MMDT3946-7 Equivalent & Substitute Parts

Part Overview

The MMDT3946-7 is a Bipolar (BJT) Transistor Array containing 1 NPN and 1 PNP transistor rated for 40V collector-emitter breakdown voltage and 200mA maximum collector current. The device is housed in a 6-pin SOT-363 surface mount package and operates across a temperature range of -55°C to 150°C. This part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value
Transistor Type	1 NPN, 1 PNP
Current - Collector (Ic) (Max)	200mA
Voltage - Collector Emitter Breakdown (Max)	40V
Vce Saturation (Max) @ Ib, Ic	300mV @ 5mA, 50mA / 400mV @ 5mA, 50mA
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 10mA, 1V
Power - Max	200mW
Frequency - Transition	300MHz, 250MHz
Operating Temperature	-55°C ~ 150°C (TJ)
Package / Case	6-TSSOP, SC-88, SOT-363
Mounting Type	Surface Mount
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MMDT3946-7 is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Transistor configuration: 1 NPN, 1 PNP array
Maximum collector current: 200mA
Collector-emitter breakdown voltage: 40V
Vce saturation characteristics: 300mV @ 5mA, 50mA / 400mV @ 5mA, 50mA
DC current gain (hFE): minimum 100 @ 10mA, 1V
Transition frequency: 300MHz and 250MHz
Package compatibility: SOT-363 / SC-88 / 6-TSSOP surface mount
Operating temperature range: -55°C to 150°C

Substitution Categories:

Category 1: Direct Electrical and Mechanical Equivalents Parts meeting all primary criteria with identical or superior electrical specifications and active product status.

Category 2: Functional Equivalents with Parameter Variations Parts with different manufacturers or packaging options that maintain core electrical performance within acceptable tolerances but may have minor specification differences in power dissipation or transition frequency.

Category 3: Conditional Substitutes Parts with reduced maximum collector current (100mA vs. 200mA) or higher breakdown voltage (45V vs. 40V) that function in applications not requiring full rated specifications.

Parameter Comparison

Part Number	Manufacturer	Transistor Type	Ic (Max)	Vce Breakdown (Max)	Vce Sat @ 5mA, 50mA	hFE (Min) @ 10mA, 1V	Power (Max)	Frequency	Temp Range	Package	Product Status	RoHS
MMDT3946-7	Diodes Incorporated	1 NPN, 1 PNP	200mA	40V	300mV / 400mV	100	200mW	300MHz, 250MHz	-55°C ~ 150°C	SOT-363	Discontinued	Non-compliant
MMDT3946-7-F	Diodes Incorporated	1 NPN, 1 PNP	200mA	40V	300mV / 400mV	100	200mW	300MHz, 250MHz	-55°C ~ 150°C	SOT-363	Active	ROHS3 Compliant
MBT3946DW1T1G	onsemi	NPN, PNP	200mA	40V	300mV / 400mV	100	150mW	300MHz, 250MHz	-55°C ~ 150°C	SOT-363	Active	ROHS3 Compliant
MBT3946DW1T2G	onsemi	NPN, PNP	200mA	40V	300mV / 400mV	100	150mW	300MHz, 250MHz	-55°C ~ 150°C	SOT-363	Active	ROHS3 Compliant
CMKT3946 TR PBFREE	Central Semiconductor Corp	1 NPN, 1 PNP	200mA	40V	300mV / 400mV	100	350mW	300MHz, 250MHz	-65°C ~ 150°C	SOT-363	Active	ROHS3 Compliant
PMBT3946YPN,115	Nexperia USA Inc.	NPN, PNP	200mA	40V	300mV / 400mV	100	350mW	300MHz, 250MHz	-55°C ~ 150°C	6-TSSOP	Active	ROHS3 Compliant
PMBT3946YPN,125	Nexperia USA Inc.	NPN, PNP	200mA	40V	300mV / 400mV	100	350mW	300MHz, 250MHz	-55°C ~ 150°C	6-TSSOP	Active	ROHS3 Compliant
BC847BPDW1T1G	onsemi	NPN, PNP	100mA	45V	600mV	200	380mW	100MHz	-55°C ~ 150°C	SOT-363	Active	ROHS3 Compliant
SBC847BPDW1T3G	onsemi	NPN, PNP	100mA	45V	600mV / 650mV	200	380mW	100MHz	-55°C ~ 150°C	SOT-363	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: MMDT3946-7-F

The MMDT3946-7-F is the direct successor to the MMDT3946-7. Manufactured by Diodes Incorporated, this part maintains identical electrical specifications and package configuration while offering active product status and ROHS3 compliance. The only difference is the packaging option (Cut Tape & Digi-Reel vs. the original specification). This part provides the highest level of drop-in compatibility.

Secondary Recommendations: MBT3946DW1T1G and MBT3946DW1T2G

Both onsemi MBT3946 variants meet all core electrical requirements with 200mA collector current, 40V breakdown voltage, and matching saturation characteristics. The primary difference is reduced maximum power dissipation (150mW vs. 200mW), which is acceptable for applications not operating at maximum thermal limits. Both parts are active and ROHS3 compliant. MBT3946DW1T1G is supplied in Cut Tape format, while MBT3946DW1T2G is supplied in Tape & Reel format.

Alternative Recommendation: CMKT3946 TR PBFREE

The Central Semiconductor CMKT3946 provides identical electrical specifications with enhanced power dissipation capability (350mW) and extended lower operating temperature limit (-65°C vs. -55°C). This part is suitable for applications requiring additional thermal margin or operation at lower temperatures.

Automotive-Grade Options: PMBT3946YPN,115 and PMBT3946YPN,125

The Nexperia PMBT3946 series offers AEC-Q100 automotive qualification with identical electrical specifications and enhanced power dissipation (350mW). These parts are suitable for automotive and mission-critical applications requiring automotive-grade component certification. Both variants maintain identical electrical performance; the suffix difference reflects internal manufacturing or date code variations.

Conditional Substitute: BC847BPDW1T1G and SBC847BPDW1T3G

The BC847 series from onsemi provides functional substitution with important parameter differences: maximum collector current is reduced to 100mA (vs. 200mA), breakdown voltage is increased to 45V (vs. 40V), and transition frequency is reduced to 100MHz (vs. 300MHz/250MHz). These parts are suitable only for applications where the reduced current rating and lower frequency performance are acceptable. The SBC847BPDW1T3G variant includes AEC-Q101 automotive qualification.

Frequently Asked Questions (FAQ)

Q: Can MMDT3946-7-F be used as a direct replacement for MMDT3946-7?

A: Yes. The MMDT3946-7-F is electrically and mechanically identical to the MMDT3946-7, with the same SOT-363 package, electrical specifications, and operating temperature range. The primary difference is product status (active vs. discontinued) and RoHS compliance (ROHS3 vs. non-compliant). No circuit modifications are required.

Q: What is the difference between MBT3946DW1T1G and MBT3946DW1T2G?

A: Both parts are electrically identical. The difference is packaging format: MBT3946DW1T1G is supplied in Cut Tape (CT) & Digi-Reel format, while MBT3946DW1T2G is supplied in Tape & Reel (TR) format. Selection depends on assembly line requirements and tape reel compatibility.

Q: Can I use BC847BPDW1T1G to replace MMDT3946-7?

A: BC847BPDW1T1G is a conditional substitute only. While it shares the same SOT-363 package and operating temperature range, it has reduced maximum collector current (100mA vs. 200mA), higher breakdown voltage (45V vs. 40V), and lower transition frequency (100MHz vs. 300MHz/250MHz). Use only in applications where these reduced specifications are acceptable.

Q: What does ROHS3 compliance mean for substitution?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements. The original MMDT3946-7 is non-compliant, while all recommended substitutes are ROHS3 compliant. This is relevant for applications subject to environmental regulations or customer requirements mandating RoHS compliance.

Q: Are PMBT3946YPN,115 and PMBT3946YPN,125 interchangeable?

A: Yes. Both parts have identical electrical specifications and AEC-Q100 automotive qualification. The suffix difference reflects manufacturing or date code variations. Selection between them depends on availability and supply chain requirements.

Q: What is the significance of the power dissipation difference between MMDT3946-7 (200mW) and MBT3946DW1T1G (150mW)?

A: The power dissipation rating indicates maximum thermal capability. The MBT3946DW1T1G has a lower rating but maintains identical electrical performance at standard operating conditions. Use MBT3946DW1T1G in applications where thermal management is adequate. For applications operating near maximum power limits, select CMKT3946 or PMBT3946 variants with 350mW ratings.

Q: Can I mix different substitute parts in the same production batch?

A: All recommended primary substitutes (MMDT3946-7-F, MBT3946DW1T1G, MBT3946DW1T2G, CMKT3946, PMBT3946 series) are electrically equivalent and pin-compatible. However, mixing different manufacturers or part numbers in the same batch may complicate traceability and quality documentation. Standardize on a single part number per production run when possible.

Q: What is the difference between SC-88 and SOT-363 package designations?

A: SC-88 and SOT-363 are equivalent package designations for the same 6-pin surface mount package. Both refer to the same physical form factor and pin configuration. Parts listed with either designation are mechanically compatible.

Q: Should I select an automotive-grade part (PMBT3946YPN or SBC847BPDW1T3G) for non-automotive applications?

A: Automotive-grade parts include additional qualification testing and stricter process controls. For non-automotive applications, standard industrial-grade parts (MMDT3946-7-F, MBT3946DW1T1G) are sufficient and typically more cost-effective. Select automotive-grade only when required by application specifications or customer mandates.

Q: What is the operating temperature difference between CMKT3946 (-65°C to 150°C) and other substitutes (-55°C to 150°C)?

A: The CMKT3946 extends the lower operating temperature limit by 10°C. This is relevant only for applications requiring operation below -55°C. For standard industrial temperature ranges (-55°C to 150°C), all other substitutes are equivalent.

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