1N4728A-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4728A-TP is a 3.3 V, 1 W Zener diode manufactured by Micro Commercial Co in a through-hole DO-41G package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. The 1N4728A-TP maintains electrical and mechanical specifications consistent with multiple active alternatives from established semiconductor manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	3.3	V
Tolerance	±5	%
Power - Maximum	1	W
Impedance (Maximum)	10	Ohms
Current - Reverse Leakage @ Vr	100	µA @ 1 V
Voltage - Forward (Maximum) @ 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

Substitution of the 1N4728A-TP is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Substitution Parameters:

Voltage - Zener (Nominal): 3.3 V
Tolerance: ±5%
Power - Maximum: 1 W
Impedance (Maximum): 10 Ohms
Current - Reverse Leakage @ Vr: 100 µA @ 1 V
Voltage - Forward (Maximum) @ If: 1.2 V @ 200 mA
Operating Temperature Range: -65°C to 200°C (or higher minimum)
Mounting Type: Through Hole
Package / Case: DO-204AL, DO-41, or Axial equivalent

All substitute parts listed maintain identical electrical specifications and compatible package configurations. Parts are categorized as Direct Manufacturer equivalents (identical part numbers from different manufacturers), Similar parts (minor package designation variations), or Parametric Equivalents (matching all electrical parameters with potential product status differences).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (V)	Tolerance (%)	Power (W)	Zzt (Ohms)	Reverse Leakage (µA @ 1V)	Vf Max (V @ 200mA)	Temp Range (°C)	Package	Product Status
1N4728A-TP	Micro Commercial Co	3.3	±5	1	10	100	1.2	-65 to 200	DO-41G	Obsolete
1N4728A	Lumimax Optoelectronic Technology	3.3	±5	1	10	100	1.2	-65 to 200	DO-41G	Active
1N4728A,133	NXP USA Inc.	3.3	±5	1	10	100	1.2	-65 to 200	DO-41	Active
1N4728A-T50A	onsemi	3.3	±5	1	10	100	Not specified	-65 to 200	DO-41	Active
1N4728A G	Microsemi Corporation	3.3	±5	1	10	100	1.2	-65 to 150	DO-204AL (DO-41)	Active
1N4728A TR	Central Semiconductor Corp	3.3	±5	1	10	100	1.2	-65 to 200	DO-41	Obsolete
1N4728A,113	NXP Semiconductors	3.3	±5	1	10	100	1.2	-65 to 200	DO-41	Active
1N4728ATR	Fairchild Semiconductor	3.3	±5	1	10	100	Not specified	-65 to 200	DO-204AL (DO-41)	Active
1N4728G	Taiwan Semiconductor Corporation	3.3	±5	1	10	100	1.2	-65 to 200	DO-204AL (DO-41)	Active

Engineering Selection Recommendations

Primary Substitutes (Active Status, Full Compliance):

1N4728A (Lumimax Optoelectronic Technology) - Direct electrical and mechanical equivalent with active product status. Identical specifications across all critical parameters. RoHS Compliant.
1N4728A,133 (NXP USA Inc.) - Direct equivalent with active status. Bulk packaging available. Maintains all electrical specifications and operating temperature range.
1N4728A,113 (NXP Semiconductors) - Parametric equivalent with active status. Bulk packaging. Full compliance with electrical specifications and temperature range.

Secondary Substitutes (Active Status, Minor Considerations):

1N4728A-T50A (onsemi) - Active equivalent in Cut Tape packaging. ROHS3 Compliant. Identical electrical specifications. Forward voltage specification not provided in documentation.
1N4728ATR (Fairchild Semiconductor) - Active equivalent with DO-204AL (DO-41) package designation. Identical electrical specifications. Forward voltage specification not provided in documentation.
1N4728G (Taiwan Semiconductor Corporation) - Active equivalent in Tape & Reel packaging. ROHS3 Compliant. Identical specifications across all parameters.

Conditional Substitutes (Temperature Range Limitation):

1N4728A G (Microsemi Corporation) - Active equivalent with reduced maximum operating temperature of 150°C versus 200°C. Suitable for applications not requiring full temperature range. All other electrical parameters identical.

Obsolete Alternatives (Not Recommended for New Designs):

1N4728A TR (Central Semiconductor Corp) - Obsolete status. Parametric equivalent with identical electrical specifications but discontinued product line.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 1N4728A-TP with any of the listed alternatives?

A: Yes, all listed parts maintain identical electrical specifications (3.3 V nominal, 1 W power, ±5% tolerance, 10 Ohms impedance, 100 µA reverse leakage, 1.2 V forward voltage). Package compatibility exists across DO-41, DO-204AL, and axial configurations. Select active-status parts for new designs.

Q: What is the difference between Direct Manufacturer, Similar, and Parametric Equivalent classifications?

A: Direct Manufacturer equivalents share identical part numbers across different manufacturers with identical specifications. Similar parts have minor package designation variations (e.g., DO-41 vs. DO-204AL) but maintain electrical equivalence. Parametric Equivalents match all electrical specifications but may have different product status or minor documentation variations.

Q: Does the 1N4728A G from Microsemi Corporation work as a substitute despite the lower maximum temperature rating?

A: The 1N4728A G operates to 150°C maximum versus 200°C for the original part. This substitute is suitable for applications with operating temperatures not exceeding 150°C. All other electrical parameters are identical. Verify application temperature requirements before selection.

Q: What packaging options are available among the substitute parts?

A: Substitute parts are available in multiple packaging configurations: DO-41G (Lumimax), DO-41 (NXP USA, onsemi, Central Semiconductor), DO-204AL (DO-41) (Microsemi, Fairchild, Taiwan Semiconductor), Cut Tape (onsemi), Tape & Reel (Taiwan Semiconductor), and Bulk (NXP USA, NXP Semiconductors, Fairchild). Select packaging based on procurement and assembly requirements.

Q: Are all substitute parts RoHS compliant?

A: RoHS compliance status varies. Lumimax 1N4728A is RoHS Compliant. onsemi 1N4728A-T50A and Taiwan Semiconductor 1N4728G are ROHS3 Compliant. NXP USA 1N4728A,133 and NXP Semiconductors 1N4728A,113 compliance status is not specified in documentation. Verify compliance requirements for your application.

Q: Which substitute offers the best inventory availability?

A: NXP USA Inc. 1N4728A,133 maintains the highest inventory level at 53,896 pieces. Lumimax 1N4728A offers 20,200 pieces. Fairchild 1N4728ATR provides 12,090 pieces. onsemi 1N4728A-T50A maintains 6,810 pieces. Inventory levels are subject to change; verify current availability with suppliers.

Q: Can I use the 1N4728A TR from Central Semiconductor Corp?

A: The 1N4728A TR is classified as obsolete. While it maintains identical electrical specifications to the original 1N4728A-TP, obsolete parts present supply chain risks. Active alternatives are recommended for new designs and ongoing production.

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