PMR280UN,115 N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The PMR280UN,115 is an N-Channel MOSFET manufactured by NXP USA Inc., designed for surface mount applications in the SC-75 package. This device features a 20V drain-to-source voltage rating with 980mA continuous drain current capability and 530mW power dissipation. The part is classified as Obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and component procurement.

Substiute Parts

PMR280UN,115

NXP USA Inc.In Stock: 12822PMR280UN,115 Datasheet

Current PartRFQ

DMG1012TQ-7

Diodes IncorporatedIn Stock: 110149DMG1012TQ-7 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PMR280UN,115 is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• FET Type: N-Channel topology must be maintained
• Drain-to-Source Voltage (Vdss): Minimum 20V rating required
• Continuous Drain Current (Id): Minimum 980mA at 25°C required to support original circuit current demands
• On-Resistance (Rds On): Maximum 340mOhm at specified gate voltage to ensure equivalent switching performance
• Gate Threshold Voltage (Vgs(th)): Maximum 1V at 250µA for compatible gate drive requirements
• Power Dissipation: Minimum 530mW capability required
• Operating Temperature Range: -55°C to 150°C minimum

Mechanical Compatibility Criteria:

• Mounting Type: Surface Mount required
• Package Footprint: SC-75, SOT-416, or equivalent pinout-compatible packages

The DMG1012TQ-7 is identified as a manufacturer-recommended substitute. While this part operates within the same voltage and temperature specifications, specific electrical parameters differ and must be evaluated for circuit-level compatibility.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility:

The DMG1012TQ-7 presents a partial electrical match with the PMR280UN,115. Both devices share identical Vdss (20V), Vgs(th) (1V @ 250µA), and operating temperature range (-55°C to 150°C). Both are RoHS3 compliant with MSL 1 rating.

Critical Differences Requiring Circuit Evaluation:

1. Continuous Drain Current: The DMG1012TQ-7 provides 630mA continuous current versus 980mA for the PMR280UN,115. This 36% reduction in current capacity may limit substitution in high-current applications.

2. Power Dissipation: The DMG1012TQ-7 is rated for 280mW maximum dissipation compared to 530mW for the original part. Thermal design margins must be reassessed.

3. On-Resistance: The DMG1012TQ-7 exhibits 400mOhm Rds On (measured at 600mA, 4.5V) versus 340mOhm for the PMR280UN,115 (measured at 200mA, 4.5V). Higher on-resistance increases power loss.

4. Package Transition: The DMG1012TQ-7 uses SOT-523 packaging versus SC-75/SOT-416 for the original part. PCB layout and footprint redesign is required.

5. Product Status: Both parts carry restricted product status (Obsolete and Not For New Designs). Long-term availability should be confirmed with suppliers.

Compliance Status:

Both parts maintain ROHS3 compliance, REACH Unaffected status, and EAR99 export classification, ensuring regulatory continuity.

Frequently Asked Questions (FAQ)

Q: Can the DMG1012TQ-7 directly replace the PMR280UN,115 in existing designs?

A: Direct replacement is not recommended without circuit-level analysis. While both devices share the same Vdss and Vgs(th) specifications, the DMG1012TQ-7 provides lower continuous drain current (630mA vs. 980mA) and reduced power dissipation capability (280mW vs. 530mW). Applications operating near the original part's current or thermal limits may experience performance degradation or failure.

Q: What are the package compatibility implications?

A: The PMR280UN,115 uses SC-75/SOT-416 packaging, while the DMG1012TQ-7 uses SOT-523. These packages have different pinout configurations and physical dimensions. PCB footprint redesign and layout modification are mandatory. Pin-to-pin compatibility cannot be assumed.

Q: Are both parts suitable for new designs?

A: No. Both the PMR280UN,115 (Obsolete) and DMG1012TQ-7 (Not For New Designs) carry restricted product status. For new designs, consultation with component suppliers for current-generation N-Channel MOSFETs with equivalent electrical specifications is required.

Q: How do the on-resistance specifications compare?

A: The PMR280UN,115 specifies 340mOhm Rds On at 200mA and 4.5V gate voltage. The DMG1012TQ-7 specifies 400mOhm at 600mA and 4.5V gate voltage. Direct comparison is complicated by different measurement conditions. Circuit simulations accounting for actual operating current and gate voltage are necessary to determine thermal impact.

Q: What is the significance of the different current measurement conditions (Tc vs. Ta)?

A: The PMR280UN,115 continuous drain current (980mA) is specified at Tc (case temperature), while the DMG1012TQ-7 current (630mA) is specified at Ta (ambient temperature). These different reference conditions affect real-world current capacity calculations and thermal management requirements.

Q: Are there compliance or certification differences?

A: Both parts are RoHS3 compliant with MSL 1 rating. The DMG1012TQ-7 carries AEC-Q101 automotive qualification, which the PMR280UN,115 does not. This qualification is relevant only for automotive applications and does not affect general-purpose industrial or consumer use.

Q: What should be verified before implementing a substitution?

A: Circuit-level analysis must confirm that the reduced continuous drain current (630mA), increased on-resistance (400mOhm), and lower power dissipation rating (280mW) do not violate design margins. Thermal simulation under worst-case operating conditions is required. PCB layout must be redesigned for SOT-523 package compatibility. Supplier availability and lead times for both the substitute and alternative parts should be confirmed.