RFD14N05L Equivalent & Substitute Parts

Part Overview

The RFD14N05L is an N-Channel MOSFET manufactured by onsemi, rated for 50V drain-to-source voltage and 14A continuous drain current in a Through Hole I-PAK (TO-251AA) package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The RFD14N05L serves applications requiring moderate voltage and current switching capabilities with a compact through-hole form factor. Due to its obsolete status, identifying functionally compatible alternatives from active product lines ensures design continuity and supply chain reliability.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	50	V
Continuous Drain Current (Id) @ 25°C	14	A (Tc)
On-Resistance (Rds On) @ 14A, 5V	100	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	2	V
Gate Charge (Qg) @ 10V	40	nC
Power Dissipation (Max)	48	W (Tc)
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	TO-251-3 Short Leads, I-PAK	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution of the RFD14N05L is determined by the following critical parameters:

Voltage Rating: Substitute parts must have a Vdss rating equal to or greater than 50V to maintain voltage margin in the application.

Current Rating: Substitute parts must support continuous drain current (Id) at or above 14A to handle the same load conditions.

On-Resistance (Rds On): Lower on-resistance values improve efficiency and reduce power dissipation. Substitute parts with Rds On at or below 100mOhm at comparable gate drive conditions are preferred.

Gate Threshold Voltage: Substitute parts must have Vgs(th) at or below 2V to ensure compatibility with standard 5V gate drive circuits.

Package and Mounting: All substitute parts must use Through Hole mounting in TO-251AA (I-PAK) package format to maintain PCB compatibility.

Operating Temperature: Substitute parts must support the full -55°C to 175°C operating range or equivalent.

Compliance: RoHS3 compliance is required for new designs; obsolete parts may not meet current regulatory standards.

Parameter Comparison

Parameter	RFD14N05L (Main)	IRLU014PBF	IRLU024NPBF	STD12NF06L-1
Manufacturer	onsemi	Vishay Siliconix	Infineon Technologies	STMicroelectronics
Vdss (V)	50	60	55	60
Id @ 25°C (A)	14	7.7	17	12
Rds On (mOhm)	100 @ 14A, 5V	200 @ 4.6A, 5V	65 @ 10A, 10V	100 @ 6A, 10V
Vgs(th) @ 250µA (V)	2	2	2	2
Gate Charge @ 5V (nC)	40 @ 10V	8.4 @ 5V	15 @ 5V	10 @ 5V
Power Dissipation (W)	48 (Tc)	25 (Tc)	45 (Tc)	42.8 (Tc)
Operating Temperature (°C)	-55 to 175	-55 to 150	-55 to 175	-55 to 175
Package	TO-251AA, I-PAK	TO-251AA	TO-251AA, I-PAK	TO-251AA, I-PAK
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

IRLU024NPBF (Infineon Technologies) is the primary substitute for the RFD14N05L. This device exceeds the original specifications with 17A continuous drain current (versus 14A), 55V Vdss rating, and superior on-resistance of 65mOhm at 10A, 10V. The IRLU024NPBF maintains full operating temperature range (-55°C to 175°C), supports the same TO-251AA package, and carries active product status with ROHS3 compliance. Higher current capability and lower on-resistance provide improved thermal performance and efficiency margins.

STD12NF06L-1 (STMicroelectronics) serves as a secondary substitute when current requirements are less critical. This device provides 12A continuous drain current, 60V Vdss rating, and 100mOhm on-resistance at 10A, 10V. The STD12NF06L-1 maintains full operating temperature range, TO-251AA package compatibility, and ROHS3 compliance. The 12A rating approaches the original 14A specification, making it suitable for applications with moderate current headroom.

IRLU014PBF (Vishay Siliconix) is not recommended as a primary substitute. Although it provides 60V Vdss and compatible gate characteristics, the 7.7A continuous drain current falls significantly below the 14A requirement of the RFD14N05L. The maximum operating temperature of 150°C also limits use in high-temperature applications. This part is suitable only for designs where current requirements have been reduced or where thermal constraints permit lower current operation.

All substitute parts are active products with current manufacturing support and regulatory compliance, ensuring long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can the IRLU014PBF directly replace the RFD14N05L in all applications?

A: No. The IRLU014PBF provides only 7.7A continuous drain current, which is insufficient for applications requiring the full 14A capability of the RFD14N05L. Additionally, the maximum operating temperature of 150°C restricts use in high-temperature environments. The IRLU014PBF is suitable only for applications where current requirements have been reduced or thermal constraints permit lower current operation.

Q: What are the primary advantages of the IRLU024NPBF as a substitute?

A: The IRLU024NPBF exceeds the RFD14N05L specifications in three critical areas: continuous drain current (17A versus 14A), on-resistance (65mOhm versus 100mOhm), and power dissipation capability (45W versus 48W). These improvements provide enhanced thermal performance, reduced power loss, and greater design margin. The device maintains full operating temperature range and TO-251AA package compatibility.

Q: Are all substitute parts compatible with the same PCB layout?

A: Yes. All substitute parts use the TO-251AA (I-PAK) through-hole package with identical pin configuration and lead spacing. Direct PCB compatibility is maintained without layout modifications. However, thermal management considerations may differ due to variations in power dissipation and on-resistance characteristics.

Q: What is the impact of different on-resistance values on circuit performance?

A: On-resistance directly affects power dissipation and thermal performance. Lower on-resistance reduces I²R losses during conduction. The IRLU024NPBF (65mOhm) dissipates less heat than the RFD14N05L (100mOhm) at equivalent current levels, improving efficiency and reducing thermal stress on the device and surrounding components.

Q: Do all substitute parts meet current regulatory compliance standards?

A: Yes. All substitute parts carry ROHS3 compliance certification, meeting current environmental and regulatory requirements. The RFD14N05L, while ROHS3 compliant, is obsolete and may face supply constraints. Active substitute parts ensure ongoing availability and compliance with evolving regulatory standards.

Q: What gate drive voltage is required for the substitute parts?

A: All substitute parts, including the RFD14N05L, have a gate threshold voltage (Vgs(th)) of 2V at 250µA, ensuring compatibility with standard 5V gate drive circuits. The IRLU024NPBF supports gate voltages up to ±16V, while the STD12NF06L-1 also supports ±16V, providing additional design flexibility compared to the original ±10V rating.

Q: Can the STD12NF06L-1 be used in applications requiring the full 14A current rating?

A: The STD12NF06L-1 provides 12A continuous drain current, which is approximately 86% of the RFD14N05L specification. Use in 14A applications requires verification that actual circuit current does not exceed 12A under all operating conditions, including transient and fault scenarios. For applications requiring the full 14A capability, the IRLU024NPBF is the recommended substitute.

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