FMMTA56TC Equivalent & Substitute Parts

Part Overview

The FMMTA56TC is a PNP bipolar junction transistor manufactured by Diodes Incorporated, rated for 80 V collector-emitter breakdown voltage and 500 mA maximum collector current. This device is packaged in SOT-23-3 surface mount configuration and is designed for general-purpose switching and amplification applications. The FMMTA56TC is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for ongoing production and repair applications.

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
DC Current Gain (hFE Min)	50	@ 100mA, 1V
Power Dissipation (Max)	330	mW
Transition Frequency	100	MHz
Operating Temperature Range	-55 to 150	°C
Package Type	SOT-23-3	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the FMMTA56TC is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: PNP (mandatory)
Collector-Emitter Breakdown Voltage: 80 V minimum
Collector Current: 500 mA minimum
Package Type: SOT-23-3 or equivalent surface mount configuration
Mounting Type: Surface Mount

Secondary Compatibility Factors:

Vce Saturation characteristics at specified bias conditions
DC Current Gain (hFE) minimum specifications
Power dissipation rating
Operating temperature range
RoHS3 compliance and MSL rating

Substitute parts are grouped into two categories:

Category A - Direct Electrical Equivalents (80V, 500mA, SOT-23-3): Parts that match the primary electrical specifications and package requirements of the FMMTA56TC, enabling direct replacement in most applications.

Category B - Functional Alternatives (Modified Electrical Specifications): Parts that deviate from one or more primary specifications but remain compatible within defined application constraints. These include devices with different voltage ratings, current ratings, or frequency characteristics that may be suitable depending on circuit requirements.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	Vce Sat mV	hFE (Min)	Power mW	Freq MHz	Temp °C	Package	Status
FMMTA56TC	Diodes Inc.	500	80	250 @ 10mA, 100mA	50 @ 100mA, 1V	330	100	-55 to 150	SOT-23-3	Obsolete
2SB1198KT146Q	Rohm Semi.	500	80	500 @ 50mA, 500mA	120 @ 100mA, 3V	200	180	-55 to 150	SMT3	Active
2SB1198KT146R	Rohm Semi.	500	80	500 @ 50mA, 500mA	180 @ 100mA, 3V	200	180	-55 to 150	SMT3	Active
CMPT8599 TR PBFREE	Central Semi.	500	80	300 @ 10mA, 100mA	100 @ 1mA, 5V	350	150	-65 to 150	SOT-23	Active
CMPTA56 TR PBFREE	Central Semi.	500	80	250 @ 10mA, 100mA	100 @ 100mA, 1V	350	100	-65 to 175	SOT-23	Active
MMBT2907ALT1G	onsemi	600	60	1.6V @ 50mA, 500mA	100 @ 150mA, 10V	300	200	-55 to 150	SOT-23-3	Active
MMBT2907ALT3G	onsemi	600	60	1.6V @ 50mA, 500mA	100 @ 150mA, 10V	300	200	-55 to 150	SOT-23-3	Active
MMBT4403LT1G	onsemi	600	40	750 @ 50mA, 500mA	100 @ 150mA, 2V	300	200	-55 to 150	SOT-23-3	Active
MMBT4403LT3G	onsemi	600	40	750 @ 50mA, 500mA	100 @ 150mA, 2V	300	200	-55 to 150	SOT-23-3	Active
PMBTA56,215	Nexperia	500	80	250 @ 10mA, 100mA	100 @ 100mA, 1V	250	50	-55 to 150	TO-236AB	Active
PMBTA56,235	Nexperia	500	80	250 @ 10mA, 100mA	100 @ 100mA, 1V	250	50	-55 to 150	TO-236AB	Active

Engineering Selection Recommendations

Tier 1 - Recommended Direct Substitutes (80V, 500mA, SOT-23-3 Package):

The following parts provide the closest electrical and mechanical equivalence to the FMMTA56TC:

CMPTA56 TR PBFREE (Central Semiconductor Corp): Matches the primary electrical specifications (80V, 500mA) with identical Vce saturation and hFE characteristics at the specified bias point. Extended operating temperature range (-65°C to 175°C) provides additional thermal margin. Active product status with full RoHS3 compliance and unlimited MSL rating. Recommended for direct replacement in new designs and production applications.
CMPT8599 TR PBFREE (Central Semiconductor Corp): Meets 80V, 500mA requirements with comparable Vce saturation performance. Higher transition frequency (150MHz) and power rating (350mW) provide performance headroom. Active status with full compliance certifications. Suitable for applications requiring enhanced frequency response.
PMBTA56,235 and PMBTA56,215 (Nexperia USA Inc.): Both variants maintain 80V, 500mA electrical specifications with matching Vce saturation and hFE characteristics. AEC-Q101 automotive qualification provides additional reliability assurance. Active product status with full compliance. Recommended for automotive and mission-critical applications.

Tier 2 - Functional Alternatives (Modified Specifications):

2SB1198KT146R and 2SB1198KT146Q (Rohm Semiconductor): Provide 80V, 500mA ratings with enhanced transition frequency (180MHz). Higher DC current gain (120-180 @ 100mA, 3V) and elevated Vce saturation (500mV) require circuit evaluation. Active status with full compliance. Suitable for high-frequency switching applications where enhanced gain is beneficial.

Tier 3 - Limited Compatibility (Reduced Voltage Rating):

MMBT4403LT1G and MMBT4403LT3G (onsemi): Reduced collector-emitter breakdown voltage (40V) limits application scope to circuits operating below 40V. Higher collector current capability (600mA) and enhanced frequency response (200MHz) do not offset voltage limitation. Use only in applications with confirmed voltage headroom.
MMBT2907ALT1G and MMBT2907ALT3G (onsemi): Reduced collector-emitter breakdown voltage (60V) and elevated Vce saturation (1.6V @ 50mA, 500mA) restrict compatibility. Higher collector current (600mA) and frequency (200MHz) provide performance benefits in low-voltage applications only.

Product Status Consideration:

All recommended substitutes maintain active product status, ensuring long-term availability and supply chain stability. The FMMTA56TC obsolete status necessitates transition to active alternatives for ongoing production support.

Frequently Asked Questions (FAQ)

Q1: Can MMBT4403LT1G or MMBT4403LT3G directly replace FMMTA56TC?

No. While these parts share the SOT-23-3 package and 500mA collector current capability, the reduced collector-emitter breakdown voltage (40V versus 80V) creates a critical incompatibility. Direct substitution is only permissible in circuits confirmed to operate below 40V with adequate safety margin. The FMMTA56TC is rated for 80V operation; substitution with a 40V device introduces risk of device failure in applications utilizing the full voltage rating.

Q2: What is the difference between PMBTA56,215 and PMBTA56,235?

Both variants are manufactured by Nexperia and provide identical electrical specifications (80V, 500mA, 250mV Vce saturation, 100 hFE minimum). The primary distinction is the collector cutoff current specification: PMBTA56,215 specifies 50nA (ICBO) while PMBTA56,235 specifies 500nA (ICBO). Both are AEC-Q101 qualified and suitable for automotive applications. Selection between variants depends on leakage current requirements of the specific application.

Q3: Why do 2SB1198KT146R and 2SB1198KT146Q have different hFE specifications?

Both Rohm devices maintain the same electrical ratings (80V, 500mA) but differ in DC current gain specification: 2SB1198KT146Q specifies 120 hFE minimum while 2SB1198KT146R specifies 180 hFE minimum. This represents a binning difference within the same product family. The higher gain variant (2SB1198KT146R) provides enhanced amplification capability and may reduce base drive requirements in amplifier circuits. Selection depends on circuit design requirements for current gain.

Q4: Are CMPTA56 TR PBFREE and CMPT8599 TR PBFREE interchangeable?

Both Central Semiconductor parts meet the 80V, 500mA primary specifications and share SOT-23 packaging. CMPTA56 TR PBFREE matches the FMMTA56TC transition frequency (100MHz) and Vce saturation (250mV), providing closer electrical equivalence. CMPT8599 TR PBFREE offers higher transition frequency (150MHz) and power rating (350mW). Interchangeability is confirmed for most applications; selection depends on frequency response requirements and thermal design margins.

Q5: What is the significance of the "TR PBFREE" designation in Central Semiconductor part numbers?

"TR" indicates Tape & Reel packaging format suitable for automated assembly. "PBFREE" confirms lead-free construction compliant with RoHS3 regulations. These designations do not affect electrical performance or substitution compatibility; they specify packaging and environmental compliance characteristics.

Q6: Can MMBT2907ALT1G replace FMMTA56TC in a 60V application?

No. While MMBT2907ALT1G is rated for 60V collector-emitter breakdown, the FMMTA56TC is rated for 80V. Substitution would reduce voltage headroom by 20V, creating unacceptable risk in applications designed for 80V operation. Additionally, MMBT2907ALT1G exhibits significantly higher Vce saturation (1.6V versus 250mV), which may cause excessive power dissipation and thermal stress. This substitution is not recommended.

Q7: What packaging differences exist between SOT-23-3 and TO-236AB?

SOT-23-3 and TO-236AB are equivalent package designations for the same physical form factor. Both refer to a three-terminal surface mount package with identical pin configuration and PCB footprint. Parts specified as either SOT-23-3 or TO-236AB are mechanically and electrically interchangeable from a packaging perspective. PMBTA56,215 and PMBTA56,235 use the TO-236AB designation while other substitutes use SOT-23-3; this represents nomenclature variation only and does not affect compatibility.

Q8: Why is the FMMTA56TC classified as obsolete?

Product obsolescence reflects manufacturer discontinuation decisions based on market demand, technology evolution, and production economics. The availability of active equivalent parts (CMPTA56 TR PBFREE, PMBTA56 variants) with superior or equivalent specifications supports transition from the obsolete FMMTA56TC. Continued use of obsolete components creates supply chain risk; migration to active alternatives is recommended for new designs and production planning.

Q9: Are all substitute parts RoHS3 compliant?

Yes. All substitute parts listed in this reference maintain ROHS3 compliance certification. The FMMTA56TC also carries ROHS3 compliance, ensuring environmental and regulatory consistency across all recommended alternatives.

Q10: What is the Moisture Sensitivity Level (MSL) significance for these parts?

All listed parts, including the FMMTA56TC and all substitutes, carry MSL rating of 1 (Unlimited). This indicates unlimited shelf life without moisture control requirements, simplifying inventory management and reducing handling constraints. No special moisture-barrier packaging or desiccant storage is required for any of these components.

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