IRLIB9343 P-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The IRLIB9343 is a P-Channel MOSFET manufactured by Infineon Technologies, rated for 55V drain-to-source voltage and 14A continuous drain current in a Through Hole TO-220AB Full-Pak package. This device is classified as obsolete, making identification of functionally equivalent substitute components necessary for ongoing design support and production continuity. The HEXFET® series device is suitable for applications requiring moderate voltage and current switching in power management circuits.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	55	V
Continuous Drain Current (Id) @ 25°C	14	A
On-State Resistance (Rds On Max) @ 10V	105	mOhm
Gate Threshold Voltage (Vgs th Max) @ 250µA	1	V
Gate Charge (Qg Max) @ 10V	47	nC
Power Dissipation (Max)	33	W
Operating Temperature Range	-40 to 175	°C
Package Type	TO-220AB Full-Pak	Through Hole
FET Type	P-Channel
Technology	MOSFET (Metal Oxide)

Substitute Part Grouping Explanation

Substitute components for the IRLIB9343 are identified based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

FET Type: P-Channel configuration
Package Type: Through Hole TO-220-3 mounting (compatible with TO-220AB footprint)
Drain-to-Source Voltage (Vdss): Equal to or greater than 55V
Continuous Drain Current (Id): Equal to or greater than 14A
Gate Drive Voltage: Compatible with 10V gate drive specification
Operating Temperature Range: Minimum -40°C to 175°C coverage

Substitute Parts Identified:

IRFI9540GPBF (Vishay Siliconix) – Primary substitute with enhanced specifications
IRFI9530GPBF (Vishay Siliconix) – Alternative substitute with reduced current rating

Both substitute parts meet or exceed the voltage and current requirements of the IRLIB9343 while maintaining P-Channel MOSFET topology and Through Hole TO-220-3 package compatibility.

Parameter Comparison

Parameter	IRLIB9343 (Main)	IRFI9540GPBF (Substitute)	IRFI9530GPBF (Substitute)	Unit
FET Type	P-Channel	P-Channel	P-Channel
Technology	MOSFET (Metal Oxide)	MOSFET (Metal Oxide)	MOSFET (Metal Oxide)
Drain to Source Voltage (Vdss)	55	100	100	V
Continuous Drain Current (Id) @ 25°C	14	11	7.7	A
Rds On (Max) @ 10V	105	200	300	mOhm
Gate Threshold Voltage (Vgs th Max) @ 250µA	1	4	4	V
Gate Charge (Qg Max) @ 10V	47	61	38	nC
Power Dissipation (Max)	33	48	42	W
Operating Temperature Range	-40 to 175	-55 to 175	-55 to 175	°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-220AB Full-Pak	TO-220-3 Full Pack, Isolated Tab	TO-220-3 Full Pack, Isolated Tab
Vgs (Max)	±20	±20	±20	V
Product Status	Obsolete	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

IRFI9540GPBF Selection Criteria:

The IRFI9540GPBF is the primary recommended substitute for the IRLIB9343. This Vishay Siliconix component provides active product status with ROHS3 compliance, addressing the obsolescence of the original part. The IRFI9540GPBF exceeds the voltage specification (100V vs. 55V) and approaches the current specification (11A vs. 14A). The higher gate charge (61 nC vs. 47 nC) and increased on-state resistance (200 mOhm vs. 105 mOhm) represent trade-offs inherent to the higher voltage rating. The extended operating temperature range (-55°C to 175°C) provides additional margin beyond the original specification.

IRFI9530GPBF Selection Criteria:

The IRFI9530GPBF serves as an alternative substitute when current requirements are reduced or when lower on-state resistance is prioritized. This part offers the lowest on-state resistance (300 mOhm) among the substitutes, though at reduced current capacity (7.7A). The lower gate charge (38 nC) may benefit applications with limited gate drive capability. ROHS3 compliance and active product status are maintained.

Compliance Considerations:

Both substitute parts are ROHS3 compliant and REACH unaffected, addressing regulatory requirements not met by the obsolete IRLIB9343. Selection between IRFI9540GPBF and IRFI9530GPBF depends on circuit current requirements and thermal management capacity.

Frequently Asked Questions (FAQ)

Q: Can the IRFI9540GPBF directly replace the IRLIB9343 in existing designs?

A: The IRFI9540GPBF is mechanically and electrically compatible with the IRLIB9343 in TO-220 through-hole applications. Both devices feature P-Channel MOSFET topology, ±20V gate voltage rating, and TO-220-3 package compatibility. The higher voltage rating (100V vs. 55V) and increased power dissipation capability (48W vs. 33W) provide design margin. However, the reduced continuous drain current (11A vs. 14A) and increased on-state resistance (200 mOhm vs. 105 mOhm) must be evaluated against circuit requirements.

Q: What are the key differences between IRFI9540GPBF and IRFI9530GPBF?

A: The IRFI9540GPBF provides higher continuous drain current (11A vs. 7.7A) and lower on-state resistance (200 mOhm vs. 300 mOhm), making it suitable for higher current applications. The IRFI9530GPBF offers lower gate charge (38 nC vs. 61 nC) and lower on-state resistance at its rated current, beneficial for gate-drive-limited or efficiency-critical designs. Both maintain identical voltage ratings (100V) and temperature ranges (-55°C to 175°C).

Q: Are there package compatibility concerns when substituting the IRLIB9343?

A: The IRLIB9343 uses TO-220AB Full-Pak packaging, while both substitute parts use TO-220-3 Full Pack with isolated tab. The TO-220-3 package is mechanically compatible with standard TO-220AB footprints. The isolated tab feature in the substitute parts provides improved thermal performance. Pin configuration remains identical for P-Channel MOSFETs in this package family.

Q: How do the on-state resistance differences affect circuit performance?

A: The IRLIB9343 specifies 105 mOhm on-state resistance at 10V gate drive, while IRFI9540GPBF specifies 200 mOhm and IRFI9530GPBF specifies 300 mOhm. Higher on-state resistance increases conduction losses proportionally to the square of drain current. In applications operating at or near the 14A specification of the IRLIB9343, the increased resistance of substitute parts will result in higher power dissipation. Thermal design must account for this difference.

Q: What is the significance of the gate threshold voltage difference?

A: The IRLIB9343 specifies gate threshold voltage of 1V at 250µA, while both substitute parts specify 4V at the same current. The higher threshold voltage in substitute parts requires greater gate drive voltage to achieve full on-state conduction. Both parts maintain ±20V maximum gate voltage rating, ensuring compatibility with standard gate drive circuits. Gate drive circuits must be verified to provide sufficient voltage margin above the 4V threshold.

Q: Are the substitute parts suitable for high-frequency switching applications?

A: Gate charge specifications indicate switching speed capability. The IRLIB9343 specifies 47 nC gate charge, while IRFI9540GPBF specifies 61 nC and IRFI9530GPBF specifies 38 nC. Lower gate charge enables faster switching transitions and reduced switching losses. The IRFI9530GPBF offers the fastest switching performance among the three parts. Application frequency requirements must be evaluated against these specifications.

Q: What compliance advantages do the substitute parts offer?

A: Both IRFI9540GPBF and IRFI9530GPBF are ROHS3 compliant, addressing regulatory requirements for lead-free and restricted substance compliance. The IRLIB9343 is RoHS non-compliant. For applications subject to RoHS directives or customer requirements, the substitute parts provide necessary compliance. Both parts are REACH unaffected, matching the original part's REACH status.

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