IRLR3114ZPBF N-Channel MOSFET 40V 42A Equivalent & Substitute Parts

Part Overview

The IRLR3114ZPBF is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 40V drain-to-source voltage and 42A continuous drain current in a surface mount DPAK package. This device is part of the HEXFET® series and is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent substitute components for ongoing design support and procurement.

The primary reason for identifying substitutes is the discontinued product status. Alternative parts must maintain electrical compatibility within the specified voltage and current operating ranges while preserving the same mechanical package format.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	40	V
Continuous Drain Current (Id) @ 25°C	42	A
On-State Resistance (Rds On) @ 42A, 10V	4.9	mOhm
Gate Threshold Voltage (Vgs(th)) @ 100µA	2.5	V
Power Dissipation (Max)	140	W
Operating Temperature Range	-55 to 175	°C
Package Type	TO-252-3 DPAK	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution eligibility for the IRLR3114ZPBF is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Drain-to-Source Voltage (Vdss): Must equal or exceed 40V
Package Type: Must be TO-252-3 DPAK (2 Leads + Tab, SC-63)
Mounting Type: Must be Surface Mount
FET Type: Must be N-Channel MOSFET

Performance Criteria:

Continuous Drain Current (Id): Must support minimum 42A operation
On-State Resistance (Rds On): Lower or equal values indicate improved performance
Operating Temperature Range: Must encompass -55°C to 175°C

Compliance Criteria:

RoHS3 Compliance: Required
Moisture Sensitivity Level: MSL 1 (Unlimited) preferred

The substitute parts identified below meet all mandatory compatibility criteria and maintain electrical performance within acceptable operating parameters for direct replacement applications.

Parameter Comparison

Parameter	IRLR3114ZPBF (Main)	STD120N4LF6	STD86N3LH5	STD95N4F3	STD95N4LF3	Unit
Manufacturer	Infineon	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics	—
Vdss	40	40	30	40	40	V
Id @ 25°C	42	80	80	80	80	A
Rds On (Max) @ 10V	4.9	4.0	5.0	6.5	6.0	mOhm
Vgs(th) (Max)	2.5	3.0	2.5	4.0	2.5	V
Power Dissipation (Max)	140	110	70	110	110	W
Operating Temperature	-55 to 175	-55 to 175	to 175	-55 to 175	-55 to 175	°C
Package	TO-252-3 DPAK	DPAK	DPAK	DPAK	DPAK	—
Product Status	Discontinued	Active	Active	Active	Active	—
RoHS3 Compliance	Yes	Yes	Yes	Yes	Yes	—

Engineering Selection Recommendations

Primary Substitute: STD120N4LF6

The STD120N4LF6 is the recommended primary substitute. It maintains 40V Vdss rating, exceeds the 42A current requirement with 80A capability, and delivers superior on-state resistance (4.0 mOhm vs. 4.9 mOhm). The part is active in production with AEC-Q101 automotive qualification, ensuring long-term availability and supply chain stability. RoHS3 compliance and identical DPAK packaging enable direct board-level replacement.

Secondary Substitute: STD95N4LF3

The STD95N4LF3 provides equivalent 40V Vdss and 80A current rating with acceptable on-state resistance (6.0 mOhm). This part maintains the 2.5V gate threshold voltage matching the original design, reducing potential gate drive circuit modifications. Active production status and full temperature range support (-55°C to 175°C) confirm compatibility.

Alternative Substitute: STD95N4F3

The STD95N4F3 offers 40V Vdss and 80A current capability in the same DPAK package. Higher gate threshold voltage (4.0V) may require gate drive circuit evaluation in applications with marginal drive voltage margins. Active production status supports long-term procurement.

Not Recommended: STD86N3LH5

The STD86N3LH5 operates at reduced 30V Vdss rating, which is below the 40V specification of the original part. This voltage derating restricts application scope and is unsuitable for designs requiring full 40V operation. Although this part features automotive qualification, the voltage limitation disqualifies it as a direct substitute.

Frequently Asked Questions (FAQ)

Q: Can STD120N4LF6 be used as a direct replacement for IRLR3114ZPBF?

A: Yes. Both parts share identical 40V Vdss rating, DPAK surface mount package, and -55°C to 175°C operating temperature range. The STD120N4LF6 exceeds the 42A current requirement and delivers lower on-state resistance, making it electrically superior for direct board-level substitution without circuit modifications.

Q: What is the significance of the higher current rating (80A) in substitute parts?

A: The substitute parts are rated for 80A continuous drain current, compared to 42A for the original IRLR3114ZPBF. This higher rating provides design margin and thermal headroom in applications operating near the original current limit. The parts remain fully compatible at 42A operation.

Q: Why is STD86N3LH5 not recommended despite automotive qualification?

A: The STD86N3LH5 is rated for 30V Vdss, which is 10V below the 40V specification of the IRLR3114ZPBF. This voltage derating makes it unsuitable for applications requiring full 40V operation. Substitution would require circuit redesign to operate within reduced voltage margins.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All identified substitute parts (STD120N4LF6, STD86N3LH5, STD95N4F3, STD95N4LF3) carry RoHS3 compliance certification, matching the environmental compliance status of the original IRLR3114ZPBF.

Q: Do substitute parts require PCB layout modifications?

A: No. All substitute parts use identical TO-252-3 DPAK packaging with the same pin configuration and thermal tab design. Existing PCB layouts require no modification for mechanical or thermal accommodation.

Q: What is the difference between STD95N4F3 and STD95N4LF3?

A: Both parts share 40V Vdss, 80A current rating, and DPAK packaging. The primary difference is gate threshold voltage: STD95N4F3 specifies 4.0V maximum, while STD95N4LF3 specifies 2.5V maximum. The STD95N4LF3 more closely matches the original 2.5V threshold, potentially reducing gate drive circuit evaluation requirements.

Q: Is automotive qualification (AEC-Q101) required for my application?

A: Automotive qualification is not mandatory for all applications. STD120N4LF6 and STD86N3LH5 carry AEC-Q101 certification, while STD95N4F3 and STD95N4LF3 do not. Select based on application requirements and supply chain preferences.

Q: What is the inventory status of substitute parts?

A: STD95N4F3 has the highest inventory (20,200 pcs), followed by STD86N3LH5 (18,895 pcs), STD120N4LF6 (1,300 pcs), and STD95N4LF3 (5,210 pcs). Availability may vary by distributor and time of inquiry.

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