MMBTA64 Equivalent & Substitute Parts

Part Overview

The MMBTA64 is a PNP Darlington bipolar junction transistor manufactured by onsemi, designed for surface mount applications in the SOT-23-3 package. This component operates at a maximum collector current of 1.2 A and collector-emitter breakdown voltage of 30 V, with a maximum power dissipation of 350 mW. The MMBTA64 is classified as an obsolete product, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility within the specified parameter ranges while offering active product status and current manufacturing availability.

Key Parameters

Parameter	MMBTA64	Unit
Transistor Type	PNP - Darlington	—
Current - Collector (Ic) (Max)	1.2	A
Voltage - Collector Emitter Breakdown (Max)	30	V
Vce Saturation (Max) @ Ib, Ic	1.5V @ 100µA, 100mA	—
Current - Collector Cutoff (Max)	100nA	—
DC Current Gain (hFE) (Min) @ Ic, Vce	20000 @ 100mA, 5V	—
Power - Max	350	mW
Frequency - Transition	125	MHz
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOT-23-3	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitute parts for the MMBTA64 are classified into two categories based on electrical parameter compatibility:

Direct Substitutes (Full Current Rating): Parts that maintain the maximum collector current specification of 1.2 A or higher, matching the primary electrical load-carrying capability of the MMBTA64. These parts are suitable for direct replacement in applications requiring the full 1.2 A current rating.

Reduced Current Substitutes (0.5 A Rating): Parts with maximum collector current ratings of 500 mA or 300 mA, which are suitable for applications where the circuit design operates below 500 mA. These substitutes maintain voltage, temperature, and package compatibility but operate at reduced current capacity.

Critical Parameters for Substitution:

Transistor Type: PNP - Darlington (mandatory)
Voltage - Collector Emitter Breakdown: minimum 30 V
Package / Case: SOT-23-3 or equivalent (TO-236-3, SC-59)
DC Current Gain (hFE): minimum 20000 @ 100mA, 5V
Operating Temperature Range: -55°C to 150°C (minimum)
Mounting Type: Surface Mount

Parameter Comparison

Part Number	Manufacturer	Ic (Max)	Vce Breakdown (Max)	Vce Sat @ Ib, Ic	hFE (Min)	Power (Max)	Frequency	Temp Range	Package	Status
MMBTA64	onsemi	1.2 A	30 V	1.5V @ 100µA, 100mA	20000 @ 100mA, 5V	350 mW	125 MHz	-55 to 150°C	SOT-23-3	Obsolete
BCV26	onsemi	1.2 A	30 V	1V @ 100µA, 100mA	20000 @ 100mA, 5V	350 mW	220 MHz	-55 to 150°C	SOT-23-3	Active
MMBTA64LT1G	onsemi	500 mA	30 V	1.5V @ 100µA, 100mA	20000 @ 100mA, 5V	225 mW	125 MHz	-55 to 150°C	SOT-23-3	Active
MMBTA64LT3G	onsemi	500 mA	30 V	1.5V @ 100µA, 100mA	20000 @ 100mA, 5V	225 mW	125 MHz	-55 to 150°C	SOT-23-3	Active
SMMBTA64LT1G	onsemi	500 mA	30 V	1.5V @ 100µA, 100mA	20000 @ 100mA, 5V	225 mW	125 MHz	-55 to 150°C	SOT-23-3	Active
2SB852KT146B	Rohm Semiconductor	300 mA	32 V	1.5V @ 400µA, 200mA	5000 @ 100mA, 5V	200 mW	200 MHz	-55 to 150°C	SOT-23-3	Active
BCV26,215	Nexperia USA Inc.	500 mA	30 V	1V @ 100µA, 100mA	20000 @ 100mA, 5V	250 mW	220 MHz	-55 to 150°C	SOT-23-3	Active
MMBTA64-7-F	Diodes Incorporated	500 mA	30 V	1.5V @ 100µA, 100mA	20000 @ 100mA, 5V	300 mW	125 MHz	-55 to 150°C	SOT-23-3	Active
MMBTA64-TP	Micro Commercial Co	500 mA	30 V	1.5V @ 100µA, 100mA	20000 @ 100mA, 5V	300 mW	125 MHz	-55 to 150°C	SOT-23-3	Active
PMBTA64,215	Nexperia USA Inc.	500 mA	30 V	1.5V @ 100µA, 100mA	20000 @ 100mA, 5V	250 mW	125 MHz	-55 to 150°C	SOT-23-3	Active

Engineering Selection Recommendations

Primary Direct Substitute: BCV26 (onsemi) is the recommended direct substitute for the MMBTA64. This part maintains identical maximum collector current (1.2 A), collector-emitter breakdown voltage (30 V), and operating temperature range (-55°C to 150°C). The BCV26 offers improved transition frequency (220 MHz versus 125 MHz) and lower saturation voltage (1V versus 1.5V), providing enhanced performance characteristics. The BCV26 is manufactured by onsemi, the original MMBTA64 manufacturer, ensuring design continuity and supply chain consistency. Product status is Active with substantial inventory availability.

Secondary Substitutes for Reduced Current Applications: When circuit design operates at collector currents below 500 mA, the following active alternatives are available:

MMBTA64LT1G (onsemi): Maintains onsemi manufacturing lineage with identical electrical characteristics to MMBTA64 except for reduced current rating (500 mA). Offers full temperature range support (-55°C to 150°C) and RoHS3 compliance.
MMBTA64-7-F (Diodes Incorporated): Provides AEC-Q101 automotive qualification with 500 mA current rating. Suitable for automotive-grade applications requiring component traceability and qualification documentation.
PMBTA64,215 (Nexperia USA Inc.): Offers AEC-Q101 automotive qualification and Nexperia manufacturing heritage. Suitable for automotive applications with 500 mA current rating.
BCV26,215 (Nexperia USA Inc.): Automotive-qualified variant with AEC-Q101 certification, 500 mA current rating, and improved transition frequency (220 MHz).

Limited Current Applications: The 2SB852KT146B (Rohm Semiconductor) is suitable only for applications requiring maximum 300 mA collector current. This part exhibits reduced DC current gain (5000 versus 20000) and should be selected only when current requirements do not exceed 300 mA and the reduced gain is acceptable for circuit operation.

All recommended substitutes maintain SOT-23-3 package compatibility, RoHS3 compliance, and REACH unaffected status. Selection should be based on specific circuit current requirements and any automotive qualification mandates.

Frequently Asked Questions (FAQ)

Q: Can BCV26 directly replace MMBTA64 in all applications?

A: Yes, BCV26 is a direct replacement for MMBTA64 in applications requiring the full 1.2 A collector current rating. Both parts share identical maximum collector current, collector-emitter breakdown voltage, and operating temperature range. BCV26 offers superior performance with higher transition frequency and lower saturation voltage.

Q: What is the difference between MMBTA64LT1G and MMBTA64LT3G?

A: Both parts are functionally equivalent with identical electrical specifications. The primary difference is inventory availability and manufacturing lot designation. Both are active products with 500 mA maximum collector current rating and are suitable for applications operating below 500 mA.

Q: Are MMBTA64-7-F and PMBTA64,215 suitable for automotive applications?

A: Yes, both parts carry AEC-Q101 automotive qualification. MMBTA64-7-F is manufactured by Diodes Incorporated and PMBTA64,215 is manufactured by Nexperia USA Inc. Both are suitable for automotive-grade designs requiring component qualification documentation.

Q: Why does 2SB852KT146B have lower DC current gain than other substitutes?

A: The 2SB852KT146B exhibits a minimum DC current gain of 5000 @ 100mA, 5V, compared to 20000 for the MMBTA64 and most substitutes. This reduced gain is a characteristic of the Rohm Semiconductor design. This part is suitable only for applications where the circuit design accommodates lower current gain and maximum collector current does not exceed 300 mA.

Q: Can I use a 500 mA rated part in place of the 1.2 A MMBTA64?

A: A 500 mA rated substitute is suitable only if circuit analysis confirms that maximum collector current will not exceed 500 mA under any operating condition, including transient events and worst-case scenarios. If circuit design requires the full 1.2 A capability, use BCV26 as the direct substitute.

Q: What is the significance of the different packaging designations (SOT-23-3, TO-236-3, SC-59)?

A: These designations refer to the same physical package. SOT-23-3, TO-236-3, and SC-59 are equivalent package specifications for surface mount three-terminal components. All recommended substitutes use this identical package, ensuring mechanical and electrical compatibility without PCB redesign.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all active substitute parts listed carry RoHS3 compliance status. The original MMBTA64 does not specify RoHS status as it is classified as obsolete. All recommended substitutes meet current RoHS3 environmental compliance requirements.

Q: What is the operating temperature range difference between substitutes?

A: Most substitutes maintain the full -55°C to 150°C operating temperature range of the MMBTA64. BCV26,215 and PMBTA64,215 specify maximum operating temperature of 150°C without the lower limit explicitly stated in the provided data, but maintain compatibility with the MMBTA64 temperature envelope for practical applications.

Q: Which substitute offers the best frequency performance?

A: BCV26 and BCV26,215 offer the highest transition frequency at 220 MHz, compared to 125 MHz for the MMBTA64. This enhanced frequency response provides improved switching speed and may enable higher-frequency circuit operation. The 2SB852KT146B also offers 200 MHz transition frequency.

Q: Is SMMBTA64LT1G different from MMBTA64LT1G?

A: SMMBTA64LT1G is manufactured by onsemi under a different base product number (SMMBTA64) but maintains identical electrical specifications to MMBTA64LT1G. Both are 500 mA rated active products with equivalent performance characteristics. Selection between them should be based on inventory availability and supply chain preferences.

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