MMST5551-7 Equivalent & Substitute Parts

Part Overview

The MMST5551-7 is an NPN bipolar junction transistor manufactured by Diodes Incorporated, rated for 160V collector-emitter breakdown voltage and 0.2A maximum collector current. This surface mount device in SC70-3 packaging is designed for general-purpose switching and amplification applications. The part is active in production status with ROHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified to address packaging format variations, manufacturer alternatives, and inventory availability while maintaining electrical compatibility within specified parameter ranges.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	160	V
Current - Collector (Ic) (Max)	0.2	A
Power - Max	200	mW
Frequency - Transition	300	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	80 @ 10mA, 5V	—
Operating Temperature Range	-55 to 150	°C
Package / Case	SC-70, SOT-323	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MMST5551-7 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: NPN
Voltage - Collector Emitter Breakdown (Max): 160V minimum
Current - Collector (Ic) (Max): 0.2A minimum
Power - Max: 200mW
Frequency - Transition: 300MHz
DC Current Gain (hFE): 80 minimum @ 10mA, 5V
Package / Case: SC-70 or SOT-323
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Packaging Variants: The MMST5551-7 is supplied in Cut Tape (CT) & Digi-Reel® format. Direct substitutes include the same base product in alternative packaging formats (Tape & Reel) from the same manufacturer. The MMST5551-7-F represents the Tape & Reel variant of the identical electrical specification.

Manufacturer Alternatives: Parts from alternative manufacturers (Nexperia USA Inc., Micro Commercial Co) are included when electrical parameters meet or exceed the minimum requirements and package compatibility is maintained.

Parameter Tolerance: Substitute parts with collector current ratings of 0.3A (300mA) are acceptable as they exceed the 0.2A requirement. Voltage ratings of 160V or higher are acceptable. Parts with lower voltage ratings (140V) are listed but represent a reduced safety margin and require application-specific evaluation.

Parameter Comparison

Part Number	Manufacturer	Ic (Max)	Vce Breakdown (Max)	Power (Max)	Frequency	hFE (Min)	Package	Packaging Format	Product Status	Inventory
MMST5551-7	Diodes Incorporated	0.2A	160V	200mW	300MHz	80 @ 10mA, 5V	SC-70, SOT-323	Cut Tape (CT) & Digi-Reel®	Active	1738 Pcs
MMST5551-7-F	Diodes Incorporated	0.2A	160V	200mW	300MHz	80 @ 10mA, 5V	SC-70, SOT-323	Tape & Reel (TR)	Active	19191 Pcs
MMST5551-TP	Micro Commercial Co	0.2A	160V	200mW	300MHz	80 @ 10mA, 5V	SC-70, SOT-323	Tape & Reel (TR)	Active	66200 Pcs
PMST5551,115	Nexperia USA Inc.	0.3A	160V	200mW	300MHz	80 @ 10mA, 5V	SC-70, SOT-323	Tape & Reel (TR)	Active	6300 Pcs
PMST5550,115	Nexperia USA Inc.	0.3A	140V	200mW	300MHz	60 @ 10mA, 5V	SC-70, SOT-323	Tape & Reel (TR)	Active	33262 Pcs

Engineering Selection Recommendations

Direct Equivalent (Identical Electrical Specifications): MMST5551-7-F and MMST5551-TP are direct electrical equivalents to the MMST5551-7. Both maintain 160V breakdown voltage, 0.2A collector current rating, and identical DC current gain specifications. Selection between these parts is determined by packaging format requirements and inventory availability. MMST5551-7-F is supplied by the original manufacturer (Diodes Incorporated) in Tape & Reel format. MMST5551-TP is supplied by Micro Commercial Co with significantly higher inventory (66200 Pcs).

Enhanced Current Rating Alternative: PMST5551,115 (Nexperia USA Inc.) provides identical voltage and frequency specifications with an increased collector current rating of 0.3A. This part is AEC-Q101 qualified for automotive applications and carries Automotive grade designation. This substitute is suitable for applications where additional current margin is beneficial. Inventory availability is 6300 Pcs.

Reduced Voltage Alternative: PMST5550,115 (Nexperia USA Inc.) operates at 140V maximum breakdown voltage compared to the 160V specification of the MMST5551-7. This represents a 20V reduction in voltage rating and a reduced DC current gain (60 vs. 80 @ 10mA, 5V). This part is suitable only for applications where the 140V rating is sufficient and the lower gain is acceptable. AEC-Q101 qualification and Automotive grade are provided. Inventory availability is 33262 Pcs.

All substitute parts maintain ROHS3 compliance, unlimited moisture sensitivity rating (MSL 1), and active production status.

Frequently Asked Questions (FAQ)

Q: Can MMST5551-7-F be used as a direct replacement for MMST5551-7?

A: Yes. MMST5551-7-F is electrically identical to MMST5551-7, with the same 160V breakdown voltage, 0.2A collector current, and DC current gain specifications. The difference is packaging format: MMST5551-7-F is supplied in Tape & Reel (TR) format while MMST5551-7 is supplied in Cut Tape (CT) & Digi-Reel® format. Verify your assembly equipment compatibility with the packaging format before selection.

Q: Is PMST5551,115 a suitable substitute?

A: PMST5551,115 is electrically compatible with MMST5551-7 for applications where the 0.3A collector current rating is acceptable. Both parts share identical 160V breakdown voltage and 300MHz transition frequency. PMST5551,115 provides additional current margin and carries AEC-Q101 automotive qualification. Verify that your application does not require the specific DC current gain characteristics of the original part, as both maintain the 80 minimum specification.

Q: Why is PMST5550,115 listed as a substitute if it has a lower voltage rating?

A: PMST5550,115 is listed as a similar part but with reduced electrical specifications. The 140V breakdown voltage is 20V lower than the MMST5551-7 specification, and the DC current gain is reduced to 60 minimum. This part is suitable only for applications where the 140V rating provides sufficient margin and the lower gain is acceptable. Application-specific evaluation is required before selection.

Q: What is the difference between Cut Tape and Tape & Reel packaging?

A: Cut Tape (CT) & Digi-Reel® format supplies individual components on tape that is cut to length. Tape & Reel (TR) format supplies components on continuous tape wound on a reel for automated assembly equipment. The electrical specifications are identical; packaging format selection depends on your assembly process and equipment capabilities.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), matching the compliance profile of the MMST5551-7.

Q: Which substitute has the highest inventory availability?

A: MMST5551-TP (Micro Commercial Co) has the highest inventory availability at 66200 Pcs, followed by PMST5550,115 at 33262 Pcs. MMST5551-7-F has 19191 Pcs available.

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