Equivalent & Substitute Parts for 1N4976 Zener Diode

Part Overview

The 1N4976 from Microchip Technology is a Zener diode designed for voltage regulation applications. It provides a nominal Zener voltage of 56 V, a maximum power dissipation of 5 W, and offers through-hole axial mounting. The part currently maintains an active product status, but alternative models may be required in design or procurement contexts to address supply chain constraints, compliance differences, or specific project requirements.

Key Parameters

Parameter	1N4976	1N4758A-TAP	BZX55B56-TAP
Manufacturer	Microchip Technology	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division
Category	Diodes, Zener	Diodes, Zener	Diodes, Zener
Voltage - Zener (Nom) (Vz)	56 V	56 V	56 V
Tolerance	±5%	±5%	±2%
Power - Max	5 W	1.3 W	500 mW
Impedance (Max) (Zzt)	35 Ohms	110 Ohms	135 Ohms
Current - Reverse Leakage @ Vr	2 µA @ 42.6 V	5 µA @ 42.6 V	100 nA @ 43 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 1 A	1.2 V @ 200 mA	1.5 V @ 200 mA
Operating Temperature	-65°C ~ 175°C	175°C (TJ)	-65°C ~ 175°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	E, Axial	DO-204AL, DO-41, Axial	DO-204AH, DO-35, Axial
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Substitute Part Grouping Explanation

Equivalent parts are grouped strictly according to key functional and regulatory parameters: nominal Zener voltage, tolerance, maximum power dissipation, impedance, reverse leakage current, forward voltage, operating temperature, mounting type, package, RoHS status, and moisture sensitivity level. Only models explicitly matching or closely aligning with these parameters are listed as substitutes.

Parameter Comparison

Part Number	Manufacturer	Voltage - Zener (Nom)	Tolerance	Power - Max	Impedance (Max) (Zzt)	Current - Reverse Leakage @ Vr	Voltage - Forward (Vf) (Max) @ If	Operating Temperature	Mounting Type	Package / Case	RoHS Status	MSL	Product Status
1N4976	Microchip Technology	56 V	±5%	5 W	35 Ohms	2 µA @ 42.6 V	1.5 V @ 1 A	-65°C ~ 175°C	Through Hole	E, Axial	RoHS non-compliant	1 (Unlimited)	Active
1N4758A-TAP	Vishay General Semiconductor - Diodes Division	56 V	±5%	1.3 W	110 Ohms	5 µA @ 42.6 V	1.2 V @ 200 mA	175°C (TJ)	Through Hole	DO-204AL, DO-41, Axial	ROHS3 Compliant	1 (Unlimited)	Active
BZX55B56-TAP	Vishay General Semiconductor - Diodes Division	56 V	±2%	500 mW	135 Ohms	100 nA @ 43 V	1.5 V @ 200 mA	-65°C ~ 175°C	Through Hole	DO-204AH, DO-35, Axial	ROHS3 Compliant	1 (Unlimited)	Active

Engineering Selection Recommendations

All listed substitute parts maintain active product status and meet moisture sensitivity level 1 (Unlimited). Both substitute parts, 1N4758A-TAP and BZX55B56-TAP, are ROHS3 compliant, while the 1N4976 is RoHS non-compliant. Certification for automotive grade (AEC-Q101) is stated for both substitute parts. The base electrical parameters and packaging types indicate suitability for through-hole designs as per the provided criteria.

Frequently Asked Questions (FAQ)

Q1: What are the critical substitution criteria for the 1N4976 Zener diode?
A1: Critical criteria include nominal Zener voltage, tolerance, maximum power rating, impedance, reverse leakage current, forward voltage rating, operating temperature, mounting type, package specification, RoHS status, and moisture sensitivity level.

Q2: How do the substitute Zener diodes compare in terms of voltage and tolerance?
A2: All listed substitutes have a nominal Zener voltage of 56 V. Tolerance varies: 1N4758A-TAP matches the ±5% tolerance of the main part; BZX55B56-TAP offers ±2% tolerance.

Q3: Are the substitute parts compatible with through-hole mounting and axial package requirements?
A3: Yes, all substitute parts are through-hole mount and have axial lead packages as specified in their documentation.

Q4: What regulatory or compliance differences exist between these Zener diodes?
A4: The main part, 1N4976, is RoHS non-compliant. Both 1N4758A-TAP and BZX55B56-TAP are ROHS3 compliant and automotive grade (AEC-Q101 qualified).

Q5: Does the maximum power rating differ among substitute parts?
A5: Yes. 1N4976 supports up to 5 W, 1N4758A-TAP up to 1.3 W, and BZX55B56-TAP up to 500 mW. Selection should be based on specific application requirements indicated in provided parameters.

Q6: Is the operating temperature comparable across all parts?
A6: All parts support a maximum operating temperature up to 175°C as documented.

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