PSMN5R8-30LL,115 N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The PSMN5R8-30LL,115 is an N-Channel MOSFET manufactured by NXP USA Inc., rated for 30V drain-to-source voltage with 40A continuous drain current at Tc. This device is packaged in an 8-DFN3333 (3.3x3.3) surface mount configuration and is designed for high-current switching applications. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing production and design continuity. Substitute parts must maintain compatibility across electrical ratings, thermal characteristics, and mechanical packaging to ensure functional equivalence in circuit applications.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	30	V
Continuous Drain Current (Id) @ 25°C	40	A (Tc)
On-State Resistance (Rds On) @ 10A, 10V	5.8	mOhm
Gate Threshold Voltage (Vgs(th)) @ 1mA	2.15	V
Gate Charge (Qg) @ 10V	24	nC
Input Capacitance (Ciss) @ 15V	1316	pF
Power Dissipation (Max)	55	W (Tc)
Operating Temperature Range	-55 to 150	°C (TJ)
Mounting Type	Surface Mount	—
Package	8-DFN3333 (3.3x3.3)	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the PSMN5R8-30LL,115 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): Must equal 30V
Continuous Drain Current (Id): Must support minimum 40A at Tc
On-State Resistance (Rds On): Must not exceed 5.8mOhm @ specified conditions
Gate Threshold Voltage (Vgs(th)): Must be within ±20V maximum gate voltage specification
Operating Temperature Range: Must support -55°C to 150°C minimum
Mounting Type: Surface Mount required
Package Compatibility: 8-pin DFN or equivalent PowerVDFN packages acceptable

Secondary Compatibility Parameters:

Gate Charge (Qg): Lower values preferred for faster switching
Input Capacitance (Ciss): Lower values reduce gate drive requirements
Power Dissipation: Must support thermal requirements of application
RoHS and REACH Compliance: ROHS3 Compliant and REACH Unaffected required

Substitute parts are grouped by their ability to meet or exceed these parameters while maintaining functional equivalence in high-current switching applications.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ Tc (A)	Rds On (mOhm)	Vgs(th) (V)	Qg (nC)	Ciss (pF)	Power Diss (W)	Package	Status
PSMN5R8-30LL,115	NXP USA Inc.	30	40	5.8	2.15	24	1316	55	8-DFN3333	Obsolete
AON7400A	Alpha & Omega Semiconductor Inc.	30	40	7.5	2.5	24	1380	25	8-DFN-EP (3x3)	Not For New Designs
CSD17552Q3A	Texas Instruments	30	60	6	1.9	12	2050	2.6	8-VSONP (3x3.3)	Active
CSD17578Q3A	Texas Instruments	30	20	7.3	1.9	22.2	1590	37	8-VSONP (3x3.3)	Active
CSD17578Q3AT	Texas Instruments	30	20	7.3	1.9	22.2	1590	37	8-VSONP (3x3.3)	Active
DMT3006LFV-13	Diodes Incorporated	30	60	7	3	8.4	1155	2	PowerDI3333-8	Active
IRFH3702TRPBF	Infineon Technologies	30	42	7.1	2.35	14	1510	2.8	8-PQFN (3x3)	Not For New Designs
NTTFS4C08NTAG	onsemi	30	9.3	5.9	2.2	18.2	1113	25.5	8-WDFN (3.3x3.3)	Active
NTTFS4C50NTAG	onsemi	30	19.4	—	—	—	—	—	8-WDFN (3.3x3.3)	Last Time Buy
NTTFS4C50NTWG	onsemi	30	19.4	—	—	—	—	—	8-WDFN (3.3x3.3)	Active
PSMN4R4-30MLC,115	Nexperia USA Inc.	30	70	4.65	2.15	23	1515	69	LFPAK33	Active

Engineering Selection Recommendations

Primary Recommendation: CSD17552Q3A (Texas Instruments)

The CSD17552Q3A is the preferred substitute for the PSMN5R8-30LL,115. This device meets all critical electrical parameters with a 30V Vdss rating and 60A continuous drain current capability at Tc, exceeding the original 40A requirement. The on-state resistance of 6mOhm is comparable to the original specification. The part is currently in Active product status, ensuring long-term availability and supply chain stability. It carries ROHS3 compliance and MSL 1 rating, matching the original part's environmental certifications. The 8-VSONP (3x3.3) package provides mechanical compatibility with standard surface mount assembly processes.

Secondary Recommendation: DMT3006LFV-13 (Diodes Incorporated)

The DMT3006LFV-13 offers superior current handling at 60A continuous drain current with a 30V Vdss rating. The on-state resistance of 7mOhm is within acceptable tolerance of the original specification. This part is in Active status and provides ROHS3 compliance. The PowerDI3333-8 package is mechanically compatible with the original 8-DFN3333 footprint, minimizing PCB redesign requirements. Lower gate charge (8.4nC) reduces gate drive power consumption compared to the original part.

Alternative Recommendation: PSMN4R4-30MLC,115 (Nexperia USA Inc.)

The PSMN4R4-30MLC,115 provides the lowest on-state resistance at 4.65mOhm, superior to the original 5.8mOhm specification. With 70A continuous drain current capability and 30V Vdss rating, this part significantly exceeds the original performance envelope. Active product status and ROHS3 compliance ensure regulatory compliance. The LFPAK33 package differs mechanically from the original 8-DFN3333, requiring PCB layout modification. This option is suitable for applications requiring enhanced thermal performance and lower conduction losses.

Not Recommended for New Designs:

AON7400A and IRFH3702TRPBF are marked as "Not For New Designs" and should not be selected for new product development. NTTFS4C50NTAG is in "Last Time Buy" status, indicating end-of-life phase-out.

Frequently Asked Questions (FAQ)

Q1: Can the CSD17578Q3A or CSD17578Q3AT substitute for the PSMN5R8-30LL,115?

No. While these parts share the same 30V Vdss rating and Active product status, the continuous drain current rating of 20A at Ta is insufficient for applications requiring the original 40A capability. These parts are suitable only for lower-current applications.

Q2: What is the significance of the different package types (8-DFN3333 vs. 8-VSONP vs. PowerDI3333)?

All three package types are 8-pin surface mount configurations with similar thermal performance characteristics. The primary difference is the physical footprint and pin layout. The 8-DFN3333 and PowerDI3333-8 packages have nearly identical dimensions (3.3x3.3mm), allowing direct PCB footprint compatibility. The 8-VSONP (3x3.3) package has slightly different dimensions and requires PCB layout verification before substitution.

Q3: Why do some substitute parts show lower power dissipation ratings than the original?

Power dissipation ratings are typically specified at ambient temperature (Ta) or case temperature (Tc) under specific test conditions. Lower ratings do not indicate inferior performance; they reflect different measurement methodologies or thermal management approaches. The CSD17552Q3A, for example, shows 2.6W at Ta but delivers superior current handling due to lower on-state resistance.

Q4: Is the NTTFS4C08NTAG a suitable substitute?

No. The NTTFS4C08NTAG has a continuous drain current rating of only 9.3A at Ta, which is significantly below the required 40A specification. This part is suitable only for low-current applications and does not meet the electrical requirements of the original design.

Q5: What does "ROHS3 Compliant" and "REACH Unaffected" mean for substitution?

ROHS3 Compliant indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. REACH Unaffected means the part is not subject to REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) restrictions. All recommended substitutes maintain these certifications, ensuring regulatory compliance in regulated markets.

Q6: Can I use NTTFS4C50NTAG or NTTFS4C50NTWG as substitutes?

These parts have incomplete electrical specifications in the provided data (Rds On, Vgs(th), and power dissipation are not specified). The continuous drain current of 19.4A is below the required 40A minimum. Additionally, NTTFS4C50NTAG is in "Last Time Buy" status. These parts are not recommended for substitution.

Q7: How do I verify package compatibility before PCB redesign?

Compare the physical dimensions and pin configurations of the original 8-DFN3333 (3.3x3.3mm) with the substitute package. The DMT3006LFV-13 (PowerDI3333-8) and PSMN5R8-30LL,115 share identical 3.3x3.3mm dimensions and are directly compatible. The CSD17552Q3A (8-VSONP 3x3.3) requires verification of pin pitch and pad layout before PCB implementation.

Q8: What is the difference between Ta and Tc current ratings?

Ta (ambient temperature) ratings assume operation at 25°C ambient with natural convection cooling. Tc (case temperature) ratings assume operation at 25°C case temperature with enhanced thermal management. The 40A Tc rating of the original part is equivalent to approximately 15A Ta under standard conditions. Substitute parts with higher Tc ratings provide greater thermal headroom in high-power applications.

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