AO6403 P-Channel MOSFET 30V 6A Equivalent & Substitute Parts

Part Overview

The AO6403 is a P-Channel enhancement-mode MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 30V drain-to-source voltage and 6A continuous drain current in a 6-TSOP surface mount package. This device is classified as "Not For New Designs," indicating it has reached end-of-life status. Identification of equivalent and substitute parts is necessary for design continuity, inventory management, and ongoing production support for existing applications utilizing this component.

Key Parameters

Parameter	Value	Unit
FET Type	P-Channel	—
Drain-to-Source Voltage (Vdss)	30	V
Continuous Drain Current (Id) @ 25°C	6	A
On-Resistance (Rds On) @ 6A, 10V	35	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	2.4	V
Gate Charge (Qg) @ 10V	18.5	nC
Power Dissipation (Max)	2	W
Operating Temperature Range	-55 to 150	°C
Package Type	6-TSOP (SC-74, SOT-457)	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the AO6403 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): Must equal or exceed 30V
Continuous Drain Current (Id): Must equal or exceed 6A at 25°C
On-Resistance (Rds On): Lower or equivalent values ensure comparable performance
Gate Threshold Voltage (Vgs(th)): Must be compatible with existing gate drive circuits
Power Dissipation: Must support thermal requirements of the application
Operating Temperature Range: Must encompass -55°C to 150°C
Package Compatibility: Surface mount packages with compatible pinouts and thermal characteristics

Substitution Categories:

Category 1: Direct Electrical Equivalents (Same Vdss, Id ≥ 6A) Parts meeting or exceeding the 30V/6A specification with comparable Rds On and thermal performance.

Category 2: Reduced Current Alternatives (Same Vdss, Id < 6A) Parts suitable for applications where the full 6A rating is not required, with lower power dissipation.

Category 3: Voltage-Reduced Alternatives (Vdss < 30V) Parts with lower voltage ratings, suitable only for applications with reduced voltage requirements.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On @ Rated Id, 10V (mOhm)	Vgs(th) @ 250µA (V)	Qg @ 10V (nC)	Power Dissipation (W)	Package	Product Status
AO6403	Alpha & Omega	30	6	35	2.4	18.5	2	6-TSOP	Not For New Designs
AO6405	Alpha & Omega	30	5	52	3	18	2	6-TSOP	Not For New Designs
AOTS21313C	Alpha & Omega	30	7.3	32	2.2	33	2.7	6-TSOP	Active
CPH6350-TL-W	onsemi	30	6	43	—	13	1.6	6-CPH (SOT-23-6)	Active
DMP3050LVT-7	Diodes Inc.	30	4.5	50	2	10.5	1.8	TSOT-26 (SOT-23-6)	Active
DMP3056LDM-7	Diodes Inc.	30	4.3	45	2.1	21.1	1.25	SOT-26 (SOT-23-6)	Active
FDC610PZ	onsemi	30	4.9	42	3	24	1.6	SuperSOT-6 (SOT-23-6)	Active
FDC658P	onsemi	30	4	50	3	12	1.6	SuperSOT-6 (SOT-23-6)	Active
IRFTS9342TRPBF	Infineon	30	5.8	40	2.4	12	2	6-TSOP (SOT-23-6)	Active
NTGS3443T1G	onsemi	20	2.2	65	1.5	15	0.5	6-TSOP (SOT-23-6)	Active
PJS6403_S1_00001	Panjit Int'l	30	6.4	32	2.5	7.8	2	SOT-23-6	Active

Engineering Selection Recommendations

Primary Recommendation: AOTS21313C

The AOTS21313C from Alpha & Omega Semiconductor Inc. is the preferred substitute for the AO6403. This part exceeds the original specification with 7.3A continuous drain current while maintaining the same 30V Vdss rating and 2.7W power dissipation capability. The 6-TSOP package provides direct mechanical compatibility. Critically, AOTS21313C carries Active product status, ensuring long-term availability and manufacturing support. All regulatory certifications (ROHS3, REACH Unaffected, EAR99) align with the original part.

Secondary Recommendation: IRFTS9342TRPBF

The IRFTS9342TRPBF from Infineon Technologies (HEXFET® series) provides near-equivalent performance with 5.8A continuous drain current at 30V. This part features superior on-resistance (40 mOhm) and lower gate charge (12 nC), resulting in improved switching efficiency. The 6-TSOP package maintains mechanical compatibility. Active product status and full regulatory compliance support production continuity.

Alternative for Reduced Current Applications: DMP3050LVT-7

For applications where 6A continuous current is not required, the DMP3050LVT-7 from Diodes Incorporated offers a lower-power alternative with 4.5A rating at 30V. This part features reduced power dissipation (1.8W) and is available in TSOT-26 packaging. Active product status ensures availability.

Not Recommended: NTGS3443T1G

The NTGS3443T1G operates at 20V maximum Vdss and 2.2A continuous current, falling below the AO6403 electrical specification. This part is unsuitable for applications requiring the full 30V/6A capability.

Frequently Asked Questions (FAQ)

Q: Can the AO6405 directly replace the AO6403?

A: The AO6405 shares the same 30V Vdss rating and 6-TSOP package but is rated for only 5A continuous drain current compared to the AO6403's 6A. Additionally, the AO6405 exhibits higher on-resistance (52 mOhm vs. 35 mOhm), resulting in increased power dissipation. Both parts carry "Not For New Designs" status. The AO6405 is suitable only for applications where 5A current is sufficient.

Q: What is the primary advantage of AOTS21313C over the original AO6403?

A: The AOTS21313C provides higher continuous drain current (7.3A vs. 6A) while maintaining the same 30V voltage rating and 6-TSOP package footprint. Increased power dissipation capability (2.7W vs. 2W) supports higher thermal loads. Most importantly, AOTS21313C carries Active product status, ensuring long-term manufacturing support and availability, whereas AO6403 is end-of-life.

Q: Are package changes acceptable when substituting the AO6403?

A: Package compatibility depends on application requirements. The AO6403 uses 6-TSOP (SC-74, SOT-457) packaging. Substitute parts in SOT-23-6 or TSOT-23-6 packages (such as CPH6350-TL-W, DMP3050LVT-7, FDC610PZ, and IRFTS9342TRPBF) have different physical dimensions and pinout arrangements. PCB layout modifications are required for package changes. Direct 6-TSOP package compatibility is maintained with AOTS21313C and PJS6403_S1_00001.

Q: How does on-resistance (Rds On) affect substitution suitability?

A: On-resistance directly impacts power dissipation and switching losses. The AO6403 specifies 35 mOhm at 6A, 10V. Substitute parts with lower Rds On (such as AOTS21313C at 32 mOhm or IRFTS9342TRPBF at 40 mOhm) reduce conduction losses and heat generation. Higher Rds On values increase power dissipation and may require thermal management adjustments. For applications with tight thermal budgets, lower Rds On values are preferred.

Q: What does "Not For New Designs" status mean for the AO6403?

A: "Not For New Designs" indicates the AO6403 has reached end-of-life and is no longer recommended for new product development. Existing inventory may remain available, but manufacturing support and long-term availability are not guaranteed. Active-status substitutes such as AOTS21313C, IRFTS9342TRPBF, and PJS6403_S1_00001 are recommended for new designs and ongoing production.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this reference carry ROHS3 Compliant certification, matching the original AO6403. All parts are also REACH Unaffected and classified as EAR99 for export control purposes.

Q: Can gate threshold voltage (Vgs(th)) differences affect circuit operation?

A: Gate threshold voltage determines the gate-source voltage required to turn the MOSFET on. The AO6403 specifies 2.4V at 250µA. Substitute parts range from 1.5V (NTGS3443T1G) to 3V (AO6405, FDC610PZ). Differences within ±0.6V are generally compatible with standard gate drive circuits operating at 5V or 10V. However, applications with marginal gate drive voltage should verify compatibility with the specific substitute part's Vgs(th) specification.

Q: What is the significance of gate charge (Qg) in substitution?

A: Gate charge affects switching speed and gate drive power requirements. The AO6403 specifies 18.5 nC at 10V. Lower gate charge (such as 7.8 nC for PJS6403_S1_00001 or 12 nC for IRFTS9342TRPBF) reduces switching losses and gate drive current demands. Higher gate charge (such as 33 nC for AOTS21313C) may require higher gate drive current but does not prevent substitution in most applications.

Q: Is the PJS6403_S1_00001 a direct equivalent to the AO6403?

A: The PJS6403_S1_00001 from Panjit International Inc. is functionally equivalent with 6.4A continuous drain current at 30V, exceeding the AO6403's 6A rating. The part number similarity (PJS6403 vs. AO6403) reflects equivalent electrical specifications. However, the package is SOT-23-6 rather than 6-TSOP, requiring PCB layout modifications. Active product status and full regulatory compliance support its use as a substitute.

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