FR805 Equivalent & Substitute Parts Reference

Part Overview

The FR805 is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 600 V DC reverse voltage and 8 A average rectified current in a Through Hole TO-220AC package. This part is classified as Obsolete, making identification of equivalent and substitute components necessary for ongoing design support and procurement continuity. The FR805 operates across a junction temperature range of -65°C to 175°C and meets ROHS3 compliance requirements.

Substiute Parts

FR805

Diodes IncorporatedIn Stock: 2399FR805 Datasheet

Current PartRFQ

STTH12R06DIRG

STMicroelectronicsIn Stock: 1382STTH12R06DIRG Datasheet

MFR RecommendedRFQ

STTH506DTI

STMicroelectronicsIn Stock: 10289STTH506DTI Datasheet

MFR RecommendedRFQ

STTH8L06D

STMicroelectronicsIn Stock: 1431STTH8L06D Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FR805 are selected based on electrical and mechanical compatibility within the following criteria:

Primary Substitution Criteria:

• Voltage - DC Reverse (Vr) (Max): 600 V minimum
• Current - Average Rectified (Io): Equal to or greater than 8 A
• Mounting Type: Through Hole
• Package / Case: TO-220-2 or TO-220-2 Insulated
• Technology: Standard rectifier diode
• RoHS Status: ROHS3 Compliant

Substitute Parts Identified:

1. STTH8L06D (STMicroelectronics) – Direct electrical equivalent with identical voltage and current ratings
2. STTH12R06DIRG (STMicroelectronics) – Higher current rating (12 A) with same voltage specification
3. STTH506DTI (STMicroelectronics) – Lower current rating (5 A) with same voltage specification

All substitute parts maintain the 600 V reverse voltage rating and Through Hole TO-220AC mounting configuration required for FR805 replacement.

Parameter Comparison

Engineering Selection Recommendations

STTH8L06D is the primary direct substitute for FR805 applications. This part maintains identical voltage and current ratings (600 V, 8 A) with matching forward voltage characteristics (1.3 V @ 8 A). The STTH8L06D is manufactured by STMicroelectronics with Active product status, ensuring long-term availability and supply chain continuity. The part is ROHS3 compliant and operates across the same maximum junction temperature (175°C). Reverse recovery time is improved at 105 ns compared to the FR805 specification of 250 ns.

STTH12R06DIRG is suitable for applications where higher current capacity is acceptable. The 12 A rating provides design margin above the FR805 8 A specification while maintaining the 600 V voltage rating. This part features an insulated TO-220-2 package variant and significantly faster reverse recovery time (45 ns). Forward voltage increases to 2.9 V @ 12 A due to the higher current rating.

STTH506DTI is applicable only in applications where the circuit current requirement does not exceed 5 A. This part is not suitable as a direct replacement for FR805 in circuits designed for 8 A operation. The lower current rating makes this option unsuitable for full-load FR805 replacement scenarios.

All substitute parts maintain ROHS3 compliance and operate within the same thermal specifications as the original FR805 component.

Frequently Asked Questions (FAQ)

Q: Can STTH8L06D directly replace FR805 in all applications?

A: Yes. STTH8L06D provides identical electrical specifications for voltage (600 V) and current (8 A) ratings with matching forward voltage (1.3 V @ 8 A). Both parts use Through Hole TO-220-2 packaging. The STTH8L06D is manufactured by STMicroelectronics with Active product status, providing superior supply availability compared to the Obsolete FR805.

Q: What is the difference between STTH8L06D and STTH12R06DIRG?

A: The primary difference is current rating: STTH8L06D is rated for 8 A while STTH12R06DIRG is rated for 12 A. Both maintain 600 V reverse voltage. STTH12R06DIRG features an insulated TO-220-2 package variant and exhibits faster reverse recovery time (45 ns versus 105 ns). Forward voltage differs due to the higher current specification: 2.9 V @ 12 A for STTH12R06DIRG versus 1.3 V @ 8 A for STTH8L06D.

Q: Is STTH506DTI a suitable replacement for FR805?

A: STTH506DTI is not suitable as a direct replacement for FR805. The 5 A current rating is below the FR805 specification of 8 A. This part is only applicable in circuits where the maximum current requirement does not exceed 5 A.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. FR805, STTH8L06D, STTH12R06DIRG, and STTH506DTI are all ROHS3 compliant. All parts meet environmental and regulatory requirements for modern electronics manufacturing.

Q: What is the difference between TO-220-2 and TO-220-2 Insulated packaging?

A: Both package types are Through Hole TO-220AC configurations with identical electrical performance. The insulated variant (used in STTH12R06DIRG and STTH506DTI) includes electrical isolation between the mounting tab and the semiconductor junction, reducing the need for external isolation hardware in certain applications.

Q: How do reverse recovery times compare across substitute options?

A: FR805 specifies 250 ns reverse recovery time. STTH8L06D improves this to 105 ns. STTH12R06DIRG further reduces it to 45 ns, and STTH506DTI achieves 25 ns. Faster recovery times reduce switching losses and electromagnetic interference in high-frequency applications.

Q: Are there inventory considerations for substitute selection?

A: STTH506DTI has the highest inventory availability (10,200 pcs). STTH12R06DIRG has 1,300 pcs in stock, and STTH8L06D has 1,420 pcs available. All substitute parts are in active production with established supply chains.