ADC081S101CIMF - 8-Bit 1Msps SAR ADC, SOT-23-6 | Texas Instruments
MPN: ADC081S101CIMF ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.55 | $15.50 |
| 100 | $1.18 | $118.00 |
| 500 | $0.92 | $460.00 |
| 1,000 | $0.74 | $740.00 |
ADC081S101CIMF Overview
An SAR (Successive-Approximation Register) ADC is a type of analog-to-digital converter that converts an input voltage to a digital code by binary-searching against a precision DAC. Compared with sigma-delta and pipeline ADCs, SAR ADCs deliver deterministic latency (one conversion per start-of-conversion pulse), low power consumption, and excellent DC linearity, while saturating around 1-10 Msps in modern CMOS processes. SAR is the dominant topology for low-power, sample-on-demand applications such as sensor readouts, motor control feedback loops, and instrumentation front-ends.
Key features of the ADC081S101 include 8-bit resolution with no missing codes, an analog input range of 0 V to VDD, a hardware power-down pin that drops quiescent current to a few microamps between bursts, and an industry-standard 6-pin SOT-23 footprint that lets designers shrink the analog front-end to a few square millimeters of board area. According to the TI datasheet, the ADC081S101 shares its pinout and serial protocol with the 10-bit ADC101S101 and 12-bit ADC121S101, allowing seamless scaling of resolution without changing firmware or layout.
Typical applications include industrial process control loops, portable battery-powered instrumentation, optical module monitoring, white-goods sensor readouts, and consumer-electronics front-ends. Designers choose this family when they need deterministic SAR latency, sub-3 mW typical operating power, and an ultra-small footprint that fits beside a sensor or inside a sealed housing.
When designing with the ADC081S101CIMF, place the bypass capacitor within a few millimeters of the VDD pin and route the analog input over a quiet ground-referenced trace to avoid digital switching noise coupling into the sample window. The SOT-23-6 package is small but tracks well on standard reflow profiles. Industrial temperature grade (-40C to +85C) makes the part suitable for outdoor and automotive cabin applications, though not AEC-Q100 qualified.
This page synthesizes distributor pricing, drop-in alternatives drawn from the same TI pin-compatible family, and practical design guidance that complements the manufacturer datasheet.
Drop-in alternatives for ADC081S101CIMF — 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 ADC081S101CIMF (same form factor and footprint) — differing in Package, Resolution.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADC081S101CIMF/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
ADC081S101CISDX/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
ADC101S101CIMF/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
ADC121S101CIMF/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
ADC081S021CIMFX/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
ADC081S051CISDX/NOPB
✅ Drop-In✓ In Stock
$1.62 / Unit
View Datasheet →ADC081S101CIMF Maximum Ratings & Electrical Characteristics
| Resolution | 8 bits |
| Sample Rate Range | 500 ksps to 1 Msps |
| Number of Channels | 1 |
| Architecture | SAR (Successive Approximation Register) |
| Input Type | Single-ended |
| Analog Input Voltage Range | 0 V to VDD |
| Supply Voltage (VDD) | +2.7 V to +5.25 V |
| Supply Current at 3V | approximately 0.67 mA typical at 1 Msps |
| Supply Current at 5V | approximately 2.0 mA typical at 1 Msps |
| Power Dissipation (3V/5V) | 2.0 mW / 10.0 mW normal |
| Power-down Current | approximately 2.5 µW at +5V |
| Serial Interface | SPI / QSPI / MICROWIRE / DSP-compatible |
| Digital Output Format | Straight binary |
| Track-and-Hold | Internal |
| Operating Temperature Range | -40C to +85C (Industrial) |
| Package | 6-pin SOT-23 (DBV) |
| MSL Level | MSL1 according to JEDEC J-STD-020 |
ADC081S101CIMF Pin Configuration
| Pin 1 | CS — Chip Select input (active low). Pulled low enables the serial interface. |
| Pin 2 | SCLK — Serial Clock input. Drives the conversion and shifts data on DOUT. |
| Pin 3 | DOUT — Serial Data Output. Outputs the conversion result, MSB first, synchronous to SCLK. |
| Pin 4 | VIN — Analog Input. Single-ended voltage input, range 0 V to VDD. |
| Pin 5 | GND — Ground return for analog and digital sections. |
| Pin 6 | VDD — Power supply input, +2.7 V to +5.25 V. Bypass with a 1 µF ceramic capacitor close to the pin. |
Typical Applications
ADC081S101CIMF is suitable for 7 applications: Industrial Process Control Sensor Readout, Portable Battery-Powered Instrumentation, Optical Module Monitoring, White-Goods and Appliance Sensor Front-End, Consumer Electronics Sensor Readout, Industrial Temperature and Process Logging, Low-Cost Motor and Solenoid Feedback.
Industrial Process Control Sensor Readout
Sampling analog sensors (pressure transducers, 4-20 mA loops, temperature bridges) on factory-floor PLCs and distributed IO modules. The ADC081S101CIMF fits this application because its 8-bit resolution and 1 Msps SAR conversion keep latency under 1 microsecond while maintaining SPI/QSPI-compatible serial output that any industrial microcontroller or DSP can read. Power dissipation stays under 10 mW at 5V, leaving thermal headroom in sealed IP65-rated enclosures. The SOT-23-6 package sits beside the sensor head without crowding the layout, and the industrial temperature range of -40C to +85C handles outdoor and cabinet-mounted environments common to process control. Pin-to-pin compatibility with the 10-bit ADC101S101 also enables easy resolution upgrades without PCB rework when more margin is needed.
Recommended
Portable Battery-Powered Instrumentation
Digitizing analog signals in handheld multimeters, portable data loggers, and field instrumentation. The ADC081S101CIMF fits this application because its 2.0 mW typical power draw at 3V and 2.5 microW power-down current extend battery life across weeks of intermittent sampling. The SAR architecture offers deterministic conversion time, allowing the host MCU to sleep until the sample completes. The 6-pin SOT-23-6 package occupies a few square millimeters of PCB space, leaving room for battery holders, display drivers, and wireless modules in compact enclosures. Sample rates up to 1 Msps are useful for transient capture in field service tools, while the same SPI bus allows multiple sensors to be polled by chip select.
Recommended
Optical Module Monitoring
Reading SFP/QSFP optical module bias currents, transmit power, and temperature inside networking line cards and switches. The ADC081S101CIMF fits this application because its 1 Msps sampling rate captures fast photodiode transients while the small SOT-23-6 package fits directly inside the module's analog front-end section. SPI compatibility enables the module's MCU to poll multiple ADCs over a shared serial bus, and the wide 2.7V to 5.25V supply accommodates common 3.3V and 5V module rails. Industrial temperature grade makes the part suitable for telecom closet and outdoor cabinet environments. The ADC081S101 family shares a pinout and protocol with 10- and 12-bit siblings (ADC101S101/ADC121S101), letting designers keep a single PCB layout across multiple module variants.
Recommended
White-Goods and Appliance Sensor Front-End
Sampling sensors in washing machines, refrigerators, ovens, and HVAC indoor units where cost, size, and reliability matter most. The ADC081S101CIMF fits this application because its 8-bit resolution is sufficient for thermistors, water level sensors, and motor current monitoring, and the SOT-23-6 footprint lets designers squeeze the analog section next to the sensor. SPI/QSPI compatibility with standard appliance controllers (often low-cost Cortex-M0 or 8051 MCUs) eliminates extra glue logic, and the industrial temperature range of -40C to +85C covers oven interiors, refrigerators, and humid bathroom environments. The active NOPB variant is the recommended part for ongoing appliance production where lead-free compliance is mandatory.
Recommended
Consumer Electronics Sensor Readout
Sampling analog signals in toys, fitness wearables, gaming peripherals, and audio accessories. The ADC081S101CIMF fits this application because its SOT-23-6 footprint is compact enough to sit next to a coin-cell battery or small sensor, and 8-bit resolution is sufficient for joystick analogs, capacitive touch-to-ADC pads, and simple audio level meters. SPI compatibility lets the device talk to standard low-cost MCUs without an analog buffer chain, and the 2.7V minimum supply rides nicely on a single Li-ion cell. Power-down current in the microamp range extends battery life in always-off products. Designers wanting higher accuracy can drop in the pin-compatible 12-bit ADC121S101 on the same PCB.
Recommended
Industrial Temperature and Process Logging
Multiplexed low-speed logging of temperature, pressure, or strain-gauge channels in remote sensor nodes and data-acquisition boards. The ADC081S101CIMF fits this application because the SAR architecture has no pipeline delay, so engineers get accurate single-shot reads for slow-changing signals, and the 1 Msps top end can be applied to fast multiplexed scans across multiple sensors via chip select. The SOT-23-6 footprint lets designers place the ADC right at the multiplexer output to minimize analog trace length. Industrial-grade temperature range and the wide 2.7V to 5.25V supply allow deployment on 3.3V or 5V industrial backplanes without level shifters. The same-footprint pin compatibility with the 10-bit ADC101S101 is a future-proofing benefit for higher-accuracy rev spins.
Recommended
Low-Cost Motor and Solenoid Feedback
Reading DC motor current, position-sensor outputs, or solenoid drive voltages in cost-sensitive industrial motion-control designs. The ADC081S101CIMF fits this application because the SAR architecture offers the deterministic latency needed for closed-loop current and position control without pipeline delays, and the 1 Msps sample rate is fast enough to detect current spikes during PWM switching edges. The SOT-23-6 package fits between the MOSFETs and the MCU on the same PCB, and the SPI output works cleanly with either the main controller or a dedicated motor-control DSP. Designers can stay on a single PCB layout and swap to the 10-bit ADC101S101 if extra accuracy is needed.
Recommended
Recommended Products Summary
Engineering reference data for ADC081S101CIMF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADC081S101CIMF/NOPB | ADC101S101CIMF/NOPB | ADC121S101CIMF/NOPB | ADC081S021CIMFX/NOPB | ADC081S051CISDX/NOPB |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | SOT-23-6 | SOT-23-6 - same | SOT-23-6 - same | SOT-23-6 - same | SOT-23-6 - same | SOT-23-6 - same |
| Resolution | 8 bits | 8 bits | 10 bits (+25%) | 12 bits (+50%) | 8 bits | 8 bits |
| Sample Rate | 500 ksps to 1 Msps | 500 ksps to 1 Msps | 500 ksps to 1 Msps | 500 ksps to 1 Msps | up to 200 ksps (-80%) | up to 500 ksps (-50%) |
| Supply Voltage | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V |
| Architecture | SAR | SAR | SAR | SAR | SAR | SAR |
| Serial Interface | SPI/QSPI/MICROWIRE/DSP | SPI/QSPI/MICROWIRE/DSP | SPI/QSPI/MICROWIRE/DSP | SPI/QSPI/MICROWIRE/DSP | SPI/QSPI/MICROWIRE/DSP | SPI/QSPI/MICROWIRE/DSP |
| Lifecycle Status | Obsolete | Active | Active | Active | Active | Active |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Key Differentiators
- Active lead-free drop-in path on existing footprint (vs obsolete ADC081S101CIMF bare part)
- Pin-compatible upgrade to higher resolution (vs ADC081S101CIMF (8-bit only))
- Lower sample-rate siblings for power optimization (vs ADC081S101CIMF at 1 Msps)
Design Notes
Estimated: Place a 1 µF X7R ceramic bypass capacitor within 2-3 mm of the VDD pin (pin 6), with a short, wide return trace to pin 5 (GND). Add a 0.1 µF high-frequency bypass in parallel for switching-noise suppression. Keep the analog input trace (pin 4) routed over a continuous ground pour and avoid crossing digital SPI traces; place the ADC close to the analog source to minimize track capacitance. The SOT-23-6 footprint tolerates standard lead-free reflow profiles per JEDEC J-STD-020 with peak temperatures up to 260°C.
Do not drive the analog input beyond VDD or below GND; the ADC081S101 input is single-ended with a 0V to VDD range and ESD diodes clamp to the rails. Always keep CS low during the entire SCLK frame and only deassert it between conversions, or the part will return wrong data. The serial clock must remain within the datasheet's SCLK frequency limit; an excessive rate can corrupt the DOUT output. When sharing the SPI bus with multiple devices, ensure no other device drives DOUT (pin 3) while CS of the ADC is asserted.
Estimated: For optimum noise performance, isolate the analog section from the digital section of the board with a single ground star at the ADC's GND pin. Use a separate analog ground pour under VIN and the bypass capacitor, stitching to the main ground only at one point. The 6-pin SOT-23-6 has no exposed thermal pad, so power dissipation is limited by the package's copper land thermal relief - typical 1.5 mW power dissipation in this family does not require a heat spreader. If your design is ratiometric with the supply, route VDD directly from the regulator output to avoid IR drop between reference and ADC.
Maintain short, impedance-controlled traces for SCLK and DOUT. Add a small series resistor (22-100 Ω) near the host MCU's SCLK output if reflections appear on the bus, especially when connecting to multiple SPI peripherals. SPI mode 0 (CPOL=0, CPHA=0) is the standard configuration for the ADC081S101 family, meaning the clock idles low and data is captured on the rising edge. Always issue 16 SCLK cycles per 8-bit conversion - the result plus four zeros - and only sample data on the falling edge of SCLK from DOUT per the datasheet timing diagram.
Compliance Information
The bare ADC081S101CIMF is obsolete per multiple distributors; the NOPB variant is the lead-free, RoHS-compliant, actively-manufactured orderable part. AEC-Q100 qualification has not been verified in the provided data.
