CPH3356-TL-H Equivalent & Substitute Parts

Part Overview

The CPH3356-TL-H is a P-Channel MOSFET manufactured by onsemi, rated for 20V drain-to-source voltage with 2.5A continuous drain current at 25°C. The device is housed in a TO-236-3 (SOT-23-3) surface mount package and dissipates a maximum of 1W at ambient temperature. This part is classified as obsolete, making identification of equivalent and substitute components essential for ongoing design support, production continuity, and system maintenance.

Key Parameters

Parameter	Value	Unit
FET Type	P-Channel	—
Drain to Source Voltage (Vdss)	20	V
Continuous Drain Current (Id) @ 25°C	2.5	A
On-State Resistance (Rds On) @ 1A, 4.5V	137	mOhm
Gate Charge (Qg) @ 4.5V	3.3	nC
Input Capacitance (Ciss) @ 10V	250	pF
Power Dissipation (Max)	1	W
Operating Temperature (TJ)	150	°C
Package Type	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the CPH3356-TL-H is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

FET Type: P-Channel topology
Drain to Source Voltage (Vdss): 20V minimum rating
Continuous Drain Current (Id): Equal to or greater than 2.5A at 25°C
Package Type: TO-236-3 / SOT-23-3 surface mount compatibility
On-State Resistance (Rds On): Performance at specified gate voltage (4.5V)
Gate Charge (Qg): Switching characteristics at 4.5V
Input Capacitance (Ciss): Parasitic capacitance at 10V
Power Dissipation: Thermal handling capability
RoHS Compliance: ROHS3 Compliant status

The identified substitute parts—AO3413 and DMP2225LQ-7—meet or exceed the electrical specifications of the CPH3356-TL-H while maintaining package compatibility and regulatory compliance. Both substitutes are classified as active products, ensuring long-term availability and supply chain stability.

Parameter Comparison

Parameter	CPH3356-TL-H (onsemi)	AO3413 (Alpha & Omega)	DMP2225LQ-7 (Diodes Inc.)	Unit
FET Type	P-Channel	P-Channel	P-Channel	—
Drain to Source Voltage (Vdss)	20	20	20	V
Continuous Drain Current (Id) @ 25°C	2.5	3	2.6	A
On-State Resistance (Rds On) @ 4.5V	137 @ 1A	97 @ 3A	110 @ 2.6A	mOhm
Gate Charge (Qg) @ 4.5V	3.3	6.1	5.3	nC
Input Capacitance (Ciss) @ 10V	250	540	250	pF
Power Dissipation (Max)	1	1.4	1.08	W
Operating Temperature (TJ)	150	−55 to 150	−55 to 150	°C
Package Type	TO-236-3, SOT-23-3	SOT-23-3	TO-236-3, SOT-23-3	—
Mounting Type	Surface Mount	Surface Mount	Surface Mount	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	—
Product Status	Obsolete	Active	Active	—

Engineering Selection Recommendations

AO3413 (Alpha & Omega Semiconductor Inc.)

The AO3413 is an active product offering superior electrical performance relative to the CPH3356-TL-H. It provides 3A continuous drain current (versus 2.5A), reduced on-state resistance of 97 mOhm at 3A and 4.5V, and increased power dissipation capability of 1.4W. The AO3413 maintains identical 20V Vdss rating and SOT-23-3 package compatibility. Extended operating temperature range (−55°C to 150°C) provides broader thermal envelope. ROHS3 compliance and unlimited moisture sensitivity level (MSL 1) ensure regulatory alignment. This substitute is suitable for applications requiring enhanced current handling and thermal performance.

DMP2225LQ-7 (Diodes Incorporated)

The DMP2225LQ-7 is an active automotive-grade product qualified to AEC-Q101 standard. It delivers 2.6A continuous drain current and 110 mOhm on-state resistance at 2.6A and 4.5V, closely matching the CPH3356-TL-H electrical profile. Power dissipation of 1.08W exceeds the original specification. The device maintains 20V Vdss rating and TO-236-3/SOT-23-3 package compatibility. Extended operating temperature range (−55°C to 150°C) and automotive qualification provide enhanced reliability for mission-critical applications. ROHS3 compliance and AEC-Q101 certification establish suitability for automotive and industrial environments.

Both substitutes are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. Selection between AO3413 and DMP2225LQ-7 depends on application-specific requirements: AO3413 for maximum current capacity and thermal headroom; DMP2225LQ-7 for automotive-grade reliability and AEC-Q101 qualification.

Frequently Asked Questions (FAQ)

Q: Can the AO3413 directly replace the CPH3356-TL-H in existing designs?

A: Yes. The AO3413 maintains identical 20V Vdss rating, exceeds the 2.5A current requirement with 3A capability, and uses the same SOT-23-3 package. Pin configuration and polarity are compatible. The reduced on-state resistance (97 mOhm versus 137 mOhm) and increased power dissipation (1.4W versus 1W) provide performance enhancement without design modification.

Q: What is the primary difference between AO3413 and DMP2225LQ-7?

A: The AO3413 offers higher current capacity (3A versus 2.6A) and lower on-state resistance (97 mOhm versus 110 mOhm), making it suitable for high-current applications. The DMP2225LQ-7 carries automotive-grade qualification (AEC-Q101) and is specified for automotive and industrial environments. Both maintain 20V Vdss and SOT-23-3 compatibility.

Q: Are there package compatibility concerns when substituting these parts?

A: No. All three devices—CPH3356-TL-H, AO3413, and DMP2225LQ-7—use TO-236-3 or SOT-23-3 surface mount packages with identical pinout and footprint. Direct PCB substitution is possible without layout modification.

Q: Does the higher gate charge of AO3413 (6.1 nC versus 3.3 nC) affect circuit performance?

A: Gate charge affects switching speed and driver power requirements. The AO3413's higher gate charge (6.1 nC at 4.5V) requires slightly more driver current and extends switching time compared to the CPH3356-TL-H (3.3 nC). This is acceptable in most applications but should be evaluated in high-frequency switching circuits where gate charge directly impacts efficiency.

Q: Is the DMP2225LQ-7 suitable for non-automotive applications?

A: Yes. Although qualified to AEC-Q101 automotive standard, the DMP2225LQ-7 meets all general industrial specifications and regulatory requirements (ROHS3, REACH unaffected). Automotive qualification indicates enhanced reliability and process control, making it suitable for any application requiring high reliability.

Q: What is the significance of the CPH3356-TL-H being classified as obsolete?

A: Obsolete status indicates the part is no longer manufactured by onsemi and existing inventory is limited. The identified substitutes (AO3413 and DMP2225LQ-7) are active products with established supply chains, ensuring long-term availability for production and maintenance applications.

Q: How do the input capacitance values affect circuit design?

A: Input capacitance (Ciss) at 10V is 250 pF for both CPH3356-TL-H and DMP2225LQ-7, but 540 pF for AO3413. Higher capacitance increases gate drive current requirements and may affect high-frequency switching performance. For applications operating below 1 MHz, this difference is typically negligible. High-frequency designs should account for the increased capacitive load when using AO3413.

Q: Are all three parts RoHS compliant?

A: Yes. The CPH3356-TL-H, AO3413, and DMP2225LQ-7 are all ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic components.

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