STW18NK60Z N-Channel 600V 16A MOSFET Equivalent & Substitute Parts

Part Overview

The STW18NK60Z is an N-Channel 600V 16A MOSFET manufactured by STMicroelectronics in the SuperMESH™ series. This device is rated for 230W power dissipation and is housed in a TO-247-3 through-hole package. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The STW18NK60Z serves in high-voltage switching applications requiring 600V drain-to-source voltage capability with moderate current handling at 16A continuous drain current.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	600	V
Continuous Drain Current (Id) @ 25°C	16	A
Power Dissipation (Max)	230	W
Rds On (Max) @ 8A, 10V	360	mOhm
Gate Charge (Qg) @ 10V	170	nC
Input Capacitance (Ciss) @ 25V	3540	pF
Operating Temperature Range	-55 to 150	°C
Package Type	TO-247-3	Through Hole
FET Type	N-Channel
Technology	MOSFET (Metal Oxide)

Substitute Part Grouping Explanation

Substitution of the STW18NK60Z is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Drain to Source Voltage (Vdss): Must equal or exceed 600V
Continuous Drain Current (Id): Must equal or exceed 16A at 25°C
Package Type: Must be TO-247-3 or compatible TO-247 variant
FET Type: Must be N-Channel
Technology: Must be MOSFET (Metal Oxide)
Operating Temperature Range: Must support -55°C to 150°C

Secondary Compatibility Parameters:

Gate Charge (Qg): Lower values indicate faster switching
On-State Resistance (Rds On): Lower values reduce conduction losses
Input Capacitance (Ciss): Affects gate drive requirements
Power Dissipation: Higher ratings provide design margin

Substitute parts are grouped into two categories: Direct Equivalents (matching 600V/16A specifications) and Enhanced Alternatives (higher voltage or current ratings that maintain backward compatibility).

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Qg (nC)	Ciss (pF)	Power Diss. (W)	Package	Status
STW18NK60Z	STMicroelectronics	600	16	360 @ 8A	170	3540	230	TO-247-3	Obsolete
AOK20N60L	Alpha & Omega Semiconductor	600	20	370 @ 10A	74	3680	417	TO-247-3	Obsolete
IRFP21N60LPBF	Vishay Siliconix	600	21	320 @ 13A	150	4000	330	TO-247-3	Active
IRFPC60LCPBF	Vishay Siliconix	600	16	400 @ 9.6A	120	3500	280	TO-247-3	Active
IRFPC60PBF	Vishay Siliconix	600	16	400 @ 9.6A	210	3900	280	TO-247-3	Active
IXFH18N60P	IXYS	600	18	400 @ 500mA	50	2500	360	TO-247-3	Active
APT24M80B	Microchip Technology	800	25	390 @ 12A	150	4595	625	TO-247-3	Active
IXTH12N65X2	IXYS	650	12	300 @ 6A	17	1100	180	TO-247-3	Active

Engineering Selection Recommendations

Direct Equivalents (600V, 16A Class):

IRFPC60LCPBF and IRFPC60PBF are pin-compatible direct substitutes for the STW18NK60Z. Both are manufactured by Vishay Siliconix, maintain identical 600V/16A ratings, and are housed in TO-247-3 packages. IRFPC60LCPBF is ROHS3 compliant with lower gate charge (120 nC), while IRFPC60PBF offers ROHS3 compliance with standard gate charge (210 nC). Both parts are currently in active production status.

Enhanced Current Rating (600V, 20A+):

AOK20N60L (Alpha & Omega Semiconductor) and IRFP21N60LPBF (Vishay Siliconix) provide higher continuous drain current ratings (20A and 21A respectively) while maintaining 600V voltage rating. These parts offer improved thermal performance and design margin. IRFP21N60LPBF is currently active and ROHS3 compliant. AOK20N60L is obsolete but remains in inventory. Both are suitable for applications where higher current capacity is beneficial.

Enhanced Voltage Rating (800V, 25A):

APT24M80B (Microchip Technology, POWER MOS 8™ series) provides higher voltage (800V) and current (25A) ratings in an active product status. This part is suitable for designs requiring additional voltage margin or higher power dissipation capability (625W). The higher Vdss rating ensures compatibility with applications subject to voltage transients.

Lower Current Alternative (650V, 12A):

IXTH12N65X2 (IXYS, Ultra X2 series) offers a 650V rating with reduced current capability (12A). This part is not recommended as a direct substitute due to lower current rating but may be considered for applications with reduced current requirements.

Compliance and Availability:

IRFPC60LCPBF, IRFPC60PBF, IRFP21N60LPBF, IXFH18N60P, and APT24M80B are all ROHS3 compliant and currently in active production. These parts are preferred for new designs and ongoing production support. All substitute parts maintain the same operating temperature range (-55°C to 150°C) and through-hole TO-247-3 mounting configuration.

Frequently Asked Questions (FAQ)

Q: Can IRFPC60LCPBF directly replace STW18NK60Z in existing designs?

A: Yes. IRFPC60LCPBF is a direct pin-compatible substitute with identical 600V/16A ratings, TO-247-3 package, and operating temperature range. The lower gate charge (120 nC vs. 170 nC) may improve switching speed in gate-drive-limited applications.

Q: What is the difference between IRFPC60LCPBF and IRFPC60PBF?

A: Both parts are 600V/16A MOSFETs in TO-247-3 packages with identical electrical ratings. IRFPC60LCPBF features lower gate charge (120 nC) and input capacitance (3500 pF), while IRFPC60PBF has higher gate charge (210 nC) and input capacitance (3900 pF). Both are ROHS3 compliant and active products.

Q: Is IRFP21N60LPBF suitable as a substitute?

A: Yes. IRFP21N60LPBF maintains the 600V voltage rating and TO-247-3 package while providing higher continuous drain current (21A vs. 16A). This part offers improved thermal performance and is currently in active production with ROHS3 compliance.

Q: Why is APT24M80B listed as a substitute if it has 800V rating?

A: APT24M80B is listed as an enhanced alternative for applications where higher voltage margin is required. The 800V rating provides protection against voltage transients while maintaining backward compatibility. The higher current rating (25A) and power dissipation (625W) offer additional design margin. This part is suitable only if the application circuit can accommodate the higher voltage rating.

Q: Can I use IXFH18N60P as a substitute?

A: Yes. IXFH18N60P is a 600V/18A MOSFET in TO-247-3 package with active product status and ROHS3 compliance. The slightly higher current rating (18A vs. 16A) and significantly lower gate charge (50 nC vs. 170 nC) make it suitable for applications where faster switching is beneficial.

Q: What does the TO-247-3 package designation mean?

A: TO-247-3 is a through-hole package with three leads (Gate, Drain, Source) commonly used for power MOSFETs. All substitute parts listed maintain this package type, ensuring mechanical and electrical compatibility with existing PCB layouts and socket designs.

Q: Are all substitute parts ROHS3 compliant?

A: IRFPC60LCPBF, IRFPC60PBF, IRFP21N60LPBF, IXFH18N60P, and APT24M80B are all ROHS3 compliant. AOK20N60L is ROHS3 compliant but obsolete. IXTH12N65X2 is ROHS3 compliant but not recommended as a direct substitute due to lower current rating.

Q: What is the significance of gate charge (Qg) differences?

A: Gate charge determines the energy required to switch the MOSFET on and off. Lower gate charge (IXFH18N60P at 50 nC) enables faster switching and reduced gate drive power. Higher gate charge (STW18NK60Z at 170 nC) requires more gate drive energy but may offer other performance benefits. Selection depends on gate driver capability and switching frequency requirements.

Q: Can I use a higher-rated part in place of the STW18NK60Z?

A: Yes, provided the higher-rated part maintains the same or lower on-state resistance and is compatible with the gate drive circuit. Parts with higher current ratings (AOK20N60L, IRFP21N60LPBF) or voltage ratings (APT24M80B) are backward compatible and provide additional design margin.

Q: What is the difference between obsolete and active product status?

A: Active products are currently manufactured and supported by the supplier with guaranteed availability. Obsolete products are no longer manufactured but may remain in inventory. For new designs and long-term production, active products (IRFPC60LCPBF, IRFPC60PBF, IRFP21N60LPBF, IXFH18N60P, APT24M80B) are recommended.

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