NDP4050 Equivalent & Substitute Parts

Part Overview

The NDP4050 is an N-Channel MOSFET manufactured by onsemi, rated for 50V drain-to-source voltage and 15A continuous drain current in a Through Hole TO-220-3 package. This device is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support and procurement continuity. The NDP4050 serves applications requiring moderate voltage and current switching capabilities in standard through-hole form factors.

Substiute Parts

NDP4050

onsemiIn Stock: 729NDP4050 Datasheet

Current PartRFQ

IRFZ20PBF

Vishay SiliconixIn Stock: 15168IRFZ20PBF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the NDP4050 is based on electrical and mechanical parameter equivalence within the N-Channel MOSFET category. The following parameters establish substitution validity:

Critical Matching Parameters:

• FET Type: N-Channel (functional polarity requirement)
• Drain to Source Voltage (Vdss): 50 V (voltage rating must equal or exceed)
• Current - Continuous Drain (Id) @ 25°C: 15A (Tc) (current capacity must equal or exceed)
• Gate Threshold Voltage (Vgs(th)): 4V @ 250µA (gate drive compatibility)
• Package / Case: TO-220-3 or compatible TO-220 variant (mechanical and thermal interface)

Secondary Compatibility Parameters:

• Rds On (Max): 100mOhm specification (on-state performance)
• Gate Charge (Qg): 17 nC @ 10 V (switching speed and drive requirements)
• Input Capacitance (Ciss): Comparable range (circuit timing considerations)

The IRFZ20PBF meets all critical matching parameters and is classified as an active product with current manufacturing support and RoHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

The IRFZ20PBF is a direct electrical substitute for the NDP4050 based on matched voltage, current, and gate drive specifications. Selection of the IRFZ20PBF provides the following advantages:

Product Status Consideration: The NDP4050 is obsolete, whereas the IRFZ20PBF is an active product with ongoing manufacturing support and availability. This ensures long-term procurement reliability and design continuity.

Compliance Status: The IRFZ20PBF is RoHS3 compliant, addressing regulatory requirements for new designs and manufacturing environments. The NDP4050 is RoHS non-compliant, which may restrict use in certain applications or regions.

Electrical Equivalence: Both devices share identical Vdss (50V), Id (15A), Vgs(th) (4V @ 250µA), and Qg (17 nC @ 10V) specifications. The IRFZ20PBF exhibits higher input capacitance (850 pF versus 450 pF), which may require circuit timing evaluation in high-frequency switching applications but does not prevent functional substitution.

Package Compatibility: Both devices use TO-220 through-hole packages. The NDP4050 uses TO-220-3 and the IRFZ20PBF uses TO-220AB, which are mechanically and thermally compatible for standard PCB layouts and heat sink mounting.

Frequently Asked Questions (FAQ)

Q: Can the IRFZ20PBF directly replace the NDP4050 in existing designs?

A: Yes. The IRFZ20PBF meets all critical electrical parameters: 50V Vdss, 15A continuous drain current, 4V gate threshold voltage, and 17 nC gate charge. Both devices use compatible TO-220 through-hole packages. Pin configuration and thermal characteristics are compatible with standard TO-220 mounting practices.

Q: What is the difference between TO-220-3 and TO-220AB packaging?

A: Both are TO-220 through-hole packages with three leads (Gate, Drain, Source). TO-220-3 and TO-220AB refer to variant designations from different manufacturers but maintain identical pin spacing, lead configuration, and PCB footprint compatibility. Both are suitable for standard TO-220 heat sink mounting.

Q: Does the higher input capacitance of the IRFZ20PBF (850 pF vs. 450 pF) affect circuit performance?

A: Input capacitance affects gate drive current requirements and switching speed. The IRFZ20PBF requires higher gate charge delivery but maintains the same 17 nC total gate charge specification. Circuit evaluation is necessary only if the design operates at switching frequencies above 1 MHz or uses current-limited gate drive circuits.

Q: Why is the NDP4050 obsolete?

A: The NDP4050 is classified as obsolete by onsemi. The IRFZ20PBF is an active product from Vishay Siliconix with current manufacturing support, making it the appropriate choice for new designs and ongoing procurement.

Q: Are there any compliance differences between the two devices?

A: Yes. The IRFZ20PBF is RoHS3 compliant, whereas the NDP4050 is RoHS non-compliant. For applications subject to RoHS regulations or environmental compliance requirements, the IRFZ20PBF is the required choice.

Q: What is the Rds On difference between the two devices?

A: Both devices specify 100mOhm maximum Rds On at 10V gate voltage. The NDP4050 specifies this at 7.5A drain current, while the IRFZ20PBF specifies it at 10A drain current. This difference reflects manufacturer test conditions but does not affect functional equivalence at the 15A rated current.