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1N4733A-TP Zener Diode Equivalent & Substitute Parts
Part Overview
The 1N4733A-TP is a 5.1 V, 1 W Zener diode manufactured by Micro Commercial Co in a through-hole DO-41G package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The 1N4733A-TP functions as a voltage regulation and transient protection device in electronic circuits requiring stable 5.1 V reference voltage or overvoltage clamping.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Zener (Nominal) | 5.1 | V |
| Tolerance | ±5 | % |
| Power - Maximum | 1 | W |
| Impedance (Maximum) | 7 | Ohms |
| Current - Reverse Leakage @ Vr | 10 | 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 1N4733A-TP is determined by strict equivalence across the following critical parameters:
Electrical Parameters (Must Match):
- Zener voltage: 5.1 V nominal
- Tolerance: ±5%
- Maximum power dissipation: 1 W
- Maximum impedance: 7 Ohms
- Reverse leakage current: 10 µA @ 1 V
- Forward voltage: 1.2 V @ 200 mA
Mechanical Parameters (Must Match):
- Mounting type: Through Hole
- Package family: DO-204AL, DO-41, or Axial equivalent
Operating Conditions (Must Match or Exceed):
- Operating temperature range: -65°C to 200°C minimum
Substitute parts are grouped into three categories based on their relationship to the main part:
Direct Manufacturer Equivalents: Parts with identical electrical and mechanical specifications from alternative manufacturers, maintaining full functional interchangeability.
Similar Parts: Parts with equivalent electrical specifications but minor package designation variations (DO-41 vs. DO-204AL) that remain mechanically compatible.
Parametric Equivalents: Parts meeting all electrical and mechanical requirements with active product status, suitable for new designs and ongoing production.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Vz (V) | Tolerance (%) | Power (W) | Zzt (Ohms) | Leakage (µA @ 1V) | Vf (V @ 200mA) | Temp Range (°C) | Package | Product Status |
|---|---|---|---|---|---|---|---|---|---|---|
| 1N4733A-TP | Micro Commercial Co | 5.1 | ±5 | 1 | 7 | 10 | 1.2 | -65 to 200 | DO-41G | Obsolete |
| 1N4733A | Lumimax Optoelectronic Technology | 5.1 | ±5 | 1 | 7 | 10 | 1.2 | -65 to 200 | DO-41G | Active |
| 1N4733A,133 | Nexperia USA Inc. | 5.1 | ±5 | 1 | 7 | 10 | 1.2 | -65 to 200 | DO-41 | Active |
| 1N4733A-T50A | onsemi | 5.1 | ±5 | 1 | 7 | 10 | Not Specified | -65 to 200 | DO-41 | Active |
| 1N4733AP/TR8 | Microchip Technology | 5.1 | ±5 | 1 | 7 | 10 | 1.2 | -65 to 150 | DO-204AL (DO-41) | Active |
| 1N4733A TR PBFREE | Central Semiconductor Corp | 5.1 | ±5 | 1 | 7 | 10 | 1.2 | -65 to 200 | DO-41 | Active |
| 1N4733A,113 | NXP Semiconductors | 5.1 | ±5 | 1 | 7 | 10 | 1.2 | -65 to 200 | DO-41 | Active |
| 1N4733ATR | onsemi | 5.1 | ±5 | 1 | 7 | 10 | Not Specified | -65 to 200 | DO-41 | Active |
| 1N4733G | Taiwan Semiconductor Corporation | 5.1 | ±5 | 1 | 7 | 10 | 1.2 | -65 to 200 | DO-204AL (DO-41) | Active |
Engineering Selection Recommendations
For Direct Replacement (Obsolete Part Mitigation):
The 1N4733A from Lumimax Optoelectronic Technology provides the most direct substitution, matching all electrical parameters and maintaining identical package designation (DO-41G). This part carries active product status and RoHS3 compliance, ensuring long-term availability and regulatory alignment.
For High-Volume Production:
The 1N4733A,113 from NXP Semiconductors offers the largest inventory availability (215,630 units) with full electrical and thermal specification match. This part is suitable for designs requiring extended production runs and supply chain stability.
For Temperature-Constrained Applications:
The 1N4733AP/TR8 from Microchip Technology operates within a reduced temperature range (-65°C to 150°C) compared to the original specification (-65°C to 200°C). This part is suitable only for applications where the upper operating temperature does not exceed 150°C.
For All Other Applications:
The 1N4733A-T50A from onsemi, 1N4733A TR PBFREE from Central Semiconductor Corp, 1N4733ATR from onsemi, and 1N4733G from Taiwan Semiconductor Corporation all meet the full electrical and mechanical specifications with active product status. These parts are interchangeable with the original 1N4733A-TP for applications operating within the -65°C to 200°C temperature range.
All substitute parts listed carry ROHS3 compliance and REACH unaffected status, maintaining regulatory compliance with the original component.
Frequently Asked Questions (FAQ)
Q: Can I use 1N4733AP/TR8 as a direct replacement for 1N4733A-TP in all applications?
A: The 1N4733AP/TR8 is electrically equivalent but operates only to 150°C maximum, compared to the original specification of 200°C. Use this part only in applications where the maximum operating temperature does not exceed 150°C.
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 through-hole axial lead component. Both refer to the same physical form factor and are mechanically interchangeable. The different designations reflect historical naming conventions from different manufacturers.
Q: Are all listed substitute parts RoHS compliant?
A: All substitute parts listed carry ROHS3 compliance status, ensuring compatibility with RoHS-regulated applications. The original 1N4733A-TP also carries ROHS3 compliance.
Q: Which substitute part has the best inventory availability?
A: The 1N4733A,113 from NXP Semiconductors maintains the highest inventory level at 215,630 units, providing superior supply chain availability for production requirements.
Q: Can I use these substitute parts in new designs, or are they only for replacement of obsolete parts?
A: All substitute parts listed carry active product status and are suitable for both new designs and replacement of the obsolete 1N4733A-TP. Active product status ensures continued manufacturer support and long-term availability.
Q: What is the significance of "TR PBFREE" in the part number 1N4733A TR PBFREE?
A: The "PBFREE" designation indicates lead-free manufacturing, confirming compliance with RoHS directives that restrict hazardous substances including lead. This part is suitable for applications requiring lead-free components.
Q: Are there any electrical performance differences between the substitute parts?
A: All substitute parts meet identical electrical specifications: 5.1 V nominal Zener voltage, ±5% tolerance, 1 W maximum power, 7 Ohms maximum impedance, and 10 µA reverse leakage current. Electrical performance is equivalent across all listed substitutes.
Q: What packaging options are available for the substitute parts?
A: Substitute parts are available in Cut Tape (CT), Tape & Reel (TR), and Bulk packaging formats. The original 1N4733A-TP packaging format is not specified in the available data. Select packaging based on your procurement and assembly requirements.
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