ICMASS.COM - Global Electronic Component Solutions Provider

Q: Which of these three MOSFETs supports logic-level gate drive?

None. All require 10Vgs for full saturation. Use IRLZ44NPBF for logic-level drive or a gate driver IC.

Q: Are IRF540NPBF, IRF640NPBF, and IRFZ44NPBF pin-compatible?

Yes. All three use standard TO-220AB pinout (Gate, Drain, Source) with the tab as drain connection.

Q: Which part has the lowest Rds(on)?

IRFZ44NPBF at 17.5mΩ max. IRF540N: 44mΩ. IRF640N: 150mΩ.

Q: Which part has the highest avalanche energy rating?

IRFZ44NPBF at 260mJ - 1.3x IRF540N (200mJ) and 2x IRF640N (130mJ).

Q: Are these parts suitable for 48V battery systems?

IRF540N (100V) minimum for 48V Li-ion. IRF640N (200V) excellent. IRFZ44N (55V) not suitable.

All Categories

Language

Home > Blog > The Posts

IRF540NPBF vs IRF640NPBF vs IRFZ44NPBF — Which TO-220 Power MOSFET Should You Choose?

2026/6/22 13:34:02

Quick Summary

Pick IRFZ44NPBF for 12V/24V high-current designs (17.5mΩ max R_DS(on), 49A, $0.42/1k). Pick IRF540NPBF for 24V/48V systems (44mΩ, 33A, $0.55/1k). Pick IRF640NPBF for 48V-72V high-voltage applications (150mΩ, 18A, $0.65/1k). These three parts span the voltage-resistance trade-off in Infineon's TO-220 HEXFET family.

How Do IRF540NPBF, IRF640NPBF, and IRFZ44NPBF Compare on Key Parameters?

Parameter	IRFZ44NPBF	IRF540NPBF	IRF640NPBF
V_DS (max)	55V	100V	200V
I_D cont. (25°C case)	49A	33A	18A
I_D cont. (100°C case)	35A	23A	13A
I_D pulsed	160A	110A	72A
R_DS(on) max @ 10Vgs	17.5mΩ	44mΩ	150mΩ
R_DS(on) typ @ 10Vgs	13.5mΩ	35mΩ	115mΩ
Q_g total @ 10V	63nC	71nC	67nC
C_iss	1470pF	1960pF	1160pF
C_rss	88pF	40pF	53pF
E_AS (Avalanche)	260mJ	200mJ	130mJ
P_D (25°C case)	94W	130W	150W
θ_JC	1.5°C/W	1.15°C/W	1.0°C/W
t_rr	95ns	~100ns	170ns
Package	TO-220AB	TO-220AB	TO-220AB
Price (1k)	$0.42	$0.55	$0.65

What Is the Voltage vs Resistance Trade-Off in These MOSFETs?

Higher voltage rating requires a thicker, more lightly doped drift region, which increases on-resistance. The IRFZ44NPBF (55V) has 17.5mΩ max. Doubling the voltage to 100V (IRF540N) raises R_DS(on) to 44mΩ (2.5×). Going to 200V (IRF640N) raises it to 150mΩ (8.6×).

Choose the lowest voltage rating that provides adequate safety margin above your system's peak operating voltage plus transients. Higher voltage always means more heat at the same current.

What Is the Thermal Performance of Each MOSFET at Various Currents?

All calculations use typical R_DS(on) and a standard clip-on heatsink (θ_SA 25°C/W) at 25°C ambient.

At 10A Load

Part	Power	Junction Temp	Verdict
IRFZ44NPBF	1.35W	61°C	✅ Cool
IRF540NPBF	3.5W	118°C	⚠️ Warm
IRF640NPBF	11.5W	330°C	❌ Requires bolt-on heatsink

At 20A Load

Part	Power	Junction Temp	Verdict
IRFZ44NPBF	5.4W	171°C	⚠️ Near limit
IRF540NPBF	14W	-	❌ Exceeds max
IRF640NPBF	46W	-	❌ Impossible

Are These Three MOSFETs Pin-Compatible?

Yes. All three use the standard TO-220AB pinout: pin 1 = Gate, pin 2 = Drain, pin 3 = Source. The metal tab is also the drain. They are drop-in replacements on the same PCB footprint, provided voltage and current ratings match your application.

When Should You Choose IRFZ44NPBF?

The efficiency king for 12V/24V systems. 55V rating, 17.5mΩ max R_DS(on), 49A continuous. At 10A with clip-on heatsink: only 61°C junction temp. Best for motor controllers, battery disconnect switches, DC-DC converters, and battery chargers.

Limitation: 55V Vds is insufficient for 48V systems (54.6V full charge leaves zero transient margin).

When Should You Choose IRF540NPBF?

The general-purpose workhorse. 100V rating, 44mΩ max R_DS(on), 33A continuous. At 10A with clip-on heatsink: 118°C junction temp - warm but acceptable. Best for 48V telecom, 24V industrial control, e-bike controllers, and solar charge controllers.

Limitation: R_DS(on) is 2.5× higher than IRFZ44N. 71nC Q_g is the highest of the three.

When Should You Choose IRF640NPBF?

For high-voltage systems where 100V is insufficient. 200V rating, 150mΩ max R_DS(on), 18A continuous. Best for 48-72V e-mobility, 110VAC offline power supplies, telecom rectifiers, and solar micro-inverters.

Limitation: 150mΩ means 11.5W at 10A - requires a large bolt-on heatsink or forced air. At 10A, junction temp reaches 330°C with a clip-on heatsink.

Frequently Asked Questions About IRF540NPBF vs IRF640NPBF vs IRFZ44NPBF

Q1: Which of these three MOSFETs supports logic-level gate drive?
A: None. All three have V_GS(th) of 2.0-4.0V and require 10Vgs for full saturation. Use IRLZ44NPBF for logic-level drive or a gate driver IC.

Q2: Can these MOSFETs be driven directly from an MCU GPIO?
A: Not for high efficiency. At 5Vgs, R_DS(on) is approximately 2-3× higher. Use a TC4427 gate driver for best performance.

Q3: Are IRF540NPBF, IRF640NPBF, and IRFZ44NPBF pin-compatible?
A: Yes. All three use standard TO-220AB pinout (G-D-S from left) with tab as drain. Drop-in replacements.

Q4: Which part has the lowest R_DS(on)?
A: IRFZ44NPBF at 17.5mΩ max (13.5mΩ typ). IRF540N: 44mΩ. IRF640N: 150mΩ.

Q5: Which part has the highest avalanche energy rating?
A: IRFZ44NPBF at 260mJ - 1.3× IRF540N (200mJ) and 2× IRF640N (130mJ).

Q6: What is the maximum practical switching frequency for each part?
A: IRFZ44N: 100kHz. IRF540N: 50kHz (limited by 71nC Q_g and 1960pF C_iss). IRF640N: 200kHz.

Q7: Can the IRF540N or IRF640N replace the IRFZ44N in a 12V motor driver?
A: Electrically yes, but thermally much worse. At 10A: IRFZ44N 1.75W, IRF540N 4.4W, IRF640N 15W.

Q8: What is the thermal resistance junction-to-case (θ_JC) for each?
A: IRFZ44N: 1.5°C/W. IRF540N: 1.15°C/W. IRF640N: 1.0°C/W.

Q9: Are these parts suitable for 48V battery systems?
A: IRF540N (100V) minimum recommended for 48V Li-ion (54.6V full charge). IRF640N (200V) excellent. IRFZ44N (55V) - not suitable.

Q10: Which has the highest continuous current rating at 100°C case temperature?
A: IRFZ44N at 35A, IRF540N at 23A, IRF640N at 13A.