BA479S-TR RF PIN Diode Equivalent & Substitute Parts

Part Overview

The BA479S-TR 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 format and is designed for RF applications requiring low capacitance and controlled impedance characteristics. The part is Active status and RoHS3 compliant.

Substitute parts are necessary when the BA479S-TR is unavailable, when alternative packaging formats are required, or when application requirements demand higher voltage ratings, increased power dissipation, or enhanced temperature operating ranges beyond the original specification.

Key Parameters

Parameter	BA479S-TR
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-TR is determined by the following electrical and mechanical criteria:

Primary Substitution Criteria:

Diode Type: PIN - Single (all substitutes maintain this classification)
Package / Case: Axial format (mechanical compatibility with DO-35 footprint)
Voltage - Peak Reverse (Max): Minimum 30V (substitutes rated at 30V or higher are acceptable)
Current - Max: Minimum 50 mA (substitutes rated at 50 mA or higher are acceptable)
Operating Temperature: Minimum 125°C (substitutes with equal or extended range are acceptable)
RoHS Status: ROHS3 Compliant (regulatory requirement maintained)
Product Status: Active (availability and ongoing support)

Secondary Parameters for Compatibility Assessment:

Capacitance @ Vr, F: Lower or equal values preferred for RF performance
Resistance @ If, F: Lower or equal values preferred for RF performance
Power Dissipation (Max): Higher ratings provide design margin

All six substitute parts meet or exceed the minimum electrical requirements of the BA479S-TR while maintaining axial packaging compatibility.

Parameter Comparison

Part Number	Manufacturer	Voltage - Peak Reverse (Max)	Current - Max	Operating Temperature	Package / Case	RoHS Status	Product Status
BA479S-TR	Vishay General Semiconductor	30V	50 mA	125°C (TJ)	DO-204AH, DO-35, Axial	ROHS3 Compliant	Active
MA4P1200NM-401T	MACOM Technology Solutions	100V	Not specified	-55°C ~ 175°C (TJ)	Axial	ROHS3 Compliant	Active
MA4P4001B-402	MACOM Technology Solutions	100V	100 mA	-55°C ~ 175°C (TJ)	Axial	ROHS3 Compliant	Active
MA4P4002B-402	MACOM Technology Solutions	200V	100 mA	-55°C ~ 175°C (TJ)	Axial	ROHS3 Compliant	Active
MA4P4006B-402	MACOM Technology Solutions	600V	Not specified	-55°C ~ 175°C (TJ)	Axial	ROHS3 Compliant	Active
MA4P4301B-402	MACOM Technology Solutions	100V	100 mA	-55°C ~ 175°C (TJ)	Axial	ROHS3 Compliant	Active
MA4P7102B-401T	MACOM Technology Solutions	200V	Not specified	-55°C ~ 175°C (TJ)	Axial	ROHS3 Compliant	Active
MA4P7104B-401T	MACOM Technology Solutions	400V	50 mA	-55°C ~ 175°C (TJ)	Axial	ROHS3 Compliant	Active

Engineering Selection Recommendations

All substitute parts listed are Active status products with ROHS3 compliance, meeting regulatory requirements equivalent to the BA479S-TR. Selection among substitutes depends on application voltage and temperature requirements:

For applications requiring 30V operation with standard temperature range: MA4P1200NM-401T, MA4P4001B-402, and MA4P4301B-402 provide 100V ratings with extended operating temperature ranges (-55°C ~ 175°C), offering design margin and improved thermal performance compared to the original 125°C maximum.

For applications requiring higher voltage ratings: MA4P4002B-402 (200V), MA4P7102B-401T (200V), MA4P7104B-401T (400V), and MA4P4006B-402 (600V) accommodate circuits with elevated voltage requirements while maintaining axial packaging compatibility.

For applications requiring maximum current capacity: MA4P4001B-402, MA4P4002B-402, and MA4P4301B-402 are rated for 100 mA, doubling the current capacity of the BA479S-TR.

All substitutes maintain PIN diode single-element architecture and axial package format, ensuring mechanical and functional compatibility with BA479S-TR circuit designs.

Frequently Asked Questions (FAQ)

Q: Can MA4P7104B-401T directly replace BA479S-TR in a 30V circuit? A: Yes. MA4P7104B-401T is rated for 400V peak reverse voltage, which exceeds the 30V requirement. The 50 mA maximum current matches the BA479S-TR specification. Axial packaging ensures mechanical compatibility.

Q: What is the primary difference between BA479S-TR and MACOM substitute parts? A: MACOM substitutes feature extended operating temperature ranges (-55°C ~ 175°C) compared to BA479S-TR (125°C maximum), and most offer higher voltage ratings and power dissipation capabilities. All maintain PIN diode architecture and axial packaging.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts carry ROHS3 Compliant certification, matching the regulatory status of BA479S-TR.

Q: Which substitute provides the closest electrical match to BA479S-TR? A: MA4P7104B-401T matches the 50 mA current rating and provides 400V voltage rating with extended temperature range. MA4P1200NM-401T offers 100V rating with extended temperature capability.

Q: Can I use a 600V-rated diode in a 30V application? A: Yes. MA4P4006B-402 is rated for 600V peak reverse voltage, which is suitable for 30V applications. Higher voltage ratings provide design margin and do not degrade performance in lower-voltage circuits.

Q: What packaging formats are available among substitutes? A: All substitute parts use axial packaging. Specific packaging options include Cut Tape (CT), Bulk, and Tray formats, providing flexibility for different procurement and assembly requirements.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message