MMDT4403-7 Equivalent & Substitute Parts

Part Overview

The MMDT4403-7 is a dual PNP bipolar junction transistor array manufactured by Diodes Incorporated in a surface mount SOT-363 package. This component is designed for general-purpose switching and amplification applications requiring dual PNP transistor functionality in a compact form factor. The part is currently discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value	Unit
Transistor Type	2 PNP (Dual)	—
Current - Collector (Ic) (Max)	600	mA
Voltage - Collector Emitter Breakdown (Max)	40	V
Vce Saturation (Max) @ Ib, Ic	750mV @ 50mA, 500mA	—
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 150mA, 2V	—
Power - Max	200	mW
Frequency - Transition	200	MHz
Operating Temperature	-55 to 150	°C (TJ)
Mounting Type	Surface Mount	—
Package / Case	6-TSSOP, SC-88, SOT-363	—

Substitute Part Grouping Explanation

Substitution of the MMDT4403-7 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Transistor configuration: Dual PNP (2 PNP)
Maximum collector current (Ic): Must equal or exceed 600mA
Collector-emitter breakdown voltage (VCEO): Must equal or exceed 40V
DC current gain (hFE): Minimum 100 at specified test conditions
Transition frequency: Must support 200MHz operation
Power dissipation: Must support 200mW maximum

Mechanical Compatibility Requirements:

Package type: SOT-363 (6-TSSOP, SC-88)
Mounting: Surface mount
Pin configuration: Identical to SOT-363 standard

Compliance Requirements:

RoHS compliance status
Moisture sensitivity level (MSL): 1 (Unlimited)
REACH status: REACH Unaffected

Substitute parts are grouped into two categories: Direct Equivalents (identical electrical and mechanical specifications) and Functional Substitutes (meet or exceed electrical requirements with compatible packaging).

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	VCEO (Max) V	Vce Sat (Max) mV	hFE (Min)	fT (MHz)	P (Max) mW	Package	Product Status	RoHS
MMDT4403-7	Diodes Incorporated	600	40	750	100	200	200	SOT-363	Discontinued	Non-compliant
MMDT4403-7-F	Diodes Incorporated	600	40	750	100	200	200	SOT-363	Active	ROHS3 Compliant
MMDT4403-TP	Micro Commercial Co	600	40	750	100	200	200	SOT-363	Active	ROHS3 Compliant
MBT3906DW1T1G	onsemi	200	40	400	100	250	150	SOT-363	Active	ROHS3 Compliant
BC857BDW1T1G	onsemi	100	45	650	220	100	380	SOT-363	Active	ROHS3 Compliant
BC857SH6327XTSA1	Infineon Technologies	100	45	650	200	250	250	SOT-363	Last Time Buy	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (Recommended Primary Substitutes):

MMDT4403-7-F (Diodes Incorporated) and MMDT4403-TP (Micro Commercial Co) are direct electrical and mechanical equivalents to the MMDT4403-7. Both parts maintain identical specifications for collector current (600mA), breakdown voltage (40V), saturation voltage, current gain, and transition frequency. Both are in active production status with ROHS3 compliance, making them suitable for new designs and production continuity. MMDT4403-7-F is supplied in Tape & Reel packaging, while MMDT4403-TP is also supplied in Tape & Reel format with higher inventory availability (29,200 units).

Functional Substitutes (Application-Dependent):

MBT3906DW1T1G (onsemi) is a functional substitute suitable for applications where collector current requirements do not exceed 200mA. This part maintains the 40V breakdown voltage specification and offers improved transition frequency (250MHz) and lower saturation voltage (400mV). Power dissipation is reduced to 150mW, which may be advantageous in thermally constrained designs.

BC857BDW1T1G (onsemi) and BC857SH6327XTSA1 (Infineon Technologies) are functional substitutes for low-current applications (maximum 100mA). These parts offer higher breakdown voltage (45V) and improved current gain characteristics. BC857BDW1T1G provides higher power dissipation capability (380mW), while BC857SH6327XTSA1 offers enhanced transition frequency (250MHz). BC857SH6327XTSA1 is in Last Time Buy status and should not be selected for new production.

All substitute parts maintain SOT-363 package compatibility, surface mount mounting type, and unlimited moisture sensitivity level (MSL 1).

Frequently Asked Questions (FAQ)

Q: Can MMDT4403-7-F be used as a direct replacement for MMDT4403-7?

A: Yes. MMDT4403-7-F is a direct equivalent with identical electrical specifications (600mA Ic, 40V VCEO, 200MHz fT, 200mW power). The primary difference is product status (Active vs. Discontinued) and RoHS compliance (ROHS3 vs. Non-compliant). Both use SOT-363 packaging with identical pin configuration.

Q: What is the difference between MMDT4403-7-F and MMDT4403-TP?

A: Both are direct electrical equivalents with identical specifications. The difference is manufacturer: MMDT4403-7-F is manufactured by Diodes Incorporated, while MMDT4403-TP is manufactured by Micro Commercial Co. MMDT4403-TP has higher inventory availability (29,200 units vs. 20,300 units). Both are ROHS3 compliant and in active production.

Q: Can MBT3906DW1T1G replace MMDT4403-7 in all applications?

A: MBT3906DW1T1G is a functional substitute only for applications where collector current does not exceed 200mA. The MMDT4403-7 supports 600mA maximum collector current, while MBT3906DW1T1G supports only 200mA. Both maintain 40V breakdown voltage and SOT-363 packaging. Applications requiring full 600mA capability must use MMDT4403-7-F or MMDT4403-TP.

Q: Are BC857 series parts compatible with MMDT4403-7?

A: BC857BDW1T1G and BC857SH6327XTSA1 are functionally compatible only for low-current applications (maximum 100mA). Both use SOT-363 packaging and maintain -55°C to 150°C operating temperature range. However, maximum collector current is reduced from 600mA to 100mA, and saturation voltage is higher (650mV vs. 750mV). These parts are suitable only when application current requirements are below 100mA.

Q: What packaging options are available for substitute parts?

A: All substitute parts listed use SOT-363 package (also designated as 6-TSSOP or SC-88). Packaging variants differ only in tape format: MMDT4403-7-F and MMDT4403-TP are supplied in Tape & Reel (TR) format, while BC857BDW1T1G is supplied in Cut Tape (CT) & Digi-Reel format, and BC857SH6327XTSA1 is supplied in Cut Tape (CT) format. All are surface mount compatible with identical PCB footprints.

Q: Is RoHS compliance a factor in selecting substitutes?

A: The original MMDT4403-7 is RoHS non-compliant. All recommended substitute parts (MMDT4403-7-F, MMDT4403-TP, MBT3906DW1T1G, BC857BDW1T1G) are ROHS3 compliant. For applications requiring RoHS compliance, MMDT4403-7-F or MMDT4403-TP are required. BC857SH6327XTSA1 is also ROHS3 compliant but is in Last Time Buy status.

Q: Why is BC857SH6327XTSA1 not recommended for new designs?

A: BC857SH6327XTSA1 is in Last Time Buy status, indicating the manufacturer is discontinuing production. While currently available (68,765 units in stock), this part should not be selected for new production designs. MMDT4403-7-F, MMDT4403-TP, or MBT3906DW1T1G are preferred for long-term supply assurance.

Q: What is the moisture sensitivity level (MSL) for all listed parts?

A: All parts listed maintain MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. Parts can be stored and handled without special moisture control measures, and shelf life is unlimited under standard storage conditions.

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