MCH3476-TL-H Equivalent & Substitute Parts

Part Overview

The MCH3476-TL-H is an N-Channel MOSFET manufactured by onsemi, rated for 20V drain-to-source voltage with 2A continuous drain current at 25°C. This device is packaged in SC-70FL/MCPH3 surface mount configuration and is designed for general-purpose switching applications requiring compact form factors.

The MCH3476-TL-H carries an Obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this component.

Substiute Parts

MCH3476-TL-H

onsemiIn Stock: 8992MCH3476-TL-H Datasheet

Current PartRFQ

PMF63UNEX

Nexperia USA Inc.In Stock: 131146PMF63UNEX Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MCH3476-TL-H are identified based on the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• FET Type: N-Channel topology
• Drain to Source Voltage (Vdss): 20V minimum rating
• Continuous Drain Current (Id): 2A or greater at 25°C
• Gate Charge (Qg): Low gate charge for switching efficiency
• On-Resistance (Rds On): Performance at specified gate voltage conditions
• Power Dissipation: Thermal capability sufficient for application requirements

Mechanical Compatibility Criteria:

• Mounting Type: Surface Mount
• Package Classification: Small outline packages (SC-70, SOT-323, or equivalent)
• Pin Configuration: Compatible with existing PCB layouts

The PMF63UNEX from Nexperia USA Inc. qualifies as a substitute based on matching electrical specifications (20V Vdss, 2.2A Id capability, compatible gate charge characteristics) and surface mount packaging in SOT-323 format. The substitute maintains ROHS3 compliance and MSL Level 1 rating, ensuring regulatory and environmental compatibility.

Parameter Comparison

Engineering Selection Recommendations

PMF63UNEX as Primary Substitute:

The PMF63UNEX is suitable for applications requiring MCH3476-TL-H replacement based on the following factors:

1. Electrical Equivalence: Both devices share identical 20V Vdss rating and support 2A+ continuous drain current. Gate drive voltage requirements (1.8V, 4.5V) are identical, ensuring compatibility with existing gate driver circuits.

2. Product Status Advantage: The PMF63UNEX carries Active product status, providing long-term supply chain availability and manufacturing support. The MCH3476-TL-H Obsolete status necessitates transition to an actively manufactured alternative.

3. Regulatory Compliance: Both parts maintain ROHS3 compliance and MSL Level 1 rating, satisfying environmental and moisture handling requirements without additional qualification.

4. Package Consideration: The PMF63UNEX uses SOT-323 packaging, a standard surface mount format. PCB layout modifications are required due to package geometry differences between SC-70FL/MCPH3 and SOT-323. Pin-to-pin functionality remains compatible.

5. Performance Characteristics: The PMF63UNEX demonstrates improved on-resistance (65 mOhm @ 2A, 4.5V versus 125 mOhm @ 1A, 4.5V), resulting in lower power dissipation and reduced thermal load in switching applications.

Design Considerations:

• Gate charge specification differs (1.8 nC versus 5.85 nC), affecting switching speed and gate driver current requirements. Applications with tight switching frequency constraints require evaluation.
• Maximum gate voltage rating differs (±12V versus ±8V). Designs operating at ±12V gate voltage require gate voltage limiting to ±8V maximum.
• Power dissipation rating is lower (395 mW versus 800 mW). Thermal analysis is required for high-duty-cycle applications.

Frequently Asked Questions (FAQ)

Q: Can PMF63UNEX directly replace MCH3476-TL-H without PCB modifications?

A: Electrical functionality is compatible. However, package geometry differs between SC-70FL/MCPH3 and SOT-323. PCB footprint modifications are required. Pin assignments are functionally equivalent (Gate, Drain, Source).

Q: What is the primary reason for substitution?

A: The MCH3476-TL-H is Obsolete. The PMF63UNEX is an Active product from Nexperia, ensuring continued availability and manufacturing support.

Q: Are there compliance or certification differences?

A: Both parts are ROHS3 compliant and carry MSL Level 1 rating. No additional compliance qualification is required for substitution.

Q: How do gate charge differences affect circuit performance?

A: The PMF63UNEX has higher gate charge (5.85 nC versus 1.8 nC). Gate driver circuits must supply adequate current to charge the gate within required switching time windows. Slower switching transitions may result if gate driver current is insufficient.

Q: Is the lower power dissipation rating of PMF63UNEX a limitation?

A: The 395 mW rating of PMF63UNEX is lower than the 800 mW rating of MCH3476-TL-H. Applications operating at high duty cycles or elevated ambient temperatures require thermal analysis to confirm the substitute remains within safe operating limits.

Q: What gate voltage limits apply to PMF63UNEX?

A: Maximum gate voltage is ±8V for PMF63UNEX, compared to ±12V for MCH3476-TL-H. Gate drive circuits must limit voltage to ±8V maximum to prevent gate oxide damage.

Q: Are there temperature operating range differences?

A: PMF63UNEX specifies -55°C to 150°C junction temperature range, providing extended low-temperature operation compared to MCH3476-TL-H (150°C maximum). Both support identical maximum junction temperature.

Q: What packaging considerations apply to PCB redesign?

A: SOT-323 (PMF63UNEX) and SC-70FL/MCPH3 (MCH3476-TL-H) are both 3-lead surface mount packages but differ in physical dimensions and lead spacing. Footprint redesign and reflow profile validation are required.