MMSTA55-7 Equivalent & Substitute Parts

Part Overview

The MMSTA55-7 is a PNP bipolar junction transistor manufactured by Diodes Incorporated, rated for 60V collector-emitter breakdown voltage and 0.5A maximum collector current. This surface mount device in SC70-3 packaging is designed for small-signal switching and amplification applications. The part is currently active in production with ROHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts are identified to address packaging format variations, alternative sourcing requirements, and equivalent electrical performance across different manufacturers. The substitution analysis is based strictly on electrical ratings, package compatibility, and product status.

Key Parameters

Parameter	MMSTA55-7	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	60	V
Current - Collector (Ic) (Max)	0.5	A
Power - Max	200	mW
Package / Case	SC-70, SOT-323	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Product Status	Active	—

Substitute Part Grouping Explanation

Substitute parts for the MMSTA55-7 are classified based on the following electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: PNP
Voltage - Collector Emitter Breakdown (Max): 60V or higher
Current - Collector (Ic) (Max): 0.5A or higher
Package / Case: SC-70 or SOT-323
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Grouping Categories:

Direct Equivalent (Packaging Variant): Parts with identical electrical specifications but different packaging format (Tape & Reel vs. Cut Tape).

Upgrade Equivalent (Enhanced Qualification): Parts meeting or exceeding electrical specifications with automotive-grade qualification (AEC-Q101).

Similar Performance (Electrical Tolerance Variations): Parts with equivalent voltage and current ratings but differing in secondary parameters such as transition frequency, saturation voltage, or current gain specifications.

Extended Performance (Higher Current or Frequency): Parts exceeding the 0.5A current rating or providing higher transition frequency while maintaining voltage compatibility.

Parameter Comparison

Part Number	Manufacturer	Ic (Max)	Vce Breakdown (Max)	Power (Max)	Frequency	Package	Product Status	Grade
MMSTA55-7	Diodes Incorporated	500 mA	60 V	200 mW	50 MHz	SC-70, SOT-323	Active	Standard
MMSTA55-7-F	Diodes Incorporated	500 mA	60 V	200 mW	50 MHz	SC-70, SOT-323	Active	Standard
PMSTA55,115	NXP USA Inc.	500 mA	60 V	200 mW	50 MHz	SC-70, SOT-323	Active	Automotive (AEC-Q101)
2SA2088T106Q	Rohm Semiconductor	500 mA	60 V	200 mW	400 MHz	SC-70, SOT-323	Not For New Designs	Standard
BC807-25W RFG	Taiwan Semiconductor Corporation	500 mA	45 V	200 mW	80 MHz	SC-70, SOT-323	Active	Standard
BC807-40W,135	Nexperia USA Inc.	500 mA	45 V	200 mW	80 MHz	SC-70, SOT-323	Active	Automotive (AEC-Q101)
CMST2907A TR PBFREE	Central Semiconductor Corp	600 mA	60 V	275 mW	200 MHz	SC-70, SOT-323	Active	Standard
PMST2907A,115	Nexperia USA Inc.	600 mA	60 V	200 mW	200 MHz	SC-70, SOT-323	Active	Automotive (AEC-Q101)
SBC807-25WT1G	onsemi	500 mA	45 V	460 mW	100 MHz	SC-70, SOT-323	Active	Automotive (AEC-Q101)
SBC807-40WT1G	onsemi	500 mA	45 V	460 mW	100 MHz	SC-70, SOT-323	Active	Automotive (AEC-Q101)

Engineering Selection Recommendations

Direct Equivalent Selection:

MMSTA55-7-F (Diodes Incorporated) is a direct electrical equivalent with identical specifications. This part differs only in packaging format (Tape & Reel vs. Cut Tape) and is suitable for high-volume production environments requiring reel packaging.

Automotive-Grade Upgrade:

PMSTA55,115 (NXP USA Inc.) provides equivalent electrical performance with automotive-grade qualification (AEC-Q101). This part is appropriate for applications requiring automotive compliance or enhanced reliability screening.

BC807-40W,135 (Nexperia USA Inc.) offers automotive-grade qualification with identical current and power ratings. The reduced voltage rating (45V vs. 60V) requires circuit verification for applications operating near the 60V specification limit.

Extended Performance Options:

CMST2907A TR PBFREE (Central Semiconductor Corp) and PMST2907A,115 (Nexperia USA Inc.) provide higher collector current (600 mA) and transition frequency (200 MHz) while maintaining 60V voltage rating. PMST2907A,115 includes automotive qualification. These parts are suitable for applications requiring higher current capacity or faster switching performance.

Restricted Status:

2SA2088T106Q (Rohm Semiconductor) carries "Not For New Designs" status and should not be selected for new product development despite equivalent electrical specifications.

Voltage Derating Consideration:

BC807-25W RFG and SBC807 series parts (both variants) are rated for 45V maximum collector-emitter breakdown voltage, which is 15V lower than the MMSTA55-7 specification. These parts are suitable only for applications where the circuit voltage does not exceed 45V.

Frequently Asked Questions (FAQ)

Q: Can MMSTA55-7-F be used as a direct replacement for MMSTA55-7?

A: Yes. MMSTA55-7-F is electrically identical to MMSTA55-7. The difference is packaging format: MMSTA55-7-F is supplied in Tape & Reel format while MMSTA55-7 is supplied in Cut Tape format. Both parts are manufactured by Diodes Incorporated and meet identical electrical specifications.

Q: What is the difference between PMSTA55,115 and MMSTA55-7?

A: PMSTA55,115 is manufactured by NXP USA Inc. (formerly Nexperia) and provides identical electrical specifications to MMSTA55-7. The key difference is automotive-grade qualification (AEC-Q101), which indicates enhanced reliability screening and qualification for automotive applications. PMSTA55,115 is suitable for applications requiring automotive compliance.

Q: Why do BC807-25W RFG and BC807-40W,135 have lower voltage ratings?

A: BC807-25W RFG and BC807-40W,135 are rated for 45V maximum collector-emitter breakdown voltage compared to 60V for MMSTA55-7. These parts are suitable only for circuits where the maximum applied voltage does not exceed 45V. For applications requiring 60V operation, MMSTA55-7, MMSTA55-7-F, or PMSTA55,115 must be used.

Q: Can CMST2907A or PMST2907A,115 be used in place of MMSTA55-7?

A: CMST2907A and PMST2907A,115 have higher collector current ratings (600 mA vs. 500 mA) and higher transition frequency (200 MHz vs. 50 MHz). These parts are electrically compatible and can be used as upgrades where higher performance is beneficial. PMST2907A,115 includes automotive qualification. Both parts maintain the 60V voltage rating and SC-70/SOT-323 package compatibility.

Q: What does "Not For New Designs" mean for 2SA2088T106Q?

A: "Not For New Designs" indicates that Rohm Semiconductor has discontinued active development and marketing of this part. While the part may still be available in inventory, it should not be selected for new product development. Alternative parts with active status should be used instead.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this reference are ROHS3 compliant, matching the compliance status of MMSTA55-7.

Q: What is the significance of AEC-Q101 qualification?

A: AEC-Q101 is an automotive industry qualification standard that specifies enhanced reliability testing and screening procedures. Parts with AEC-Q101 qualification (PMSTA55,115, BC807-40W,135, SBC807-25WT1G, SBC807-40WT1G, and PMST2907A,115) are suitable for automotive applications and applications requiring higher reliability assurance.

Q: Can SBC807-25WT1G or SBC807-40WT1G be used in 60V circuits?

A: No. SBC807-25WT1G and SBC807-40WT1G are rated for 45V maximum collector-emitter breakdown voltage. These parts are not suitable for circuits operating at 60V. For 60V operation, use MMSTA55-7, MMSTA55-7-F, PMSTA55,115, CMST2907A, or PMST2907A,115.

Q: What is the difference between SBC807-25WT1G and SBC807-40WT1G?

A: Both parts are manufactured by onsemi with identical voltage (45V), current (500 mA), and frequency (100 MHz) ratings. The difference is in DC current gain: SBC807-25WT1G has minimum hFE of 160 at 100mA/1V, while SBC807-40WT1G has minimum hFE of 250 at 100mA/1V. Both include automotive qualification (AEC-Q101).

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