MMBF170LT3G N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The MMBF170LT3G is an N-Channel 60V 500mA surface mount MOSFET manufactured by onsemi in SOT-23-3 (TO-236) packaging. This device is classified as obsolete product status. The MMBF170LT3G serves applications requiring low-power switching and signal control in compact form factors. Due to its obsolete classification, equivalent and substitute parts with active product status are necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Drain to Source Voltage (Vdss)	60	V
Continuous Drain Current (Id) @ 25°C	500	mA
Rds On (Max) @ 200mA, 10V	5	Ohm
Vgs(th) (Max) @ 1mA	3	V
Power Dissipation (Max)	225	mW
Input Capacitance (Ciss) @ 10V	60	pF
Operating Temperature Range	-55 to 150	°C
Package Type	SOT-23-3 (TO-236)	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the MMBF170LT3G is determined by the following critical parameters:

Electrical Compatibility Requirements:

Drain to Source Voltage (Vdss) must equal or exceed 60V
Continuous Drain Current (Id) must equal or exceed 500mA for direct replacement
Rds On characteristics must support the application's switching and conduction losses
Gate threshold voltage (Vgs(th)) must be compatible with drive circuitry
Power dissipation capability must accommodate thermal requirements

Mechanical Compatibility Requirements:

Package type must be SOT-23-3 (TO-236) or equivalent pinout
Surface mount configuration required
Moisture sensitivity level must be 1 (Unlimited) or better

Regulatory Compliance:

RoHS3 compliance preferred for new designs
REACH unaffected status required

Substitute parts are grouped into two categories: Direct Equivalents (matching all critical parameters) and Functional Alternatives (meeting electrical requirements with different current or power ratings).

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (mA)	Rds On @ 10V (Ohm)	Vgs(th) (V)	Power Diss. (mW)	Ciss @ 10V (pF)	Package	Product Status
MMBF170LT3G	onsemi	60	500	5	3	225	60	SOT-23-3	Obsolete
MMBF170LT1G	onsemi	60	500	5	3	225	60	SOT-23-3	Active
MMBF170	onsemi	60	500	5	3	300	40	SOT-23-3	Active
MMBF170-7-F	Diodes Incorporated	60	500	5	3	300	40	SOT-23-3	Active
FDN5630	onsemi	60	1700	0.1	3	500	400	SOT-23-3	Active
2N7002,215	Nexperia USA Inc.	60	300	5	2.5	830	50	TO-236AB	Active
BS170FTA	Diodes Incorporated	60	150	5	3	330	60	SOT-23-3	Active
SN7002NH6433XTMA1	Infineon Technologies	60	200	5	1.8	360	45	SOT-23-3	Active
PMBF170,215	Nexperia USA Inc.	60	300	5	2	830	40	TO-236AB	Not For New Designs
PMBF170,235	Nexperia USA Inc.	60	300	5	2	830	40	TO-236AB	Not For New Designs

Engineering Selection Recommendations

Tier 1: Direct Equivalents (Recommended for Replacement)

MMBF170LT1G (onsemi) is the primary equivalent for MMBF170LT3G. Both parts share identical electrical specifications (60V, 500mA, 5Ohm Rds On, 3V Vgs(th), 225mW power dissipation) and package configuration (SOT-23-3). MMBF170LT1G carries active product status and RoHS3 compliance, making it suitable for new designs and production continuity.

MMBF170 (onsemi) provides equivalent functionality with active product status. Power dissipation increases to 300mW and input capacitance reduces to 40pF, representing acceptable trade-offs for applications not thermally constrained. RoHS3 compliance confirmed.

MMBF170-7-F (Diodes Incorporated) offers identical electrical performance to MMBF170 with active product status and RoHS3 compliance. This part provides supply diversification from an alternative manufacturer while maintaining electrical compatibility.

Tier 2: Functional Alternatives (Current-Limited Applications)

2N7002,215 (Nexperia USA Inc.) operates at 60V with reduced continuous drain current of 300mA. This part is suitable for applications where the full 500mA rating is not required. Rds On remains 5Ohm at the specified test condition. Product status is active with RoHS3 compliance.

PMBF170,215 and PMBF170,235 (Nexperia USA Inc.) both provide 300mA continuous drain current at 60V with 5Ohm Rds On. Both carry "Not For New Designs" status and should not be selected for new product development.

Tier 3: Current-Enhanced Alternative

FDN5630 (onsemi) provides significantly higher continuous drain current (1.7A) at 60V with lower Rds On (0.1Ohm @ 1.7A, 10V). This part is suitable for applications requiring higher current capacity or lower conduction losses. Input capacitance increases to 400pF. Product status is active with RoHS3 compliance.

Tier 4: Current-Reduced Alternatives

BS170FTA (Diodes Incorporated) and SN7002NH6433XTMA1 (Infineon Technologies) provide reduced continuous drain current ratings (150mA and 200mA respectively) at 60V. These parts are suitable only for applications with lower current requirements. Both carry active product status and RoHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can MMBF170LT1G directly replace MMBF170LT3G in existing designs?

A: Yes. MMBF170LT1G is electrically and mechanically identical to MMBF170LT3G. Both devices feature 60V Vdss, 500mA continuous drain current, 5Ohm Rds On at 10V, and SOT-23-3 packaging. The primary difference is product status: MMBF170LT1G is active while MMBF170LT3G is obsolete. No circuit modifications are required.

Q: What is the difference between MMBF170 and MMBF170LT1G?

A: Both parts share the same electrical specifications for voltage (60V), current (500mA), and on-resistance (5Ohm). MMBF170 has slightly higher power dissipation (300mW vs. 225mW) and lower input capacitance (40pF vs. 60pF). These differences are acceptable for most applications. Both are active products with RoHS3 compliance.

Q: Can FDN5630 replace MMBF170LT3G?

A: FDN5630 is electrically compatible at the voltage level (60V Vdss) but provides higher current capacity (1.7A vs. 500mA) and significantly lower on-resistance (0.1Ohm vs. 5Ohm). FDN5630 is suitable for applications requiring higher current handling or lower conduction losses. Package type is identical (SOT-23-3). Selection depends on application requirements.

Q: Why are PMBF170,215 and PMBF170,235 not recommended?

A: Both parts carry "Not For New Designs" product status. While electrically functional at 300mA continuous drain current and 60V, they should not be selected for new product development. MMBF170LT1G or MMBF170 are preferred alternatives with active product status.

Q: What is the significance of the SOT-23-3 package specification?

A: SOT-23-3 (also designated TO-236-3 or SC-59) is a three-pin surface mount package with standardized pinout: Gate, Drain, and Source. All recommended substitutes use this identical package, ensuring mechanical and electrical compatibility without PCB redesign. Pinout compatibility is guaranteed across all listed alternatives.

Q: Are all substitute parts RoHS3 compliant?

A: All active product status parts listed (MMBF170LT1G, MMBF170, MMBF170-7-F, FDN5630, 2N7002,215, BS170FTA, and SN7002NH6433XTMA1) are RoHS3 compliant. Parts with "Not For New Designs" status (PMBF170,215 and PMBF170,235) are also RoHS3 compliant but should not be selected for new designs.

Q: What drain current rating should I select for my application?

A: Select a substitute part with continuous drain current (Id) equal to or greater than your application's maximum sustained drain current. MMBF170LT1G and MMBF170 provide 500mA matching the original specification. FDN5630 provides 1.7A for higher-current applications. 2N7002,215, PMBF170 variants, BS170FTA, and SN7002NH6433XTMA1 provide reduced current ratings (300mA, 300mA, 150mA, and 200mA respectively) suitable only for lower-current applications.

Q: How do I verify thermal compatibility when substituting parts?

A: Compare power dissipation ratings and on-resistance specifications. MMBF170LT3G and MMBF170LT1G both specify 225mW maximum power dissipation. MMBF170 and MMBF170-7-F specify 300mW. FDN5630 specifies 500mW but operates at lower on-resistance (0.1Ohm), potentially reducing actual dissipation in high-current applications. Verify that your PCB thermal design accommodates the selected part's power dissipation rating.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message