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1N4733A-T Zener Diode Equivalent & Substitute Parts
Part Overview
The 1N4733A-T is a 5.1 V, 1 W zener diode manufactured by Diodes Incorporated in DO-41 through-hole package. This part is classified as obsolete, though 665 pieces remain in stock as new original inventory. The 1N4733A-T serves voltage regulation and protection applications requiring precise 5.1 V zener voltage with ±5% tolerance and 1 W maximum power dissipation. Equivalent and substitute parts are necessary to ensure design continuity, improve availability, and access active product status alternatives from multiple manufacturers.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Zener (Nom) | 5.1 | V |
| Tolerance | ±5 | % |
| Power - Max | 1 | W |
| Impedance (Max) | 7 | Ohms |
| Current - Reverse Leakage @ Vr | 10 | µA @ 1 V |
| Voltage - Forward (Max) @ If | 1.2 | V @ 200 mA |
| Operating Temperature | -65 to 175 | °C |
| Mounting Type | Through Hole | |
| Package / Case | DO-204AL, DO-41, Axial | |
| RoHS Status | ROHS3 Compliant | |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitute parts for the 1N4733A-T are classified into three categories based on electrical and mechanical compatibility:
Direct Equivalents (Identical Electrical Specifications): Parts with matching zener voltage (5.1 V), tolerance (±5%), power rating (1 W), impedance (7 Ohms), reverse leakage current (10 µA @ 1 V), forward voltage (1.2 V @ 200 mA), and through-hole DO-41 package configuration. These parts differ only in manufacturer, product status, or packaging format (bulk, cut tape).
Active Status Upgrades (Enhanced Availability): Parts meeting all electrical specifications of the main part but with active product status from current manufacturers. These include extended operating temperature ranges (-65°C to 200°C versus -65°C to 175°C) and improved compliance certifications.
Higher Power Alternatives (Functional Upgrades): Parts with identical zener voltage (5.1 V) and tolerance (±5%) but increased power ratings (1.5 W or 3 W). These provide enhanced thermal performance and current handling capability while maintaining voltage regulation characteristics.
Lower Voltage Alternatives (Related Function): Parts with different zener voltage (4.7 V) but similar power rating (1 W) and package configuration, suitable for applications requiring alternative voltage regulation levels.
Substitution eligibility is determined by: zener voltage matching, tolerance compatibility, power rating sufficiency, package type compatibility, and operating temperature range adequacy for the application.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Vz (V) | Tolerance (%) | Power (W) | Zzt (Ohms) | Reverse Leakage (µA) | Vf (V) | Temp Range (°C) | Product Status | Package |
|---|---|---|---|---|---|---|---|---|---|---|
| 1N4733A-T | Diodes Incorporated | 5.1 | ±5 | 1 | 7 | 10 @ 1 V | 1.2 @ 200 mA | -65 to 175 | Obsolete | DO-41 |
| 1N4733A TR PBFREE | Central Semiconductor Corp | 5.1 | ±5 | 1 | 7 | 10 @ 1 V | 1.2 @ 200 mA | -65 to 200 | Active | DO-41 |
| 1N4733A,113 | NXP Semiconductors | 5.1 | ±5 | 1 | 7 | 10 @ 1 V | 1.2 @ 200 mA | -65 to 200 | Active | DO-41 |
| 1N4733AP/TR8 | Microchip Technology | 5.1 | ±5 | 1 | 7 | 10 @ 1 V | 1.2 @ 200 mA | -65 to 150 | Active | DO-204AL (DO-41) |
| 1N4733A | Lumimax Optoelectronic Technology | 5.1 | ±5 | 1 | 7 | 10 @ 1 V | 1.2 @ 200 mA | -65 to 200 | Active | DO-41G |
| 1N4733A,133 | Nexperia USA Inc. | 5.1 | ±5 | 1 | 7 | 10 @ 1 V | 1.2 @ 200 mA | -65 to 200 | Active | DO-41 |
| 1N4733A-T50A | onsemi | 5.1 | ±5 | 1 | 7 | 10 @ 1 V | Not Specified | -65 to 200 | Active | DO-41 |
| 1N4733ATR | onsemi | 5.1 | ±5 | 1 | 7 | 10 @ 1 V | Not Specified | -65 to 200 | Active | DO-41 |
| 1N3825A-1 | Microchip Technology | 4.7 | ±5 | 1 | 8 | 3 @ 2 V | 1.2 @ 200 mA | -65 to 175 | Active | DO-204AL (DO-41) |
| 1N5918B3P-TP | Micro Commercial Co | 5.1 | ±5 | 3 | 4 | 5 @ 2 V | 1.5 @ 200 mA | -55 to 175 | Active | DO-41 |
| 1N5918BP-TP | Micro Commercial Co | 5.1 | ±5 | 1.5 | 4 | 5 @ 2 V | 1.5 @ 200 mA | -55 to 150 | Active | DO-41 |
Engineering Selection Recommendations
For Direct Replacement with Active Product Status:
Select 1N4733A TR PBFREE (Central Semiconductor Corp), 1N4733A,113 (NXP Semiconductors), 1N4733A,133 (Nexperia USA Inc.), 1N4733A-T50A (onsemi), or 1N4733ATR (onsemi). All five parts provide identical electrical specifications to the 1N4733A-T with active product status. NXP Semiconductors and Nexperia USA Inc. variants offer extended operating temperature range to 200°C and superior inventory availability (215,630 and 13,673 pieces respectively). onsemi variants (1N4733A-T50A and 1N4733ATR) provide 16,542 and 1,612 pieces in stock with 200°C maximum operating temperature.
For Temperature-Constrained Applications:
The 1N4733AP/TR8 (Microchip Technology) maintains identical electrical specifications but operates to 150°C maximum. This part is suitable only for applications with maximum operating temperature not exceeding 150°C.
For Enhanced Thermal Performance:
The 1N5918BP-TP (Micro Commercial Co) provides 1.5 W power rating with identical 5.1 V zener voltage, offering 50% increased power dissipation capability. The 1N5918B3P-TP variant provides 3 W power rating for applications requiring substantial thermal margin. Both parts maintain ±5% tolerance and 5.1 V zener voltage specification.
For Alternative Voltage Regulation:
The 1N3825A-1 (Microchip Technology) provides 4.7 V zener voltage with 1 W power rating for applications requiring lower voltage regulation. This part is not RoHS compliant and should be selected only when 4.7 V voltage specification is required.
Compliance Considerations:
All active substitute parts maintain ROHS3 compliance and REACH unaffected status, except 1N3825A-1 which is RoHS non-compliant. All parts carry EAR99 ECCN classification.
Frequently Asked Questions (FAQ)
Q: Can 1N4733A-T be directly replaced with 1N4733A,113 or 1N4733A TR PBFREE?
A: Yes. Both parts provide identical zener voltage (5.1 V), tolerance (±5%), power rating (1 W), impedance (7 Ohms), reverse leakage current (10 µA @ 1 V), and forward voltage (1.2 V @ 200 mA). Both are through-hole DO-41 package devices. The primary differences are manufacturer, product status (active versus obsolete), and operating temperature range (200°C maximum versus 175°C).
Q: What is the difference between 1N4733A-T50A and 1N4733ATR?
A: Both are onsemi manufactured 5.1 V, 1 W zener diodes in DO-41 package with identical electrical specifications. The primary difference is packaging format: 1N4733A-T50A is supplied in cut tape format with 1,612 pieces in stock, while 1N4733ATR is also cut tape with 16,542 pieces in stock. Both operate to -65°C to 200°C temperature range.
Q: Can I use 1N5918BP-TP as a substitute for 1N4733A-T?
A: Yes, with thermal design consideration. The 1N5918BP-TP provides identical 5.1 V zener voltage and ±5% tolerance but offers 1.5 W power rating versus 1 W. This higher power rating provides enhanced thermal performance and current handling. Operating temperature range is -55°C to 150°C, which is narrower than the original part's -65°C to 175°C range.
Q: Why would I select 1N3825A-1 instead of 1N4733A-T?
A: The 1N3825A-1 is selected only when 4.7 V zener voltage is required instead of 5.1 V. It maintains 1 W power rating and ±5% tolerance but is not RoHS compliant. This part is not a direct substitute but a related alternative for different voltage regulation requirements.
Q: What is the significance of the operating temperature range difference between 1N4733AP/TR8 (-65°C to 150°C) and other 1N4733A variants (-65°C to 200°C)?
A: The 1N4733AP/TR8 has a lower maximum operating temperature limit of 150°C compared to 200°C for most active variants. This part is suitable only for applications where the maximum junction temperature does not exceed 150°C. For applications requiring operation to 175°C or higher, select alternatives with extended temperature range.
Q: Are all substitute parts available in the same packaging format?
A: No. The original 1N4733A-T does not specify packaging format. Substitute parts are available in multiple formats: bulk (1N4733A,113), cut tape (1N4733A TR PBFREE, 1N4733AP/TR8, 1N4733A,133, 1N4733A-T50A, 1N4733ATR), and unspecified format (1N4733A from Lumimax). Verify packaging format compatibility with assembly equipment before selection.
Q: What does ROHS3 Compliant status mean for component selection?
A: ROHS3 Compliant indicates the part meets Restriction of Hazardous Substances Directive 3 requirements, restricting lead and other hazardous materials. All active substitute parts except 1N3825A-1 carry ROHS3 compliance. For applications requiring RoHS compliance, avoid 1N3825A-1 which is RoHS non-compliant.
Q: How do I determine if a substitute part is suitable for my application?
A: Verify that the substitute part meets or exceeds the following requirements: zener voltage matches 5.1 V specification, tolerance is ±5% or better, power rating is 1 W or greater, operating temperature range encompasses your application's maximum junction temperature, and package type is compatible with your assembly process. All listed substitute parts meet these criteria except 1N3825A-1 (different voltage) and 1N4733AP/TR8 (lower temperature limit).
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