1N4728AGE3 Equivalent & Substitute Parts

Part Overview

The 1N4728AGE3 is a Zener diode rated at 3.3 V, 1 W with ±5% tolerance, housed in a DO-41 through-hole package. Manufactured by Microchip Technology, this component functions as a voltage regulator in electronic circuits. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts maintain identical electrical specifications while offering active product status and improved availability.

Key Parameters

Parameter	Value
Voltage - Zener (Nom) (Vz)	3.3 V
Tolerance	±5%
Power - Max	1 W
Impedance (Max) (Zzt)	10 Ohms
Current - Reverse Leakage @ Vr	100 µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA
Operating Temperature	-65°C ~ 175°C
Mounting Type	Through Hole
Package / Case	DO-204AL, DO-41, Axial
Supplier Device Package	DO-41

Substitute Part Grouping Explanation

Substitution of the 1N4728AGE3 is determined by the following critical parameters:

Electrical Specifications:

Zener voltage: 3.3 V (nominal)
Power dissipation: 1 W maximum
Impedance: 10 Ohms maximum
Reverse leakage current: 100 µA @ 1 V
Forward voltage: 1.2 V @ 200 mA maximum
Operating temperature range: -65°C to 175°C minimum

Mechanical Specifications:

Package type: DO-41 through-hole
Mounting configuration: Axial leads

Substitute parts are grouped into two categories:

Category 1: Microchip Technology Military-Grade Equivalents (JAN/JANTX/JANTXV series) These parts maintain the 3.3 V, 1 W specification with varying tolerance grades (±5%, ±2%, ±1%) and military qualification per MIL-PRF-19500/115. All are active products with enhanced reliability specifications.

Category 2: Commercial-Grade Equivalent (1N4728AG) This part is a direct parametric equivalent from Microchip Technology with identical electrical and mechanical specifications, active product status, and RoHS3 compliance.

Category 3: Alternative Manufacturer (1N4728A by Lumimax) This part provides equivalent electrical performance with extended operating temperature range (-65°C to 200°C) and RoHS compliance, offering a direct functional substitute from an alternative manufacturer.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (W)	Zzt (Ohms)	Reverse Leakage @ 1V (µA)	Vf @ 200mA (V)	Temp Range (°C)	Product Status	Grade
1N4728AGE3	Microchip Technology	3.3	±5%	1	10	100	1.2	-65 ~ 175	Obsolete	Commercial
1N4728AG	Microchip Technology	3.3	±5%	1	10	100	1.2	-65 ~ 175	Active	Commercial
JAN1N3821A-1	Microchip Technology	3.3	±5%	1	10	100	1.2	-65 ~ 175	Active	Military
JAN1N3821C-1	Microchip Technology	3.3	±2%	1	10	100	1.2	-65 ~ 175	Active	Military
JAN1N3821D-1	Microchip Technology	3.3	±1%	1	10	100	1.2	-65 ~ 175	Active	Military
JANTX1N3821A-1	Microchip Technology	3.3	±5%	1	10	100	1.2	-65 ~ 175	Active	Military
JANTX1N3821C-1	Microchip Technology	3.3	±2%	1	10	100	1.2	-65 ~ 175	Active	Military
JANTX1N3821D-1	Microchip Technology	3.3	±1%	1	10	100	1.2	-65 ~ 175	Active	Military
JANTXV1N3821A-1	Microchip Technology	3.3	±5%	1	10	75	1.2	-65 ~ 175	Active	Military
JANTXV1N3821D-1	Microchip Technology	3.3	±1%	1	10	75	1.2	-65 ~ 175	Active	Military
1N4728A	Lumimax Optoelectronic Technology	3.3	±5%	1	10	100	1.2	-65 ~ 200	Active	Commercial

Engineering Selection Recommendations

For Direct Replacement (Active Product Status): The 1N4728AG from Microchip Technology is the primary substitute for the obsolete 1N4728AGE3. Both parts share identical electrical and mechanical specifications with ±5% tolerance. The 1N4728AG is active, RoHS3 compliant, and maintains full compatibility with existing circuit designs.

For Military or High-Reliability Applications: The JAN1N3821 series (JAN1N3821A-1, JAN1N3821C-1, JAN1N3821D-1) provides military-grade alternatives with MIL-PRF-19500/115 qualification. These parts are active products suitable for defense and aerospace applications. Selection within this series depends on tolerance requirements: ±5% (A-grade), ±2% (C-grade), or ±1% (D-grade).

For Enhanced Reliability with Tighter Specifications: The JANTX and JANTXV series offer military-qualified alternatives with improved reverse leakage characteristics. JANTXV variants specify 75 µA @ 1 V reverse leakage compared to 100 µA @ 1 V in standard grades, providing superior performance in precision voltage regulation applications.

For Extended Temperature Range: The 1N4728A from Lumimax Optoelectronic Technology extends the operating temperature range to -65°C to 200°C while maintaining all other electrical specifications. This part is RoHS compliant and suitable for applications requiring operation at elevated temperatures.

Compliance Considerations:

1N4728AG: RoHS3 compliant, REACH unaffected
1N4728A: RoHS compliant, REACH unaffected
JAN/JANTX/JANTXV series: RoHS non-compliant, REACH unaffected (military-grade parts)

Frequently Asked Questions (FAQ)

Q: Can the 1N4728AG directly replace the obsolete 1N4728AGE3? A: Yes. The 1N4728AG is a direct parametric equivalent with identical voltage (3.3 V), power rating (1 W), tolerance (±5%), impedance (10 Ohms), and package (DO-41). Both are through-hole components with the same mechanical footprint and electrical performance.

Q: What is the difference between the JAN, JANTX, and JANTXV variants? A: All three series are military-qualified per MIL-PRF-19500/115. The primary difference is reverse leakage current: JAN/JANTX variants specify 100 µA @ 1 V, while JANTXV variants specify 75 µA @ 1 V. JANTXV parts offer tighter leakage specifications for precision applications.

Q: Should I select a tighter tolerance grade (±2% or ±1%) for my application? A: Tolerance selection depends on circuit requirements. The original 1N4728AGE3 specifies ±5% tolerance. Tighter tolerances (±2% C-grade or ±1% D-grade) are available in the JAN1N3821 and JANTX series if voltage regulation precision is critical. Standard ±5% tolerance is sufficient for most general-purpose voltage regulation applications.

Q: Is the 1N4728A from Lumimax compatible with the 1N4728AGE3? A: Yes. The 1N4728A maintains identical electrical specifications (3.3 V, 1 W, ±5%, 10 Ohms impedance) and package type (DO-41). The extended operating temperature range (-65°C to 200°C versus -65°C to 175°C) provides additional margin for high-temperature environments.

Q: Are military-grade parts (JAN series) necessary for commercial applications? A: Military-grade parts are not required for standard commercial applications. The 1N4728AG provides sufficient performance and is the recommended choice for cost-effective replacement. Military-grade alternatives are specified only when MIL-PRF-19500/115 qualification is a contractual or design requirement.

Q: What is the significance of RoHS compliance in substitute selection? A: RoHS compliance indicates lead-free construction and restriction of hazardous substances. The 1N4728AG and 1N4728A are RoHS compliant, suitable for applications with environmental or regulatory requirements. Military-grade JAN/JANTX/JANTXV parts are RoHS non-compliant, reflecting their military specification basis.

Q: Can I use these Zener diodes interchangeably in voltage regulation circuits? A: Yes, within the specified electrical parameters. All listed substitutes maintain the 3.3 V nominal voltage, 1 W power rating, and DO-41 package. Circuit performance remains consistent across all equivalent parts when electrical specifications are matched.

Q: What packaging options are available for these Zener diodes? A: All listed parts use the DO-41 through-hole package with axial leads. The DO-204AL designation and DO-41 supplier package indicate identical physical form factor. No surface-mount or alternative package options are available in this substitute list.

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