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MMSZ4689 Equivalent & Substitute Parts
Part Overview
The MMSZ4689 is a Zener diode rated at 5.1 V nominal with 500 mW power dissipation in SOD-123 surface mount packaging. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design requirements and production continuity. Equivalent parts maintain identical electrical specifications and mechanical compatibility, while substitute parts offer functional equivalence with potential variations in secondary parameters such as impedance or reverse leakage characteristics.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Zener (Nom) | 5.1 | V |
| Tolerance | ±5% | % |
| Power - Max | 500 | mW |
| Voltage - Forward (Vf) (Max) @ If | 900 mV @ 10 mA | mV @ mA |
| Operating Temperature Range | -55 to 150 | °C |
| Mounting Type | Surface Mount | — |
| Package / Case | SOD-123 | — |
| Current - Reverse Leakage @ Vr | 10 µA @ 3 V | µA @ V |
Substitute Part Grouping Explanation
Substitution of the MMSZ4689 is determined by the following critical parameters:
Primary Substitution Criteria:
- Zener voltage: 5.1 V nominal
- Power rating: 500 mW maximum
- Package type: SOD-123 surface mount
- Operating temperature range: -55°C to 150°C
- Forward voltage: 900 mV maximum at 10 mA
Secondary Variation Parameters:
- Current - Reverse Leakage @ Vr (ranges from 2 µA to 10 µA depending on part variant)
- Impedance (Zzt) (ranges from 17 Ohms to 60 Ohms depending on part variant)
- Packaging format (Cut Tape & Digi-Reel® versus Tape & Reel)
- Product grade (standard industrial versus automotive AEC-Q101)
Parts are grouped into three categories: direct equivalents (identical base part number with different packaging or tape formats), functional equivalents (alternative base part numbers with identical core electrical specifications), and automotive-qualified variants (AEC-Q101 certified for automotive applications).
Parameter Comparison
| Part Number | Manufacturer | Status | Vz (V) | Tolerance | Power (mW) | Vf @ If (mV @ mA) | Ir @ Vr (µA @ V) | Zzt (Ohms) | Packaging | Grade |
|---|---|---|---|---|---|---|---|---|---|---|
| MMSZ4689 | onsemi | Obsolete | 5.1 | ±5% | 500 | 900 @ 10 | 10 @ 3 | — | CT & Digi-Reel® | Industrial |
| MMSZ4689ET1G | onsemi | Active | 5.1 | ±5% | 500 | 900 @ 10 | 10 @ 3 | — | TR | Industrial |
| MMSZ4689T1G | onsemi | Active | 5.1 | ±5% | 500 | 900 @ 10 | 10 @ 3 | — | CT & Digi-Reel® | Industrial |
| MMSZ4689T3G | onsemi | Active | 5.1 | ±5% | 500 | 900 @ 10 | 10 @ 3 | — | TR | Industrial |
| MMSZ5231BT1G | onsemi | Active | 5.1 | ±5% | 500 | 900 @ 10 | 5 @ 2 | 17 | CT & Digi-Reel® | Industrial |
| MMSZ5231BT3G | onsemi | Active | 5.1 | ±5% | 500 | 900 @ 10 | 5 @ 2 | 17 | TR | Industrial |
| MMSZ5V1T1G | onsemi | Active | 5.1 | ±5% | 500 | 900 @ 10 | 2 @ 2 | 60 | CT & Digi-Reel® | Industrial |
| SZMMSZ4689ET1G | onsemi | Active | 5.1 | ±5% | 500 | 900 @ 10 | 10 @ 3 | — | TR | Automotive |
| SZMMSZ4689T1G | onsemi | Active | 5.1 | ±5% | 500 | 900 @ 10 | 10 @ 3 | — | CT & Digi-Reel® | Automotive |
| SZMMSZ5231BT1G | onsemi | Active | 5.1 | ±5% | 500 | 900 @ 10 | 5 @ 2 | 17 | CT & Digi-Reel® | Automotive |
| SZMMSZ5V1T1G | onsemi | Active | 5.1 | ±5% | 500 | 900 @ 10 | 2 @ 2 | 60 | TR | Automotive |
Engineering Selection Recommendations
Direct Equivalents (Identical Base Part Number):
MMSZ4689T1G and MMSZ4689T3G are direct equivalents of the obsolete MMSZ4689. Both maintain identical electrical specifications and differ only in packaging format. MMSZ4689T1G is supplied in Cut Tape & Digi-Reel® format, matching the original packaging. MMSZ4689T3G is supplied in Tape & Reel format. Both parts are active and RoHS3 compliant.
Functional Equivalents (Alternative Base Part Numbers):
MMSZ5231BT1G, MMSZ5231BT3G, MMSZ5V1T1G, and SZMMSZ5V1T1G maintain the core electrical specifications (5.1 V, 500 mW, SOD-123) but exhibit variations in secondary parameters. MMSZ5231BT1G and MMSZ5231BT3G feature lower reverse leakage current (5 µA @ 2 V versus 10 µA @ 3 V) and defined impedance (17 Ohms). MMSZ5V1T1G features the lowest reverse leakage (2 µA @ 2 V) with higher impedance (60 Ohms). These variations do not affect primary zener regulation function in standard applications.
Automotive-Qualified Variants:
SZMMSZ4689ET1G, SZMMSZ4689T1G, SZMMSZ5231BT1G, and SZMMSZ5V1T1G are AEC-Q101 qualified automotive-grade equivalents. These parts are suitable for applications requiring automotive qualification and maintain identical electrical performance to their industrial-grade counterparts. Selection of automotive variants is required only when AEC-Q101 certification is specified.
Packaging Considerations:
Cut Tape & Digi-Reel® packaging (CT) is suitable for manual handling and small-volume assembly. Tape & Reel (TR) packaging is optimized for automated pick-and-place equipment. Selection between these formats depends on assembly process requirements, not electrical performance.
Frequently Asked Questions (FAQ)
Q: Can MMSZ4689T1G be used as a direct replacement for the obsolete MMSZ4689?
A: Yes. MMSZ4689T1G is a direct equivalent with identical electrical specifications and packaging format. Both are rated at 5.1 V, 500 mW, SOD-123, with ±5% tolerance and -55°C to 150°C operating range.
Q: What is the difference between MMSZ5231BT1G and MMSZ5V1T1G?
A: Both maintain the core 5.1 V, 500 mW specifications. MMSZ5231BT1G has reverse leakage of 5 µA @ 2 V with 17 Ohms impedance. MMSZ5V1T1G has reverse leakage of 2 µA @ 2 V with 60 Ohms impedance. Selection depends on circuit requirements for leakage current and dynamic impedance.
Q: Are automotive-grade parts (SZMMSZ prefix) interchangeable with industrial-grade parts?
A: Automotive-grade parts are electrically and mechanically interchangeable with industrial-grade equivalents. Automotive variants are AEC-Q101 qualified and required only when automotive certification is specified. Industrial-grade parts are suitable for non-automotive applications.
Q: Does packaging format (CT vs. TR) affect electrical performance?
A: No. Packaging format affects only handling and assembly process compatibility. Electrical specifications are identical between Cut Tape & Digi-Reel® and Tape & Reel formats of the same part number.
Q: Can MMSZ4689 be substituted with MMSZ5231BT1G in all applications?
A: MMSZ5231BT1G is electrically compatible for zener regulation function. The primary difference is lower reverse leakage current (5 µA @ 2 V versus 10 µA @ 3 V) and defined impedance (17 Ohms). These variations are beneficial in most applications and do not create incompatibility.
Q: What is the inventory status of substitute parts?
A: MMSZ4689T1G has 125,300 units in stock. MMSZ5231BT1G has 365,300 units in stock. SZMMSZ5231BT1G has 785,200 units in stock. All listed active parts are available for immediate procurement.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All active substitute parts listed are RoHS3 compliant. The obsolete MMSZ4689 does not carry RoHS3 compliance designation.
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