FCB20N60FTM N-Channel 600V 20A MOSFET Equivalent & Substitute Parts

Part Overview

The FCB20N60FTM is an N-Channel 600V 20A MOSFET manufactured by onsemi in the SuperFET™ series, housed in a TO-263 (D2PAK) surface mount package. This device is rated for continuous drain current of 20A at 25°C with a maximum power dissipation of 208W. The part is currently classified as Not For New Designs, making identification of equivalent and substitute components essential for ongoing production support and design alternatives.

Substitute parts are necessary to maintain supply chain flexibility, support legacy designs, and provide alternatives when the primary component becomes unavailable or reaches end-of-life status.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Drain to Source Voltage (Vdss)	600	V
Continuous Drain Current (Id) @ 25°C	20	A
Drive Voltage (Max Rds On)	10	V
Rds On (Max) @ 10A, 10V	190	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	5	V
Gate Charge (Qg) @ 10V	98	nC
Input Capacitance (Ciss) @ 25V	3080	pF
Power Dissipation (Max)	208	W
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package	TO-263 (D2PAK)	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the FCB20N60FTM is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria:

FET Type: N-Channel
Drain to Source Voltage (Vdss): 600V minimum
Continuous Drain Current (Id): 20A minimum at 25°C
Drive Voltage: 10V
Mounting Type: Surface Mount
Package: TO-263 (D2PAK) or compatible variants
Operating Temperature Range: -55°C to 150°C minimum
RoHS3 Compliance and MSL Level 1

Secondary Compatibility Parameters:

Rds On (Max) @ 10A, 10V: 190mOhm to 200mOhm range
Gate Threshold Voltage: 4V to 5V range
Gate Charge: Acceptable range 19.8nC to 98nC
Input Capacitance: Acceptable range 1038pF to 3080pF

Parts are grouped into two categories:

Category A - Direct Equivalents (600V, 20A): AOB20S60L, STB26NM60N, R6020KNJTL, R6020ENJTL

Category B - Higher Performance Alternatives (600V-650V, 20A-24A): IXTA20N65X2, IXTA24N65X2, R6024ENJTL, R6024KNJTL, IXFA18N65X2, STB24N60DM2

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On Max @ 10A, 10V (mOhm)	Vgs(th) @ 250µA (V)	Qg @ 10V (nC)	Ciss @ 25V (pF)	Power Diss. (W)	Package	Status
FCB20N60FTM	onsemi	600	20	190	5	98	3080	208	TO-263	Not For New Designs
AOB20S60L	Alpha & Omega	600	20	199	4.1	19.8	1038	266	TO-263	Active
IXFA18N65X2	IXYS	650	18	200	5	29	1520	290	TO-263	Active
IXTA20N65X2	IXYS	650	20	185	4.5	27	1450	290	TO-263	Active
IXTA24N65X2	IXYS	650	24	145	5	36	2060	390	TO-263AA	Active
R6020ENJTL	Rohm	600	20	196	4	60	1400	40	LPTS	Active
R6020KNJTL	Rohm	600	20	196	5	40	1550	231	LPTS	Active
R6024ENJTL	Rohm	600	24	165	4	70	1650	40	LPTS	Active
R6024KNJTL	Rohm	600	24	165	5	45	2000	245	LPTS	Active
STB24N60DM2	STMicroelectronics	600	18	200	5	29	1055	150	TO-263	Active
STB26NM60N	STMicroelectronics	600	20	165	4	60	1800	140	TO-263	Active

Engineering Selection Recommendations

Direct Replacement (Highest Compatibility):

AOB20S60L and STB26NM60N are the primary direct replacements for FCB20N60FTM. Both devices maintain 600V Vdss rating, 20A continuous drain current, and TO-263 package compatibility. AOB20S60L offers improved power dissipation (266W vs. 208W) with lower gate charge (19.8nC vs. 98nC), resulting in faster switching characteristics. STB26NM60N provides superior Rds On performance (165mOhm vs. 190mOhm) and lower power dissipation (140W), making it suitable for applications requiring reduced conduction losses. Both parts are Active status with full RoHS3 compliance and MSL Level 1 rating.

Higher Current Alternatives (24A Rating):

R6024KNJTL and IXTA24N65X2 provide increased current handling capability (24A vs. 20A) while maintaining or exceeding voltage specifications. R6024KNJTL operates at 600V with 245W power dissipation and 165mOhm Rds On. IXTA24N65X2 offers 650V rating with superior Rds On performance (145mOhm) and higher power dissipation (390W), suitable for demanding thermal environments. Both are Active status with full compliance certifications.

Voltage-Enhanced Alternatives (650V Rating):

IXTA20N65X2 and IXFA18N65X2 provide 650V Vdss rating for applications requiring higher voltage margin. IXTA20N65X2 matches the 20A current rating with improved Rds On (185mOhm) and 290W power dissipation. IXFA18N65X2 operates at 18A with comparable performance characteristics. Both are Active status with full compliance.

Selection Basis:

All recommended substitutes maintain RoHS3 compliance and MSL Level 1 rating. Active status parts ensure ongoing manufacturing support and availability. Package compatibility (TO-263 variants) ensures mechanical fit in existing PCB layouts. Voltage and current ratings meet or exceed FCB20N60FTM specifications, ensuring functional compatibility in circuit applications.

Frequently Asked Questions (FAQ)

Q: Can AOB20S60L directly replace FCB20N60FTM in existing designs?

A: Yes. AOB20S60L maintains identical voltage (600V), current (20A), and package (TO-263) specifications. The lower gate charge (19.8nC vs. 98nC) results in faster switching response, which is generally beneficial. Verify gate drive circuit compatibility with the lower threshold voltage (4.1V vs. 5V) if using marginal drive voltages.

Q: What is the difference between TO-263 and LPTS packages?

A: Both are surface mount packages with identical electrical performance and pin configuration. TO-263 (D2PAK) and LPTS are mechanical variants of the same package family. PCB footprints are compatible. Verify specific package designation in design documentation before substitution.

Q: Are Rohm R6020 and R6024 series suitable replacements?

A: R6020KNJTL and R6024KNJTL are suitable for applications requiring 600V, 20A-24A operation. The LPTS package is mechanically compatible with TO-263 footprints. R6020ENJTL and R6024ENJTL have reduced power dissipation (40W) and limited operating temperature range (maximum 150°C only, no minimum specification), making them suitable only for applications not requiring full -55°C to 150°C range.

Q: Can I use IXTA24N65X2 as a drop-in replacement?

A: IXTA24N65X2 is functionally compatible but not a true drop-in replacement. The TO-263AA package variant may have different thermal characteristics. The 650V rating provides voltage margin. The 24A rating and 145mOhm Rds On offer improved performance. Verify PCB footprint compatibility and thermal management requirements before substitution.

Q: What are the key differences between 600V and 650V rated devices?

A: 650V devices (IXTA20N65X2, IXTA24N65X2, IXFA18N65X2) provide 50V additional voltage margin above the 600V specification. This margin is beneficial in applications with voltage transients or overshoot conditions. All other electrical characteristics remain within acceptable substitution ranges. No circuit modifications are required for 650V substitutes in 600V applications.

Q: How do gate charge differences affect circuit performance?

A: Gate charge (Qg) ranges from 19.8nC (AOB20S60L) to 98nC (FCB20N60FTM). Lower gate charge enables faster switching transitions and reduced gate drive power consumption. Higher gate charge requires longer drive pulse duration. Verify gate drive circuit can supply required charge within specified time intervals. Most modern gate drivers accommodate this range without modification.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain RoHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the original FCB20N60FTM specifications. All parts are suitable for lead-free soldering processes and meet environmental compliance requirements.

Q: What is the significance of Active vs. Not For New Designs status?

A: FCB20N60FTM is classified as Not For New Designs, indicating onsemi is discontinuing this product line. Active status parts (all substitutes listed) are in current production with guaranteed long-term availability. Active status ensures supply chain continuity and ongoing manufacturer support for new designs and production runs.

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