When part numbers look similar, the ending suffix typically indicates packaging specifications. However, there are cases where the suffix actually denotes an entirely different series of parts. TPSMC24CA is not actually the same series as TPSMC24CA-VR in this instance. These are two different parts according to the datasheet and part specifications.
Similarities
I would actually consider these parts as good cross-references for each other for the most part. Here is a table showing the similarities:
| Parameter Name | Value |
|---|---|
| Type | Zener |
| Bidirectional Channels | 1 |
| Power Peak Pulse | 1500W |
| Power Line Protection | No |
| Grade | Automotive |
| Qualification | AEC-Q101 |
| Mounting Type | Surface Mount |
| Package/Case | DO-214AB, SMC |
Differences
Here are the differences. The first value is pertaining to the part without “VR.”
| Parameter Name | 1st Value | 2nd Value |
|---|---|---|
| Voltage Reverse Standoff | 20.5V | 24V |
| Voltage Breakdown (Min) | 22.8V | 26.7V |
| Voltage Clamping (Max) | 33.2V | 38.9V |
| Current Peak Pulse | 45.8A | 38.6A |
| Applications | - | General Purpose |
| Operating Temperature | -55C to 150C (TJ) | -65C-150C (TJ) |
Personally, the “VR” part is an upgrade compared to the original considering the voltages. It is always a good idea to compare parts to see if they are actually different or if they are just the same part with different shipping packages. The markings on these parts will not be the same either.