MCH3475-TL-E Equivalent & Substitute Parts

Part Overview

The MCH3475-TL-E is an N-Channel MOSFET manufactured by onsemi, rated for 30V drain-to-source voltage with 1.8A continuous drain current at 25°C. The device is housed in a SC-70FL/MCPH3 surface mount package and dissipates up to 800mW. This part is classified as obsolete, making identification of equivalent and substitute components necessary for ongoing design support, production continuity, and system maintenance.

Substiute Parts

MCH3475-TL-E

onsemiIn Stock: 1529MCH3475-TL-E Datasheet

Current PartRFQ

PMF250XNEX

Nexperia USA Inc.In Stock: 116202PMF250XNEX Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MCH3475-TL-E is determined by the following critical electrical and mechanical parameters:

Voltage Rating Compatibility: The substitute part must maintain a Drain to Source Voltage (Vdss) rating of 30V or greater to ensure safe operation across the original design envelope.

Current Handling Capability: The substitute must support the continuous drain current requirement. The MCH3475-TL-E specifies 1.8A at 25°C; substitute parts with lower current ratings require circuit-level design review to confirm thermal and operational margins.

On-State Resistance (Rds On): The MCH3475-TL-E exhibits 180mOhm maximum at 900mA and 10V gate voltage. Substitute parts with higher Rds On values increase power dissipation and heat generation, affecting thermal performance.

Power Dissipation: The 800mW maximum power dissipation rating establishes thermal limits. Substitute parts with lower power dissipation ratings may require thermal management adjustments.

Gate Charge and Input Capacitance: These parameters affect switching speed and driver circuit requirements. Significant deviations may necessitate gate driver circuit modifications.

Package and Mounting: The SC-70FL/MCPH3 package is a 3-lead surface mount configuration. Substitute parts in different packages (such as SOT-323) require PCB layout and assembly process changes.

Product Status and Compliance: Active substitute parts with current manufacturing status and ROHS3 compliance provide supply chain continuity and regulatory alignment.

Parameter Comparison

Engineering Selection Recommendations

PMF250XNEX as Substitute for MCH3475-TL-E

The PMF250XNEX from Nexperia USA Inc. is an active product suitable for substitution in applications where the MCH3475-TL-E is no longer available. Both devices share identical 30V Vdss ratings and N-Channel MOSFET topology, establishing baseline voltage compatibility.

Current Rating Consideration: The PMF250XNEX provides 1.0A continuous drain current, which is lower than the MCH3475-TL-E specification of 1.8A. Substitution is appropriate only in circuits where the actual operating current does not exceed 1.0A at 25°C. Applications requiring the full 1.8A capability require alternative component selection or circuit redesign.

On-State Resistance and Power Dissipation: The PMF250XNEX exhibits 254mOhm Rds On at 900mA and 4.5V gate voltage, compared to 180mOhm for the MCH3475-TL-E at 10V. The higher on-state resistance increases conduction losses. The PMF250XNEX maximum power dissipation is 342mW, significantly lower than the MCH3475-TL-E at 800mW. Thermal analysis is required to confirm acceptable junction temperature rise in the target application.

Gate Drive Voltage: The PMF250XNEX specifies a maximum gate voltage of ±12V, compared to ±20V for the MCH3475-TL-E. Existing gate driver circuits must operate within the ±12V limit to ensure device reliability.

Package Compatibility: The PMF250XNEX uses SOT-323 packaging, while the MCH3475-TL-E uses SC-70FL/MCPH3. Although both are 3-lead surface mount packages, PCB footprint and assembly process modifications are required.

Compliance and Supply Chain: The PMF250XNEX is an active product with ROHS3 compliance, REACH unaffected status, and established supply chain availability (116,109 pieces in stock). The MCH3475-TL-E is obsolete, making the PMF250XNEX a viable long-term alternative for new designs and production continuity.

Frequently Asked Questions (FAQ)

Q: Can the PMF250XNEX directly replace the MCH3475-TL-E in existing designs?

A: Direct replacement requires verification of three factors: (1) operating drain current does not exceed 1.0A at 25°C, (2) gate driver circuit operates within ±12V limits, and (3) PCB layout accommodates SOT-323 package dimensions. If all conditions are met, substitution is feasible. If operating current exceeds 1.0A or gate voltage exceeds ±12V, alternative components must be evaluated.

Q: What is the impact of higher Rds On in the PMF250XNEX?

A: The PMF250XNEX exhibits 254mOhm Rds On at 900mA and 4.5V, compared to 180mOhm for the MCH3475-TL-E at 10V. At equivalent current levels, the higher on-state resistance increases power dissipation and heat generation. Thermal modeling of the specific application is necessary to confirm acceptable junction temperature rise and device reliability.

Q: Are there package compatibility issues between SC-70FL/MCPH3 and SOT-323?

A: Both packages are 3-lead surface mount configurations, but physical dimensions and PCB footprints differ. SOT-323 is a smaller package than SC-70FL/MCPH3. PCB layout redesign, including footprint modification and trace routing adjustments, is required for substitution. Assembly process parameters may also require adjustment.

Q: What is the significance of the lower power dissipation rating in the PMF250XNEX?

A: The PMF250XNEX maximum power dissipation is 342mW, compared to 800mW for the MCH3475-TL-E. This lower rating reflects the device's thermal design limits. In applications where the MCH3475-TL-E dissipates power approaching 800mW, the PMF250XNEX may reach thermal limits at lower power levels. Thermal analysis and potentially enhanced heat dissipation measures (such as thermal vias or heat sinking) may be necessary.

Q: How do gate charge differences affect circuit performance?

A: The MCH3475-TL-E specifies 2nC gate charge at 10V, while the PMF250XNEX specifies 1.65nC at 4.5V. Lower gate charge reduces the charge transfer required during switching, potentially improving switching speed and reducing gate driver power consumption. However, the gate charge is measured at different gate voltages, making direct comparison complex. Gate driver circuit performance should be validated in the target application.

Q: Is the PMF250XNEX suitable for high-temperature applications?

A: The PMF250XNEX specifies an operating temperature range of −55°C to 150°C junction temperature. The MCH3475-TL-E specifies a maximum operating temperature of 150°C. Both devices support equivalent maximum temperature operation. The PMF250XNEX additionally specifies a lower temperature limit of −55°C, providing extended low-temperature capability if required by the application.

Q: What compliance certifications apply to both devices?

A: Both the MCH3475-TL-E and PMF250XNEX are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 and HTSUS 8541.21.0095. Both devices have Moisture Sensitivity Level 1 (unlimited shelf life). Regulatory and environmental compliance requirements are equivalent between the two parts.