FDMS2504SDC N-Channel MOSFET 25V 42A/49A Equivalent & Substitute Parts

Part Overview

The FDMS2504SDC is an N-Channel MOSFET manufactured by onsemi, rated for 25V drain-to-source voltage with continuous drain current of 42A at Ta and 49A at Tc. The device is housed in an 8-PQFN (5x6) surface mount package and features onsemi's Dual Cool™, PowerTrench®, and SyncFET™ technologies. This part is classified as obsolete, making identification of equivalent and substitute components necessary for ongoing design support, production continuity, and system maintenance. Substitute parts must maintain electrical compatibility across critical parameters including voltage rating, current handling capability, on-resistance characteristics, and thermal performance while accommodating package and pinout variations.

Substiute Parts

FDMS2504SDC

onsemiIn Stock: 1407FDMS2504SDC Datasheet

Current PartRFQ

CSD16401Q5

Texas InstrumentsIn Stock: 19852CSD16401Q5 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FDMS2504SDC is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Electrical Compatibility Requirements:

• Drain-to-source voltage rating (Vdss) must equal or exceed 25V
• Continuous drain current capability must support the application's current demands at both Ta and Tc conditions
• On-resistance (Rds On) characteristics must be compatible with the thermal and efficiency requirements of the circuit
• Gate charge and input capacitance must be within acceptable ranges to maintain switching performance and drive circuit compatibility
• Operating temperature range must encompass -55°C to 150°C (TJ)

Mechanical Compatibility Requirements:

• Surface mount technology with compatible pinout and footprint
• Package form factor must be physically compatible with the 8-PQFN (5x6) footprint or equivalent 8-pin power package
• Moisture sensitivity level of 1 (Unlimited) or equivalent

Regulatory and Compliance Requirements:

• REACH Unaffected status
• EAR99 classification
• HTSUS code 8541.29.0095

The CSD16401Q5 from Texas Instruments meets these substitution criteria through equivalent voltage rating, compatible current handling, similar on-resistance performance, and identical package footprint dimensions.

Parameter Comparison

Engineering Selection Recommendations

CSD16401Q5 as Primary Substitute:

The CSD16401Q5 from Texas Instruments is the designated substitute for the obsolete FDMS2504SDC. This substitution is supported by the following engineering factors:

Product Status Alignment: The CSD16401Q5 maintains active product status with Texas Instruments, ensuring ongoing availability, technical support, and manufacturing continuity. This addresses the primary limitation of the FDMS2504SDC, which is classified as obsolete.

Electrical Parameter Compatibility: Both devices share identical 25V drain-to-source voltage ratings, ensuring compatibility with existing circuit voltage specifications. The CSD16401Q5 delivers 38A continuous drain current at Ta, which is slightly lower than the FDMS2504SDC's 42A rating. However, the CSD16401Q5 provides 100A continuous drain current at Tc, substantially exceeding the FDMS2504SDC's 49A Tc rating. This enhanced thermal performance provides improved headroom for thermal management in applications requiring sustained high-current operation.

On-resistance characteristics are comparable, with the CSD16401Q5 rated at 1.6 mOhm (versus 1.25 mOhm for the FDMS2504SDC), representing a 28% increase. This difference is within acceptable engineering tolerance for most switching applications and is offset by the superior thermal performance at Tc.

Regulatory and Compliance Alignment: Both devices maintain REACH Unaffected status, EAR99 classification, and identical HTSUS coding (8541.29.0095), ensuring regulatory continuity and trade compliance.

Package and Thermal Considerations: The CSD16401Q5 is supplied in 8-VSON-CLIP (5x6) packaging, which shares identical footprint dimensions with the FDMS2504SDC's 8-PQFN (5x6) package. Both devices maintain MSL 1 (Unlimited) moisture sensitivity classification. The VSON-CLIP package variant provides enhanced thermal performance through improved die attachment and heat dissipation characteristics, contributing to the superior Tc current rating.

Operational Temperature Range: Both devices support the full -55°C to 150°C (TJ) operating temperature range, ensuring compatibility across all environmental conditions.

Frequently Asked Questions (FAQ)

Q: Why is the FDMS2504SDC being discontinued?

A: The FDMS2504SDC is classified as obsolete by onsemi. Obsolescence typically results from technology advancement, market consolidation, or manufacturer portfolio optimization. The CSD16401Q5 represents a newer-generation alternative with enhanced thermal performance and active manufacturing status.

Q: Can the CSD16401Q5 directly replace the FDMS2504SDC in existing designs?

A: The CSD16401Q5 is electrically and mechanically compatible with the FDMS2504SDC for most applications. Both devices share identical 25V voltage ratings, comparable on-resistance characteristics, and identical 8-pin (5x6) footprint dimensions. The primary design consideration is the slightly lower Ta current rating (38A versus 42A) and lower gate charge (29 nC versus 119 nC), which may require minor drive circuit adjustments in applications with marginal current or switching speed requirements.

Q: What are the key electrical differences between these devices?

A: The CSD16401Q5 exhibits lower gate charge (29 nC at 4.5V versus 119 nC at 10V) and lower input capacitance (4100 pF at 12.5V versus 7770 pF at 13V), resulting in faster switching characteristics and reduced drive circuit power consumption. The CSD16401Q5 provides superior thermal performance at Tc (100A versus 49A), making it advantageous for high-current thermal applications. On-resistance is slightly higher (1.6 mOhm versus 1.25 mOhm), representing a minor trade-off in conduction losses.

Q: Are the packages physically identical?

A: Both devices utilize 8-pin surface mount packages with identical 5x6 mm footprint dimensions. The FDMS2504SDC uses 8-PQFN packaging, while the CSD16401Q5 uses 8-VSON-CLIP packaging. These package variants share the same pinout and PCB footprint, enabling direct physical substitution without layout modifications.

Q: What is the moisture sensitivity level for both devices?

A: Both the FDMS2504SDC and CSD16401Q5 are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. These devices do not require special moisture control during storage, handling, or assembly.

Q: Are there regulatory or compliance differences?

A: Both devices maintain identical regulatory status: REACH Unaffected, EAR99 export classification, and HTSUS code 8541.29.0095. No compliance adjustments are required when substituting the CSD16401Q5 for the FDMS2504SDC.

Q: What is the operating temperature range for both devices?

A: Both devices support continuous operation across -55°C to 150°C junction temperature (TJ), ensuring compatibility across all industrial and commercial temperature specifications.

Q: How does gate charge affect circuit design?

A: The CSD16401Q5's lower gate charge (29 nC) compared to the FDMS2504SDC (119 nC) results in faster switching transitions and reduced drive circuit power dissipation. Applications with high switching frequencies benefit from this characteristic. Drive circuits designed for the FDMS2504SDC's higher gate charge will operate the CSD16401Q5 with improved performance margins.

Q: Which device should be selected for new designs?

A: The CSD16401Q5 is the appropriate choice for new designs due to its active product status, enhanced thermal performance, and superior switching characteristics. The FDMS2504SDC should be used only for legacy system maintenance or design continuity where existing inventory is available.