FDC645N_F095 Equivalent & Substitute Parts

Part Overview

The FDC645N_F095 is an N-Channel 30V 5.5A MOSFET manufactured by onsemi in the PowerTrench® series, housed in a SuperSOT™-6 package. This part is classified as obsolete, indicating it has reached end-of-life status and is no longer recommended for new designs. The obsolete designation necessitates identification of active equivalent and substitute components that maintain functional compatibility while offering continued availability and support.

Key Parameters

Parameter	Value
Manufacturer Part Number	FDC645N_F095
Manufacturer	onsemi
FET Type	N-Channel
Drain to Source Voltage (Vdss)	30 V
Continuous Drain Current (Id) @ 25°C	5.5A (Ta)
Rds On (Max) @ Id, Vgs	26mOhm @ 6.2A, 10V
Gate Charge (Qg) (Max) @ Vgs	21 nC @ 4.5 V
Input Capacitance (Ciss) (Max) @ Vds	1460 pF @ 15 V
Power Dissipation (Max)	1.6W (Ta)
Operating Temperature Range	-55°C ~ 150°C (TJ)
Package / Case	SOT-23-6 Thin, TSOT-23-6
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the FDC645N_F095 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Drain to Source Voltage (Vdss): 30 V (exact match required)
FET Type: N-Channel (exact match required)
Continuous Drain Current (Id): 5.5A or greater
Rds On (Max): 26mOhm or lower at specified conditions
Gate Charge (Qg): 21 nC or lower
Input Capacitance (Ciss): 1460 pF or lower
Power Dissipation: 1.6W or greater
Operating Temperature: -55°C to 150°C minimum
Package: SOT-23-6 Thin or TSOT-23-6 (surface mount compatibility)

Substitution Categories:

Direct Equivalent: FDC645N (onsemi) — Identical electrical specifications with active product status and improved availability.

Functional Equivalents: Parts meeting or exceeding all primary electrical parameters while maintaining package compatibility and operating temperature range. These include DMG6402LVT-7 (Diodes Incorporated), RTQ045N03TR (Rohm Semiconductor), and RSQ045N03TR (Rohm Semiconductor).

Partial Equivalents: Parts with reduced continuous drain current or other parameter trade-offs. These include RTQ035N03TR, RTQ020N03TR, RSQ020N03TR, and RSQ045N03TR, suitable only for applications with lower current requirements.

Parameter Comparison

Parameter	FDC645N_F095	FDC645N	DMG6402LVT-7	RTQ045N03TR	RSQ045N03TR	RTQ035N03TR
Manufacturer	onsemi	onsemi	Diodes Inc.	Rohm Semi.	Rohm Semi.	Rohm Semi.
Vdss (V)	30	30	30	30	30	30
Id @ 25°C (A)	5.5	5.5	6.0	4.5	4.5	3.5
Rds On (Max) (mOhm)	26 @ 6.2A, 10V	26 @ 6.2A, 10V	30 @ 7A, 10V	43 @ 4.5A, 4.5V	38 @ 4.5A, 10V	54 @ 3.5A, 4.5V
Qg (Max) (nC)	21 @ 4.5V	21 @ 4.5V	11.4 @ 10V	10.7 @ 4.5V	9.5 @ 5V	6.4 @ 4.5V
Ciss (Max) (pF)	1460 @ 15V	1460 @ 15V	498 @ 15V	540 @ 10V	520 @ 10V	285 @ 10V
Power Dissipation (W)	1.6	1.6	1.75	1.25	0.6	1.25
Operating Temp (°C)	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150
Package	SOT-23-6, TSOT-23-6	SOT-23-6, TSOT-23-6	SOT-23-6, TSOT-23-6	SOT-23-6, TSOT-23-6	SOT-23-6, TSOT-23-6	SOT-23-6, TSOT-23-6
Product Status	Obsolete	Active	Active	Not For New Designs	Active	Not For New Designs
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: FDC645N (onsemi)

The FDC645N is the direct equivalent of the FDC645N_F095, offering identical electrical specifications with active product status. This part maintains the same 30V Vdss, 5.5A continuous drain current, 26mOhm Rds On, and 1.6W power dissipation. The FDC645N is ROHS3 compliant and available in Cut Tape and Digi-Reel® packaging with 23,400 units in stock. This part is the preferred choice for direct replacement in existing designs.

Secondary Recommendation: DMG6402LVT-7 (Diodes Incorporated)

The DMG6402LVT-7 provides enhanced performance with 6A continuous drain current and 1.75W power dissipation, exceeding the original specification. It maintains 30V Vdss and achieves lower gate charge (11.4 nC) and input capacitance (498 pF), resulting in improved switching characteristics. This part is ROHS3 compliant and actively produced with 46,770 units in stock. Selection of this part is appropriate for applications requiring higher current capability or improved thermal performance.

Tertiary Recommendation: RSQ045N03TR (Rohm Semiconductor)

The RSQ045N03TR matches the 4.5A continuous drain current specification with 30V Vdss and is actively produced. This part is ROHS3 compliant with 17,933 units in stock. However, the reduced continuous drain current (4.5A versus 5.5A) and lower power dissipation (600mW) limit its application to designs with lower current requirements.

Not Recommended for New Designs:

RTQ045N03TR and RTQ035N03TR carry "Not For New Designs" status and should not be selected for new applications despite meeting certain electrical parameters.

Frequently Asked Questions (FAQ)

Q: Can FDC645N directly replace FDC645N_F095 in existing PCB layouts?

A: Yes. The FDC645N is electrically and mechanically identical to the FDC645N_F095, with both using SOT-23-6 Thin or TSOT-23-6 packages. No layout modifications are required.

Q: What is the primary difference between FDC645N and DMG6402LVT-7?

A: Both parts operate at 30V Vdss and are pin-compatible in SOT-23-6 packages. The DMG6402LVT-7 offers higher continuous drain current (6A versus 5.5A), lower gate charge (11.4 nC versus 21 nC), and lower input capacitance (498 pF versus 1460 pF). These characteristics result in faster switching and improved thermal performance. The trade-off is slightly higher Rds On (30mOhm versus 26mOhm).

Q: Are RTQ045N03TR and RSQ045N03TR suitable replacements?

A: RTQ045N03TR is not recommended for new designs despite meeting the 4.5A current specification. RSQ045N03TR is actively produced and meets the 4.5A specification; however, its 600mW power dissipation is significantly lower than the original 1.6W, limiting thermal headroom in power-intensive applications.

Q: What does "Not For New Designs" status mean?

A: Parts designated "Not For New Designs" are in mature or declining production phases. While functional, they are not recommended for incorporation into new product designs. These parts may have limited future availability or support.

Q: Can I use RSQ020N03TR or RTQ020N03TR as substitutes?

A: These parts are not suitable direct replacements. Both are rated for only 2A continuous drain current, significantly below the 5.5A requirement of the FDC645N_F095. Use of these parts would result in thermal stress and potential device failure in applications designed for 5.5A operation.

Q: What is the significance of the ROHS3 compliance designation?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All recommended active substitutes carry ROHS3 compliance, ensuring regulatory alignment with modern manufacturing standards.

Q: Are there package compatibility concerns between substitute parts?

A: All recommended substitutes use SOT-23-6 Thin or TSOT-23-6 packages, maintaining mechanical and electrical pin compatibility. No package-related modifications to PCB layouts are required.

Q: What inventory considerations should guide part selection?

A: FDC645N offers the highest inventory availability (23,400 units) among direct equivalents. DMG6402LVT-7 provides the second-highest availability (46,770 units) with enhanced performance characteristics. Both parts support immediate procurement without supply chain delays.

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