FDS6930A MOSFET Equivalent & Substitute Parts

Part Overview

The FDS6930A is a dual N-channel MOSFET manufactured by onsemi in the PowerTrench® series, rated for 30V drain-to-source voltage with 5.5A continuous drain current. The device is housed in an 8-SOIC surface mount package and features logic level gate operation suitable for low-voltage switching applications. The FDS6930A is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design support and production continuity.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	30	V
Continuous Drain Current (Id) @ 25°C	5.5	A
On-Resistance (Rds On) @ 5.5A, 10V	40	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	3	V
Gate Charge (Qg) @ 5V	7	nC
Input Capacitance (Ciss) @ 15V	460	pF
Maximum Power Dissipation	900	mW
Operating Temperature Range	-55 to 150	°C
Package Type	8-SOIC
Configuration	2 N-Channel (Dual)

Substitute Part Grouping Explanation

Substitution of the FDS6930A is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Drain-to-source voltage rating (Vdss) must equal or exceed 30V
Continuous drain current (Id) must support 5.5A or higher
On-resistance (Rds On) must not exceed the specified maximum to maintain thermal performance
Gate threshold voltage (Vgs(th)) must be compatible with logic level gate operation
Operating temperature range must encompass -55°C to 150°C

Mechanical Compatibility Criteria:

Package type must be 8-SOIC surface mount
Dual N-channel configuration required
Pin-to-pin compatibility with 8-SOIC footprint

Substitute parts are grouped into two categories: direct equivalents (matching all primary electrical specifications) and similar alternatives (meeting voltage and current requirements with acceptable parameter variations).

Parameter Comparison

Parameter	FDS6930A	FDS6930B	AO4842	SI4936ADY-T1-GE3	ZXMN3A06DN8TA
Manufacturer	onsemi	onsemi	Alpha & Omega Semiconductor Inc.	Vishay Siliconix	Diodes Incorporated
Vdss (V)	30	30	30	30	30
Id @ 25°C (A)	5.5	5.5	—	4.4	4.9
Rds On (mOhm)	40 @ 5.5A, 10V	38 @ 5.5A, 10V	22 @ 7.5A, 10V	36 @ 5.9A, 10V	35 @ 9A, 10V
Vgs(th) (V)	3 @ 250µA	3 @ 250µA	2.6 @ 250µA	3 @ 250µA	1 @ 250µA (Min)
Qg (nC)	7 @ 5V	3.8 @ 5V	11 @ 10V	20 @ 10V	17.5 @ 10V
Ciss (pF)	460 @ 15V	412 @ 15V	448 @ 15V	—	796 @ 25V
Power Max (W)	0.9	0.9	2	1.1	1.8
Operating Temp (°C)	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150
Package	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Configuration	2 N-Channel	2 N-Channel	2 N-Channel	2 N-Channel	2 N-Channel
Product Status	Obsolete	Last Time Buy	Not For New Designs	Active	Active
RoHS Compliance	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3

Engineering Selection Recommendations

Direct Equivalent Substitution:

FDS6930B is the primary direct equivalent to FDS6930A. Both devices are manufactured by onsemi within the PowerTrench® series and share identical electrical ratings for Vdss (30V), Id (5.5A), and operating temperature range (-55°C to 150°C). FDS6930B demonstrates improved performance characteristics with lower on-resistance (38 mOhm versus 40 mOhm) and reduced gate charge (3.8 nC versus 7 nC), resulting in lower switching losses. FDS6930B carries Last Time Buy status, indicating limited availability; however, it remains the most direct functional replacement with 60,200 units in stock.

Alternative Substitutes for Active Production:

SI4936ADY-T1-GE3 (Vishay Siliconix, Active status) and ZXMN3A06DN8TA (Diodes Incorporated, Active status) are suitable alternatives for new designs requiring long-term component availability. Both devices maintain 30V Vdss rating and -55°C to 150°C operating temperature compatibility. SI4936ADY-T1-GE3 supports 4.4A continuous drain current with 36 mOhm on-resistance, while ZXMN3A06DN8TA supports 4.9A continuous drain current with 35 mOhm on-resistance. Both alternatives exceed the thermal performance of the original FDS6930A (1.1W and 1.8W maximum power dissipation respectively, compared to 0.9W).

AO4842 (Alpha & Omega Semiconductor Inc., Not For New Designs status) meets voltage and package requirements but carries a product status designation restricting use in new designs. This part is not recommended for new development initiatives.

All substitute parts maintain ROHS3 compliance, MSL Level 1 (Unlimited moisture sensitivity), and 8-SOIC surface mount packaging, ensuring mechanical and environmental compatibility with the original FDS6930A footprint.

Frequently Asked Questions (FAQ)

Q: Can FDS6930B be used as a direct replacement for FDS6930A in existing designs?

A: Yes. FDS6930B is a direct equivalent with identical voltage (30V), current (5.5A), and temperature ratings (-55°C to 150°C). Both devices feature 8-SOIC packaging and dual N-channel configuration. FDS6930B actually provides improved electrical performance with lower on-resistance and gate charge. Pin-to-pin compatibility is maintained.

Q: What is the difference between FDS6930A and SI4936ADY-T1-GE3?

A: Both devices share 30V Vdss rating, 8-SOIC packaging, and -55°C to 150°C operating range. The primary difference is continuous drain current: FDS6930A supports 5.5A while SI4936ADY-T1-GE3 supports 4.4A. SI4936ADY-T1-GE3 offers higher maximum power dissipation (1.1W versus 0.9W) and lower on-resistance (36 mOhm versus 40 mOhm). SI4936ADY-T1-GE3 is suitable for applications where the 4.4A current rating is sufficient and long-term availability is required.

Q: Why is AO4842 listed as "Not For New Designs"?

A: AO4842 carries a product status designation of "Not For New Designs," indicating the manufacturer has discontinued active support for this component in new applications. While AO4842 meets the electrical and mechanical requirements for substitution, it should not be selected for designs intended for long-term production or new development. FDS6930B, SI4936ADY-T1-GE3, or ZXMN3A06DN8TA are preferred alternatives.

Q: Are all substitute parts available in the same packaging?

A: Yes. All substitute parts listed (FDS6930B, AO4842, SI4936ADY-T1-GE3, and ZXMN3A06DN8TA) are available in 8-SOIC surface mount packaging with identical footprint dimensions (0.154" width, 3.90mm). Pin-to-pin compatibility is maintained across all alternatives.

Q: What is the significance of gate charge (Qg) differences between substitute parts?

A: Gate charge affects switching speed and driver power requirements. FDS6930B has the lowest gate charge (3.8 nC), resulting in faster switching and lower driver losses. ZXMN3A06DN8TA has the highest gate charge (17.5 nC), requiring more driver current but still within acceptable limits for standard gate driver circuits. Gate charge differences do not prevent substitution but may affect circuit performance in high-frequency switching applications.

Q: Can ZXMN3A06DN8TA replace FDS6930A in all applications?

A: ZXMN3A06DN8TA meets the critical electrical requirements: 30V Vdss, 4.9A continuous drain current (exceeding the 5.5A requirement is acceptable), and -55°C to 150°C operating temperature. The 8-SOIC package is identical. However, ZXMN3A06DN8TA has a lower gate threshold voltage (1V minimum versus 3V), which may affect gate drive circuit design. Verification of gate drive compatibility is necessary before substitution in existing designs.

Q: What is the inventory status of substitute parts?

A: FDS6930B has 60,200 units in stock (Last Time Buy status). SI4936ADY-T1-GE3 has 734 units in stock (Active status). ZXMN3A06DN8TA has 32,900 units in stock (Active status). AO4842 has 210,200 units in stock (Not For New Designs status). For long-term production requirements, SI4936ADY-T1-GE3 and ZXMN3A06DN8TA are recommended due to Active product status.

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