BA979-GS18 Equivalent & Substitute Parts

Part Overview

The BA979-GS18 is an RF Diode PIN - Single 30V 50 mA SOD-80 QuadroMELF component manufactured by Vishay General Semiconductor - Diodes Division. This part is classified as obsolete, with 788 pieces currently in stock. The BA979-GS18 is a PIN diode designed for RF applications requiring low capacitance and controlled resistance characteristics at 100 MHz. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary for new designs and long-term supply chain continuity.

Substiute Parts

BA979-GS18

Vishay General Semiconductor - Diodes DivisionIn Stock: 826BA979-GS18 Datasheet

Current PartRFQ

BA679-GS18

Vishay General Semiconductor - Diodes DivisionIn Stock: 10237BA679-GS18 Datasheet

DirectRFQ

MA4P1250-1072T

MACOM Technology SolutionsIn Stock: 305226MA4P1250-1072T Datasheet

MFR RecommendedRFQ

MA4P7001F-1072T

MACOM Technology SolutionsIn Stock: 21259MA4P7001F-1072T Datasheet

MFR RecommendedRFQ

MA4P7002F-1072T

MACOM Technology SolutionsIn Stock: 6022MA4P7002F-1072T Datasheet

MFR RecommendedRFQ

MA4P7006F-1072T

MACOM Technology SolutionsIn Stock: 1569MA4P7006F-1072T Datasheet

MFR RecommendedRFQ

MA4P7101F-1072T

MACOM Technology SolutionsIn Stock: 19228MA4P7101F-1072T Datasheet

MFR RecommendedRFQ

MA4P7102F-1072T

MACOM Technology SolutionsIn Stock: 17326MA4P7102F-1072T Datasheet

MFR RecommendedRFQ

MA4P7104F-1072T

MACOM Technology SolutionsIn Stock: 4825MA4P7104F-1072T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BA979-GS18 is determined by the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Diode Type: PIN - Single
• Voltage - Peak Reverse (Max): Must meet or exceed 30V
• Current - Max: Must meet or exceed 50 mA
• Capacitance @ Vr, F: Must be compatible with RF circuit requirements
• Resistance @ If, F: Must be compatible with RF circuit requirements
• Operating Temperature: Must support 125°C (TJ) minimum
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: MSL 1 (Unlimited)

Direct Equivalent (Same Voltage Class): The BA679-GS18 is a direct equivalent from Vishay, maintaining identical electrical specifications (30V, 50 mA, 0.5pF @ 0V, 50Ohm @ 1.5mA) with the primary difference being package variant (SOD-80 MiniMELF vs. QuadroMELF). This part is active and available in higher inventory quantities.

Higher Voltage Alternatives (Uprated Substitutes): MACOM Technology Solutions MA4P series diodes provide higher voltage ratings (100V to 600V) with increased power dissipation capabilities. These parts maintain PIN diode functionality and RF characteristics while offering enhanced performance margins for applications requiring higher voltage tolerance or greater power handling.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance): The BA679-GS18 is the recommended direct substitute for the BA979-GS18. Both parts maintain identical electrical specifications (30V peak reverse voltage, 50 mA maximum current, 0.5pF capacitance, and 50Ohm resistance at 100 MHz). The BA679-GS18 is active with 10,200 pieces in stock, providing superior supply chain continuity compared to the obsolete BA979-GS18. The primary difference is the package variant (MiniMELF vs. QuadroMELF), which requires PCB layout verification for mechanical compatibility.

For Higher Voltage Applications: MACOM MA4P series diodes (MA4P7001F-1072T through MA4P7104F-1072T) are suitable for applications requiring voltage ratings exceeding 30V. These parts are active products with extended operating temperature ranges (-55°C to 175°C) and higher power dissipation capabilities (6W to 11.5W). Selection among MA4P variants depends on specific voltage requirements: MA4P1250-1072T (100V), MA4P7001F-1072T (100V), MA4P7002F-1072T (200V), MA4P7006F-1072T (600V), MA4P7101F-1072T (200V), MA4P7102F-1072T (200V), and MA4P7104F-1072T (400V).

All substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, meeting the compliance requirements of the original BA979-GS18.

Frequently Asked Questions (FAQ)

Q: Can BA679-GS18 be used as a direct replacement for BA979-GS18? A: Yes. Both parts are PIN diodes with identical electrical specifications: 30V peak reverse voltage, 50 mA maximum current, 0.5pF capacitance at 0V/100MHz, and 50Ohm resistance at 1.5mA/100MHz. The BA679-GS18 is active and available in higher quantities. PCB layout must accommodate the MiniMELF package variant (SOD-80 MiniMELF) instead of QuadroMELF.

Q: What is the difference between BA979-GS18 and BA679-GS18? A: The electrical specifications are identical. The primary difference is the package variant: BA979-GS18 uses SOD-80 QuadroMELF, while BA679-GS18 uses SOD-80 MiniMELF. Both are manufactured by Vishay General Semiconductor - Diodes Division. BA679-GS18 is active with higher inventory availability.

Q: When should I use MACOM MA4P series diodes instead of BA679-GS18? A: Use MACOM MA4P series diodes when your application requires higher voltage ratings (100V to 600V), greater power dissipation (6W to 11.5W), or extended operating temperature range (-55°C to 175°C). The BA679-GS18 is suitable for applications limited to 30V and 125°C maximum junction temperature.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All parts listed—BA979-GS18, BA679-GS18, and all MACOM MA4P variants—are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Q: What package types are available among the substitute parts? A: BA679-GS18 uses SOD-80 MiniMELF. MACOM MA4P series parts use various packages: MA4P1250-1072T and MA4P7101F-1072T use MELF and ODS-1072 respectively, while MA4P7001F-1072T, MA4P7002F-1072T, MA4P7006F-1072T, MA4P7102F-1072T, and MA4P7104F-1072T use 2-SMD packages. PCB layout compatibility must be verified for each package type.

Q: Is the BA979-GS18 still available for purchase? A: The BA979-GS18 is classified as obsolete. While 788 pieces are currently in stock, long-term availability is not guaranteed. The BA679-GS18 (active status, 10,200 pieces in stock) is recommended for new designs and future production.