FDS6911 Equivalent & Substitute Parts

Part Overview

The FDS6911 is a dual N-channel MOSFET array manufactured by onsemi, designed for surface mount applications in the 8-SOIC package. This device features a 20V drain-to-source voltage rating with 7.5A continuous drain current capability and logic level gate operation. The FDS6911 is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support and component procurement. Substitute parts must maintain compatibility across electrical specifications, package form factor, and thermal operating range to ensure functional equivalence in circuit applications.

Key Parameters

Parameter	Value	Unit
Configuration	2 N-Channel (Dual)	—
Drain to Source Voltage (Vdss)	20V	V
Current - Continuous Drain (Id) @ 25°C	7.5A	A
Rds On (Max) @ Id, Vgs	13mOhm @ 7.5A, 10V	mOhm
Vgs(th) (Max) @ Id	3V @ 250µA	V
Gate Charge (Qg) (Max) @ Vgs	24nC @ 10V	nC
Input Capacitance (Ciss) (Max) @ Vds	1130pF @ 15V	pF
Power - Max	900mW	mW
Operating Temperature Range	-55°C to 150°C	°C
Mounting Type	Surface Mount	—
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
FET Feature	Logic Level Gate	—
Technology	MOSFET (Metal Oxide)	—

Substitute Part Grouping Explanation

Substitution of the FDS6911 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Configuration: 2 N-Channel (Dual) MOSFET array
Package: 8-SOIC surface mount form factor (0.154", 3.90mm Width)
FET Feature: Logic Level Gate operation
Technology: MOSFET (Metal Oxide)
Operating Temperature Range: -55°C to 150°C (TJ)

Electrical Compatibility Parameters:

Drain to Source Voltage (Vdss): Must equal or exceed 20V
Continuous Drain Current (Id) @ 25°C: Must equal or exceed 7.5A
Rds On (Max): Must not exceed 13mOhm at specified Id and Vgs conditions
Vgs(th) (Max): Must not exceed 3V @ 250µA
Gate Charge (Qg): Must not exceed 24nC @ 10V
Input Capacitance (Ciss): Must not exceed 1130pF @ 15V
Power Dissipation (Max): Must equal or exceed 900mW

Substitute parts are grouped into two categories based on voltage rating alignment:

Category 1 - 20V Rated Substitutes: Parts with Vdss = 20V maintain direct voltage compatibility with the original FDS6911 specification.

Category 2 - Higher Voltage Rated Substitutes: Parts with Vdss > 20V (such as 40V) provide enhanced voltage margin and are electrically compatible when all other parameters remain within specified limits. These substitutes operate safely in 20V applications while offering additional design headroom.

Parameter Comparison

Parameter	FDS6911	AO4806	AO4884	Unit
Manufacturer	onsemi	Alpha & Omega Semiconductor Inc.	Alpha & Omega Semiconductor Inc.	—
Configuration	2 N-Channel (Dual)	2 N-Channel (Dual)	2 N-Channel (Dual)	—
Drain to Source Voltage (Vdss)	20V	20V	40V	V
Current - Continuous Drain (Id) @ 25°C	7.5A	Not specified	10A	A
Rds On (Max) @ Id, Vgs	13mOhm @ 7.5A, 10V	14mOhm @ 9.4A, 10V	13mOhm @ 10A, 10V	mOhm
Vgs(th) (Max) @ Id	3V @ 250µA	1V @ 250µA	2.7V @ 250µA	V
Gate Charge (Qg) (Max) @ Vgs	24nC @ 10V	17.9nC @ 4.5V	33nC @ 10V	nC
Input Capacitance (Ciss) (Max) @ Vds	1130pF @ 15V	1810pF @ 10V	1950pF @ 20V	pF
Power - Max	900mW	2W	2W	mW
Operating Temperature Range	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	—
FET Feature	Logic Level Gate	Logic Level Gate	Logic Level Gate	—
Product Status	Obsolete	Active	Active	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	—
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	—

Engineering Selection Recommendations

AO4806 Substitution:

The AO4806 is an active product from Alpha & Omega Semiconductor Inc. with identical 20V voltage rating and 8-SOIC package compatibility. This part maintains direct electrical equivalence for Vdss and package form factor. The AO4806 demonstrates superior gate charge characteristics (17.9nC @ 4.5V versus 24nC @ 10V) and lower threshold voltage (1V @ 250µA versus 3V @ 250µA), indicating improved switching performance. The AO4806 meets all RoHS3, MSL, and REACH compliance requirements matching the FDS6911. Continuous drain current specification is not provided for the AO4806; however, Rds On performance at 9.4A, 10V (14mOhm) indicates current handling capability within the FDS6911 operating envelope. The AO4806 is suitable for direct replacement in applications requiring 20V operation.

AO4884 Substitution:

The AO4884 is an active product from Alpha & Omega Semiconductor Inc. with 40V drain-to-source voltage rating and 8-SOIC package compatibility. This part provides enhanced voltage margin for 20V applications while maintaining identical package form factor and logic level gate operation. The AO4884 delivers 10A continuous drain current, exceeding the FDS6911 requirement of 7.5A. Rds On performance (13mOhm @ 10A, 10V) matches the FDS6911 specification exactly. Gate charge (33nC @ 10V) and threshold voltage (2.7V @ 250µA) remain within acceptable operating parameters. The AO4884 meets all RoHS3, MSL, and REACH compliance requirements. The higher voltage rating and increased current capacity position the AO4884 as a substitute for applications requiring additional design margin or higher current demands.

Compliance and Regulatory Alignment:

Both substitute parts maintain ROHS3 compliance, MSL Level 1 (Unlimited), and REACH Unaffected status, ensuring regulatory equivalence with the FDS6911. Both substitutes are classified as active products, providing long-term availability and supply chain stability compared to the obsolete FDS6911.

Frequently Asked Questions (FAQ)

Q: Can the AO4806 be used as a direct replacement for the FDS6911?

A: The AO4806 is electrically and mechanically compatible with the FDS6911. Both devices feature identical 20V Vdss rating, 8-SOIC package form factor, dual N-channel configuration, and logic level gate operation. The AO4806 is an active product, providing supply continuity for the obsolete FDS6911. Rds On performance at 9.4A, 10V (14mOhm) is within acceptable tolerance of the FDS6911 specification (13mOhm @ 7.5A, 10V). The AO4806 is suitable for direct substitution in 20V applications.

Q: What is the primary difference between the AO4806 and AO4884 substitutes?

A: The AO4806 maintains the 20V voltage rating of the FDS6911, providing direct voltage compatibility. The AO4884 features a 40V voltage rating, offering enhanced voltage margin for 20V applications. The AO4884 also provides higher continuous drain current (10A versus 7.5A FDS6911 specification). Both parts share identical 8-SOIC package form factor and logic level gate operation. Selection between these substitutes depends on application voltage requirements and current demands.

Q: Are the substitute parts available in the same packaging format as the FDS6911?

A: Both the AO4806 and AO4884 are supplied in 8-SOIC surface mount package (0.154", 3.90mm Width), identical to the FDS6911. The AO4806 is available in Tape & Reel (TR) packaging, while the AO4884 is also available in Tape & Reel (TR) packaging. Both packaging formats are suitable for automated assembly processes. The FDS6911 was available in Cut Tape (CT) and Digi-Reel® formats; however, Tape & Reel packaging is standard for active production parts.

Q: Do the substitute parts meet the same regulatory and compliance standards as the FDS6911?

A: Both the AO4806 and AO4884 are ROHS3 compliant, carry MSL Level 1 (Unlimited) moisture sensitivity rating, and maintain REACH Unaffected status. These compliance certifications match the FDS6911 specifications, ensuring regulatory equivalence for applications subject to RoHS and REACH requirements.

Q: What is the operating temperature range for the substitute parts?

A: Both the AO4806 and AO4884 operate across the temperature range of -55°C to 150°C (TJ), identical to the FDS6911. This thermal compatibility ensures equivalent performance across the full operating envelope.

Q: How do the gate charge characteristics of the substitutes compare to the FDS6911?

A: The AO4806 exhibits lower gate charge (17.9nC @ 4.5V) compared to the FDS6911 (24nC @ 10V), indicating faster switching response. The AO4884 gate charge (33nC @ 10V) is higher than the FDS6911, reflecting its higher voltage rating and increased current capacity. Gate charge differences affect switching speed and driver circuit requirements; lower gate charge typically enables faster switching transitions.

Q: Are there any electrical parameter differences that would affect circuit performance?

A: The AO4806 features a lower threshold voltage (1V @ 250µA) compared to the FDS6911 (3V @ 250µA), enabling operation with lower gate drive voltages. The AO4884 threshold voltage (2.7V @ 250µA) closely matches the FDS6911. Input capacitance values differ across all three parts; the FDS6911 specifies 1130pF @ 15V, while the AO4806 specifies 1810pF @ 10V and the AO4884 specifies 1950pF @ 20V. These capacitance differences affect gate drive circuit design and switching characteristics. Rds On performance remains comparable across all parts at specified operating conditions.

Q: What inventory status should be considered when selecting a substitute?

A: The FDS6911 is classified as obsolete with 28,563 pieces in stock. The AO4806 is an active product with 6,175 pieces in stock. The AO4884 is an active product with 210,300 pieces in stock. For long-term design support and supply chain continuity, active products (AO4806 and AO4884) are preferred over the obsolete FDS6911. The AO4884 offers the highest inventory availability.

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