# LTC2451ITS8#TRMPBF

**Analog Devices** · Analog To Digital Converters (ADC) · TSOT-23-8

LTC2451ITS8#TRMPBF from Analog Devices, in a TSOT-23-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | GND | power_in | Ground; connect to a ground plane through a low impedance connection. |
| 2 | REF- | input | Differential reference negative input, which may be any value between GND and VCC as long as REF+ stays at least 2.5V more positive than REF-; the differential reference voltage (REF+ to REF-) sets the full-scale range. |
| 3 | REF+ | input | Differential reference positive input, which may be any value between GND and VCC and must remain at least 2.5V more positive than REF-; the differential reference voltage (REF+ to REF-) sets the full-scale range. |
| 4 | VCC | power_in | Positive supply voltage of 2.7V to 5.5V; bypass to GND (pin 1) with a 10µF capacitor in parallel with a low series inductance 0.1µF capacitor placed as close to the part as possible. |
| 5 | GND | power_in | Ground; connect to a ground plane through a low impedance connection. |
| 6 | IN | input | Analog input with a single-ended input range of VREF- to VREF+. |
| 7 | SCL | input | Serial clock input of the I2C interface; the LTC2451 acts only as a slave, data is shifted in on SCL rising edges and output on SCL falling edges. |
| 8 | SDA | bidirectional | Bidirectional I2C serial data line that is high impedance unless the part is in data output mode, when it becomes an open-drain pull-down requiring an external 1.7k pull-up resistor to VCC. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices |
| Package | TSOT-23-8 |
| Category | Data Acquisition |
| Pins | 8 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply Voltage | VCC | 2.7 |  | 5.5 | V |  | 3 |
| Supply Current Conversion | ICC |  | 400 | 700 | µA |  | 3 |
| Supply Current Sleep | ICC |  | 0.2 | 0.5 | µA |  | 3 |
| Operating Temperature Range (LTC2451I) | TA | -40 |  | 85 | °C |  | 2 |
| Storage Temperature Range | TSTG | -65 |  | 150 | °C |  | 2 |
| Supply Voltage (absolute maximum) | VCC | -0.3 |  | 6 | V |  | 2 |
| Maximum Junction Temperature | TJMAX |  |  | 125 | °C | C/I grade | 2 |
| Thermal Resistance Junction-to-Ambient | θJA |  | 140 |  | °C/W | TS8 (TSOT-23) package, C/I grade | 2 |
| Resolution (No Missing Codes) |  | 16 |  |  | Bits |  | 2 |
| Integral Nonlinearity | INL |  | 2 | 10 | LSB |  | 2 |
| Offset Error 30Hz Mode | VOS |  | 0.08 | 0.5 | mV | 30Hz Mode | 2 |
| Offset Error 60Hz Mode | VOS |  | 0.5 | 2 | mV | 60Hz Mode | 2 |
| Gain Error |  |  | 0.01 | 0.02 | % of FS |  | 2 |
| Power Supply Rejection DC 30Hz Mode |  | 80 |  |  | dB |  | 2 |
| Power Supply Rejection DC 60Hz Mode |  | 80 |  |  | dB |  | 2 |
| Conversion Time 30Hz Mode | tCONV | 26 | 33.2 | 46 | ms | 30Hz Mode | 3 |
| Conversion Time 60Hz Mode | tCONV | 13 | 16.6 | 23 | ms | 60Hz Mode | 3 |
| SCL Clock Frequency | fSCL | 0 |  | 400 | kHz |  | 3 |
| Hold Time (Repeated) START Condition | tHD(SDA) | 0.6 |  |  | µs |  | 3 |
| LOW Period of the SCL Pin | tLOW | 1.3 |  |  | µs |  | 3 |
| HIGH Period of the SCL Pin | tHIGH | 0.6 |  |  | µs |  | 3 |
| Set-Up Time for a Repeated START Condition | tSU(STA) | 0.6 |  |  | µs |  | 3 |
| Data Hold Time | tHD(DAT) | 0 |  | 0.9 | µs |  | 3 |
| Data Set-Up Time | tSU(DAT) | 100 |  |  | ns |  | 3 |
| Rise Time for SDA/SCL Signals | tr |  |  | 300 | ns |  | 3 |
| Fall Time for SDA/SCL Signals | tf |  |  | 300 | ns |  | 3 |
| Set-Up Time for STOP Condition | tSU(STO) | 0.6 |  |  | µs |  | 3 |
| Bus Free Time Between a STOP and START Condition | tBUF | 1.3 |  |  | µs |  | 3 |
| High Level Output Voltage Low (SDA) | VOL |  |  | 0.4 | V | I = 3mA | 3 |
| Input Leakage | IIN | -1 |  | 1 | µA | 0.1VCC ≤ VIN ≤ 0.9VCC | 3 |
| Capacitance for Each I/O Pin | CI |  |  | 10 | pF |  | 3 |
| Capacitance Load for Each Bus Line | CB |  |  | 400 | pF |  | 3 |
| IN DC Leakage Current | IDC_LEAK(VIN) | -10 | 1 | 10 | nA | VIN = GND (Note 8) | 3 |
| REF+, REF- DC Leakage Current | IDC_LEAK(REF+, REF-) | -10 | 1 | 10 | nA | VREF = 5V (Note 8) | 3 |
| Output Fall Time | tOF |  |  | 250 | ns | VIH(MIN) to VIL(MAX), bus load CB 10pF to 400pF (Note 6) | 4 |
| Input Spike Suppression | tSP |  |  | 50 | ns |  | 4 |

## CAD (KiCad official)

- Symbol: `LTC2451ITS8#TRMPBF`
- Footprint: `Package_TO_SOT_SMD:TSOT-23-8`
- 3D model: TSOT-23-8 (KiCad packages3D, STEP)
- 3D model files: `ltc2451its8-trmpbf-etched.step` / `ltc2451its8-trmpbf-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ltc2451its8-trmpbf.step` / `ltc2451its8-trmpbf.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Analog Devices datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588885954878300160) (20 pp, sha256 `5e3eba71951e62a0`, retrieved 2026-10-18, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/ltc2451its8-trmpbf-datasheet.pdf)