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MM5Z18VT5G Equivalent & Substitute Parts
Part Overview
The MM5Z18VT5G is an 18 V Zener diode rated for 500 mW power dissipation in a surface mount SOD-523 package. Manufactured by onsemi, this component is classified as Active and complies with RoHS3 and REACH standards. Zener diodes of this specification are used in voltage regulation, overvoltage protection, and reference circuits. Substitute parts may be required due to inventory constraints, lead time considerations, or specific packaging and qualification requirements for particular applications.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Zener (Nom) | 18 | V |
| Tolerance | ±6.39 | % |
| Power - Max | 500 | mW |
| Impedance (Max) | 45 | Ohms |
| Current - Reverse Leakage @ Vr | 50 | nA @ 12.6 V |
| Voltage - Forward (Vf) (Max) @ If | 900 | mV @ 10 mA |
| Operating Temperature Range | -65 to 150 | °C (TJ) |
| Package / Case | SC-79, SOD-523 | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the MM5Z18VT5G is determined by electrical and mechanical parameter equivalence. The critical parameters that define substitutability are:
- Voltage - Zener (Nom): 18 V
- Power - Max: 500 mW
- Impedance (Max): 45 Ohms
- Current - Reverse Leakage @ Vr: 50 nA @ 12.6 V
- Voltage - Forward (Vf) (Max) @ If: 900 mV @ 10 mA
- Operating Temperature Range: -65°C to 150°C
- Package / Case: SOD-523
- Mounting Type: Surface Mount
- RoHS Status: ROHS3 Compliant
The SZMM5Z18VT5G meets all electrical specifications and mechanical requirements identical to the MM5Z18VT5G. Both components share the same base electrical characteristics, package footprint, and compliance certifications. The substitute part is qualified to AEC-Q101 automotive standards, providing additional qualification coverage for applications requiring automotive-grade components.
Parameter Comparison
| Parameter | MM5Z18VT5G | SZMM5Z18VT5G | Match |
|---|---|---|---|
| Manufacturer | onsemi | onsemi | Yes |
| Category | Diodes, Zener | Diodes, Zener | Yes |
| Voltage - Zener (Nom) | 18 V | 18 V | Yes |
| Tolerance | ±6.39% | ±6.39% | Yes |
| Power - Max | 500 mW | 500 mW | Yes |
| Impedance (Max) | 45 Ohms | 45 Ohms | Yes |
| Current - Reverse Leakage @ Vr | 50 nA @ 12.6 V | 50 nA @ 12.6 V | Yes |
| Voltage - Forward (Vf) (Max) @ If | 900 mV @ 10 mA | 900 mV @ 10 mA | Yes |
| Operating Temperature | -65°C ~ 150°C (TJ) | -65°C ~ 150°C (TJ) | Yes |
| Package / Case | SC-79, SOD-523 | SC-79, SOD-523 | Yes |
| Mounting Type | Surface Mount | Surface Mount | Yes |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | Yes |
| Moisture Sensitivity Level | 1 (Unlimited) | 1 (Unlimited) | Yes |
| REACH Status | REACH Unaffected | REACH Unaffected | Yes |
| Product Status | Active | Active | Yes |
Engineering Selection Recommendations
Both the MM5Z18VT5G and SZMM5Z18VT5G are Active products manufactured by onsemi with identical electrical and mechanical specifications. Selection between these parts is based on application requirements and supply chain considerations:
MM5Z18VT5G is suitable for general-purpose applications requiring an 18 V Zener diode with 500 mW power rating in SOD-523 packaging. The component meets RoHS3 and REACH compliance requirements.
SZMM5Z18VT5G provides the same electrical and mechanical performance with additional AEC-Q101 automotive qualification. This variant is specified for applications requiring automotive-grade component certification or when automotive supply chain qualification is mandated.
Both parts are interchangeable from an electrical and mechanical standpoint. The choice between them depends on whether automotive qualification is required for the end application. Packaging format differences (standard tape versus Digi-Reel) do not affect electrical performance or PCB assembly compatibility.
Frequently Asked Questions (FAQ)
Q: Are MM5Z18VT5G and SZMM5Z18VT5G electrically identical?
A: Yes. Both components have identical Zener voltage (18 V), power rating (500 mW), impedance (45 Ohms), reverse leakage current (50 nA @ 12.6 V), forward voltage (900 mV @ 10 mA), and operating temperature range (-65°C to 150°C).
Q: Can SZMM5Z18VT5G replace MM5Z18VT5G in existing designs?
A: Yes. The SZMM5Z18VT5G is a direct substitute. Both components use the same SOD-523 package footprint and have identical electrical characteristics. No circuit modifications are required.
Q: What is the difference between MM5Z18VT5G and SZMM5Z18VT5G?
A: The primary difference is qualification level. SZMM5Z18VT5G carries AEC-Q101 automotive qualification, making it suitable for automotive applications. Electrical and mechanical specifications are identical.
Q: Does packaging format affect compatibility?
A: No. Packaging format differences (Cut Tape versus Digi-Reel) relate to supply and handling only. Both formats contain the same component with identical SOD-523 package geometry and electrical performance.
Q: Are both parts RoHS3 compliant?
A: Yes. Both MM5Z18VT5G and SZMM5Z18VT5G are ROHS3 Compliant and REACH Unaffected.
Q: Which part should be selected for automotive applications?
A: SZMM5Z18VT5G is specified for automotive applications due to AEC-Q101 qualification. If automotive qualification is not required, either part is acceptable based on availability and supply chain requirements.
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