Equivalent & Substitute Parts for 1N4977 Zener Diode

Part Overview

The 1N4977 from Microchip Technology is a Zener diode with a nominal Zener voltage of 62 V and a power rating of 5 W, provided in a through-hole, axial package. The device is active and currently available in inventory. Finding substitute models is required for supply chain flexibility, design alternatives, or when specific regulatory compliance (such as RoHS) impacts component selection.

Key Parameters

Parameter	1N4977
Manufacturer Part Number	1N4977
Category	Diodes, Zener
Voltage - Zener (Nom) (Vz)	62 V
Tolerance	±5%
Power - Max	5 W
Impedance (Max) (Zzt)	42 Ohms
Current - Reverse Leakage @ Vr	2 µA @ 47.1 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 1 A
Operating Temperature	-65°C ~ 175°C
Mounting Type	Through Hole
Package / Case	E, Axial
RoHS Status	RoHS non-compliant
REACH Status	REACH Unaffected
Product Status	Active

Substitute Part Grouping Explanation

Substitution is permitted strictly between Zener diodes of comparable electrical and mechanical specification. Key substitution criteria include voltage rating, power handling, tolerance, impedance, reverse leakage current, forward voltage, operating temperature, mounting type, and packaging, as well as RoHS and REACH compliance status. The substitute part 1N5373BRLG matches the required product category and package, with allowed deviations defined by the provided parameters.

Parameter Comparison

Parameter	1N4977 (Microchip Technology)	1N5373BRLG (onsemi)
Category	Diodes, Zener	Diodes, Zener
Voltage - Zener (Nom) (Vz)	62 V	68 V
Tolerance	±5%	±5%
Power - Max	5 W	5 W
Impedance (Max) (Zzt)	42 Ohms	44 Ohms
Current - Reverse Leakage @ Vr	2 µA @ 47.1 V	500 nA @ 51.7 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 1 A	1.2 V @ 1 A
Operating Temperature	-65°C ~ 175°C	-65°C ~ 200°C
Mounting Type	Through Hole	Through Hole
Package / Case	E, Axial	T-18, Axial
RoHS Status	RoHS non-compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected
Product Status	Active	Active

Engineering Selection Recommendations

Selection between 1N4977 and 1N5373BRLG should be based on product status and compliance requirements. The main part (1N4977) is RoHS non-compliant, while the substitute part (1N5373BRLG) is ROHS3 compliant. Both parts remain active and have unaffected REACH status. Compliance requirements may necessitate substitution.

Frequently Asked Questions (FAQ)

Q: What are the key factors to consider when substituting 1N4977 with 1N5373BRLG?
A: The allowable parameters for substitution include product category, nominal Zener voltage, tolerance, power rating, impedance, reverse leakage current, forward voltage, operating temperature, mounting type, package/case, product status, RoHS status, and REACH status.

Q: Is the package/case type compatible for direct replacement?
A: Both main and substitute parts utilize axial, through-hole mounting. Package/case types differ (E, Axial vs. T-18, Axial) as per provided data.

Q: Does RoHS compliance differ between substitute parts?
A: Yes, 1N4977 is RoHS non-compliant; 1N5373BRLG is ROHS3 compliant.

Q: Are there differences in operating temperature ranges between the parts?
A: 1N4977 operates between -65°C ~ 175°C; 1N5373BRLG operates between -65°C ~ 200°C.

Q: How does the Zener voltage rating differ between the listed products?
A: 1N4977 specifies a nominal Zener voltage of 62 V; 1N5373BRLG specifies 68 V.

Q: What is the importance of reverse leakage current and impedance values for substitution?
A: Reverse leakage current and impedance define key electrical characteristics that affect substitution within this product category, based only on provided values.

Q: Is product availability affected by the part status?
A: Both parts have “Active” status and are listed as in stock per the provided data.

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