IRLMS2002 N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The IRLMS2002 is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 20V drain-to-source voltage with 6.5A continuous drain current at 25°C. The device is packaged in a Micro6™ (SOT-23-6) surface mount configuration and is part of the HEXFET® series. The IRLMS2002 is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support, production continuity, and component sourcing in applications where this device was originally specified.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	20	V
Continuous Drain Current (Id) @ 25°C	6.5	A (Ta)
On-State Resistance (Rds On Max) @ Id, Vgs	30 mOhm @ 6.5A, 4.5V	Ω
Gate Threshold Voltage (Vgs(th) Max) @ Id	1.2	V @ 250µA
Gate Charge (Qg Max) @ Vgs	22	nC @ 5V
Maximum Gate Voltage (Vgs Max)	±12	V
Input Capacitance (Ciss Max) @ Vds	1310	pF @ 15V
Power Dissipation (Max)	2	W (Ta)
Package Type	SOT-23-6	—
Mounting Type	Surface Mount	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the IRLMS2002 is determined by strict electrical and mechanical compatibility across the following parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): Must equal or exceed 20V
Continuous Drain Current (Id): Must support the application's current requirements
On-State Resistance (Rds On): Must not exceed specified maximum values to maintain circuit performance
Gate Threshold Voltage (Vgs(th)): Must fall within acceptable operating range
Package/Mounting: Surface mount configuration required for PCB compatibility
Gate Voltage Rating (Vgs Max): Must accommodate driver circuit voltage levels

Secondary Compatibility Parameters:

Gate Charge (Qg): Affects switching speed and driver requirements
Input Capacitance (Ciss): Influences gate drive circuit design
Power Dissipation: Must be adequate for thermal management in the application

Substitute parts are grouped based on whether they meet the electrical specifications of the IRLMS2002 while maintaining functional equivalence in the target application. Parts with lower current ratings, higher on-state resistance, or incompatible packaging are listed with explicit parameter deviations noted.

Parameter Comparison

Parameter	IRLMS2002	STT5N2VH5	NTGS3446T1G	PMN28UNEX	RUQ050N02TR
Manufacturer	Infineon	STMicroelectronics	onsemi	Nexperia USA Inc.	Rohm Semiconductor
Vdss (V)	20	20	20	20	20
Id @ 25°C (A)	6.5 (Ta)	5 (Tj)	2.5 (Ta)	5.5 (Ta)	5 (Ta)
Rds On Max @ Id, Vgs (mOhm)	30 @ 6.5A, 4.5V	30 @ 2A, 4.5V	45 @ 5.1A, 4.5V	32 @ 5.5A, 4.5V	30 @ 5A, 4.5V
Vgs(th) Max @ Id (V)	1.2 @ 250µA	0.7 @ 250µA (Min)	1.2 @ 250µA	1.0 @ 250µA	1.3 @ 1mA
Qg Max @ Vgs (nC)	22 @ 5V	4.6 @ 4.5V	15 @ 4.5V	10 @ 4.5V	12 @ 4.5V
Vgs Max (V)	±12	±8	±12	±8	±10
Ciss Max @ Vds (pF)	1310 @ 15V	367 @ 16V	750 @ 10V	490 @ 10V	900 @ 10V
Power Dissipation Max (W)	2 (Ta)	1.6 (Tc)	0.5 (Ta)	0.57 (Ta) / 6.25 (Tc)	1.25 (Ta)
Package	SOT-23-6	SOT-23-6	SOT-23-6 Thin / TSOT-23-6	SC-74 / SOT-457	SOT-23-6 Thin / TSOT-23-6
Product Status	Obsolete	Not For New Designs	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

STT5N2VH5 (STMicroelectronics)

The STT5N2VH5 provides electrical equivalence in Vdss, Rds On, and package configuration. However, the continuous drain current rating is reduced to 5A compared to the IRLMS2002's 6.5A, representing a 23% reduction in current capacity. The part is classified as "Not For New Designs," indicating limited long-term availability. RoHS3 compliance is provided. Selection of this substitute is appropriate only when application current requirements do not exceed 5A at 25°C.

NTGS3446T1G (onsemi)

The NTGS3446T1G is an active product with RoHS3 compliance and full Vdss equivalence. The continuous drain current is significantly reduced to 2.5A, representing a 62% reduction from the IRLMS2002 specification. On-state resistance is higher at 45 mOhm compared to 30 mOhm. Power dissipation is limited to 500 mW. This substitute is suitable only for applications with substantially lower current requirements and is not recommended for direct replacement in designs requiring the full 6.5A capability.

PMN28UNEX (Nexperia USA Inc.)

The PMN28UNEX is an active product with RoHS3 compliance and provides the closest electrical match to the IRLMS2002 in terms of continuous drain current (5.5A) and on-state resistance (32 mOhm). Vdss equivalence is maintained at 20V. The package designation differs (SC-74 / SOT-457 versus SOT-23-6), requiring PCB layout verification for mechanical compatibility. Gate voltage rating is reduced to ±8V. This substitute is suitable for applications where the 5.5A current rating is adequate and package footprint compatibility can be confirmed.

RUQ050N02TR (Rohm Semiconductor)

The RUQ050N02TR is an active product with RoHS3 compliance and provides electrical equivalence in Vdss (20V), continuous drain current (5A), and on-state resistance (30 mOhm). The package is designated as TSMT6 (SC-95) with SOT-23-6 Thin / TSOT-23-6 compatibility noted. Gate voltage rating is ±10V. Power dissipation is 1.25W. This substitute provides strong electrical compatibility for applications where 5A current capacity is sufficient and requires verification of package footprint compatibility with the original SOT-23-6 layout.

Compliance and Availability Considerations

All substitute parts except STT5N2VH5 are classified as active products, ensuring ongoing availability and manufacturing support. All substitutes provide RoHS3 compliance, addressing environmental and regulatory requirements that the obsolete IRLMS2002 does not meet. Selection should prioritize active products (NTGS3446T1G, PMN28UNEX, RUQ050N02TR) for new production and long-term supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can the NTGS3446T1G directly replace the IRLMS2002 in all applications?

A: No. The NTGS3446T1G has a continuous drain current rating of 2.5A, which is 62% lower than the IRLMS2002's 6.5A rating. Direct replacement is only possible in applications where the actual circuit current does not exceed 2.5A at 25°C. Higher current applications will cause the device to exceed its thermal and electrical limits.

Q: What is the primary difference between the PMN28UNEX and other substitutes?

A: The PMN28UNEX offers the highest continuous drain current rating among substitutes at 5.5A, closest to the original 6.5A specification. However, its package designation (SC-74 / SOT-457) differs from the IRLMS2002's SOT-23-6, requiring verification that the footprint is compatible with the existing PCB layout before selection.

Q: Why is the RUQ050N02TR recommended despite its 5A current rating being lower than the IRLMS2002's 6.5A?

A: The RUQ050N02TR maintains electrical equivalence in Vdss (20V) and on-state resistance (30 mOhm), and is an active product with RoHS3 compliance. The 5A rating is adequate for many applications originally designed with the IRLMS2002. The 1A reduction in current capacity must be evaluated against the specific application's maximum current draw to determine suitability.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All four substitute parts (STT5N2VH5, NTGS3446T1G, PMN28UNEX, and RUQ050N02TR) are RoHS3 compliant. The original IRLMS2002 is RoHS non-compliant. This compliance difference is significant for applications subject to environmental regulations or customer requirements.

Q: What does "Not For New Designs" mean for the STT5N2VH5?

A: "Not For New Designs" indicates that the manufacturer (STMicroelectronics) is not recommending this part for new product development. While the part may still be available, it is in a limited or declining production status. For new designs or long-term production, active products such as NTGS3446T1G, PMN28UNEX, or RUQ050N02TR are preferred.

Q: How do I verify package compatibility between SOT-23-6 and TSOT-23-6 variants?

A: SOT-23-6 Thin (TSOT-23-6) is a thinner variant of the standard SOT-23-6 package. Both share the same pin pitch and footprint dimensions, making them mechanically compatible on standard PCBs. However, the reduced height of TSOT-23-6 may affect clearance in space-constrained applications. Consult the specific datasheet footprint drawings and verify PCB assembly clearances before finalizing the substitution.

Q: What is the significance of gate charge (Qg) differences between the IRLMS2002 and substitutes?

A: Gate charge affects the switching speed and the gate driver circuit requirements. The IRLMS2002 has a gate charge of 22 nC at 5V, while substitutes range from 4.6 nC to 15 nC. Lower gate charge enables faster switching and reduces driver power consumption. If the original gate driver was designed for the IRLMS2002's 22 nC specification, substitutes with significantly lower gate charge (such as STT5N2VH5 at 4.6 nC) will switch faster, potentially affecting circuit timing and EMI characteristics. Verify gate driver compatibility before substitution.

Q: Can I use the NTGS3446T1G in a high-current application originally designed for the IRLMS2002?

A: No. The NTGS3446T1G is rated for only 2.5A continuous drain current, compared to the IRLMS2002's 6.5A. Using it in a high-current application will cause the device to exceed its maximum junction temperature and power dissipation limits, resulting in thermal shutdown or permanent damage. Current derating analysis must be performed before any substitution.

Q: What is the difference between Ta and Tc temperature specifications?

A: Ta refers to ambient temperature, while Tc refers to case temperature. Power dissipation and current ratings specified at Ta are more conservative for practical applications, as they account for ambient conditions. Ratings at Tc are measured at the device case and are typically higher. When comparing substitutes, ensure consistent temperature reference points (Ta or Tc) to make valid electrical comparisons.

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