IPP03N03LB G N-Channel 30V 80A MOSFET Equivalent & Substitute Parts

Part Overview

The IPP03N03LB G is an N-Channel 30V 80A MOSFET manufactured by Infineon Technologies in the OptiMOS™ series. This device is rated for 150W power dissipation and housed in a TO-220-3 through-hole package. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The IPP03N03LB G serves in applications requiring moderate current switching at 30V drain-source voltage with through-hole mounting. Due to its obsolete status, identifying functionally compatible alternatives ensures design continuity and supply chain flexibility.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	30	V
Continuous Drain Current (Id) @ 25°C	80	A (Tc)
On-State Resistance (Rds On) @ 55A, 10V	3.1	mOhm
Gate Threshold Voltage (Vgs(th)) @ 100µA	2	V
Gate Charge (Qg) @ 5V	59	nC
Power Dissipation (Max)	150	W (Tc)
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	TO-220-3	Through Hole
Maximum Gate Voltage (Vgs)	±20	V

Substitute Part Grouping Explanation

Substitution of the IPP03N03LB G is determined by the following critical parameters:

Primary Matching Criteria:

Drain-Source Voltage (Vdss): 30V minimum
Continuous Drain Current (Id): 80A or greater at 25°C
Package Type: TO-220-3 through-hole configuration
Operating Temperature Range: -55°C to 175°C or equivalent
Gate Voltage Rating (Vgs): ±20V

Secondary Compatibility Factors:

On-State Resistance (Rds On): Lower or equivalent values ensure thermal performance
Gate Charge (Qg): Lower values reduce switching losses
Power Dissipation Rating: 140W or greater maintains thermal margin

Substitute parts are grouped into two categories:

Category A - Direct Functional Equivalents (80A-100A range): Parts meeting or exceeding the 80A continuous drain current specification with matching voltage and package requirements. These include IRLB8743PBF, FDP8030L, PSMN2R0-30PL,127, PSMN3R4-30PL,127, and PSMN4R3-30PL,127.

Category B - Enhanced Performance Alternatives (100A+ range): Parts exceeding 80A specification, providing additional current margin and improved thermal characteristics. These include IRF3703PBF and STP160N3LL.

All substitute parts maintain N-Channel MOSFET technology, 30V Vdss rating, and through-hole TO-220 package family compatibility.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Qg (nC)	Power Diss. (W)	Status	Package
IPP03N03LB G	Infineon	30	80	3.1 @ 55A, 10V	59 @ 5V	150	Obsolete	TO-220-3
IRF3703PBF	International Rectifier	30	210	2.8 @ 76A, 10V	209 @ 10V	230	Active	TO-220-3
IRLB8743PBF	Infineon	30	78	3.2 @ 40A, 10V	54 @ 4.5V	140	Active	TO-220-3
FDP8030L	Fairchild Semiconductor	30	80	3.5 @ 80A, 10V	170 @ 5V	187	Active	TO-220-3
PSMN2R0-30PL,127	Nexperia USA Inc.	30	100	2.1 @ 15A, 10V	117 @ 10V	211	Obsolete	TO-220-3
PSMN3R4-30PL,127	Nexperia USA Inc.	30	100	3.4 @ 10A, 10V	64 @ 10V	114	Obsolete	TO-220-3
PSMN4R3-30PL,127	Nexperia USA Inc.	30	100	4.3 @ 15A, 10V	41.5 @ 10V	103	Obsolete	TO-220-3
STP105N3LL	STMicroelectronics	30	80	3.5 @ 40A, 10V	42 @ 4.5V	140	Active	TO-220-3
STP160N3LL	STMicroelectronics	30	120	3.2 @ 60A, 10V	42 @ 4.5V	136	Active	TO-220-3

Engineering Selection Recommendations

For Direct Replacement (Matching 80A Specification):

IRLB8743PBF is the primary recommendation. This part is manufactured by Infineon (same as the original), maintains active product status, and delivers 78A continuous drain current with comparable on-state resistance (3.2 mOhm vs. 3.1 mOhm). Gate charge is lower (54 nC vs. 59 nC), reducing switching losses. Power dissipation rating of 140W provides adequate thermal margin. RoHS3 compliance and REACH unaffected status confirm regulatory alignment.

FDP8030L from Fairchild Semiconductor provides an alternative with identical 80A rating and active status. This part offers superior power dissipation (187W vs. 150W), though gate charge is higher (170 nC vs. 59 nC). Selection depends on switching frequency requirements.

STP105N3LL from STMicroelectronics matches the 80A specification with active product status and lower gate charge (42 nC), beneficial for high-frequency applications. Power dissipation of 140W is equivalent to IRLB8743PBF.

For Enhanced Performance (100A+ Specification):

STP160N3LL provides 120A continuous drain current with active status and the lowest gate charge (42 nC @ 4.5V) among all alternatives. This part is suitable for applications requiring additional current margin or lower switching losses.

IRF3703PBF delivers the highest current rating (210A) and power dissipation (230W), offering maximum thermal and current headroom. Higher gate charge (209 nC) requires consideration in high-frequency designs.

Obsolete Part Alternatives:

PSMN2R0-30PL,127, PSMN3R4-30PL,127, and PSMN4R3-30PL,127 are all obsolete. While these parts meet electrical specifications, their obsolete status limits long-term procurement viability. Use only if existing inventory is available and supply chain continuity is not a concern.

Regulatory and Compliance Considerations:

All recommended active-status parts (IRLB8743PBF, FDP8030L, STP105N3LL, STP160N3LL, IRF3703PBF) carry RoHS3 compliance and REACH unaffected status, ensuring compatibility with current environmental regulations. ECCN classification (EAR99) is consistent across all parts.

Frequently Asked Questions (FAQ)

Q: Can I use IRF3703PBF as a direct replacement for IPP03N03LB G?

A: IRF3703PBF is electrically compatible but not a direct pin-for-pin replacement. While both are TO-220-3 packages with 30V Vdss rating, IRF3703PBF delivers 210A continuous drain current versus 80A for the original part. This higher current capability makes it suitable for the same application with improved thermal margin. However, the significantly higher gate charge (209 nC vs. 59 nC) may affect switching frequency performance. Verify gate drive circuit compatibility before substitution.

Q: What is the difference between IRLB8743PBF and STP105N3LL?

A: Both parts match the 80A continuous drain current specification and maintain 30V Vdss rating. IRLB8743PBF is manufactured by Infineon (same as the original IPP03N03LB G) with 3.2 mOhm on-state resistance. STP105N3LL from STMicroelectronics offers lower gate charge (42 nC vs. 54 nC), reducing switching losses in high-frequency applications. On-state resistance is identical (3.5 mOhm). Selection depends on switching frequency requirements and preferred manufacturer.

Q: Why do some substitute parts have higher current ratings (100A, 120A, 210A)?

A: Higher current ratings provide additional design margin and thermal headroom. These parts are suitable for the same 80A application with improved reliability and reduced junction temperature during operation. Higher current capability does not negatively affect performance at lower current levels. Selection should consider thermal management requirements and cost constraints.

Q: Are all substitute parts RoHS3 compliant?

A: All active-status substitute parts (IRLB8743PBF, FDP8030L, STP105N3LL, STP160N3LL, IRF3703PBF) are RoHS3 compliant with REACH unaffected status. Obsolete parts (PSMN series) also carry RoHS3 compliance. Verify compliance documentation for specific procurement requirements.

Q: What is the impact of gate charge differences on circuit design?

A: Gate charge (Qg) determines the energy required to switch the MOSFET on and off. Lower gate charge (42-54 nC) reduces switching losses and allows higher switching frequencies with the same gate drive circuit. Higher gate charge (170-209 nC) requires more gate drive energy and may limit maximum switching frequency. For applications operating below 100 kHz, gate charge differences have minimal impact. High-frequency designs (>500 kHz) should prioritize lower gate charge values.

Q: Can I use STP160N3LL (120A) in place of IPP03N03LB G (80A)?

A: Yes. STP160N3LL is fully compatible with 30V Vdss, TO-220-3 package, and -55°C to 175°C operating range. The 120A rating provides 50% additional current margin, improving thermal performance and reliability. Lower gate charge (42 nC) reduces switching losses. This substitution is suitable for all applications designed for the original 80A part.

Q: What is the difference between TO-220-3 and TO-220AB packages?

A: Both are through-hole TO-220 family packages with identical pin configuration and mechanical dimensions. TO-220-3 and TO-220AB are functionally interchangeable. Some manufacturers use different nomenclature for the same physical package. Verify mechanical drawings if package designation differs from the original design.

Q: Why is IPP03N03LB G listed as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. Existing inventory may be available from distributors, but long-term supply cannot be guaranteed. Designing with active-status alternatives (IRLB8743PBF, FDP8030L, STP105N3LL, STP160N3LL) ensures supply chain continuity and reduces procurement risk.

Q: Should I prioritize active-status parts over obsolete alternatives?

A: Yes. Active-status parts ensure long-term availability, ongoing manufacturer support, and compliance with current environmental regulations. Obsolete parts should be used only when existing inventory is available and supply chain continuity is not a design requirement. For new designs, select from active-status alternatives.

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