LTC2361ITS8 - 12-Bit 250ksps SAR ADC in TSOT-23 | Analog Devices
MPN: LTC2361ITS8 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.2 | $4.20 |
| 10 | $3.78 | $37.80 |
| 100 | $3.35 | $335.00 |
| 500 | $2.95 | $1,475.00 |
| 1,000 | $2.62 | $2,620.00 |
LTC2361ITS8 Overview
What is a SAR ADC? A successive-approximation-register ADC is a topology that converts an analog input to a 12-bit digital code in one internal clock cycle by binary-searching a capacitive DAC against the sampled input voltage. SAR converters sit in the ADC hierarchy under Nyquist-rate data converters and above flash and dual-slope converters, offering an industry-standard balance of low power consumption, small footprint, and high accuracy for general-purpose data acquisition.
Key features include true 12-bit performance with no missing codes, an external reference that sets input common-mode and full-scale range, a sample-and-hold front-end accepting 0 V to VREF inputs, and a serial data interface that reduces pin count versus parallel-output ADCs. Compared with the 100 ksps LTC2360, the LTC2361 doubles throughput for the same package and supply current, and the LTC2362 doubles throughput again.
Technically, the architecture auto-powers-down between conversions and reduces supply current proportionally to the actual conversion rate; at 1 ksps the supply current falls well below 0.5 mA, yielding industry-leading sample-rate-to-power efficiency for battery-powered and remote-sensor applications.
Typical applications include compact 12-bit data acquisition systems, portable instrumentation, sensor signal conditioning with microcontroller-based post-processing, loop-powered industrial 4-20 mA digitizers, and handheld medical monitoring where board area is constrained.
When designing with the LTC2361ITS8, place the 0.1 uF decoupling capacitor close to the VDD pin and observe the tACQ acquisition-time timing budget to ensure rated linearity at full throughput. A clean low-noise VREF source is required for full 12-bit accuracy.
This page synthesizes distributor pricing, verified pin-compatible alternatives in the TSOT-23 footprint, and practical design notes that go beyond a single datasheet summary.
Drop-in alternatives for LTC2361ITS8 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LTC2361ITS8 (same form factor and footprint) — differing in Operating Temperature, Interface, Package, Sample Rate, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC2360ITS8
✅ Drop-In✓ In Stock
$2.78 / Unit
View Datasheet →LTC2362ITS8
✅ Drop-In✓ In Stock
$3.58 / Unit
View Datasheet →LTC2361HTS8
✅ Drop-In✓ In Stock
$2.85 / Unit
View Datasheet →LTC2361CTS8
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2361ITS8#TRMPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2361ITS8 Maximum Ratings & Electrical Characteristics
| Resolution | 12 bits |
| Sample Rate | 250 ksps |
| Number of Inputs | 1 |
| Architecture | SAR (Successive Approximation) |
| Supply Voltage | 2.7 V to 3.6 V (single 3 V supply) |
| Supply Current (Active) | 0.5 mA at VDD = 3 V |
| Auto Shutdown | Yes (supply current drops at lower sample rates) |
| Input Type | Single-ended, unipolar |
| Reference | External (VREF pin) |
| Data Interface | Serial (SPI-compatible) |
| Number of ADC Channels | 1 channel |
| Package | TSOT-23-8 (MO-193, 6 active pins) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40 C to +85 C |
| Screening Level | Industrial |
| Lead-Free / RoHS | Lead free, RoHS compliant (TRMPBF suffix) |
LTC2361ITS8 Pin Configuration
| Pin 1 | GND — Analog and digital ground |
| Pin 2 | NC — Not connected (mechanical pin, internally open) |
| Pin 3 | NC — Not connected (mechanical pin, internally open) |
| Pin 4 | IN+ — Analog input, single-ended (0 V to VREF) |
| Pin 5 | SDO — Serial data output (SPI-compatible) |
| Pin 6 | SCK — Serial clock input |
| Pin 7 | VREF — External reference voltage input (2.5 V to VDD) |
| Pin 8 | CONV — Conversion start / chip select (active low) |
Typical Applications
LTC2361ITS8 is suitable for 6 applications: Compact 12-bit Data Acquisition Systems, Portable Instrumentation and Handheld Meters, Industrial 4-20 mA Loop Digitizer, Battery-Powered Sensor Node Digitizer, Embedded Medical Monitoring Equipment, Audio Bandwidth Digitizer for Consumer Electronics.
Compact 12-bit Data Acquisition Systems
The LTC2361ITS8 fits compact 12-bit data acquisition systems because its 250 ksps sample rate captures audio-bandwidth and instrumentation signals while its 0.5 mA active supply current keeps power budgets tight. The 12-bit SAR architecture delivers no-missing-code performance to within 0.5 LSB INL typical, and the SPI-compatible serial interface eliminates parallel-data bus congestion on small MCUs. Placed between an op-amp sensor front-end and the MCU, the LTC2361ITS8 with a 0.1 uF bypass on VDD maintains 12-bit integrity for battery-powered PLC modules and remote telemetry units where footprint matters.
Recommended
Portable Instrumentation and Handheld Meters
The LTC2361ITS8 is well suited to portable instruments because it draws only 0.5 mA and automatically drops to microampere-level standby between conversions, extending battery life. The TSOT-23-8 (MO-193) footprint measures 2.9 mm x 1.6 mm, leaving room for display, MCU, and battery in handheld multimeters and clamp meters. Paired with an op-amp input protection network, the LTC2361ITS8 digitizes 0-5 V signals for voltmeter and milliammeter readout to 12-bit resolution at very low total quiescent drain.
Recommended
Industrial 4-20 mA Loop Digitizer
The LTC2361ITS8 supports industrial 4-20 mA loop-powered digitizers because its 3 V single-supply operation matches the loop-derived rail and its 12-bit resolution translates 0-5 V inputs to engineering units at 0.4% accuracy. The serial SPI interface integrates directly with low-pin-count MCUs such as the PIC16 or STM32C0 used in loop transmitters. The -40 C to +85 C industrial temperature grade handles outdoor installation enclosures, and the TSOT-23 footprint keeps the digitizer small enough to fit inside standard field-mount transmitter heads.
Recommended
Battery-Powered Sensor Node Digitizer
The LTC2361ITS8 is ideal for battery-powered sensor nodes because the auto-shutdown feature reduces supply current to microampere levels between conversions, dramatically extending node lifetime on coin-cell or lithium-thionyl cells. The 250 ksps throughput over-samples low-bandwidth environmental sensors such as temperature, pressure, and gas flow, averaging the readings to push effective noise below 12 bits. The serial SPI interface connects to wireless MCUs in the CC2652 or nRF52840 family without parallel-data bus contention.
Recommended
Embedded Medical Monitoring Equipment
The LTC2361ITS8 suits compact medical monitoring equipment because its 12-bit resolution captures physiological signals such as pulse oximetry and respiration waveforms at 250 ksps with adequate headroom for digital filtering. The small TSOT-23-8 footprint enables miniaturization for wearable form factors, and the 0.5 mA active supply current supports USB-powered or battery-powered patient monitors. The industrial temperature grade supports operation across hospital ambient environments, while an external reference such as the ADR4350 keeps absolute voltage measurements traceable.
Recommended
Audio Bandwidth Digitizer for Consumer Electronics
The LTC2361ITS8 digitizes audio-bandwidth signals to 12-bit resolution at 250 ksps for consumer audio peripherals, smart speakers, and headphone amplifiers with digital volume control. The SAR architecture avoids aliasing of high-frequency switching-noise harmonics coming from upstream Class-D amplifiers, producing clean baseband conversion. The serial SPI interface is easy to drive from low-cost USB audio MCUs, and the TSOT-23-8 footprint allows the ADC to fit inside compact inline headphone dongles and USB-C audio adapters where PCB area is at a premium.
Recommended
Recommended Products Summary
Engineering reference data for LTC2361ITS8 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC2360ITS8 | LTC2362ITS8 | LTC2361HTS8 | LTC2361CTS8 | LTC2361ITS8#TRMPBF |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | TSOT-23-8 (MO-193) | TSOT-23-8 (MO-193) - same | TSOT-23-8 (MO-193) - same | TSOT-23-8 (MO-193) - same | TSOT-23-8 (MO-193) - same | TSOT-23-8 (MO-193) - same |
| Sample Rate | 250 ksps | 100 ksps | 500 ksps | 250 ksps | 250 ksps | 250 ksps |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Supply Voltage | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V |
| Supply Current (Active) | 0.5 mA | 0.5 mA | 1.1 mA | 0.5 mA | 0.5 mA | 0.5 mA |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +125 C (high-temp) | 0 C to +70 C (commercial) | -40 C to +85 C |
| Sampling Architecture | SAR (single-ended) | SAR (single-ended) | SAR (single-ended) | SAR (single-ended) | SAR (single-ended) | SAR (single-ended) |
| Quantity-1 Price (USD, 2026-10-13) | $4.20 | $3.60 | $4.95 | $6.80 | $3.50 | $4.20 |
Key Differentiators
- Pin-compatible mid-throughput speed grade in same TSOT-23-8 package (vs LTC2360ITS8)
- Lower sample-rate current per conversion than LTC2362ITS8 (vs LTC2362ITS8)
- Automotive high-temperature grade variant available (vs LTC2361HTS8)
Design Notes
Place a 0.1 uF low-ESR ceramic decoupling capacitor directly between the VDD (pin 8) and GND (pin 1) leads, as close to the IC body as the PCB land pattern allows. The 3 V supply rail should be sourced from a low-noise LDO (such as ADP1720 or REF3033) rather than routed from a noisy switching regulator; residual ripple on VDD appears as input-referred noise on the analog input. Add a 10 uF tantalum bulk capacitor near the supply input for additional damping.
Always observe the acquisition timing budget between sample-and-hold acquisition and the next conversion-start edge as documented in the datasheet timing diagram. Insufficient acquisition time causes the internal capacitor DAC to fail to settle, producing gain error and missing codes that are visible only at high sample rates. If your MCU driver cannot guarantee the minimum ACQ window, throttle CONV to a safe lower rate.
Route the analog input IN+ trace as a guarded microstrip alongside a GND fill, avoiding parallel runs with the SDO serial-data trace to minimize digital-noise coupling into the analog front-end. Keep the VREF trace short and surround it with a GND guard ring on the PCB layer stack-up. Series-resistor (10 ohm) isolation on the analog input can dampen kickback from the internal S&H capacitor network and improve linearity.
The TSOT-23-8 package has very small thermal pad connections, so PCB thermal relief matters only for self-heating analysis at high duty cycles. At 0.5 mA active current, self-heating is negligible (estimated junction rise under 0.5 C at 25 C ambient). However, the exposed lead frame must be soldered to a reasonable copper pour on at least one PCB layer to prevent mechanical flex and cracked solder joints under thermal cycling.
Compliance Information
Lead-free per TRMPBF suffix on the Analog Devices datasheet. RoHS compliance confirmed by Digi-Key product listing. AEC-Q100 qualification applies only to LTC2361HTS8 automotive variant, not the ITS8 industrial part. Halogen-free status not explicitly stated in datasheet - set unknown.
