CMS03N06T-HF Equivalent & Substitute Parts

Part Overview

The CMS03N06T-HF is an N-Channel MOSFET manufactured by Comchip Technology, rated for 60V drain-to-source voltage with 3A continuous drain current in a surface mount SOT-23-3 package. This device is classified as obsolete, necessitating identification of equivalent alternatives for ongoing design support and procurement continuity. Substitute parts must maintain electrical compatibility across critical parameters including voltage rating, current capacity, on-resistance characteristics, and thermal performance while accommodating the same package footprint.

Substiute Parts

CMS03N06T-HF

Comchip TechnologyIn Stock: 1076CMS03N06T-HF Datasheet

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G1003A

Goford SemiconductorIn Stock: 41207G1003A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CMS03N06T-HF is determined by the following critical parameters:

Mandatory Compatibility Criteria:

• FET Type: N-Channel topology
• Package: SOT-23-3 (TO-236-3, SC-59) for PCB footprint compatibility
• Mounting Type: Surface Mount
• Operating Temperature Range: -55°C to 150°C (TJ)
• Continuous Drain Current (Id): 3A minimum at 25°C
• Gate-to-Source Voltage (Vgs Max): ±20V maximum rating

Electrical Performance Parameters:

• Drain-to-Source Voltage (Vdss): 60V minimum rating
• On-Resistance (Rds On): Maximum 210 mOhm @ 3A, 10V (allows higher values than original)
• Gate Threshold Voltage (Vgs(th)): Maximum 3V @ 250µA (allows higher values than original)
• Gate Charge (Qg): Maximum 14.6 nC @ 10V (allows higher values than original)

The G1003A meets all mandatory criteria and electrical performance thresholds, establishing it as a valid substitute despite differences in power dissipation rating and product status.

Parameter Comparison

Engineering Selection Recommendations

G1003A as Primary Substitute:

The G1003A is suitable as a substitute for the CMS03N06T-HF based on the following engineering factors:

Electrical Compatibility: The G1003A maintains identical continuous drain current (3A) and gate-to-source voltage rating (±20V). The higher Vdss rating (100V versus 60V) provides enhanced voltage margin and does not compromise circuit operation in 60V applications. The increased on-resistance (210 mOhm versus 105 mOhm) results in higher conduction losses but remains within acceptable operating parameters for most applications. The higher gate threshold voltage (3V versus 2V) requires verification of gate drive voltage adequacy in the target circuit.

Product Status and Availability: The CMS03N06T-HF is classified as obsolete with limited inventory (1052 pieces). The G1003A is active with significantly higher availability (41100 pieces), ensuring long-term procurement viability and supply chain continuity.

Package and Thermal Considerations: Both devices utilize identical SOT-23-3 surface mount packaging, enabling direct PCB footprint compatibility. The G1003A exhibits higher power dissipation capability (5W versus 1.7W), which may require thermal management evaluation in high-current applications.

Compliance and Handling: The G1003A carries MSL 3 (168 hours) moisture sensitivity versus MSL 1 (unlimited) for the original part, requiring adherence to moisture control procedures during storage and assembly. Both devices share identical ECCN and HTSUS classifications.

Frequently Asked Questions (FAQ)

Q: Can the G1003A directly replace the CMS03N06T-HF in existing designs?

A: The G1003A is electrically compatible for applications operating at or below 60V. Direct PCB replacement is possible due to identical SOT-23-3 packaging. However, gate drive voltage adequacy must be verified, as the G1003A has a higher gate threshold voltage (3V maximum versus 2V maximum). Thermal performance should be evaluated if the application operates near the original device's power dissipation limits.

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

A: The primary differences are: (1) Vdss rating—G1003A is rated for 100V versus 60V for the CMS03N06T-HF, providing additional voltage margin; (2) On-resistance—G1003A exhibits 210 mOhm versus 105 mOhm, resulting in approximately 2× higher conduction losses; (3) Power dissipation—G1003A is rated for 5W versus 1.7W, offering greater thermal capacity; (4) Product status—G1003A is active with high availability, while CMS03N06T-HF is obsolete; (5) Moisture sensitivity—G1003A requires MSL 3 handling versus unlimited for the original.

Q: Are there any circuit design considerations when substituting the G1003A?

A: Yes. The higher on-resistance of the G1003A increases conduction losses, which may require thermal analysis in high-current or high-frequency switching applications. The higher gate threshold voltage necessitates verification that the gate drive voltage is sufficient to achieve full on-state conduction. The higher power dissipation rating indicates the device can handle greater thermal loads, but actual thermal performance depends on PCB layout and thermal management design.

Q: What is the impact of the higher Vdss rating on circuit operation?

A: The 100V Vdss rating of the G1003A provides additional voltage safety margin in 60V applications. This does not negatively impact circuit operation; the device will function correctly at voltages up to its rated maximum. The higher voltage rating may result in slightly different parasitic capacitance characteristics, but this is not a limiting factor for direct substitution.

Q: How does the moisture sensitivity level difference affect handling?

A: The CMS03N06T-HF carries MSL 1 (unlimited moisture exposure), while the G1003A carries MSL 3 (168-hour floor life after moisture exposure). The G1003A requires adherence to moisture control procedures during storage, including use of desiccant packaging and controlled humidity environments. Baking procedures may be required if the device exceeds its floor life before assembly.

Q: Is the G1003A suitable for high-frequency switching applications?

A: The G1003A can be used in high-frequency applications. However, the higher gate charge and on-resistance may result in increased switching losses compared to the original CMS03N06T-HF. Circuit performance should be evaluated through simulation or testing to confirm suitability for the specific switching frequency and duty cycle of the target application.