1N4563B Equivalent & Substitute Parts Reference

Part Overview

The 1N4563B, manufactured by Microchip Technology, is a 6.8 V Zener diode with a maximum power dissipation of 50 W, supplied in a TO-204AD (TO-3) through hole package. This device, classified under Diodes, Zener, features ±5% voltage tolerance and a maximum impedance of 0.16 Ohms. With an operating temperature range of -65°C to 175°C, it is designed for high-power voltage regulation applications. The 1N4563B is currently listed as obsolete, making it necessary to identify equivalent and substitute models to support ongoing maintenance and design efforts using compatible electrical and mechanical specifications.

Key Parameters

Parameter	1N4563B
Manufacturer	Microchip Technology
Category	Diodes, Zener
Voltage - Zener (Nom) (Vz)	6.8 V
Tolerance	±5%
Power - Max	50 W
Impedance (Max) (Zzt)	0.16 Ohms
Current - Reverse Leakage @ Vr	10 µA @ 2 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 10 A
Operating Temperature	-65°C ~ 175°C
Mounting Type	Through Hole
Package / Case	TO-204AD (TO-3)
RoHS Status	RoHS non-compliant
REACH Status	REACH Unaffected
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute and equivalent Zener diodes for the 1N4563B are selected strictly on a match basis for the following critical parameters: Zener voltage (Vz), voltage tolerance, maximum power dissipation, maximum impedance (Zzt), reverse leakage current at specified voltage, forward voltage at specified current, operating temperature range, mounting type, and package/case. Only diodes that meet all these criteria, as explicitly provided, with matching electrical and mechanical characteristics within the specified limits, are included as substitutes.

The following parameters were applied as the basis for selection:

Zener Voltage (6.8 V)
Tolerance (±5%)
Power Rating (50 W)
Impedance (Max 0.16–0.2 Ohms)
Reverse Leakage Current
Voltage - Forward
Operating Temperature (-65°C ~ 175°C)
Package / Case (TO-204AD/TO-3)
Mounting Type (Through Hole)
Product Compliance (RoHS, REACH)

Parameter Comparison

Parameter	1N4563B	1N2804RB	1N2804B
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology
Category	Diodes, Zener	Diodes, Zener	Diodes, Zener
Voltage - Zener (Nom) (Vz)	6.8 V	6.8 V	6.8 V
Tolerance	±5%	±5%	±5%
Power - Max	50 W	50 W	50 W
Impedance (Max) (Zzt)	0.16 Ohms	0.2 Ohms	0.2 Ohms
Current - Reverse Leakage @ Vr	10 µA @ 2 V	150 µA @ 4.5 V	150 µA @ 4.5 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 10 A	1.5 V @ 10 A	1.5 V @ 10 A
Operating Temperature	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-204AD (TO-3)	TO-204AD (TO-3)	TO-204AD (TO-3)
RoHS Status	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

The 1N4563B Zener diode is designated as obsolete, while the substitute parts 1N2804RB and 1N2804B remain active. All listed parts are RoHS non-compliant and REACH unaffected, providing consistency in compliance status. For continuity in production or field support where legacy compliance requirements are maintained, the substitutes 1N2804RB and 1N2804B are suitable due to matching key specifications and identical packaging.

Frequently Asked Questions (FAQ)

What parameters must align when selecting a Zener diode equivalent for the 1N4563B?
Selection requires strict matching of Zener voltage, voltage tolerance, maximum power dissipation, impedance, reverse leakage current at specified test voltage, forward voltage at specified current, operating temperature, mechanical mounting, and package/case type.

Are the substitute parts mechanically identical to the 1N4563B?
Yes. All substitute parts are specified in the TO-204AD (TO-3) through hole package and share the same mechanical form factor.

Does RoHS compliance differ among these parts?
No. The 1N4563B, 1N2804RB, and 1N2804B are all RoHS non-compliant.

Is there any difference in electrical performance among the substitutes for the 1N4563B?
The main differences are in the maximum impedance and reverse leakage specifications encountered at differing test voltages, as indicated in the parameter comparison table.

Can the substitute parts be used in the same temperature environments as the 1N4563B?
Yes. All listed parts are rated for operation from -65°C to 175°C.

Do mounting and case compatibility need to be reviewed for substituting these parts?
No. All parts use the TO-204AD (TO-3) case with through hole mounting, ensuring mechanical compatibility for direct replacement.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message