IXTP55N075T N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The IXTP55N075T is an N-Channel MOSFET manufactured by IXYS, rated for 75V drain-to-source voltage with 55A continuous drain current in a TO-220-3 through-hole package. This device is classified as obsolete, necessitating identification of equivalent substitute components for ongoing production and maintenance applications. Substitute parts must maintain functional compatibility across critical electrical parameters including voltage rating, current capacity, on-resistance characteristics, and thermal performance while preserving the through-hole TO-220 form factor.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	75	V
Continuous Drain Current (Id) @ 25°C	55	A
On-Resistance (Rds On Max) @ 27.5A, 10V	19.5	mOhm
Gate Threshold Voltage (Vgs(th) Max) @ 25µA	4	V
Gate Charge (Qg Max) @ 10V	33	nC
Power Dissipation (Max)	130	W
Operating Temperature Range	-55 to 175	°C
Package Type	TO-220-3	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution eligibility for the IXTP55N075T is determined by the following critical parameters:

Voltage Rating Compatibility: Substitute parts must have a Vdss rating equal to or greater than 75V to ensure safe operation under maximum rated conditions. Parts with lower voltage ratings (60V, 55V) operate at reduced voltage margins and are classified as functional substitutes only for applications operating below their rated voltage ceiling.

Current Capacity: Substitute parts must support continuous drain current (Id) at or above 55A to maintain equivalent current-handling capability. Devices rated below 55A represent reduced-capacity alternatives.

On-Resistance (Rds On): Lower on-resistance values indicate superior switching efficiency and reduced power dissipation. The IXTP55N075T specifies 19.5 mOhm maximum at 27.5A, 10V. Substitute parts with comparable or lower Rds On values maintain thermal performance equivalence.

Package and Mounting: All substitute parts must use TO-220-3 through-hole packaging to ensure mechanical and thermal interface compatibility with existing PCB designs and heat sink mounting arrangements.

Operating Temperature Range: All candidates maintain the -55°C to 175°C operating range, ensuring thermal envelope compatibility.

Compliance and Status: RoHS3 compliance and REACH unaffected status are maintained across all substitute options.

Parameter Comparison

Parameter	IXTP55N075T	IRFZ46NPBF	IRFZ44VPBF	IRFZ44NPBF	IRFZ44EPBF	IRLZ44NPBF
Manufacturer	IXYS	Infineon	Infineon	Infineon	Infineon	Infineon
Vdss (V)	75	55	60	55	60	55
Id @ 25°C (A)	55	53	55	49	48	47
Rds On Max (mOhm)	19.5	16.5	16.5	17.5	23	22
Rds On Test Conditions	@ 27.5A, 10V	@ 28A, 10V	@ 31A, 10V	@ 25A, 10V	@ 29A, 10V	@ 25A, 10V
Vgs(th) Max (V)	4	4	4	4	4	2
Gate Charge Qg Max (nC)	33	72	67	63	60	48
Power Dissipation Max (W)	130	107	115	94	110	110
Operating Temperature (°C)	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175
Package	TO-220-3	TO-220AB	TO-220AB	TO-220AB	TO-220AB	TO-220AB
Product Status	Obsolete	Not For New Designs	Not For New Designs	Active	Not For New Designs	Active
RoHS3 Compliant	Yes	Yes	Yes	Yes	Yes	Yes

Engineering Selection Recommendations

Primary Recommendation: IRFZ44NPBF

The IRFZ44NPBF is the preferred substitute for the IXTP55N075T in new designs and ongoing production. This device carries Active product status, ensuring long-term availability and manufacturing support. The IRFZ44NPBF operates at 55V Vdss with 49A continuous drain current, representing a functional substitute for applications operating below the original 75V rating. On-resistance of 17.5 mOhm at 25A, 10V provides efficient switching performance. Gate charge of 63 nC and input capacitance of 1470 pF are within acceptable ranges for most switching applications. RoHS3 compliance and REACH unaffected status confirm regulatory alignment.

Secondary Recommendation: IRLZ44NPBF

The IRLZ44NPBF offers an alternative with Active product status and superior gate charge characteristics (48 nC at 5V). This device features a lower gate threshold voltage of 2V, enabling operation with reduced gate drive voltage. The 55V Vdss and 47A continuous drain current provide functional substitution for reduced-voltage applications. On-resistance of 22 mOhm at 25A, 10V is acceptable for applications where switching frequency and thermal management are not critical constraints. RoHS3 compliance and REACH unaffected status are maintained.

Voltage-Rated Alternative: IRFZ44VPBF

The IRFZ44VPBF provides 60V Vdss rating, offering improved voltage margin over the 55V alternatives while remaining below the original 75V specification. Continuous drain current of 55A matches the original device exactly. On-resistance of 16.5 mOhm at 31A, 10V delivers superior efficiency. Power dissipation of 115W approaches the original 130W rating. However, this device carries Not For New Designs status, limiting its suitability for new production. Existing inventory of 20,534 units supports legacy system maintenance.

Not Recommended for New Designs: IRFZ44EPBF and IRFZ46NPBF

Both IRFZ44EPBF and IRFZ46NPBF carry Not For New Designs status. IRFZ44EPBF operates at 60V with 48A current capacity and 23 mOhm on-resistance, representing reduced performance. IRFZ46NPBF provides 55V, 53A, and 16.5 mOhm characteristics but lacks long-term availability assurance. These devices are suitable only for replacement in existing systems where supply continuity is not a concern.

Frequently Asked Questions (FAQ)

Q: Can the IRFZ44NPBF directly replace the IXTP55N075T in all applications?

A: The IRFZ44NPBF is a functional substitute for applications operating at or below 55V. The original IXTP55N075T is rated for 75V operation. Applications requiring the full 75V rating must use IRFZ44VPBF (60V) as the closest alternative, though this still represents a reduced voltage margin. Circuit analysis is required to confirm compatibility with the lower voltage rating.

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

A: TO-220-3 and TO-220AB are equivalent three-lead through-hole packages with identical pin configurations, lead spacing, and thermal interface characteristics. Both packages are mechanically and electrically interchangeable for PCB mounting and heat sink attachment. The designations reflect different manufacturer nomenclature conventions.

Q: Why do substitute parts have higher gate charge values than the original IXTP55N075T?

A: Gate charge (Qg) varies with device geometry and manufacturing process. The IXTP55N075T specifies 33 nC at 10V, while substitute parts range from 48 to 72 nC. Higher gate charge requires increased gate drive current and switching time but does not prevent functional substitution. Gate driver circuits must be verified to supply adequate current for the substitute device's gate charge specification.

Q: Is the IRLZ44NPBF suitable for high-frequency switching applications?

A: The IRLZ44NPBF features lower gate charge (48 nC at 5V) compared to other substitutes, enabling faster switching transitions. However, on-resistance of 22 mOhm is higher than alternatives, resulting in increased conduction losses. Suitability depends on the specific frequency range and thermal budget of the application. Comparative analysis of switching losses versus conduction losses is required.

Q: Can I use IRFZ44EPBF in a 75V application?

A: No. The IRFZ44EPBF is rated for 60V maximum Vdss. Operation at 75V exceeds the device rating and risks gate oxide breakdown and catastrophic failure. The device must not be used in applications requiring the full 75V rating.

Q: What is the impact of lower on-resistance on thermal performance?

A: Lower on-resistance (Rds On) reduces conduction losses during the on-state, decreasing power dissipation and junction temperature rise. IRFZ44VPBF and IRFZ46NPBF, both rated at 16.5 mOhm, provide superior thermal performance compared to IRFZ44EPBF at 23 mOhm. For applications with tight thermal constraints, lower on-resistance devices reduce heat sink requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed carry RoHS3 compliance and REACH unaffected status, matching the regulatory profile of the original IXTP55N075T. No additional compliance verification is required for regulatory purposes.

Q: Which substitute should I select for new product designs?

A: IRFZ44NPBF is the recommended choice for new designs due to Active product status, ensuring long-term availability and manufacturing continuity. IRLZ44NPBF is an alternative with Active status and superior gate charge characteristics. Both devices provide adequate performance for most switching applications operating at 55V or below.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message