MMST8098T146 Equivalent & Substitute Parts

Part Overview

The MMST8098T146 is an NPN bipolar junction transistor manufactured by Rohm Semiconductor, rated for 60 V collector-emitter breakdown voltage and 200 mA maximum collector current. This device is packaged in SMT3 (TO-236-3, SC-59, SOT-23-3) surface mount configuration with 350 mW power dissipation capability and 350 MHz transition frequency. The part is designated as "Not For New Designs" by the manufacturer, indicating end-of-life status. Identification of equivalent and substitute parts is necessary for design continuity, inventory management, and sourcing alternatives that meet the same electrical and mechanical specifications.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	60	V
Current - Collector (Ic) (Max)	200	mA
Power - Max	350	mW
Frequency - Transition	350	MHz
Vce Saturation (Max) @ Ib, Ic	300mV @ 10mA, 100mA	—
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 1mA, 5V	—
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

Substitution of the MMST8098T146 is determined by electrical and mechanical compatibility within the following criteria:

Primary Substitution Parameters:

Transistor Type: NPN (required match)
Package / Case: TO-236-3, SC-59, SOT-23-3 (required match for mechanical compatibility)
Mounting Type: Surface Mount (required match)
Voltage - Collector Emitter Breakdown (Max): Must equal or exceed 60 V
Current - Collector (Ic) (Max): Must equal or exceed 200 mA
Power - Max: Must equal or exceed 350 mW
Frequency - Transition: Must equal or exceed 350 MHz

Secondary Compatibility Factors:

RoHS Status: ROHS3 Compliant (environmental compliance)
Moisture Sensitivity Level: MSL 1 (Unlimited) preferred for handling consistency
Vce Saturation and DC Current Gain: Must fall within acceptable operating ranges

Substitute parts are grouped based on whether they meet all primary electrical parameters while maintaining mechanical compatibility. Parts that fall below the MMST8098T146 specifications in any primary parameter are classified as partial substitutes with application-dependent suitability.

Parameter Comparison

Part Number	Manufacturer	Voltage - Collector Emitter Breakdown (Max) [V]	Current - Collector (Ic) (Max) [mA]	Power - Max [mW]	Frequency - Transition [MHz]	Package / Case	Product Status	RoHS Status
MMST8098T146	Rohm Semiconductor	60	200	350	350	TO-236-3, SC-59, SOT-23-3	Not For New Designs	ROHS3 Compliant
2SC2712-BL,LF	Toshiba Semiconductor and Storage	50	150	150	80	TO-236-3, SC-59, SOT-23-3	Active	ROHS3 Compliant
2SC2712-GR,LF	Toshiba Semiconductor and Storage	50	150	150	80	TO-236-3, SC-59, SOT-23-3	Active	ROHS3 Compliant
2SC2712-OTE85LF	Toshiba Semiconductor and Storage	50	150	150	80	TO-236-3, SC-59, SOT-23-3	Active	ROHS3 Compliant
2SC2712-Y,LF	Toshiba Semiconductor and Storage	50	150	150	80	TO-236-3, SC-59, SOT-23-3	Active	ROHS3 Compliant
BC846,215	NXP USA Inc.	65	100	250	100	TO-236-3, SC-59, SOT-23-3	Active	Not specified
BC846A,215	Nexperia USA Inc.	65	100	250	100	TO-236-3, SC-59, SOT-23-3	Active	ROHS3 Compliant
BC846A-7-F	Diodes Incorporated	65	100	300	300	TO-236-3, SC-59, SOT-23-3	Active	ROHS3 Compliant
BC846ALT1G	onsemi	65	100	300	100	TO-236-3, SC-59, SOT-23-3	Active	ROHS3 Compliant
BC846AQ-7-F	Diodes Incorporated	65	100	310	300	TO-236-3, SC-59, SOT-23-3	Active	ROHS3 Compliant
BC846B,215	Nexperia USA Inc.	65	100	250	100	TO-236-3, SC-59, SOT-23-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

Full Electrical Equivalents: No substitute parts listed meet all primary electrical parameters of the MMST8098T146. The MMST8098T146 requires minimum specifications of 60 V breakdown voltage, 200 mA collector current, 350 mW power dissipation, and 350 MHz transition frequency. All listed substitute parts fall below at least one of these requirements.

Partial Substitutes for Reduced-Specification Applications: The 2SC2712 series (2SC2712-BL,LF; 2SC2712-GR,LF; 2SC2712-OTE85LF; 2SC2712-Y,LF) from Toshiba Semiconductor and Storage are active products with ROHS3 compliance. These devices are suitable for applications requiring lower voltage (50 V), lower current (150 mA), lower power (150 mW), and lower frequency (80 MHz) operation. All variants maintain TO-236-3 package compatibility and MSL 1 moisture sensitivity rating.

The BC846 series variants (BC846,215; BC846A,215; BC846A-7-F; BC846ALT1G; BC846AQ-7-F; BC846B,215) from NXP/Nexperia and Diodes Incorporated are active products with ROHS3 compliance. These devices provide 65 V breakdown voltage (exceeding the MMST8098T146 specification) but are limited to 100 mA collector current, 250–310 mW power dissipation, and 100–300 MHz transition frequency. The BC846A-7-F and BC846AQ-7-F variants from Diodes Incorporated offer 300 MHz transition frequency, approaching the MMST8098T146 specification.

Product Status Consideration: The MMST8098T146 is designated "Not For New Designs." All listed substitute parts carry "Active" product status, indicating ongoing manufacturer support and availability for new designs.

Compliance Status: All substitute parts are ROHS3 compliant. The MMST8098T146 is ROHS3 compliant with REACH Unaffected status. Most substitute parts maintain ROHS3 compliance and REACH Unaffected status where specified.

Frequently Asked Questions (FAQ)

Q: Can the 2SC2712 series directly replace the MMST8098T146? A: The 2SC2712 series shares the same TO-236-3 package and NPN transistor type. However, electrical specifications differ: the 2SC2712 series is rated for 50 V (versus 60 V), 150 mA (versus 200 mA), 150 mW (versus 350 mW), and 80 MHz (versus 350 MHz). Direct replacement is not suitable for applications requiring the full electrical specifications of the MMST8098T146. Substitution is application-dependent and requires verification that reduced electrical ratings are acceptable.

Q: Can the BC846 series replace the MMST8098T146? A: The BC846 series shares the same TO-236-3 package and NPN transistor type. The BC846 series provides higher voltage rating (65 V versus 60 V) but lower current capacity (100 mA versus 200 mA), lower power dissipation (250–310 mW versus 350 mW), and lower transition frequency (100–300 MHz versus 350 MHz). Direct replacement is not suitable for applications requiring 200 mA collector current or 350 MHz transition frequency. Substitution is application-dependent.

Q: Are all substitute parts available in the same packaging? A: Yes. All listed substitute parts are packaged in TO-236-3, SC-59, or SOT-23-3 configurations, which are mechanically equivalent. Specific supplier device packages vary (S-Mini, TO-236, TO-236AB, SOT-23-3), but all are compatible with standard TO-236-3 footprints used for the MMST8098T146.

Q: What is the difference between 2SC2712 variants? A: The 2SC2712 series variants (2SC2712-BL,LF; 2SC2712-GR,LF; 2SC2712-OTE85LF; 2SC2712-Y,LF) share identical electrical specifications. Differences are in packaging format (Tape & Reel versus Cut Tape & Digi-Reel) and DC current gain minimum specification (70 @ 2mA, 6V for most variants; 120 @ 2mA, 6V for 2SC2712-Y,LF). Selection depends on procurement and assembly requirements.

Q: What is the difference between BC846 variants? A: BC846 variants differ in DC current gain minimum specification and transition frequency. BC846A and BC846B variants specify 110 and 200 hFE (Min) respectively at 2mA, 5V. BC846A-7-F and BC846AQ-7-F from Diodes Incorporated offer 300 MHz transition frequency, compared to 100 MHz for most other variants. BC846AQ-7-F includes AEC-Q101 automotive qualification. Selection depends on gain requirements and frequency performance needs.

Q: Is the MMST8098T146 still available for purchase? A: The MMST8098T146 is designated "Not For New Designs" by Rohm Semiconductor. Inventory of 3155 pieces is reported as new original stock. For new designs, active substitute products such as the 2SC2712 series or BC846 series are recommended based on application requirements.

Q: What are the RoHS and REACH compliance statuses of substitute parts? A: All listed substitute parts are ROHS3 compliant. The 2SC2712 series and most BC846 variants carry REACH Unaffected status where specified. The MMST8098T146 is ROHS3 compliant and REACH Unaffected. Compliance status should be verified with the specific supplier for the selected part variant.

Q: Can I use a substitute part with lower electrical ratings in my application? A: Substitution with lower electrical ratings is application-dependent. If your circuit operates below the reduced ratings of the substitute part, it may function correctly. However, this requires detailed circuit analysis and verification. Consult application-specific datasheets and perform testing to confirm compatibility before production implementation.

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