MMSTA56-7 Equivalent & Substitute Parts

Part Overview

The MMSTA56-7 is a PNP bipolar junction transistor manufactured by Diodes Incorporated, rated for 80V collector-emitter breakdown voltage and 0.5A maximum collector current. This surface mount device in SC-70-3 packaging is designed for general-purpose switching and amplification applications. The part is active in production status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are identified to address packaging preferences, manufacturer availability, and specific application requirements while maintaining electrical and mechanical compatibility within the defined parameter range.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	80	V
Current - Collector (Ic) (Max)	0.5	A
Vce Saturation (Max) @ Ib, Ic	250mV @ 10mA, 100mA	—
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 100mA, 1V	—
Frequency - Transition	50	MHz
Power - Max	200	mW
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the MMSTA56-7 are grouped based on strict electrical and mechanical parameter compatibility. All substitute devices maintain the following core specifications:

Critical Matching Parameters:

Transistor Type: PNP
Voltage - Collector Emitter Breakdown: 80V (maximum)
Current - Collector (Ic): 0.5A (maximum)
Vce Saturation: 250mV @ 10mA, 100mA
Current - Collector Cutoff: 100nA (maximum)
DC Current Gain (hFE): 100 minimum @ 100mA, 1V
Frequency - Transition: 50MHz or higher
Operating Temperature: -55°C to 150°C minimum
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Packaging Variations: Substitutes are available in SC-70-3 (SOT-323) and SOT-23-3 (TO-236) packages. Package selection depends on PCB layout requirements and mechanical constraints. SOT-23-3 packages offer larger form factor with increased power dissipation capability, while SC-70-3 packages provide compact footprint.

Manufacturer Variants: Multiple manufacturers produce equivalent devices meeting these specifications, including Diodes Incorporated, Nexperia USA Inc., onsemi, and Central Semiconductor Corp. All listed substitutes maintain active production status and full compliance with RoHS3 and REACH requirements.

Parameter Comparison

Part Number	Manufacturer	Package	Ic (Max)	Vce(br)	hFE (Min)	Fт (MHz)	P (Max)	Temp Range	Status
MMSTA56-7	Diodes Inc.	SC-70-3	500 mA	80 V	100	50	200 mW	-55 to 150°C	Active
MMSTA56-7-F	Diodes Inc.	SOT-323	500 mA	80 V	100	50	200 mW	-55 to 150°C	Active
PMSTA56,115	Nexperia USA	SOT-323	500 mA	80 V	100	50	200 mW	-55 to 150°C	Active
CMPTA56 TR PBFREE	Central Semi.	SOT-23	500 mA	80 V	100	100	350 mW	-65 to 175°C	Active
MMBTA56LT1G	onsemi	SOT-23-3	500 mA	80 V	100	50	225 mW	-55 to 150°C	Active
MMBTA56LT3G	onsemi	SOT-23-3	500 mA	80 V	100	50	225 mW	-55 to 150°C	Active
MMBTA56WT1G	onsemi	SC-70-3	500 mA	80 V	100	50	150 mW	-55 to 150°C	Active

Engineering Selection Recommendations

Direct Equivalent (Same Package): The MMBTA56WT1G (onsemi) is a direct equivalent to the MMSTA56-7, maintaining identical SC-70-3 packaging and electrical specifications. Both parts are active in production with ROHS3 compliance and MSL 1 rating. Selection between these parts depends on manufacturer preference and supply chain availability.

Packaging Alternatives (SOT-323): The MMSTA56-7-F (Diodes Incorporated) and PMSTA56,115 (Nexperia USA Inc.) provide SOT-323 packaging alternatives. These parts maintain all critical electrical parameters while offering different form factor. The PMSTA56,115 includes AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade components.

Enhanced Performance Options (SOT-23-3): The MMBTA56LT1G and MMBTA56LT3G (onsemi) offer SOT-23-3 packaging with increased power dissipation (225 mW) compared to the original 200 mW specification. These parts maintain all electrical specifications and are suitable for applications requiring larger thermal margin.

Extended Performance (SOT-23): The CMPTA56 TR PBFREE (Central Semiconductor Corp) provides enhanced specifications including 100MHz transition frequency (versus 50MHz) and 350 mW power rating. Extended operating temperature range (-65°C to 175°C) supports demanding thermal environments. This part is suitable for applications requiring higher frequency performance or extended temperature operation.

All listed substitutes maintain active production status, ROHS3 compliance, and unlimited moisture sensitivity level (MSL 1).

Frequently Asked Questions (FAQ)

Q: Can I substitute MMSTA56-7 with MMBTA56WT1G? A: Yes. The MMBTA56WT1G is a direct equivalent maintaining identical SC-70-3 packaging, 80V breakdown voltage, 500mA collector current, and all electrical specifications. Both parts are active in production with ROHS3 compliance.

Q: What is the difference between SC-70-3 and SOT-323 packages? A: SC-70-3 and SOT-323 are equivalent package designations for the same physical form factor. MMSTA56-7-F and PMSTA56,115 use SOT-323 designation while maintaining identical mechanical and electrical compatibility.

Q: Can I use CMPTA56 TR PBFREE as a substitute? A: Yes, with design considerations. The CMPTA56 TR PBFREE maintains all critical electrical parameters (80V, 500mA, hFE 100) but offers enhanced specifications: 100MHz transition frequency (versus 50MHz), 350mW power rating (versus 200mW), and extended temperature range (-65°C to 175°C). The SOT-23 package is larger than SC-70-3. Use this part when higher frequency performance or thermal margin is required.

Q: Is PMSTA56,115 suitable for automotive applications? A: Yes. The PMSTA56,115 carries AEC-Q101 automotive qualification and is rated for automotive-grade applications. It maintains all electrical specifications of the MMSTA56-7 while providing automotive-specific reliability assurance.

Q: What are the packaging options available? A: Three package options are available: SC-70-3 (SOT-323) for compact footprint, SOT-23-3 (TO-236) for moderate footprint with increased power dissipation, and SOT-23 for larger footprint with maximum power dissipation. Package selection depends on PCB layout constraints and thermal requirements.

Q: Do all substitutes have the same moisture sensitivity level? A: Yes. All listed substitutes maintain MSL 1 (Unlimited) rating, identical to the MMSTA56-7. No special moisture handling precautions are required for any of these parts.

Q: Can I interchange MMBTA56LT1G and MMBTA56LT3G? A: Yes. Both parts are functionally equivalent onsemi devices in SOT-23-3 packaging with identical electrical specifications. The difference is packaging format: LT1G is Cut Tape & Digi-Reel, while LT3G is Tape & Reel. Selection depends on supply chain and packaging preference.

Q: Are all substitutes RoHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH Unaffected status, identical to the MMSTA56-7.

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