MMBT3904T-13 Equivalent & Substitute Parts

Part Overview

The MMBT3904T-13 is an NPN bipolar junction transistor manufactured by Diodes Incorporated in SOT-523 surface mount packaging. This component is rated for 40 V collector-emitter breakdown voltage, 200 mA maximum collector current, and 150 mW power dissipation. The device operates across a temperature range of -55°C to 150°C and is qualified to AEC-Q101 automotive standards.

The MMBT3904T-13 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this transistor specification.

Substiute Parts

MMBT3904T-13

Diodes IncorporatedIn Stock: 1126MMBT3904T-13 Datasheet

Current PartRFQ

CMUT3904 BK PBFREE

Central Semiconductor CorpIn Stock: 1078CMUT3904 BK PBFREE Datasheet

MFR RecommendedRFQ

MMBT3904AT

Good-Ark SemiconductorIn Stock: 6363MMBT3904AT Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MMBT3904T-13 are selected based on electrical and mechanical parameter compatibility. The following criteria determine substitution eligibility:

Primary Electrical Parameters:

• Transistor type: NPN
• Maximum collector current: 200 mA
• Collector-emitter breakdown voltage: 40 V
• DC current gain (hFE): 100 minimum at specified conditions
• Transition frequency: 300 MHz
• Saturation voltage: 300 mV @ 5 mA, 50 mA

Mechanical Parameters:

• Package type: SOT-523 surface mount
• Mounting type: Surface mount

Compliance Parameters:

• RoHS3 compliance
• MSL rating: 1 (Unlimited)

Substitute parts must maintain all primary electrical parameters and package compatibility. Variations in maximum power rating and operating temperature range are permitted when the substitute part meets or exceeds the specified electrical performance and maintains the same package footprint.

Parameter Comparison

Engineering Selection Recommendations

CMUT3904 BK PBFREE (Central Semiconductor Corp)

This part is classified as an MFR recommended manufacturer substitute. It maintains all critical electrical parameters identical to the MMBT3904T-13, including collector current, breakdown voltage, saturation voltage, current gain, and transition frequency. The CMUT3904 BK PBFREE offers enhanced power dissipation capability (250 mW versus 150 mW) and an extended lower operating temperature limit (-65°C versus -55°C). Both parts are ROHS3 compliant with MSL rating 1. The active product status of the CMUT3904 BK PBFREE ensures ongoing availability and supply chain support.

MMBT3904AT (Good-Ark Semiconductor)

This part is classified as a parametric equivalent. It matches all primary electrical specifications of the MMBT3904T-13, including collector current, breakdown voltage, saturation voltage, current gain, and transition frequency. The MMBT3904AT maintains identical power dissipation (150 mW) and package configuration (SOT-523). Both parts are ROHS3 compliant with MSL rating 1. The active product status of the MMBT3904AT provides reliable supply availability. This part is suitable for direct replacement in applications where the original specification parameters are required.

Both substitute parts are qualified for surface mount assembly and maintain compatibility with existing PCB designs and manufacturing processes.

Frequently Asked Questions (FAQ)

Q: Can the CMUT3904 BK PBFREE be used as a direct replacement for the MMBT3904T-13?

A: Yes. The CMUT3904 BK PBFREE maintains all critical electrical parameters required for the MMBT3904T-13 application, including collector current (200 mA), breakdown voltage (40 V), saturation voltage (300 mV), current gain (100 minimum), and transition frequency (300 MHz). Both parts use identical SOT-523 surface mount packaging. The CMUT3904 BK PBFREE offers additional benefits including higher power dissipation capability and extended temperature range.

Q: Can the MMBT3904AT be used as a direct replacement for the MMBT3904T-13?

A: Yes. The MMBT3904AT is electrically and mechanically equivalent to the MMBT3904T-13. All primary electrical parameters match exactly, including collector current, breakdown voltage, saturation voltage, current gain, and transition frequency. Both parts are packaged in SOT-523 surface mount configuration and are ROHS3 compliant.

Q: What is the difference between the CMUT3904 BK PBFREE and the MMBT3904AT?

A: Both parts are suitable substitutes for the MMBT3904T-13. The primary difference is power dissipation rating: the CMUT3904 BK PBFREE is rated for 250 mW maximum power, while the MMBT3904AT is rated for 150 mW maximum power (matching the original part). The CMUT3904 BK PBFREE also provides an extended lower operating temperature limit of -65°C compared to the MMBT3904T-13 specification of -55°C. Selection between these parts depends on application power requirements and thermal operating conditions.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. The MMBT3904T-13, CMUT3904 BK PBFREE, and MMBT3904AT are all ROHS3 compliant. All parts carry MSL rating 1 (Unlimited moisture sensitivity level).

Q: Do the substitute parts maintain the same package footprint?

A: Yes. All substitute parts use SOT-523 surface mount packaging, ensuring compatibility with existing PCB designs and assembly processes. No layout modifications are required for substitution.

Q: What is the product status of the substitute parts?

A: Both the CMUT3904 BK PBFREE and MMBT3904AT are classified as active products, ensuring ongoing manufacturing availability and supply chain support. The original MMBT3904T-13 is classified as obsolete.