IRL3803 N-Channel 30V 140A MOSFET Equivalent & Substitute Parts

Part Overview

The IRL3803 is an N-Channel MOSFET manufactured by Infineon Technologies in the HEXFET® series, rated for 30V drain-source voltage and 140A continuous drain current at 25°C. The device is housed in a TO-220AB through-hole package and dissipates up to 200W at the case temperature. The IRL3803 is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating packaging and compliance requirements.

Key Parameters

Parameter	Value	Unit
Drain-Source Voltage (Vdss)	30	V
Continuous Drain Current (Id) @ 25°C	140	A (Tc)
On-State Resistance (Rds On) @ 71A, 10V	6	mOhm
Power Dissipation (Max)	200	W (Tc)
Gate Threshold Voltage (Vgs(th)) @ 250µA	1	V
Gate Charge (Qg) @ 4.5V	140	nC
Input Capacitance (Ciss) @ 25V	5000	pF
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	TO-220AB	Through Hole
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the IRL3803 is determined by the following critical parameters:

Electrical Compatibility Criteria:

Drain-Source Voltage (Vdss) must equal or exceed 30V
Continuous Drain Current (Id) must equal or exceed 140A at 25°C
On-State Resistance (Rds On) must not significantly exceed 6mOhm to maintain thermal performance
Power Dissipation capability must support the application thermal budget
Gate Threshold Voltage (Vgs(th)) and Gate Charge (Qg) affect switching characteristics and driver compatibility

Mechanical Compatibility Criteria:

Mounting type must be Through Hole
Package must be TO-220AB or equivalent TO-220-3 footprint

Compliance Criteria:

RoHS and REACH compliance status
Moisture Sensitivity Level (MSL) rating

Substitute parts are grouped into three categories based on these parameters: direct equivalents (identical electrical specifications), functional equivalents (meet or exceed all critical parameters), and alternative options (meet minimum requirements with trade-offs in specific parameters).

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Power Diss. (W)	Vgs(th) (V)	Qg (nC)	Package	Product Status	RoHS Status
IRL3803	Infineon	30	140	6.0	200	1.0	140	TO-220AB	Obsolete	Non-compliant
IRL3803PBF	Infineon	30	140	6.0	200	1.0	140	TO-220AB	Not For New Designs	ROHS3 Compliant
IRL7833PBF	Infineon	30	150	3.8	140	2.3	47	TO-220AB	Not For New Designs	ROHS3 Compliant
IRLB8748PBF	Infineon	30	92	4.8	75	2.35	23	TO-220AB	Active	ROHS3 Compliant
PSMN2R0-30PL,127	Nexperia	30	100	2.1	211	2.15	117	TO-220AB	Obsolete	ROHS3 Compliant
PSMN4R3-30PL,127	Nexperia	30	100	4.3	103	2.15	41.5	TO-220AB	Obsolete	ROHS3 Compliant
STP95N4F3	STMicroelectronics	40	80	6.2	110	4.0	54	TO-220	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent (Identical Specifications):

IRL3803PBF is the direct equivalent of IRL3803, maintaining identical electrical specifications (30V, 140A, 6mOhm Rds On, 200W power dissipation). The primary difference is packaging format (Tube) and RoHS3 compliance status. IRL3803PBF is classified as "Not For New Designs," indicating Infineon has transitioned this product line. This part is suitable for replacement in existing applications where RoHS3 compliance is required.

Functional Equivalent (Meets or Exceeds Specifications):

IRL7833PBF exceeds the IRL3803 in continuous drain current (150A vs. 140A) and power dissipation capability (140W vs. 200W case temperature rating). The on-state resistance is superior at 3.8mOhm versus 6mOhm. However, gate threshold voltage is higher (2.3V vs. 1.0V), which may affect gate drive circuit compatibility. IRL7833PBF is ROHS3 compliant and rated "Not For New Designs."

Alternative Options (Reduced Current Rating):

IRLB8748PBF is an active Infineon product with ROHS3 compliance. It provides 92A continuous drain current, which is below the IRL3803 specification of 140A. This part is suitable only for applications where the actual current requirement is 92A or less. Power dissipation is limited to 75W. IRLB8748PBF offers superior on-state resistance (4.8mOhm) and lower gate charge (23nC), making it suitable for high-frequency switching applications with reduced current demands.

PSMN2R0-30PL,127 (Nexperia) provides 100A continuous drain current with excellent on-state resistance of 2.1mOhm and superior power dissipation of 211W. This part is suitable for applications requiring lower current than the IRL3803 but with higher thermal performance. RoHS3 compliant but classified as obsolete.

PSMN4R3-30PL,127 (Nexperia) provides 100A continuous drain current with 4.3mOhm on-state resistance and 103W power dissipation. This part is suitable for lower-current applications with moderate thermal requirements. RoHS3 compliant but classified as obsolete.

Higher Voltage Alternative:

STP95N4F3 (STMicroelectronics) is an active product with 40V drain-source voltage rating, exceeding the IRL3803 by 10V. Continuous drain current is 80A, below the IRL3803 specification. This part is suitable only for applications where higher voltage headroom is required and current demand does not exceed 80A. RoHS3 compliant and active product status.

Frequently Asked Questions (FAQ)

Q: Can IRL3803PBF be used as a direct replacement for IRL3803?

A: Yes. IRL3803PBF is electrically identical to IRL3803, with the same 30V rating, 140A continuous drain current, 6mOhm on-state resistance, and 200W power dissipation. The primary differences are packaging format (Tube vs. bulk) and RoHS3 compliance. Both are classified as obsolete or "Not For New Designs," but IRL3803PBF is suitable for direct substitution in existing designs.

Q: Is IRL7833PBF a suitable replacement for IRL3803?

A: IRL7833PBF can replace IRL3803 in applications where the actual current requirement does not exceed 150A and the gate drive circuit can accommodate a higher threshold voltage (2.3V vs. 1.0V). IRL7833PBF provides superior on-state resistance (3.8mOhm) but lower power dissipation rating (140W vs. 200W). Verify gate drive compatibility before substitution.

Q: Why does IRLB8748PBF have lower current rating than IRL3803?

A: IRLB8748PBF is designed for different application requirements. It provides 92A continuous drain current, which is 34% lower than IRL3803. However, it offers superior on-state resistance (4.8mOhm) and significantly lower gate charge (23nC vs. 140nC), making it suitable for high-frequency switching applications with lower current demands. Use IRLB8748PBF only if your application current requirement is 92A or less.

Q: Can I use STP95N4F3 as a substitute for IRL3803?

A: STP95N4F3 is not a direct substitute. It has a higher drain-source voltage rating (40V vs. 30V) but lower continuous drain current (80A vs. 140A). Use STP95N4F3 only if your application requires higher voltage headroom and the actual current demand does not exceed 80A. Verify thermal and electrical requirements before substitution.

Q: What is the difference between Nexperia PSMN2R0-30PL,127 and PSMN4R3-30PL,127?

A: Both Nexperia parts are rated for 30V and 100A continuous drain current. PSMN2R0-30PL,127 has superior on-state resistance (2.1mOhm vs. 4.3mOhm) and higher power dissipation capability (211W vs. 103W), making it suitable for applications with higher thermal demands. PSMN4R3-30PL,127 has lower gate charge (41.5nC vs. 117nC), making it suitable for faster switching applications. Both are obsolete products.

Q: Are all substitute parts RoHS3 compliant?

A: No. The original IRL3803 is RoHS non-compliant. IRL3803PBF, IRL7833PBF, IRLB8748PBF, PSMN2R0-30PL,127, PSMN4R3-30PL,127, and STP95N4F3 are all ROHS3 compliant. If RoHS3 compliance is required for your application, select from the compliant alternatives listed above.

Q: What is the impact of different gate threshold voltages on substitution?

A: Gate threshold voltage (Vgs(th)) affects the gate drive circuit design. IRL3803 has Vgs(th) of 1.0V, while most substitutes have higher values (2.15V to 4.0V). Higher threshold voltages require higher gate drive voltage to achieve full on-state conduction. Verify that your gate drive circuit can supply sufficient voltage to meet the substitute part's threshold specification before substitution.

Q: Can I use a lower-current part if my application does not require 140A?

A: Yes, provided the substitute part's continuous drain current rating meets or exceeds your actual application current requirement. For example, if your application requires 80A, IRLB8748PBF (92A rating) or STP95N4F3 (80A rating) are suitable. Ensure all other electrical parameters (voltage, power dissipation, thermal management) are compatible with your application.

Q: What is the significance of on-state resistance (Rds On) in substitution?

A: On-state resistance directly affects power dissipation and thermal performance. Lower Rds On values result in lower power loss and reduced heat generation. IRL3803 has 6mOhm Rds On. Substitutes with lower Rds On (such as PSMN2R0-30PL,127 at 2.1mOhm) provide better thermal performance, while those with higher Rds On may require enhanced thermal management.

Q: Are all substitute parts available in TO-220AB packaging?

A: Yes. All substitute parts listed are available in TO-220AB or equivalent TO-220-3 through-hole packaging, ensuring mechanical compatibility with IRL3803 PCB layouts. STP95N4F3 is specified as TO-220 (without the "AB" designation), but maintains the same three-lead through-hole footprint.

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