1N5334B Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5334B is a 3.6 V, 5 W axial through-hole zener diode manufactured by onsemi. This component is classified as obsolete, indicating discontinued production and limited availability through standard distribution channels. The 1N5334B serves voltage regulation and protection applications requiring stable zener voltage characteristics at moderate power levels. Identification of equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for new production builds and field replacements.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	3.6	V
Tolerance	±5%	%
Power - Max	5	W
Impedance (Max)	2.5	Ohms
Current - Reverse Leakage @ Vr	150	µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1.2	V @ 1 A
Operating Temperature Range	-65 to 200	°C
Mounting Type	Through Hole	-
Package / Case	T-18, Axial	-

Substitute Part Grouping Explanation

Substitution of the 1N5334B is determined by electrical and mechanical parameter equivalence. The critical parameters governing substitution are:

Electrical Parameters:

Voltage - Zener (Nom): 3.6 V
Tolerance: ±5%
Power - Max: 5 W
Impedance (Max): 2.5 Ohms
Current - Reverse Leakage @ Vr: 150 µA @ 1 V
Voltage - Forward (Vf) (Max) @ If: 1.2 V @ 1 A

Mechanical Parameters:

Mounting Type: Through Hole
Package / Case: T-18, Axial

Substitute parts must maintain identical electrical specifications and compatible mechanical form factors to ensure functional equivalence in circuit applications. Packaging format variations (bulk versus cut tape) do not affect electrical performance and are acceptable substitutions.

Parameter Comparison

Parameter	1N5334B (onsemi)	1N5334BRLG (onsemi)	1N5334B (Microsemi)
Voltage - Zener (Nom)	3.6 V	3.6 V	3.6 V
Tolerance	±5%	±5%	±5%
Power - Max	5 W	5 W	5 W
Impedance (Max)	2.5 Ohms	2.5 Ohms	2.5 Ohms
Current - Reverse Leakage @ Vr	150 µA @ 1 V	150 µA @ 1 V	150 µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 1 A	1.2 V @ 1 A	1.2 V @ 1 A
Operating Temperature Range	-65 to 200°C	-65 to 200°C	-65 to 150°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	T-18, Axial	T-18, Axial	T-18, Axial
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	RoHS non-compliant

Engineering Selection Recommendations

1N5334BRLG (onsemi) is the primary substitute for the obsolete 1N5334B (onsemi). This part maintains complete electrical equivalence across all specified parameters and is available in active production status. The 1N5334BRLG achieves ROHS3 compliance, providing regulatory advantage for new designs and applications subject to environmental restrictions. Packaging format differs (cut tape versus bulk), but this variation does not affect electrical performance or circuit functionality.

1N5334B (Microsemi Corporation) is an alternative substitute offering identical electrical specifications and active product status. This part maintains the same T-18 axial package configuration and all critical electrical parameters. The operating temperature range is limited to -65 to 150°C compared to the original specification of -65 to 200°C. Selection of the Microsemi variant requires verification that the reduced upper temperature limit (-150°C maximum versus -200°C) is acceptable for the intended application environment.

Frequently Asked Questions (FAQ)

Q: Can the 1N5334BRLG replace the obsolete 1N5334B in existing designs?

A: Yes. The 1N5334BRLG maintains identical electrical specifications including zener voltage (3.6 V), power rating (5 W), impedance (2.5 Ohms), and all other critical parameters. The packaging format difference (cut tape) does not affect electrical performance. This part is the direct functional equivalent.

Q: What is the difference between 1N5334B and 1N5334BRLG?

A: Both parts are manufactured by onsemi and share identical electrical specifications. The primary differences are packaging format (1N5334BRLG is supplied in cut tape format) and compliance status (1N5334BRLG is ROHS3 compliant). The 1N5334BRLG is in active production while the 1N5334B is obsolete.

Q: Can the Microsemi 1N5334B be used as a substitute?

A: The Microsemi 1N5334B is electrically equivalent for all specified parameters. However, the operating temperature range is limited to -65 to 150°C, compared to the original -65 to 200°C specification. This part is suitable only for applications where the maximum operating temperature does not exceed 150°C.

Q: Are there any compliance differences between substitute options?

A: Yes. The 1N5334BRLG (onsemi) is ROHS3 compliant, making it suitable for applications subject to environmental regulations. Both the original 1N5334B (onsemi) and the Microsemi 1N5334B are RoHS non-compliant. For new designs requiring regulatory compliance, the 1N5334BRLG is the appropriate selection.

Q: Does the T-18 axial package remain the same across all substitutes?

A: Yes. All substitute parts maintain the T-18 axial through-hole package configuration, ensuring mechanical compatibility with existing PCB layouts and component mounting procedures.

Q: What is the inventory status of substitute parts?

A: The 1N5334BRLG (onsemi) has 15,300 pieces in stock. The Microsemi 1N5334B has 6,700 pieces in stock. The original onsemi 1N5334B has 6,700 pieces in stock but is classified as obsolete.

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