1N4739A_S00Z Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4739A_S00Z is a 9.1 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 alternatives 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 applications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	9.1	V
Tolerance	±5%	%
Power - Maximum	1	W
Impedance (Maximum)	5	Ohms
Current - Reverse Leakage @ Vr	10	µA @ 7 V
Operating Temperature Range	-65 to 200	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—

Substitute Part Grouping Explanation

Substitute parts for the 1N4739A_S00Z are qualified based on strict electrical and mechanical parameter matching. All substitute candidates must satisfy the following criteria:

Electrical Parameters (Mandatory Match):

Zener voltage: 9.1 V nominal
Tolerance: ±5%
Maximum power dissipation: 1 W
Maximum impedance: 5 Ohms
Reverse leakage current: 10 µA @ 7 V
Operating temperature range: -65°C to 200°C

Mechanical Parameters (Mandatory Match):

Mounting type: Through Hole
Package designation: DO-41 or DO-204AL (equivalent axial packages)

Substitute parts identified in this reference meet all specified electrical and mechanical parameters, enabling direct replacement without circuit redesign or performance degradation.

Parameter Comparison

Parameter	1N4739A_S00Z (onsemi)	1N4739A (Lumimax)	1N4739A-T50A (Fairchild)
Voltage - Zener (Nom)	9.1 V	9.1 V	9.1 V
Tolerance	±5%	±5%	±5%
Power - Max	1 W	1 W	1 W
Impedance (Max)	5 Ohms	5 Ohms	5 Ohms
Current - Reverse Leakage @ Vr	10 µA @ 7 V	10 µA @ 7 V	10 µA @ 7 V
Operating Temperature	-65°C ~ 200°C	-65°C ~ 200°C	-65°C ~ 200°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial
Product Status	Obsolete	Active	Active
RoHS Status	Not specified	RoHS Compliant	Not specified
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Primary Substitute: 1N4739A (Lumimax Optoelectronic Technology)

The 1N4739A from Lumimax meets all electrical and mechanical specifications of the obsolete 1N4739A_S00Z. This part carries active product status and RoHS compliance certification, supporting modern procurement and environmental regulatory requirements. Inventory availability (12,377 pcs) ensures supply continuity.

Secondary Substitute: 1N4739A-T50A (Fairchild Semiconductor)

The 1N4739A-T50A from Fairchild Semiconductor provides parametric equivalence across all critical electrical specifications. This part maintains active product status with substantial inventory (17,831 pcs). The DO-204AL package designation is functionally equivalent to DO-41 for through-hole applications.

Both substitute parts are qualified for direct replacement in applications requiring 9.1 V, 1 W Zener diode functionality. Selection between alternatives may be based on supplier availability, procurement lead times, and organizational qualification requirements.

Frequently Asked Questions (FAQ)

Q: Can the 1N4739A (Lumimax) directly replace the obsolete 1N4739A_S00Z (onsemi)?

A: Yes. Both parts share identical electrical specifications (9.1 V nominal, ±5% tolerance, 1 W maximum power, 5 Ohms maximum impedance, 10 µA reverse leakage @ 7 V) and compatible through-hole DO-41 packaging. No circuit modifications are required.

Q: What is the difference between DO-41 and DO-204AL package designations?

A: DO-41 and DO-204AL are equivalent package designations for the same axial through-hole diode form factor. Both accommodate identical lead spacing and mounting hole requirements.

Q: Are the Lumimax and Fairchild substitutes interchangeable?

A: Yes. Both 1N4739A (Lumimax) and 1N4739A-T50A (Fairchild) meet all specified electrical and mechanical parameters. Selection between them depends on supplier availability and organizational procurement preferences.

Q: Does the RoHS compliance status of the Lumimax part affect compatibility?

A: RoHS compliance indicates environmental regulatory adherence and does not affect electrical or mechanical compatibility. The Lumimax 1N4739A is suitable for applications requiring RoHS-compliant components.

Q: What operating temperature range applies to all substitute parts?

A: All substitute parts operate across -65°C to 200°C junction temperature range, matching the original 1N4739A_S00Z specification.

Q: Are there any forward voltage specifications provided for the substitutes?

A: The Lumimax 1N4739A specifies forward voltage of 1.2 V maximum @ 200 mA. This parameter is not provided for the original or Fairchild parts but does not affect Zener diode substitution suitability.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message