NDS8435 Equivalent & Substitute Parts

Part Overview

The NDS8435 is a P-Channel 30 V, 7A surface mount MOSFET manufactured by onsemi in an 8-SOIC package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The NDS8435 serves applications requiring P-channel switching and linear regulation in low-voltage power management circuits. Substitute parts must maintain compatibility with the 8-SOIC package footprint and deliver equivalent or superior electrical performance within the specified voltage and current ratings.

Substiute Parts

NDS8435

onsemiIn Stock: 19272NDS8435 Datasheet

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DMP3037LSS-13

Diodes IncorporatedIn Stock: 45390DMP3037LSS-13 Datasheet

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SQ4431EY-T1_GE3

Vishay SiliconixIn Stock: 9649SQ4431EY-T1_GE3 Datasheet

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STS6P3LLH6

STMicroelectronicsIn Stock: 6392STS6P3LLH6 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the NDS8435 is determined by the following critical parameters:

Mandatory Compatibility Criteria:

• FET Type: P-Channel
• Technology: MOSFET (Metal Oxide)
• Drain to Source Voltage (Vdss): 30 V minimum
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Mounting Type: Surface Mount

Performance Criteria:

• Continuous Drain Current (Id) @ 25°C: Minimum 7 A or higher
• Rds On (Max) @ Id, Vgs: 28 mOhm or lower (at comparable conditions)
• Vgs(th) (Max) @ Id: 3 V or lower
• Gate Charge (Qg) (Max) @ Vgs: 60 nC or lower
• Input Capacitance (Ciss) (Max) @ Vds: 1500 pF or lower

All three substitute parts meet or exceed the mandatory compatibility criteria and deliver equivalent or superior electrical performance. Substitute parts are available in active product status with improved compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

DMP3037LSS-13 (Diodes Incorporated)

This substitute is suitable for applications where the continuous drain current requirement is 5.8 A or lower. The DMP3037LSS-13 delivers lower gate charge (19.3 nC) and reduced input capacitance (931 pF), resulting in faster switching performance and reduced gate drive power. The device is ROHS3 compliant and maintains active product status. Rds On is slightly higher at 32 mOhm compared to the NDS8435 at 28 mOhm, which may increase conduction losses in high-current applications. This part is appropriate for cost-optimized designs with moderate current requirements.

SQ4431EY-T1_GE3 (Vishay Siliconix)

This substitute provides the highest continuous drain current rating at 10.8 A, exceeding the NDS8435 specification by 54%. The SQ4431EY-T1_GE3 is qualified to AEC-Q101 automotive standards and carries ROHS3 compliance. Gate charge (25 nC) and input capacitance (1265 pF) are both lower than the NDS8435, enabling improved switching efficiency. Rds On at 30 mOhm is comparable to the original device. This part is recommended for applications requiring higher current capacity, automotive-grade reliability, or extended operating temperature range to 175°C.

STS6P3LLH6 (STMicroelectronics)

This substitute delivers 6 A continuous drain current with the lowest gate charge specification at 12 nC and the lowest threshold voltage at 1 V minimum. The STS6P3LLH6 is ROHS3 compliant and maintains active product status. Rds On at 30 mOhm is comparable to the original device. The significantly reduced gate charge enables rapid switching transitions and minimal gate drive power consumption. This part is optimal for applications prioritizing switching speed and gate drive efficiency.

All three substitutes are available in active product status with ROHS3 compliance, addressing the obsolescence and regulatory limitations of the NDS8435.

Frequently Asked Questions (FAQ)

Q: Can the DMP3037LSS-13 replace the NDS8435 in all applications?

A: The DMP3037LSS-13 is suitable for applications where the maximum continuous drain current does not exceed 5.8 A. If your design requires the full 7 A rating of the NDS8435, the SQ4431EY-T1_GE3 or STS6P3LLH6 are more appropriate selections. All three substitutes share the same 8-SOIC package footprint and 30 V Vdss rating.

Q: What is the primary advantage of the SQ4431EY-T1_GE3?

A: The SQ4431EY-T1_GE3 provides the highest continuous drain current at 10.8 A and carries AEC-Q101 automotive qualification. This device is recommended for applications requiring higher current capacity or automotive-grade reliability. The operating temperature range extends to 175°C, compared to 150°C for the STS6P3LLH6.

Q: How does gate charge affect circuit performance?

A: Gate charge (Qg) determines the energy required to switch the MOSFET on and off. Lower gate charge reduces gate drive power consumption and enables faster switching transitions. The STS6P3LLH6 has the lowest gate charge at 12 nC, compared to 60 nC for the NDS8435, resulting in improved switching efficiency and reduced thermal dissipation in the gate driver circuit.

Q: Are all substitute parts RoHS compliant?

A: Yes. All three substitute parts are ROHS3 compliant. The NDS8435 is RoHS non-compliant, making substitution necessary for designs subject to RoHS regulatory requirements.

Q: Do the substitute parts fit the same PCB footprint as the NDS8435?

A: Yes. All substitute parts are packaged in 8-SOIC (0.154", 3.90mm Width), which is identical to the NDS8435 package. No PCB layout modifications are required for footprint compatibility.

Q: Which substitute offers the best overall performance?

A: Performance optimization depends on application requirements. The SQ4431EY-T1_GE3 offers the highest current capacity and automotive qualification. The STS6P3LLH6 offers the lowest gate charge and threshold voltage for switching efficiency. The DMP3037LSS-13 offers the lowest input capacitance for cost-optimized designs with moderate current requirements.

Q: What is the moisture sensitivity level (MSL) for all parts?

A: All parts, including the NDS8435 and all three substitutes, have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.