ISL2671286IBZ-T - 12-Bit 20kSPS SAR ADC | Renesas
MPN: ISL2671286IBZ-T ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.12 | $7.12 |
| 10 | $6.42 | $64.20 |
| 100 | $5.71 | $571.00 |
| 500 | $5.1 | $2,550.00 |
| 1,000 | $4.55 | $4,550.00 |
ISL2671286IBZ-T Overview
A SAR ADC is a successive-approximation-register analog-to-digital converter that uses a binary-search algorithm against an internal precision DAC to digitize an analog input in N conversion cycles for an N-bit code. SAR ADCs are favored for low-latency, single-shot conversions with no pipeline delay, and they offer excellent static linearity because every conversion uses the same precision comparator and DAC. In the broader data-converter hierarchy, SAR ADCs sit alongside delta-sigma and pipeline ADCs as the three dominant precision ADC architectures; SAR specifically targets multiplexed, multiplexed low-channel-count precision sampling up to a few megasamples per second.
Key features include a true-differential analog input, integrated track-and-hold, low power consumption suitable for battery-powered or loop-powered instruments, and an SPI/QSPI/MICROWIRE-compatible serial output interface. The 8-SOIC package is industry-standard, allowing straightforward PCB layout and easy drop-in replacement of legacy ADS1286 designs. The wide operating range and high linearity make the part suitable for industrial environments where supply and temperature variation would otherwise compromise measurement accuracy.
Typical applications include industrial process control loop transmitters, weigh-scale and load-cell digitizers, portable instrumentation, programmable logic controller (PLC) analog input modules, and battery monitoring systems. Designers select this ADC when a single-channel, low-latency, high-linearity conversion is required at sample rates up to 20 kSPS without the complexity of a multi-channel converter.
When designing with this part, pay attention to the analog input common-mode voltage and provide adequate input RC filtering to limit broadband noise. According to the manufacturer datasheet, the part provides a drop-in compatible alternative to all ADS1286 grades, meaning existing ADS1286 PCB layouts can be reused without modification. This page synthesizes distributor pricing, parametric alternatives, and practical design notes that go beyond the manufacturer datasheet.
Drop-in alternatives for ISL2671286IBZ-T — 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 ISL2671286IBZ-T (same form factor and footprint) — differing in Input Type, Package, Sampling Rate, Supply Voltage.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ISL2671286IBZ
✅ Drop-In📋 Reference alternative (not in catalog)
ISL2671286IBZ-T7A
✅ Drop-In📋 Reference alternative (not in catalog)
ISL26712
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADS1286U
✅ Drop-In✓ In Stock
$3.96 / Unit
View Datasheet →ISL2671286IBZ-T Maximum Ratings & Electrical Characteristics
| Resolution | 12 bits |
| Sampling Rate | 20 kSPS |
| Architecture | SAR (Successive Approximation Register) |
| Number of Input Channels | 1 |
| Input Type | Differential |
| Data Interface | SPI / QSPI / MICROWIRE-compatible serial |
| Supply Voltage | +5 V (single supply) |
| Operating Temperature Range | -40 C to +85 C |
| Package | 8-pin SOIC |
| Mounting Type | Surface Mount |
| Sample-and-Hold | Integrated |
| RoHS Status | Compliant |
| Carrier Type | Tape & Reel |
| Drop-in Compatibility | Pin-compatible with ADS1286 grades |
ISL2671286IBZ-T Pin Configuration
| Pin 1 | VDD — +5V analog supply |
| Pin 2 | IN+ — Differential analog input, non-inverting |
| Pin 3 | IN- — Differential analog input, inverting |
| Pin 4 | GND — Ground reference |
| Pin 5 | REF — Reference voltage input [DATA_NEEDED: ref type] |
| Pin 6 | CS — Chip select, active low (SPI) |
| Pin 7 | DOUT — Serial data output (SPI) |
| Pin 8 | CLK — Serial clock input (SPI) |
Typical Applications
ISL2671286IBZ-T is suitable for 6 applications: Industrial Process Control Loop Transmitter, Weigh-Scale and Load-Cell Digitizer, Portable Instrumentation Data Acquisition, PLC Analog Input Module, Battery Monitoring and Management, Programmable Logic Controller Sensor Front End.
Industrial Process Control Loop Transmitter
The ISL2671286IBZ-T's 12-bit resolution and 20 kSPS SAR architecture deliver the low-latency single-shot conversion that 4-20 mA loop transmitters require to digitize sensor signals on demand. With a differential analog input and excellent linearity over supply and temperature variations, the ADC maintains calibration accuracy in factory-floor environments where supply rails drift and ambient temperature swings are common. The SPI-compatible serial interface connects directly to a microcontroller that drives the HART modem or the loop DAC, while the 8-SOIC package fits inside the small transmitter head enclosure.
Recommended
Weigh-Scale and Load-Cell Digitizer
Load-cell bridge outputs in weigh-scale applications require a differential-input ADC with high DC linearity and low drift; the ISL2671286IBZ-T's true-differential input and 12-bit resolution support direct bridge digitisation without an instrumentation front end in low-precision scales. The integrated sample-and-hold and the SAR architecture ensure no pipeline delay, so each weight reading is a fresh single-shot conversion - critical for settling after a load change. The 8-SOIC package fits alongside the bridge excitation op-amp on a compact scale PCB.
Recommended
Portable Instrumentation Data Acquisition
Handheld multimeters, calibration tools, and field instruments need a low-power single-channel ADC that can digitize slowly-changing sensor signals with high linearity; the ISL2671286IBZ-T's +5V single-supply operation and modest sample-rate envelope keep battery drain low while delivering 12-bit accuracy. The differential input rejects common-mode ground noise from long sensor leads - a common problem when the field technician measures at the end of a long cable run. The 8-SOIC package is small enough to fit handheld enclosures, and the industrial -40C to +85C range covers outdoor use.
Recommended
PLC Analog Input Module
Programmable logic controller analog input modules digitize 0-10V or 4-20 mA field signals at moderate sample rates and route the data to the controller backplane. The ISL2671286IBZ-T's 20 kSPS sample rate and differential input suit multiplexed low-channel-count modules where one ADC serves several inputs through an external mux. The SPI-compatible digital interface connects to the module's microcontroller with no glue logic, and the 8-SOIC footprint is easy to lay out on a dense PLC module PCB alongside isolation barriers.
Recommended
Battery Monitoring and Management
Battery management systems in UPS, e-bike, and small-EV packs require accurate cell-voltage measurement at modest sample rates; the ISL2671286IBZ-T's differential input can digitize a single cell or stack voltage with common-mode rejection that suppresses the high dV/dt transients of the power stage. The SAR architecture provides immediate, deterministic conversion results - critical when the BMS must react quickly to over-voltage conditions. The +5V single supply aligns with the typical auxiliary rail in BMS designs.
Recommended
Programmable Logic Controller Sensor Front End
Industrial sensor front ends digitize signals from thermocouples, RTDs, and strain gauges where the ADC's linearity over temperature directly affects measurement accuracy. The ISL2671286IBZ-T's documented excellent linearity over supply and temperature variations makes it a fit for these precision analog front ends. The 8-SOIC package is pin-compatible with the legacy TI ADS1286 footprint, allowing drop-in replacement on existing PLC analog cards that are migrating from TI to Renesas supply.
Recommended
Recommended Products Summary
Engineering reference data for ISL2671286IBZ-T — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ISL2671286IBZ | ISL2671286IBZ-T7A | ISL26712 | ADS1286U | ADS1286P |
|---|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Texas Instruments | Texas Instruments |
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-PDIP - different (through-hole) |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Architecture | SAR | SAR | SAR | SAR | SAR | SAR |
| Interface | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE |
Key Differentiators
- Single-supply +5V operation with documented drop-in ADS1286 compatibility (vs ADS1286U (TI))
- Differential analog input for industrial common-mode noise rejection (vs ADS1286P (TI, 8-PDIP))
- Industrial -40C to +85C operating temperature window (vs ADS1286 commercial grade)
Design Notes
Estimated: The ISL2671286IBZ-T operates from a single +5V analog supply; place a 10uF bulk decoupling capacitor close to the VDD pin and a 0.1uF ceramic bypass cap in parallel to suppress high-frequency noise. The ADC's reference voltage input should be bypassed with a 10uF (or larger) low-ESR capacitor - SAR ADCs draw transient current from the reference at each bit decision, and insufficient decoupling is the most common cause of degraded linearity.
Keep the analog input traces short and symmetric for the differential IN+ and IN- pair; route them away from digital clocks and switching nodes to avoid coupled common-mode noise. The 8-SOIC package has the GND pin (typically pin 4) at the analog side - connect the analog ground plane directly to this pin and use a single-point connection between analog and digital ground near the ADC to avoid ground loops.
Do not exceed the absolute maximum analog input voltage of VDD + 0.3V; over-voltage on the input will permanently damage the sample-and-hold switches. When using the part as a drop-in replacement for the ADS1286, verify that the timing characteristics (SCLK frequency, tACQ acquisition time) match the system clock - the ISL2671286 datasheet specifies timing parameters that may differ slightly from the legacy ADS1286 specification even though the pinout is identical.
Compliance Information
RoHS compliant per Renesas product page. REACH, halogen-free, and conflict-minerals declarations should be requested from Renesas as the latest material declaration datasheet was not provided in the verified web data.
