AOD4102 N-Channel MOSFET 30V 8A/19A TO-252 Equivalent & Substitute Parts

Part Overview

The AOD4102 is an N-Channel MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 30V drain-to-source voltage with continuous drain current of 8A (Ta) or 19A (Tc) in a surface mount TO-252 (DPAK) package. The device is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across voltage ratings, current handling, thermal characteristics, and mechanical packaging to ensure direct replacement capability.

Substiute Parts

AOD4102

Alpha & Omega Semiconductor Inc.In Stock: 20099AOD4102 Datasheet

Current PartRFQ

IRLR2703TRPBF

Infineon TechnologiesIn Stock: 8010IRLR2703TRPBF Datasheet

MFR RecommendedRFQ

STD17NF03LT4

STMicroelectronicsIn Stock: 8802STD17NF03LT4 Datasheet

MFR RecommendedRFQ

STD18NF03L

STMicroelectronicsIn Stock: 2947STD18NF03L Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AOD4102 is determined by the following critical parameters:

Mandatory Compatibility Criteria:

• Drain-to-Source Voltage (Vdss): Must equal or exceed 30V
• FET Type: Must be N-Channel
• Technology: Must be MOSFET (Metal Oxide)
• Package Type: Must be TO-252 (DPAK) surface mount
• Operating Temperature Range: Must encompass -55°C to 175°C
• Continuous Drain Current (Tc): Must meet or exceed 19A at case temperature

Electrical Performance Parameters:

• On-State Resistance (Rds On): Lower values indicate improved performance; substitutes with higher Rds On remain functionally compatible
• Gate Threshold Voltage (Vgs(th)): Must be compatible with existing gate drive circuitry
• Gate Charge (Qg): Affects switching speed and drive requirements
• Input Capacitance (Ciss): Influences gate drive circuit design

All three substitute parts (IRLR2703TRPBF, STD17NF03LT4, STD18NF03L) meet the mandatory compatibility criteria and are classified as active products with current manufacturing status.

Parameter Comparison

Engineering Selection Recommendations

IRLR2703TRPBF (Infineon Technologies HEXFET® Series)

The IRLR2703TRPBF is an active product offering the highest continuous drain current rating at 23A (Tc), exceeding the AOD4102 specification by 21%. This device provides superior thermal performance with 45W power dissipation capability compared to the original 21W. The lower gate threshold voltage (1V) and higher gate charge (15 nC) require evaluation against existing gate drive circuit parameters. RoHS3 compliance and active manufacturing status support long-term supply chain continuity. This substitute is suitable for applications requiring enhanced current handling and thermal margin.

STD17NF03LT4 (STMicroelectronics STripFET™ II Series)

The STD17NF03LT4 is an active product rated for 17A continuous drain current (Tc), providing 89% of the original AOD4102 current specification. On-state resistance of 50 mOhm is higher than the original 37 mOhm, resulting in increased power dissipation under identical load conditions. Gate threshold voltage of 2.2V and gate charge of 6.5 nC are closely aligned with the original device characteristics. RoHS3 compliance and active status ensure regulatory compliance and supply availability. This substitute is appropriate for applications where current requirements are within the 17A range and thermal design accommodates the 30W dissipation limit.

STD18NF03L (STMicroelectronics STripFET™ II Series)

The STD18NF03L is an active product with electrical specifications identical to the STD17NF03LT4, rated for 17A continuous drain current (Tc) and 30W power dissipation. This device shares the same gate threshold voltage (2.2V), gate charge (6.5 nC), and on-state resistance (50 mOhm) characteristics. RoHS3 compliance and active manufacturing status provide regulatory alignment and supply chain stability. This substitute is functionally equivalent to the STD17NF03LT4 and is suitable for identical application requirements.

All three substitute parts maintain the mandatory 30V Vdss rating, N-Channel configuration, MOSFET technology, TO-252 (DPAK) package format, and -55°C to 175°C operating temperature range required for direct replacement of the obsolete AOD4102.

Frequently Asked Questions (FAQ)

Q: Can the IRLR2703TRPBF directly replace the AOD4102 in all applications?

A: The IRLR2703TRPBF meets all mandatory compatibility criteria: 30V Vdss, N-Channel MOSFET, TO-252 (DPAK) package, and -55°C to 175°C operating range. The higher continuous drain current (23A vs. 19A) and power dissipation (45W vs. 21W) provide performance margin. However, the lower gate threshold voltage (1V vs. 3V) and higher gate charge (15 nC vs. 6.6 nC) require verification against gate drive circuit specifications to ensure proper switching operation.

Q: What is the difference between STD17NF03LT4 and STD18NF03L?

A: Both devices are STMicroelectronics STripFET™ II series components with identical electrical specifications: 17A continuous drain current (Tc), 30W power dissipation, 50 mOhm on-state resistance, 2.2V gate threshold voltage, and 6.5 nC gate charge. The primary difference is packaging format designation. Both are functionally equivalent for the AOD4102 replacement application.

Q: Why is the on-state resistance (Rds On) higher in the STMicroelectronics substitutes?

A: The STD17NF03LT4 and STD18NF03L exhibit 50 mOhm on-state resistance compared to the AOD4102's 37 mOhm. This difference reflects different device design and manufacturing processes between manufacturers. Higher Rds On results in increased power dissipation under identical current conditions. Thermal design calculations must account for this parameter when selecting between substitute options.

Q: Are all substitute parts RoHS compliant?

A: Yes. The IRLR2703TRPBF, STD17NF03LT4, and STD18NF03L are all ROHS3 compliant. The original AOD4102 RoHS status was not specified in the provided data. All substitute parts carry REACH Unaffected designation and Moisture Sensitivity Level 1 (Unlimited), matching the original device classification.

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

A: Gate threshold voltage (Vgs(th)) determines the minimum gate-to-source voltage required to initiate channel conduction. The AOD4102 specifies 3V, while the IRLR2703TRPBF specifies 1V and the STMicroelectronics devices specify 2.2V. Gate drive circuits must supply sufficient voltage to exceed the threshold and achieve full on-state conduction. Lower threshold voltages allow operation with reduced gate drive voltage but may increase susceptibility to parasitic gate charge effects. Existing gate drive circuits must be evaluated for compatibility with each substitute's threshold specification.

Q: Can the STMicroelectronics substitutes handle the full 19A continuous current of the AOD4102?

A: The STD17NF03LT4 and STD18NF03L are rated for 17A continuous drain current (Tc), which is 89% of the AOD4102's 19A specification. These devices cannot sustain the full 19A rating without exceeding their continuous current specification. Applications requiring sustained 19A operation must use the IRLR2703TRPBF (23A rating) or maintain current levels below 17A when using STMicroelectronics substitutes.

Q: What packaging considerations apply to these substitutes?

A: All substitute parts utilize TO-252 (DPAK) surface mount packaging, identical to the AOD4102. The IRLR2703TRPBF is designated TO-252AA (DPAK), while the STMicroelectronics devices are designated DPAK. All three packages are mechanically and electrically compatible with existing PCB layouts designed for the original AOD4102. No board redesign is required for package accommodation.

Q: How do gate charge differences affect switching performance?

A: Gate charge (Qg) represents the total charge required to switch the device from off to on state. The AOD4102 specifies 6.6 nC at 10V, while the IRLR2703TRPBF specifies 15 nC at 4.5V and the STMicroelectronics devices specify 6.5 nC at 5V. Higher gate charge requires longer switching times and increased gate drive current capacity. Gate drive circuits must supply sufficient current to charge the gate within the required switching time window. The STMicroelectronics substitutes offer gate charge characteristics closely aligned with the original device.