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SM24B-TP Equivalent & Substitute Parts
Part Overview
The SM24B-TP is a bidirectional Transient Voltage Suppressor (TVS) diode manufactured by Micro Commercial Co, designed for general-purpose transient protection applications. This surface-mount component operates with a 24V reverse standoff voltage and provides 50V clamping at peak pulse current. The part is currently in active production status with RoHS3 compliance and unlimited moisture sensitivity rating.
Substitute parts are identified when equivalent electrical performance can be maintained within the allowed parameter ranges for this TVS diode category, ensuring functional interchangeability in circuit protection applications.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 24V | Max |
| Voltage - Breakdown (Min) | 27V | V |
| Voltage - Clamping (Max) @ Ipp | 50V | V |
| Current - Peak Pulse (8/20µs) | 4A | A |
| Power - Peak Pulse | 300W | W |
| Bidirectional Channels | 2 | — |
| Package / Case | SOT-23-3 (TO-236) | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitute parts for the SM24B-TP are qualified based on the following electrical and mechanical criteria:
- Reverse standoff voltage within 24V specification (Min/Max tolerance range)
- Clamping voltage at or below 50V maximum
- Peak pulse current capability of 3A or greater (8/20µs waveform)
- Bidirectional channel configuration (1 or 2 channels acceptable)
- Surface-mount SOT-23-3 (TO-236) package compatibility
- RoHS3 compliance and unlimited MSL rating
- Active product status
The identified substitutes maintain functional equivalence for transient voltage suppression while operating within the electrical envelope defined by these parameters.
Parameter Comparison
| Parameter | SM24B-TP (Main) | NUP1105LT1G | NUP2115LT1G |
|---|---|---|---|
| Manufacturer | Micro Commercial Co | onsemi | onsemi |
| Voltage - Reverse Standoff (Typ) | 24V (Max) | 24V (Min) | 24V (Min) |
| Voltage - Breakdown (Min) | 27V | 25.7V | 26.2V |
| Voltage - Clamping (Max) @ Ipp | 50V | 44V | 50V |
| Current - Peak Pulse (8/20µs) | 4A | 8A | 3A |
| Power - Peak Pulse | 300W | 350W | 200W |
| Bidirectional Channels | 2 | 1 | 2 |
| Capacitance @ 1MHz | 20pF | 60pF | 10pF |
| Package / Case | SOT-23-3 (TO-236) | SOT-23-3 (TO-236) | SOT-23-3 (TO-236) |
| Operating Temperature | — | -55°C ~ 150°C (TJ) | -55°C ~ 150°C (TJ) |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| MSL Rating | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
| Product Status | Active | Active | Active |
Engineering Selection Recommendations
Both substitute parts maintain active production status and full RoHS3 compliance with unlimited moisture sensitivity ratings, matching the regulatory and supply-chain requirements of the SM24B-TP.
NUP2115LT1G provides the closest electrical match, maintaining identical 50V clamping voltage and 2-channel bidirectional configuration. This part carries AEC-Q101 automotive qualification, extending its applicability to automotive-grade applications. Peak pulse current is rated at 3A, which is lower than the main part's 4A specification but remains within acceptable substitution parameters for general-purpose transient protection.
NUP1105LT1G offers higher peak pulse current capability (8A) and lower clamping voltage (44V), making it suitable for applications requiring enhanced transient suppression performance. However, this part features a single-channel configuration rather than bidirectional channels, which may affect circuit compatibility depending on application requirements. Operating temperature range is specified at -55°C to 150°C.
Frequently Asked Questions (FAQ)
Q: Can NUP1105LT1G replace SM24B-TP in all applications?
A: NUP1105LT1G is electrically compatible for transient suppression but has a single-channel configuration versus the SM24B-TP's dual-channel design. Circuit topology must be evaluated to confirm single-channel operation is acceptable for the intended application.
Q: What is the primary difference between NUP2115LT1G and NUP1105LT1G?
A: NUP2115LT1G maintains 2-channel bidirectional configuration and 50V clamping matching the SM24B-TP, with 3A peak pulse current. NUP1105LT1G provides 1-channel configuration, 44V clamping, and 8A peak pulse current. Selection depends on circuit requirements for channel count and clamping voltage.
Q: Are all substitute parts in the same package?
A: Yes. SM24B-TP, NUP1105LT1G, and NUP2115LT1G all use SOT-23-3 (TO-236) surface-mount packaging, ensuring mechanical and footprint compatibility on PCB assemblies.
Q: Do substitute parts meet the same compliance standards?
A: All parts are RoHS3 compliant with unlimited MSL ratings. NUP2115LT1G additionally carries AEC-Q101 automotive qualification, extending its use to automotive applications where such certification is required.
Q: What capacitance differences exist between these parts?
A: SM24B-TP has 20pF capacitance at 1MHz. NUP1105LT1G is rated at 60pF, and NUP2115LT1G at 10pF. Capacitance variations may affect high-frequency circuit behavior and should be evaluated for timing-sensitive applications.
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