1N2979 Equivalent & Substitute Parts

Part Overview

The 1N2979 is a 10-watt Zener diode manufactured by Solid State Inc., rated at 15 V nominal with ±20% tolerance. This component operates across a temperature range of -65°C to 175°C and features stud mount packaging in the DO-4 form factor. The part is classified as Active and maintains ROHS3 compliance with unlimited moisture sensitivity rating (MSL 1). Substitute parts are necessary to address inventory availability, tolerance requirements, or alternative manufacturer sourcing while maintaining electrical and mechanical compatibility within the specified parameter ranges.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	15	V
Power - Max	10	W
Tolerance	±20%	%
Impedance (Max)	3	Ohms
Voltage - Forward (Max) @ If	1.5 V @ 2 A	V @ A
Operating Temperature	-65 to 175	°C
Mounting Type	Stud Mount	—
Package / Case	DO-203AA, DO-4, Stud	—

Substitute Part Grouping Explanation

Substitution of the 1N2979 is determined by the following critical parameters: nominal Zener voltage (15 V), maximum power dissipation (10 W), impedance specification (3 Ohms maximum), forward voltage characteristics (1.5 V @ 2 A), operating temperature range (-65°C to 175°C), and stud mount mechanical configuration. All substitute parts maintain these core electrical specifications. Tolerance variations (±20%, ±10%, ±5%) represent tighter control grades of the same base device and are acceptable substitutes where the application permits improved accuracy. Packaging variants (Box, Bulk) and manufacturer differences (Solid State Inc., Microchip Technology) do not affect electrical performance when the DO-4 form factor and stud mount configuration are preserved. Compliance status differences are noted for applications requiring specific regulatory adherence.

Parameter Comparison

Parameter	1N2979	1N2979R	1N2979RA	1N2979RB
Manufacturer	Solid State Inc.	Solid State Inc.	Solid State Inc.	Microchip Technology
Voltage - Zener (Nom)	15 V	15 V	15 V	15 V
Tolerance	±20%	±20%	±10%	±5%
Power - Max	10 W	10 W	10 W	10 W
Impedance (Max)	3 Ohms	3 Ohms	3 Ohms	3 Ohms
Voltage - Forward (Max) @ If	1.5 V @ 2 A	1.5 V @ 2 A	1.5 V @ 2 A	1.5 V @ 2 A
Operating Temperature	-65 to 175°C	-65 to 175°C	-65 to 175°C	-65 to 175°C
Mounting Type	Stud Mount	Stud Mount	Stud Mount	Chassis, Stud Mount
Package / Case	DO-203AA, DO-4, Stud	DO-203AA, DO-4, Stud	DO-203AA, DO-4, Stud	DO-203AA, DO-4, Stud
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

1N2979R is a direct parametric equivalent manufactured by Solid State Inc. with identical electrical specifications and ROHS3 compliance. This substitute is suitable for applications where the original part is unavailable and tolerance of ±20% is acceptable. Inventory availability is higher (1209 pcs vs. 743 pcs).

1N2979RA provides improved tolerance control at ±10%, manufactured by Solid State Inc. with ROHS3 compliance. This substitute is appropriate for applications requiring tighter Zener voltage accuracy while maintaining all other electrical and mechanical parameters. Inventory availability is 1113 pcs.

1N2979RB is manufactured by Microchip Technology and offers the tightest tolerance specification at ±5%. This substitute provides superior voltage regulation performance. However, this part is RoHS non-compliant and carries REACH Unaffected status, making it unsuitable for applications requiring ROHS3 compliance. Selection of this part requires explicit verification of regulatory requirements. Inventory availability is highest at 1503 pcs.

All substitute parts maintain active product status and are suitable for the full operating temperature range of -65°C to 175°C.

Frequently Asked Questions (FAQ)

Q: Can 1N2979R be used as a direct replacement for 1N2979?

A: Yes. The 1N2979R maintains identical electrical specifications including 15 V nominal Zener voltage, 10 W maximum power, 3 Ohms impedance, and ±20% tolerance. Both are manufactured by Solid State Inc., feature stud mount configuration, and comply with ROHS3 standards.

Q: What is the difference between 1N2979RA and 1N2979?

A: The 1N2979RA provides tighter tolerance control at ±10% compared to the ±20% tolerance of the 1N2979. All other electrical parameters, mechanical configuration, and compliance status remain identical. This substitute is suitable when improved Zener voltage accuracy is required.

Q: Is 1N2979RB compatible with applications requiring ROHS3 compliance?

A: No. The 1N2979RB is RoHS non-compliant, whereas the 1N2979, 1N2979R, and 1N2979RA are all ROHS3 compliant. Applications subject to RoHS regulations must use one of the compliant alternatives.

Q: Can 1N2979RB be used for improved voltage regulation?

A: Yes. The 1N2979RB offers ±5% tolerance, providing superior voltage regulation compared to the ±20% tolerance of the 1N2979. However, regulatory compliance must be verified before selection, as this part is RoHS non-compliant.

Q: Are all substitute parts available in the same DO-4 stud mount package?

A: Yes. All substitute parts (1N2979R, 1N2979RA, 1N2979RB) are available in DO-203AA, DO-4, Stud package configuration, ensuring mechanical and thermal compatibility with the original 1N2979.

Q: What is the inventory status of each substitute part?

A: 1N2979 has 743 pcs in stock, 1N2979R has 1209 pcs, 1N2979RA has 1113 pcs, and 1N2979RB has 1503 pcs available as new original stock.

Q: Do all substitute parts operate across the same temperature range?

A: Yes. All substitute parts operate across the full temperature range of -65°C to 175°C (TJ), maintaining performance consistency across thermal extremes.

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