CSD18512Q5B Equivalent & Substitute Parts

Part Overview

The CSD18512Q5B is an N-Channel MOSFET manufactured by Texas Instruments, part of the NexFET™ series. This device is rated for 40V drain-to-source voltage with a continuous drain current of 211A at Tc (case temperature). It is housed in an 8-VSON-CLIP (5x6) surface mount package and is designed for high-current switching applications requiring low on-resistance performance. The part maintains Active product status and is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are identified when alternative MOSFETs meet or exceed the critical electrical and mechanical parameters required for direct replacement in circuit designs, ensuring functional compatibility without circuit redesign.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	40	V
Continuous Drain Current (Id) @ 25°C	211	A (Tc)
On-Resistance (Rds On Max) @ Id, Vgs	1.6	mOhm @ 30A, 10V
Gate Threshold Voltage (Vgs(th) Max) @ Id	2.2	V @ 250µA
Maximum Gate Voltage (Vgs Max)	±20	V
Input Capacitance (Ciss Max) @ Vds	7120	pF @ 20V
Power Dissipation (Max)	139	W (Tc)
Operating Temperature Range	-55 to 150	°C (TJ)
Mounting Type	Surface Mount	—
Package	8-VSON-CLIP (5x6)	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the CSD18512Q5B are identified based on the following critical parameters that determine functional equivalence:

Voltage Rating Compatibility: The substitute must maintain a Drain-to-Source Voltage (Vdss) rating of 40V or higher to ensure safe operation in the same circuit topology.

Current Handling Capability: The substitute must support continuous drain current (Id) at case temperature (Tc) sufficient for the application. The CSD18512Q5B specifies 211A at Tc; substitutes with lower Tc ratings must be evaluated against application thermal conditions.

On-Resistance Performance: The Rds On (Max) specification determines power dissipation and thermal behavior. Substitutes with equal or lower on-resistance values maintain or improve efficiency characteristics.

Gate Drive Compatibility: Gate threshold voltage (Vgs(th)) and maximum gate voltage (Vgs Max) must align with existing gate drive circuitry. Both the main part and substitute specify Vgs(th) Max of 2.0–2.2V @ 250µA and Vgs Max of ±20V.

Package and Mounting: Surface mount packages in the 8-pin PowerTDFN family (including 8-VSON-CLIP and PG-TDSON-8 variants) are mechanically compatible on standard PCB layouts.

Regulatory Compliance: All parts must maintain ROHS3 compliance and equivalent environmental certifications (REACH Unaffected, EAR99 classification).

The BSC014N04LSIATMA1 (Infineon Technologies OptiMOS™ series) meets these substitution criteria with equivalent voltage rating, compatible gate drive parameters, and surface mount packaging.

Parameter Comparison

Parameter	CSD18512Q5B (TI)	BSC014N04LSIATMA1 (Infineon)	Unit
Manufacturer	Texas Instruments	Infineon Technologies	—
Series	NexFET™	OptiMOS™	—
Drain-to-Source Voltage (Vdss)	40	40	V
Continuous Drain Current (Id) @ Tc	211	100	A
On-Resistance (Rds On Max)	1.6 @ 30A, 10V	1.45 @ 50A, 10V	mOhm
Gate Threshold Voltage (Vgs(th) Max) @ Id	2.2 @ 250µA	2.0 @ 250µA	V
Maximum Gate Voltage (Vgs Max)	±20	±20	V
Input Capacitance (Ciss Max) @ Vds	7120 @ 20V	4000 @ 20V	pF
Power Dissipation (Max) @ Tc	139	96	W
Operating Temperature Range	-55 to 150	-55 to 150	°C (TJ)
Mounting Type	Surface Mount	Surface Mount	—
Package / Case	8-PowerTDFN	8-PowerTDFN	—
Supplier Device Package	8-VSON-CLIP (5x6)	PG-TDSON-8 FL	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	—
Product Status	Active	Active	—

Engineering Selection Recommendations

Voltage and Gate Drive Compatibility: Both the CSD18512Q5B and BSC014N04LSIATMA1 operate at 40V Vdss with compatible gate threshold voltages (2.0–2.2V @ 250µA) and maximum gate voltages (±20V). Existing gate drive circuits designed for the CSD18512Q5B will function with the BSC014N04LSIATMA1 without modification.

Current Rating Considerations: The CSD18512Q5B specifies 211A continuous drain current at case temperature (Tc), while the BSC014N04LSIATMA1 specifies 100A at Tc. Applications requiring the full 211A rating must verify that the BSC014N04LSIATMA1 meets thermal and current requirements under actual operating conditions. The BSC014N04LSIATMA1 is suitable for applications with lower continuous current demands or where thermal management allows operation within its 100A Tc rating.

On-Resistance and Power Dissipation: The BSC014N04LSIATMA1 exhibits lower on-resistance (1.45 mOhm @ 50A, 10V) compared to the CSD18512Q5B (1.6 mOhm @ 30A, 10V), resulting in reduced conduction losses. However, the CSD18512Q5B supports higher power dissipation (139W Tc vs. 96W Tc), reflecting its higher current capability.

Input Capacitance: The BSC014N04LSIATMA1 has lower input capacitance (4000 pF @ 20V vs. 7120 pF @ 20V), which may reduce gate drive power requirements and improve switching speed in high-frequency applications.

Regulatory and Environmental Compliance: Both parts maintain ROHS3 compliance, REACH Unaffected status, and EAR99 classification. Both are classified as MSL 1 (Unlimited moisture sensitivity), ensuring equivalent handling and storage requirements.

Package Compatibility: Both parts use 8-pin PowerTDFN surface mount packages (8-VSON-CLIP and PG-TDSON-8 FL variants). PCB footprints are mechanically compatible, allowing direct physical substitution.

Frequently Asked Questions (FAQ)

Q: Can the BSC014N04LSIATMA1 directly replace the CSD18512Q5B in all applications?

A: Direct replacement is possible when the application's continuous drain current requirement does not exceed 100A at case temperature. The BSC014N04LSIATMA1 is suitable for applications with lower current demands or where thermal management ensures operation within its 100A Tc rating. Applications requiring the full 211A rating of the CSD18512Q5B must use the original part or verify alternative high-current MOSFETs.

Q: Are there gate drive circuit modifications required when substituting the BSC014N04LSIATMA1 for the CSD18512Q5B?

A: No modifications are required. Both parts specify identical maximum gate voltage (±20V) and compatible gate threshold voltages (2.0–2.2V @ 250µA). Existing gate drive circuits will operate without change.

Q: How do the on-resistance specifications compare between these parts?

A: The BSC014N04LSIATMA1 specifies 1.45 mOhm on-resistance at 50A and 10V gate voltage, while the CSD18512Q5B specifies 1.6 mOhm at 30A and 10V. The BSC014N04LSIATMA1 exhibits lower on-resistance, reducing conduction losses in applications within its current rating.

Q: What is the significance of the lower input capacitance in the BSC014N04LSIATMA1?

A: The BSC014N04LSIATMA1 has input capacitance of 4000 pF compared to 7120 pF in the CSD18512Q5B. Lower input capacitance reduces gate drive power consumption and may improve switching speed in high-frequency switching applications.

Q: Are the package footprints identical between the CSD18512Q5B and BSC014N04LSIATMA1?

A: Both parts use 8-pin PowerTDFN surface mount packages. The CSD18512Q5B uses the 8-VSON-CLIP (5x6) variant, while the BSC014N04LSIATMA1 uses the PG-TDSON-8 FL variant. PCB footprints are mechanically compatible, allowing direct physical substitution on standard layouts.

Q: Do both parts meet the same regulatory and environmental standards?

A: Yes. Both the CSD18512Q5B and BSC014N04LSIATMA1 are ROHS3 compliant, REACH Unaffected, classified as EAR99, and rated MSL 1 (Unlimited). Handling, storage, and environmental requirements are equivalent.

Q: What is the primary limitation of the BSC014N04LSIATMA1 as a substitute?

A: The primary limitation is the lower continuous drain current rating (100A at Tc vs. 211A at Tc). Applications requiring sustained currents above 100A must use the CSD18512Q5B or identify alternative high-current MOSFETs rated for 40V operation.

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