1N5934B Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5934B is a 24 V, 3 W through-hole axial zener diode manufactured by onsemi. This component is classified as obsolete, though 22,632 units remain in stock as new original inventory. The 1N5934B operates across a temperature range of -65°C to 200°C and is designed for applications requiring voltage regulation and transient protection in electronic circuits. Due to its obsolete status, equivalent and substitute parts with active product status are available to support ongoing design requirements and procurement continuity.

Key Parameters

Parameter	1N5934B Specification
Voltage - Zener (Nom)	24 V
Power - Max	3 W
Tolerance	±5%
Impedance (Max)	19 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 18.2 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA
Operating Temperature	-65°C ~ 200°C
Mounting Type	Through Hole
Package / Case	DO-204AL, DO-41, Axial
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the 1N5934B is determined by matching the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Zener voltage: 24 V nominal
Tolerance: ±5%
Impedance (Max): 19 Ohms
Reverse leakage current: 1 µA @ 18.2 V
Forward voltage: 1.5 V @ 200 mA
Mounting type: Through Hole
Package compatibility: DO-204AL, DO-41, or Axial

Secondary Consideration:

Operating temperature range: -65°C to 200°C preferred; -65°C to 175°C acceptable for most applications
Power dissipation: 3 W nominal; lower power ratings (1.25 W, 1.3 W, 1 W) are acceptable for applications with reduced power requirements

Substitute parts are classified into two categories:

Direct Equivalents maintain all electrical specifications and power rating of the 1N5934B while offering active product status and improved compliance certifications.

Similar Alternatives share the same zener voltage and tolerance but differ in power dissipation, impedance, or temperature range. These parts are suitable for applications where the full 3 W power rating is not required.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Power (Max)	Tolerance	Zzt (Max)	Vf (Max) @ If	Temp Range	Package	Product Status	RoHS Status
1N5934B	onsemi	24 V	3 W	±5%	19 Ω	1.5 V @ 200 mA	-65°C ~ 200°C	DO-204AL, DO-41, Axial	Obsolete	Non-compliant
1N5934BRLG	onsemi	24 V	3 W	±5%	19 Ω	1.5 V @ 200 mA	-65°C ~ 200°C	DO-204AL, DO-41, Axial	Active	ROHS3 Compliant
1N5934BRNG	onsemi	24 V	3 W	±5%	19 Ω	1.5 V @ 200 mA	-65°C ~ 200°C	DO-204AL, DO-41	Active	ROHS3 Compliant
1N5934BG	Microsemi Corporation	24 V	1.25 W	±5%	19 Ω	1.2 V @ 200 mA	-65°C ~ 175°C	DO-204AL, DO-41	Active	Non-compliant
1N4749A-TR	Vishay General Semiconductor	24 V	1.3 W	±5%	25 Ω	1.2 V @ 200 mA	-65°C ~ 175°C	DO-204AL, DO-41	Active	ROHS3 Compliant
1N4749A,113	Nexperia USA Inc.	24 V	1 W	±5%	25 Ω	1.2 V @ 200 mA	-65°C ~ 200°C	DO-204AL, DO-41	Active	ROHS3 Compliant
1N4749A,133	NXP Semiconductors	24 V	1 W	±5%	25 Ω	1.2 V @ 200 mA	-65°C ~ 200°C	DO-204AL, DO-41	Active	Not specified
1N4474	Microchip Technology	24 V	1.5 W	±5%	16 Ω	1.5 V @ 1 A	-65°C ~ 175°C	DO-204AL, DO-41	Active	Non-compliant
1N5934A	Microchip Technology	24 V	1.25 W	±10%	19 Ω	1.2 V @ 200 mA	-65°C ~ 175°C	DO-204AL, DO-41	Active	Non-compliant
1N4116-1	Microchip Technology	24 V	500 mW	±5%	150 Ω	1.1 V @ 200 mA	-65°C ~ 175°C	DO-204AH, DO-35	Active	Non-compliant

Engineering Selection Recommendations

Direct Equivalent Selection:

The 1N5934BRLG and 1N5934BRNG are direct electrical and mechanical equivalents of the 1N5934B. Both parts are manufactured by onsemi and maintain identical specifications for zener voltage (24 V), power dissipation (3 W), tolerance (±5%), impedance (19 Ω), and operating temperature range (-65°C to 200°C). Both parts carry active product status and ROHS3 compliance, providing superior long-term availability and regulatory alignment compared to the obsolete 1N5934B.

The 1N5934BRLG is supplied in cut tape packaging, while the 1N5934BRNG is supplied in DO-41 package format. Selection between these two should be based on procurement and assembly requirements.

Alternative Selection for Reduced Power Applications:

The 1N5934BG (Microsemi Corporation) provides an alternative with reduced power dissipation (1.25 W) while maintaining the same zener voltage, tolerance, impedance, and forward voltage characteristics. This part is suitable for applications where the full 3 W power rating is not required. Operating temperature range is reduced to -65°C to 175°C.

The 1N4749A-TR (Vishay General Semiconductor) offers 1.3 W power dissipation with ROHS3 compliance and AEC-Q101 automotive qualification. Impedance is 25 Ω, slightly higher than the 1N5934B. This part is suitable for automotive and industrial applications with moderate power requirements.

The 1N4749A,113 (Nexperia USA Inc.) and 1N4749A,133 (NXP Semiconductors) provide 1 W power dissipation with active product status and ROHS3 compliance. Both maintain the 24 V zener voltage and ±5% tolerance. The 1N4749A,113 supports the full -65°C to 200°C temperature range, while 1N4749A,133 specifications do not specify upper temperature limit in provided data.

Lower Power Alternative:

The 1N4116-1 (Microchip Technology) is a 500 mW zener diode with 24 V nominal voltage. This part is suitable only for low-power applications and uses the DO-35 (DO-204AH) package, which differs from the 1N5934B axial package. Impedance is significantly higher at 150 Ω.

Selection Based on Compliance:

For applications requiring RoHS3 compliance, select 1N5934BRLG, 1N5934BRNG, 1N4749A-TR, or 1N4749A,113.

For applications requiring automotive qualification, select 1N4749A-TR (AEC-Q101 qualified).

For applications with no specific compliance requirements, 1N5934BG and 1N4474 provide active product status with equivalent electrical performance.

Frequently Asked Questions (FAQ)

Q: Can the 1N5934BRLG directly replace the 1N5934B in existing designs?

A: Yes. The 1N5934BRLG is a direct equivalent with identical electrical specifications (24 V, 3 W, ±5%, 19 Ω impedance) and the same operating temperature range (-65°C to 200°C). The primary difference is improved product status (active vs. obsolete) and ROHS3 compliance. Mechanical compatibility is maintained through the DO-204AL/DO-41 axial package format.

Q: What is the difference between 1N5934BRLG and 1N5934BRNG?

A: Both parts are manufactured by onsemi with identical electrical specifications. The 1N5934BRLG is supplied in cut tape (CT) packaging, while the 1N5934BRNG is supplied in bulk DO-41 package format. Selection depends on assembly equipment and procurement preferences. Electrical performance is identical.

Q: Can I use a 1 W zener diode (1N4749A series) instead of the 3 W 1N5934B?

A: Substitution is possible only if the application does not require the full 3 W power dissipation capability. The 1N4749A series maintains the same 24 V zener voltage and ±5% tolerance, ensuring voltage regulation performance. However, if the circuit design relies on the 3 W thermal capacity for transient protection or continuous operation, a lower-power substitute will not perform adequately. Verify application power requirements before substitution.

Q: Why does the 1N5934BG have lower power rating (1.25 W) than the 1N5934B (3 W)?

A: The 1N5934BG is a variant of the same base product (1N5934) with reduced power dissipation capability. Both maintain identical zener voltage (24 V), tolerance (±5%), and impedance (19 Ω). The lower power rating reflects different thermal design and package optimization. Selection should be based on actual circuit power requirements.

Q: Is the 1N4116-1 a suitable replacement for the 1N5934B?

A: The 1N4116-1 shares the same 24 V zener voltage and ±5% tolerance but differs significantly in power dissipation (500 mW vs. 3 W) and package format (DO-35 vs. axial). This part is suitable only for low-power applications and requires mechanical redesign due to package incompatibility. For most applications requiring 3 W capability, this part is not recommended.

Q: What is the impact of impedance differences between substitute parts?

A: Impedance (Zzt) affects dynamic impedance and transient response characteristics. The 1N5934B has 19 Ω impedance. Substitute parts with 19 Ω impedance (1N5934BRLG, 1N5934BRNG, 1N5934BG, 1N5934A) provide identical dynamic performance. Parts with higher impedance (1N4749A series at 25 Ω, 1N4116-1 at 150 Ω) exhibit different transient response. For applications sensitive to dynamic impedance, select substitutes with matching impedance specifications.

Q: Are there temperature range limitations when substituting the 1N5934B?

A: The 1N5934B operates from -65°C to 200°C. Most substitute parts operate to -65°C to 175°C, reducing the upper temperature limit by 25°C. For applications operating above 175°C, select 1N5934BRLG, 1N5934BRNG, or 1N4749A,113, which maintain the full -65°C to 200°C range. For applications with maximum operating temperature below 175°C, all listed substitutes are acceptable.

Q: What packaging options are available for the 1N5934B substitutes?

A: The 1N5934B uses DO-204AL/DO-41 axial package. Direct equivalents (1N5934BRLG, 1N5934BRNG) maintain this package format. Most alternative 24 V zener diodes (1N5934BG, 1N4749A series, 1N4474) also use DO-204AL/DO-41 packages. The 1N4116-1 uses DO-204AH/DO-35 package, which is mechanically incompatible and requires circuit board redesign. Verify package compatibility before final selection.

Q: Which substitute offers the best compliance for new designs?

A: For RoHS3 compliance, select 1N5934BRLG, 1N5934BRNG, 1N4749A-TR, or 1N4749A,113. For automotive applications requiring AEC-Q101 qualification, select 1N4749A-TR. For general industrial applications without specific compliance mandates, 1N5934BRLG or 1N5934BRNG provide the most direct equivalence with improved regulatory status.

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