APT5018BLLG Equivalent & Substitute Parts

Part Overview

The APT5018BLLG is an N-Channel 500V 27A power MOSFET manufactured by Microchip Technology in the POWER MOS 7® series. This device is housed in a TO-247 [B] through-hole package and is rated for 300W maximum power dissipation at the case temperature. The part is currently classified as obsolete, making identification of equivalent and substitute components essential for design continuity and procurement planning.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	500	V
Continuous Drain Current (Id) @ 25°C	27	A
On-State Resistance (Rds On) @ 13.5A, 10V	180	mOhm
Gate Threshold Voltage (Vgs(th)) @ 1mA	5	V
Gate Charge (Qg) @ 10V	58	nC
Maximum Gate Voltage (Vgs)	±30	V
Input Capacitance (Ciss) @ 25V	2596	pF
Power Dissipation (Max)	300	W
Operating Temperature Range	-55 to 150	°C
Package Type	TO-247-3	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution of the APT5018BLLG is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Drain to Source Voltage (Vdss): 500V (exact match required)
Continuous Drain Current (Id): 27A or greater
On-State Resistance (Rds On): 180mOhm or lower for equivalent performance
Gate Threshold Voltage (Vgs(th)): 4.5V to 6.5V range
Maximum Gate Voltage (Vgs): ±20V or ±30V
Package Type: TO-247 variants (TO-247, TO-247-3, TO-247AD, ISOPLUS247™, PLUS247™-3)
Mounting Type: Through Hole

Substitution Logic: Substitute parts must maintain the 500V Vdss rating and support continuous drain current at or above 27A. On-state resistance values within ±20% of the original specification ensure comparable thermal performance and switching characteristics. Gate charge and input capacitance variations are acceptable within the ranges provided, as these affect gate drive requirements but do not prevent functional substitution. Package variants within the TO-247 family are mechanically compatible with standard TO-247 footprints.

Parameter Comparison

Parameter	APT5018BLLG	IXFH30N50Q3	IXFH36N50P	IXFH42N50P2	IXFR44N50Q3	IXTH30N50L	IXTH30N50P	IXTH36N50P	IXTH40N50L2	IXTX46N50L	STW28NM50N
Vdss (V)	500	500	500	500	500	500	500	500	500	500	500
Id @ 25°C (A)	27	30	36	42	25	30	30	36	40	46	21
Rds On (mOhm)	180	200	170	145	154	200	200	170	170	160	158
Vgs(th) (V)	5	6.5	5	4.5	6.5	4.5	5	5	4.5	6	4
Qg @ 10V (nC)	58	62	93	92	93	240	70	85	320	260	50
Vgs Max (V)	±30	±20	±30	±30	±30	±20	±30	±30	±20	±30	±25
Ciss @ 25V (pF)	2596	3200	5500	5300	4800	10200	4150	5500	10400	7000	1735
Power Dissipation (W)	300	690	540	830	300	400	460	540	540	700	150
Operating Temp (°C)	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150
Package	TO-247 [B]	TO-247AD	TO-247AD	TO-247AD	ISOPLUS247™	TO-247	TO-247	TO-247	TO-247	PLUS247™-3	TO-247-3
Product Status	Obsolete	Active	Active	Last Time Buy	Active	Active	Active	Active	Active	Active	Active
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (Highest Compatibility):

IXFR44N50Q3 is the closest functional equivalent to the APT5018BLLG. Both devices share identical 500V Vdss rating, comparable continuous drain current (25A vs. 27A), and matching 300W power dissipation. The IXFR44N50Q3 features lower on-state resistance (154mOhm vs. 180mOhm), resulting in reduced conduction losses. This part is currently in active production status with ROHS3 compliance and is available in high inventory quantities (1047 pcs).

Primary Substitutes (Electrical Compatibility with Enhanced Performance):

IXTH30N50P and IXTH30N50L both provide 30A continuous drain current with 500V Vdss rating. The IXTH30N50P (Polar series) offers 460W power dissipation and 200mOhm on-state resistance, with active product status and ROHS3 compliance. The IXTH30N50L (Linear series) provides 400W power dissipation with identical on-state resistance. Both are mechanically compatible with TO-247 footprints.

IXTH36N50P delivers 36A continuous drain current with 540W power dissipation and 170mOhm on-state resistance, providing performance margin above the original specification. This part is actively produced with ROHS3 compliance.

Higher Current Alternatives (For Thermal Margin Applications):

IXTH40N50L2 (40A, 540W) and IXFH42N50P2 (42A, 830W) provide increased current handling capacity with reduced on-state resistance. The IXFH42N50P2 is designated as Last Time Buy, indicating limited future availability. IXTX46N50L (46A, 700W) offers the highest current rating in the substitute group with active product status.

Lower Current Alternative:

STW28NM50N provides 21A continuous drain current, below the original 27A specification. This part is suitable only for applications where the 27A rating is not fully utilized. It features the lowest input capacitance (1735pF) and lowest power dissipation (150W) in the substitute group, with active product status and high inventory availability (15210 pcs).

Compliance and Availability:

All substitute parts maintain ROHS3 compliance and REACH unaffected status. All operate within the -55°C to 150°C temperature range. Package variants (TO-247, TO-247AD, ISOPLUS247™, PLUS247™-3) are mechanically compatible with standard TO-247 mounting footprints. Inventory availability ranges from 888 to 15210 units across the substitute group.

Frequently Asked Questions (FAQ)

Q: Can IXFR44N50Q3 directly replace APT5018BLLG without circuit modification?

A: IXFR44N50Q3 is electrically compatible as a direct replacement. Both devices share 500V Vdss, comparable current ratings (25A vs. 27A), and identical 300W power dissipation. The ISOPLUS247™ package is mechanically compatible with TO-247 [B] footprints. No circuit modifications are required for functional substitution.

Q: What is the difference between TO-247, TO-247AD, and ISOPLUS247™ packages?

A: All three are through-hole TO-247 family variants with identical pin configurations and mechanical compatibility. TO-247AD and ISOPLUS247™ are enhanced versions with improved thermal and electrical isolation characteristics. Standard TO-247 footprints accommodate all three package types without modification.

Q: Why does IXTH40N50L2 have higher gate charge (320nC) than APT5018BLLG (58nC)?

A: Gate charge correlates with input capacitance and die size. IXTH40N50L2 is rated for 40A continuous current versus 27A for APT5018BLLG, requiring a larger die and higher capacitance. Higher gate charge requires proportionally higher gate drive current but does not prevent functional substitution. Gate drive circuits must be verified for adequate current sourcing capability.

Q: Is STW28NM50N suitable as a substitute if my application only requires 20A?

A: STW28NM50N is rated for 21A continuous drain current, which meets a 20A application requirement. However, this part provides no current margin above the application demand. For applications designed around the 27A APT5018BLLG rating, STW28NM50N is not recommended due to insufficient current headroom.

Q: What is the significance of "Last Time Buy" status for IXFH42N50P2?

A: Last Time Buy designation indicates the manufacturer has announced end-of-life production. Existing inventory is available for purchase, but no future production is planned. For long-term design continuity, IXFH42N50P2 should not be selected for new designs. Alternative parts with Active status (IXTH40N50L2, IXTX46N50L) are recommended for new applications.

Q: Can I use IXTH36N50P in a design originally specified for APT5018BLLG?

A: IXTH36N50P is electrically compatible with 500V Vdss, 36A continuous current (exceeding 27A requirement), and 540W power dissipation (exceeding 300W requirement). On-state resistance is 170mOhm versus 180mOhm, resulting in lower conduction losses. Gate charge (85nC) is higher than APT5018BLLG (58nC), requiring verification of gate drive circuit capability. Mechanical compatibility is confirmed for TO-247 footprints.

Q: What thermal considerations apply when substituting with higher-rated devices?

A: Substitute parts with higher power dissipation ratings (IXFH30N50Q3 at 690W, IXFH42N50P2 at 830W) provide thermal margin but do not require circuit modification. Actual power dissipation is determined by application current and on-state resistance. Lower on-state resistance in substitute parts reduces conduction losses, potentially lowering junction temperature. Thermal design should be verified based on actual application current and duty cycle.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed are ROHS3 compliant. APT5018BLLG RoHS status is not specified in the provided data. Verification with the original manufacturer is recommended if RoHS compliance is a procurement requirement.

Q: What is the impact of different Vgs(th) values across substitute parts?

A: Gate threshold voltage ranges from 4V (STW28NM50N) to 6.5V (IXFH30N50Q3, IXFR44N50Q3). All values fall within the standard gate drive voltage range of 10V to 15V. Gate drive circuits designed for APT5018BLLG (5V Vgs(th)) are compatible with substitute parts. Threshold voltage variation does not prevent functional substitution in standard gate drive applications.

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