BSC032N03S Equivalent & Substitute Parts

Part Overview

The BSC032N03S is an N-Channel 30V MOSFET manufactured by Infineon Technologies in the OptiMOS™ series. This device is rated for 23A continuous drain current at 25°C (Ta) and 100A at case temperature (Tc), with a maximum drain-source voltage of 30V. The part is housed in a PG-TDSON-8-1 surface mount package and features a maximum on-resistance of 3.2mOhm at 50A and 10V gate-source voltage.

The BSC032N03S is currently discontinued at DiGi Electronics. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for production and repair applications. Substitute parts must maintain compatibility across critical electrical parameters including drain-source voltage, continuous drain current ratings, on-resistance characteristics, and gate charge specifications.

Key Parameters

Parameter	BSC032N03S Value	Unit
Drain to Source Voltage (Vdss)	30	V
Current - Continuous Drain @ 25°C (Ta)	23	A
Current - Continuous Drain @ Case Temp (Tc)	100	A
Rds On (Max) @ Id, Vgs	3.2 mOhm @ 50A, 10V	mOhm
Gate Charge (Qg) @ Vgs	39 nC @ 5V	nC
Vgs(th) (Max) @ Id	2 V @ 70µA	V
Input Capacitance (Ciss) @ Vds	5080 pF @ 15V	pF
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	-
Package / Case	8-PowerTDFN	-

Substitute Part Grouping Explanation

Substitution of the BSC032N03S is determined by the following critical parameters:

Voltage Rating: All substitute parts must maintain a Drain to Source Voltage (Vdss) of 30V to ensure safe operation within the same circuit topology.

Continuous Drain Current: Substitute parts must support a minimum continuous drain current of 23A at 25°C (Ta) and 100A at case temperature (Tc) to meet or exceed the original part's current handling capability.

On-Resistance (Rds On): The maximum on-resistance specification determines power dissipation and thermal performance. Substitute parts with equal or lower Rds On values are acceptable.

Gate Charge (Qg): Gate charge affects switching speed and driver circuit requirements. Substitute parts with comparable or lower gate charge values maintain circuit performance.

Package Compatibility: All substitute parts use 8-pin surface mount packages (8-PowerTDFN, 8-VSONP, or 8-HSOP) with compatible pinouts for direct board-level substitution.

Operating Temperature Range: All substitute parts support the -55°C to 150°C operating temperature range.

The following substitute parts are grouped by their electrical compatibility with the BSC032N03S:

Group 1 - Direct Electrical Equivalents (Vdss 30V, Id 23-24A @ Ta, 100A @ Tc):

CSD17553Q5A (Texas Instruments NexFET™)
CSD17306Q5A (Texas Instruments NexFET™)
RS1E240GNTB (Rohm Semiconductor)

Group 2 - Enhanced Performance Alternatives (Vdss 30V, Id ≥ 24A @ Ta, 100A @ Tc):

CSD17301Q5A (Texas Instruments NexFET™, 28A @ Ta)
CSD17501Q5A (Texas Instruments NexFET™, 100A @ Tc only)

Group 3 - Lower Current Alternative (Vdss 30V, Id 21A @ Ta, 42A @ Tc):

FDMS7670 (Fairchild Semiconductor PowerTrench®)

Parameter Comparison

Parameter	BSC032N03S	CSD17553Q5A	CSD17306Q5A	CSD17301Q5A	CSD17501Q5A	RS1E240GNTB	FDMS7670
Manufacturer	Infineon	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Rohm	Fairchild
Vdss (V)	30	30	30	30	30	30	30
Id @ Ta (A)	23	23.5	24	28	-	24	21
Id @ Tc (A)	100	100	100	100	100	72	42
Rds On (mOhm)	3.2 @ 50A, 10V	3.1 @ 20A, 10V	3.7 @ 22A, 8V	2.6 @ 25A, 8V	2.9 @ 25A, 10V	3.3 @ 24A, 10V	3.8 @ 21A, 10V
Qg (nC)	39 @ 5V	21.5 @ 4.5V	15.3 @ 4.5V	25 @ 4.5V	17 @ 4.5V	23 @ 10V	56 @ 10V
Vgs(th) (V)	2 @ 70µA	1.9 @ 250µA	1.6 @ 250µA	1.55 @ 250µA	1.8 @ 250µA	2.5 @ 1mA	3 @ 250µA
Ciss (pF)	5080 @ 15V	3252 @ 15V	2170 @ 15V	3480 @ 15V	2630 @ 15V	1500 @ 15V	4105 @ 15V
Operating Temp (°C)	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150
Package	8-PowerTDFN	8-VSONP (5x6)	8-VSONP (5x6)	8-VSONP (5x6)	8-VSONP (5x6)	8-HSOP	8-PQFN (5x6)
Product Status	Discontinued	Active	Active	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement):

CSD17553Q5A, CSD17306Q5A, and RS1E240GNTB are the primary substitute options. These parts maintain electrical compatibility with the BSC032N03S across all critical parameters: 30V Vdss rating, 23-24A continuous drain current at 25°C, and 100A or higher at case temperature. All three are currently in active production status with RoHS3 compliance, addressing the regulatory limitations of the discontinued BSC032N03S.

CSD17553Q5A offers the closest electrical match with 23.5A at Ta and 100A at Tc, combined with lower gate charge (21.5 nC) and input capacitance (3252 pF) compared to the original part. This results in improved switching characteristics and reduced driver circuit stress.

CSD17306Q5A provides equivalent current ratings with the lowest gate charge specification (15.3 nC) among direct equivalents, enabling faster switching operation. The reduced input capacitance (2170 pF) further improves circuit efficiency.

RS1E240GNTB from Rohm Semiconductor delivers 24A at Ta with RoHS3 compliance. The 8-HSOP package differs from the original 8-PowerTDFN, requiring PCB layout verification for pin compatibility and thermal performance.

Enhanced Performance Alternative:

CSD17301Q5A offers superior on-resistance performance (2.6 mOhm at 25A, 8V) and higher continuous drain current (28A at Ta), providing design margin for applications requiring enhanced current handling. This part is suitable for designs where improved thermal performance justifies the higher gate charge specification (25 nC).

High Current Capability Alternative:

CSD17501Q5A is optimized for maximum case temperature current (100A at Tc) with the lowest on-resistance among all substitutes (2.9 mOhm at 25A, 10V). This part lacks a Ta rating and is suitable only for applications where continuous drain current is specified at case temperature.

Lower Current Applications:

FDMS7670 from Fairchild Semiconductor is suitable only for applications where the continuous drain current requirement does not exceed 21A at 25°C or 42A at case temperature. The higher gate charge (56 nC) and input capacitance (4105 pF) increase driver circuit demands. This part should be selected only when current requirements are confirmed below the specified limits.

Frequently Asked Questions (FAQ)

Q: Can CSD17553Q5A directly replace BSC032N03S on the PCB?

A: CSD17553Q5A uses an 8-VSONP (5x6) package versus the original 8-PowerTDFN. Both are 8-pin surface mount packages with compatible pinouts. PCB footprint verification is required to confirm pad layout compatibility. The packages have similar thermal characteristics and mounting requirements.

Q: What is the difference between Ta and Tc current ratings?

A: Ta (ambient temperature) current rating is measured at 25°C ambient temperature and represents continuous drain current under standard laboratory conditions. Tc (case temperature) current rating is measured at the device case temperature and represents the maximum current the device can sustain when mounted on a PCB with specified thermal conditions. Tc ratings are typically higher due to improved heat dissipation through the PCB.

Q: Why does CSD17301Q5A have different gate voltage specifications (±10V / -8V) compared to BSC032N03S (±20V)?

A: CSD17301Q5A specifies Vgs (Max) as +10V and -8V, while BSC032N03S specifies ±20V. This indicates CSD17301Q5A has a narrower safe operating gate voltage range. Circuit designs must ensure gate drive voltage does not exceed these limits. If the original design applies gate voltages outside the ±10V / -8V range, CSD17301Q5A is not suitable.

Q: Is FDMS7670 suitable for my application?

A: FDMS7670 is suitable only if your application requires continuous drain current not exceeding 21A at 25°C ambient temperature or 42A at case temperature. If your design requires the full 23A at Ta or 100A at Tc capability of the BSC032N03S, FDMS7670 will not meet performance requirements.

Q: What is the impact of lower gate charge on circuit design?

A: Lower gate charge (Qg) reduces the charge that must be supplied by the gate driver circuit, resulting in faster switching transitions and reduced driver power dissipation. CSD17306Q5A (15.3 nC) and CSD17501Q5A (17 nC) require less gate drive energy than BSC032N03S (39 nC). Existing gate driver circuits will operate with improved efficiency and faster switching speed.

Q: Are all substitute parts RoHS compliant?

A: CSD17553Q5A, CSD17306Q5A, CSD17301Q5A, and CSD17501Q5A are ROHS3 compliant. RS1E240GNTB is ROHS3 compliant. FDMS7670 RoHS status is not specified in available documentation. If RoHS compliance is a design requirement, confirm FDMS7670 compliance with the manufacturer before selection.

Q: Can I use CSD17501Q5A if my circuit only specifies case temperature current?

A: CSD17501Q5A is rated for 100A at case temperature (Tc) only, with no Ta rating provided. This part is suitable for applications where continuous drain current is specified exclusively at case temperature. If your design requires a Ta rating for ambient temperature operation, CSD17553Q5A or CSD17306Q5A are more appropriate selections.

Q: What is the significance of input capacitance (Ciss) differences?

A: Input capacitance affects gate charge requirements and switching speed. Lower Ciss values reduce the total charge needed to switch the device and enable faster switching transitions. CSD17306Q5A (2170 pF) has significantly lower Ciss than BSC032N03S (5080 pF), resulting in faster switching and reduced gate driver stress. Higher Ciss values, such as FDMS7670 (4105 pF), require more gate drive energy.

Q: Do all substitute parts fit the same PCB footprint?

A: CSD17553Q5A, CSD17306Q5A, CSD17301Q5A, and CSD17501Q5A use 8-VSONP (5x6) packages with compatible pinouts. RS1E240GNTB uses 8-HSOP package. FDMS7670 uses 8-PQFN (5x6) package. While all are 8-pin surface mount devices, physical dimensions and pad layouts differ. PCB footprint verification is required for each substitute part before implementation.

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