IPD04N03LB G N-Channel 30V 50A MOSFET Equivalent & Substitute Parts

Part Overview

The IPD04N03LB G is an N-Channel 30V 50A MOSFET manufactured by Infineon Technologies in the OptiMOS™ series. This device is classified as Obsolete, indicating it has reached end-of-life status and is no longer recommended for new designs. The part is packaged in TO-252-3 (DPAK) surface mount configuration with a maximum power dissipation of 115W at case temperature.

Due to its obsolete status, alternative components from active product lines are necessary for new circuit designs and long-term supply chain continuity. Substitute parts must maintain electrical compatibility across drain-source voltage, continuous drain current, on-resistance characteristics, and thermal performance parameters while conforming to the same or compatible package specifications.

Key Parameters

Parameter	Value	Unit	Condition
Drain to Source Voltage (Vdss)	30	V	Absolute Maximum
Continuous Drain Current (Id)	50	A	@ 25°C (Tc)
On-Resistance (Rds On Max)	4.1	mOhm	@ 50A, 10V Vgs
Gate Threshold Voltage (Vgs th)	2	V	@ 70µA Id (Max)
Gate Charge (Qg)	40	nC	@ 5V Vgs (Max)
Input Capacitance (Ciss)	5200	pF	@ 15V Vds (Max)
Power Dissipation (Max)	115	W	@ Tc
Operating Temperature Range	-55 to 175	°C	Tj
Package Type	TO-252-3 (DPAK)	-	Surface Mount
Product Status	Obsolete	-	-

Substitute Part Grouping Explanation

Substitution of the IPD04N03LB G is determined by strict adherence to the following electrical and mechanical criteria:

Primary Substitution Criteria:

Drain-Source Voltage (Vdss): Must equal or exceed 30V
Package Type: Must be TO-252-3 (DPAK) or compatible surface mount variant
Continuous Drain Current (Id): Must support minimum 50A @ 25°C
On-Resistance (Rds On): Must not exceed 4.1 mOhm @ specified current and gate voltage
Gate Threshold Voltage: Must fall within acceptable switching range (typically 2V to 3V @ 250µA)
Operating Temperature: Must support -55°C to 175°C range
Moisture Sensitivity Level: MSL 1 (Unlimited) preferred for reliability

Secondary Compatibility Parameters:

Gate Charge (Qg): Lower values reduce switching losses; values up to 76 nC acceptable
Input Capacitance (Ciss): Values between 1950 pF and 5200 pF maintain circuit performance
Power Dissipation: Minimum 50W @ Tc required; higher ratings provide thermal margin

Substitute parts are grouped into two categories: Direct Infineon Replacements (same manufacturer, active status) and Cross-Manufacturer Alternatives (Alpha & Omega, Diodes, onsemi, STMicroelectronics) that meet all electrical specifications within the defined parameter windows.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On Max (mOhm)	Vgs th (V)	Qg (nC)	Ciss (pF)	Pd Max (W)	Status	Package
IPD04N03LB G	Infineon	30	50	4.1	2	40	5200	115	Obsolete	TO-252-3
IPD040N03LGATMA1	Infineon	30	90	4	2.2	38	3900	79	Active	TO-252-3
AOD4132	Alpha & Omega	30	85	4	3	76	4400	100	Active	TO-252
DMTH3004LK3-13	Diodes Inc.	30	75	4	3	44	2370	1.9	Active	TO-252-3
FDD8870	onsemi	30	160	3.9	2.5	118	5160	160	Obsolete	TO-252AA
NVD4C05NT4G	onsemi	30	90	4.1	2.2	14	1950	57	Active	DPAK
STD100N3LF3	STMicroelectronics	30	80	5.5	2.5	27	2060	110	Obsolete	DPAK
NTD4965NT4G	onsemi	30	68	4.7	2.5	17.2	1710	1.39	Active	DPAK-3
STD17NF03LT4	STMicroelectronics	30	17	50	2.2	6.5	320	30	Active	DPAK
AOD514	Alpha & Omega	30	46	6.5	2.6	22.5	951	50	Not For New Designs	TO-252

Engineering Selection Recommendations

Tier 1: Recommended Direct Replacements (Active Status, Same Manufacturer)

IPD040N03LGATMA1 is the primary recommended substitute. This Infineon OptiMOS™ device maintains identical voltage rating (30V) and package configuration (TO-252-3) while offering superior specifications: 90A continuous drain current (versus 50A), 4 mOhm on-resistance (versus 4.1 mOhm), and active product status ensuring long-term availability. The device is RoHS3 compliant and carries AEC-Q101 automotive qualification through the NVD4C05NT4G variant lineage.

Tier 2: Cross-Manufacturer Active Alternatives

NVD4C05NT4G (onsemi) provides automotive-grade qualification (AEC-Q101) with 90A continuous current capability and superior gate charge characteristics (14 nC versus 40 nC), reducing switching losses in high-frequency applications. This device is actively produced and maintains full TO-252-3 package compatibility.

AOD4132 (Alpha & Omega Semiconductor) delivers 85A continuous current with 4 mOhm on-resistance and active product status. This part offers the highest power dissipation rating (100W) among cross-manufacturer options, providing thermal margin for demanding applications.

DMTH3004LK3-13 (Diodes Incorporated) is an active product offering 75A continuous current with 4 mOhm on-resistance and RoHS3 compliance. This device is suitable for applications where gate charge optimization (44 nC) is secondary to current capacity.

Tier 3: Obsolete Alternatives (Not Recommended for New Designs)

FDD8870 (onsemi PowerTrench®) and STD100N3LF3 (STMicroelectronics STripFET™ II) are classified as obsolete. While FDD8870 offers exceptional 160A current capability, its obsolete status and higher gate charge (118 nC) make it unsuitable for new designs. STD100N3LF3 exhibits higher on-resistance (5.5 mOhm) and obsolete status.

Tier 4: Limited Current Capacity (Not Recommended)

STD17NF03LT4 and AOD514 provide only 17A and 46A continuous current respectively, falling below the 50A minimum requirement of the original IPD04N03LB G. These parts are unsuitable for direct substitution in applications requiring full 50A capacity.

Compliance and Certification:

All recommended Tier 1 and Tier 2 parts maintain MSL 1 (Unlimited) moisture sensitivity rating, REACH Unaffected status, and EAR99 export classification. NVD4C05NT4G carries explicit AEC-Q101 automotive qualification. All parts support the full -55°C to 175°C operating temperature range.

Frequently Asked Questions (FAQ)

Q1: Can IPD040N03LGATMA1 directly replace IPD04N03LB G in existing circuit boards?

A: Yes. IPD040N03LGATMA1 is pin-compatible in TO-252-3 package and maintains identical voltage rating (30V). The higher current rating (90A versus 50A) and lower on-resistance (4 mOhm versus 4.1 mOhm) provide performance improvement without circuit modification. Verify PCB thermal design accommodates the different power dissipation profile (79W versus 115W at Tc).

Q2: What is the primary difference between Tier 1 and Tier 2 substitutes?

A: Tier 1 substitutes (IPD040N03LGATMA1) are from the original manufacturer (Infineon) with active product status and identical series designation (OptiMOS™). Tier 2 substitutes are from alternative manufacturers (onsemi, Alpha & Omega, Diodes, STMicroelectronics) but maintain full electrical compatibility and active production status. Tier 1 is preferred for supply chain continuity; Tier 2 offers redundancy and alternative sourcing.

Q3: Why is FDD8870 listed as a substitute if it is obsolete?

A: FDD8870 is included for reference in applications where existing inventory exists. However, it is not recommended for new designs due to obsolete status. Its 160A current capability and 3.9 mOhm on-resistance exceed original specifications, but higher gate charge (118 nC) increases switching losses. New designs should select active alternatives from Tier 1 or Tier 2.

Q4: Can NTD4965NT4G or STD17NF03LT4 be used as substitutes?

A: No. NTD4965NT4G provides only 68A continuous current (acceptable), but STD17NF03LT4 provides only 17A continuous current, significantly below the 50A requirement. Neither device meets the minimum current specification for direct substitution. These parts are suitable only for lower-current applications requiring 30V rating.

Q5: What does "Not For New Designs" status mean for AOD514?

A: AOD514 is in production but not recommended for new circuit designs. This status indicates the manufacturer may discontinue the product without notice. While technically compatible (30V, 46A continuous current), the lower current rating (46A versus 50A) and higher on-resistance (6.5 mOhm versus 4.1 mOhm) make it unsuitable. Select Tier 1 or Tier 2 active alternatives instead.

Q6: How do gate charge differences affect circuit performance?

A: Gate charge (Qg) determines the energy required to switch the MOSFET on and off. Lower gate charge reduces switching losses and allows higher switching frequencies. NVD4C05NT4G (14 nC) and STD17NF03LT4 (6.5 nC) offer significant advantages in high-frequency applications. IPD04N03LB G (40 nC) and IPD040N03LGATMA1 (38 nC) are comparable. Higher values like AOD4132 (76 nC) and FDD8870 (118 nC) increase switching losses but may be acceptable in lower-frequency designs.

Q7: Are all substitute parts RoHS3 compliant?

A: All Tier 1 and Tier 2 active alternatives are RoHS3 compliant. IPD04N03LB G (original part) does not specify RoHS status. Obsolete parts (FDD8870, STD100N3LF3) are RoHS3 compliant. Verify RoHS compliance requirements for your specific application before final part selection.

Q8: What package compatibility issues should be considered?

A: All substitute parts use TO-252-3 (DPAK) or compatible variants (DPAK-3, TO-252AA). These packages are mechanically and electrically interchangeable on standard PCB layouts. FDD8870 uses TO-252AA variant, which is functionally identical to TO-252-3. No PCB redesign is required for package compatibility. Verify thermal pad design accommodates the specific part's power dissipation rating.

Q9: Which substitute offers the best thermal performance?

A: FDD8870 provides the highest power dissipation rating (160W at Tc), followed by IPD04N03LB G (115W) and STD100N3LF3 (110W). For active products, AOD4132 (100W) and IPD040N03LGATMA1 (79W) are the highest-rated. Thermal performance depends on PCB layout, copper area, and thermal management design. Select based on application power dissipation requirements, not maximum ratings alone.

Q10: Can multiple substitute parts be used interchangeably in production?

A: Yes, with qualification. All Tier 1 and Tier 2 parts meet the electrical specifications of IPD04N03LB G. However, production designs should select a single primary part and one qualified alternative to minimize supply chain complexity. Verify gate charge, on-resistance, and thermal characteristics match circuit simulation before production release. Document part selection rationale for traceability.

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