CPH3455-TL-H N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The CPH3455-TL-H is an N-Channel MOSFET manufactured by onsemi, rated for 35V drain-to-source voltage with 3A continuous drain current at 25°C. This device is designed for surface mount applications in the TO-236-3 (SOT-23-3) package. The part is currently classified as obsolete, necessitating identification of functionally equivalent alternatives from active product lines. Substitute parts must maintain compatibility with the original electrical specifications and mechanical form factor to ensure direct replacement capability in existing circuit designs.

Key Parameters

Parameter	CPH3455-TL-H
Manufacturer	onsemi
FET Type	N-Channel
Technology	MOSFET (Metal Oxide)
Drain to Source Voltage (Vdss)	35 V
Current - Continuous Drain (Id) @ 25°C	3A (Ta)
Rds On (Max) @ Id, Vgs	104mOhm @ 1.5A, 10V
Gate Charge (Qg) (Max) @ Vgs	4 nC @ 10 V
Vgs (Max)	±20V
Input Capacitance (Ciss) (Max) @ Vds	186 pF @ 20 V
Power Dissipation (Max)	1W (Ta)
Operating Temperature (TJ)	150°C
Mounting Type	Surface Mount
Package / Case	TO-236-3, SC-59, SOT-23-3
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the CPH3455-TL-H requires evaluation of the following critical parameters that determine functional equivalence:

Voltage Rating (Vdss): The main part operates at 35V. Substitute parts must have a Vdss rating equal to or greater than 35V to maintain voltage margin and reliability in the original application.

Current Rating (Id @ 25°C): The main part delivers 3A continuous drain current. Substitute parts must support the required current level without exceeding thermal limits in the application.

On-Resistance (Rds On): The main part specifies 104mOhm maximum at 1.5A and 10V gate-source voltage. Substitute parts with comparable or lower on-resistance maintain similar power dissipation characteristics.

Gate Charge (Qg): The main part specifies 4 nC at 10V. Lower gate charge values reduce switching losses and driver requirements.

Input Capacitance (Ciss): The main part specifies 186 pF at 20V. This parameter affects switching speed and driver current requirements.

Package Compatibility: All substitute parts must use the TO-236-3 (SOT-23-3) surface mount package to ensure mechanical and electrical compatibility with existing PCB layouts.

Compliance & Status: All substitute parts must maintain ROHS3 compliance and MSL 1 rating. Active product status ensures long-term availability and supply chain continuity.

Parameter Comparison

Parameter	CPH3455-TL-H (onsemi)	IRLML2030TRPBF (Infineon)	PMV130ENEAR (Nexperia)	XP151A11B0MR-G (Torex)
FET Type	N-Channel	N-Channel	N-Channel	N-Channel
Drain to Source Voltage (Vdss)	35 V	30 V	40 V	30 V
Current - Continuous Drain (Id) @ 25°C	3A (Ta)	2.7A (Ta)	2.1A (Ta)	1A (Ta)
Rds On (Max) @ Id, Vgs	104mOhm @ 1.5A, 10V	100mOhm @ 2.7A, 10V	120mOhm @ 1.5A, 10V	120mOhm @ 500mA, 10V
Gate Charge (Qg) (Max) @ Vgs	4 nC @ 10 V	1 nC @ 4.5 V	3.6 nC @ 10 V	Not Specified
Vgs (Max)	±20V	±20V	±20V	±20V
Input Capacitance (Ciss) (Max) @ Vds	186 pF @ 20 V	110 pF @ 15 V	170 pF @ 20 V	150 pF @ 10 V
Power Dissipation (Max)	1W (Ta)	1.3W (Ta)	460mW (Ta), 5W (Tc)	500mW (Ta)
Operating Temperature (TJ)	150°C	-55°C ~ 150°C	-55°C ~ 150°C	150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-236-3, SOT-23-3	TO-236-3, SOT-23-3	TO-236-3, SOT-23-3	TO-236-3, SOT-23-3
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

IRLML2030TRPBF (Infineon Technologies): This part is classified as active product status with ROHS3 compliance and MSL 1 rating. The IRLML2030TRPBF operates at 30V Vdss, which is below the original 35V specification. Continuous drain current is rated at 2.7A, slightly below the 3A requirement. On-resistance is 100mOhm at 2.7A and 10V, comparable to the main part. Gate charge is significantly lower at 1 nC, reducing switching losses. Input capacitance is 110 pF, lower than the main part. Power dissipation is rated at 1.3W, exceeding the main part specification. This part is suitable for applications where the 30V voltage rating provides adequate margin above the maximum operating voltage.

PMV130ENEAR (Nexperia USA Inc.): This part is classified as active product status with ROHS3 compliance, MSL 1 rating, and automotive qualification (AEC-Q100). The PMV130ENEAR operates at 40V Vdss, exceeding the original 35V specification. Continuous drain current is rated at 2.1A, below the 3A requirement. On-resistance is 120mOhm at 1.5A and 10V. Gate charge is 3.6 nC at 10V, comparable to the main part. Input capacitance is 170 pF at 20V, similar to the main part. Power dissipation is rated at 460mW (Ta) or 5W (Tc), with the higher Tc rating providing thermal flexibility. This part is suitable for applications requiring automotive-grade qualification and higher voltage margin.

XP151A11B0MR-G (Torex Semiconductor Ltd): This part is classified as active product status with ROHS3 compliance and MSL 1 rating. The XP151A11B0MR-G operates at 30V Vdss, below the original 35V specification. Continuous drain current is rated at 1A, significantly below the 3A requirement. On-resistance is 120mOhm at 500mA and 10V. Input capacitance is 150 pF at 10V. Power dissipation is rated at 500mW. This part is suitable only for applications with reduced current requirements below 1A.

Frequently Asked Questions (FAQ)

Q: Can the IRLML2030TRPBF directly replace the CPH3455-TL-H in all applications?

A: The IRLML2030TRPBF has a lower Vdss rating (30V versus 35V) and lower continuous drain current (2.7A versus 3A). Direct replacement is possible only in applications where the maximum operating voltage remains below 30V and the required drain current does not exceed 2.7A. Circuit analysis is required to confirm voltage and current margins.

Q: What is the primary advantage of the PMV130ENEAR substitute?

A: The PMV130ENEAR provides a higher Vdss rating (40V) and automotive-grade qualification (AEC-Q100), making it suitable for applications requiring higher voltage margin and automotive reliability standards. The higher Tc power dissipation rating (5W) provides additional thermal headroom compared to the main part.

Q: Is the XP151A11B0MR-G suitable for high-current applications?

A: No. The XP151A11B0MR-G is rated for only 1A continuous drain current, significantly below the CPH3455-TL-H specification of 3A. This part is suitable only for low-current applications below 1A.

Q: Are all substitute parts compatible with the original PCB layout?

A: Yes. All substitute parts use the TO-236-3 (SOT-23-3) surface mount package, ensuring mechanical and electrical compatibility with existing PCB layouts designed for the CPH3455-TL-H.

Q: What compliance certifications do the substitute parts maintain?

A: All substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, matching the compliance profile of the main part. The PMV130ENEAR additionally carries AEC-Q100 automotive qualification.

Q: How does gate charge affect device selection?

A: Gate charge determines the energy required to switch the MOSFET on and off. Lower gate charge reduces switching losses and driver current requirements. The IRLML2030TRPBF has significantly lower gate charge (1 nC) compared to the main part (4 nC), reducing switching losses in high-frequency applications.

Q: What is the impact of on-resistance differences between substitute parts?

A: On-resistance directly affects power dissipation and heat generation. Lower on-resistance reduces conduction losses. The IRLML2030TRPBF (100mOhm) and PMV130ENEAR (120mOhm) have comparable or slightly higher on-resistance than the main part (104mOhm), resulting in similar thermal performance at equivalent current levels.

Q: Can substitute parts with lower current ratings be used in the original application?

A: No. Using a substitute part with a lower continuous drain current rating than the application requires will result in excessive junction temperature and potential device failure. Current rating must equal or exceed the application requirement.

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