MMBTA56 Equivalent & Substitute Parts

Part Overview

The MMBTA56 is a PNP bipolar junction transistor manufactured by onsemi in SOT-23-3 surface mount packaging. This device is rated for 80 V collector-emitter breakdown voltage and 500 mA maximum collector current, with a maximum power dissipation of 350 mW. The MMBTA56 is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and production continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives within defined parameter tolerances.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	80	V
Current - Collector (Ic) (Max)	500	mA
Power - Max	350	mW
Frequency - Transition	50	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 100mA, 1V	—
Vce Saturation (Max) @ Ib, Ic	200mV @ 10mA, 100mA	—
Current - Collector Cutoff (Max)	100	nA
Operating Temperature Range	-55 to 150	°C
Package / Case	SOT-23-3 (TO-236-3, SC-59)	—
Mounting Type	Surface Mount	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MMBTA56 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters for Direct Equivalence:

Transistor Type: PNP
Voltage - Collector Emitter Breakdown (Max): 80 V
Current - Collector (Ic) (Max): 500 mA
DC Current Gain (hFE) (Min) @ Ic, Vce: 100 @ 100mA, 1V
Package / Case: SOT-23-3 (TO-236-3, SC-59)
Operating Temperature Range: -55°C to 150°C

Direct Equivalents maintain all critical parameters and are manufactured by onsemi or other qualified manufacturers. These parts are pin-compatible and electrically interchangeable with the MMBTA56.

Similar Parts share the same package and transistor type but differ in one or more electrical parameters (voltage rating, current rating, power dissipation, or frequency response). These parts are suitable only when the application requirements permit the parameter variations.

Parameter Comparison

Part Number	Manufacturer	Product Status	Vce(BR) Max (V)	Ic Max (mA)	Power Max (mW)	hFE Min @ Ic, Vce	Frequency (MHz)	Package	RoHS / Compliance
MMBTA56	onsemi	Obsolete	80	500	350	100 @ 100mA, 1V	50	SOT-23-3	REACH Unaffected
MMBTA56LT1G	onsemi	Active	80	500	225	100 @ 100mA, 1V	50	SOT-23-3	ROHS3 Compliant
MMBTA56LT3G	onsemi	Active	80	500	225	100 @ 100mA, 1V	50	SOT-23-3	ROHS3 Compliant
SMMBTA56LT1G	onsemi	Active	80	500	225	100 @ 100mA, 1V	50	SOT-23-3	ROHS3 Compliant, AEC-Q101
SMMBTA56LT3G	onsemi	Active	80	500	225	100 @ 100mA, 1V	50	SOT-23-3	ROHS3 Compliant, AEC-Q101
MMBTA56-7-F	Diodes Incorporated	Active	80	500	300	100 @ 100mA, 1V	50	SOT-23-3	ROHS3 Compliant, AEC-Q101
PMBTA56,215	Nexperia USA Inc.	Active	80	500	250	100 @ 100mA, 1V	50	SOT-23-3	ROHS3 Compliant, AEC-Q101
NSS12200LT1G	onsemi	Active	12	2000	460	250 @ 500mA, 2V	100	SOT-23-3	ROHS3 Compliant
NSS1C200LT1G	onsemi	Active	100	2000	490	120 @ 50mA, 2V	120	SOT-23-3	ROHS3 Compliant
NSS40200LT1G	onsemi	Active	40	2000	460	220 @ 500mA, 2V	100	SOT-23-3	ROHS3 Compliant
NSS60200LT1G	onsemi	Active	60	2000	460	150 @ 500mA, 2V	100	SOT-23-3	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (Recommended for Drop-In Replacement):

The MMBTA56LT1G, MMBTA56LT3G, SMMBTA56LT1G, and SMMBTA56LT3G are direct electrical equivalents of the MMBTA56. All four parts maintain the 80 V breakdown voltage, 500 mA collector current, and 100 hFE minimum gain specification. These parts are manufactured by onsemi and are in active production status.

MMBTA56LT1G and MMBTA56LT3G differ only in packaging format (Cut Tape & Digi-Reel versus Tape & Reel). Both are ROHS3 compliant and suitable for commercial and industrial applications.

SMMBTA56LT1G and SMMBTA56LT3G are automotive-grade variants qualified to AEC-Q101 standard. These parts are required for automotive applications and provide enhanced reliability assurance. Packaging format differs between the two variants.

Alternative Manufacturers (Equivalent Specifications):

MMBTA56-7-F (Diodes Incorporated) and PMBTA56,215 (Nexperia USA Inc.) are functionally equivalent to the MMBTA56 with identical voltage and current ratings. Both are ROHS3 compliant and AEC-Q101 qualified. MMBTA56-7-F is available in Cut Tape & Digi-Reel packaging. PMBTA56,215 is supplied in Tape & Reel format.

Similar Parts (Application-Dependent Selection):

NSS12200LT1G, NSS1C200LT1G, NSS40200LT1G, and NSS60200LT1G are similar PNP transistors in SOT-23-3 packaging but with different electrical specifications. These parts are suitable only when application requirements permit higher collector current (2 A) and different voltage ratings. NSS12200LT1G operates at 12 V maximum, NSS40200LT1G at 40 V, NSS60200LT1G at 60 V, and NSS1C200LT1G at 100 V. All are in active production and ROHS3 compliant.

Frequently Asked Questions (FAQ)

Q: Can MMBTA56LT1G replace MMBTA56 in existing designs?

A: Yes. MMBTA56LT1G is a direct electrical equivalent with identical voltage, current, and gain specifications. The part is pin-compatible and requires no circuit modifications. MMBTA56LT1G is in active production, addressing the obsolescence of the original MMBTA56.

Q: What is the difference between MMBTA56LT1G and MMBTA56LT3G?

A: Both parts are electrically identical. The difference is packaging format: MMBTA56LT1G is supplied in Cut Tape & Digi-Reel format, while MMBTA56LT3G is supplied in Tape & Reel format. Selection depends on assembly equipment and procurement requirements.

Q: When should SMMBTA56LT1G or SMMBTA56LT3G be used instead of standard MMBTA56LT variants?

A: SMMBTA56LT1G and SMMBTA56LT3G are automotive-grade parts qualified to AEC-Q101 standard. These variants are required for automotive applications, medical devices, and other applications requiring enhanced reliability and traceability. Electrical specifications are identical to the standard MMBTA56LT variants.

Q: Are MMBTA56-7-F and PMBTA56,215 direct replacements?

A: Yes. Both parts meet the MMBTA56 electrical specifications (80 V, 500 mA, 100 hFE minimum). MMBTA56-7-F is manufactured by Diodes Incorporated and PMBTA56,215 by Nexperia USA Inc. Both are ROHS3 compliant and AEC-Q101 qualified. Selection between these and onsemi variants depends on supplier availability and procurement strategy.

Q: Can NSS60200LT1G replace MMBTA56?

A: NSS60200LT1G is not a direct replacement. While both are PNP transistors in SOT-23-3 packaging, NSS60200LT1G has a 60 V maximum breakdown voltage (versus 80 V for MMBTA56) and 2 A maximum collector current (versus 500 mA). NSS60200LT1G is suitable only for applications where the lower voltage rating and higher current capability are acceptable.

Q: What does ROHS3 compliance mean?

A: ROHS3 compliance indicates the part meets the Restriction of Hazardous Substances Directive 3 requirements, restricting the use of specific hazardous materials including lead, cadmium, and mercury. All active MMBTA56 equivalents listed are ROHS3 compliant.

Q: What is AEC-Q101 qualification?

A: AEC-Q101 is an automotive electronics council qualification standard for discrete semiconductors. Parts bearing this qualification have undergone enhanced testing and reliability screening required for automotive applications. SMMBTA56LT1G, SMMBTA56LT3G, MMBTA56-7-F, and PMBTA56,215 are AEC-Q101 qualified.

Q: Does power dissipation difference between MMBTA56 (350 mW) and MMBTA56LT1G (225 mW) affect compatibility?

A: The lower power rating of MMBTA56LT1G reflects improved thermal characteristics of the active part. In applications where the MMBTA56 operated within its 225 mW limit, MMBTA56LT1G is fully compatible. Applications requiring sustained operation above 225 mW should use MMBTA56-7-F (300 mW) or PMBTA56,215 (250 mW) for additional thermal margin.

Q: Are all listed equivalents available in the same packaging?

A: All direct equivalents and alternatives use SOT-23-3 (TO-236-3, SC-59) surface mount packaging. Packaging format (Cut Tape & Digi-Reel, Tape & Reel) varies by part number and supplier. Verify packaging format matches assembly equipment requirements before procurement.

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