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SMAJ5931B-TP Equivalent & Substitute Parts
Part Overview
The SMAJ5931B-TP is an active-status zener diode manufactured by Micro Commercial Co, rated for 18 V nominal zener voltage with 1.5 W maximum power dissipation in a surface mount DO-214AC (SMA) package. This component is designed for voltage regulation and transient protection applications in electronic circuits. Substitute parts are identified when equivalent electrical specifications, mechanical compatibility, and compliance certifications align with the original component, enabling direct replacement in circuit designs without performance degradation.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Zener (Nom) | 18 | V |
| Tolerance | ±5 | % |
| Power - Max | 1.5 | W |
| Impedance (Max) | 12 | Ohms |
| Current - Reverse Leakage @ Vr | 500 nA @ 13.7 V | nA |
| Voltage - Forward (Vf) (Max) @ If | 1.5 V @ 200 mA | V |
| Operating Temperature | 150 | °C |
| Package / Case | DO-214AC, SMA | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of zener diodes is determined by strict equivalence across electrical and mechanical parameters. The SMAJ5931B-TP qualifies for direct substitution with parts that meet all of the following criteria:
- Zener voltage (Vz) of 18 V nominal with ±5% tolerance
- Maximum power rating of 1.5 W
- Maximum impedance (Zzt) of 12 Ohms
- Reverse leakage current of 500 nA @ 13.7 V
- Forward voltage (Vf) of 1.5 V maximum @ 200 mA
- Surface mount package in DO-214AC (SMA) form factor
- RoHS3 compliance and MSL 1 rating
The substitute part 1SMA5931BT3G, manufactured by onsemi, satisfies all electrical and mechanical parameters specified for the SMAJ5931B-TP. Packaging format differences (Tape & Reel versus Cut Tape & Digi-Reel) do not affect electrical compatibility and represent alternative supply chain options.
Parameter Comparison
| Parameter | SMAJ5931B-TP (Micro Commercial Co) | 1SMA5931BT3G (onsemi) | Match |
|---|---|---|---|
| Voltage - Zener (Nom) | 18 V | 18 V | Yes |
| Tolerance | ±5% | ±5% | Yes |
| Power - Max | 1.5 W | 1.5 W | Yes |
| Impedance (Max) | 12 Ohms | 12 Ohms | Yes |
| Current - Reverse Leakage @ Vr | 500 nA @ 13.7 V | 500 nA @ 13.7 V | Yes |
| Voltage - Forward (Vf) (Max) @ If | 1.5 V @ 200 mA | 1.5 V @ 200 mA | Yes |
| Operating Temperature (Max) | 150°C | 150°C | Yes |
| Package / Case | DO-214AC, SMA | DO-214AC, SMA | Yes |
| Mounting Type | Surface Mount | Surface Mount | Yes |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | Yes |
| Moisture Sensitivity Level | 1 (Unlimited) | 1 (Unlimited) | Yes |
Engineering Selection Recommendations
The 1SMA5931BT3G manufactured by onsemi is a direct electrical and mechanical equivalent to the SMAJ5931B-TP. Both components are active-status products with identical electrical specifications, package form factors, and compliance certifications (RoHS3, REACH Unaffected, EAR99 ECCN classification). Selection between these parts is based on supply chain availability, packaging format preference (Tape & Reel versus Cut Tape & Digi-Reel), and inventory requirements rather than technical performance differences. Both components are suitable for applications requiring 18 V zener regulation with 1.5 W power dissipation in surface mount configurations.
Frequently Asked Questions (FAQ)
Q: Can the 1SMA5931BT3G replace the SMAJ5931B-TP in existing circuit designs?
A: Yes. The 1SMA5931BT3G is electrically and mechanically equivalent across all specified parameters, including zener voltage, power rating, impedance, leakage current, forward voltage, operating temperature range, and package form factor. Direct substitution is supported without circuit modification.
Q: What is the difference between Tape & Reel and Cut Tape & Digi-Reel packaging?
A: Tape & Reel and Cut Tape & Digi-Reel represent different supply and handling formats for surface mount components. Tape & Reel provides continuous reel packaging for automated assembly lines. Cut Tape & Digi-Reel offers smaller quantity packaging options. Both formats contain identical components with no electrical or mechanical differences.
Q: Are both parts RoHS3 compliant?
A: Yes. Both the SMAJ5931B-TP and 1SMA5931BT3G are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, indicating equivalent environmental and regulatory compliance.
Q: What parameters must match for zener diode substitution?
A: Zener voltage (Vz), tolerance, maximum power rating, impedance, reverse leakage current, forward voltage characteristics, operating temperature range, and package form factor must all match. The SMAJ5931B-TP and 1SMA5931BT3G satisfy all these requirements.
Q: Is operating temperature range a limiting factor for substitution?
A: The SMAJ5931B-TP specifies a maximum operating temperature of 150°C. The 1SMA5931BT3G specifies an operating range of −65°C to 150°C. Both components support the same maximum temperature, ensuring thermal compatibility in all applications within the specified range.
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