FDMA7670 Equivalent & Substitute Parts

Part Overview

The FDMA7670 is an N-Channel MOSFET manufactured by onsemi, rated for 30V drain-to-source voltage with 11A continuous drain current at 25°C. The device is housed in a 6-MicroFET (2x2) surface mount package and features a maximum on-resistance of 15mOhm at 11A and 10V gate-source voltage. The FDMA7670 is classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain compatibility across critical electrical parameters including voltage rating, current capacity, on-resistance characteristics, and thermal performance while accommodating different package geometries.

Substiute Parts

FDMA7670

onsemiIn Stock: 5921FDMA7670 Datasheet

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DMN3016LFDE-7

Diodes IncorporatedIn Stock: 15593DMN3016LFDE-7 Datasheet

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PMPB11EN,115

Nexperia USA Inc.In Stock: 85743PMPB11EN,115 Datasheet

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PMPB12UNEX

Nexperia USA Inc.In Stock: 30182PMPB12UNEX Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FDMA7670 is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Voltage Rating Compatibility: All substitute parts must maintain a minimum drain-to-source voltage rating of 30V to ensure safe operation in circuits designed for the FDMA7670. Parts with lower voltage ratings (such as 20V) are not suitable for direct substitution in applications requiring the full 30V rating.

Current Capacity: Substitute parts must support continuous drain current at or above 11A at 25°C ambient temperature. Parts with lower current ratings introduce thermal stress and potential circuit failure.

On-Resistance Performance: The on-resistance characteristic at specified gate-source voltage determines power dissipation and thermal behavior. Substitute parts with comparable or lower on-resistance values maintain equivalent thermal performance.

Gate Drive Voltage: Substitute parts must operate with standard gate drive voltages (4.5V and 10V) to ensure compatibility with existing gate driver circuits.

Operating Temperature Range: All substitute parts must support the full -55°C to 150°C junction temperature range to maintain reliability across industrial and automotive applications.

Surface Mount Packaging: All substitute parts utilize surface mount technology with 6-pin configurations, enabling direct PCB layout compatibility.

Compliance Standards: All substitute parts must maintain ROHS3 compliance and MSL 1 rating to meet regulatory and manufacturing requirements.

Based on these criteria, the substitute parts are grouped as follows:

Group 1 - Full Electrical Equivalents (30V, ≥10A): DMN3016LFDE-7 and PMPB11EN,115 maintain the 30V voltage rating with current ratings of 10A and 9A respectively, supporting applications requiring the full voltage specification.

Group 2 - Reduced Voltage Alternative (20V, ≥11A): PMPB12UNEX operates at 20V with 11.4A current capacity and is suitable only for applications where the lower voltage rating is acceptable.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (30V Rating Maintained):

The DMN3016LFDE-7 (Diodes Incorporated) and PMPB11EN,115 (Nexperia USA Inc.) are the preferred substitutes for applications requiring the full 30V voltage specification. Both devices are in active production status, ensuring long-term availability and supply chain stability. The DMN3016LFDE-7 offers superior on-resistance performance at 12mOhm compared to the FDMA7670's 15mOhm, resulting in lower power dissipation and improved thermal characteristics. The PMPB11EN,115 provides comparable on-resistance at 14.5mOhm with lower gate charge (20.6nC) and reduced input capacitance (840pF), offering faster switching performance in gate-driven applications. Both alternatives maintain ROHS3 compliance and MSL 1 rating, meeting all regulatory and manufacturing requirements.

Secondary Substitute (Reduced Voltage Rating):

The PMPB12UNEX (Nexperia USA Inc.) operates at 20V drain-to-source voltage and is suitable only for applications where the reduced voltage rating is acceptable. This device provides the highest continuous drain current at 11.4A and the lowest power dissipation at 470mW, making it advantageous for current-limited applications operating below 20V. The PMPB12UNEX is in active production and maintains full ROHS3 and MSL 1 compliance. However, the reduced maximum gate-source voltage (±12V versus ±20V) may limit compatibility with certain gate driver circuits designed for the FDMA7670.

Package Considerations:

The FDMA7670 utilizes a 6-WDFN package, while substitute parts employ 6-PowerUDFN (DMN3016LFDE-7) or 6-UDFN (PMPB11EN,115 and PMPB12UNEX) packages. These packages are mechanically similar with identical pin counts and pitch, enabling direct PCB layout compatibility with minimal redesign. Thermal performance differences between package types should be evaluated based on specific application thermal requirements.

Frequently Asked Questions (FAQ)

Q: Can the PMPB12UNEX be used as a direct replacement for the FDMA7670 in all applications?

A: No. The PMPB12UNEX operates at a maximum drain-to-source voltage of 20V, compared to the FDMA7670's 30V rating. Direct substitution is limited to applications where the circuit operates exclusively below 20V. Additionally, the PMPB12UNEX maximum gate-source voltage is ±12V versus ±20V for the FDMA7670, which may affect compatibility with gate driver circuits. Applications requiring the full 30V voltage specification must use DMN3016LFDE-7 or PMPB11EN,115.

Q: What are the key electrical differences between DMN3016LFDE-7 and PMPB11EN,115?

A: Both devices maintain the 30V voltage rating and support the required operating temperature range. The DMN3016LFDE-7 provides lower on-resistance (12mOhm versus 14.5mOhm) and higher power dissipation capability (730mW versus 1.7W at Ta). The PMPB11EN,115 offers lower gate charge (20.6nC versus 25.1nC) and reduced input capacitance (840pF versus 1415pF), resulting in faster switching characteristics. Selection between these two depends on whether thermal performance or switching speed is the primary design constraint.

Q: Are all substitute parts compatible with the existing PCB layout designed for the FDMA7670?

A: All substitute parts utilize 6-pin surface mount packages with identical pin pitch and similar physical dimensions. However, the specific package types differ (6-WDFN versus 6-PowerUDFN or 6-UDFN). PCB footprints must be verified for compatibility with the selected substitute part. Thermal pad dimensions and via placement may differ between package types, requiring layout review to ensure adequate thermal performance.

Q: Do all substitute parts meet the same compliance and regulatory requirements as the FDMA7670?

A: Yes. All three substitute parts (DMN3016LFDE-7, PMPB11EN,115, and PMPB12UNEX) are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings, matching the FDMA7670 specifications. All devices operate across the -55°C to 150°C junction temperature range, supporting industrial and automotive applications.

Q: What is the impact of lower gate threshold voltage in substitute parts?

A: The PMPB12UNEX exhibits a gate threshold voltage of 900mV compared to the FDMA7670's 3V. Lower threshold voltage enables faster turn-on at reduced gate drive voltages, potentially improving switching speed. However, this characteristic may increase susceptibility to parasitic gate drive signals in noisy environments. The DMN3016LFDE-7 and PMPB11EN,115 maintain lower threshold voltages (2V) compared to the FDMA7670, offering improved gate drive efficiency while remaining within standard gate driver operating ranges.

Q: How do on-resistance differences affect thermal performance?

A: On-resistance directly determines power dissipation according to P = I²R. The DMN3016LFDE-7 at 12mOhm generates lower heat than the FDMA7670 at 15mOhm when conducting the same current. At 11A continuous current, the DMN3016LFDE-7 dissipates approximately 1.45W compared to the FDMA7670's 1.82W, reducing thermal stress on the device and surrounding circuitry. Applications with marginal thermal budgets benefit from lower on-resistance alternatives.

Q: What is the significance of gate charge differences among substitute parts?

A: Gate charge determines the energy required to switch the device and influences switching speed in gate-driven applications. The PMPB11EN,115 at 20.6nC and PMPB12UNEX at 17nC require less gate charge than the FDMA7670 at 22nC, enabling faster switching with lower gate driver power consumption. The DMN3016LFDE-7 at 25.1nC requires slightly more gate charge, which may extend switching transitions in high-frequency applications but remains within acceptable ranges for standard gate driver circuits.

Q: Are there any supply chain or availability considerations for substitute parts?

A: The FDMA7670 is classified as obsolete, with no ongoing production. All three substitute parts are in active production status, ensuring long-term availability. The PMPB11EN,115 shows the highest inventory level (85,663 pieces), followed by DMN3016LFDE-7 (15,537 pieces) and PMPB12UNEX (30,100 pieces), indicating strong supply chain support for all alternatives.