MMDT4401-7 Equivalent & Substitute Parts

Part Overview

The MMDT4401-7 is a dual NPN 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 40V collector-emitter breakdown voltage and 600mA maximum collector current. The MMDT4401-7 is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and procurement. Active alternatives with identical or compatible electrical and mechanical specifications are available from multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Transistor Type	2 NPN (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, 1V	—
Power - Max	200	mW
Frequency - Transition	250	MHz
Operating Temperature	-55 to 150	°C (TJ)
Mounting Type	Surface Mount	—
Package / Case	6-TSSOP, SC-88, SOT-363	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the MMDT4401-7 is determined by the following critical parameters:

Electrical Compatibility Criteria:

Transistor configuration: 2 NPN (Dual) array
Collector-emitter breakdown voltage: minimum 40V
Maximum collector current: minimum 600mA
Operating temperature range: -55°C to 150°C
Package type: SOT-363 (6-TSSOP, SC-88)

Substitution Categories:

Direct Equivalent (Identical Specifications): Parts with matching electrical ratings and identical package designation. MMDT4401-7-F from Diodes Incorporated and MMDT4401-TP from Micro Commercial Co meet all electrical and mechanical requirements without derating.

Functional Equivalent (Lower Current Rating): Parts with reduced maximum collector current (100mA to 200mA) but matching voltage ratings and package type. BC847BDW1T1G, BC847BDW1T3G, and BC847CDW1T1G from onsemi are suitable for applications not requiring the full 600mA current capability. MBT3904DW1T1G and MBT3904DW1T3G from onsemi, and MMDT3904-TP from Micro Commercial Co provide 200mA maximum current.

Functional Equivalent (Higher Current Rating): MBT2222ADW1T1G from onsemi maintains the 600mA current rating with identical voltage specifications and package type.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) (Max) V	Vce Sat (Max) mV	hFE (Min)	Power (Max) mW	Frequency MHz	Package	Product Status	RoHS Status
MMDT4401-7	Diodes Incorporated	600	40	750	100	200	250	SOT-363	Discontinued	Non-compliant
MMDT4401-7-F	Diodes Incorporated	600	40	750	100	200	250	SOT-363	Active	ROHS3 Compliant
MMDT4401-TP	Micro Commercial Co	600	40	750	100	200	250	SOT-363	Active	ROHS3 Compliant
MBT2222ADW1T1G	onsemi	600	40	1000	100	150	300	SOT-363	Active	ROHS3 Compliant
BC847BDW1T1G	onsemi	100	45	600	200	380	100	SOT-363	Active	ROHS3 Compliant
BC847BDW1T3G	onsemi	100	45	600	200	380	100	SOT-363	Active	ROHS3 Compliant
BC847CDW1T1G	onsemi	100	45	600	420	380	100	SOT-363	Active	ROHS3 Compliant
MBT3904DW1T1G	onsemi	200	40	300	100	150	300	SOT-363	Active	ROHS3 Compliant
MBT3904DW1T3G	onsemi	200	40	300	100	150	300	SOT-363	Active	ROHS3 Compliant
MMDT3904-TP	Micro Commercial Co	200	40	300	100	200	300	SOT-363	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents):

MMDT4401-7-F from Diodes Incorporated is the direct active equivalent. This part maintains identical electrical specifications (600mA Ic, 40V Vce(br), 250MHz transition frequency) and package configuration. MMDT4401-7-F is ROHS3 compliant, addressing regulatory requirements absent in the discontinued MMDT4401-7.

MMDT4401-TP from Micro Commercial Co provides equivalent electrical performance with identical current and voltage ratings. This part is actively manufactured and ROHS3 compliant.

Secondary Substitutes (Current-Limited Applications):

MBT2222ADW1T1G from onsemi maintains the 600mA collector current rating and 40V breakdown voltage. This part features higher transition frequency (300MHz) and is suitable for applications requiring the full current specification. Vce saturation is slightly elevated at 1000mV compared to 750mV of the original part.

Tertiary Substitutes (Reduced Current Applications):

MBT3904DW1T1G, MBT3904DW1T3G from onsemi, and MMDT3904-TP from Micro Commercial Co are suitable for applications requiring maximum 200mA collector current. These parts maintain 40V breakdown voltage and SOT-363 package compatibility. All are ROHS3 compliant and actively produced.

BC847BDW1T1G, BC847BDW1T3G, and BC847CDW1T1G from onsemi are suitable for applications requiring maximum 100mA collector current. These parts feature higher breakdown voltage (45V) and are ROHS3 compliant. BC847CDW1T1G provides higher DC current gain (420 minimum) compared to BC847B variants (200 minimum).

Compliance Considerations:

All recommended substitutes are ROHS3 compliant, addressing environmental and regulatory requirements. The original MMDT4401-7 is RoHS non-compliant; migration to compliant alternatives is necessary for new designs and ongoing procurement.

Frequently Asked Questions (FAQ)

Q: Can MMDT4401-7-F be used as a direct replacement for MMDT4401-7?

A: Yes. MMDT4401-7-F is electrically and mechanically identical to MMDT4401-7. Both parts feature 600mA maximum collector current, 40V breakdown voltage, 250MHz transition frequency, and SOT-363 package configuration. MMDT4401-7-F is actively manufactured and ROHS3 compliant.

Q: What is the difference between MMDT4401-TP and MMDT4401-7-F?

A: Both parts are direct equivalents with identical electrical specifications. The primary difference is manufacturer: MMDT4401-7-F is manufactured by Diodes Incorporated, while MMDT4401-TP is manufactured by Micro Commercial Co. Both are ROHS3 compliant and actively produced.

Q: Can BC847BDW1T1G replace MMDT4401-7 in all applications?

A: BC847BDW1T1G is suitable only for applications not requiring the full 600mA collector current. BC847BDW1T1G is rated for maximum 100mA, compared to 600mA for MMDT4401-7. Applications requiring higher current must use MBT2222ADW1T1G, MMDT4401-7-F, or MMDT4401-TP.

Q: What is the difference between MBT3904DW1T1G and MBT3904DW1T3G?

A: Both parts are electrically identical with 200mA maximum collector current, 40V breakdown voltage, and SOT-363 package. The suffix designates different tape reel configurations. Selection depends on packaging and handling requirements.

Q: Are all substitute parts available in SOT-363 package?

A: Yes. All listed substitute parts are available in SOT-363 package (also designated as 6-TSSOP or SC-88). Package compatibility is maintained across all substitutes.

Q: What is the impact of higher transition frequency in MBT2222ADW1T1G?

A: MBT2222ADW1T1G features 300MHz transition frequency compared to 250MHz in MMDT4401-7. Higher transition frequency indicates faster switching capability and is not detrimental to applications designed for the original part. This represents an improvement in high-frequency performance.

Q: Can MMDT3904-TP be used in place of MMDT4401-7?

A: MMDT3904-TP is suitable only for applications not requiring the full 600mA collector current. MMDT3904-TP is rated for maximum 200mA. Applications requiring 600mA must use MBT2222ADW1T1G, MMDT4401-7-F, or MMDT4401-TP.

Q: What does ROHS3 compliance mean for these parts?

A: ROHS3 compliance indicates conformance to Restriction of Hazardous Substances Directive 3, restricting use of specific hazardous materials including lead, cadmium, and mercury. All active substitute parts listed are ROHS3 compliant, addressing environmental and regulatory requirements.

Q: Are there packaging differences between Tape & Reel (TR) and Cut Tape (CT) options?

A: Tape & Reel (TR) packaging is supplied on continuous tape reels for automated assembly. Cut Tape (CT) & Digi-Reel® packaging is supplied in smaller quantities on cut tape segments. Electrical specifications are identical; selection depends on production volume and handling requirements.

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