MMST6428T146 Equivalent & Substitute Parts

Part Overview

The MMST6428T146 is a surface mount NPN bipolar junction transistor manufactured by Rohm Semiconductor, rated for 50 V collector-emitter breakdown voltage and 200 mA maximum collector current. This device is packaged in SMD3 (SOT-23-3) configuration and operates at frequencies up to 700 MHz with a maximum power dissipation of 200 mW.

The MMST6428T146 carries a product status designation of "Not For New Designs," indicating that Rohm Semiconductor has discontinued active development and support for this component. This status necessitates identification of functionally equivalent alternatives from active product lines to ensure design continuity, supply chain reliability, and long-term component availability for new applications and production runs.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	50	V
Current - Collector (Ic) (Max)	200	mA
Power - Max	200	mW
Frequency - Transition	700	MHz
Vce Saturation (Max) @ Ib, Ic	600 mV @ 5 mA, 100 mA	—
DC Current Gain (hFE) (Min) @ Ic, Vce	250 @ 1 mA, 5 V	—
Current - Collector Cutoff (Max)	100	nA
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
Operating Temperature (Max)	125	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MMST6428T146 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: NPN (required match)
Voltage - Collector Emitter Breakdown (Max): 50 V (minimum requirement)
Current - Collector (Ic) (Max): 200 mA (minimum requirement)
Package / Case: TO-236-3, SC-59, SOT-23-3 (mechanical compatibility)
Mounting Type: Surface Mount (required match)
RoHS Status: ROHS3 Compliant (regulatory requirement)
Moisture Sensitivity Level (MSL): 1 (Unlimited) (handling requirement)

Secondary Electrical Parameters (Performance Considerations):

Power - Max: 200 mW or greater
Frequency - Transition: 700 MHz or greater
Vce Saturation (Max) @ Ib, Ic: 600 mV @ 5 mA, 100 mA or lower
DC Current Gain (hFE) (Min) @ Ic, Vce: 250 or greater

Substitute parts are grouped into two categories: Direct Equivalents (matching all primary and secondary parameters) and Functional Alternatives (matching primary criteria with acceptable variations in secondary parameters for specific application contexts).

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	Power (Max) mW	Frequency (Transition) MHz	Vce Sat (Max) mV	hFE (Min)	Package	Product Status
MMST6428T146	Rohm Semiconductor	200	50	200	700	600	250	SOT-23-3	Not For New Designs
CMPT6428 TR PBFREE	Central Semiconductor Corp	200	50	350	700	600	250	SOT-23-3	Active
MMBT6428LT1G	onsemi	200	50	225	700	600	250	SOT-23-3	Active
2PD601BRL,215	Nexperia USA Inc.	200	50	250	250	250	210	SOT-23-3	Active
2PD601BSL,215	NXP Semiconductors	200	50	250	250	250	290	SOT-23-3	Active
2DC2412R-7	Diodes Incorporated	150	50	300	180	400	180	SOT-23-3	Active
NSVMMBT6429LT1G	onsemi	200	45	300	700	600	500	SOT-23-3	Active
NXP3875YR	Nexperia USA Inc.	150	50	200	80	250	120	SOT-23-3	Active
2PD601ARL,215	Nexperia USA Inc.	100	50	250	100	250	210	SOT-23-3	Active
2PD601ART,235	Nexperia USA Inc.	100	50	250	100	250	210	SOT-23-3	Active
2PD601ASL,215	Nexperia USA Inc.	100	50	250	100	250	290	SOT-23-3	Active

Engineering Selection Recommendations

Tier 1: Direct Equivalents (Recommended Primary Substitutes)

The following parts satisfy all primary and secondary electrical parameters while maintaining active product status:

CMPT6428 TR PBFREE (Central Semiconductor Corp): Matches all electrical specifications with enhanced power dissipation capability (350 mW vs. 200 mW). Active product status with extended operating temperature range (-65°C to 150°C). Identical packaging and compliance certifications.
MMBT6428LT1G (onsemi): Matches all electrical specifications with identical 700 MHz transition frequency and 600 mV saturation voltage. Active product status with extended operating temperature range (-55°C to 150°C). Highest inventory availability (23,300 pcs).

Tier 2: Functional Alternatives (Application-Dependent Substitutes)

The following parts meet primary substitution criteria with acceptable secondary parameter variations:

2PD601BRL,215 and 2PD601BSL,215 (Nexperia USA Inc.): Match 200 mA collector current and 50 V breakdown voltage. Reduced transition frequency (250 MHz vs. 700 MHz) and lower saturation voltage (250 mV vs. 600 mV). Automotive grade with AEC-Q101 qualification. Suitable for applications not requiring high-frequency performance.
2DC2412R-7 (Diodes Incorporated): Reduced collector current (150 mA vs. 200 mA) and transition frequency (180 MHz vs. 700 MHz). Lower saturation voltage (400 mV vs. 600 mV). Suitable for current-limited applications below 150 mA.

Tier 3: Limited Substitutes (Restricted Application Use)

NSVMMBT6429LT1G (onsemi): Reduced breakdown voltage (45 V vs. 50 V). Acceptable only for applications with maximum operating voltage below 45 V.
NXP3875YR, 2PD601ARL,215, 2PD601ART,235, 2PD601ASL,215 (Nexperia USA Inc.): Reduced collector current (100-150 mA vs. 200 mA). Acceptable only for applications with maximum current requirements below 100-150 mA.

All recommended substitutes maintain ROHS3 compliance, MSL Level 1 (Unlimited) moisture sensitivity rating, and SOT-23-3 package compatibility.

Frequently Asked Questions (FAQ)

Q: Can CMPT6428 TR PBFREE directly replace MMST6428T146 in all applications?

A: Yes, CMPT6428 TR PBFREE meets or exceeds all electrical specifications of MMST6428T146. The higher power dissipation rating (350 mW vs. 200 mW) provides additional thermal margin. Identical saturation voltage, transition frequency, and current gain specifications ensure functional equivalence. Packaging and compliance certifications are identical.

Q: What is the primary difference between MMBT6428LT1G and CMPT6428 TR PBFREE?

A: Both parts match all electrical specifications of MMST6428T146. The primary difference is manufacturer (onsemi vs. Central Semiconductor Corp) and power dissipation rating (225 mW vs. 350 mW). MMBT6428LT1G has significantly higher inventory availability. Selection between these two depends on supply chain preference and thermal design margin requirements.

Q: Why do 2PD601BRL,215 and 2PD601BSL,215 have lower saturation voltage than MMST6428T146?

A: Lower saturation voltage (250 mV vs. 600 mV) reflects different transistor design characteristics. These parts are suitable for applications where lower saturation voltage is beneficial or neutral. Applications requiring specific saturation voltage matching should use CMPT6428 or MMBT6428LT1G.

Q: Can 2DC2412R-7 be used as a substitute if my application requires 200 mA collector current?

A: No. 2DC2412R-7 has a maximum collector current rating of 150 mA, which is insufficient for applications requiring 200 mA. Using this part in a 200 mA application would exceed its rated specifications and create reliability risk.

Q: Is NSVMMBT6429LT1G acceptable for a 50 V application?

A: No. NSVMMBT6429LT1G has a maximum breakdown voltage of 45 V, which is below the 50 V requirement. This part is acceptable only for applications with maximum operating voltage of 45 V or lower.

Q: What is the significance of the "Not For New Designs" status on MMST6428T146?

A: This designation indicates that Rohm Semiconductor has discontinued active support and development for this component. New designs should incorporate one of the active substitute parts listed in Tier 1 to ensure long-term supply availability, technical support, and compliance with current manufacturing standards.

Q: Are all substitute parts available in the same packaging as MMST6428T146?

A: Yes. All substitute parts listed are packaged in TO-236-3, SC-59, or SOT-23-3 configurations, which are mechanically and electrically equivalent. Surface mount assembly processes require no modification.

Q: Do all substitute parts meet RoHS3 compliance?

A: Yes. All substitute parts listed maintain ROHS3 compliance status, meeting current environmental and regulatory requirements for electronic component manufacturing and use.

Q: Which substitute part has the highest inventory availability?

A: MMBT6428LT1G (onsemi) has the highest inventory availability at 23,300 pieces in stock, followed by 2PD601BSL,215 (NXP Semiconductors) at 15,300 pieces.

Q: Can automotive-grade parts (2PD601BRL,215, 2PD601BSL,215) be used in non-automotive applications?

A: Yes. Automotive-grade parts with AEC-Q101 qualification meet or exceed specifications for non-automotive applications. These parts are acceptable for any application within their electrical ratings.

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