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2M51Z Zener Diode Equivalent & Substitute Parts
Part Overview
The 2M51Z is an active-status Zener diode manufactured by Taiwan Semiconductor Corporation, rated for 51 V nominal Zener voltage with 2 W maximum power dissipation. The device is packaged in DO-204AC (DO-15) axial through-hole configuration and operates across the temperature range of -55°C to 175°C. This component is ROHS3 compliant and REACH unaffected, with unlimited moisture sensitivity rating (MSL 1).
Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, application requirements, or design optimization needs.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Zener (Nom) | 51 | V |
| Tolerance | ±5% | % |
| Power - Max | 2 | W |
| Impedance (Max) | 48 | Ohms |
| Current - Reverse Leakage @ Vr | 500 nA @ 38.8 V | nA |
| Operating Temperature Range | -55 to 175 | °C |
| Mounting Type | Through Hole | — |
| Package / Case | DO-204AC, DO-15, Axial | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitution of the 2M51Z is permissible with the 1N5369B-TP based on the following critical parameters:
Matching Electrical Characteristics:
- Zener voltage (Nom): 51 V (identical)
- Tolerance: ±5% (identical)
- Reverse leakage current: 500 nA @ 38.8 V (identical)
- Package / Case: DO-15 axial through-hole (compatible)
Allowable Differences:
- Power rating: 1N5369B-TP rated at 5 W (exceeds 2M51Z requirement of 2 W)
- Impedance: 1N5369B-TP at 27 Ohms (lower than 2M51Z at 48 Ohms)
- Operating temperature upper limit: 1N5369B-TP at 150°C (lower than 2M51Z at 175°C)
The 1N5369B-TP provides equivalent or superior electrical performance in the critical Zener voltage and tolerance specifications. The higher power rating and lower impedance of the substitute represent performance enhancements. The reduced upper operating temperature limit of the substitute must be evaluated against application requirements.
Parameter Comparison
| Parameter | 2M51Z | 1N5369B-TP | Unit |
|---|---|---|---|
| Manufacturer | Taiwan Semiconductor Corporation | Micro Commercial Co | — |
| Voltage - Zener (Nom) | 51 | 51 | V |
| Tolerance | ±5% | ±5% | % |
| Power - Max | 2 | 5 | W |
| Impedance (Max) | 48 | 27 | Ohms |
| Current - Reverse Leakage @ Vr | 500 nA @ 38.8 V | 500 nA @ 38.8 V | nA |
| Operating Temperature Range | -55 to 175 | -55 to 150 | °C |
| Mounting Type | Through Hole | Through Hole | — |
| Package / Case | DO-204AC, DO-15, Axial | DO-15, Axial | — |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | — |
| REACH Status | REACH Unaffected | REACH Unaffected | — |
| Moisture Sensitivity Level | 1 (Unlimited) | 1 (Unlimited) | — |
Engineering Selection Recommendations
2M51Z Selection Criteria:
- Applications requiring operation at temperatures above 150°C
- Designs where the 2 W power rating is the specified maximum
- Circuits where impedance specification of 48 Ohms is a design constraint
1N5369B-TP Selection Criteria:
- Applications operating within -55°C to 150°C temperature range
- Designs benefiting from higher power dissipation capability (5 W)
- Circuits where lower impedance (27 Ohms) improves performance
- Inventory availability and supply chain considerations
Both parts maintain ROHS3 compliance and REACH unaffected status. Both are rated for unlimited moisture sensitivity (MSL 1). Electrical substitution is valid when the application temperature range does not exceed 150°C and the higher power rating and lower impedance of the 1N5369B-TP do not create circuit design conflicts.
Frequently Asked Questions (FAQ)
Q: Can the 1N5369B-TP directly replace the 2M51Z in all applications?
A: Direct replacement is valid when the application operating temperature does not exceed 150°C. The 2M51Z supports operation to 175°C; the 1N5369B-TP does not. Verify application temperature requirements before substitution.
Q: What is the significance of the impedance difference between these parts?
A: The 2M51Z has maximum impedance of 48 Ohms; the 1N5369B-TP has maximum impedance of 27 Ohms. Lower impedance typically results in better voltage regulation and faster transient response. This difference must be evaluated against circuit design specifications.
Q: Are both parts mechanically compatible?
A: Both parts use DO-15 axial through-hole packaging. Physical dimensions and lead spacing are compatible for board-level substitution.
Q: Do both parts meet regulatory requirements?
A: Both parts are ROHS3 compliant, REACH unaffected, and rated MSL 1 (unlimited moisture sensitivity). Regulatory compliance is equivalent.
Q: Why does the 1N5369B-TP have a higher power rating?
A: The 1N5369B-TP is rated for 5 W maximum power dissipation compared to the 2M51Z at 2 W. This represents a design enhancement and does not prevent substitution in applications requiring 2 W or less.
Q: What is the reverse leakage current specification?
A: Both parts specify 500 nA reverse leakage current measured at 38.8 V. This parameter is identical and indicates equivalent leakage performance.
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