MMBTA56-7 PNP Bipolar Junction Transistor Equivalent & Substitute Parts

Part Overview

The MMBTA56-7 is a PNP bipolar junction transistor manufactured by Diodes Incorporated, designed for surface mount applications in the SOT-23-3 package. This device operates at 80 V collector-emitter breakdown voltage with a maximum collector current of 500 mA and 300 mW power dissipation. The MMBTA56-7 is classified as discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Collector Current (Max)	500	mA
Collector-Emitter Breakdown Voltage (Max)	80	V
Vce Saturation (Max)	250	mV @ 10mA, 100mA
Collector Cutoff Current (Max)	100	nA
DC Current Gain (hFE Min)	100	@ 100mA, 1V
Power Dissipation (Max)	300	mW
Transition Frequency	50	MHz
Operating Temperature Range	-55 to 150	°C
Package Type	SOT-23-3 (TO-236-3, SC-59)	—
Mounting Type	Surface Mount	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution of the MMBTA56-7 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Transistor polarity: PNP
Collector current rating: 500 mA maximum
Collector-emitter breakdown voltage: 80 V maximum
Vce saturation: 250 mV @ 10mA, 100mA
DC current gain (hFE): minimum 100 @ 100mA, 1V
Package type: SOT-23-3 (TO-236-3, SC-59)
Mounting type: Surface Mount

Flexible Parameters (may vary within acceptable ranges):

Power dissipation: 225 mW to 350 mW
Transition frequency: 50 MHz to 180 MHz
Operating temperature maximum: 150°C to 175°C
Collector cutoff current: 50 nA to 500 nA

Substitute parts are grouped into three categories based on their relationship to the MMBTA56-7: parametric equivalents from the same manufacturer with identical electrical specifications, direct equivalents from alternative manufacturers meeting all core parameters, and upgraded alternatives offering enhanced performance characteristics while maintaining backward compatibility.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	Vce Sat mV	hFE (Min)	Power mW	Freq MHz	Temp °C	Package	Status	RoHS
MMBTA56-7	Diodes Inc.	500	80	250 @ 10mA, 100mA	100 @ 100mA, 1V	300	50	-55 to 150	SOT-23-3	Discontinued	Non-compliant
MMBTA56-7-F	Diodes Inc.	500	80	250 @ 10mA, 100mA	100 @ 100mA, 1V	300	50	-55 to 150	SOT-23-3	Active	Compliant
MMBTA56LT3G	onsemi	500	80	250 @ 10mA, 100mA	100 @ 100mA, 1V	225	50	-55 to 150	SOT-23-3	Active	Compliant
SMMBTA56LT1G	onsemi	500	80	250 @ 10mA, 100mA	100 @ 100mA, 1V	225	50	-55 to 150	SOT-23-3	Active	Compliant
SMMBTA56LT3G	onsemi	500	80	250 @ 10mA, 100mA	100 @ 100mA, 1V	225	50	-55 to 150	SOT-23-3	Active	Compliant
SMBTA56E6433HTMA1	Infineon	500	80	250 @ 10mA, 100mA	100 @ 100mA, 1V	330	100	150	SOT-23-3	Last Time Buy	Compliant
2SB1198KT146Q	Rohm Semiconductor	500	80	500 @ 50mA, 500mA	120 @ 100mA, 3V	200	180	150	SOT-23-3	Active	Compliant
CMPTA56 TR PBFREE	Central Semiconductor	500	80	250 @ 10mA, 100mA	100 @ 100mA, 1V	350	100	-65 to 175	SOT-23-3	Active	Compliant
MMBTA56-TP	Micro Commercial Co	500	80	250 @ 10mA, 100mA	100 @ 100mA, 1V	225	50	-55 to 150	SOT-23-3	Active	Compliant
PMBTA56,215	Nexperia USA Inc.	500	80	250 @ 10mA, 100mA	100 @ 100mA, 1V	250	50	150	SOT-23-3	Active	Compliant
PMBTA56,235	Nexperia USA Inc.	500	80	250 @ 10mA, 100mA	100 @ 100mA, 1V	250	50	150	SOT-23-3	Active	Compliant

Engineering Selection Recommendations

Primary Substitute (Parametric Equivalent): MMBTA56-7-F from Diodes Incorporated is the direct parametric equivalent with identical electrical specifications and the same manufacturer base product number. This part is currently in active production status with RoHS3 compliance, addressing the discontinuation of the original MMBTA56-7. The MMBTA56-7-F maintains all core electrical parameters and automotive AEC-Q101 qualification.

Secondary Substitutes (Direct Equivalents): MMBTA56LT3G, SMMBTA56LT1G, and SMMBTA56LT3G from onsemi meet all mandatory electrical parameters with identical Vce saturation and DC current gain specifications. These parts carry automotive AEC-Q101 qualification and RoHS3 compliance. Power dissipation is reduced to 225 mW, which remains within acceptable operating margins for applications designed for the 300 mW MMBTA56-7.

MMBTA56-TP from Micro Commercial Co and PMBTA56,215 and PMBTA56,235 from Nexperia USA Inc. provide full electrical equivalence with active product status and RoHS3 compliance. The Nexperia parts carry automotive AEC-Q101 qualification.

Alternative Substitutes (Enhanced Performance): CMPTA56 TR PBFREE from Central Semiconductor Corp offers increased power dissipation (350 mW) and transition frequency (100 MHz) while maintaining all core electrical parameters. Operating temperature range extends to 175°C maximum.

SMBTA56E6433HTMA1 from Infineon provides doubled transition frequency (100 MHz) and increased power dissipation (330 mW). This part is designated Last Time Buy status.

2SB1198KT146Q from Rohm Semiconductor offers significantly higher transition frequency (180 MHz) and reduced power dissipation (200 mW). Vce saturation specification differs at 500 mV @ 50mA, 500mA, and DC current gain is specified at 120 @ 100mA, 3V.

Compliance Considerations: All recommended substitutes are RoHS3 compliant. For automotive applications requiring AEC-Q101 qualification, select from MMBTA56-7-F, SMMBTA56LT1G, SMMBTA56LT3G, PMBTA56,215, or PMBTA56,235.

Frequently Asked Questions (FAQ)

Q: Can MMBTA56-7 be directly replaced with MMBTA56-7-F? A: Yes. MMBTA56-7-F is the parametric equivalent with identical electrical specifications, same manufacturer, and same base product number. The primary difference is product status (active versus discontinued) and RoHS compliance (compliant versus non-compliant).

Q: What is the difference between MMBTA56LT3G and SMMBTA56LT1G? A: Both parts are from onsemi with identical electrical specifications. SMMBTA56LT1G carries automotive AEC-Q101 qualification, while MMBTA56LT3G does not. Both are RoHS3 compliant and in active production.

Q: Are onsemi MMBTA56 variants suitable for automotive applications? A: SMMBTA56LT1G and SMMBTA56LT3G carry AEC-Q101 qualification and are suitable for automotive applications. MMBTA56LT3G does not carry this qualification.

Q: How does 2SB1198KT146Q differ from the MMBTA56-7? A: 2SB1198KT146Q maintains identical collector current, voltage, and package specifications. Differences include higher transition frequency (180 MHz versus 50 MHz), lower power dissipation (200 mW versus 300 mW), and different Vce saturation specification (500 mV @ 50mA, 500mA versus 250 mV @ 10mA, 100mA). DC current gain is specified at different test conditions (120 @ 100mA, 3V versus 100 @ 100mA, 1V).

Q: Is CMPTA56 TR PBFREE a suitable replacement? A: Yes. CMPTA56 TR PBFREE meets all mandatory electrical parameters with identical Vce saturation and DC current gain. It offers enhanced power dissipation (350 mW) and transition frequency (100 MHz). Operating temperature range extends to 175°C. RoHS3 compliance is confirmed.

Q: What packaging options are available for substitutes? A: All substitute parts use SOT-23-3 (TO-236-3, SC-59) surface mount package, maintaining mechanical and electrical compatibility with the MMBTA56-7. Packaging formats vary between Cut Tape (CT), Digi-Reel, and Tape & Reel (TR) options depending on manufacturer and part number.

Q: Which substitute offers the best high-frequency performance? A: 2SB1198KT146Q provides the highest transition frequency at 180 MHz, compared to 50 MHz for the MMBTA56-7. CMPTA56 TR PBFREE and SMBTA56E6433HTMA1 offer 100 MHz transition frequency.

Q: Are all substitutes RoHS3 compliant? A: Yes. All listed substitute parts are RoHS3 compliant. The original MMBTA56-7 is RoHS non-compliant.

Q: Can SMBTA56E6433HTMA1 be used in new designs? A: SMBTA56E6433HTMA1 is designated Last Time Buy status, indicating limited availability. While it meets all electrical parameters and offers enhanced performance, it is not recommended for new designs requiring long-term supply assurance.

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