RSQ035P03TR P-Channel MOSFET 30V 3.5A Equivalent & Substitute Parts

Part Overview

The RSQ035P03TR is a P-Channel MOSFET manufactured by Rohm Semiconductor, rated for 30V drain-to-source voltage and 3.5A continuous drain current at 25°C. The device is housed in a TSMT6 (SC-95) surface mount package and is compliant with ROHS3 standards. This part is currently in active production status with substantial inventory availability (62,300 pieces).

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when alternative packaging or thermal characteristics better suit specific application requirements, or when design optimization requires components with improved electrical performance within the same functional category.

Key Parameters

Parameter	Value	Unit
FET Type	P-Channel	—
Drain to Source Voltage (Vdss)	30	V
Continuous Drain Current (Id) @ 25°C	3.5	A
Rds On (Max) @ 3.5A, 10V	65	mOhm
Power Dissipation (Max)	1.25	W
Gate Threshold Voltage (Vgs(th)) @ 1mA	2.5	V
Operating Temperature (TJ)	150	°C
Mounting Type	Surface Mount	—
Package	SOT-23-6 Thin (TSMT6)	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the RSQ035P03TR is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

FET Type: P-Channel (mandatory)
Drain to Source Voltage (Vdss): 30V minimum (equal or greater)
Continuous Drain Current (Id): 3.5A minimum at 25°C
Rds On (Max): 65mOhm or lower at rated current and gate voltage
Power Dissipation: 1.25W or greater
Gate Threshold Voltage (Vgs(th)): Compatible with 2.5V maximum specification
Operating Temperature: 150°C or higher junction temperature
Mounting Type: Surface Mount
Package Compatibility: SOT-23-6 Thin or equivalent footprint

Secondary Considerations:

RoHS3 compliance and REACH status alignment
Moisture Sensitivity Level (MSL) rating
Availability and inventory status

Parts are grouped into three categories based on substitution suitability: direct equivalents (identical electrical specifications and package), functional equivalents (meet or exceed all electrical parameters with compatible packaging), and performance-enhanced alternatives (superior electrical characteristics within the same voltage and current class).

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On Max (mOhm)	Power Diss. (W)	Vgs(th) Max (V)	Package	Status
RSQ035P03TR	Rohm Semiconductor	30	3.5	65	1.25	2.5	SOT-23-6 Thin	Active
RQ6E035ATTCR	Rohm Semiconductor	30	3.5	50	1.25	2.5	SOT-23-6 Thin	Active
RQ6E035SPTR	Rohm Semiconductor	30	3.5	65	0.95	2.5	SOT-23-6 Thin	Active
AO6405	Alpha & Omega Semiconductor	30	5	52	2	3	6-TSOP	Not For New Designs
BSL211SPH6327XTSA1	Infineon Technologies	20	4.7	67	2	1.2	SOT-23-6 Thin	Active
DMP3056LDM-7	Diodes Incorporated	30	4.3	45	1.25	2.1	SOT-23-6	Active
DMP3098LDM-7	Diodes Incorporated	30	4	65	1.25	2.1	SOT-23-6	Active
DMP3130L-7	Diodes Incorporated	30	3.5	77	0.7	1.3	SOT-23-3	Not For New Designs
FDC610PZ	onsemi	30	4.9	42	1.6	3	SOT-23-6 Thin	Active
FDC654P	Fairchild Semiconductor	30	3.6	75	1.6	3	SOT-23-6 Thin	Active
FDC658AP	onsemi	30	4	50	1.6	3	SOT-23-6 Thin	Active

Engineering Selection Recommendations

Direct Equivalents (Rohm Semiconductor Family):

RQ6E035ATTCR and RQ6E035SPTR are direct Rohm Semiconductor equivalents with identical voltage and current ratings. RQ6E035ATTCR offers improved Rds On performance (50mOhm versus 65mOhm) while maintaining the same 1.25W power dissipation rating. RQ6E035SPTR maintains identical electrical specifications to the RSQ035P03TR but with reduced power dissipation (950mW). Both parts are in active production status and maintain ROHS3 compliance. These parts are recommended for applications requiring guaranteed compatibility with existing designs.

Performance-Enhanced Alternatives (30V Class):

DMP3056LDM-7 (Diodes Incorporated) and FDC610PZ (onsemi) provide superior Rds On characteristics (45mOhm and 42mOhm respectively) at higher current ratings (4.3A and 4.9A). Both maintain 30V Vdss rating and are housed in compatible SOT-23-6 Thin packages. FDC658AP (onsemi) offers 50mOhm Rds On at 4A with 1.6W power dissipation. These alternatives are suitable for applications where reduced on-resistance and improved thermal performance provide design benefits. All three parts are in active production status with ROHS3 compliance.

Functional Equivalents with Package Variations:

DMP3098LDM-7 (Diodes Incorporated) matches the RSQ035P03TR electrical specifications exactly (30V, 3.5A equivalent performance, 65mOhm Rds On) with identical 1.25W power dissipation. This part is available in Tape & Reel packaging and is in active production status.

Parts Not Recommended for New Designs:

AO6405 (Alpha & Omega Semiconductor) and DMP3130L-7 (Diodes Incorporated) carry "Not For New Designs" status. AO6405 features higher current capability (5A) but uses a different package (6-TSOP). DMP3130L-7 uses a SOT-23-3 package incompatible with the RSQ035P03TR footprint and has reduced power dissipation (700mW). These parts should be avoided in new circuit designs.

Voltage-Reduced Alternative:

BSL211SPH6327XTSA1 (Infineon Technologies OptiMOS™ series) operates at 20V Vdss with higher current capability (4.7A) and improved Rds On (67mOhm). This part is suitable only for applications where 20V maximum voltage is acceptable and where the higher current rating provides design margin. The lower gate threshold voltage (1.2V) and reduced maximum gate voltage (±12V) require circuit verification.

Frequently Asked Questions (FAQ)

Q: Can RQ6E035ATTCR directly replace RSQ035P03TR in existing designs?

A: Yes. RQ6E035ATTCR is a direct Rohm Semiconductor equivalent with identical 30V/3.5A ratings, same SOT-23-6 Thin package, and improved Rds On performance (50mOhm versus 65mOhm). No circuit modifications are required. The part is in active production status with ROHS3 compliance.

Q: What is the primary difference between RQ6E035SPTR and RSQ035P03TR?

A: Both parts share identical electrical specifications (30V, 3.5A, 65mOhm Rds On, 2.5V Vgs(th)). The primary difference is power dissipation rating: RQ6E035SPTR is rated at 950mW versus 1.25W for RSQ035P03TR. This makes RQ6E035SPTR suitable for thermally constrained applications. Both use the same SOT-23-6 Thin package.

Q: Why is AO6405 marked "Not For New Designs"?

A: AO6405 carries obsolescence status from Alpha & Omega Semiconductor. While the part meets electrical requirements (30V, 5A capability), its production status restricts use in new circuit designs. Active alternatives with superior performance characteristics are available from multiple manufacturers.

Q: Can FDC610PZ be used as a drop-in replacement?

A: FDC610PZ is functionally compatible with superior performance characteristics (42mOhm Rds On, 4.9A capability, 1.6W power dissipation). The part uses the same SOT-23-6 Thin package and is in active production status. However, the higher gate threshold voltage (3V versus 2.5V) requires verification that gate drive circuits provide adequate voltage margin. No PCB layout changes are required.

Q: What are the package compatibility considerations?

A: RSQ035P03TR uses SOT-23-6 Thin (TSMT6) package. Direct replacements must use identical or footprint-compatible packages. DMP3056LDM-7, DMP3098LDM-7, FDC610PZ, FDC654P, and FDC658AP all use SOT-23-6 Thin or equivalent packages. DMP3130L-7 uses SOT-23-3 package (3-pin) and is not footprint compatible. BSL211SPH6327XTSA1 uses PG-TSOP6-6 package, which may require PCB layout verification despite similar pin count.

Q: Which substitute offers the best thermal performance?

A: FDC610PZ and FDC658AP both offer 1.6W power dissipation rating (versus 1.25W for RSQ035P03TR), providing improved thermal headroom. FDC610PZ additionally provides the lowest Rds On (42mOhm) among all alternatives, resulting in reduced I²R losses and lower junction temperature rise under load.

Q: Are all substitute parts RoHS3 compliant?

A: All recommended active-status parts (RQ6E035ATTCR, RQ6E035SPTR, DMP3056LDM-7, DMP3098LDM-7, FDC610PZ, FDC654P, FDC658AP, and BSL211SPH6327XTSA1) are ROHS3 compliant. Parts marked "Not For New Designs" (AO6405, DMP3130L-7) also carry ROHS3 compliance but should not be selected for new circuit designs.

Q: What is the significance of gate threshold voltage differences?

A: Gate threshold voltage (Vgs(th)) determines the minimum gate-source voltage required to turn the MOSFET on. RSQ035P03TR specifies 2.5V maximum. Substitutes with higher Vgs(th) (such as AO6405, FDC610PZ, FDC654P at 3V, or BSL211SPH6327XTSA1 at 1.2V) require circuit verification to ensure gate drive voltage provides adequate margin above threshold. Lower Vgs(th) values (BSL211SPH6327XTSA1) may enable lower gate drive voltage but require verification of minimum drive voltage capability.

Q: Can BSL211SPH6327XTSA1 be used in 30V applications?

A: No. BSL211SPH6327XTSA1 is rated for maximum 20V Vdss. Using this part in 30V applications will result in device failure. This part is suitable only for applications where the maximum supply voltage does not exceed 20V.

Q: What inventory considerations apply to substitute selection?

A: RSQ035P03TR has the highest inventory availability (62,300 pieces). Among active alternatives, FDC610PZ (56,300 pieces) and DMP3056LDM-7 (50,300 pieces) offer substantial stock. RQ6E035SPTR (3,381 pieces) and BSL211SPH6327XTSA1 (8,367 pieces) have more limited availability. Inventory status should be verified at time of procurement.

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