STB55NF06T4 N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The STB55NF06T4 is an N-Channel 60V 50A surface mount MOSFET manufactured by STMicroelectronics in the STripFET™ II series. This device operates in the D2PAK (TO-263-3) package and is rated for 110W power dissipation at case temperature. The part is currently in Active product status with 18,852 units in stock.

Substitute parts are necessary when the primary part becomes unavailable, when alternative sourcing is required for supply chain resilience, or when design flexibility demands evaluation of equivalent devices from different manufacturers. Substitutes must maintain electrical compatibility across critical parameters including drain-source voltage rating, continuous drain current, on-resistance characteristics, and thermal performance within the same package form factor.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	60	V
Continuous Drain Current (Id) @ 25°C	50	A (Tc)
On-Resistance (Rds On) @ 27.5A, 10V	18	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	4	V
Gate Charge (Qg) @ 10V	60	nC
Power Dissipation (Max)	110	W (Tc)
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	D2PAK (TO-263-3)	Surface Mount
Maximum Gate Voltage	±20	V
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution logic for the STB55NF06T4 is based on the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Drain-Source Voltage (Vdss): 60V or higher
Continuous Drain Current (Id): 50A or higher at 25°C case temperature
Package Type: D2PAK (TO-263-3) surface mount form factor
Operating Temperature Range: -55°C to 175°C minimum
Gate Voltage Rating: ±20V or higher
RoHS3 Compliance and REACH Unaffected status

Secondary Compatibility Factors:

On-Resistance (Rds On): Lower or equivalent values preferred for thermal performance
Gate Charge (Qg): Lower values reduce switching losses
Power Dissipation: Equal or higher ratings accommodate thermal requirements
Moisture Sensitivity Level: MSL 1 (Unlimited) for handling compatibility

Substitute parts are grouped into two categories: Direct Equivalents (matching all primary criteria with minimal parameter variance) and Compatible Alternatives (meeting primary criteria with acceptable parameter trade-offs).

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Qg (nC)	Power Diss. (W)	Product Status	Package
STB55NF06T4	STMicroelectronics	60	50	18 @ 27.5A, 10V	60 @ 10V	110	Active	D2PAK
IPB081N06L3GATMA1	Infineon Technologies	60	50	8.1 @ 50A, 10V	29 @ 4.5V	79	Active	D2PAK
IRFZ44NSTRLPBF	Infineon Technologies	55	49	17.5 @ 25A, 10V	63 @ 10V	94	Active	D2PAK
IRFZ44ESTRLPBF	Infineon Technologies	60	48	23 @ 29A, 10V	60 @ 10V	110	Not For New Designs	D2PAK
IRFZ44SPBF	Vishay Siliconix	60	50	28 @ 31A, 10V	67 @ 10V	150	Active	D2PAK
IRFZ44STRLPBF	Vishay Siliconix	60	50	28 @ 31A, 10V	67 @ 10V	150	Active	D2PAK
IRFZ44ZSTRRPBF	Infineon Technologies	55	51	13.9 @ 31A, 10V	43 @ 10V	80	Not For New Designs	D2PAK
IRF1010ESTRLPBF	Infineon Technologies	60	84	12 @ 50A, 10V	130 @ 10V	200	Active	D2PAK
IRFS3806TRLPBF	Infineon Technologies	60	43	15.8 @ 25A, 10V	30 @ 10V	71	Active	D2PAK
FDB13AN06A0	onsemi	60	62	13.5 @ 62A, 10V	29 @ 10V	115	Active	D2PAK
BUK7610-55AL,118	Nexperia USA Inc.	55	75	10 @ 25A, 10V	124 @ 10V	300	Obsolete	D2PAK

Engineering Selection Recommendations

Recommended Direct Equivalents (Active Status):

IPB081N06L3GATMA1 (Infineon Technologies OptiMOS™ series) is the primary recommended substitute. This device matches the STB55NF06T4 across all critical parameters: 60V Vdss rating, 50A continuous drain current, D2PAK package, and -55°C to 175°C operating range. The IPB081N06L3GATMA1 demonstrates superior on-resistance performance (8.1 mOhm versus 18 mOhm) and lower gate charge (29 nC versus 60 nC), resulting in reduced switching losses and improved thermal efficiency. Product status is Active with 14,919 units in stock.

IRFZ44NSTRLPBF (Infineon Technologies HEXFET® series) provides functional equivalence with minor parameter trade-offs. The 55V Vdss rating is acceptable for 60V-rated applications with appropriate design margin. Continuous drain current of 49A meets the 50A requirement within tolerance. On-resistance of 17.5 mOhm is comparable to the primary part. Product status is Active with 21,134 units in stock.

FDB13AN06A0 (onsemi PowerTrench® series) offers enhanced current handling at 62A continuous drain current with equivalent 60V Vdss rating. On-resistance of 13.5 mOhm provides superior thermal performance. Gate charge of 29 nC reduces switching losses. Product status is Active with 15,265 units in stock.

IRFZ44SPBF and IRFZ44STRLPBF (Vishay Siliconix) both provide 60V/50A ratings in D2PAK packages with Active product status. These devices feature higher on-resistance (28 mOhm) and gate charge (67 nC) compared to the primary part, resulting in increased power dissipation. However, the 150W power rating accommodates thermal requirements. IRFZ44SPBF is available in Tube packaging (2,300 units), while IRFZ44STRLPBF is available in Tape & Reel (2,144 units).

IRF1010ESTRLPBF (Infineon Technologies HEXFET® series) is suitable for applications requiring enhanced current handling. The 84A continuous drain current and 200W power dissipation provide significant thermal margin. The 60V Vdss rating and D2PAK package maintain compatibility. Higher gate charge (130 nC) increases switching losses. Product status is Active with 3,495 units in stock.

IRFS3806TRLPBF (Infineon Technologies HEXFET® series) is applicable for current-limited applications. The 43A continuous drain current is below the primary part specification but acceptable for designs with reduced current requirements. Superior on-resistance (15.8 mOhm) and low gate charge (30 nC) provide efficiency benefits. Product status is Active with 20,897 units in stock.

Not Recommended for New Designs:

IRFZ44ESTRLPBF and IRFZ44ZSTRRPBF carry "Not For New Designs" product status and should not be selected for new circuit implementations, despite meeting electrical parameters.

Obsolete Status:

BUK7610-55AL,118 (Nexperia USA Inc. TrenchMOS™ series) is marked Obsolete and is not suitable for new designs or long-term supply chain planning.

Frequently Asked Questions (FAQ)

Q: Can the IPB081N06L3GATMA1 directly replace the STB55NF06T4 without circuit modifications?

A: Yes. The IPB081N06L3GATMA1 maintains electrical compatibility across all critical parameters: 60V Vdss, 50A continuous drain current, D2PAK package, and -55°C to 175°C operating temperature. The superior on-resistance (8.1 mOhm versus 18 mOhm) and lower gate charge (29 nC versus 60 nC) provide performance improvements without requiring design changes.

Q: What is the significance of the on-resistance (Rds On) difference between substitute parts?

A: On-resistance directly affects power dissipation and thermal performance. Lower Rds On values reduce I²R losses during conduction. For example, the IPB081N06L3GATMA1 at 8.1 mOhm generates less heat than the STB55NF06T4 at 18 mOhm under identical current conditions. Higher Rds On values (such as IRFZ44SPBF at 28 mOhm) require enhanced thermal management but remain functional within the specified power dissipation rating.

Q: Are all substitute parts available in the same packaging options?

A: All substitute parts are available in D2PAK (TO-263-3) surface mount packages. However, packaging formats differ: some are supplied in Cut Tape (CT) & Digi-Reel®, others in Tape & Reel (TR), and IRFZ44SPBF in Tube format. Verify packaging compatibility with assembly equipment and procurement requirements before selection.

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 electrically functional, these devices should not be selected for new circuit implementations due to uncertain long-term availability and potential discontinuation. Use Active status parts for new designs to ensure supply chain continuity.

Q: How does gate charge (Qg) affect circuit performance?

A: Gate charge determines the energy required to switch the MOSFET on and off. Lower gate charge (such as IPB081N06L3GATMA1 at 29 nC) reduces switching losses and allows faster switching speeds with lower driver current requirements. Higher gate charge (such as IRF1010ESTRLPBF at 130 nC) increases switching losses and may require higher-capacity gate drivers.

Q: Can I use IRFZ44NSTRLPBF with its 55V Vdss rating in a 60V application?

A: The 55V Vdss rating of IRFZ44NSTRLPBF is acceptable for applications where the maximum supply voltage does not exceed 55V. For circuits with 60V supply rails, this part introduces reduced voltage margin and is not recommended. Use 60V-rated devices (IPB081N06L3GATMA1, IRFZ44SPBF, or IRFZ44STRLPBF) for full compatibility.

Q: What is the impact of higher power dissipation ratings on thermal design?

A: Higher power dissipation ratings (such as IRF1010ESTRLPBF at 200W versus STB55NF06T4 at 110W) indicate greater thermal capacity but do not reduce actual heat generation. Actual power dissipation depends on on-resistance and operating current. A higher-rated device provides thermal margin but does not improve efficiency unless on-resistance is also lower.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant and REACH Unaffected, matching the environmental compliance status of the STB55NF06T4. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all parts, indicating no special moisture handling requirements.

Q: Which substitute offers the best thermal performance?

A: The IPB081N06L3GATMA1 offers superior thermal performance with the lowest on-resistance (8.1 mOhm) and lowest gate charge (29 nC) among direct equivalents. The FDB13AN06A0 provides comparable on-resistance (13.5 mOhm) with higher current capacity (62A). Both devices reduce power dissipation compared to the primary part under identical operating conditions.

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