STL70N4LLF5 Equivalent & Substitute Parts

Part Overview

The STL70N4LLF5 is an N-Channel MOSFET manufactured by STMicroelectronics, rated for 40V drain-to-source voltage with 70A continuous drain current at Tc. This device is housed in a PowerFlat™ (5x6) surface mount package and is qualified to AEC-Q101 automotive standards. The part is currently in active production status with 15,310 units in stock.

Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter ranges while maintaining compatibility with the application's thermal, voltage, and current requirements. The following parts meet the core electrical specifications of the STL70N4LLF5.

Substiute Parts

STL70N4LLF5

STMicroelectronicsIn Stock: 15364STL70N4LLF5 Datasheet

Current PartRFQ

AON6236

Alpha & Omega Semiconductor Inc.In Stock: 30258AON6236 Datasheet

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BSC059N04LSGATMA1

Infineon TechnologiesIn Stock: 1788BSC059N04LSGATMA1 Datasheet

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CSD18504Q5A

Texas InstrumentsIn Stock: 28383CSD18504Q5A Datasheet

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DMN4008LFG-13

Diodes IncorporatedIn Stock: 23573DMN4008LFG-13 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the STL70N4LLF5 is determined by the following core electrical and mechanical parameters:

Primary Substitution Criteria:

• Drain-to-Source Voltage (Vdss): Must equal or exceed 40V
• Continuous Drain Current (Id) @ 25°C: Must support 70A (Tc) or equivalent thermal performance
• On-Resistance (Rds On): Must not exceed specified maximum values at rated conditions
• Gate Threshold Voltage (Vgs(th)): Must fall within acceptable operating range
• Operating Temperature Range: Must support -55°C to 175°C or equivalent automotive range
• Package Compatibility: Surface mount packages with compatible footprints and thermal characteristics
• RoHS and Compliance Status: ROHS3 compliant, REACH unaffected

Secondary Considerations:

• Gate Charge (Qg) and Input Capacitance (Ciss) affect switching performance
• Power Dissipation capability must support thermal requirements
• Product Status: Active status preferred; Not For New Designs parts noted where applicable

The substitute parts listed below meet the electrical specifications within acceptable tolerances and maintain surface mount compatibility.

Parameter Comparison

Engineering Selection Recommendations

STL70N4LLF5 (Primary Part) The STL70N4LLF5 remains the preferred choice for new designs requiring the full 70A continuous drain current capability at Tc. This part carries active product status, AEC-Q101 automotive qualification, and an extended operating temperature range to 175°C. It is suitable for high-current automotive and industrial applications.

BSC059N04LSGATMA1 (Infineon Technologies) The BSC059N04LSGATMA1 provides the closest electrical performance match with 73A continuous drain current at Tc, exceeding the STL70N4LLF5 specification. This part is active and suitable for applications requiring equivalent or higher current capacity. The operating temperature range extends to 150°C, which is acceptable for most automotive applications. Package compatibility is maintained with surface mount construction.

CSD18504Q5A (Texas Instruments) The CSD18504Q5A delivers 50A continuous drain current at Tc with 77W power dissipation capability, making it suitable for moderate-to-high current applications. This part is active and provides good thermal performance. The operating temperature range to 150°C is standard for automotive-grade devices. This option is appropriate when 50A current capacity is sufficient.

AON6236 (Alpha & Omega Semiconductor) The AON6236 is marked as Not For New Designs and provides only 30A continuous drain current at Tc. This part is not recommended for new applications requiring the full performance envelope of the STL70N4LLF5. Existing designs using this part may continue to source it from available inventory.

DMN4008LFG-13 (Diodes Incorporated) The DMN4008LFG-13 provides only 14.4A continuous drain current at Ta and is not suitable as a direct substitute for the STL70N4LLF5 in high-current applications. This part is active but offers significantly reduced current capacity and power dissipation. It is applicable only in lower-current circuit implementations.

Frequently Asked Questions (FAQ)

Q: Can the BSC059N04LSGATMA1 directly replace the STL70N4LLF5 in existing designs?

A: The BSC059N04LSGATMA1 meets the core electrical specifications with 73A continuous drain current at Tc, exceeding the STL70N4LLF5 rating. However, PCB layout and thermal management design must be verified for compatibility with the PG-TDSON-8-5 package footprint. Mechanical fit and thermal interface characteristics should be confirmed before implementation.

Q: What is the significance of the "Not For New Designs" status on the AON6236?

A: Parts marked "Not For New Designs" indicate that the manufacturer is not recommending this device for new circuit development. While existing inventory may be available, designs should transition to active alternatives. The AON6236 also provides only 30A continuous drain current, which is insufficient for applications requiring the full 70A capability of the STL70N4LLF5.

Q: How do gate charge and input capacitance differences affect substitution?

A: Gate charge (Qg) and input capacitance (Ciss) determine switching speed and gate drive requirements. The STL70N4LLF5 exhibits lower gate charge (13 nC @ 4.5V) compared to substitute parts, resulting in faster switching transitions and lower gate drive power consumption. Substitute parts with higher gate charge values require higher gate drive current and may introduce additional switching losses. Circuit design must accommodate these differences in gate drive capability.

Q: Are all substitute parts automotive-qualified?

A: The STL70N4LLF5 carries AEC-Q101 automotive qualification. The substitute parts listed do not specify AEC-Q101 qualification in the provided data. Applications requiring automotive-grade qualification should prioritize the STL70N4LLF5 or verify qualification status with manufacturers before selection.

Q: What is the impact of the operating temperature range difference between 175°C and 150°C?

A: The STL70N4LLF5 supports operation to 175°C junction temperature, while substitute parts are rated to 150°C. This 25°C difference affects thermal margin in high-temperature environments. Applications operating near maximum junction temperature should retain the STL70N4LLF5 to maintain adequate thermal headroom.

Q: Can the CSD18504Q5A be used in applications requiring 70A continuous current?

A: The CSD18504Q5A provides 50A continuous drain current at Tc, which is 20A below the STL70N4LLF5 specification. This part is not suitable for applications requiring sustained 70A operation. It is applicable only in designs where 50A continuous current is the maximum requirement.

Q: How do package differences affect PCB layout and thermal performance?

A: The STL70N4LLF5 uses PowerFlat™ (5x6) packaging, while substitutes employ 8-DFN, PG-TDSON-8-5, 8-VSONP, and PowerDI3333-8 packages. Although many maintain 5x6mm footprints, internal lead frame geometry and thermal pad design differ. Thermal interface resistance and current distribution characteristics vary by package type. PCB layout, thermal vias, and copper area allocation must be re-evaluated for each substitute to ensure equivalent thermal performance.

Q: What inventory considerations apply to substitute selection?

A: The STL70N4LLF5 has 15,310 units in stock. Substitute parts show varying availability: BSC059N04LSGATMA1 (1,738 units), CSD18504Q5A (28,323 units), AON6236 (30,200 units), and DMN4008LFG-13 (23,556 units). Inventory levels should be considered in long-term supply chain planning, particularly for the BSC059N04LSGATMA1 with limited stock.