1N4737A_S00Z Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4737A_S00Z is a through-hole zener diode manufactured by onsemi, rated for 7.5 V nominal zener voltage and 1 W maximum power dissipation in a DO-41 package. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design requirements and procurement needs. Substitute parts must maintain identical electrical specifications and mechanical compatibility to ensure direct replacement capability in existing circuit designs.

Key Parameters

Parameter	Value
Voltage - Zener (Nom) (Vz)	7.5 V
Tolerance	±5%
Power - Max	1 W
Impedance (Max) (Zzt)	4 Ohms
Current - Reverse Leakage @ Vr	10 µA @ 5 V
Operating Temperature	-65°C ~ 200°C
Mounting Type	Through Hole
Package / Case	DO-204AL, DO-41, Axial
Supplier Device Package	DO-41

Substitute Part Grouping Explanation

Substitute parts for the 1N4737A_S00Z are selected based on strict parametric equivalence across all critical electrical and mechanical specifications. The substitution criteria are:

Electrical Parameters (Must Match Exactly):

Voltage - Zener (Nom) (Vz): 7.5 V
Tolerance: ±5%
Power - Max: 1 W
Impedance (Max) (Zzt): 4 Ohms
Current - Reverse Leakage @ Vr: 10 µA @ 5 V
Operating Temperature Range: -65°C ~ 200°C

Mechanical Parameters (Must Match Exactly):

Mounting Type: Through Hole
Package / Case: DO-204AL, DO-41, Axial
Supplier Device Package: DO-41

All identified substitute parts meet these criteria and are available from active manufacturers with current product status.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (Nom)	Tolerance	Power - Max	Zzt (Max)	Reverse Leakage @ Vr	Operating Temp	Package	Product Status
1N4737A_S00Z	onsemi	7.5 V	±5%	1 W	4 Ohms	10 µA @ 5 V	-65°C ~ 200°C	DO-41	Obsolete
1N4737A	Lumimax Optoelectronic Technology	7.5 V	±5%	1 W	4 Ohms	10 µA @ 5 V	-65°C ~ 200°C	DO-41G	Active
1N4737A BK PBFREE	Central Semiconductor Corp	7.5 V	±5%	1 W	4 Ohms	10 µA @ 5 V	-65°C ~ 200°C	DO-41	Active
1N4737A-T50A	Fairchild Semiconductor	7.5 V	±5%	1 W	4 Ohms	10 µA @ 5 V	-65°C ~ 200°C	DO-41	Active

Engineering Selection Recommendations

1N4737A (Lumimax Optoelectronic Technology)

This part provides parametric equivalence with active product status. The supplier device package designation DO-41G indicates a variant of the standard DO-41 package. RoHS compliance status is confirmed. This option supports 30,400 units in current inventory.

1N4737A BK PBFREE (Central Semiconductor Corp)

This part delivers full parametric equivalence with ROHS3 compliance certification. The lead-free designation (PBFREE) indicates compliance with RoHS directives. Active product status with 829 units in inventory. Packaging is specified as Box format.

1N4737A-T50A (Fairchild Semiconductor)

This part maintains complete parametric equivalence with active product status. Bulk packaging format is specified. Highest inventory availability at 100,041 units. All electrical and mechanical specifications align with the original component.

All three substitute parts satisfy the parametric requirements for direct replacement of the obsolete 1N4737A_S00Z. Selection among these options depends on procurement preferences, inventory availability, packaging requirements, and compliance certifications applicable to the end application.

Frequently Asked Questions (FAQ)

Q: Can the 1N4737A substitute directly for the 1N4737A_S00Z in existing designs?

A: Yes. The 1N4737A from Lumimax Optoelectronic Technology, 1N4737A BK PBFREE from Central Semiconductor Corp, and 1N4737A-T50A from Fairchild Semiconductor all maintain identical electrical specifications (7.5 V zener voltage, 1 W power rating, ±5% tolerance, 4 Ohms maximum impedance, 10 µA reverse leakage) and mechanical compatibility (through-hole mounting, DO-41 package). Direct substitution is supported without circuit modification.

Q: What is the significance of the DO-41G package designation?

A: The DO-41G designation indicates a variant of the standard DO-41 axial package. The "G" suffix typically denotes a specific manufacturing or dimensional variant. All substitute parts maintain compatibility with DO-41 package specifications and mechanical footprints.

Q: Are there compliance differences between the substitute options?

A: The 1N4737A BK PBFREE from Central Semiconductor Corp carries ROHS3 compliance certification, indicating lead-free manufacturing. The 1N4737A from Lumimax is RoHS compliant. All parts maintain REACH Unaffected status and EAR99 export classification. Selection should align with application-specific compliance requirements.

Q: What inventory considerations apply to these substitutes?

A: The 1N4737A-T50A from Fairchild Semiconductor offers the highest inventory availability at 100,041 units. The 1N4737A from Lumimax provides 30,400 units. The 1N4737A BK PBFREE from Central Semiconductor Corp has 829 units available. Procurement decisions should account for project timeline and volume requirements.

Q: Do all substitute parts operate across the same temperature range?

A: Yes. All substitute parts operate across the identical temperature range of -65°C to 200°C (junction temperature), matching the original 1N4737A_S00Z specification.

Q: What packaging formats are available for these substitutes?

A: The 1N4737A from Lumimax is supplied in standard packaging. The 1N4737A BK PBFREE from Central Semiconductor Corp is packaged in Box format. The 1N4737A-T50A from Fairchild Semiconductor is supplied in Bulk format. All maintain the DO-41 supplier device package specification.

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