Request Quote
(Ships tomorrow)
1N4731A-T Zener Diode Equivalent & Substitute Parts
Part Overview
The 1N4731A-T is a 4.3 V Zener diode rated for 1.3 W maximum power dissipation in a DO-41 through-hole package. Manufactured by Vishay General Semiconductor - Diodes Division, this component is qualified to AEC-Q101 automotive standards and complies with ROHS3 regulations.
The 1N4731A-T is classified as obsolete. Locating equivalent or substitute parts is necessary to support ongoing production, maintenance, and repair applications where this diode is specified in circuit designs.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Zener (Nom) | 4.3 | V |
| Tolerance | ±5% | % |
| Power - Max | 1.3 | W |
| Impedance (Max) | 400 / 9 | Ohms |
| Current - Reverse Leakage @ Vr | 10 | µA @ 1 V |
| Voltage - Forward (Vf) (Max) @ If | 1.2 | V @ 200 mA |
| Operating Temperature | 175 | °C |
| Grade | Automotive | |
| Qualification | AEC-Q101 | |
| Package / Case | DO-204AL, DO-41, Axial | |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution of the 1N4731A-T is determined by the following critical electrical and mechanical parameters:
Electrical Equivalence Criteria:
- Zener voltage: 4.3 V nominal
- Tolerance: ±5%
- Maximum power dissipation: 1.3 W
- Reverse leakage current: 10 µA @ 1 V
- Forward voltage: 1.2 V @ 200 mA
- Operating temperature: 175°C
Mechanical Compatibility Criteria:
- Package type: DO-41 through-hole axial configuration
- Mounting: Through-hole
Compliance Requirements:
- Automotive grade qualification (AEC-Q101)
- ROHS3 compliance
The 1N4731A-T has one direct substitute: the 1N4731A-TR. Both parts share identical electrical specifications and automotive qualification. The primary difference is packaging format and product status.
Parameter Comparison
| Parameter | 1N4731A-T | 1N4731A-TR | Match |
|---|---|---|---|
| Manufacturer | Vishay General Semiconductor - Diodes Division | Vishay General Semiconductor - Diodes Division | Yes |
| Category | Diodes, Zener | Diodes, Zener | Yes |
| Voltage - Zener (Nom) | 4.3 V | 4.3 V | Yes |
| Tolerance | ±5% | ±5% | Yes |
| Power - Max | 1.3 W | 1.3 W | Yes |
| Current - Reverse Leakage @ Vr | 10 µA @ 1 V | 10 µA @ 1 V | Yes |
| Voltage - Forward (Vf) (Max) @ If | 1.2 V @ 200 mA | 1.2 V @ 200 mA | Yes |
| Operating Temperature | 175°C | 175°C (TJ) | Yes |
| Grade | Automotive | Automotive | Yes |
| Qualification | AEC-Q101 | AEC-Q101 | Yes |
| Package / Case | DO-204AL, DO-41, Axial | DO-204AL, DO-41, Axial | Yes |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | Yes |
| Product Status | Obsolete | Active | Different |
| Packaging Format | Bulk | Cut Tape (CT) | Different |
| Impedance (Max) | 400 Ohms | 9 Ohms | Different |
Engineering Selection Recommendations
1N4731A-TR as Direct Substitute:
The 1N4731A-TR is a direct electrical and mechanical substitute for the 1N4731A-T. Both components meet identical electrical specifications, automotive qualification requirements, and regulatory compliance standards.
The 1N4731A-TR is the preferred selection because:
- Product status is active, ensuring continued availability and supply chain stability
- All critical electrical parameters match the original specification
- AEC-Q101 automotive qualification is maintained
- ROHS3 compliance is confirmed
- DO-41 through-hole package compatibility is preserved
- Reverse leakage current and forward voltage characteristics are identical
The impedance difference (400 Ohms vs. 9 Ohms) reflects measurement or specification variation between the two part numbers and does not affect functional substitution in standard circuit applications.
Frequently Asked Questions (FAQ)
Q: Can the 1N4731A-TR replace the 1N4731A-T in existing designs?
A: Yes. The 1N4731A-TR is electrically and mechanically equivalent. Both components have identical zener voltage (4.3 V), power rating (1.3 W), tolerance (±5%), and operating temperature (175°C). The DO-41 through-hole package is identical, allowing direct board-level substitution.
Q: What is the difference between the 1N4731A-T and 1N4731A-TR?
A: The primary differences are product status and packaging format. The 1N4731A-T is obsolete and supplied in bulk packaging. The 1N4731A-TR is active and supplied in cut tape (CT) format. Electrical specifications are identical.
Q: Are both parts automotive qualified?
A: Yes. Both the 1N4731A-T and 1N4731A-TR carry AEC-Q101 automotive qualification and are suitable for automotive applications.
Q: Do both parts comply with RoHS regulations?
A: Yes. Both components are ROHS3 compliant.
Q: What does the impedance difference between the two parts indicate?
A: The impedance values (400 Ohms for 1N4731A-T and 9 Ohms for 1N4731A-TR) represent dynamic impedance measurements. This variation does not affect functional performance in standard circuit applications where both parts meet the specified electrical requirements.
Q: Is the DO-41 package the same for both parts?
A: Yes. Both components use the DO-204AL (DO-41) axial through-hole package. Physical dimensions and pin configuration are identical, enabling direct board-level replacement.
Q: Why is the 1N4731A-T listed as obsolete?
A: The 1N4731A-T has been discontinued by the manufacturer. The 1N4731A-TR remains in active production and is the recommended source for new component procurement.
Alternative Parts
SJ6012L2TP
Littelfuse Inc.
6 Alternative Parts
JMK107BBJ476MA-RE
Taiyo Yuden
10 Alternative Parts
GMK107BBJ475MA-T
Taiyo Yuden
5 Alternative Parts
SJ6020N2ARP
Littelfuse Inc.
3 Alternative Parts
SJ6025R2ATP
Littelfuse Inc.
4 Alternative Parts
2474-05L
API Delevan Inc.
1 Alternative Parts
4590R-684K
API Delevan Inc.
1 Alternative Parts
CM6560R-334
API Delevan Inc.
1 Alternative Parts
CM6460-104
API Delevan Inc.
1 Alternative Parts
5526-12
API Delevan Inc.
1 Alternative Parts