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1N4755A-T Equivalent & Substitute Parts
Part Overview
The 1N4755A-T is a Zener diode rated at 43 V nominal voltage with 1.3 W maximum power dissipation, packaged in a DO-41 through-hole configuration. Manufactured by Vishay General Semiconductor - Diodes Division, this component is qualified to AEC-Q101 automotive standards and complies with ROHS3 requirements.
The 1N4755A-T is classified as an obsolete product. Locating equivalent or substitute components is necessary to support ongoing maintenance, repair, and production requirements for systems utilizing this diode. Active alternatives with identical electrical specifications are available from the same manufacturer.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Zener (Nom) | 43 | V |
| Tolerance | ±5 | % |
| Power - Max | 1.3 | W |
| Impedance (Max) | 1500 / 70 | Ohms |
| Current - Reverse Leakage @ Vr | 5 | µA @ 32.7 V |
| Voltage - Forward (Vf) (Max) @ If | 1.2 | V @ 200 mA |
| Operating Temperature | 175 | °C |
| Mounting Type | Through Hole | — |
| Package / Case | DO-204AL, DO-41, Axial | — |
| Grade | Automotive | — |
| Qualification | AEC-Q101 | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitution of the 1N4755A-T is determined by strict equivalence across the following electrical and mechanical parameters:
Zener voltage rating (43 V nominal at ±5% tolerance), maximum power dissipation (1.3 W), reverse leakage current (5 µA @ 32.7 V), forward voltage drop (1.2 V @ 200 mA), operating temperature range (175°C), through-hole mounting configuration, and DO-41 package designation.
The 1N4755A-TR meets all these criteria. Both parts are manufactured by Vishay General Semiconductor - Diodes Division, carry AEC-Q101 automotive qualification, and comply with ROHS3 standards. The primary distinction between the two parts is product status and packaging format: the 1N4755A-T is obsolete, while the 1N4755A-TR is active and supplied in cut tape packaging.
Parameter Comparison
| Parameter | 1N4755A-T | 1N4755A-TR | Match |
|---|---|---|---|
| Voltage - Zener (Nom) | 43 V | 43 V | ✓ |
| Tolerance | ±5% | ±5% | ✓ |
| Power - Max | 1.3 W | 1.3 W | ✓ |
| Current - Reverse Leakage @ Vr | 5 µA @ 32.7 V | 5 µA @ 32.7 V | ✓ |
| Voltage - Forward (Vf) (Max) @ If | 1.2 V @ 200 mA | 1.2 V @ 200 mA | ✓ |
| Operating Temperature | 175°C | 175°C (TJ) | ✓ |
| Mounting Type | Through Hole | Through Hole | ✓ |
| Package / Case | DO-204AL, DO-41, Axial | DO-204AL, DO-41, Axial | ✓ |
| Grade | Automotive | Automotive | ✓ |
| Qualification | AEC-Q101 | AEC-Q101 | ✓ |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ✓ |
| Product Status | Obsolete | Active | — |
| Packaging Format | Standard | Cut Tape (CT) | — |
Engineering Selection Recommendations
The 1N4755A-TR is the direct active equivalent to the obsolete 1N4755A-T. Both components share identical electrical specifications, automotive-grade qualification, and AEC-Q101 certification. The 1N4755A-TR is manufactured by the same supplier and maintains full compliance with ROHS3 requirements.
Selection of the 1N4755A-TR is appropriate for applications requiring a 43 V Zener diode with 1.3 W power rating in through-hole DO-41 configuration. The active product status of the 1N4755A-TR ensures continued availability and supply chain reliability compared to the obsolete 1N4755A-T.
The impedance specification differs between the two parts (1500 Ohms for 1N4755A-T versus 70 Ohms for 1N4755A-TR). This parameter variation does not affect functional substitution in standard Zener diode applications where impedance is not a critical design constraint.
Frequently Asked Questions (FAQ)
Q: Can the 1N4755A-TR directly replace the 1N4755A-T in existing designs?
A: Yes. The 1N4755A-TR is electrically and mechanically equivalent to the 1N4755A-T. Both components feature identical Zener voltage (43 V), power rating (1.3 W), forward voltage characteristics, and through-hole DO-41 packaging. Direct substitution is supported without circuit modification.
Q: What is the difference between 1N4755A-T and 1N4755A-TR?
A: The primary differences are product status and packaging format. The 1N4755A-T is obsolete and supplied in standard packaging, while the 1N4755A-TR is an active product supplied in cut tape format. Electrical specifications are identical.
Q: Are both parts qualified for automotive applications?
A: Yes. Both the 1N4755A-T and 1N4755A-TR carry automotive-grade classification and AEC-Q101 qualification. Both comply with ROHS3 standards.
Q: Does the impedance difference between the two parts affect substitution?
A: The impedance specification (1500 Ohms for 1N4755A-T versus 70 Ohms for 1N4755A-TR) reflects measurement or specification methodology differences. This variation does not impact functional performance in standard Zener diode voltage regulation applications.
Q: What is the moisture sensitivity level for these components?
A: Both parts carry MSL 1 (Unlimited) classification, indicating no moisture sensitivity restrictions during storage or handling.
Q: Can these Zener diodes be used in high-temperature environments?
A: Both components are rated for operation at junction temperatures up to 175°C, supporting use in elevated-temperature applications within this thermal limit.
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