AO6804 Equivalent & Substitute Parts

Part Overview

The AO6804 is a dual N-channel MOSFET array manufactured by Alpha & Omega Semiconductor Inc., designed for surface mount applications in logic-level gate switching circuits. This device features a 20V drain-to-source voltage rating with 4A continuous drain current capability and is housed in a 6-TSOP package. The AO6804 is classified as obsolete, necessitating identification of functionally equivalent active alternatives for new designs and ongoing production requirements.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	20	V
Current - Continuous Drain (Id) @ 25°C	4	A
Rds On (Max)	32	mOhm
Vgs(th) (Max)	1.2	V
Gate Charge (Qg) (Max)	7.7	nC
Input Capacitance (Ciss) (Max)	725	pF
Power - Max	800	mW
Operating Temperature Range	-55 to 150	°C
Configuration	2 N-Channel (Dual) Common Drain	—
FET Feature	Logic Level Gate	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the AO6804 is based on electrical and mechanical parameter compatibility within the dual N-channel MOSFET category. The following criteria determine valid substitutes:

Electrical Compatibility Requirements:

Drain to Source Voltage (Vdss) rating of 20V or greater
Continuous Drain Current (Id) rating of 4A or greater at 25°C
Logic Level Gate configuration for direct gate drive compatibility
Dual N-channel common drain configuration
Operating temperature range encompassing -55°C to 150°C

Mechanical Compatibility Requirements:

Surface mount technology
Pin count and functional pinout compatibility with 6-pin packages

The DMG9926UDM-7 meets all electrical and mechanical substitution criteria, with enhanced performance characteristics in current rating (4.2A), power dissipation (980mW), and on-resistance (28mOhm).

Parameter Comparison

Parameter	AO6804	DMG9926UDM-7	Unit
Manufacturer	Alpha & Omega Semiconductor Inc.	Diodes Incorporated	—
Product Status	Obsolete	Active	—
Drain to Source Voltage (Vdss)	20	20	V
Current - Continuous Drain (Id) @ 25°C	4	4.2	A
Rds On (Max)	32	28	mOhm
Vgs(th) (Max)	1.2	0.9	V
Gate Charge (Qg) (Max)	7.7	8.3	nC
Input Capacitance (Ciss) (Max)	725	856	pF
Power - Max	800	980	mW
Operating Temperature Range	-55 to 150	-55 to 150	°C
Configuration	2 N-Channel (Dual) Common Drain	2 N-Channel (Dual) Common Drain	—
FET Feature	Logic Level Gate	Logic Level Gate	—
Mounting Type	Surface Mount	Surface Mount	—
Package / Case	SC-74, SOT-457 (6-TSOP)	SOT-23-6 (SOT-26)	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	—
REACH Status	REACH Unaffected	REACH Unaffected	—
ECCN	EAR99	EAR99	—

Engineering Selection Recommendations

The DMG9926UDM-7 is the qualified substitute for the obsolete AO6804. Selection of this alternative is supported by the following factors:

Product Status: The AO6804 is classified as obsolete, while the DMG9926UDM-7 maintains active product status with ongoing manufacturer support and availability.

Regulatory Compliance: Both devices maintain identical REACH and ECCN classifications (REACH Unaffected, EAR99), ensuring no change in regulatory handling or export requirements. The DMG9926UDM-7 carries RoHS3 compliance certification, providing additional environmental compliance assurance.

Electrical Performance: The DMG9926UDM-7 exceeds the electrical specifications of the AO6804 across all critical parameters. The substitute provides higher continuous drain current (4.2A versus 4A), improved on-resistance (28mOhm versus 32mOhm), and increased power dissipation capability (980mW versus 800mW). The lower gate threshold voltage (900mV versus 1.2V) enhances logic-level gate drive compatibility.

Thermal and Environmental Compatibility: Both devices operate across the identical temperature range (-55°C to 150°C), ensuring thermal performance equivalence in target applications.

Packaging Consideration: The DMG9926UDM-7 uses SOT-23-6 packaging (SOT-26 supplier designation) compared to the AO6804's SC-74 (6-TSOP) packaging. Both are six-pin surface mount packages with common drain configuration. PCB layout modifications may be required to accommodate the different package footprints.

Frequently Asked Questions (FAQ)

Q: Can the DMG9926UDM-7 directly replace the AO6804 without circuit modifications?

A: The DMG9926UDM-7 is electrically compatible with the AO6804 and will function in circuits designed for the original device. However, the package footprint differs (SOT-23-6 versus SC-74/6-TSOP), requiring PCB layout changes. Pin functionality and electrical characteristics are compatible.

Q: What are the key electrical differences between these devices?

A: The DMG9926UDM-7 provides superior electrical performance: 5% higher continuous drain current (4.2A versus 4A), 12.5% lower on-resistance (28mOhm versus 32mOhm), 25% lower gate threshold voltage (900mV versus 1.2V), and 22.5% higher power dissipation rating (980mW versus 800mW). These improvements enhance switching efficiency and thermal margin.

Q: Are there any compliance or certification differences?

A: Both devices maintain REACH Unaffected and EAR99 classifications. The DMG9926UDM-7 additionally carries RoHS3 compliance certification, which the AO6804 does not specify. Both devices have MSL 1 (Unlimited) moisture sensitivity ratings.

Q: What packaging considerations apply to this substitution?

A: The AO6804 uses 6-TSOP (SC-74) packaging, while the DMG9926UDM-7 uses SOT-26 (SOT-23-6) packaging. Both are six-pin surface mount packages with identical pin functionality and common drain configuration. PCB footprint redesign is necessary for physical compatibility.

Q: Is the DMG9926UDM-7 suitable for new design implementations?

A: Yes. The DMG9926UDM-7 is an active product with ongoing manufacturer support, making it the appropriate choice for new designs requiring dual N-channel logic-level MOSFETs in the 20V/4A class.

Q: How do the thermal characteristics compare?

A: Both devices operate across -55°C to 150°C junction temperature range. The DMG9926UDM-7's higher power dissipation rating (980mW versus 800mW) provides additional thermal margin in power-limited applications.

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