1N4977 Zener Diode 62V 5W Axial - Equivalent & Substitute Parts

Part Overview

The 1N4977 is a through-hole axial zener diode rated for 62 V nominal zener voltage and 5 W maximum power dissipation, manufactured by Semtech Corporation. This component is classified as a general-purpose voltage regulation and transient suppression device. The 1N4977 is currently discontinued at DiGi Electronics, making identification of functionally equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	62	V
Tolerance	±5%	%
Power - Max	5	W
Impedance (Max)	42	Ohms
Current - Reverse Leakage @ Vr	2	µA @ 47.1 V
Operating Temperature Range	-55 to 175	°C
Mounting Type	Through Hole	—
Package / Case	Axial	—

Substitute Part Grouping Explanation

Substitute parts for the 1N4977 are identified based on the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): 62 V ±5% tolerance
Power - Max: 5 W
Impedance (Max): 42 Ohms
Mounting Type: Through Hole
Package / Case: Axial

Grouping Logic:

Group 1 - Direct Electrical Equivalent (62 V Rating): The 1N5372BRLG manufactured by onsemi meets all primary electrical specifications of the 1N4977. Both devices specify 62 V nominal zener voltage, 5 W maximum power, ±5% tolerance, and 42 Ohms maximum impedance. Both are packaged in axial through-hole configuration. The 1N5372BRLG is currently active in production with 4,300 units in stock.

Group 2 - Voltage Variant (68 V Rating): The 1N5373BRLG manufactured by onsemi shares identical power rating (5 W), impedance specification (44 Ohms maximum), and axial through-hole packaging. However, this device specifies 68 V nominal zener voltage, representing a 9.7% increase from the 1N4977 specification. This part is suitable only for applications where the higher zener voltage is acceptable within circuit design margins. The 1N5373BRLG is currently active with 17,865 units in stock.

Parameter Comparison

Parameter	1N4977 (Original)	1N5372BRLG (Group 1)	1N5373BRLG (Group 2)
Manufacturer	Semtech Corporation	onsemi	onsemi
Voltage - Zener (Nom)	62 V	62 V	68 V
Tolerance	±5%	±5%	±5%
Power - Max	5 W	5 W	5 W
Impedance (Max)	42 Ohms	42 Ohms	44 Ohms
Current - Reverse Leakage @ Vr	2 µA @ 47.1 V	500 nA @ 47.1 V	500 nA @ 51.7 V
Operating Temperature Range	-55 to 175 °C	-65 to 200 °C	-65 to 200 °C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	Axial	Axial	Axial
Product Status	Discontinued	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Preferred): The 1N5372BRLG is the primary substitute for the 1N4977. This part maintains identical electrical specifications (62 V, 5 W, ±5% tolerance, 42 Ohms impedance) and axial through-hole packaging. The 1N5372BRLG is currently in active production status with robust inventory availability (4,300 units). Both onsemi compliance certifications (ROHS3 Compliant, REACH Unaffected) exceed the original part's compliance profile. The extended operating temperature range (-65 to 200 °C versus -55 to 175 °C) provides additional design margin.

For Voltage-Variant Applications: The 1N5373BRLG may be selected only when circuit design specifications permit operation at 68 V zener voltage. This part shares identical power rating and axial packaging with the original device. The 1N5373BRLG offers superior inventory availability (17,865 units) and identical compliance certifications. Selection of this part requires explicit verification that the 9.7% voltage increase does not violate circuit voltage regulation or transient suppression requirements.

Compliance and Procurement Considerations: Both substitute parts carry ROHS3 compliance and REACH Unaffected status, meeting current regulatory requirements. Both are supplied in Cut Tape (CT) packaging format. The discontinuation of the original 1N4977 necessitates transition to one of these active alternatives for new procurement and long-term design support.

Frequently Asked Questions (FAQ)

Q: Can the 1N5372BRLG be used as a direct drop-in replacement for the 1N4977?

A: Yes. The 1N5372BRLG maintains identical zener voltage (62 V), power rating (5 W), tolerance (±5%), impedance (42 Ohms), and axial through-hole packaging. Both devices are functionally equivalent for voltage regulation and transient suppression applications operating at 62 V.

Q: What is the difference between the 1N5372BRLG and 1N5373BRLG?

A: The primary difference is zener voltage rating. The 1N5372BRLG specifies 62 V (matching the original 1N4977), while the 1N5373BRLG specifies 68 V. Both share identical 5 W power rating and axial packaging. The 1N5373BRLG is suitable only for applications where 68 V zener voltage is acceptable.

Q: Are there packaging differences between these substitute parts?

A: All three parts (1N4977, 1N5372BRLG, 1N5373BRLG) use axial through-hole packaging. The 1N5372BRLG and 1N5373BRLG are supplied in Cut Tape (CT) format. No mechanical redesign is required for PCB layout or assembly.

Q: What is the reverse leakage current difference between the 1N4977 and 1N5372BRLG?

A: The 1N4977 specifies 2 µA reverse leakage at 47.1 V, while the 1N5372BRLG specifies 500 nA at the same voltage. The 1N5372BRLG exhibits lower reverse leakage, which may improve circuit performance in high-impedance applications.

Q: Are the substitute parts compliant with current regulatory standards?

A: Yes. Both the 1N5372BRLG and 1N5373BRLG are ROHS3 Compliant and REACH Unaffected. Both parts meet current environmental and hazardous substance regulations.

Q: What is the inventory status of these substitute parts?

A: The 1N5372BRLG has 4,300 units in stock. The 1N5373BRLG has 17,865 units in stock. Both parts are currently in active production status.

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