CPH3448-TL-H N-Channel 30V 4A MOSFET Equivalent & Substitute Parts

Part Overview

The CPH3448-TL-H is an N-Channel 30V 4A MOSFET manufactured by onsemi in a 3-CPH surface mount package. This device is classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and ongoing production support. The part operates at a maximum junction temperature of 150°C with a power dissipation rating of 1W and is suitable for general-purpose switching applications requiring moderate current handling in compact form factors.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Drain to Source Voltage (Vdss)	30	V
Continuous Drain Current (Id) @ 25°C	4	A
On-State Resistance (Rds On) @ 2A, 4.5V	50	mOhm
Gate Charge (Qg) @ 4.5V	4.7	nC
Input Capacitance (Ciss) @ 10V	430	pF
Power Dissipation (Max)	1	W
Operating Temperature (TJ)	150	°C
Package Type	3-CPH / SOT-23-3	—
Mounting Type	Surface Mount	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the CPH3448-TL-H is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

Drain to Source Voltage (Vdss): Must equal 30V
Continuous Drain Current (Id): Must equal or exceed 4A at 25°C
Package Type: Must be compatible with 3-CPH / SOT-23-3 form factor
Mounting Type: Surface mount configuration required
Technology: N-Channel MOSFET (Metal Oxide)

Secondary Compatibility Parameters:

On-State Resistance (Rds On): Lower or equivalent values preferred
Gate Charge (Qg): Lower values reduce switching losses
Input Capacitance (Ciss): Lower values improve switching speed
Power Dissipation: Must support 1W or greater thermal capability
Operating Temperature: Must support minimum 150°C junction temperature

Substitute parts are grouped into two categories: Direct Equivalents (matching all primary criteria with active product status) and Functional Alternatives (meeting electrical requirements with different product status or compliance certifications).

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
CPH3448-TL-H	onsemi	30	4	50 @ 2A, 4.5V	4.7 @ 4.5V	430 @ 10V	1	150	3-CPH	Obsolete
RTR040N03TL	Rohm	30	4	48 @ 4A, 4.5V	8.3 @ 4.5V	475 @ 10V	1	150	TSMT3	Active
AO3402	Alpha & Omega	30	4	55 @ 4A, 10V	4.34 @ 4.5V	390 @ 15V	1.4	150	SOT-23-3	Not For New Designs
AO3406	Alpha & Omega	30	3.6	50 @ 3.6A, 10V	5 @ 10V	210 @ 15V	1.4	150	SOT-23-3	Not For New Designs
AO3418	Alpha & Omega	30	3.8	60 @ 3.8A, 10V	3.2 @ 4.5V	270 @ 15V	1.4	150	SOT-23-3	Not For New Designs
AO3424	Alpha & Omega	30	3.8	80 @ 2A, 10V	3.2 @ 4.5V	270 @ 15V	1.4	150	SOT-23-3	Not For New Designs
IRLML6346TRPBF	Infineon	30	3.4	63 @ 3.4A, 4.5V	2.9 @ 4.5V	270 @ 24V	1.3	150	SOT-23-3	Active
PMV40UN2R	Nexperia	30	3.7	44 @ 3.7A, 4.5V	12 @ 4.5V	635 @ 15V	0.49	150	TO-236AB	Active
PMV45EN2R	Nexperia	30	4.1	42 @ 4.1A, 10V	6.3 @ 10V	209 @ 15V	0.51	150	TO-236AB	Active
FDN359AN	onsemi	30	2.7	46 @ 2.7A, 10V	7 @ 5V	480 @ 10V	0.5	150	SOT-23-3	Active
ZXMN3F30FHTA	Diodes Inc.	30	3.8	47 @ 3.2A, 10V	7.7 @ 10V	318 @ 15V	0.95	150	SOT-23-3	Active

Engineering Selection Recommendations

Recommended Primary Substitutes (Active Status, Full Compliance):

RTR040N03TL (Rohm Semiconductor) — Preferred direct equivalent. Matches CPH3448-TL-H in Vdss (30V), Id (4A), and power dissipation (1W). Active product status with RoHS3 compliance. TSMT3 package provides compatible surface mount form factor. On-state resistance of 48mOhm @ 4A, 4.5V is superior to the original specification.
PMV45EN2R (Nexperia USA Inc.) — Exceeds current rating at 4.1A with 30V Vdss. Active product status with RoHS3 compliance. TO-236AB package is mechanically compatible with SOT-23-3 footprints. Superior on-state resistance of 42mOhm @ 4.1A, 10V. Power dissipation of 510mW (Ta) is adequate for 1W applications with thermal management.

Secondary Substitutes (Functional Compatibility, Alternative Status):

AO3402 (Alpha & Omega Semiconductor Inc.) — Matches 4A continuous drain current and 30V Vdss. Power dissipation of 1.4W exceeds original specification. Product status is "Not For New Designs," limiting use to legacy system support. RoHS3 compliant. SOT-23-3 package is directly compatible.
IRLML6346TRPBF (Infineon Technologies) — Active product with HEXFET® series designation. Provides 3.4A continuous current at 30V Vdss. Lower gate charge (2.9nC) and reduced input capacitance (270pF) improve switching performance. Power dissipation of 1.3W supports thermal requirements. Suitable for applications where current margin below 4A is acceptable.

Lower Current Alternatives (Current Derating Required):

FDN359AN (onsemi) — Active product with PowerTrench® series technology. Provides 2.7A continuous current at 30V Vdss. Reduced power dissipation (500mW) requires thermal derating for 1W applications. Superior on-state resistance of 46mOhm @ 2.7A, 10V. Suitable only for applications with current requirements below 2.7A.
ZXMN3F30FHTA (Diodes Incorporated) — Active product providing 3.8A continuous current at 30V Vdss. Power dissipation of 950mW approaches original specification. On-state resistance of 47mOhm @ 3.2A, 10V is competitive. Suitable for applications with current requirements between 3.5A and 3.8A.

Selection Criteria by Application:

Direct Replacement (No Design Changes): RTR040N03TL or PMV45EN2R
Legacy System Support: AO3402 or AO3406
Optimized Switching Performance: IRLML6346TRPBF
Current-Limited Applications (≤2.7A): FDN359AN
Current-Limited Applications (3.5–3.8A): ZXMN3F30FHTA or AO3418

All recommended substitutes maintain 30V Vdss, surface mount configuration, SOT-23-3 or compatible packaging, and 150°C maximum junction temperature alignment with the original CPH3448-TL-H specification.

Frequently Asked Questions (FAQ)

Q: Can RTR040N03TL replace CPH3448-TL-H in existing PCB designs without layout modifications?

A: RTR040N03TL uses a TSMT3 package while CPH3448-TL-H uses 3-CPH. Both are SOT-23-3 variants with identical pin configurations and footprint dimensions (TO-236-3, SC-59). PCB layouts designed for SOT-23-3 footprints accept RTR040N03TL without modification. Verify footprint compatibility with your design documentation.

Q: What is the primary reason CPH3448-TL-H is obsolete?

A: CPH3448-TL-H is classified as obsolete by onsemi. Active alternatives from multiple manufacturers (Rohm, Nexperia, Infineon, Diodes, Alpha & Omega) provide equivalent or superior electrical performance in compatible packages, making continued production of the original part unnecessary.

Q: Does PMV45EN2R provide better performance than the original CPH3448-TL-H?

A: PMV45EN2R exceeds the original specification in continuous drain current (4.1A vs. 4A) and provides superior on-state resistance (42mOhm vs. 50mOhm). Power dissipation is lower (510mW vs. 1W), requiring thermal management verification for high-power applications. Gate charge and input capacitance are reduced, improving switching speed.

Q: Are all substitute parts RoHS3 compliant?

A: All recommended substitute parts carry RoHS3 compliance certification. The original CPH3448-TL-H does not specify RoHS status. Verify RoHS compliance requirements for your application before final part selection.

Q: Can I use AO3406 as a direct replacement if my application only requires 3.6A?

A: AO3406 provides 3.6A continuous current at 30V Vdss, meeting reduced current requirements. However, product status is "Not For New Designs," limiting use to legacy system support only. For new designs, select from active-status alternatives such as RTR040N03TL or PMV45EN2R.

Q: What is the difference between Rds On specifications at different gate voltages?

A: On-state resistance (Rds On) decreases as gate-source voltage (Vgs) increases. CPH3448-TL-H specifies 50mOhm @ 2A, 4.5V. Substitute parts often specify Rds On at higher Vgs values (10V), resulting in lower resistance values. Compare specifications at identical Vgs and Id conditions for accurate performance assessment.

Q: Is IRLML6346TRPBF suitable for applications requiring 4A continuous current?

A: IRLML6346TRPBF provides 3.4A continuous current at 25°C, which is below the 4A requirement of CPH3448-TL-H. Use IRLML6346TRPBF only in applications with maximum continuous current requirements of 3.4A or lower. For 4A applications, select RTR040N03TL or PMV45EN2R.

Q: What thermal considerations apply when substituting with lower power-rated devices?

A: PMV40UN2R and FDN359AN have power dissipation ratings below 1W. Applications dissipating 1W require thermal management (heatsinking, PCB copper area) to maintain junction temperature within 150°C limits. Calculate thermal resistance (θJA) and verify adequate cooling for your specific application environment.

Q: Are gate charge differences significant for switching applications?

A: Gate charge (Qg) affects switching speed and driver power consumption. CPH3448-TL-H specifies 4.7nC @ 4.5V. IRLML6346TRPBF provides 2.9nC (lower, faster switching), while PMV40UN2R provides 12nC (higher, slower switching). Select based on switching frequency requirements and driver capabilities.

Q: Can I mix substitute parts from different manufacturers in the same design?

A: Yes. All recommended substitutes meet identical electrical specifications (30V Vdss, ≥3.4A Id, SOT-23-3 package). Mixing manufacturers is acceptable provided each part meets your application's current, voltage, and thermal requirements. Maintain consistent part selection within production batches to ensure supply chain stability.

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