FMMTA64TA PNP Darlington Transistor Equivalent & Substitute Parts

Part Overview

The FMMTA64TA is a PNP Darlington bipolar junction transistor manufactured by Diodes Incorporated, designed for surface mount applications in the SOT-23-3 package. This device operates at a maximum collector current of 500 mA with a 30 V collector-emitter breakdown voltage and delivers 330 mW maximum power dissipation. The FMMTA64TA is classified as obsolete, making identification of functionally equivalent active alternatives necessary for new designs and ongoing production support.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP - Darlington	—
Maximum Collector Current (Ic)	500	mA
Collector-Emitter Breakdown Voltage (Max)	30	V
Vce Saturation (Max) @ Ib, Ic	1.5V @ 100µA, 100mA	—
DC Current Gain (hFE Min) @ Ic, Vce	20000 @ 100mA, 5V	—
Maximum Power Dissipation	330	mW
Transition Frequency	125	MHz
Operating Temperature Range	-55 to 150	°C
Package Type	SOT-23-3 (TO-236-3, SC-59)	—
Mounting Type	Surface Mount	—
RoHS Status	Non-compliant	—

Substitute Part Grouping Explanation

Substitution of the FMMTA64TA is determined by strict electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Transistor type must be PNP - Darlington configuration
Collector-emitter breakdown voltage must equal or exceed 30 V
Maximum collector current must equal or exceed 500 mA
DC current gain (hFE) must equal or exceed 20000 @ 100mA, 5V
Vce saturation characteristics must match or improve upon 1.5V @ 100µA, 100mA
Operating temperature range must encompass -55°C to 150°C

Mechanical Compatibility Criteria:

Package must be SOT-23-3 (TO-236-3, SC-59) surface mount configuration
Pinout must be identical for direct board-level substitution

Substitute Categories:

Direct Electrical Equivalents (Pin-Compatible, Identical Ratings):

MMBTA64LT1G (onsemi)
MMBTA64LT3G (onsemi)
SMMBTA64LT1G (onsemi)
PMBTA64,215 (Nexperia USA Inc.)
BCV26,215 (Nexperia USA Inc.)
BCV26,235 (NXP USA Inc.)
BCV26E6327HTSA1 (Infineon Technologies)
MMBTA63-TP (Micro Commercial Co)

Enhanced Performance Substitute (Higher Voltage/Current Rating):

FMMT734TA (Diodes Incorporated) — 100 V / 800 mA rating with improved specifications

Reduced Performance Substitute (Lower Current Rating):

2SB852KT146B (Rohm Semiconductor) — 32 V / 300 mA rating with different gain characteristics

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	Vce Sat @ Ib, Ic	hFE (Min) @ Ic, Vce	Power (Max) mW	Freq MHz	Temp Range °C	Package	Status	RoHS
FMMTA64TA	Diodes Inc.	500	30	1.5V @ 100µA, 100mA	20000 @ 100mA, 5V	330	125	-55 to 150	SOT-23-3	Obsolete	Non-compliant
MMBTA64LT1G	onsemi	500	30	1.5V @ 100µA, 100mA	20000 @ 100mA, 5V	225	125	-55 to 150	SOT-23-3	Active	ROHS3 Compliant
MMBTA64LT3G	onsemi	500	30	1.5V @ 100µA, 100mA	20000 @ 100mA, 5V	225	125	-55 to 150	SOT-23-3	Active	ROHS3 Compliant
SMMBTA64LT1G	onsemi	500	30	1.5V @ 100µA, 100mA	20000 @ 100mA, 5V	225	125	-55 to 150	SOT-23-3	Active	ROHS3 Compliant
PMBTA64,215	Nexperia USA Inc.	500	30	1.5V @ 100µA, 100mA	20000 @ 100mA, 5V	250	125	-55 to 150	SOT-23-3	Active	ROHS3 Compliant
BCV26,215	Nexperia USA Inc.	500	30	1V @ 100µA, 100mA	20000 @ 100mA, 5V	250	220	-55 to 150	SOT-23-3	Active	ROHS3 Compliant
BCV26,235	NXP USA Inc.	500	30	1V @ 100µA, 100mA	20000 @ 100mA, 5V	250	220	-55 to 150	SOT-23-3	Active	ROHS3 Compliant
BCV26E6327HTSA1	Infineon Technologies	500	30	1V @ 100µA, 100mA	20000 @ 100mA, 5V	360	200	-55 to 150	SOT-23-3	Obsolete	ROHS3 Compliant
MMBTA63-TP	Micro Commercial Co	500	30	1.5V @ 100µA, 100mA	10000 @ 100mA, 5V	300	125	-55 to 150	SOT-23-3	Active	ROHS3 Compliant
FMMT734TA	Diodes Inc.	800	100	1.05V @ 5mA, 1A	20000 @ 100mA, 5V	625	140	-55 to 150	SOT-23-3	Active	ROHS3 Compliant
2SB852KT146B	Rohm Semiconductor	300	32	1.5V @ 400µA, 200mA	5000 @ 100mA, 5V	200	200	-55 to 150	SOT-23-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes for Direct Replacement:

The MMBTA64LT1G, MMBTA64LT3G, and SMMBTA64LT1G (all onsemi) provide electrical equivalence with identical current, voltage, and gain specifications. These devices are active products with ROHS3 compliance, addressing the obsolescence of the FMMTA64TA. The onsemi variants differ only in packaging designation (LT1G, LT3G, SMMBTA prefix) and represent the most straightforward substitution path for existing designs.

The PMBTA64,215 (Nexperia USA Inc.) and BCV26,215 (Nexperia USA Inc.) offer equivalent electrical performance with AEC-Q101 automotive qualification. These parts are suitable for applications requiring automotive-grade reliability and traceability.

Enhanced Performance Alternative:

The FMMT734TA (Diodes Incorporated) provides higher voltage (100 V) and current (800 mA) ratings while maintaining the same DC current gain and operating temperature range. This device is appropriate for applications requiring design margin or future performance headroom, though it is not a direct pin-for-pin replacement in terms of absolute maximum ratings.

Reduced Performance Consideration:

The 2SB852KT146B (Rohm Semiconductor) operates at reduced maximum collector current (300 mA) and exhibits lower DC current gain (5000 @ 100mA, 5V). This device is suitable only for applications where the lower current rating is acceptable and where the reduced gain does not compromise circuit function.

Compliance Status:

All recommended active substitutes carry ROHS3 compliance, addressing regulatory requirements that the obsolete FMMTA64TA does not meet. Selection should prioritize active products with current manufacturing status to ensure long-term supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can the MMBTA64LT1G directly replace the FMMTA64TA on existing circuit boards?

A: Yes. The MMBTA64LT1G is electrically and mechanically equivalent to the FMMTA64TA. Both devices share identical collector current (500 mA), collector-emitter breakdown voltage (30 V), DC current gain (20000 @ 100mA, 5V), and SOT-23-3 package configuration. The primary difference is product status (active versus obsolete) and RoHS compliance.

Q: What is the difference between MMBTA64LT1G and MMBTA64LT3G?

A: Both devices are electrically identical with matching electrical specifications. The designations LT1G and LT3G represent different manufacturing batches or tape reel configurations from onsemi. Selection between these variants depends on packaging and supply availability rather than electrical performance.

Q: Why would I select the FMMT734TA over the MMBTA64LT1G?

A: The FMMT734TA is selected when the application requires higher voltage (100 V versus 30 V) or higher current (800 mA versus 500 mA) capability. This device provides design margin for circuits operating near the maximum ratings of the FMMTA64TA. However, the FMMT734TA is not a direct replacement; circuit validation is required to confirm compatibility with the higher voltage rating.

Q: Is the 2SB852KT146B a suitable substitute?

A: The 2SB852KT146B is electrically compatible only for applications where the maximum collector current requirement does not exceed 300 mA and where the reduced DC current gain (5000 versus 20000) does not degrade circuit performance. This device is not recommended as a general-purpose replacement for the FMMTA64TA.

Q: What does RoHS3 compliance mean for my design?

A: ROHS3 compliance indicates that the device meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All active substitute parts listed carry ROHS3 compliance, whereas the obsolete FMMTA64TA does not. New designs should specify ROHS3-compliant devices to meet regulatory and customer requirements.

Q: Are BCV26,215 and PMBTA64,215 interchangeable?

A: Yes. Both devices are electrically equivalent with identical collector current (500 mA), collector-emitter breakdown voltage (30 V), and DC current gain (20000 @ 100mA, 5V). Both carry AEC-Q101 automotive qualification. Selection depends on supply availability and manufacturer preference.

Q: Can I use BCV26E6327HTSA1 as a long-term production substitute?

A: The BCV26E6327HTSA1 is electrically compatible but classified as obsolete. While it is currently in stock, its obsolete status presents supply chain risk for long-term production. Active alternatives such as MMBTA64LT1G or BCV26,215 are recommended for new designs and ongoing production.

Q: What is the significance of the Vce saturation difference between FMMTA64TA and BCV26,215?

A: The FMMTA64TA exhibits Vce saturation of 1.5V @ 100µA, 100mA, while BCV26,215 exhibits 1V @ 100µA, 100mA. The lower saturation voltage of BCV26,215 indicates improved switching performance and reduced power dissipation in saturated operation. This represents an improvement over the original device.

Q: Does package designation affect electrical performance?

A: No. All substitute parts use the SOT-23-3 package (also designated TO-236-3 or SC-59). Package designation variations reflect different supplier nomenclature but do not affect electrical characteristics or board-level compatibility. Pinout and mechanical dimensions remain identical across all listed substitutes.

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