CPH3350-TL-W P-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The CPH3350-TL-W is a P-Channel MOSFET manufactured by onsemi, rated for 20V drain-to-source voltage with 3A 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 equivalent) and dissipates 1W maximum power. This part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within the specified electrical and mechanical parameters.

Key Parameters

Parameter	CPH3350-TL-W	Unit
FET Type	P-Channel	—
Drain-to-Source Voltage (Vdss)	20	V
Continuous Drain Current (Id) @ 25°C	3	A
On-Resistance (Rds On) @ 1.5A, 4.5V	83	mOhm
Gate Charge (Qg) @ 4.5V	4.6	nC
Input Capacitance (Ciss) @ 10V	375	pF
Power Dissipation (Max)	1	W
Operating Temperature (TJ)	150	°C
Package Type	SOT-23-3	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the CPH3350-TL-W is determined by the following critical parameters:

Primary Substitution Criteria:

FET Type: P-Channel (required)
Drain-to-Source Voltage (Vdss): 20V minimum (required)
Continuous Drain Current (Id): 3A or greater (required for direct replacement)
Package Type: SOT-23-3 surface mount (required for mechanical compatibility)
Technology: MOSFET Metal Oxide (required)

Secondary Compatibility Parameters:

On-Resistance (Rds On): Lower or equivalent values preferred
Gate Charge (Qg): Lower values reduce switching losses
Input Capacitance (Ciss): Lower values improve switching performance
Power Dissipation: 1W or greater capability
Operating Temperature: Minimum 150°C junction temperature
RoHS3 Compliance and MSL 1 rating

Substitute parts are grouped into two categories:

Category A – Direct Equivalents (3A or greater drain current): Parts meeting or exceeding the 3A continuous drain current specification with 20V Vdss rating in SOT-23-3 package.

Category B – Functional Alternatives (2A to 2.7A drain current): Parts with reduced drain current ratings but compatible electrical and mechanical parameters, suitable for applications with lower current demands.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Qg (nC)	Ciss (pF)	Power (W)	Tj Max (°C)	Package	Status
CPH3350-TL-W	onsemi	20	3	83 @ 1.5A, 4.5V	4.6 @ 4.5V	375 @ 10V	1	150	SOT-23-3	Obsolete
FDN304PZ	onsemi	20	2.4	52 @ 2.4A, 4.5V	20 @ 4.5V	1310 @ 10V	0.5	150	SOT-23-3	Active
FDN342P	onsemi	20	2	80 @ 2A, 4.5V	9 @ 4.5V	635 @ 10V	0.5	150	SOT-23-3	Active
AO3413	Alpha & Omega Semiconductor	20	3	97 @ 3A, 4.5V	6.1 @ 4.5V	540 @ 10V	1.4	150	SOT-23-3	Active
AO3419	Alpha & Omega Semiconductor	20	3.5	85 @ 3.5A, 10V	4.4 @ 4.5V	400 @ 10V	1.4	150	SOT-23-3	Active
AO3423	Alpha & Omega Semiconductor	20	2	92 @ 2A, 10V	6.6 @ 4.5V	620 @ 10V	1.4	150	SOT-23-3	Active
DMG2301U-7	Diodes Incorporated	20	2.5	130 @ 2.8A, 4.5V	6.5 @ 4.5V	608 @ 6V	0.8	150	SOT-23-3	Active
DMG3413L-7	Diodes Incorporated	20	3	95 @ 3A, 4.5V	9 @ 4.5V	857 @ 10V	0.7	150	SOT-23-3	Active
DMP2130L-7	Diodes Incorporated	20	3	75 @ 3.5A, 4.5V	7.3 @ 4.5V	443 @ 16V	1.4	150	SOT-23-3	Active
DMP2160U-7	Diodes Incorporated	20	3.2	80 @ 1.5A, 4.5V	—	627 @ 10V	1.4	150	SOT-23-3	Active
DMP2215L-7	Diodes Incorporated	20	2.7	100 @ 2.7A, 4.5V	5.3 @ 4.5V	250 @ 10V	1.08	150	SOT-23-3	Active

Engineering Selection Recommendations

Category A – Direct Equivalents (Recommended Primary Substitutes)

The following parts provide equivalent or superior electrical performance with 3A or greater drain current ratings:

AO3413 (Alpha & Omega Semiconductor) – Exact current rating match (3A) with 1.4W power dissipation. Active product status with ROHS3 compliance and MSL 1 rating. On-resistance of 97 mOhm at 3A, 4.5V is within acceptable tolerance of the original 83 mOhm specification.

AO3419 (Alpha & Omega Semiconductor) – Exceeds current specification at 3.5A with superior gate charge (4.4 nC) and input capacitance (400 pF). Active product with full compliance certifications. Recommended for applications requiring enhanced performance margin.

DMG3413L-7 (Diodes Incorporated) – Matches 3A current rating with 95 mOhm on-resistance. Active product with ROHS3 compliance. Lower power dissipation (0.7W) compared to original specification.

DMP2130L-7 (Diodes Incorporated) – Provides 3A current rating with superior on-resistance (75 mOhm at 3.5A, 4.5V). Active product with 1.4W power dissipation and full compliance certifications.

DMP2160U-7 (Diodes Incorporated) – Exceeds current specification at 3.2A with matching on-resistance (80 mOhm at 1.5A, 4.5V). Active product with 1.4W power dissipation and full compliance certifications.

Category B – Functional Alternatives (Reduced Current Applications)

The following parts are suitable for applications where drain current requirements are 2.7A or lower:

FDN304PZ (onsemi) – 2.4A rating with superior on-resistance (52 mOhm). PowerTrench® series technology. Active product with ROHS3 compliance. Lower power dissipation (0.5W) suitable for efficiency-critical applications.

FDN342P (onsemi) – 2A rating with 80 mOhm on-resistance. PowerTrench® series technology. Active product with full compliance certifications. Suitable for lower-current switching applications.

AO3423 (Alpha & Omega Semiconductor) – 2A rating with 1.4W power dissipation. Active product with extensive inventory availability (999,100 pcs). ROHS3 compliant with MSL 1 rating.

DMG2301U-7 (Diodes Incorporated) – 2.5A rating with 0.8W power dissipation. Active product with ROHS3 compliance. Higher on-resistance (130 mOhm) requires thermal evaluation in current-limited designs.

DMP2215L-7 (Diodes Incorporated) – 2.7A rating with lowest input capacitance (250 pF) among substitutes. Active product with 1.08W power dissipation and full compliance certifications.

Selection Basis:

All recommended substitutes maintain P-Channel MOSFET topology with 20V Vdss rating in SOT-23-3 surface mount package. All parts are active products with ROHS3 compliance and MSL 1 moisture sensitivity rating, ensuring long-term availability and manufacturing consistency. Operating temperature range of 150°C junction temperature matches the original specification. Selection between Category A and Category B depends on application current requirements and thermal design constraints.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with lower drain current rating than the original CPH3350-TL-W?

A: Yes, if your application current requirement is lower than 3A. Category B alternatives (2A to 2.7A ratings) are electrically compatible and mechanically interchangeable in SOT-23-3 package. Verify that your circuit's maximum drain current does not exceed the substitute part's continuous current rating at 25°C.

Q: What is the significance of on-resistance (Rds On) when selecting a substitute?

A: On-resistance determines power dissipation and voltage drop across the MOSFET during conduction. Lower Rds On values reduce heat generation and improve efficiency. The CPH3350-TL-W specifies 83 mOhm at 1.5A, 4.5V. Substitute parts with comparable or lower Rds On values (such as FDN304PZ at 52 mOhm or DMP2130L-7 at 75 mOhm) provide equivalent or superior thermal performance.

Q: Are all substitute parts pin-compatible with the CPH3350-TL-W?

A: Yes. All listed substitutes use the SOT-23-3 package (TO-236-3/SC-59 equivalent), which maintains identical pin configuration and footprint. Direct PCB replacement is possible without layout modification.

Q: What does "Active" product status mean compared to "Obsolete"?

A: Active products are currently manufactured and supported by the supplier with guaranteed long-term availability. Obsolete products are no longer manufactured and existing inventory is limited. All recommended substitutes are active products, ensuring reliable sourcing for current and future production.

Q: How do gate charge (Qg) and input capacitance (Ciss) affect circuit performance?

A: Gate charge determines the energy required to switch the MOSFET on and off, affecting switching speed and driver power consumption. Input capacitance affects high-frequency performance and switching losses. Lower values improve switching efficiency. The CPH3350-TL-W specifies 4.6 nC gate charge and 375 pF input capacitance. Substitutes with lower values (such as AO3419 at 4.4 nC and 400 pF) provide improved switching characteristics.

Q: What is the importance of RoHS3 compliance and MSL 1 rating?

A: RoHS3 compliance ensures the part meets European Union restrictions on hazardous substances, required for many markets and applications. MSL 1 (Moisture Sensitivity Level 1) indicates unlimited shelf life without moisture-control packaging, simplifying inventory management and reducing handling costs. All recommended substitutes meet both certifications.

Q: Can I substitute a part with higher power dissipation rating?

A: Yes. Higher power dissipation ratings provide additional thermal margin and do not negatively affect circuit operation. For example, AO3413 and AO3419 both specify 1.4W power dissipation compared to the original 1W, offering improved thermal headroom without functional changes.

Q: Which substitute offers the best overall performance match to the CPH3350-TL-W?

A: AO3413 provides the closest electrical match with identical 3A drain current rating, comparable on-resistance (97 mOhm vs. 83 mOhm), and matching 150°C junction temperature. DMP2160U-7 offers superior on-resistance (80 mOhm) with higher current rating (3.2A), providing enhanced performance margin. Selection depends on specific application requirements for current capacity and thermal design.

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