MMBT4355 Equivalent & Substitute Parts Reference

Part Overview

The MMBT4355 is a Surface Mount PNP Bipolar Junction Transistor manufactured by onsemi, housed in a SOT-23-3 package. This device is rated for 60 V collector-emitter breakdown voltage with a maximum collector current of 800 mA and 350 mW power dissipation. The MMBT4355 is classified as an obsolete product. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary to maintain design continuity and ensure long-term component availability for new designs and production requirements.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	60	V
Current - Collector (Ic) (Max)	800	mA
Power - Max	350	mW
Vce Saturation (Max) @ Ib, Ic	1 V @ 100 mA, 1 A	—
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 10 mA, 10 V	—
Operating Temperature Range	-55 to 150	°C
Package / Case	SOT-23-3 (TO-236-3, SC-59)	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the MMBT4355 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: PNP (mandatory match)
Package / Case: SOT-23-3 / TO-236-3 (mandatory match for mechanical compatibility)
Voltage - Collector Emitter Breakdown (Max): Must equal or exceed 60 V
Current - Collector (Ic) (Max): Must equal or exceed 800 mA
Power - Max: Must equal or exceed 350 mW
Operating Temperature Range: Must encompass -55°C to 150°C

Substitute Parts Identified:

Group 1: Full Electrical Equivalents (60 V, ≥800 mA)

DSS5160T-7 (Diodes Incorporated): 60 V, 1 A, 725 mW
FMMT591-TP (Micro Commercial Co): 60 V, 1 A, 500 mW

Group 2: Reduced Current Capability (60 V, <800 mA)

MMBT2907ALT1G (onsemi): 60 V, 600 mA, 300 mW
MMBT2907ALT3G (onsemi): 60 V, 600 mA, 300 mW
CMPT2907A BK PBFREE (Central Semiconductor Corp): 60 V, 600 mA, 350 mW

Group 3: Reduced Voltage Rating (45 V, ≥800 mA)

BCW68FVL (Nexperia USA Inc.): 45 V, 800 mA, 250 mW

Group 4: Reduced Voltage and Current (40-45 V, <800 mA)

MMBT4403LT1G (onsemi): 40 V, 600 mA, 300 mW
MMBT4403LT3G (onsemi): 40 V, 600 mA, 300 mW
BC807-40-7-F (Diodes Incorporated): 45 V, 500 mA, 310 mW

Group 5: Voltage Exceeds Specification (65 V, <800 mA)

BC856B-7-F (Diodes Incorporated): 65 V, 100 mA, 300 mW

Parameter Comparison

Part Number	Manufacturer	Product Status	Vce(BR) Max (V)	Ic Max (mA)	Power Max (mW)	Vce Sat @ Ib, Ic	hFE Min @ Ic, Vce	Freq Trans (MHz)	Temp Range (°C)	Package
MMBT4355	onsemi	Obsolete	60	800	350	1 V @ 100 mA, 1 A	100 @ 10 mA, 10 V	—	-55 to 150	SOT-23-3
DSS5160T-7	Diodes Inc.	Active	60	1000	725	340 mV @ 100 mA, 1 A	150 @ 500 mA, 5 V	150	-55 to 150	SOT-23-3
FMMT591-TP	Micro Commercial Co	Active	60	1000	500	600 mV @ 100 mA, 1 A	100 @ 500 mA, 5 V	150	-55 to 150	SOT-23-3
MMBT2907ALT1G	onsemi	Active	60	600	300	1.6 V @ 50 mA, 500 mA	100 @ 150 mA, 10 V	200	-55 to 150	SOT-23-3
MMBT2907ALT3G	onsemi	Active	60	600	300	1.6 V @ 50 mA, 500 mA	100 @ 150 mA, 10 V	200	-55 to 150	SOT-23-3
CMPT2907A BK PBFREE	Central Semiconductor	Active	60	600	350	1.6 V @ 50 mA, 500 mA	100 @ 150 mA, 10 V	200	-65 to 150	SOT-23-3
BCW68FVL	Nexperia USA Inc.	Active	45	800	250	450 mV @ 50 mA, 500 mA	100 @ 100 mA, 1 V	80	-55 to 150	SOT-23-3
MMBT4403LT1G	onsemi	Active	40	600	300	750 mV @ 50 mA, 500 mA	100 @ 150 mA, 2 V	200	-55 to 150	SOT-23-3
MMBT4403LT3G	onsemi	Active	40	600	300	750 mV @ 50 mA, 500 mA	100 @ 150 mA, 2 V	200	-55 to 150	SOT-23-3
BC807-40-7-F	Diodes Inc.	Active	45	500	310	700 mV @ 50 mA, 500 mA	250 @ 100 mA, 1 V	100	-55 to 150	SOT-23-3
BC856B-7-F	Diodes Inc.	Active	65	100	300	650 mV @ 5 mA, 100 mA	220 @ 2 mA, 5 V	200	-65 to 150	SOT-23-3

Engineering Selection Recommendations

For Direct Replacement (Full Electrical Compatibility):

DSS5160T-7 and FMMT591-TP are the only substitute parts that meet or exceed all electrical specifications of the MMBT4355 (60 V, 800 mA, 350 mW). Both are active products with RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). DSS5160T-7 offers superior power dissipation (725 mW) and transition frequency (150 MHz). FMMT591-TP provides adequate performance with 500 mW power rating. Both maintain the required operating temperature range of -55°C to 150°C.

For Current-Limited Applications (≤600 mA):

MMBT2907ALT1G, MMBT2907ALT3G, and CMPT2907A BK PBFREE are suitable when circuit design permits reduced collector current. All three maintain 60 V voltage rating and -55°C to 150°C operating range. CMPT2907A BK PBFREE offers extended lower temperature operation (-65°C) and matches the original 350 mW power specification. MMBT2907 variants provide enhanced transition frequency (200 MHz) and are onsemi products with established supply chains.

For Voltage-Reduced Applications (40-45 V):

MMBT4403LT1G, MMBT4403LT3G, and BC807-40-7-F are applicable only when circuit design permits reduced collector-emitter breakdown voltage. These parts are suitable for low-voltage applications where 40-45 V rating is acceptable. BC807-40-7-F provides higher DC current gain (250 @ 100 mA, 1 V) compared to the original specification.

For Automotive-Grade Requirements:

BCW68FVL is the only AEC-Q101 qualified substitute, suitable for automotive applications. It maintains 800 mA current capability and 45 V voltage rating with active product status. Power dissipation is reduced to 250 mW, requiring circuit design verification.

Compliance and Availability:

All recommended substitute parts carry RoHS3 compliance and REACH Unaffected status, matching the original part's regulatory profile. All are classified as active products with established inventory levels, ensuring long-term availability compared to the obsolete MMBT4355.

Frequently Asked Questions (FAQ)

Q: Can MMBT2907ALT1G or MMBT2907ALT3G directly replace MMBT4355 in all applications?

A: No. While both maintain 60 V voltage rating and SOT-23-3 package compatibility, maximum collector current is reduced from 800 mA to 600 mA. These parts are suitable only for circuits designed to operate at or below 600 mA collector current. Power dissipation is also reduced from 350 mW to 300 mW.

Q: What is the difference between DSS5160T-7 and FMMT591-TP?

A: Both parts meet the full electrical specification of MMBT4355 (60 V, 1 A, SOT-23-3). DSS5160T-7 provides superior power dissipation (725 mW vs. 500 mW) and higher transition frequency (150 MHz). FMMT591-TP offers adequate performance for most applications with lower power rating. Selection depends on thermal and frequency requirements of the specific circuit.

Q: Can MMBT4403LT1G or MMBT4403LT3G be used as substitutes?

A: Only if circuit design permits 40 V maximum collector-emitter breakdown voltage. The MMBT4355 is rated for 60 V, so these 40 V parts introduce voltage margin reduction. Current capability is also reduced to 600 mA. Use only when voltage and current specifications are confirmed compatible with circuit requirements.

Q: Is BCW68FVL suitable for non-automotive applications?

A: Yes. BCW68FVL is AEC-Q101 qualified for automotive use but can be applied to general industrial and consumer applications. It maintains 800 mA current capability and 45 V voltage rating. Power dissipation is reduced to 250 mW, requiring thermal verification. The automotive qualification provides additional reliability assurance.

Q: Why is BC856B-7-F listed as a substitute if it only supports 100 mA?

A: BC856B-7-F is included for reference in low-current applications where 100 mA maximum collector current is acceptable. It exceeds the voltage specification (65 V) and maintains SOT-23-3 package compatibility. This part is not suitable for applications requiring 800 mA operation.

Q: What is the significance of the different packaging codes (CT, TR, Bulk)?

A: Packaging codes indicate supply format: Cut Tape (CT) & Digi-Reel® for tape-and-reel quantities suitable for automated assembly, Tape & Reel (TR) for standard reel quantities, and Bulk for loose component quantities. All formats contain identical electrical components; selection depends on production volume and assembly equipment compatibility. SOT-23-3 package dimensions remain constant across all supply formats.

Q: Are MMBT2907ALT1G and MMBT2907ALT3G electrically identical?

A: Yes. Both parts carry identical electrical specifications (60 V, 600 mA, 300 mW, 200 MHz transition frequency). The suffix designations (LT1G vs. LT3G) indicate different manufacturing date codes or tape reel configurations. Electrical performance and compatibility are equivalent.

Q: Can CMPT2907A BK PBFREE be used in place of MMBT2907ALT variants?

A: Yes, with extended temperature capability. CMPT2907A BK PBFREE maintains 60 V voltage and 600 mA current specifications but extends lower operating temperature to -65°C (versus -55°C for MMBT2907 variants). Power dissipation matches the original MMBT4355 at 350 mW. This part is suitable for all applications compatible with MMBT2907 variants and offers superior low-temperature performance.

Q: What is the impact of reduced Vce saturation voltage in substitute parts?

A: Lower Vce saturation voltage (such as 340 mV in DSS5160T-7 versus 1 V in MMBT4355) indicates improved switching efficiency and reduced power dissipation during saturation. This is beneficial for circuit performance and thermal management. Higher saturation voltage (such as 1.6 V in MMBT2907 variants) requires circuit design verification to ensure adequate base drive and switching performance.

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