MMBF170-7 N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The MMBF170-7 is an N-Channel MOSFET manufactured by Diodes Incorporated, rated for 60V drain-to-source voltage with 500mA continuous drain current in a surface mount SOT-23-3 package. This device is designed for general-purpose switching and amplification applications requiring compact form factors and moderate current handling.

The MMBF170-7 is currently discontinued at DiGi Electronics. Equivalent and substitute parts are available from multiple manufacturers with matching or comparable electrical and mechanical specifications, enabling continued design implementation and production support.

Key Parameters

Parameter	MMBF170-7 Specification
FET Type	N-Channel
Technology	MOSFET (Metal Oxide)
Drain-to-Source Voltage (Vdss)	60 V
Continuous Drain Current (Id) @ 25°C	500 mA (Ta)
On-Resistance (Rds On Max) @ Id, Vgs	5 Ω @ 200 mA, 10V
Gate-Source Threshold Voltage (Vgs(th) Max) @ Id	3 V @ 250 µA
Gate-Source Voltage (Vgs Max)	±20 V
Input Capacitance (Ciss Max) @ Vds	40 pF @ 10 V
Power Dissipation (Max)	300 mW (Ta)
Operating Temperature Range	-55°C to 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	TO-236-3, SC-59, SOT-23-3
RoHS Status	RoHS Non-Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the MMBF170-7 are grouped based on electrical and mechanical compatibility within the N-Channel MOSFET category. The primary substitution criteria are:

Critical Parameters for Substitution:

Drain-to-Source Voltage (Vdss): 60 V minimum
FET Type: N-Channel
Package: SOT-23-3 or TO-236-3 compatible footprints
Operating Temperature Range: -55°C to 150°C minimum
Mounting Type: Surface Mount

Secondary Parameters Affecting Suitability:

Continuous Drain Current (Id): 500 mA or higher preferred for direct replacement
On-Resistance (Rds On): 5 Ω or lower at specified conditions
Gate-Source Threshold Voltage (Vgs(th)): 3 V or lower
Power Dissipation: 300 mW or higher

Parts are classified into two categories:

Category A - Direct Equivalents: Parts with identical or superior electrical specifications and active product status, suitable for direct substitution without circuit modification.

Category B - Functional Alternatives: Parts with reduced current ratings or modified electrical characteristics that function within the same voltage class and package family but require application-level verification.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (mA)	Rds On Max (Ω)	Vgs(th) Max (V)	Power Diss. (mW)	Package	Product Status	RoHS Status
MMBF170-7	Diodes Incorporated	60	500	5 @ 200mA, 10V	3 @ 250µA	300	SOT-23-3	Discontinued	RoHS Non-Compliant
MMBF170-7-F	Diodes Incorporated	60	500	5 @ 200mA, 10V	3 @ 250µA	300	SOT-23-3	Active	RoHS3 Compliant
MMBF170	onsemi	60	500	5 @ 200mA, 10V	3 @ 1mA	300	SOT-23-3	Active	RoHS3 Compliant
MMBF170LT1G	onsemi	60	500	5 @ 200mA, 10V	3 @ 1mA	225	SOT-23-3	Active	RoHS3 Compliant
T2N7002AK,LM	Toshiba Semiconductor and Storage	60	200	3.9 @ 100mA, 10V	2.1 @ 250µA	320	SOT-23-3	Active	RoHS3 Compliant
2N7002	UMW	60	115	5 @ 500mA, 10V	2.5 @ 250µA	225	SOT-23	Active	RoHS3 Compliant
BSS138AKAR	Nexperia USA Inc.	60	200	4.5 @ 100mA, 10V	1.5 @ 250mA	300	TO-236AB	Active	RoHS3 Compliant
NX7002AKAR	Nexperia USA Inc.	60	190	4.5 @ 100mA, 10V	2.1 @ 250µA	265	TO-236AB	Obsolete	RoHS3 Compliant
PMBF170,215	Nexperia USA Inc.	60	300	5 @ 500mA, 10V	2 @ 1mA	830 (Tc)	TO-236AB	Not For New Designs	RoHS3 Compliant
PMBF170,235	Nexperia USA Inc.	60	300	5 @ 500mA, 10V	2 @ 1mA	830 (Tc)	TO-236AB	Not For New Designs	RoHS3 Compliant
SN7002NH6433XTMA1	Infineon Technologies	60	200	5 @ 500mA, 10V	1.8 @ 26µA	360	PG-SOT23	Active	RoHS3 Compliant

Engineering Selection Recommendations

Recommended Direct Substitutes (Category A):

MMBF170-7-F (Diodes Incorporated) is the primary recommended substitute. This part maintains identical electrical specifications to the MMBF170-7 while offering active product status and RoHS3 compliance. The -F suffix indicates Digi-Reel packaging format. Inventory availability is substantial at 257,842 units.

MMBF170 (onsemi) provides equivalent electrical performance with active product status and RoHS3 compliance. Specifications match the original part with 500 mA continuous drain current and 5 Ω on-resistance. This part is sourced from a different manufacturer but maintains full compatibility.

MMBF170LT1G (onsemi) offers identical electrical characteristics with the exception of reduced power dissipation (225 mW vs. 300 mW). This part is suitable for applications where thermal management is not a limiting factor. Active product status and RoHS3 compliance are confirmed.

Functional Alternatives (Category B):

T2N7002AK,LM (Toshiba Semiconductor and Storage) operates at 60 V with reduced continuous drain current of 200 mA. Superior on-resistance of 3.9 Ω at 100 mA provides lower conduction losses in lower-current applications. Active product status and RoHS3 compliance are confirmed.

SN7002NH6433XTMA1 (Infineon Technologies) is rated for 200 mA continuous drain current with 5 Ω on-resistance at 500 mA. The SIPMOS™ technology platform provides active product status and RoHS3 compliance. Package designation is PG-SOT23, maintaining SOT-23-3 footprint compatibility.

BSS138AKAR (Nexperia USA Inc.) is rated for 200 mA continuous drain current with automotive-grade qualification (AEC-Q100). This part is suitable for applications requiring automotive-level reliability. RoHS3 compliance is confirmed.

Parts Not Recommended for New Designs:

PMBF170,215 and PMBF170,235 are designated "Not For New Designs" by the manufacturer. While electrically functional, these parts should not be selected for new product development. Existing designs using these parts may continue to source them during the transition period.

NX7002AKAR (Nexperia USA Inc.) is listed as obsolete and should not be selected for new designs or production quantities.

2N7002 (UMW) is rated for only 115 mA continuous drain current, representing a significant reduction from the 500 mA specification of the MMBF170-7. This part is suitable only for applications with substantially lower current requirements.

Frequently Asked Questions (FAQ)

Q: Can MMBF170-7-F be used as a direct replacement for MMBF170-7?

A: Yes. MMBF170-7-F maintains identical electrical specifications including 60 V Vdss, 500 mA continuous drain current, and 5 Ω on-resistance. The primary difference is product status (active vs. discontinued) and RoHS compliance (RoHS3 vs. non-compliant). The -F suffix indicates Digi-Reel packaging format. No circuit modifications are required.

Q: What is the difference between MMBF170 and MMBF170LT1G?

A: Both parts are manufactured by onsemi and share identical electrical specifications for voltage, current, and on-resistance. The primary difference is power dissipation: MMBF170 is rated for 300 mW while MMBF170LT1G is rated for 225 mW. MMBF170LT1G is suitable for applications where thermal management is not a constraint. Both parts are active and RoHS3 compliant.

Q: Are the Nexperia parts (BSS138AKAR, NX7002AKAR, PMBF170 variants) compatible with the MMBF170-7?

A: Nexperia parts operate at the same 60 V voltage rating and use compatible SOT-23-3 or TO-236AB packages. However, they feature reduced continuous drain current ratings (190–300 mA vs. 500 mA). These parts are functional alternatives for applications with lower current requirements. NX7002AKAR is obsolete and PMBF170 variants are not recommended for new designs.

Q: Can T2N7002AK,LM replace MMBF170-7 in all applications?

A: T2N7002AK,LM operates at 60 V with 200 mA continuous drain current, compared to 500 mA for the MMBF170-7. This part is suitable only for applications where the circuit current requirement does not exceed 200 mA. Superior on-resistance (3.9 Ω) provides lower conduction losses in lower-current designs. Circuit-level verification is required.

Q: What is the significance of RoHS compliance in selecting a substitute?

A: RoHS3 compliance indicates the part meets current environmental and hazardous substance restrictions. The original MMBF170-7 is RoHS non-compliant. Most active substitutes (MMBF170-7-F, MMBF170, MMBF170LT1G, T2N7002AK,LM, BSS138AKAR, SN7002NH6433XTMA1) are RoHS3 compliant, making them suitable for new product designs subject to RoHS regulations.

Q: Are there package differences between substitute parts?

A: Most substitutes use SOT-23-3 or TO-236AB packages, which share compatible footprints. SN7002NH6433XTMA1 uses PG-SOT23 designation but maintains SOT-23-3 footprint compatibility. Verify PCB layout and land pattern compatibility before final part selection. All parts listed are surface mount devices.

Q: What is the difference between continuous drain current (Id) ratings?

A: Continuous drain current specifies the maximum DC current the device can conduct indefinitely at the specified temperature without exceeding power dissipation limits. MMBF170-7 is rated for 500 mA. Substitutes with lower ratings (115–300 mA) are suitable only for applications where circuit current does not exceed the specified limit. Exceeding this rating results in thermal runaway and device failure.

Q: Which substitute offers the best on-resistance performance?

A: T2N7002AK,LM offers the lowest on-resistance at 3.9 Ω (measured at 100 mA, 10V gate-source voltage). This provides superior conduction efficiency in lower-current applications. However, this part is limited to 200 mA continuous drain current. For 500 mA applications, MMBF170-7-F and MMBF170 maintain 5 Ω on-resistance.

Q: Is automotive qualification required for my application?

A: BSS138AKAR is qualified to AEC-Q100 automotive standards, making it suitable for automotive applications requiring grade-level reliability. Standard industrial-grade substitutes (MMBF170-7-F, MMBF170, T2N7002AK,LM) do not carry automotive qualification. Verify application requirements before selecting a qualified part.

Q: What inventory considerations should guide part selection?

A: MMBF170-7-F offers the highest inventory availability at 257,842 units, followed by MMBF170 at 129,798 units. Parts with lower inventory (NX7002AKAR at 7,009 units, BSS138AKAR at 4,385 units) may face supply constraints. For production quantities, MMBF170-7-F or MMBF170 are recommended based on availability and lead time.

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