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The purpose of the 555 article is to alert you to the advantages and disadvantages of the 555 and its derivatives.
In many cases, a 555 circuit can be replaced by a building block using a gate from a Hex Schmitt Trigger, such as the 74c14. This chip is equal to six 555’s and costs about us40¢.
The following table identifies some of the 555 and 7555 markings and associated manufacturers.
Take care to determine if the IC is a standard TTL version or a CMOS device.
| Manufacturer | Type Number |
|---|---|
| Exar | XR-L555 |
| Fairchild | NE555 |
| Harris | HA555 |
| Harris | ICM7555IPA |
| Intersil | SE555/NE555 |
| Lithic Systems | LC555 |
| Maxim | ICM7555 |
| Motorola | MC1455/MC1555 |
| National | LM1455/LM555C |
| NTE Sylvania | NTE955M |
| Philips | ICM7555C |
| Raytheon | RM555/RC555 |
| RCA | CA555/CA555C |
| Texas Instruments | SN52555/SN72555 |
The following table gives approximate prices for 555 and 7555 IC’s:
| Chip | Price |
|---|---|
| NE555 | us36¢ Au$1 50p |
| NE556 | Au$1.75 50p |
| NE555D (surface mount) | us28¢ |
| TLC555 (CMOS) | $1.49 Radio Shack |
| TS555CN (CMOS) | us40¢ |
| LM555CN (not CMOS) | us35¢ |
| TS3V555ID (3v timer) | us40¢ |
| 7555 | Au$3.15 |
| ICM7555 | us60¢ |
| ICM7556 | us$1.10 |
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