AOD3C50 N-Channel MOSFET 500V 3A Equivalent & Substitute Parts

Part Overview

The AOD3C50 is an N-Channel MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 500V drain-to-source voltage with 3A continuous drain current in a surface mount TO-252 (DPAK) package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The AOD3C50 operates across a temperature range of -55°C to 150°C (TJ) and dissipates up to 83W at the case temperature. It features a maximum on-resistance of 1.4Ω at 2.2A and 10V gate-source voltage, with a gate threshold voltage of 5V at 250µA. The part is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Substiute Parts

AOD3C50

Alpha & Omega Semiconductor Inc.In Stock: 3690AOD3C50 Datasheet

Current PartRFQ

IRFR320PBF

Vishay SiliconixIn Stock: 5344IRFR320PBF Datasheet

MFR RecommendedRFQ

IRFR320TRLPBF

Vishay SiliconixIn Stock: 1152IRFR320TRLPBF Datasheet

MFR RecommendedRFQ

IRFR430ATRPBF

Vishay SiliconixIn Stock: 1830IRFR430ATRPBF Datasheet

MFR RecommendedRFQ

STD5NK40ZT4

STMicroelectronicsIn Stock: 17956STD5NK40ZT4 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AOD3C50 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Drain-to-Source Voltage (Vdss): Must equal or exceed 500V
• Continuous Drain Current (Id): Must equal or exceed 3A at 25°C
• Package Type: Must be TO-252-3 (DPAK) surface mount
• FET Type: Must be N-Channel MOSFET
• Operating Temperature Range: Must support -55°C to 150°C (TJ)
• Gate-Source Voltage (Vgs Max): Must support ±30V or greater

Secondary Compatibility Parameters:

• On-Resistance (Rds On): Lower values indicate improved performance
• Gate Charge (Qg): Lower values reduce switching losses
• Input Capacitance (Ciss): Lower values reduce gate drive requirements
• Power Dissipation: Higher ratings provide design margin

The substitute parts identified below meet or exceed the primary criteria, ensuring functional compatibility in applications designed for the AOD3C50.

Parameter Comparison

Engineering Selection Recommendations

IRFR430ATRPBF (Vishay Siliconix)

The IRFR430ATRPBF is the primary substitute for the AOD3C50. It matches the 500V Vdss rating and exceeds the 3A current requirement with 5A continuous drain current. The device maintains the same operating temperature range (-55°C to 150°C) and TO-252-3 (DPAK) package. With 110W power dissipation capability, it provides superior thermal performance compared to the original 83W rating. The part is active in production status with ROHS3 compliance. Gate-source voltage rating of ±30V matches the original specification. This part is supplied in Cut Tape (CT) & Digi-Reel® packaging with 1800 pieces in stock.

STD5NK40ZT4 (STMicroelectronics)

The STD5NK40ZT4 serves as an alternative substitute with a 400V Vdss rating. While this represents a 100V reduction from the original 500V specification, it maintains the 3A continuous drain current and identical operating temperature range. The part features lower gate charge (17 nC) and input capacitance (305 pF) compared to the AOD3C50, resulting in improved switching performance. It is active in production with ROHS3 compliance and REACH unaffected status. The SuperMESH™ technology provides enhanced efficiency. This part is supplied in Cut Tape (CT) & Digi-Reel® packaging with 17910 pieces in stock, offering the highest availability.

IRFR320PBF and IRFR320TRLPBF (Vishay Siliconix)

Both IRFR320 variants operate at 400V Vdss with 3.1A continuous drain current. These parts are suitable for applications where the 500V rating is not required. The IRFR320PBF is supplied in Tube packaging (5317 pieces in stock), while the IRFR320TRLPBF is supplied in Tape & Reel (TR) packaging (1090 pieces in stock). Both maintain the TO-252-3 (DPAK) package and -55°C to 150°C operating temperature range. Gate-source voltage is limited to ±20V, which is lower than the original ±30V specification. Both parts are active in production with ROHS3 compliance.

Selection Basis:

• Full Voltage Compatibility: IRFR430ATRPBF is recommended for applications requiring the full 500V rating.
• Cost and Availability: STD5NK40ZT4 offers the highest stock availability (17910 pieces) for applications tolerating 400V operation.
• Packaging Preference: IRFR320PBF (Tube) or IRFR320TRLPBF (Tape & Reel) for 400V applications with specific packaging requirements.

All substitute parts are active in production status, ensuring long-term availability and supply chain stability compared to the obsolete AOD3C50.

Frequently Asked Questions (FAQ)

Q: Can the IRFR320PBF or IRFR320TRLPBF directly replace the AOD3C50 in all applications?

A: The IRFR320 variants operate at 400V Vdss compared to the AOD3C50's 500V rating. Direct substitution is valid only for applications where the maximum operating voltage does not exceed 400V. If the circuit design requires 500V capability, the IRFR430ATRPBF is the appropriate substitute.

Q: What is the difference between IRFR320PBF and IRFR320TRLPBF?

A: Both parts are electrically identical N-Channel MOSFETs with 400V Vdss and 3.1A continuous drain current. The primary difference is packaging: IRFR320PBF is supplied in Tube packaging, while IRFR320TRLPBF is supplied in Tape & Reel (TR) format. Selection depends on assembly process requirements and volume needs.

Q: Why does the STD5NK40ZT4 have lower gate charge than the AOD3C50?

A: The STD5NK40ZT4 uses STMicroelectronics' SuperMESH™ technology, which optimizes the internal structure for reduced gate charge (17 nC versus 25 nC). This results in lower switching losses and faster switching transitions, benefiting high-frequency applications.

Q: Is the IRFR430ATRPBF suitable for all AOD3C50 applications?

A: Yes. The IRFR430ATRPBF exceeds or matches all critical parameters: 500V Vdss (equal), 5A continuous drain current (exceeds 3A requirement), ±30V Vgs Max (equal), -55°C to 150°C operating range (equal), and TO-252-3 (DPAK) package (identical). The higher power dissipation rating (110W versus 83W) provides additional thermal margin.

Q: What is the impact of the lower Vgs Max (±20V) on the IRFR320 variants compared to the AOD3C50 (±30V)?

A: The IRFR320 variants limit gate-source voltage to ±20V. If the circuit applies gate voltages exceeding ±20V, the IRFR320 parts are not suitable. For applications using standard gate drive voltages (typically ±10V to ±15V), this limitation does not affect operation.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All identified substitute parts (IRFR320PBF, IRFR320TRLPBF, IRFR430ATRPBF, and STD5NK40ZT4) are ROHS3 compliant, matching the compliance status of the original AOD3C50.

Q: Which substitute part offers the best availability?

A: The STD5NK40ZT4 has the highest inventory level with 17910 pieces in stock. This part is suitable for applications tolerating 400V operation and offers the most reliable long-term supply.

Q: Can the AOD3C50 be used interchangeably with the IRFR430ATRPBF in existing designs?

A: Yes, with design verification. The IRFR430ATRPBF meets or exceeds all electrical specifications of the AOD3C50 and uses the identical TO-252-3 (DPAK) package. Pin-to-pin compatibility is confirmed. However, the improved performance characteristics (lower Rds On, higher current rating, higher power dissipation) should be verified to ensure they do not introduce unintended circuit behavior.

Q: What is the moisture sensitivity level (MSL) for all substitute parts?

A: All substitute parts, including the AOD3C50, have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage and handling.