STB55NF06LT4 Equivalent & Substitute Parts

Part Overview

The STB55NF06LT4 is an N-Channel 60V 55A MOSFET manufactured by STMicroelectronics in the STripFET™ II series. This surface mount device is housed in a D2PAK (TO-263-3) package and is rated for 95W power dissipation at case temperature. The part is currently Active in product status with full RoHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts are necessary when the primary part experiences supply constraints, extended lead times, or when design flexibility permits selection from equivalent alternatives that meet the same electrical and mechanical specifications. All substitute parts listed maintain compatibility with the original D2PAK package footprint and electrical operating parameters.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	60	V
Continuous Drain Current (Id) @ 25°C	55	A (Tc)
Rds On (Max) @ 27.5A, 10V	18	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	4.7	V
Gate Charge (Qg) @ 4.5V	37	nC
Power Dissipation (Max)	95	W (Tc)
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	D2PAK (TO-263-3)	Surface Mount
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the STB55NF06LT4 is determined by the following critical parameters:

Voltage Rating: All substitute parts must maintain a minimum Drain to Source Voltage (Vdss) of 60V to ensure safe operation in circuits designed for this specification.

Current Rating: Substitute parts must support a continuous drain current (Id) of at least 55A at 25°C case temperature to handle the same load conditions.

On-State Resistance (Rds On): The maximum on-state resistance must not exceed 18mOhm at the specified gate voltage (10V) to maintain equivalent power efficiency and thermal performance.

Package Compatibility: All substitutes must use the D2PAK (TO-263-3) surface mount package to ensure mechanical and thermal interface compatibility with existing PCB designs.

Temperature Range: Operating temperature range must span -55°C to 175°C (TJ) to support the same environmental conditions.

Compliance: All parts must maintain RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are grouped into two categories: Direct Equivalents (matching all primary specifications within tolerance) and Functional Alternatives (meeting minimum electrical requirements with minor parameter variations).

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On Max (mOhm)	Vgs(th) (V)	Qg (nC)	Power Diss. (W)	Product Status
STB55NF06LT4	STMicroelectronics	60	55	18	4.7	37	95	Active
HUF76429S3ST	onsemi	60	47	22	3	46	110	Active
IRFZ44ESTRLPBF	Infineon Technologies	60	48	23	4	60	110	Not For New Designs
IRFZ44NSTRLPBF	Infineon Technologies	55	49	17.5	4	63	94	Active
IRFZ46NSTRLPBF	Infineon Technologies	55	53	16.5	4	72	107	Not For New Designs
IRFZ48RSPBF	Vishay Siliconix	60	50	18	4	110	190	Active
IRFZ48STRLPBF	Vishay Siliconix	60	50	18	4	110	190	Active
IRLZ44NSTRLPBF	Infineon Technologies	55	47	22	2	48	110	Not For New Designs
IRLZ44ZSTRLPBF	Infineon Technologies	55	51	13.5	3	36	80	Obsolete
PSMN015-60BS,118	Nexperia USA Inc.	60	50	14.8	4	20.9	86	Active

Engineering Selection Recommendations

Recommended Primary Substitutes (Active Status):

The following parts are suitable for new designs and ongoing production due to Active product status:

IRFZ48STRLPBF (Vishay Siliconix) and IRFZ48RSPBF (Vishay Siliconix) provide direct electrical equivalence with 60V rating, 50A continuous drain current, and 18mOhm on-state resistance. Both maintain D2PAK packaging and RoHS3 compliance. Higher power dissipation rating (190W) provides thermal margin.

IRFZ44NSTRLPBF (Infineon Technologies) operates at 55V with 49A continuous drain current and 17.5mOhm on-state resistance. This part is suitable for applications where 55V rating is acceptable. Active product status supports long-term availability.

PSMN015-60BS,118 (Nexperia USA Inc.) maintains 60V rating with 50A continuous drain current and superior on-state resistance of 14.8mOhm, providing improved efficiency. Active status and full compliance certifications support production use.

HUF76429S3ST (onsemi) provides 60V rating with 47A continuous drain current. Active product status and UltraFET™ series designation support ongoing availability.

Not Recommended for New Designs:

IRFZ44ESTRLPBF, IRFZ46NSTRLPBF, and IRLZ44NSTRLPBF carry "Not For New Designs" status and should be used only for legacy system maintenance or repair.

Not Recommended:

IRLZ44ZSTRLPBF is marked Obsolete and should not be selected for any new applications.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with lower continuous drain current rating than the STB55NF06LT4?

A: No. The STB55NF06LT4 is rated for 55A continuous drain current. Substitute parts must support at least 55A at 25°C case temperature to handle equivalent load conditions. Parts with lower ratings (such as HUF76429S3ST at 47A) are not suitable for direct substitution in circuits designed for the full 55A specification.

Q: What is the significance of the voltage rating difference between 60V and 55V parts?

A: The STB55NF06LT4 is rated for 60V Drain to Source Voltage. Parts rated at 55V (such as IRFZ44NSTRLPBF and IRFZ46NSTRLPBF) have a lower maximum voltage specification. These parts are suitable only for circuits where the maximum applied voltage does not exceed 55V. For circuits designed to operate at or near 60V, use only 60V-rated substitutes.

Q: Are all substitute parts available in the same D2PAK package?

A: Yes. All substitute parts listed are housed in D2PAK (TO-263-3) surface mount packages with identical pin configurations and thermal interface characteristics. Direct PCB footprint compatibility is maintained across all substitutes.

Q: What does "Not For New Designs" product status mean?

A: Parts marked "Not For New Designs" are in mature or declining production phases. While they may be available from inventory, manufacturers do not recommend their use in new circuit designs. These parts should be reserved for maintenance, repair, or legacy system support only. For new designs, select only parts with Active product status.

Q: How does on-state resistance (Rds On) affect circuit performance?

A: On-state resistance directly determines power dissipation and heat generation during operation. Lower Rds On values reduce power loss and thermal output. The STB55NF06LT4 specifies 18mOhm maximum. Substitutes with higher Rds On (such as 22mOhm or 23mOhm) will generate more heat and require thermal management verification. Substitutes with lower Rds On (such as 14.8mOhm or 13.5mOhm) provide improved efficiency.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1), matching the environmental and regulatory certifications of the STB55NF06LT4.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape and Tape & Reel are supply formats, not component package types. Both formats contain parts in D2PAK packages. Cut Tape is supplied in smaller quantities on individual tape segments. Tape & Reel is supplied in continuous reel format for high-volume automated assembly. The electrical and mechanical specifications are identical; packaging format selection depends on production volume and assembly equipment compatibility.

Q: Can I use PSMN015-60BS,118 as a direct replacement for the STB55NF06LT4?

A: Yes. PSMN015-60BS,118 meets all critical substitution criteria: 60V rating, 50A continuous drain current (exceeds 55A requirement), D2PAK package, RoHS3 compliance, and Active product status. The superior on-state resistance of 14.8mOhm provides improved efficiency compared to the 18mOhm specification of the STB55NF06LT4.

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