IRLR120ATF N-Channel MOSFET 100V 8.4A DPAK Equivalent & Substitute Parts

Part Overview

The IRLR120ATF is an N-Channel metal oxide semiconductor field-effect transistor (MOSFET) manufactured by onsemi, rated for 100V drain-to-source voltage and 8.4A continuous drain current in a surface mount TO-252AA (DPAK) package. This device is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement.

The IRLR120ATF serves in switching and amplification applications requiring moderate voltage and current handling in compact surface mount form factors. Due to its obsolete status, equivalent substitute parts with matching or superior electrical characteristics and identical packaging are required to maintain design continuity and ensure component availability.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	100	V
Continuous Drain Current (Id) @ 25°C	8.4	A (Tc)
On-State Resistance (Rds On) @ 4.2A, 5V	220	mOhm
Gate-Source Threshold Voltage (Vgs(th)) @ 250µA	2	V
Gate Charge (Qg) @ 5V	15	nC
Input Capacitance (Ciss) @ 25V	440	pF
Power Dissipation (Max)	2.5 (Ta), 35 (Tc)	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package Type	TO-252-3 DPAK	Surface Mount
Moisture Sensitivity Level (MSL)	1	Unlimited

Substitute Part Grouping Explanation

Substitution of the IRLR120ATF is determined by the following critical electrical and mechanical parameters:

Primary Matching Criteria:

Drain-to-Source Voltage (Vdss): 100V minimum
Continuous Drain Current (Id): 8.4A or greater
Package Type: TO-252-3 DPAK (identical mechanical footprint)
Mounting Type: Surface Mount
Moisture Sensitivity Level: MSL 1 (Unlimited)

Secondary Compatibility Factors:

Gate-Source Threshold Voltage (Vgs(th)): 2V to 4V range
On-State Resistance (Rds On): 220mOhm or lower preferred for thermal performance
Operating Temperature Range: Minimum -55°C to 150°C
Gate Charge (Qg): Lower values reduce switching losses

Substitute parts must maintain electrical performance within the application's design margins while preserving identical package geometry for direct PCB replacement without layout modification.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Vgs(th) (V)	Qg (nC)	Ciss (pF)	Tj Range (°C)	Package	Status
IRLR120ATF	onsemi	100	8.4 (Tc)	220 @ 4.2A, 5V	2 @ 250µA	15 @ 5V	440 @ 25V	-55 to 150	TO-252AA DPAK	Obsolete
IRLR120NTRPBF	Infineon Technologies	100	10 (Tc)	185 @ 6A, 10V	2 @ 250µA	20 @ 5V	440 @ 25V	-55 to 175	TO-252AA DPAK	Active
IRLR120TRLPBF	Vishay Siliconix	100	7.7 (Tc)	270 @ 4.6A, 5V	2 @ 250µA	12 @ 5V	490 @ 25V	-55 to 150	TO-252-3 DPAK	Active
IRLR120TRPBF	Vishay Siliconix	100	7.7 (Tc)	270 @ 4.6A, 5V	2 @ 250µA	12 @ 5V	490 @ 25V	-55 to 150	TO-252-3 DPAK	Active
IRLR120	Vishay Siliconix	100	7.7 (Tc)	270 @ 4.6A, 5V	2 @ 250µA	12 @ 5V	490 @ 25V	-55 to 150	TO-252-3 DPAK	Active
IRLR120PBF	Vishay Siliconix	100	7.7 (Tc)	270 @ 4.6A, 5V	2 @ 250µA	12 @ 5V	490 @ 25V	-55 to 150	TO-252-3 DPAK	Active
IRLR120TRL	Vishay Siliconix	100	7.7 (Tc)	270 @ 4.6A, 5V	2 @ 250µA	12 @ 5V	490 @ 25V	-55 to 150	TO-252-3 DPAK	Active
IRLR120TRR	Vishay Siliconix	100	7.7 (Tc)	270 @ 4.6A, 5V	2 @ 250µA	12 @ 5V	490 @ 25V	-55 to 150	TO-252-3 DPAK	Active
IRLR120TRRPBF	Vishay Siliconix	100	7.7 (Tc)	270 @ 4.6A, 5V	2 @ 250µA	12 @ 5V	490 @ 25V	-55 to 150	TO-252-3 DPAK	Active
BUK7275-100A,118	Nexperia USA Inc.	100	21.7 (Tc)	75 @ 13A, 10V	4 @ 1mA	N/A	1210 @ 25V	-55 to 175	TO-252-3 DPAK	Obsolete
AOD4504	Alpha & Omega Semiconductor Inc.	200	6 (Tc)	400 @ 3A, 10V	3.7 @ 250µA	115 @ 10V	328 @ 100V	-55 to 175	TO-252 DPAK	Active

Engineering Selection Recommendations

Primary Substitute: IRLR120NTRPBF (Infineon Technologies)

The IRLR120NTRPBF is the preferred direct substitute for the obsolete IRLR120ATF. This device maintains identical 100V Vdss rating and exceeds the 8.4A continuous drain current requirement with 10A capability. The IRLR120NTRPBF features superior on-state resistance (185mOhm versus 220mOhm), reducing thermal dissipation in switching applications. The extended operating temperature range (-55°C to 175°C) provides additional thermal margin. This part is actively manufactured, ROHS3 compliant, and available in high inventory quantities (37,310 units). The TO-252AA DPAK package ensures direct PCB compatibility without layout modification.

Secondary Substitutes: IRLR120 Series (Vishay Siliconix)

The IRLR120TRLPBF, IRLR120TRPBF, IRLR120, IRLR120PBF, IRLR120TRL, IRLR120TRR, and IRLR120TRRPBF represent functionally equivalent alternatives from Vishay Siliconix. These devices share identical 100V Vdss and 2V Vgs(th) specifications. The continuous drain current rating of 7.7A is marginally lower than the IRLR120ATF's 8.4A specification; however, this difference remains within acceptable design margins for most applications. On-state resistance is slightly higher at 270mOhm. All variants are actively manufactured with ROHS3 compliance (except IRLR120 and IRLR120TRL, which are RoHS non-compliant). These parts are available in multiple packaging formats (Tape & Reel, Tube, standard) to accommodate procurement requirements.

Alternative for Higher Current Applications: BUK7275-100A,118 (Nexperia USA Inc.)

The BUK7275-100A,118 provides significantly enhanced current handling capability at 21.7A continuous drain current with superior on-state resistance (75mOhm). This device is suitable for applications requiring higher current capacity while maintaining the 100V Vdss rating. The extended temperature range (-55°C to 175°C) and automotive qualification (AEC-Q101) provide additional design flexibility. However, this part is classified as obsolete, limiting its long-term availability.

Not Recommended: AOD4504 (Alpha & Omega Semiconductor Inc.)

The AOD4504 features a higher 200V Vdss rating and reduced continuous drain current (6A at Tc), making it unsuitable as a direct substitute for the IRLR120ATF. The elevated gate threshold voltage (3.7V versus 2V) and significantly higher gate charge (115nC versus 15nC) result in different switching characteristics and increased drive requirements. This device is appropriate only for applications requiring higher voltage operation.

Frequently Asked Questions (FAQ)

Q: Can the IRLR120NTRPBF directly replace the IRLR120ATF without PCB modification?

A: Yes. Both devices utilize the TO-252AA DPAK package with identical pin configuration and mechanical footprint. Direct PCB replacement is possible without layout changes. The IRLR120NTRPBF's superior electrical characteristics (higher current rating, lower on-state resistance) ensure functional compatibility.

Q: What is the significance of the 7.7A versus 8.4A continuous drain current difference in Vishay IRLR120 variants?

A: The 7.7A rating in Vishay IRLR120 variants represents a 0.7A reduction from the IRLR120ATF specification. For applications operating at or near the 8.4A limit, this difference may require thermal analysis to confirm adequate margin. Applications operating below 7.7A continuous current experience no functional impact.

Q: Are all IRLR120 variants from Vishay electrically interchangeable?

A: Yes. IRLR120, IRLR120PBF, IRLR120TRL, IRLR120TRR, IRLR120TRLPBF, IRLR120TRPBF, and IRLR120TRRPBF share identical electrical specifications. Differences exist only in packaging format (bulk, tube, tape & reel) and RoHS compliance status. Selection depends on procurement requirements and supply chain preferences.

Q: Why is the BUK7275-100A,118 listed as a substitute if it is also obsolete?

A: The BUK7275-100A,118 is included for reference as a functionally superior alternative for applications requiring higher current capacity. Its obsolete status limits practical utility for new designs; however, existing inventory may support legacy system maintenance.

Q: What packaging options are available for IRLR120 substitutes?

A: Vishay IRLR120 variants are available in three packaging formats: standard (IRLR120), tube (IRLR120PBF), and tape & reel (IRLR120TRL, IRLR120TRR, IRLR120TRLPBF, IRLR120TRPBF, IRLR120TRRPBF). Selection depends on manufacturing process requirements and volume considerations. All maintain identical TO-252-3 DPAK mechanical specifications.

Q: Does the IRLR120NTRPBF require different gate drive voltage than the IRLR120ATF?

A: The IRLR120NTRPBF supports gate drive voltages of 4V and 10V, compared to the IRLR120ATF's 5V specification. Both devices maintain the same 2V gate threshold voltage. Existing 5V gate drive circuits are fully compatible with the IRLR120NTRPBF without modification.

Q: What is the impact of the 185mOhm versus 220mOhm on-state resistance difference?

A: The IRLR120NTRPBF's lower on-state resistance (185mOhm) reduces conduction losses and heat dissipation compared to the IRLR120ATF (220mOhm). At 8.4A continuous current, this represents approximately 7.4W versus 15.5W power dissipation, resulting in improved thermal performance and reduced cooling requirements.

Q: Is RoHS compliance a critical factor in selecting a substitute?

A: RoHS compliance status depends on application requirements and regulatory jurisdiction. The IRLR120NTRPBF and most Vishay IRLR120 variants (IRLR120TRLPBF, IRLR120TRPBF, IRLR120TRRPBF, IRLR120PBF) are ROHS3 compliant. IRLR120, IRLR120TRL, and IRLR120TRR are RoHS non-compliant. Selection should align with end-product compliance obligations.

Q: Can the AOD4504 be used in applications where higher voltage tolerance is beneficial?

A: The AOD4504's 200V Vdss rating provides voltage margin for applications with transient overvoltage conditions. However, its 6A continuous current rating and different gate characteristics make it unsuitable as a direct functional replacement for the IRLR120ATF. Use of the AOD4504 requires complete circuit redesign and thermal re-analysis.

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