The TMP421, TMP422, and TMP423 are remote temperature sensor monitors with a built-in local temperature sensor. The remote temperature sensor diode-connected transistors are typically low-cost, NPN- or PNP-type transistors or diodes that are an integral part of microcontrollers, microprocessors, or FPGAs.
Remote accuracy is ±1°C for multiple IC manufacturers, with no calibration needed. The two-wire serial interface accepts SMBus write byte, read byte, send byte, and receive byte commands to configure the device.
The TMP421, TMP422, and TMP423 include series resistance cancellation, programmable non-ideality factor, wide remote temperature measurement range (up to +150°C), and diode fault detection.
The TMP421, TMP422, and TMP423 are all available in a SOT23-8 package. The TMP421C is also available in a DSBGA (WCSP) package.
| Remote Channel |
| Local Sensor Accuracy (Max) (+/- C) |
| Remote Sensor Accuracy (Max) (+/- C) |
| Remote Diode Temp Range for Listed Accuracy (C) |
| Remote Temp Resolution (Max) (bits) |
| Remote Sensor Correction |
| Temp Resolution (Max) (bits) |
| Operating Temperature Range (C) |
| Supply Voltage (Min) (V) |
| Supply Voltage (Max) (V) |
| Supply Current (Typ) (uA) |
| Interface |
| Features |
| Rating |
| Package Group |
| Package Size: mm2:W x L (PKG) |
| TMP423 | LM95234 | TMP411 | TMP421 | TMP422 | TMP451 | TMP461 | TMP468 |
|---|---|---|---|---|---|---|---|
| 3 | 4 | 1 | 1 | 2 | 1 | 1 | 8 |
| 2.5 | 2 | 2.5 | 2.5 | 2.5 | 1 | 1 | 0.35 |
| 1 | 0.875 | 1 | 1 | 1 | 1 | 0.75 | 0.75 |
| -40 to 150 | 60 to 100 | -40 to 150 | -40 to 150 | -40 to 150 | -55 to 150 | -55 to 150 | -55 to 150 |
| 12 | 13 | 12 | 12 | 12 | 12 | 12 | 13 |
| Series Resistance Cancellation n-Factor Correction | Beta Compensation TruTherm | Series Resistance Cancellation n-Factor Correction | Series Resistance Cancellation n-Factor Correction | Series Resistance Cancellation n-Factor Correction | n-Factor Correction | Offset Correction Register Series Resistance Cancellation n-Factor Correction | Offset Correction Register Series Resistance Cancellation n-Factor Correction |
| 12 | 11 | 12 | 12 | 12 | 12 | 12 | 13 |
| -40 to 125 | -40 to 140 | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 |
| 2.7 | 2.7 | 2.7 | 2.7 | 2.7 | 1.7 | 1.7 | 1.7 |
| 5.5 | 5.5 | 5.5 | 5.5 | 5.5 | 3.6 | 3.6 | 3.6 |
| 400 | 570 | 400 | 400 | 400 | 35 | 35 | 67 |
| I2C SMBus | I2C SMBus | I2C SMBus | I2C SMBus | I2C SMBus | I2C SMBus | I2C SMBus | I2C SMBus |
| Shutdown | One shot conversion control Programmable Alert Programmable conversion rate Remote diode fault detection Shutdown Thermal diode input stage filtering | Programmable Alert Shutdown | Shutdown | Shutdown | Dynamic Averaging Programmable Alert Shutdown | Programmable Alert Remote diode fault detection | One shot conversion control Programmable Alert Programmable conversion rate Remote diode fault detection |
| Catalog | Catalog | Catalog | Catalog | Catalog | Catalog | Catalog | Catalog |
| SOT-23 | WSON | SOIC VSSOP | DSBGA SOT-23 | SOT-23 | WSON | QFN | DSBGA VQFN |
| 8SOT-23: 8 mm2: 2.8 x 2.9(SOT-23) | See datasheet (WSON) | 8SOIC: 29 mm2: 6 x 4.9(SOIC) 8VSSOP: 15 mm2: 4.9 x 3(VSSOP) | See datasheet (DSBGA) 8SOT-23: 8 mm2: 2.8 x 2.9(SOT-23) | 8SOT-23: 8 mm2: 2.8 x 2.9(SOT-23) | See datasheet (WSON) | 10QFN: 4 mm2: 2 x 2(QFN) | See datasheet (DSBGA) 16VQFN: 9 mm2: 3 x 3(VQFN) |
| Order Now | Order Now | Order Now | Order Now | Order Now | Order Now | Order Now | Order Now |
| Version | Part Number | Definition |
|---|---|---|
| Automotive | TMP423-Q1 | Q100 devices qualified for high-reliability automotive applications targeting zero defects |
