BZX79-B24,113 Equivalent & Substitute Parts

Part Overview

The BZX79-B24,113 is a Zener diode manufactured by Nexperia USA Inc., rated for 24 V nominal Zener voltage with 400 mW maximum power dissipation. This component is classified as an Active product and is RoHS3 compliant. The device is packaged in DO-204AH (DO-35) axial configuration for through-hole mounting applications.

Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter tolerances while maintaining functional compatibility in the target application circuit. Alternative Zener diodes with matching nominal voltage and suitable power ratings serve as direct replacements when design constraints permit.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	24	V
Tolerance	±2%	-
Power - Max	400	mW
Impedance (Max)	70	Ohms
Current - Reverse Leakage @ Vr	50 nA @ 16.8 V	-
Voltage - Forward (Max) @ If	900 mV @ 10 mA	-
Operating Temperature Range	-65°C to 200°C	-
Mounting Type	Through Hole	-
Package / Case	DO-204AH, DO-35, Axial	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the BZX79-B24,113 is determined by the following critical parameters:

Mandatory Matching Criteria:

Voltage - Zener (Nom): 24 V (exact match required)
Mounting Type: Through Hole (mechanical compatibility)
Package Configuration: Axial leads (PCB layout compatibility)

Allowable Variation Criteria:

Tolerance: ±2% to ±5% (wider tolerance acceptable in applications with margin)
Power - Max: 400 mW minimum (higher power ratings acceptable for thermal margin)
Impedance (Max): 70 Ohms baseline (lower impedance values acceptable)
Current - Reverse Leakage: 50 nA baseline (higher leakage acceptable within circuit design limits)
Operating Temperature Range: -65°C to 200°C baseline (matching or extended range acceptable)
RoHS Compliance: ROHS3 preferred (non-compliant parts identified for legacy applications)

Substitute parts identified: 1N5934BRNG and 1N5359B/TR12 both provide 24 V Zener voltage with through-hole axial mounting. Power ratings and impedance characteristics differ to accommodate various circuit requirements.

Parameter Comparison

Parameter	BZX79-B24,113	1N5934BRNG	1N5359B/TR12
Manufacturer	Nexperia USA Inc.	onsemi	Microchip Technology
Voltage - Zener (Nom)	24 V	24 V	24 V
Tolerance	±2%	±5%	±5%
Power - Max	400 mW	3 W	5 W
Impedance (Max)	70 Ohms	19 Ohms	3.5 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 16.8 V	1 µA @ 18.2 V	500 nA @ 17.3 V
Voltage - Forward (Max) @ If	900 mV @ 10 mA	1.5 V @ 200 mA	1.2 V @ 1 A
Operating Temperature Range	-65°C to 200°C	-65°C to 200°C	-65°C to 150°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AH, DO-35	DO-204AL, DO-41	T-18
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant
Product Status	Active	Active	Active

Engineering Selection Recommendations

1N5934BRNG (onsemi)

The 1N5934BRNG is a direct substitute for applications requiring higher power dissipation capability. This device maintains the 24 V Zener voltage specification, extends the maximum power rating to 3 W, and preserves the full operating temperature range (-65°C to 200°C). RoHS3 compliance is maintained. The DO-41 package provides mechanical compatibility with through-hole PCB layouts. Lower impedance (19 Ohms) and higher reverse leakage (1 µA) are acceptable in circuits designed for the BZX79-B24,113 baseline specifications.

1N5359B/TR12 (Microchip Technology)

The 1N5359B/TR12 is suitable for applications where maximum power dissipation and thermal margin are critical design factors. This device provides 5 W maximum power rating with the lowest impedance (3.5 Ohms) among the substitute options. The 24 V Zener voltage is maintained. The operating temperature range is limited to -65°C to 150°C, which is acceptable for most industrial and commercial applications. RoHS non-compliance status requires evaluation against project compliance requirements. The T-18 package configuration differs from the original DO-35, requiring PCB layout verification.

Compliance and Status Considerations

Both substitute parts maintain Active product status and REACH Unaffected designation. The 1N5934BRNG preserves RoHS3 compliance matching the original part. The 1N5359B/TR12 is RoHS non-compliant and is suitable only for applications where RoHS compliance is not mandated.

Frequently Asked Questions (FAQ)

Q: Can the 1N5934BRNG replace the BZX79-B24,113 in any application?

A: The 1N5934BRNG provides electrical compatibility based on matching 24 V Zener voltage and through-hole axial mounting. The higher power rating (3 W vs. 400 mW) and lower impedance (19 Ohms vs. 70 Ohms) are acceptable in circuits designed for the original specification. Physical package differences (DO-41 vs. DO-35) require PCB layout verification for lead spacing and component footprint compatibility.

Q: What is the significance of the ±2% tolerance on the BZX79-B24,113 compared to ±5% on the substitutes?

A: The ±2% tolerance on the BZX79-B24,113 provides tighter Zener voltage regulation. Substitute parts with ±5% tolerance exhibit wider voltage variation across the production range. Applications requiring precise voltage regulation within ±2% must use the original part or evaluate circuit design margins to accommodate the wider tolerance of substitute parts.

Q: Are package differences between DO-35, DO-41, and T-18 critical for substitution?

A: Package differences affect PCB layout compatibility, lead spacing, and component footprint dimensions. Physical substitution requires verification that the substitute package fits the existing PCB design. Electrical performance is independent of package type when all other parameters match.

Q: Why is the 1N5359B/TR12 marked as RoHS non-compliant?

A: RoHS non-compliance indicates the device may contain restricted substances not permitted in RoHS3 regulated applications. This part is suitable only for applications where RoHS compliance is not required by project specifications, customer requirements, or regulatory standards.

Q: Can the 1N5359B/TR12 be used in applications requiring -65°C to 200°C operation?

A: The 1N5359B/TR12 operating temperature range is limited to -65°C to 150°C. Applications requiring operation above 150°C must use the BZX79-B24,113 or 1N5934BRNG, both rated to 200°C.

Q: What does impedance (Zzt) represent in Zener diode selection?

A: Impedance (Zzt) is the dynamic impedance of the Zener diode in the reverse breakdown region. Lower impedance values provide better voltage regulation and lower output impedance. The BZX79-B24,113 (70 Ohms) has higher impedance than both substitutes, affecting voltage stability under load variations.

Q: Is reverse leakage current a critical parameter for substitution?

A: Reverse leakage current affects circuit quiescent current and power consumption in standby conditions. The BZX79-B24,113 specifies 50 nA at 16.8 V, while substitutes range from 500 nA to 1 µA. Higher leakage is acceptable in applications with adequate current budgets but may impact low-power circuit performance.

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