SI3443DV P-Channel MOSFET 20V 4.4A Equivalent & Substitute Parts

Part Overview

The SI3443DV is a P-Channel MOSFET manufactured by Infineon Technologies, rated for 20V drain-to-source voltage with 4.4A continuous drain current at 25°C. The device is packaged in Micro6™ (TSOP-6) surface mount configuration and is designed for low-power switching applications requiring compact form factors.

The SI3443DV carries an Obsolete product status. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements. Active alternatives with comparable electrical characteristics and compatible packaging are available from multiple manufacturers including onsemi and Diodes Incorporated.

Substiute Parts

SI3443DV

Infineon TechnologiesIn Stock: 19031SI3443DV Datasheet

Current PartRFQ

NTGS3443T1G

onsemiIn Stock: 38432NTGS3443T1G Datasheet

DirectRFQ

DMP2033UVT-13

Diodes IncorporatedIn Stock: 1037DMP2033UVT-13 Datasheet

MFR RecommendedRFQ

DMP2033UVT-7

Diodes IncorporatedIn Stock: 27399DMP2033UVT-7 Datasheet

MFR RecommendedRFQ

FDC638P

onsemiIn Stock: 65446FDC638P Datasheet

MFR RecommendedRFQ

NTGS3441T1G

onsemiIn Stock: 35485NTGS3441T1G Datasheet

MFR RecommendedRFQ

NTGS4111PT1G

onsemiIn Stock: 125191NTGS4111PT1G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SI3443DV is determined by the following critical parameters:

Primary Substitution Criteria:

• Drain-to-Source Voltage (Vdss): Must equal or exceed 20V
• FET Type: Must be P-Channel
• Technology: Must be MOSFET (Metal Oxide)
• Package Type: Must be SOT-23-6 Thin (TSOP-6) or compatible surface mount configuration
• Operating Temperature Range: Must support -55°C to 150°C (TJ)
• Continuous Drain Current (Id): Must support minimum 4.4A at 25°C for direct replacement; lower ratings acceptable for current-limited applications
• On-Resistance (Rds On): Must not exceed 65 mOhm at rated conditions to maintain thermal performance
• Moisture Sensitivity Level (MSL): Must be MSL 1 (Unlimited)

Secondary Compatibility Factors:

• Gate Threshold Voltage (Vgs(th)): Acceptable range 900mV to 1.5V @ 250µA
• Maximum Gate Voltage (Vgs): Must support ±8V minimum (±12V preferred)
• Power Dissipation: Must support minimum 1.2W at 25°C ambient
• RoHS Compliance: Active parts preferred; RoHS3 compliance required for new designs

Substitute parts are grouped into two categories: Direct Equivalents (matching or exceeding all primary parameters) and Functional Alternatives (meeting core electrical requirements with acceptable trade-offs in secondary parameters).

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent Substitutes (Recommended for Pin-Compatible Replacement):

DMP2033UVT-7 (Diodes Incorporated) and DMP2033UVT-13 (Diodes Incorporated) are the primary recommended substitutes. Both devices match the SI3443DV in Vdss (20V), deliver comparable continuous drain current (4.2A), maintain identical on-resistance specification (65 mOhm @ 4.5V), and are packaged in SOT-23-6 (TSOP-6) surface mount configuration. Both parts carry Active product status and RoHS3 compliance, supporting long-term supply chain continuity. DMP2033UVT-7 offers superior inventory availability (27,300 pcs) compared to DMP2033UVT-13 (998 pcs).

FDC638P (onsemi, PowerTrench® series) provides enhanced performance characteristics with 4.5A continuous drain current, superior on-resistance (48 mOhm @ 4.5A, 4.5V), and higher power dissipation capability (1.6W). This part is suitable for applications requiring improved thermal performance and current handling. FDC638P maintains 20V Vdss rating, SOT-23-6 packaging, Active status, and RoHS3 compliance. Inventory availability is excellent (65,400 pcs).

NTGS3443T1G (onsemi) matches the SI3443DV electrical specifications precisely, including Vdss (20V), on-resistance (65 mOhm @ 4.4A, 4.5V), and gate charge (15 nC @ 4.5V). However, continuous drain current is reduced to 2.2A, limiting this part to lower-current applications. Product status is Active with RoHS3 compliance and strong inventory (38,400 pcs).

Functional Alternatives (Current-Limited or Voltage-Elevated Applications):

NTGS3441T1G (onsemi) is suitable for applications with reduced current requirements (1.65A continuous drain). This part maintains 20V Vdss, SOT-23-6 packaging, and Active status with RoHS3 compliance. On-resistance is higher (90 mOhm @ 3.3A, 4.5V), reflecting the lower current rating.

NTGS4111PT1G (onsemi) is applicable to designs requiring higher voltage margin. This part provides 30V Vdss (exceeding the 20V requirement), supporting applications with elevated supply voltages or transient overvoltage conditions. Continuous drain current is 2.6A, and on-resistance is 60 mOhm @ 3.7A, 10V. Gate threshold voltage is elevated (3.0V @ 250µA), requiring higher gate drive voltage. Product status is Active with RoHS3 compliance and excellent inventory (125,100 pcs).

Selection Criteria Summary:

• For direct replacement in existing designs: Select DMP2033UVT-7 or FDC638P
• For RoHS3 compliance in new designs: All listed substitutes qualify
• For maximum current handling: Select FDC638P (4.5A)
• For lowest on-resistance: Select FDC638P (48 mOhm)
• For highest inventory availability: Select NTGS4111PT1G (125,100 pcs) or FDC638P (65,400 pcs)
• For exact electrical match: Select NTGS3443T1G (matching gate charge and threshold voltage)

All substitute parts maintain MSL 1 (Unlimited) moisture sensitivity rating and operating temperature range of -55°C to 150°C (TJ), ensuring compatibility with the original SI3443DV thermal and environmental specifications.

Frequently Asked Questions (FAQ)

Q: Can DMP2033UVT-7 be used as a direct drop-in replacement for SI3443DV?

A: Yes. DMP2033UVT-7 is electrically compatible and physically compatible. Both devices are packaged in SOT-23-6 (TSOP-6) surface mount configuration with identical pin assignments. Electrical parameters including Vdss (20V), on-resistance (65 mOhm @ 4.5V), and gate threshold voltage (0.9V @ 250µA) support direct substitution. The primary difference is continuous drain current: DMP2033UVT-7 is rated 4.2A versus SI3443DV at 4.4A. For applications operating below 4.2A, substitution is direct. For applications requiring the full 4.4A rating, FDC638P (4.5A) is recommended.

Q: What is the difference between DMP2033UVT-7 and DMP2033UVT-13?

A: Both parts are electrically identical. DMP2033UVT-7 and DMP2033UVT-13 share the same base product number (DMP2033) and carry identical electrical specifications: 20V Vdss, 4.2A continuous drain current, 65 mOhm on-resistance, and SOT-23-6 packaging. The suffix designates different packaging configurations or manufacturing dates. DMP2033UVT-7 is available in significantly higher quantities (27,300 pcs) and is the preferred selection for supply chain continuity.

Q: Why does NTGS4111PT1G have a higher Vdss rating (30V) than SI3443DV (20V)?

A: NTGS4111PT1G is designed for applications requiring higher voltage margin or operating in systems with elevated supply voltages. The 30V Vdss rating provides additional safety margin against transient overvoltage events. This part is suitable for substitution in designs where the 20V rating of SI3443DV is marginal or where system voltage may exceed nominal specifications. However, gate threshold voltage is elevated (3.0V @ 250µA versus 1.5V for SI3443DV), requiring higher gate drive voltage for full on-state performance.

Q: Is FDC638P suitable for all SI3443DV applications?

A: FDC638P is suitable for most applications and offers performance advantages including higher continuous drain current (4.5A versus 4.4A), superior on-resistance (48 mOhm versus 65 mOhm), and higher power dissipation capability (1.6W versus 2.0W). The primary consideration is gate threshold voltage: FDC638P maintains 1.5V @ 250µA, matching SI3443DV. FDC638P is packaged in SuperSOT™-6, which is physically compatible with SOT-23-6 (TSOP-6) footprints. This part is recommended for new designs and applications requiring improved thermal performance.

Q: What is the impact of lower continuous drain current in NTGS3443T1G (2.2A)?

A: NTGS3443T1G is suitable only for applications where continuous drain current does not exceed 2.2A at 25°C ambient temperature. If the design requires the full 4.4A rating of SI3443DV, NTGS3443T1G will operate in thermal stress and may not meet reliability requirements. For current-limited applications (≤2.2A), NTGS3443T1G provides exact electrical matching including gate charge (15 nC @ 4.5V) and on-resistance (65 mOhm @ 4.4A, 4.5V).

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 compliance certification. The original SI3443DV is RoHS non-compliant. For new product designs or applications requiring RoHS3 compliance, any of the listed substitutes qualify. Existing designs using SI3443DV can transition to RoHS3-compliant alternatives without design modification, provided electrical parameters remain within acceptable ranges.

Q: What is the significance of MSL 1 (Unlimited) rating?

A: MSL 1 (Unlimited) indicates that the device has no moisture sensitivity limitations and does not require special handling, storage, or baking procedures prior to soldering. All listed parts, including SI3443DV and all substitutes, carry MSL 1 rating, ensuring compatibility with standard manufacturing processes and storage conditions.

Q: Can NTGS3441T1G be used in high-current applications?

A: No. NTGS3441T1G is rated for 1.65A continuous drain current at 25°C, which is significantly below the SI3443DV rating of 4.4A. This part is suitable only for low-current switching applications. For applications requiring 4.4A or higher current handling, select DMP2033UVT-7 (4.2A), FDC638P (4.5A), or NTGS4111PT1G (2.6A with 30V rating).

Q: What is the thermal performance difference between SI3443DV and FDC638P?

A: FDC638P offers superior thermal performance through lower on-resistance (48 mOhm versus 65 mOhm) and higher power dissipation capability (1.6W versus 2.0W). Lower on-resistance reduces I²R losses during conduction, resulting in lower junction temperature for equivalent current levels. This advantage is particularly significant in applications operating at or near the maximum continuous drain current rating.

Q: Are there package compatibility concerns when substituting these parts?

A: All listed substitute parts are packaged in SOT-23-6 Thin (TSOP-6) or SuperSOT™-6 configurations, which are physically and electrically compatible with the SI3443DV SOT-23-6 (TSOP-6) package. Pin assignments are identical, supporting direct PCB footprint compatibility without layout modification. No package-related design changes are required for substitution.