STL11N4LLF5 Equivalent & Substitute Parts

Part Overview

The STL11N4LLF5 is an N-Channel 40V 11A MOSFET manufactured by STMicroelectronics in the STripFET™ V series. This device is designed for surface mount applications in the PowerFlat™ (3.3x3.3) package format. The part is currently classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. Substitute parts must maintain compatibility across drain-source voltage ratings, continuous drain current specifications, on-resistance characteristics, and thermal performance parameters to ensure direct replacement capability.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Drain to Source Voltage (Vdss)	40	V
Current - Continuous Drain (Id) @ 25°C	11	A (Tc)
Rds On (Max) @ Id, Vgs	9.7	mOhm @ 5.5A, 10V
Vgs(th) (Max) @ Id	2.5	V @ 250µA
Gate Charge (Qg) (Max) @ Vgs	12.9	nC @ 4.5V
Input Capacitance (Ciss) (Max) @ Vds	1570	pF @ 25V
Power Dissipation (Max)	2.9 (Ta), 50 (Tc)	W
Operating Temperature	-55 to 150	°C (TJ)
Mounting Type	Surface Mount	—
Package / Case	8-PowerVDFN	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the STL11N4LLF5 are selected based on the following critical parameters that define functional equivalence:

Voltage Rating Compatibility: All substitute parts must operate at or above the 40V drain-source voltage specification. Parts rated at higher voltages (60V) remain compatible for 40V applications.

Continuous Drain Current: Substitute parts must support a minimum continuous drain current of 11A at 25°C (Tc rating). Parts with equal or higher current ratings satisfy this requirement.

On-Resistance (Rds On): The maximum on-resistance specification of 9.7 mOhm at specified gate-source voltage and drain current establishes the switching loss and thermal performance baseline. Substitute parts with equal or lower on-resistance values maintain or improve performance characteristics.

Gate Charge and Input Capacitance: These parameters affect switching speed and gate drive requirements. Substitute parts with comparable or lower values ensure compatibility with existing gate drive circuits.

Thermal Performance: Power dissipation ratings at both ambient (Ta) and case (Tc) temperatures must support the application's thermal requirements.

Package and Mounting: Surface mount compatibility and pin configuration must align with the original design footprint.

Compliance and Status: All substitute parts must maintain RoHS3 compliance and MSL Level 1 rating. Active product status provides ongoing availability and support.

Parameter Comparison

Parameter	STL11N4LLF5 (Main)	BSZ097N04LSGATMA1	BSZ100N06LS3GATMA1	FDMC8327L
Manufacturer	STMicroelectronics	Infineon Technologies	Infineon Technologies	Fairchild Semiconductor
Product Status	Obsolete	Active	Active	Active
FET Type	N-Channel	N-Channel	N-Channel	N-Channel
Drain to Source Voltage (Vdss)	40V	40V	60V	40V
Current - Continuous Drain (Id) @ 25°C	11A (Tc)	12A (Ta), 40A (Tc)	11A (Ta), 20A (Tc)	12A (Ta), 14A (Tc)
Rds On (Max) @ Id, Vgs	9.7 mOhm @ 5.5A, 10V	9.7 mOhm @ 20A, 10V	10 mOhm @ 20A, 10V	9.7 mOhm @ 12A, 10V
Vgs(th) (Max) @ Id	2.5V @ 250µA	2V @ 14µA	2.2V @ 23µA	3V @ 250µA
Gate Charge (Qg) (Max) @ Vgs	12.9 nC @ 4.5V	24 nC @ 10V	45 nC @ 10V	26 nC @ 10V
Input Capacitance (Ciss) (Max) @ Vds	1570 pF @ 25V	1900 pF @ 20V	3500 pF @ 30V	1850 pF @ 20V
Power Dissipation (Max)	2.9W (Ta), 50W (Tc)	2.1W (Ta), 35W (Tc)	2.1W (Ta), 50W (Tc)	2.3W (Ta), 30W (Tc)
Operating Temperature	-55°C to 150°C (TJ)	-55°C to 150°C (TJ)	-55°C to 150°C (TJ)	-55°C to 150°C (TJ)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	8-PowerVDFN	8-PowerTDFN	8-PowerVDFN	8-PowerWDFN
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	Not specified

Engineering Selection Recommendations

BSZ097N04LSGATMA1 (Infineon OptiMOS™): This part provides direct voltage and current compatibility at 40V and 12A continuous drain current. The on-resistance specification of 9.7 mOhm matches the main part exactly. Active product status ensures long-term availability. The higher gate charge (24 nC) and input capacitance (1900 pF) compared to the main part require gate drive circuit evaluation. The 8-PowerTDFN package differs from the original 8-PowerVDFN, necessitating PCB layout verification. RoHS3 compliance and MSL Level 1 rating are maintained.

BSZ100N06LS3GATMA1 (Infineon OptiMOS™): This part offers a higher voltage rating of 60V, providing additional design margin for 40V applications. Continuous drain current of 11A (Ta) and 20A (Tc) meets the 11A requirement. On-resistance of 10 mOhm is marginally higher than the main part specification. Gate charge (45 nC) and input capacitance (3500 pF) are significantly elevated, requiring gate drive circuit redesign. The 8-PowerVDFN package matches the original form factor. Active product status and full compliance certifications are present. High inventory availability (15,100 pcs) supports procurement continuity.

FDMC8327L (Fairchild PowerTrench®): This part maintains 40V voltage rating and provides 12A continuous drain current (Ta) and 14A (Tc). On-resistance of 9.7 mOhm matches the main part specification. Gate charge (26 nC) and input capacitance (1850 pF) are moderately elevated. The 8-MLP (3.3x3.3) package is mechanically similar to the original PowerFlat™ package but classified as 8-PowerWDFN, requiring footprint verification. Active product status and RoHS3 compliance are confirmed. MSL rating is not specified in available documentation.

Frequently Asked Questions (FAQ)

Q: Can the BSZ097N04LSGATMA1 be used as a direct replacement for the STL11N4LLF5?

A: The BSZ097N04LSGATMA1 provides electrical compatibility at 40V and 11A+ continuous drain current with matching on-resistance. However, the package designation differs (8-PowerTDFN vs. 8-PowerVDFN), requiring PCB layout verification. Gate charge and input capacitance are higher, necessitating gate drive circuit evaluation.

Q: Why does the BSZ100N06LS3GATMA1 have a 60V rating when the application requires 40V?

A: Higher voltage ratings provide additional design margin and do not prevent operation at lower voltages. The 60V rating ensures the device operates safely within the 40V application envelope. This part is suitable for applications where future voltage headroom is beneficial.

Q: What is the impact of higher gate charge on circuit performance?

A: Gate charge affects the energy required to switch the transistor on and off. Higher gate charge (24 nC to 45 nC compared to 12.9 nC) increases switching losses and may require gate drive circuits with higher current capability. Existing gate drive designs must be evaluated for compatibility.

Q: Are all substitute parts RoHS3 compliant?

A: All three substitute parts are confirmed RoHS3 compliant. The main part STL11N4LLF5 is also RoHS3 compliant, ensuring regulatory consistency across substitution options.

Q: What is the significance of MSL Level 1 rating?

A: MSL Level 1 indicates unlimited moisture sensitivity, meaning the component does not require special moisture control during storage and handling. All substitute parts maintain this rating, ensuring compatibility with standard component handling procedures.

Q: How do package differences affect PCB design?

A: While all parts use 8-pin surface mount packages in the PowerVDFN/PowerTDFN/PowerWDFN families, specific pin configurations and thermal pad dimensions may differ. PCB footprint libraries must be verified for each substitute part to ensure correct pad layout and thermal performance.

Q: Which substitute part offers the best thermal performance?

A: The BSZ100N06LS3GATMA1 provides the highest case temperature power dissipation rating at 50W (Tc), matching the main part specification. The BSZ097N04LSGATMA1 provides 35W (Tc), and the FDMC8327L provides 30W (Tc). Thermal performance selection depends on application heat dissipation requirements.

Q: Is the FDMC8327L suitable for high-volume production?

A: The FDMC8327L is active and available with 3,508 pcs in stock. However, inventory levels are lower than the Infineon alternatives (1,420 and 15,100 pcs respectively). Long-term availability should be confirmed with the supplier for high-volume commitments.

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