IRLR3715Z Equivalent & Substitute Parts

Part Overview

The IRLR3715Z is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 20V drain-to-source voltage with 49A continuous drain current at 25°C. This device is housed in a TO-252AA (DPAK) surface mount package and is designed for applications requiring moderate voltage and current switching capabilities. The IRLR3715Z is classified as obsolete, making identification of functionally equivalent substitute parts necessary for ongoing design support, maintenance, and production continuity.

Substiute Parts

IRLR3715Z

Infineon TechnologiesIn Stock: 43395IRLR3715Z Datasheet

Current PartRFQ

STD100N3LF3

STMicroelectronicsIn Stock: 15489STD100N3LF3 Datasheet

MFR RecommendedRFQ

STD150N3LLH6

STMicroelectronicsIn Stock: 10334STD150N3LLH6 Datasheet

MFR RecommendedRFQ

SUD50N024-09P-E3

Vishay SiliconixIn Stock: 15450SUD50N024-09P-E3 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the IRLR3715Z is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• FET Type: N-Channel topology must be maintained
• Drain to Source Voltage (Vdss): Substitute must equal or exceed 20V
• Continuous Drain Current (Id): Substitute must equal or exceed 49A at 25°C
• Gate Threshold Voltage (Vgs(th)): Must be compatible with existing gate drive circuits
• On-State Resistance (Rds On): Lower values indicate improved performance; higher values require thermal evaluation
• Operating Temperature Range: Must support -55°C to 175°C minimum

Mechanical Compatibility Criteria:

• Package Type: TO-252-3 (DPAK) surface mount package required for PCB compatibility
• Mounting Type: Surface mount configuration

The substitute parts identified (STD100N3LF3, STD150N3LLH6, and SUD50N024-09P-E3) meet or exceed these parameters while maintaining package compatibility. All substitutes are N-Channel MOSFETs in DPAK packaging with Vdss ratings of 22V to 30V and Id ratings of 49A to 80A, ensuring functional equivalence or improvement over the original part.

Parameter Comparison

Engineering Selection Recommendations

SUD50N024-09P-E3 (Vishay Siliconix)

The SUD50N024-09P-E3 is the primary recommended substitute for the IRLR3715Z. This device matches the original part's electrical specifications with 22V Vdss and 49A continuous drain current, providing direct functional equivalence. The SUD50N024-09P-E3 maintains the same TO-252-3 (DPAK) package configuration, ensuring PCB compatibility without layout modifications. Critically, this part carries Active product status and ROHS3 compliance, addressing the obsolescence and regulatory limitations of the original IRLR3715Z. The on-state resistance of 9.5 mOhm at 20A, 10V is comparable to the original specification, and power dissipation capability of 39.5W (Tc) is sufficient for equivalent thermal performance.

STD100N3LF3 and STD150N3LLH6 (STMicroelectronics)

Both STMicroelectronics alternatives provide enhanced electrical performance with 30V Vdss and 80A continuous drain current ratings, exceeding the original IRLR3715Z specifications. These parts are suitable for applications where higher voltage or current margins are acceptable. The STD150N3LLH6 offers superior on-state resistance of 2.8 mOhm at 40A, 10V, resulting in lower power dissipation and improved thermal efficiency. Both devices maintain DPAK packaging and support the full -55°C to 175°C operating temperature range. However, both parts are classified as obsolete. The STD100N3LF3 and STD150N3LLH6 are appropriate for designs where performance enhancement is prioritized and long-term availability is not a primary concern.

Compliance and Availability Considerations

The IRLR3715Z is RoHS non-compliant and obsolete. All three substitute parts address the RoHS compliance gap through ROHS3 certification. The SUD50N024-09P-E3 is the only substitute with Active product status, indicating ongoing manufacturing and supply chain support. For new designs or production requiring regulatory compliance and supply continuity, the SUD50N024-09P-E3 is the optimal selection. For legacy system maintenance where compliance is not mandated, the STMicroelectronics alternatives provide performance advantages.

Frequently Asked Questions (FAQ)

Q: Can the STD100N3LF3 or STD150N3LLH6 be used as direct replacements for the IRLR3715Z?

A: Yes, both STMicroelectronics parts are electrically compatible substitutes. All three devices are N-Channel MOSFETs in TO-252-3 (DPAK) packages with compatible gate threshold voltages and operating temperature ranges. The STD100N3LF3 and STD150N3LLH6 provide higher voltage and current ratings (30V, 80A) compared to the IRLR3715Z (20V, 49A), making them suitable for applications with higher performance margins. No PCB layout modifications are required due to identical package geometry.

Q: What is the primary advantage of the SUD50N024-09P-E3 over the STMicroelectronics alternatives?

A: The SUD50N024-09P-E3 is the only substitute with Active product status, ensuring continued manufacturing and supply availability. Additionally, it provides the closest electrical match to the IRLR3715Z with identical 49A continuous drain current and comparable 22V Vdss rating. For applications requiring long-term supply chain stability and regulatory compliance, the SUD50N024-09P-E3 is the preferred choice.

Q: Are there thermal performance differences between the IRLR3715Z and its substitutes?

A: The IRLR3715Z has a maximum power dissipation of 40W (Tc). The SUD50N024-09P-E3 provides 39.5W (Tc), offering equivalent thermal performance. The STD100N3LF3 and STD150N3LLH6 provide significantly higher power dissipation ratings of 110W (Tc), indicating superior thermal capability. Lower on-state resistance values in the STMicroelectronics parts (5.5 mOhm and 2.8 mOhm respectively, compared to 11 mOhm in the original) result in reduced power loss and improved thermal efficiency in high-current applications.

Q: Does the higher gate charge in the substitute parts affect circuit performance?

A: The IRLR3715Z has a gate charge of 11 nC at 4.5V. The SUD50N024-09P-E3 has 16 nC at 4.5V, representing a 45% increase. The STMicroelectronics parts have higher gate charges of 27 nC and 29 nC respectively. Higher gate charge requires longer switching times and increased gate drive current. Existing gate drive circuits must be evaluated to confirm adequate drive capability. For most standard gate driver ICs, the increased gate charge is within acceptable operating margins.

Q: What is the impact of the higher Vdss ratings in the STMicroelectronics substitutes?

A: The STD100N3LF3 and STD150N3LLH6 are rated for 30V Vdss compared to the IRLR3715Z's 20V. Higher voltage ratings provide additional safety margin against voltage transients and overshoot conditions. These parts are suitable for applications where the original 20V rating is marginal or where system voltage spikes may occur. No circuit modifications are required; the higher voltage rating is a performance enhancement.

Q: Are all substitute parts available in the same packaging options?

A: All substitute parts are available in TO-252-3 (DPAK) surface mount packages, identical to the IRLR3715Z. The SUD50N024-09P-E3 is available in Cut Tape (CT) and Digi-Reel® packaging options. The STMicroelectronics parts are also available in Cut Tape (CT) and Digi-Reel® formats. No alternative package options are specified in the provided data. PCB footprints and land patterns are identical across all parts.

Q: What is the significance of RoHS compliance in selecting a substitute?

A: The IRLR3715Z is RoHS non-compliant, while all three substitutes are ROHS3 compliant. RoHS compliance is mandatory for products sold in the European Union and increasingly required by global OEMs. For new designs, production runs, or systems subject to regulatory requirements, ROHS3-compliant substitutes are necessary. For legacy system maintenance where regulatory compliance is not mandated, RoHS status is not a limiting factor.

Q: Can the IRLR3715Z be used interchangeably with its substitutes in existing designs?

A: Yes, the substitute parts are designed for direct replacement in existing designs. All devices share identical TO-252-3 (DPAK) package geometry, compatible gate threshold voltages, and overlapping operating temperature ranges. No PCB modifications, gate drive circuit changes, or thermal management redesigns are required for basic substitution. However, applications operating at the upper limits of the original IRLR3715Z's specifications (20V, 49A, 40W) should be evaluated to confirm that substitute part characteristics are appropriate for the specific circuit topology and operating conditions.