GI818 Equivalent & Substitute Parts

Part Overview

The GI818 is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 1000 V DC reverse voltage and 1 A average rectified current in a DO-204AC (DO-15) through-hole axial package. This component is classified as Active product status and operates across a junction temperature range of -65°C to 175°C. The GI818 belongs to the SUPERECTIFIER® series and utilizes standard recovery technology with a reverse recovery time of 750 ns.

Substitute parts are necessary when the original GI818 becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when design specifications permit operation with modified electrical characteristics within acceptable application parameters.

Substiute Parts

GI818

Vishay General Semiconductor - Diodes DivisionIn Stock: 1145GI818 Datasheet

Current PartRFQ

D7G-T

Diodes IncorporatedIn Stock: 662D7G-T Datasheet

MFR RecommendedRFQ

EGP10K

Fairchild SemiconductorIn Stock: 28398EGP10K Datasheet

MFR RecommendedRFQ

HER208G-TP

Micro Commercial CoIn Stock: 29827HER208G-TP Datasheet

MFR RecommendedRFQ

PR1006G-T

Diodes IncorporatedIn Stock: 3170PR1006G-T Datasheet

MFR RecommendedRFQ

UF4007GP-AP

Micro Commercial CoIn Stock: 3078UF4007GP-AP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the GI818 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Voltage - DC Reverse (Vr) rating must equal or exceed 1000 V
• Current - Average Rectified (Io) rating must equal or exceed 1 A
• Mounting type must be through-hole axial configuration
• Package format must be compatible with PCB hole spacing and lead diameter specifications

Secondary Compatibility Factors:

• Forward voltage (Vf) characteristics affect power dissipation but do not prevent substitution
• Reverse recovery time (trr) affects switching performance but does not prevent substitution
• Reverse leakage current affects standby power consumption but does not prevent substitution
• Operating temperature range must accommodate the application's thermal environment

The substitute parts listed below meet the primary substitution criteria with varying package formats (DO-15, DO-41, T-1) and recovery speed classifications (standard or fast recovery).

Parameter Comparison

Engineering Selection Recommendations

Full Voltage and Current Rating Match (1000 V, 1 A):

The D7G-T, UF4007GP-AP, and HER208G-TP maintain the complete electrical specification of the GI818 with 1000 V reverse voltage and 1 A average rectified current. These parts are direct functional equivalents.

• D7G-T (Diodes Incorporated): Maintains standard recovery technology matching the GI818 recovery speed classification. Package format is T-1 (axial through-hole). ROHS3 compliant. Operating temperature range is -65°C to 150°C, which is 25°C lower than the GI818 maximum junction temperature.

• UF4007GP-AP (Micro Commercial Co): Offers fast recovery technology (75 ns) with improved switching performance compared to the GI818. Package format is DO-41 (axial through-hole). ROHS3 compliant. Operating temperature range is -55°C to 150°C.

• HER208G-TP (Micro Commercial Co): Rated for 2 A average rectified current, exceeding the GI818 specification. Fast recovery technology (75 ns). Package format is DO-15 (axial through-hole), matching the GI818 package family. ROHS3 compliant. Operating temperature range is -55°C to 150°C.

Reduced Voltage Rating (800 V):

The PR1006G-T and EGP10K are rated for 800 V reverse voltage, which is 200 V below the GI818 specification. These parts are suitable only for applications where the maximum reverse voltage does not exceed 800 V.

• PR1006G-T (Diodes Incorporated): Fast recovery technology (500 ns). Package format is DO-41 (axial through-hole). ROHS3 compliant. Operating temperature range is -65°C to 150°C.

• EGP10K (Fairchild Semiconductor): Fast recovery technology (75 ns). Package format is DO-41 (axial through-hole). Operating temperature range is -65°C to 150°C. Bulk packaging format.

Compliance Considerations:

The GI818 is RoHS non-compliant. All substitute parts except EGP10K are ROHS3 compliant, which may be required for new designs or applications subject to RoHS regulations. All parts share the same ECCN (EAR99) and HTSUS (8541.10.0080) classifications.

Frequently Asked Questions (FAQ)

Q: Can the D7G-T replace the GI818 in all applications?

A: The D7G-T maintains the same voltage (1000 V) and current (1 A) ratings as the GI818 and uses standard recovery technology. The primary difference is the package format (T-1 versus DO-15) and a 25°C lower maximum junction temperature (-65°C to 150°C versus -65°C to 175°C). Substitution is valid for applications where the PCB layout accommodates T-1 package lead spacing and where the operating temperature does not exceed 150°C.

Q: What is the difference between standard and fast recovery diodes?

A: Recovery speed is measured by reverse recovery time (trr). The GI818 has a standard recovery time of 750 ns. Fast recovery diodes such as UF4007GP-AP, PR1006G-T, HER208G-TP, and EGP10K have trr values of 75 ns to 500 ns. Fast recovery diodes switch more quickly, reducing switching losses and electromagnetic interference. They are suitable as substitutes when improved switching performance is acceptable or beneficial.

Q: Can I use HER208G-TP (2 A rated) instead of GI818 (1 A rated)?

A: Yes. The HER208G-TP is rated for 2 A average rectified current, which exceeds the GI818 requirement of 1 A. Higher current rating provides design margin and does not create compatibility issues. The HER208G-TP maintains the same 1000 V reverse voltage rating and uses the DO-15 package format, which is compatible with GI818 PCB layouts. Fast recovery technology (75 ns) provides improved switching performance.

Q: Why are PR1006G-T and EGP10K listed as substitutes if they are only rated for 800 V?

A: These parts are listed as substitutes because they meet the 1 A current requirement and use through-hole axial packages. However, they are only suitable for applications where the maximum reverse voltage does not exceed 800 V. If the application requires 1000 V reverse voltage capability, these parts are not appropriate substitutes.

Q: What is the impact of different forward voltage (Vf) ratings?

A: Forward voltage affects power dissipation during conduction. The GI818 has Vf of 1.2 V @ 1 A. Substitute parts range from 1 V to 1.7 V @ 1 A. Higher forward voltage results in greater power dissipation and heat generation. For applications with tight thermal budgets or high-frequency operation, lower forward voltage is preferable. This parameter does not prevent substitution but affects thermal design.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed are ROHS3 compliant except EGP10K, which does not specify RoHS status. The GI818 is RoHS non-compliant. If RoHS compliance is required for the application, D7G-T, UF4007GP-AP, PR1006G-T, and HER208G-TP are suitable choices.

Q: What package format considerations apply to substitution?

A: The GI818 uses DO-204AC (DO-15) package with axial leads. Substitute parts use three different package formats: T-1 (D7G-T), DO-41 (UF4007GP-AP, PR1006G-T, EGP10K), and DO-15 (HER208G-TP). All are through-hole axial packages. PCB hole spacing and lead diameter specifications must be verified before substitution. The HER208G-TP is the most direct package match to the GI818.

Q: Can I substitute GI818 with a part rated for lower temperature range?

A: The GI818 operates from -65°C to 175°C. Substitute parts operate from -55°C to 150°C or -65°C to 150°C. Substitution is valid only if the application's maximum operating temperature does not exceed the substitute part's maximum junction temperature rating. If the application requires operation above 150°C, only parts with higher temperature ratings are suitable.