1N4749A_S00Z Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4749A_S00Z is a 24 V, 1 W Zener diode manufactured by onsemi in a through-hole DO-41 package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design and procurement requirements. The part maintains full electrical and mechanical compatibility with specified alternatives while ensuring continuity in circuit applications requiring 24 V Zener regulation at 1 W power dissipation.

Substiute Parts

1N4749A_S00Z

onsemiIn Stock: 8211N4749A_S00Z Datasheet

Current PartRFQ

1N4749A

Lumimax Optoelectronic TechnologyIn Stock: 372261N4749A Datasheet

SimilarRFQ

BZX85C24-T50R

Fairchild SemiconductorIn Stock: 21838BZX85C24-T50R Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1N4749A_S00Z is determined by strict equivalence across the following critical parameters:

Electrical Parameters (Must Match):

• Zener voltage: 24 V nominal
• Power rating: 1 W maximum
• Voltage tolerance: ±5%
• Impedance (maximum): 25 Ohms
• Operating temperature range: -65°C to 200°C

Mechanical Parameters (Must Match):

• Mounting type: Through Hole
• Package classification: DO-41 or DO-204AL (equivalent designations)
• Lead configuration: Axial

Substitute parts are grouped into two categories: direct part number equivalents and parametric equivalents. Both categories satisfy all electrical and mechanical requirements specified for the main part.

Parameter Comparison

Engineering Selection Recommendations

1N4749A (Lumimax Optoelectronic Technology)

This substitute is a direct part number equivalent with active product status. All electrical parameters match the original specification exactly. The component is RoHS compliant and maintains REACH unaffected status. Inventory availability is substantial at 37,200 pieces. This part is the primary substitute for applications requiring direct replacement with current manufacturing support.

BZX85C24-T50R (Fairchild Semiconductor)

This substitute is a parametric equivalent with active product status. All critical electrical parameters match the original specification. The reverse leakage current specification (500 nA @ 17 V) is superior to the original part (5 µA @ 18.2 V), indicating lower leakage performance. The component maintains REACH unaffected status. Inventory availability is 21,822 pieces. This part is suitable for applications where improved leakage characteristics provide design benefit. The DO-204AL package designation is equivalent to DO-41.

Both substitutes satisfy all mandatory electrical and mechanical requirements. Selection between them depends on procurement availability, leakage performance requirements, and compliance certifications applicable to the end application.

Frequently Asked Questions (FAQ)

Q: Can the 1N4749A from Lumimax be used as a direct replacement for the onsemi 1N4749A_S00Z?

A: Yes. The Lumimax 1N4749A is a direct part number equivalent with identical electrical specifications (24 V, 1 W, ±5% tolerance, 25 Ohms impedance) and identical package configuration (DO-41 through-hole). The component is active and RoHS compliant.

Q: What is the difference between the BZX85C24-T50R and the original 1N4749A_S00Z?

A: The BZX85C24-T50R is a parametric equivalent with identical Zener voltage (24 V), power rating (1 W), tolerance (±5%), and impedance (25 Ohms). The primary difference is reverse leakage current: BZX85C24-T50R specifies 500 nA @ 17 V compared to 5 µA @ 18.2 V for the original part. This represents lower leakage performance in the Fairchild device. Both use equivalent DO-41/DO-204AL packages.

Q: Are DO-41 and DO-204AL packages interchangeable?

A: Yes. DO-204AL and DO-41 are equivalent package designations for the same through-hole axial lead configuration. All three substitute parts use this package type and are mechanically interchangeable.

Q: What is the operating temperature range for these substitutes?

A: All three parts (original and both substitutes) operate across -65°C to 200°C junction temperature, ensuring thermal compatibility across the full specified range.

Q: Which substitute should be selected for new designs?

A: For new designs, either the Lumimax 1N4749A or Fairchild BZX85C24-T50R is appropriate. The Lumimax part provides direct part number continuity. The Fairchild part offers superior reverse leakage characteristics. Selection depends on procurement strategy, compliance requirements, and specific circuit leakage performance needs.

Q: Are these parts RoHS compliant?

A: The Lumimax 1N4749A is explicitly RoHS compliant. The Fairchild BZX85C24-T50R lists RoHS status as not applicable. Both maintain REACH unaffected status. Compliance requirements for the end application determine which part is suitable.