for most applications. However, these parts exhibit variations in one or more key parameters: transition frequency (300 MHz versus 250 MHz), maximum power dissipation (200 mW to 300 mW), or collector-emitter breakdown voltage (32 V versus 40 V). Similar parts include MMBT3904-7-F (Diodes Incorporated), MMBT3904-HF (Comchip Technology), MMBT3904_R1_00001 (Panjit International Inc.), MMBT3904LT1G (onsemi), MMBT3904LT3G (onsemi), SMMBT3904LT3G (onsemi), and BCW60DT116 (Rohm Semiconductor).

Substitution eligibility is determined by: (1) matching transistor type (NPN), (2) collector-emitter breakdown voltage equal to or greater than 40 V, (3) maximum collector current equal to or greater than 200 mA, (4) saturation voltage within 300 mV at specified bias points, (5) DC current gain minimum of 100 or greater, (6) operating temperature range encompassing −55 to 150 °C, and (7) SOT-23 surface mount package compatibility.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Ic (Max) mA	Vce Breakdown (Max) V	Vce Sat (Max) mV	hFE (Min)	Power (Max) mW	Frequency (Transition) MHz	Product Status	Packaging
MMBT3904L RFG	Taiwan Semiconductor Corporation	200	40	300	100	300	250	Obsolete	Tape & Reel (TR)
MMBT3904 RFG	Taiwan Semiconductor Corporation	200	40	300	100	300	250	Active	Tape & Reel (TR)
MMBT3904	EVVO Semi	200	40	300	100	200	300	Active	Cut Tape (CT) & Digi-Reel®
MMBT3904-7-F	Diodes Incorporated	200	40	300	100	300	300	Active	Cut Tape (CT) & Digi-Reel®
MMBT3904-HF	Comchip Technology	200	40	300	100	200	300	Active	Tape & Reel (TR)
MMBT3904_R1_00001	Panjit International Inc.	200	40	300	100	225	300	Active	Tape & Reel (TR)
MMBT3904LT1G	onsemi	200	40	300	100	300	300	Active	Cut Tape (CT) & Digi-Reel®
MMBT3904LT3G	onsemi	200	40	300	100	300	300	Active	Cut Tape (CT) & Digi-Reel®
SMMBT3904LT3G	onsemi	200	40	300	100	300	300	Active	Cut Tape (CT) & Digi-Reel®
BCW60DT116	Rohm Semiconductor	200	32	—	380	—	125	Active	—

Engineering Selection Recommendations

Parametric Equivalent Selection

MMBT3904 RFG (Taiwan Semiconductor Corporation, Active) is the primary parametric equivalent. This part maintains identical electrical specifications to the MMBT3904L RFG while offering active product status, ensuring continued availability and manufacturing support. Both parts are supplied in Tape & Reel packaging and comply with ROHS3 and REACH requirements.

MMBT3904 (EVVO Semi, Active) is a secondary parametric equivalent with identical core electrical parameters. This part differs in maximum power dissipation (200 mW versus 300 mW) and transition frequency (300 MHz versus 250 MHz), representing enhanced performance characteristics. EVVO Semi supplies this part in Cut Tape & Digi-Reel® format with significantly higher inventory availability (1,205,400 pieces).

Similar Part Selection for Enhanced Performance

MMBT3904-7-F (Diodes Incorporated, Active) offers identical electrical specifications to the main part with the addition of automotive-grade qualification (AEC-Q101). This part is suitable for applications requiring automotive reliability standards and is available in Cut Tape & Digi-Reel® packaging.

MMBT3904LT1G and MMBT3904LT3G (onsemi, Active) provide identical electrical specifications with 300 MHz transition frequency and 300 mW power rating. Both parts carry active product status and are available in Cut Tape & Digi-Reel® packaging with substantial inventory levels (605,100 and 360,300 pieces respectively).

SMMBT3904LT3G (onsemi, Active) is an automotive-qualified variant (AEC-Q101) with identical electrical specifications to MMBT3904LT3G. This part is suitable for automotive applications requiring qualified components.

Limited Substitution Consideration

BCW60DT116 (Rohm Semiconductor, Active) is classified as a similar part with reduced collector-emitter breakdown voltage (32 V versus 40 V). This part is suitable only for applications where the 40 V specification is not a critical design requirement. The higher DC current gain (380 minimum versus 100 minimum) and lower transition frequency (125 MHz versus 250 MHz) represent significant parameter deviations.

All recommended substitutes comply with ROHS3 and maintain MSL 1 (Unlimited) moisture sensitivity classification, ensuring compatibility with standard manufacturing and storage practices.

Frequently Asked Questions (FAQ)

Q: Can MMBT3904 RFG directly replace MMBT3904L RFG in existing designs?

A: Yes. MMBT3904 RFG is a parametric equivalent with identical electrical specifications. Both parts share the same 40 V collector-emitter breakdown voltage, 200 mA maximum collector current, 300 mV saturation voltage, 100 minimum DC current gain, and 250 MHz transition frequency. The primary difference is product status: MMBT3904 RFG is active while MMBT3904L RFG is obsolete. Both are supplied in Tape & Reel packaging by Taiwan Semiconductor Corporation.

Q: What is the difference between MMBT3904 (EVVO Semi) and MMBT3904 RFG (Taiwan Semiconductor Corporation)?

A: Both are parametric equivalents with identical core electrical specifications. EVVO Semi's MMBT3904 offers enhanced transition frequency (300 MHz versus 250 MHz) and is supplied in Cut Tape & Digi-Reel® packaging rather than Tape & Reel. Maximum power dissipation is 200 mW versus 300 mW. EVVO Semi maintains significantly higher inventory (1,205,400 pieces). Selection depends on packaging format requirements and power dissipation margin needs.

Q: Are onsemi MMBT3904LT1G and MMBT3904LT3G interchangeable?

A: Yes. Both onsemi parts are parametric equivalents with identical electrical specifications: 40 V collector-emitter breakdown, 200 mA maximum collector current, 300 mW power rating, and 300 MHz transition frequency. Both are supplied in Cut Tape & Digi-Reel® packaging. The primary difference is inventory availability: MMBT3904LT1G has 605,100 pieces in stock while MMBT3904LT3G has 360,300 pieces.

Q: Can SMMBT3904LT3G replace MMBT3904LT3G?

A: Yes. SMMBT3904LT3G is an automotive-qualified variant (AEC-Q101) of MMBT3904LT3G with identical electrical specifications. Both parts share 40 V collector-emitter breakdown voltage, 200 mA maximum collector current, 300 mW power rating, and 300 MHz transition frequency. SMMBT3904LT3G is suitable for applications requiring automotive-grade components.

Q: Is MMBT3904-7-F suitable for automotive applications?

A: Yes. MMBT3904-7-F is automotive-qualified (AEC-Q101) and manufactured by Diodes Incorporated. This part maintains identical electrical specifications to the main part: 40 V collector-emitter breakdown voltage, 200 mA maximum collector current, 300 mV saturation voltage, and 100 minimum DC current gain. Transition frequency is enhanced to 300 MHz. The part is supplied in Cut Tape & Digi-Reel® packaging.

Q: Can BCW60DT116 replace MMBT3904L RFG?

A: BCW60DT116 is classified as a similar part with reduced collector-emitter breakdown voltage (32 V versus 40 V). This part is suitable only for applications where the 40 V specification is not a critical design requirement. The higher DC current gain (380 minimum versus 100 minimum) and lower transition frequency (125 MHz versus 250 MHz) represent significant parameter deviations. Use BCW60DT116 only when application voltage requirements are confirmed below 32 V.

Q: What packaging formats are available for MMBT3904 substitutes?

A: Substitutes are supplied in two packaging formats: Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel®. Tape & Reel format is offered by Taiwan Semiconductor Corporation (MMBT3904 RFG), Comchip Technology (MMBT3904-HF), and Panjit International Inc. (MMBT3904_R1_00001). Cut Tape & Digi-Reel® format is offered by EVVO Semi (MMBT3904), Diodes Incorporated (MMBT3904-7-F), and onsemi (MMBT3904LT1G, MMBT3904LT3G, SMMBT3904LT3G). Selection depends on production equipment and tape handling requirements.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All parametric and similar substitutes listed are ROHS3 compliant. All parts maintain MSL 1 (Unlimited) moisture sensitivity classification, ensuring compatibility with standard manufacturing, storage, and handling practices without special environmental controls.

Q: What is the primary reason to transition from MMBT3904L RFG to an active substitute?

A: MMBT3904L RFG is classified as obsolete. Although 194,524 pieces remain in stock as new original inventory, long-term supply cannot be guaranteed. Active substitutes such as MMBT3904 RFG (Taiwan Semiconductor Corporation) or MMBT3904LT1G (onsemi) ensure continued availability for future production runs, design revisions, and long-term product support.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message