ISL26323FBZ-T - 12-bit 250kSPS Dual-Channel Low-Power SAR ADC | Renesas
MPN: ISL26323FBZ-T ✓ 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 |
ISL26323FBZ-T Overview
A SAR ADC is a type of analog-to-digital converter that uses a binary-search successive-approximation algorithm to convert an analog input to a digital code in a fixed number of clock cycles, typically one per bit. SAR ADCs sit within the broader data-converter family (SAR -> ADC -> data converter -> mixed-signal IC -> semiconductor), and are valued for their deterministic latency, low power consumption, and high effective resolution per sample. The ISL26323FBZ-T specifically targets the 12-bit precision segment with sample rates up to 250 kSPS, making it well suited for industrial sensor readout, multi-channel data acquisition, and instrumentation front ends.
Key features of the ISL26323FBZ-T include up to 5 kV Human Body Model ESD survivability, guaranteed monotonic operation, and an industrial temperature range of -40 °C to +125 °C. Its single-ended/differential input flexibility allows the same PCB footprint to accept either sensor type without a re-design, while the SPI/serial digital interface reduces microcontroller pin count compared to parallel-output ADCs.
Typical applications include industrial process control loops, multi-channel temperature and pressure monitoring, PLC analog input modules, battery-cell voltage monitoring in BMS front ends, and general-purpose data-acquisition systems. The wide analog supply range (2.7 V to 5.25 V) supports both 3.3 V and 5 V microcontroller environments with the same BOM.
When designing with this part, ensure the analog and digital grounds are tied together at a single point near the IC, and place the 10 µF bulk + 0.1 µF bypass capacitors as close to the AVDD pin as possible. The SOT-23-6/8-SOIC thermally enhanced package allows continuous operation at full sample rate without thermal throttling, but the input RC antialiasing filter should be sized to keep the -3 dB bandwidth below the Nyquist frequency of 125 kHz for 250 kSPS throughput.
This page synthesizes verified distributor pricing, pin-compatible drop-in alternatives, and practical design notes not consolidated in the Renesas datasheet PDF.
Drop-in alternatives for ISL26323FBZ-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 ISL26323FBZ-T (same form factor and footprint) — differing in Package, Input Type, Interface, Number of Input Channels, Operating Temperature Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ISL26323FBZ-T7A
✅ Drop-In✓ In Stock
$2.65 / Unit
View Datasheet →ISL26322FBZ-T
✅ Drop-In📋 Reference alternative (not in catalog)
ISL26324FBZ-T
✅ Drop-In📋 Reference alternative (not in catalog)
ISL26321FBZ-T
✅ Drop-In📋 Reference alternative (not in catalog)
ISL26320FBZ-T7A
✅ Drop-In✓ In Stock
$3.45 / Unit
View Datasheet →ISL26323FBZ-T Maximum Ratings & Electrical Characteristics
| Resolution | 12 bit |
| Sample Rate | 250 kSPS |
| Number of Channels | 2 (differential/single-ended, software configurable) |
| Architecture | SAR (Successive Approximation Register) |
| Analog Supply Voltage (AVDD) | 2.7 V to 5.25 V |
| Input Type | Single-ended or differential (software-selectable) |
| Digital Interface | SPI / serial-compatible |
| ESD Survivability | 5 kV HBM |
| Operating Temperature Range | -40 °C to +125 °C (industrial) |
| Package | 8-pin SOIC (N) — JEDEC MS-012 |
| Mounting Type | Surface Mount |
| MSL Level | MSL1 (per JEDEC J-STD-020, assumed for SOIC) |
| RoHS Status | Compliant |
| Lead-Free | Yes |
ISL26323FBZ-T Pin Configuration
| Pin 1 | CS/SHDN — Chip select / shutdown (active low) |
| Pin 2 | AIN+ — Analog input positive (single-ended or differential) |
| Pin 3 | AIN- — Analog input negative (tied to GND in single-ended mode) |
| Pin 4 | GND — Ground |
| Pin 5 | REF — Reference voltage input (decouple with 10uF + 0.1uF) |
| Pin 6 | AVDD — Analog supply voltage (2.7 V to 5.25 V) |
| Pin 7 | SCLK — Serial clock input |
| Pin 8 | SDOUT/DOUT — Serial data output |
Typical Applications
ISL26323FBZ-T is suitable for 7 applications: Industrial Process Control Loop, Multi-Channel Temperature Monitoring, PLC Analog Input Module, Battery Management System (BMS) Cell Voltage Monitoring, General-Purpose Data Acquisition (DAQ) System, Sensor Signal Conditioning Front End, Portable / Handheld Test Instruments.
Industrial Process Control Loop
The ISL26323FBZ-T's 12-bit resolution and 250 kSPS throughput suit closed-loop industrial process control, where 2 differential channels accept signals from current-loop transducers (4-20 mA) after a sense resistor. The wide 2.7 V to 5.25 V AVDD range lets the same ADC interface directly to 3.3 V or 5 V microcontrollers used in PLC analog-input modules. SPI serial interface reduces MCU pin count versus parallel-output SAR ADCs, while the -40 °C to +125 °C industrial temperature range ensures continuous operation in factory cabinets.
Recommended
Multi-Channel Temperature Monitoring
The ISL26323FBZ-T can scan two thermistor or RTD bridges simultaneously at 250 kSPS aggregate, supporting parallel temperature probes in HVAC and refrigeration systems. The software-configurable single-ended/differential input lets the same pin pair read either a resistive divider (single-ended) or a Wheatstone bridge (differential) without hardware rework. The low power consumption preserves battery life in portable temperature dataloggers, while the 5 kV HBM ESD rating protects against ESD events common during field installation of sensor cables.
Recommended
PLC Analog Input Module
The ISL26323FBZ-T's SPI-compatible serial interface and 2-channel input make it ideal for compact PLC analog-input modules where PCB area is at a premium. Up to 250 kSPS allows simultaneous sampling of two analog signals with deterministic cycle time, critical for time-correlated measurements in industrial automation. The SOIC-8 package is hand-solderable for prototypes and is JEDEC MS-012 standard, easing PCB layout and rework.
Recommended
Battery Management System (BMS) Cell Voltage Monitoring
The ISL26323FBZ-T monitors up to 2 series-stacked Li-ion cells with 12-bit resolution (4.88 mV per LSB at 5 V reference), enabling accurate cell-balancing decisions in BMS front ends. The 2.7 V to 5.25 V AVDD range supports 3.3 V or 5 V bias rails used in portable battery packs, while the low quiescent current preserves battery life in standby. The 5 kV HBM ESD withstands hot-plug transients common during battery pack assembly.
Recommended
General-Purpose Data Acquisition (DAQ) System
The ISL26323FBZ-T integrates into USB-based DAQ modules and benchtop instruments requiring 2 analog inputs at 12-bit/250 kSPS. Its serial interface simplifies isolation barrier design (fewer digital lines to isolate) and supports up to 16 devices on one SPI bus through CS/SHDN bar chip-select, multiplying the effective channel count without extra MCU pins. The industrial -40 °C to +125 °C range ensures reliable operation in lab and field environments.
Recommended
Sensor Signal Conditioning Front End
The ISL26323FBZ-T digitizes outputs from bridge sensors (load cells, pressure transducers) thanks to its differential input mode, eliminating the need for an external instrumentation amplifier in many 12-bit applications. The SAR architecture provides no-latency conversion (one sample per trigger) for synchronous data capture, while the 2.7 V to 5.25 V AVDD supports bridge excitation voltages of 3.3 V or 5 V from the same rail. Industrial temperature range suits outdoor sensor installations.
Recommended
Portable / Handheld Test Instruments
The ISL26323FBZ-T's low-power SAR architecture and 2-channel input fit handheld multimeters and insulation testers requiring accurate voltage and current measurements from a single battery pack. Its small SOIC-8 footprint suits cramped handheld enclosures, while the SPI interface allows direct connection to low-pin-count microcontrollers. The 5 kV HBM ESD rating survives cable-discharge events common in field instrumentation.
Recommended
Recommended Products Summary
Engineering reference data for ISL26323FBZ-T — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ISL26323FBZ-T7A | ISL26322FBZ-T | ISL26324FBZ-T | ISL26321FBZ-T | ISL26320FBZ-T7A |
|---|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Package | SOIC-8 (JEDEC MS-012) | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Sample Rate | 250 kSPS | 250 kSPS | 250 kSPS | 250 kSPS | 250 kSPS | 250 kSPS |
| Number of Channels | 2 (single-ended or differential) | 2 (same) | 2 (single-ended only) | 4 (single-ended/differential) | 1 (differential) | 1 (single-ended) |
| AVDD Range | 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 |
| Digital Interface | SPI/serial | SPI/serial | SPI/serial | SPI/serial | SPI/serial | SPI/serial |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C |
| Reel Quantity | 1000 pcs (-T) | 250 pcs (-T7A) | 1000 pcs | 1000 pcs | 1000 pcs | 250 pcs |
Key Differentiators
- Pin-compatible family upgrade path from 1 to 4 channels (vs ISL26320FBZ-T7A (1-ch single-ended))
- Software-configurable single-ended or differential inputs in same package (vs ISL26321FBZ-T (1-channel differential-only))
- Wide AVDD range (2.7 V to 5.25 V) supports 3.3 V and 5 V rails (vs ADS7825UE4 (TI 5 V only))
- 5 kV HBM ESD rating for industrial robustness (vs AD7920BRMZ (no ESD rating published))
Design Notes
Decouple AVDD (pin 6) with a 10 µF tantalum or ceramic bulk capacitor plus a 0.1 µF ceramic placed within 5 mm of the pin. The reference input (REF, pin 5) requires the same 10 µF + 0.1 µF pair - inadequate REF decoupling is the leading cause of noisy SAR ADC readings. AVDD and REF should track each other; route them with wide (>20 mil) traces and a star-ground topology.
Keep the analog input traces (AIN+, AIN-) short and symmetric to avoid common-mode noise pickup. Use a guard ring tied to GND around the input traces if the surrounding PCB has switching converter or digital logic. Place the IC away from high-dV/dt traces (switching node of buck regulators, clock signals) by at least 5 mm or shield with a grounded copper fill.
Estimated: at 250 kSPS through a single RC antialiasing filter with R = 1 kΩ and C = 1 nF, the -3 dB bandwidth is approximately 160 kHz, which is ABOVE the Nyquist frequency of 125 kHz for 250 kSPS. Either increase R or decrease C to push the filter cutoff below 125 kHz, or accept aliasing of out-of-band noise. The default CS/SHDN bar pin must be pulled high between conversions to keep the part in normal mode; leaving it floating forces shutdown and yields all-zero readings.
The SOIC-8 package benefits from a small thermal pad (pin 4 GND copper pour) to reduce ground bounce. Route the SPI digital lines (SCLK, SDOUT) on the opposite side of the PCB from the analog inputs to avoid digital-to-analog crosstalk. If multiple ISL2632x ADCs share one SPI bus, give each its own CS/SHDN bar signal rather than daisy-chaining.
Compliance Information
RoHS and lead-free status per Renesas product page. Industrial temperature grade -40 °C to +125 °C (not AEC-Q100 automotive qualified).
