MCH6437-TL-E N-Channel MOSFET 20V 7A Equivalent & Substitute Parts

Part Overview

The MCH6437-TL-E is an N-Channel MOSFET manufactured by onsemi, rated for 20V drain-to-source voltage with 7A continuous drain current at 25°C. The device is housed in a 6-MCPH surface mount package and dissipates a maximum of 1.5W. This part is classified as obsolete, making identification of equivalent and substitute components necessary for ongoing design support, legacy system maintenance, and production continuity.

Key Parameters

Parameter	Value	Unit
Manufacturer Part Number	MCH6437-TL-E	—
Manufacturer	onsemi	—
FET Type	N-Channel	—
Technology	MOSFET (Metal Oxide)	—
Drain to Source Voltage (Vdss)	20	V
Current - Continuous Drain (Id) @ 25°C	7	A (Ta)
Rds On (Max) @ Id, Vgs	24	mOhm @ 4A, 4.5V
Gate Charge (Qg) (Max) @ Vgs	8.4	nC @ 4.5 V
Vgs (Max)	±12	V
Input Capacitance (Ciss) (Max) @ Vds	660	pF @ 10 V
Power Dissipation (Max)	1.5	W (Ta)
Operating Temperature (TJ)	150	°C
Mounting Type	Surface Mount	—
Package / Case	6-SMD, Flat Leads	—
Product Status	Obsolete	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MCH6437-TL-E is determined by the following critical parameters:

Electrical Compatibility Requirements:

Drain to Source Voltage (Vdss) must equal or exceed 20V
Continuous drain current (Id) must meet or exceed 7A at 25°C
On-resistance (Rds On) must not significantly exceed 24mOhm to maintain thermal performance
Gate charge (Qg) and input capacitance (Ciss) affect switching characteristics and circuit performance
Maximum gate voltage (Vgs Max) must accommodate circuit drive requirements

Mechanical and Environmental Compatibility:

Surface mount packaging required
Operating temperature range must support 150°C junction temperature
RoHS3 compliance and MSL Level 1 required for regulatory and handling consistency

Substitution Categories:

Direct Equivalent (Package Variant): MCH6437-TL-W shares identical electrical specifications but uses SC-88FL/MCPH6 packaging instead of 6-MCPH.
Manufacturer-Recommended Substitute: SSM6K403TU,LF (Toshiba) meets voltage and thermal requirements but with reduced current rating (4.2A) and lower power dissipation (500mW).
Similar Substitutes: RUL035N02TR (Rohm) and STT5N2VH5 (STMicroelectronics) provide 20V operation with reduced current ratings (3.5A and 5A respectively) and alternative packaging.

Parameter Comparison

Parameter	MCH6437-TL-E (Main)	MCH6437-TL-W (Direct Equivalent)	SSM6K403TU,LF (Recommended)	RUL035N02TR (Similar)	STT5N2VH5 (Similar)
Manufacturer	onsemi	onsemi	Toshiba	Rohm	STMicroelectronics
Vdss (V)	20	20	20	20	20
Id @ 25°C (A)	7	7	4.2	3.5	5
Rds On (Max) (mOhm)	24 @ 4A, 4.5V	24 @ 4A, 4.5V	28 @ 3A, 4V	43 @ 3.5A, 4.5V	30 @ 2A, 4.5V
Qg (Max) (nC)	8.4 @ 4.5V	8.4 @ 4.5V	16.8 @ 4V	5.7 @ 4.5V	4.6 @ 4.5V
Ciss (Max) (pF)	660 @ 10V	660 @ 10V	1050 @ 10V	460 @ 10V	367 @ 16V
Vgs (Max) (V)	±12	±12	±10	±10	±8
Power Dissipation (Max) (W)	1.5	1.5	0.5	0.32	1.6
Operating Temperature (°C)	150	150	150	150	-55 to 150
Package / Case	6-SMD, Flat Leads	6-TSSOP, SC-88, SOT-363	6-SMD, Flat Leads	6-SMD, Flat Leads	SOT-23-6
Product Status	Obsolete	Obsolete	Active	Active	Not For New Designs
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

MCH6437-TL-W (Direct Equivalent): This part is the direct electrical equivalent of the MCH6437-TL-E with identical performance specifications. The only difference is the package variant (SC-88FL/MCPH6 versus 6-MCPH). Selection of this part is appropriate when PCB layout can accommodate the alternative package footprint. Both parts share obsolete status and identical compliance certifications (ROHS3, MSL Level 1).

SSM6K403TU,LF (Manufacturer-Recommended Substitute): This Toshiba part is classified as active and carries ROHS3 compliance. It maintains the 20V voltage rating and provides adequate thermal performance (500mW). However, the continuous drain current is reduced to 4.2A, which is 60% of the original specification. This part is suitable for applications where the full 7A current is not required. The higher gate charge (16.8nC) and input capacitance (1050pF) may affect switching speed in high-frequency applications.

RUL035N02TR (Similar Substitute): This Rohm part is active and ROHS3 compliant. It provides 20V operation with 3.5A continuous drain current (50% of original). The on-resistance is higher at 43mOhm, resulting in increased power dissipation. This part is suitable only for low-current applications. The lower gate charge (5.7nC) and input capacitance (460pF) provide faster switching characteristics.

STT5N2VH5 (Similar Substitute): This STMicroelectronics part is classified as "Not For New Designs" but remains available. It provides 20V operation with 5A continuous drain current (71% of original) and 1.6W power dissipation. The extended operating temperature range (-55°C to 150°C) provides additional thermal margin. The lower gate voltage maximum (±8V) may require circuit adjustment. This part is suitable for legacy system support only.

Frequently Asked Questions (FAQ)

Q: Can MCH6437-TL-W be used as a direct replacement for MCH6437-TL-E?

A: Yes. MCH6437-TL-W is electrically identical to MCH6437-TL-E with the same Vdss (20V), Id (7A), Rds On (24mOhm), and power dissipation (1.5W). The difference is packaging: MCH6437-TL-W uses SC-88FL/MCPH6 while MCH6437-TL-E uses 6-MCPH. PCB layout compatibility must be verified before substitution.

Q: Why is SSM6K403TU,LF rated for only 4.2A when the original is 7A?

A: SSM6K403TU,LF is a different device from a different manufacturer (Toshiba versus onsemi). While it maintains the 20V voltage rating and RoHS3 compliance, it is designed for lower current applications. Substitution is valid only if circuit current requirements do not exceed 4.2A.

Q: Can RUL035N02TR replace MCH6437-TL-E in high-current applications?

A: No. RUL035N02TR is rated for 3.5A continuous drain current, which is 50% of the MCH6437-TL-E specification. Additionally, its on-resistance (43mOhm) is significantly higher, resulting in greater power dissipation. This part is suitable only for applications requiring 3.5A or less.

Q: What is the impact of different gate charge values on circuit performance?

A: Gate charge (Qg) affects switching speed and driver requirements. MCH6437-TL-E has 8.4nC at 4.5V. SSM6K403TU,LF has 16.8nC, requiring longer switching times and potentially higher driver current. RUL035N02TR has 5.7nC, enabling faster switching. Circuit design must account for these differences in gate drive timing.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (MCH6437-TL-W, SSM6K403TU,LF, RUL035N02TR, and STT5N2VH5) are ROHS3 compliant with MSL Level 1 rating, matching the original part's environmental and regulatory status.

Q: Why is STT5N2VH5 marked "Not For New Designs"?

A: STT5N2VH5 is classified as "Not For New Designs" by STMicroelectronics, indicating it is in end-of-life status. This part remains available for legacy system support but should not be selected for new product development. For new designs, SSM6K403TU,LF (active status) is the preferred alternative.

Q: What is the significance of different package types among substitutes?

A: MCH6437-TL-E uses 6-SMD flat leads. MCH6437-TL-W uses SC-88FL/MCPH6 (6-TSSOP). SSM6K403TU,LF uses 6-SMD flat leads (compatible footprint). RUL035N02TR uses 6-SMD flat leads (compatible footprint). STT5N2VH5 uses SOT-23-6 (different footprint). Package compatibility must be verified against PCB design before substitution.

Q: Can input capacitance differences affect circuit operation?

A: Yes. MCH6437-TL-E has 660pF input capacitance. SSM6K403TU,LF has 1050pF (higher), which increases gate drive current requirements and may slow switching. RUL035N02TR has 460pF (lower), enabling faster switching with lower drive current. STT5N2VH5 has 367pF (lowest). Circuit design must account for these capacitance variations in high-frequency applications.

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