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1N4747A Zener Diode 20V 1.3W DO-41 Equivalent & Substitute Parts
Part Overview
The 1N4747A is a through-hole zener diode rated for 20 V nominal zener voltage and 1.3 W maximum power dissipation in a DO-41 (DO-204AL) axial package. Manufactured by Vishay General Semiconductor - Diodes Division, this component is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Substitute options maintain the core electrical specifications while offering improved availability and, in many cases, enhanced performance characteristics.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Zener (Nominal) | 20 | V |
| Tolerance | ±5% | — |
| Power - Maximum | 1.3 | W |
| Impedance (Maximum) | 750 | Ohms |
| Current - Reverse Leakage @ 15.2 V | 5 | µA |
| Voltage - Forward (Maximum) @ 200 mA | 1.2 | V |
| 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 1N4747A is determined by the following critical parameters:
Electrical Compatibility Requirements:
- Zener voltage: 20 V nominal
- Tolerance: ±5% or tighter
- Forward voltage: 1.2 V maximum @ 200 mA
- Reverse leakage current: 5 µA or lower @ 15.2 V
- Power rating: 1.3 W or higher
Mechanical Compatibility Requirements:
- Package type: DO-204AL (DO-41) axial through-hole
- Mounting: Through-hole configuration
Compliance Requirements:
- RoHS3 compliance preferred for new designs
- REACH compliance status documented
Substitute parts are grouped into two categories:
Category 1: Direct Equivalent (Vishay 1N4747A-TR) Identical electrical specifications with improved availability. Active product status with enhanced impedance characteristics.
Category 2: Enhanced Performance Substitutes (Microchip 1N5932 Series and Microsemi 1N5932DG) Higher power ratings (1.5 W or 1.25 W), improved impedance characteristics, and active product status. Available in multiple tolerance grades (±1%, ±2%, ±20%) and packaging configurations. These parts exceed the minimum electrical requirements of the 1N4747A while maintaining full mechanical and functional compatibility.
Parameter Comparison
| Part Number | Manufacturer | Vz (Nom) | Tolerance | Power (Max) | Zzt (Max) | Ir @ 15.2V | Vf (Max) @ 200mA | Temp Range | Product Status | RoHS |
|---|---|---|---|---|---|---|---|---|---|---|
| 1N4747A-T | Vishay | 20 V | ±5% | 1.3 W | 750 Ω | 5 µA | 1.2 V | –/175°C | Obsolete | ROHS3 |
| 1N4747A-TR | Vishay | 20 V | ±5% | 1.3 W | 22 Ω | 5 µA | 1.2 V | –/175°C | Active | ROHS3 |
| 1N5932BPE3/TR8 | Microchip | 20 V | ±5% | 1.5 W | 14 Ω | 1 µA | 1.2 V | –65/150°C | Active | ROHS3 |
| 1N5932CE3/TR13 | Microchip | 20 V | ±2% | 1.5 W | 14 Ω | 1 µA | 1.2 V | –65/150°C | Active | ROHS3 |
| 1N5932CP/TR12 | Microchip | 20 V | ±2% | 1.5 W | 14 Ω | 1 µA | 1.2 V | –65/150°C | Active | Non-compliant |
| 1N5932CP/TR8 | Microchip | 20 V | ±2% | 1.5 W | 14 Ω | 1 µA | 1.2 V | –65/150°C | Active | Non-compliant |
| 1N5932CPE3/TR12 | Microchip | 20 V | ±2% | 1.5 W | 14 Ω | 1 µA | 1.2 V | –65/150°C | Active | ROHS3 |
| 1N5932CPE3/TR8 | Microchip | 20 V | ±2% | 1.5 W | 14 Ω | 1 µA | 1.2 V | –65/150°C | Active | ROHS3 |
| 1N5932DG | Microsemi | 20 V | ±1% | 1.25 W | 14 Ω | 1 µA | 1.2 V | –65/175°C | Active | Non-compliant |
| 1N5932P/TR12 | Microchip | 20 V | ±20% | 1.5 W | 14 Ω | 1 µA | 1.2 V | –65/150°C | Active | Non-compliant |
| 1N5932P/TR8 | Microchip | 20 V | ±20% | 1.5 W | 14 Ω | 1 µA | 1.2 V | –65/150°C | Active | Non-compliant |
Engineering Selection Recommendations
Primary Recommendation: 1N4747A-TR
The 1N4747A-TR from Vishay is the direct equivalent replacement for the obsolete 1N4747A-T. This part maintains identical electrical specifications (20 V, ±5% tolerance, 1.3 W power rating) and mechanical compatibility (DO-41 package). The 1N4747A-TR is active in production, ROHS3 compliant, and offers significantly improved impedance characteristics (22 Ω versus 750 Ω). This part is suitable for direct substitution in existing designs without circuit modifications.
Secondary Recommendations: Microchip 1N5932 Series
The Microchip 1N5932 series provides enhanced performance alternatives with higher power ratings (1.5 W) and superior impedance characteristics (14 Ω). These parts are active in production and offer multiple tolerance grades:
- 1N5932BPE3/TR8: ±5% tolerance, ROHS3 compliant. Closest tolerance match to the original 1N4747A.
- 1N5932CPE3/TR8 and 1N5932CPE3/TR12: ±2% tolerance, ROHS3 compliant. Improved voltage regulation accuracy.
- 1N5932CE3/TR13: ±2% tolerance, ROHS3 compliant. Alternative packaging configuration.
Parts designated with "CP" or "P" suffix without "E3" designation are RoHS non-compliant and should be avoided for new designs requiring regulatory compliance.
Tertiary Recommendation: Microsemi 1N5932DG
The 1N5932DG from Microsemi offers the tightest tolerance (±1%) and extended operating temperature range (–65°C to 175°C, matching the original part's upper limit). Power rating is 1.25 W, which exceeds the 1.3 W requirement of the original. This part is suitable for applications requiring superior voltage regulation accuracy. RoHS compliance status is non-compliant.
Compliance Considerations:
For new designs and applications requiring RoHS3 compliance, select from: 1N4747A-TR, 1N5932BPE3/TR8, 1N5932CE3/TR13, 1N5932CPE3/TR8, or 1N5932CPE3/TR12.
For applications with no RoHS compliance requirement, all listed substitutes are electrically compatible.
Frequently Asked Questions (FAQ)
Q: Can the 1N5932 series parts directly replace the 1N4747A?
A: Yes. The 1N5932 series maintains the same 20 V zener voltage, forward voltage characteristics, and DO-41 package configuration. The higher power ratings (1.5 W versus 1.3 W) and improved impedance characteristics (14 Ω versus 750 Ω) represent performance enhancements rather than incompatibilities. No circuit modifications are required.
Q: What is the difference between 1N5932BPE3/TR8 and 1N5932CPE3/TR8?
A: Both parts are manufactured by Microchip Technology and share identical electrical specifications (20 V, 1.5 W, 14 Ω impedance). The primary difference is tolerance: 1N5932BPE3/TR8 has ±5% tolerance, while 1N5932CPE3/TR8 has ±2% tolerance. The "E3" designation indicates RoHS3 compliance for both parts. Selection depends on voltage regulation accuracy requirements.
Q: Why does the 1N4747A-TR have lower impedance (22 Ω) than the original 1N4747A-T (750 Ω)?
A: Impedance values reflect manufacturing improvements and process refinements. Lower impedance indicates better voltage regulation characteristics and reduced dynamic resistance. This is a performance improvement that does not affect functional compatibility.
Q: Are there packaging differences between the substitute parts?
A: All substitute parts use the DO-204AL (DO-41) axial through-hole package, ensuring mechanical compatibility. Packaging variations relate to tape and reel configurations (TR8, TR12, TR13) for automated assembly. These designations indicate different reel quantities and do not affect electrical performance or physical dimensions.
Q: Which substitute part should I select for automotive applications?
A: The original 1N4747A carries automotive grade designation with AEC-Q101 qualification. The 1N4747A-TR maintains this automotive qualification. The Microchip 1N5932 series and Microsemi 1N5932DG do not carry explicit automotive grade designation in the provided specifications. For applications requiring automotive qualification, the 1N4747A-TR is the appropriate selection.
Q: What is the significance of the "P" versus "PE3" designation in Microchip part numbers?
A: The "PE3" designation indicates RoHS3 compliance. Parts designated with "P" alone are RoHS non-compliant. For new designs subject to RoHS regulations, select parts with "PE3" or "E3" designations.
Q: Can I use 1N5932P/TR12 or 1N5932P/TR8 as substitutes?
A: These parts are electrically compatible with the 1N4747A. However, they carry ±20% tolerance (versus ±5% for the original) and are RoHS non-compliant. Use these parts only in applications where loose voltage tolerance and non-compliance with RoHS regulations are acceptable.
Q: What is the operating temperature difference between the 1N4747A and the 1N5932 series?
A: The 1N4747A operates to 175°C maximum. The Microchip 1N5932 series operates from –65°C to 150°C, providing a lower upper temperature limit. The Microsemi 1N5932DG extends to 175°C, matching the original. For applications requiring operation at temperatures above 150°C, select either the 1N4747A-TR or 1N5932DG.
Q: Is the 1N5932DG suitable for RoHS-compliant designs?
A: The 1N5932DG is RoHS non-compliant according to the provided specifications. For RoHS3-compliant designs, select from the Microchip 1N5932 series parts with "E3" designation or the Vishay 1N4747A-TR.
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