CPH3456-TL-H N-Channel MOSFET 20V 3.5A Equivalent & Substitute Parts

Part Overview

The CPH3456-TL-H is an N-Channel Metal Oxide Semiconductor Field Effect Transistor (MOSFET) manufactured by onsemi, rated for 20V drain-to-source voltage with 3.5A continuous drain current at 25°C. The device is housed in a 3-CPH surface mount package (TO-236-3/SC-59/SOT-23-3) and dissipates a maximum of 1W at ambient temperature.

This part carries an Obsolete product status. Locating equivalent or substitute components becomes necessary when original inventory is depleted or when design flexibility is required for procurement optimization. Substitute parts must maintain electrical compatibility across critical parameters including voltage rating, current capacity, on-resistance characteristics, and thermal performance while accommodating the same or compatible package footprints.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Technology	MOSFET (Metal Oxide)	—
Drain to Source Voltage (Vdss)	20	V
Current - Continuous Drain (Id) @ 25°C	3.5	A (Ta)
Rds On (Max) @ Id, Vgs	71	mOhm @ 1.5A, 4.5V
Gate Charge (Qg) (Max) @ Vgs	2.8	nC @ 4.5V
Vgs (Max)	±12	V
Input Capacitance (Ciss) (Max) @ Vds	260	pF @ 10V
Power Dissipation (Max)	1	W (Ta)
Operating Temperature (TJ)	150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the CPH3456-TL-H is determined by strict alignment across the following critical parameters:

Voltage Rating: All substitute parts must maintain a Drain to Source Voltage (Vdss) rating of 20V or greater to ensure safe operation within the original design envelope.

Current Capacity: Continuous drain current (Id) at 25°C must equal or exceed 3.5A to support the same load conditions. Parts with lower current ratings are not suitable.

On-Resistance (Rds On): The maximum on-resistance must not significantly exceed the original specification of 71mOhm at rated conditions. Lower on-resistance values are acceptable and provide improved efficiency.

Package Compatibility: All substitute parts must use surface mount packages compatible with TO-236-3, SC-59, or SOT-23-3 footprints to ensure direct board-level compatibility.

Thermal Performance: Power dissipation capability must support the 1W maximum rating at ambient temperature.

Gate Charge and Input Capacitance: These parameters influence switching speed and driver requirements. Substitutes with comparable or lower values maintain circuit performance.

Moisture Sensitivity: MSL rating of 1 (Unlimited) is required to match the original part's handling and storage requirements.

The three substitute parts listed below satisfy these criteria with varying degrees of parameter alignment and product status.

Parameter Comparison

Parameter	CPH3456-TL-H	CPH3456-TL-W	PMV65UNER	ZXMN2B14FHTA
Manufacturer	onsemi	onsemi	Nexperia USA Inc.	Diodes Incorporated
Product Status	Obsolete	Obsolete	Active	Active
FET Type	N-Channel	N-Channel	N-Channel	N-Channel
Vdss (V)	20	20	20	20
Id @ 25°C (A)	3.5	3.5	2.8	3.5
Rds On (Max) (mOhm)	71 @ 1.5A, 4.5V	71 @ 1.5A, 4.5V	73 @ 2.8A, 4.5V	55 @ 3.5A, 4.5V
Gate Charge (Qg) (nC)	2.8 @ 4.5V	2.8 @ 4.5V	6 @ 10V	11 @ 4.5V
Vgs (Max) (V)	±12	±12	±8	±8
Ciss (Max) (pF)	260 @ 10V	260 @ 10V	291 @ 10V	872 @ 10V
Power Dissipation (Max) (W)	1	1	0.49	1
Operating Temperature (°C)	150	150	-55 to 150	-55 to 150
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

CPH3456-TL-W (onsemi): This part provides the closest electrical match to the CPH3456-TL-H, with identical voltage rating, current capacity, on-resistance, and gate charge specifications. Both devices are rated for 150°C maximum junction temperature and share the same 3-CPH package footprint. The CPH3456-TL-W carries Obsolete product status, matching the original part. However, it includes ROHS3 compliance certification, providing regulatory advantage. Inventory availability is significantly higher at 32,300 pieces compared to 720 pieces for the original part. This substitute is suitable for direct replacement in existing designs without circuit modification.

PMV65UNER (Nexperia USA Inc.): This part maintains the 20V voltage rating and compatible package footprint but operates at a reduced continuous drain current of 2.8A, which is 0.7A below the original specification. The on-resistance of 73mOhm is marginally higher than the original 71mOhm. Power dissipation is limited to 490mW, significantly lower than the 1W rating of the original part. The PMV65UNER carries Active product status and includes ROHS3 compliance. This substitute is suitable only for applications where the actual operating current does not exceed 2.8A and thermal dissipation remains below 490mW. Extended operating temperature range (-55°C to 150°C) provides advantage in temperature-sensitive applications. Inventory availability is high at 48,300 pieces.

ZXMN2B14FHTA (Diodes Incorporated): This part matches the original voltage rating and current capacity of 3.5A with superior on-resistance performance of 55mOhm at rated conditions, representing a 23% improvement over the original 71mOhm specification. The device maintains 1W power dissipation capability and is housed in a compatible SOT-23-3 package. The ZXMN2B14FHTA carries Active product status with ROHS3 compliance. Gate charge is elevated at 11nC compared to 2.8nC for the original part, and input capacitance is significantly higher at 872pF versus 260pF, which may require driver circuit evaluation in high-frequency switching applications. Extended operating temperature range (-55°C to 150°C) is provided. Inventory availability is limited at 2,038 pieces. This substitute is suitable for applications prioritizing low on-resistance and thermal efficiency.

Frequently Asked Questions (FAQ)

Q: Can the CPH3456-TL-W be used as a direct replacement for the CPH3456-TL-H?

A: Yes. The CPH3456-TL-W provides identical electrical specifications across all critical parameters including voltage rating, current capacity, on-resistance, and gate charge. Both parts use the same 3-CPH package footprint and share identical thermal ratings. No circuit modification is required.

Q: Is the PMV65UNER suitable for all applications using the CPH3456-TL-H?

A: No. The PMV65UNER is rated for 2.8A continuous drain current, which is 0.7A lower than the original 3.5A specification. Additionally, power dissipation is limited to 490mW compared to 1W for the original part. This substitute is suitable only for applications where actual operating current does not exceed 2.8A and thermal dissipation remains below 490mW. Applications requiring the full 3.5A capacity must use alternative substitutes.

Q: What is the impact of higher gate charge in the ZXMN2B14FHTA?

A: The ZXMN2B14FHTA exhibits gate charge of 11nC at 4.5V compared to 2.8nC for the original part. Higher gate charge increases the energy required to switch the device and may increase switching losses in high-frequency applications. Driver circuits must be evaluated to confirm adequate gate drive capability. In low-frequency or DC switching applications, this parameter has minimal impact.

Q: Are all substitute parts RoHS3 compliant?

A: The CPH3456-TL-W, PMV65UNER, and ZXMN2B14FHTA are all certified ROHS3 compliant. The original CPH3456-TL-H does not specify RoHS status. All substitute parts carry REACH Unaffected status, matching the original part.

Q: What is the difference in input capacitance between the substitute parts?

A: Input capacitance (Ciss) varies significantly among the substitutes. The CPH3456-TL-W and original part both specify 260pF at 10V. The PMV65UNER specifies 291pF, representing a 12% increase. The ZXMN2B14FHTA specifies 872pF, representing a 235% increase. Higher input capacitance increases gate drive current requirements and may affect switching speed. Applications with marginal gate driver capability should prioritize substitutes with lower input capacitance values.

Q: Can the ZXMN2B14FHTA be used in high-frequency switching applications?

A: The ZXMN2B14FHTA can be used in high-frequency applications, but gate charge and input capacitance must be evaluated. The elevated gate charge of 11nC and input capacitance of 872pF require higher gate drive current compared to the original part. Driver circuit analysis is necessary to confirm adequate switching speed and efficiency. The superior on-resistance of 55mOhm provides thermal advantage in high-frequency operation.

Q: What is the moisture sensitivity level for all parts?

A: All parts, including the original CPH3456-TL-H and all three substitutes, carry MSL rating of 1 (Unlimited). This indicates no moisture sensitivity restrictions and allows standard handling and storage procedures without special precautions.

Q: Which substitute part offers the best thermal performance?

A: The ZXMN2B14FHTA offers the best thermal performance due to its lowest on-resistance of 55mOhm at rated conditions, compared to 71mOhm for the original part and CPH3456-TL-W, and 73mOhm for the PMV65UNER. Lower on-resistance reduces resistive heating and improves overall thermal efficiency. However, the PMV65UNER is limited to 490mW power dissipation, which may restrict its use in high-current applications.

Q: Are there inventory considerations for selecting a substitute?

A: Yes. The CPH3456-TL-H has 720 pieces in stock. The CPH3456-TL-W offers significantly higher availability at 32,300 pieces, making it the preferred choice for volume procurement. The PMV65UNER provides 48,300 pieces, the highest availability. The ZXMN2B14FHTA has limited availability at 2,038 pieces. Procurement strategy should consider both electrical suitability and inventory availability.

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