1N4739A Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4739A is a 9.1 V, 1 W Zener diode in DO-41 axial through-hole package manufactured by Nexperia USA Inc. This component is classified as Active and maintains full RoHS3 compliance. The 1N4739A serves voltage regulation and protection applications requiring stable reverse breakdown characteristics at 9.1 V nominal. Substitute parts are identified based on identical electrical specifications and compatible package configurations to support procurement flexibility and supply chain continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	9.1	V
Tolerance	±5%	%
Power - Max	1	W
Impedance (Max)	5	Ohms
Current - Reverse Leakage @ Vr	10	µA @ 7 V
Voltage - Forward (Vf) (Max) @ If	1.2	V @ 200 mA
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 are qualified based on the following criteria:

Electrical Parameters (Must Match):

Voltage - Zener (Nom): 9.1 V
Tolerance: ±5%
Power - Max: 1 W
Impedance (Max): 5 Ohms
Current - Reverse Leakage @ Vr: 10 µA @ 7 V
Voltage - Forward (Vf) (Max) @ If: 1.2 V @ 200 mA
Operating Temperature Range: -65°C to 200°C

Mechanical Parameters (Must Match):

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

All identified substitute parts maintain identical electrical performance and physical compatibility with the original 1N4739A specification. Packaging format variations (Cut Tape, Bulk) do not affect functional equivalence.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Zzt (Max)	Ir @ Vr	Vf (Max) @ If	Temp Range	Package	RoHS Status
1N4739A,113	Nexperia USA Inc.	9.1 V	±5%	1 W	5 Ohms	10 µA @ 7 V	1.2 V @ 200 mA	-65 to 200°C	DO-41	ROHS3 Compliant
1N4739A,133	NXP USA Inc.	9.1 V	±5%	1 W	5 Ohms	10 µA @ 7 V	1.2 V @ 200 mA	-65 to 200°C	DO-41	Not Specified
1N4739A	Lumimax Optoelectronic Technology	9.1 V	±5%	1 W	5 Ohms	10 µA @ 7 V	1.2 V @ 200 mA	-65 to 200°C	DO-41G	RoHS Compliant
1N4739A TR PBFREE	Central Semiconductor Corp	9.1 V	±5%	1 W	5 Ohms	10 µA @ 7 V	1.2 V @ 200 mA	-65 to 200°C	DO-41	ROHS3 Compliant
1N4739A-T50A	Fairchild Semiconductor	9.1 V	±5%	1 W	5 Ohms	10 µA @ 7 V	Not Specified	-65 to 200°C	DO-204AL (DO-41)	Not Specified
1N4739ATR	Fairchild Semiconductor	9.1 V	±5%	1 W	5 Ohms	10 µA @ 7 V	Not Specified	-65 to 200°C	DO-204AL (DO-41)	Not Specified

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

1N4739A,133 (NXP USA Inc.) and 1N4739A TR PBFREE (Central Semiconductor Corp) are direct parametric equivalents with identical electrical specifications and DO-41 package configuration. Both maintain full RoHS3 compliance status equivalent to the original part.

Secondary Substitutes (Compatible with Package Notation Variance):

1N4739A-T50A and 1N4739ATR (both Fairchild Semiconductor) provide electrical equivalence with DO-204AL (DO-41) package designation. These parts satisfy all electrical parameters and mounting requirements. RoHS compliance status is not specified for these variants.

Alternative Manufacturer Source:

1N4739A (Lumimax Optoelectronic Technology) offers parametric equivalence with RoHS compliance. Package designation is listed as DO-41G, maintaining mechanical compatibility with standard DO-41 through-hole applications.

Selection among qualified substitutes is determined by procurement availability, packaging format requirements (Cut Tape vs. Bulk), and compliance certification needs for the end application.

Frequently Asked Questions (FAQ)

Q: Can 1N4739A,133 replace 1N4739A,113 in existing designs?

A: Yes. Both parts share identical electrical specifications (9.1 V nominal, 1 W power rating, ±5% tolerance) and DO-41 package configuration. The numeric suffix indicates packaging format variation only (Bulk vs. Cut Tape), not functional difference.

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

A: DO-204AL is the formal JEDEC package designation; DO-41 is the industry shorthand reference for the same axial through-hole package. Parts specified as DO-204AL (DO-41) are mechanically and electrically identical to DO-41 designated parts.

Q: Are Fairchild Semiconductor 1N4739A-T50A and 1N4739ATR interchangeable?

A: Yes. Both parts are manufactured by Fairchild Semiconductor with identical electrical parameters (9.1 V, 1 W, ±5% tolerance) and DO-204AL (DO-41) package. The suffix designations reflect internal Fairchild part numbering conventions without affecting functional equivalence.

Q: Does the Lumimax 1N4739A part meet RoHS requirements?

A: Yes. The Lumimax 1N4739A is RoHS Compliant. This satisfies RoHS compliance requirements for applications requiring lead-free construction.

Q: What is the significance of "TR PBFREE" in the Central Semiconductor part number?

A: "TR" indicates tape reel packaging format (Cut Tape). "PBFREE" designates lead-free (RoHS3 compliant) construction. The part maintains full electrical equivalence to the original 1N4739A specification.

Q: Can these substitute parts be used in high-temperature applications?

A: Yes. All substitute parts maintain the operating temperature range of -65°C to 200°C, supporting high-temperature circuit applications within this specification window.

Q: Are there inventory considerations when selecting among substitute parts?

A: Inventory levels vary by part number and packaging format. 1N4739ATR (Fairchild) shows highest availability at 36,200 units. Selection should account for procurement lead times and supply chain requirements for production schedules.

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