BA979S-GS08 Equivalent & Substitute Parts

Part Overview

The BA979S-GS08 is an RF Diode PIN - Single 30V 50 mA SOD-80 QuadroMELF manufactured by Vishay General Semiconductor - Diodes Division. This component is classified as obsolete, with 1,179 pieces currently in stock. The part operates at a maximum junction temperature of 125°C and is ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Due to the obsolete product status, equivalent and substitute parts are necessary for ongoing design support, production continuity, and long-term component availability. Substitute options include direct Vishay alternatives and manufacturer-recommended MACOM Technology Solutions RF PIN diodes that meet or exceed the electrical specifications of the original part.

Key Parameters

Parameter	BA979S-GS08 Value
Diode Type	PIN - Single
Voltage - Peak Reverse (Max)	30V
Current - Max	50 mA
Capacitance @ Vr, F	0.5pF @ 0V, 100MHz
Resistance @ If, F	50Ohm @ 1.5mA, 100MHz
Operating Temperature (TJ)	125°C
Package / Case	SOD-80 Variant
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution logic for the BA979S-GS08 is based on the following critical parameters:

Primary Substitution Criteria:

Diode Type: PIN - Single (all substitutes maintain this classification)
Voltage - Peak Reverse (Max): Minimum 30V required; higher voltage ratings are acceptable for applications with voltage margin requirements
Current - Max: Minimum 50 mA required; higher current ratings provide design flexibility
Resistance @ If, F: Lower resistance values indicate improved RF performance; values at or below 50Ohm @ 1.5mA are preferred
Operating Temperature: Minimum 125°C (TJ) required; extended temperature ranges (-55°C to 175°C) provide enhanced reliability
RoHS Status: ROHS3 Compliant (all substitutes meet this requirement)
MSL Rating: 1 (Unlimited) preferred for moisture sensitivity

Substitute Categories:

Category 1: Direct Vishay Equivalent

BA679S-GS08: Identical electrical specifications with packaging variant (SOD-80 MiniMELF vs. QuadroMELF)

Category 2: MACOM Manufacturer-Recommended Substitutes

MA4P1250-1072T: Higher voltage (100V) and power dissipation (6W) for enhanced margin applications
MA4P7001F-1072T: 100V rating with 10W power dissipation and 900mOhm resistance
MA4P7002F-1072T: 200V rating with 10W power dissipation for higher voltage applications
MA4P7006F-1072T: 600V rating with 10W power dissipation for extreme voltage margin requirements
MA4P7101F-1072T: 200V rating with 11.5W power dissipation and 500mOhm resistance
MA4P7102F-1072T: 200V rating with 11.5W power dissipation and 500mOhm resistance
MA4P7104F-1072T: 400V rating with 11.5W power dissipation for high-voltage applications

All MACOM substitutes exceed the minimum current requirement (50 mA) and provide extended operating temperature ranges (-55°C to 175°C).

Parameter Comparison

Part Number	Manufacturer	Voltage - Peak Reverse (Max)	Current - Max	Resistance @ If, F	Operating Temperature (TJ)	Product Status	Package / Case
BA979S-GS08	Vishay	30V	50 mA	50Ohm @ 1.5mA, 100MHz	125°C	Obsolete	SOD-80 QuadroMELF
BA679S-GS08	Vishay	30V	50 mA	50Ohm @ 1.5mA, 100MHz	125°C	Active	SOD-80 MiniMELF
MA4P1250-1072T	MACOM	100V	Not specified	750mOhm @ 50mA, 100MHz	-55°C ~ 175°C	Active	MELF
MA4P7001F-1072T	MACOM	100V	Not specified	900mOhm @ 100mA, 100MHz	-55°C ~ 175°C	Active	2-SMD
MA4P7002F-1072T	MACOM	200V	Not specified	900mOhm @ 100mA, 100MHz	-55°C ~ 175°C	Active	2-SMD
MA4P7006F-1072T	MACOM	600V	Not specified	900mOhm @ 100mA, 100MHz	-55°C ~ 175°C	Active	2-SMD
MA4P7101F-1072T	MACOM	200V	Not specified	500mOhm @ 100mA, 100MHz	-55°C ~ 175°C	Active	2-SMD, No Lead
MA4P7102F-1072T	MACOM	200V	Not specified	500mOhm @ 100mA, 100MHz	-55°C ~ 175°C	Active	2-SMD
MA4P7104F-1072T	MACOM	400V	Not specified	500mOhm @ 100mA, 100MHz	-55°C ~ 175°C	Active	2-SMD

Engineering Selection Recommendations

For Direct Replacement (Minimum Design Changes): BA679S-GS08 is the preferred substitute. This Vishay part maintains identical electrical specifications (30V, 50 mA, 50Ohm resistance, 125°C operating temperature) and ROHS3 compliance. The only difference is the package variant (SOD-80 MiniMELF vs. QuadroMELF). This part is active with 2,446 pieces in stock, ensuring long-term availability.

For Enhanced Voltage Margin Applications: MACOM MA4P7101F-1072T or MA4P7102F-1072T are recommended. Both provide 200V peak reverse voltage with improved resistance characteristics (500mOhm @ 100mA, 100MHz) and extended operating temperature range (-55°C to 175°C). These parts are active with substantial inventory (19,180 and 17,300 pieces respectively) and maintain ROHS3 compliance.

For Extreme Voltage Margin or High-Power Applications: MA4P7006F-1072T offers 600V peak reverse voltage with 10W power dissipation, suitable for applications requiring maximum voltage headroom. This part is active with 1,533 pieces in stock.

All recommended substitutes maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity ratings, ensuring compatibility with existing manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can BA679S-GS08 be used as a direct drop-in replacement for BA979S-GS08? A: BA679S-GS08 is electrically equivalent with identical voltage (30V), current (50 mA), and resistance (50Ohm @ 1.5mA, 100MHz) specifications. The primary difference is the package variant: SOD-80 MiniMELF versus SOD-80 QuadroMELF. PCB layout and footprint compatibility must be verified before implementation.

Q: Why do MACOM substitutes have higher voltage ratings than the original BA979S-GS08? A: Higher voltage ratings provide design margin for applications subject to voltage transients or overshoot conditions. MACOM parts are manufacturer-recommended substitutes that exceed the minimum 30V requirement while maintaining RF performance characteristics suitable for PIN diode applications.

Q: Are MACOM substitutes compatible with the original SOD-80 QuadroMELF package? A: No. MACOM substitutes use 2-SMD or MELF packages, which differ from the SOD-80 QuadroMELF package of the BA979S-GS08. PCB redesign and re-qualification are required for MACOM substitutes.

Q: What is the difference between MA4P7101F-1072T and MA4P7102F-1072T? A: Both parts provide identical electrical specifications (200V, 500mOhm @ 100mA, 100MHz, 11.5W power dissipation, -55°C to 175°C operating range). MA4P7101F-1072T uses ODS-1072 package (No Lead), while MA4P7102F-1072T uses standard 2-SMD package. Selection depends on PCB assembly capabilities and design requirements.

Q: Are all substitute parts ROHS3 compliant? A: Yes. BA679S-GS08 and all MACOM substitutes (MA4P1250-1072T, MA4P7001F-1072T, MA4P7002F-1072T, MA4P7006F-1072T, MA4P7101F-1072T, MA4P7102F-1072T, MA4P7104F-1072T) are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity ratings.

Q: Which substitute offers the best RF performance at 100 MHz? A: MA4P7101F-1072T and MA4P7102F-1072T provide the lowest resistance at 100 MHz (500mOhm @ 100mA), indicating superior RF performance compared to other MACOM substitutes. These parts are recommended for RF-critical applications.

Q: What inventory levels are available for each substitute? A: BA679S-GS08: 2,446 pieces; MA4P1250-1072T: 305,200 pieces; MA4P7001F-1072T: 21,200 pieces; MA4P7002F-1072T: 5,930 pieces; MA4P7006F-1072T: 1,533 pieces; MA4P7101F-1072T: 19,180 pieces; MA4P7102F-1072T: 17,300 pieces; MA4P7104F-1072T: 4,800 pieces.

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