BA479S-TAP RF PIN Diode Equivalent & Substitute Parts

Part Overview

The BA479S-TAP is an RF PIN diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 30V peak reverse voltage with a maximum current of 50 mA. This single PIN diode is packaged in DO-204AH (DO-35) axial configuration and is actively produced with ROHS3 compliance. The BA479S-TAP serves in RF switching and attenuation applications where low capacitance and controlled resistance characteristics are required at 100 MHz operation.

Substitute parts become necessary when the original BA479S-TAP is unavailable, when higher voltage or power ratings are required for circuit redesign, or when alternative packaging formats better suit manufacturing processes.

Key Parameters

Parameter	BA479S-TAP
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	125°C (TJ)
Package / Case	DO-204AH, DO-35, Axial
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution of the BA479S-TAP is determined by the following electrical and mechanical criteria:

Primary Substitution Criteria:

Diode Type: PIN - Single (all substitutes maintain this classification)
Package / Case: Axial configuration (mechanical compatibility with through-hole mounting)
Voltage - Peak Reverse (Max): Equal to or greater than 30V (electrical safety margin)
Current - Max: Equal to or greater than 50 mA (functional capacity)
Operating Temperature Range: Must support the application's thermal requirements
RoHS Status: ROHS3 Compliant (regulatory compliance)

Substitute Parts Grouped by Voltage Rating:

Group 1 - 100V Rating (Higher voltage margin):

MA4P1200NM-401T (1.5W power dissipation)
MA4P4001B-402 (2.5W power dissipation)
MA4P4301B-402 (10W power dissipation)

Group 2 - 200V Rating (Extended voltage capability):

MA4P4002B-402 (2.5W power dissipation)
MA4P7102B-401T (6W power dissipation)

Group 3 - 400V+ Rating (High voltage applications):

MA4P7104B-401T (400V, 6W power dissipation)
MA4P4006B-402 (600V, 12W power dissipation)

All substitute parts are manufactured by MACOM Technology Solutions, maintain PIN diode single configuration, feature axial packaging, and are ROHS3 compliant with active product status.

Parameter Comparison

Part Number	Manufacturer	Voltage - Peak Reverse (Max)	Current - Max	Resistance @ If, F	Power Dissipation (Max)	Operating Temperature	Package / Case	RoHS Status	Product Status
BA479S-TAP	Vishay	30V	50 mA	50Ohm @ 1.5mA, 100MHz	—	125°C (TJ)	DO-204AH, DO-35, Axial	ROHS3	Active
MA4P1200NM-401T	MACOM	100V	—	750mOhm @ 50mA, 100MHz	1.5 W	-55°C ~ 175°C (TJ)	Axial	ROHS3	Active
MA4P4001B-402	MACOM	100V	—	500mOhm @ 100mA, 100MHz	2.5 W	-55°C ~ 175°C (TJ)	Axial	ROHS3	Active
MA4P4002B-402	MACOM	200V	—	500mOhm @ 100mA, 100MHz	2.5 W	-55°C ~ 175°C (TJ)	Axial	ROHS3	Active
MA4P4006B-402	MACOM	600V	—	500mOhm @ 100mA, 100MHz	12 W	-55°C ~ 175°C (TJ)	Axial	ROHS3	Active
MA4P4301B-402	MACOM	100V	—	1Ohm @ 100mA, 100MHz	10 W	-55°C ~ 175°C (TJ)	Axial	ROHS3	Active
MA4P7102B-401T	MACOM	200V	—	500mOhm @ 100mA, 100MHz	6 W	-55°C ~ 175°C (TJ)	Axial	ROHS3	Active
MA4P7104B-401T	MACOM	400V	—	750mOhm @ 50mA, 100MHz	6 W	-55°C ~ 175°C (TJ)	Axial	ROHS3	Active

Engineering Selection Recommendations

All listed substitute parts maintain active product status and ROHS3 compliance, ensuring regulatory alignment with the original BA479S-TAP specification. Selection among substitutes depends on circuit voltage requirements and thermal dissipation capacity.

For applications operating at or below 30V with minimal thermal load, MA4P1200NM-401T, MA4P4001B-402, or MA4P4301B-402 provide direct functional replacement with extended voltage margins. These parts support the original 50 mA current specification and maintain 100 MHz operation.

For circuits requiring higher voltage withstand capability, MA4P4002B-402 and MA4P7102B-401T offer 200V ratings, while MA4P7104B-401T and MA4P4006B-402 extend to 400V and 600V respectively. These higher-voltage options introduce increased power dissipation capacity, suitable for applications with elevated thermal requirements.

All substitute parts feature extended operating temperature ranges (-55°C to 175°C) compared to the BA479S-TAP (125°C maximum), providing thermal design flexibility for demanding environments.

Frequently Asked Questions (FAQ)

Q: Can MA4P1200NM-401T directly replace BA479S-TAP in a 30V circuit?

A: Yes. MA4P1200NM-401T exceeds the 30V voltage requirement with a 100V rating, maintains axial packaging for mechanical compatibility, and supports the 50 mA current specification. The higher voltage rating provides additional safety margin without affecting circuit function at lower operating voltages.

Q: What is the difference between Cut Tape (CT) and Bulk packaging for MACOM substitutes?

A: Packaging format affects supply chain and manufacturing integration. Cut Tape (CT) packaging suits automated pick-and-place assembly, while Bulk packaging accommodates manual or alternative assembly processes. Electrical and mechanical specifications remain identical regardless of packaging format.

Q: Why do some substitute parts list higher resistance values than BA479S-TAP?

A: Resistance characteristics vary with current measurement conditions. BA479S-TAP specifies 50Ohm @ 1.5mA, while MACOM substitutes typically specify resistance at higher current levels (50mA to 100mA). Higher current measurement conditions generally yield lower resistance values. Circuit design must account for the specific resistance-current relationship of the selected substitute.

Q: Are all substitute parts suitable for RF switching applications?

A: All listed substitutes are PIN diode configurations designed for RF applications. Substitution suitability depends on matching the circuit's voltage, current, and impedance requirements. Higher-voltage substitutes (MA4P7104B-401T, MA4P4006B-402) introduce increased capacitance, which may affect RF performance in sensitive impedance-matching circuits.

Q: What is the significance of MSL (Moisture Sensitivity Level) differences?

A: MSL 1 (Unlimited) indicates no moisture sensitivity restrictions during storage and handling. MSL 3 (168 Hours) requires controlled humidity storage and limits exposure time before soldering. For applications with standard manufacturing environments, both MSL levels are acceptable. High-volume or extended-storage applications should prioritize MSL 1 parts.

Q: Can BA479S-TAP be substituted with MA4P4006B-402 in a 30V circuit?

A: Yes, mechanically and electrically. MA4P4006B-402 provides 600V voltage rating, 12W power dissipation, and axial packaging. However, the 2.2pF capacitance at 100V is significantly higher than BA479S-TAP's 0.5pF, which may degrade RF performance in impedance-sensitive circuits. Substitution is valid only if circuit design tolerates increased capacitance.

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