IRF840LCL MOSFET N-Channel 500V 8A Equivalent & Substitute Parts

Part Overview

The IRF840LCL is an N-Channel MOSFET manufactured by Vishay Siliconix, rated for 500V drain-to-source voltage with 8A continuous drain current. This device is packaged in a through-hole I2PAK (TO-262-3) configuration and is designed for high-voltage switching applications. The IRF840LCL is classified as obsolete, making identification of equivalent substitute parts essential for ongoing design support, maintenance, and production continuity. Substitute parts must maintain identical electrical performance and mechanical compatibility to ensure direct replacement without circuit redesign.

Key Parameters

Parameter	Value	Specification
FET Type	N-Channel	Polarity and conduction type
Drain to Source Voltage (Vdss)	500 V	Maximum voltage rating
Continuous Drain Current (Id) @ 25°C	8A (Tc)	Maximum current capacity
On-State Resistance (Rds On Max)	850 mOhm @ 4.8A, 10V	Conduction loss parameter
Gate Threshold Voltage (Vgs(th) Max)	4V @ 250µA	Gate drive requirement
Gate Charge (Qg) Max	39 nC @ 10V	Switching speed parameter
Input Capacitance (Ciss) Max	1100 pF @ 25V	Input impedance parameter
Power Dissipation Max	3.1W (Ta), 125W (Tc)	Thermal rating
Operating Temperature Range	-55°C to 150°C (TJ)	Junction temperature limits
Mounting Type	Through Hole	PCB assembly method
Package / Case	TO-262-3 Long Leads, I2PAK, TO-262AA	Physical form factor

Substitute Part Grouping Explanation

Substitute parts for the IRF840LCL are identified based on strict parametric equivalence across all critical electrical and mechanical specifications. The substitution logic is based on the following key parameters:

Electrical Equivalence Criteria:

Drain-to-Source Voltage (Vdss): Must equal 500V
Continuous Drain Current (Id): Must equal 8A at 25°C
On-State Resistance (Rds On): Must equal 850 mOhm at specified conditions
Gate Threshold Voltage (Vgs(th)): Must equal 4V at 250µA
Gate Charge (Qg): Must equal 39 nC at 10V
Input Capacitance (Ciss): Must equal 1100 pF at 25V
Power Dissipation: Must equal 3.1W (Ta) and 125W (Tc)
Operating Temperature Range: Must span -55°C to 150°C

Mechanical Equivalence Criteria:

Mounting Type: Through Hole
Package / Case: TO-262-3 Long Leads, I2PAK, TO-262AA
FET Type: N-Channel
Technology: MOSFET (Metal Oxide)

Parts meeting all these criteria are classified as parametric equivalents and direct substitutes.

Parameter Comparison

Parameter	IRF840LCL	IRF840LCLPBF	Match Status
Manufacturer	Vishay Siliconix	Vishay Siliconix	Identical
FET Type	N-Channel	N-Channel	Identical
Technology	MOSFET (Metal Oxide)	MOSFET (Metal Oxide)	Identical
Drain to Source Voltage (Vdss)	500 V	500 V	Identical
Continuous Drain Current (Id) @ 25°C	8A (Tc)	8A (Tc)	Identical
Drive Voltage (Max Rds On)	10V	10V	Identical
Rds On (Max) @ Id, Vgs	850 mOhm @ 4.8A, 10V	850 mOhm @ 4.8A, 10V	Identical
Vgs(th) (Max) @ Id	4V @ 250µA	4V @ 250µA	Identical
Gate Charge (Qg) (Max) @ Vgs	39 nC @ 10V	39 nC @ 10V	Identical
Vgs (Max)	±30V	±30V	Identical
Input Capacitance (Ciss) (Max) @ Vds	1100 pF @ 25V	1100 pF @ 25V	Identical
Power Dissipation (Max)	3.1W (Ta), 125W (Tc)	3.1W (Ta), 125W (Tc)	Identical
Operating Temperature	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)	Identical
Mounting Type	Through Hole	Through Hole	Identical
Package / Case	TO-262-3 Long Leads, I2PAK, TO-262AA	TO-262-3 Long Leads, I2PAK, TO-262AA	Identical
Base Product Number	IRF840	IRF840	Identical
Product Status	Obsolete	Active	Different
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Different
Packaging	Not specified	Tube	Different

Engineering Selection Recommendations

The IRF840LCLPBF is a direct parametric equivalent to the IRF840LCL. All electrical specifications, mechanical dimensions, and thermal characteristics are identical. The primary differences are non-functional:

Product Status: The IRF840LCLPBF is classified as Active, whereas the IRF840LCL is Obsolete. Selection of the active part ensures long-term availability and supply chain continuity.

Compliance Status: The IRF840LCLPBF is ROHS3 Compliant, meeting current environmental and regulatory requirements. The IRF840LCL is RoHS non-compliant. For applications subject to RoHS regulations or customer requirements, the IRF840LCLPBF is the appropriate selection.

Packaging: The IRF840LCLPBF is supplied in Tube packaging, which is standard for production environments. The original IRF840LCL packaging is not specified. Tube packaging is suitable for automated assembly processes.

Moisture Sensitivity: Both parts carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions.

REACH and ECCN Status: Both parts maintain identical REACH Unaffected and EAR99 classifications.

For new designs, maintenance, and production applications, the IRF840LCLPBF is the recommended selection due to active product status and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can the IRF840LCLPBF be used as a direct replacement for the IRF840LCL in existing circuits?

A: Yes. The IRF840LCLPBF is a parametric equivalent with identical electrical and mechanical specifications. No circuit modifications are required. Pin configuration, voltage ratings, current capacity, and thermal characteristics are identical.

Q: What is the difference between IRF840LCL and IRF840LCLPBF?

A: The electrical and mechanical specifications are identical. The primary differences are: (1) Product Status—IRF840LCLPBF is Active while IRF840LCL is Obsolete; (2) RoHS Compliance—IRF840LCLPBF is ROHS3 Compliant while IRF840LCL is non-compliant; (3) Packaging—IRF840LCLPBF is supplied in Tube format.

Q: Is the IRF840LCLPBF suitable for applications requiring RoHS compliance?

A: Yes. The IRF840LCLPBF is ROHS3 Compliant and meets current environmental regulations. The IRF840LCL is RoHS non-compliant and should not be used in applications with RoHS requirements.

Q: Are there any thermal or performance differences between these parts?

A: No. Both parts have identical power dissipation ratings (3.1W at Ta, 125W at Tc), operating temperature ranges (-55°C to 150°C), and all electrical parameters including Rds On, gate charge, and input capacitance.

Q: What is the TO-262-3 package, and is it compatible with standard PCB layouts?

A: The TO-262-3 (I2PAK) is a through-hole package with three leads. Both the IRF840LCL and IRF840LCLPBF use this identical package configuration, ensuring mechanical and electrical compatibility with existing PCB designs without layout modifications.

Q: Can I mix IRF840LCL and IRF840LCLPBF parts in the same production batch?

A: Yes. Since all electrical and mechanical specifications are identical, both parts are functionally interchangeable. However, for consistency and supply chain management, using a single part number (IRF840LCLPBF) is recommended for new production.

Q: What does MSL 1 (Unlimited) mean for moisture sensitivity?

A: MSL 1 indicates the lowest moisture sensitivity level. These parts have unlimited shelf life and require no special moisture control during storage or handling. Standard ESD precautions apply.

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