FDMC3020DC N-Channel 30V 17A/40A MOSFET Equivalent & Substitute Parts

Part Overview

The FDMC3020DC is an N-Channel 30V MOSFET manufactured by onsemi, featuring the Dual Cool™ 33 package technology. This device is rated for 17A continuous drain current at Ta (ambient temperature) and 40A at Tc (case temperature), with maximum power dissipation of 3W at Ta and 50W at Tc. The part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and production continuity. Substitute parts must maintain electrical compatibility across drain-source voltage, continuous drain current, on-resistance characteristics, and thermal performance parameters while accommodating different package form factors.

Substiute Parts

FDMC3020DC

onsemiIn Stock: 8167FDMC3020DC Datasheet

Current PartRFQ

RS1E170GNTB

Rohm SemiconductorIn Stock: 16332RS1E170GNTB Datasheet

DirectRFQ

CSD17552Q3A

Texas InstrumentsIn Stock: 7987CSD17552Q3A Datasheet

SimilarRFQ

CSD17578Q3A

Texas InstrumentsIn Stock: 25292CSD17578Q3A Datasheet

SimilarRFQ

CSD17578Q3AT

Texas InstrumentsIn Stock: 7790CSD17578Q3AT Datasheet

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RQ3E130BNTB

Rohm SemiconductorIn Stock: 15482RQ3E130BNTB Datasheet

SimilarRFQ

STL11N3LLH6

STMicroelectronicsIn Stock: 20680STL11N3LLH6 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FDMC3020DC is determined by strict alignment of electrical and thermal parameters. The primary substitution criteria are:

Critical Matching Parameters:

• Drain to Source Voltage (Vdss): Must equal 30V
• Continuous Drain Current: Must support minimum 17A at Ta or equivalent thermal performance
• On-Resistance (Rds On): Must not exceed 6.25 mOhm at rated conditions to maintain thermal and efficiency characteristics
• Gate Threshold Voltage: Must be compatible with 4.5V to 10V drive voltage range
• Operating Temperature Range: Must support -55°C to 150°C junction temperature
• RoHS3 Compliance and MSL 1 rating required for production compatibility

Substitution Categories:

Direct Substitutes maintain all critical electrical parameters and support equivalent current ratings:

• RS1E170GNTB (Rohm Semiconductor): 17A Ta rating, 6.7 mOhm Rds On, active status

Functional Equivalents provide comparable performance with minor parameter variations acceptable for most applications:

• CSD17578Q3A and CSD17578Q3AT (Texas Instruments): 20A Ta rating, 7.3 mOhm Rds On, enhanced thermal performance
• CSD17552Q3A (Texas Instruments): 15A Ta rating, 6 mOhm Rds On, higher Tc current capability (60A)
• RQ3E130BNTB (Rohm Semiconductor): 13A Ta rating, 6 mOhm Rds On, lower current but acceptable for reduced-load applications
• STL11N3LLH6 (STMicroelectronics): 11A Tc rating, 7.5 mOhm Rds On, lower current capability

All substitute parts are ROHS3 compliant with MSL 1 rating and operate across the required temperature range.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: RS1E170GNTB (Rohm Semiconductor)

The RS1E170GNTB provides the closest electrical match to the FDMC3020DC with identical 17A Ta and 40A Tc current ratings. This part maintains equivalent Rds On performance at 6.7 mOhm and supports the full -55°C to 150°C operating range. The device is active in production with ROHS3 compliance and MSL 1 rating. Package transition from 8-PowerTDFN to 8-HSOP requires PCB layout modification but maintains thermal and electrical performance. Inventory availability is 16,233 units.

Secondary Substitutes for Higher Current Applications: CSD17578Q3A / CSD17578Q3AT (Texas Instruments)

Both CSD17578 variants offer 20A Ta rating with 7.3 mOhm Rds On and enhanced thermal performance (37W Tc). These parts exceed the original 17A specification and provide superior power dissipation capability. Both are active, ROHS3 compliant, and support the full operating temperature range. The 8-VSONP (3x3.3) package differs from the original but provides equivalent thermal characteristics. CSD17578Q3A inventory: 25,200 units; CSD17578Q3AT inventory: 7,738 units.

Alternative for Reduced Current Applications: CSD17552Q3A (Texas Instruments)

The CSD17552Q3A provides 15A Ta rating with superior 6 mOhm Rds On and exceptional Tc performance (60A). This part is suitable for applications where the full 17A Ta is not required but higher case temperature current capability is beneficial. Active status, ROHS3 compliance, and full temperature range support are confirmed. Inventory: 7,900 units.

Lower Current Alternative: RQ3E130BNTB (Rohm Semiconductor)

The RQ3E130BNTB delivers 13A Ta rating with 6 mOhm Rds On in an 8-HSMT package. This part is appropriate for designs where current requirements do not exceed 13A. Active production status, ROHS3 compliance, and MSL 1 rating are confirmed. Inventory: 15,438 units.

Thermal Performance Alternative: STL11N3LLH6 (STMicroelectronics)

The STL11N3LLH6 provides 11A Tc rating with 50W Tc power dissipation matching the original part's thermal capability. This device is suitable for applications prioritizing thermal performance over continuous current. Active status, ROHS3 compliance, and full temperature range support are confirmed. Inventory: 20,581 units.

All substitute parts maintain ROHS3 compliance, MSL 1 rating, and EAR99 export classification consistent with the original FDMC3020DC.

Frequently Asked Questions (FAQ)

Q: Can RS1E170GNTB directly replace FDMC3020DC without circuit modification?

A: RS1E170GNTB maintains identical electrical specifications (17A Ta, 40A Tc, 30V Vdss, 6.7 mOhm Rds On) and supports the same operating temperature range. However, the package changes from 8-PowerTDFN to 8-HSOP, requiring PCB footprint and layout modification. Electrical performance is equivalent; physical placement differs.

Q: What is the primary difference between CSD17578Q3A and CSD17578Q3AT?

A: Both parts are electrically identical with 20A Ta rating, 7.3 mOhm Rds On, and 37W Tc power dissipation. The designation difference reflects manufacturing date codes or tape/reel packaging variations. Both are active, ROHS3 compliant, and suitable for direct substitution in equivalent applications.

Q: Is CSD17552Q3A suitable for applications requiring 17A continuous current?

A: CSD17552Q3A is rated for 15A Ta, which is 2A below the FDMC3020DC specification. This part is suitable only for applications where continuous drain current does not exceed 15A. For designs requiring the full 17A rating, RS1E170GNTB or CSD17578Q3A are appropriate selections.

Q: How does the 8-HSOP package of RS1E170GNTB compare thermally to the original 8-PowerTDFN?

A: RS1E170GNTB specifies 23W Tc power dissipation compared to the original 50W Tc. This indicates reduced thermal performance in the 8-HSOP package. For applications requiring maximum thermal capability, CSD17578Q3A (37W Tc) or STL11N3LLH6 (50W Tc) are preferred alternatives.

Q: Are all substitute parts available in the same packaging options (Cut Tape and Digi-Reel)?

A: All substitute parts are available in Cut Tape (CT) and Digi-Reel® or Tape & Reel (TR) packaging. Specific packaging availability should be confirmed with the component supplier for production requirements.

Q: What is the gate charge difference between FDMC3020DC and substitute parts?

A: FDMC3020DC specifies 23 nC gate charge at 10V. RS1E170GNTB provides 12 nC (lower), CSD17578 variants provide 22.2 nC (equivalent), CSD17552Q3A provides 12 nC (lower), RQ3E130BNTB provides 36 nC (higher), and STL11N3LLH6 provides 17 nC (lower). Lower gate charge reduces driver power requirements; higher gate charge increases driver stress.

Q: Do all substitute parts meet the same compliance standards as FDMC3020DC?

A: All substitute parts are ROHS3 compliant, MSL 1 rated (Unlimited), REACH unaffected, and classified as EAR99 for export purposes, matching the original FDMC3020DC compliance profile.

Q: Which substitute part provides the best on-resistance performance?

A: CSD17552Q3A and RQ3E130BNTB both provide 6 mOhm Rds On, which is superior to the original 6.25 mOhm specification. CSD17578 variants provide 7.3 mOhm, and STL11N3LLH6 provides 7.5 mOhm. Lower on-resistance reduces conduction losses and heat generation.

Q: Is the FDMC3020DC obsolete status a concern for substitute selection?

A: Yes. The obsolete status of FDMC3020DC necessitates substitution for new production and long-term design continuity. All recommended substitute parts are active in production with confirmed inventory availability, ensuring supply chain reliability.