ISL26323FBZ - 12-Bit 250kSPS Dual-Channel SAR ADC | Renesas
MPN: ISL26323FBZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.92 | $4.92 |
| 10 | $4.42 | $44.20 |
| 100 | $3.71 | $371.00 |
| 500 | $3.2 | $1,600.00 |
| 1,000 | $2.78 | $2,780.00 |
ISL26323FBZ Overview
An analog-to-digital converter (ADC) is a data converter that translates real-world continuous voltages into discrete digital codes. SAR ADCs in particular use a binary-search capacitor array and comparator to resolve one bit per clock cycle, delivering deterministic latency with no pipeline delay - which makes them well suited to multiplexed multi-channel data-acquisition systems and control loops where deterministic timing matters. The ISL26323 sits in the precision-data-acquisition product hierarchy: SAR ADC -> ADC -> data converter -> signal chain IC -> semiconductor.
Key features include INL of ±1 LSB maximum, DNL of ±1 LSB maximum, an internal 2.5 V reference option (with external reference override up to 5 V), an SPI-/QSPI-/MICROWIRE-compatible serial interface, a hardware SHND pin, and a true-differential analog input structure that rejects common-mode noise. The 8-pin SOIC footprint simplifies PCB layout and is compatible with standard surface-mount assembly lines.
The device uses a charge-redistribution SAR core with a proprietary input multiplexer and input buffer, lowering the drive requirement on the upstream sensor or instrumentation amplifier. A throughput of 250 kSPS is sufficient for vibration, motor-control, and precision-sensor signal chains that previously required expensive delta-sigma converters.
Typical applications include industrial process control loop digitization, multi-channel temperature sensing via RTD or thermocouple front ends, battery-cell voltage monitoring in 12 V/24 V/48 V battery-management systems, portable instrumentation, and PLC analog input modules. The wide supply range and small footprint also suit it to point-of-load digitization in factory-automation I/O cards.
When designing with the ISL26323FBZ, treat the analog ground return as a star-grounded island separate from noisy digital returns; route SCLK, SDO, and CONVST traces over a continuous ground plane to limit digital coupling into the sample-and-hold. The shutdown pin can cut supply current to under 1 microamp for battery-powered sensor nodes.
This page synthesizes distributor pricing for the ISL26323FBZ, drop-in same-package alternatives from the ISL263xx family, and practical PCB and reference-layout notes not found in the manufacturer datasheet, giving engineers a single, citation-ready reference for new designs and field replacements.
Drop-in alternatives for ISL26323FBZ — 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 (same form factor and footprint) — differing in Package, Input Type, Number of Input Channels, Operating Temperature Range, Interface.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ISL26323FBZ-T
✅ Drop-In✓ In Stock
$2.62 / Unit
View Datasheet →ISL26323FBZ-T7A
✅ Drop-In✓ In Stock
$2.65 / Unit
View Datasheet →ISL26320FBZ-T7A
✅ Drop-In✓ In Stock
$3.45 / Unit
View Datasheet →ISL26311FBZ
✅ Drop-In✓ In Stock
$2.3 / Unit
View Datasheet →ISL26323FBZ Maximum Ratings & Electrical Characteristics
| Resolution | 12 bit |
| Sample Rate | 250 kSPS |
| Number of Input Channels | 2 (single-ended) |
| ADC Architecture | SAR (Successive Approximation Register) |
| Input Type | Single-ended / pseudo-differential |
| Analog Supply Voltage | 2.7 V to 5.25 V |
| Digital Supply Voltage | 2.7 V to 5.25 V |
| Reference Voltage | Internal 2.5 V or external up to 5 V |
| INL (max) | ±1 LSB |
| DNL (max) | ±1 LSB |
| Supply Current (typ @ 250 kSPS) | 2.5 mA |
| Interface | SPI / QSPI / MICROWIRE-compatible serial |
| Shutdown Pin | Yes (active-low SHND) |
| Package | 8-pin SOIC (NB) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40 °C to +85 °C (industrial) |
| RoHS Status | Compliant |
ISL26323FBZ Pin Configuration
| Pin 1 | VIN0 — Analog input channel 0 (single-ended) |
| Pin 2 | VIN1 — Analog input channel 1 (single-ended) |
| Pin 3 | VREF — Reference voltage input/output (internal 2.5 V or external up to 5 V) |
| Pin 4 | AGND — Analog ground |
| Pin 5 | SHND — Active-low shutdown (drive high to enable) |
| Pin 6 | SDO — Serial data output (SPI MISO) |
| Pin 7 | SCLK — Serial clock input (SPI SCLK) |
| Pin 8 | VDD — Analog/digital supply (2.7 V to 5.25 V) |
Typical Applications
ISL26323FBZ is suitable for 6 applications: Industrial Process Control Loop Digitization, Multi-Channel Temperature Sensor Readout, Battery Cell Voltage Monitoring, PLC Analog Input Module, Portable Instrumentation and Data Loggers, Factory Automation Analog I/O Cards.
Industrial Process Control Loop Digitization
The ISL26323FBZ is a strong fit for industrial 4-20 mA loop digitization because it offers 12-bit resolution at 250 kSPS, sufficient to resolve 0.1% of a 5 V analog span with deterministic SAR latency. Placed at the output of an INA128 instrumentation amplifier, it samples the conditioned loop voltage and streams SPI-compatible codes to a host MCU; the SHND pin allows sleep-mode idle current to drop to under 1 µA between scans. Compared to delta-sigma alternatives, the SAR architecture gives a single-cycle conversion that simplifies control-loop math.
Recommended
Multi-Channel Temperature Sensor Readout
For thermocouple or RTD arrays, the ISL26323FBZ's two single-ended inputs accept multiplexed or simultaneous temperature signals with 12-bit precision over a 0 V to VREF range. The internal 2.5 V reference eliminates the need for an external reference IC at moderate accuracy, simplifying the BOM. Use the SHND pin to duty-cycle conversions, cutting average supply current well below the 2.5 mA DC figure, which extends battery life in portable thermometry. The 8-pin SOIC NB package fits tight sensor-node PCBs.
Recommended
Battery Cell Voltage Monitoring
The ISL26323FBZ is well suited to per-cell voltage monitoring in 12 V/24 V/48 V battery-management systems where two cells per ADC suffice and 12-bit resolution is acceptable. Its 2.7 V to 5.25 V analog supply range aligns with 3.3 V and 5 V battery-pack rails, and its 2.5 mA supply current is low enough for continuous monitoring on a modest LDO. SAR latency keeps cell-by-cell scans deterministic for coulomb-counting firmware, avoiding the group-delay surprises that delta-sigma converters introduce.
Recommended
PLC Analog Input Module
PLC analog input modules use the ISL26323FBZ to digitize voltage or current inputs at the I/O terminal block with 12-bit precision. The SPI interface streams codes to the PLC backplane MCU or FPGA without bus contention, and the 8-pin SOIC NB package allows dense channel count on the analog-front-end PCB. The internal 2.5 V reference and active-low SHND pin simplify loop-power sequencing; the SAR core delivers single-cycle conversions that match deterministic PLC scan times.
Recommended
Portable Instrumentation and Data Loggers
Handheld data loggers and portable instrumentation use the ISL26323FBZ to digitize two analog signals at 250 kSPS with 12-bit accuracy while running from a 3.3 V Li-ion rail. The shutdown pin reduces quiescent current to less than 1 µA between acquisitions, extending battery runtime for field surveys and IoT sensor data loggers. The SOIC-8 footprint allows hand-rework and a small front-end PCB, valuable in low-volume instrumentation builds.
Recommended
Factory Automation Analog I/O Cards
Modular analog I/O cards in factory-automation systems embed the ISL26323FBZ to provide two isolated or non-isolated precision analog inputs per slot. The 12-bit, 250 kSPS throughput handles 10 kHz-class vibration and strain-gauge signals with adequate bandwidth, and the SPI/QSPI/MICROWIRE compatibility simplifies interface to backplane FPGAs. The wide supply range (2.7 V to 5.25 V) supports both 3.3 V and 5 V backplane rails commonly used in PLC and DCS I/O architectures.
Recommended
Recommended Products Summary
Engineering reference data for ISL26323FBZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ISL26323FBZ-T | ISL26323FBZ-T7A | ISL26320FBZ-T7A | ISL26311FBZ |
|---|---|---|---|---|---|
| Package | 8-pin SOIC (NB) | 8-pin SOIC (NB) - same | 8-pin SOIC (NB) - same | 8-pin SOIC (NB) - same | 8-pin SOIC (NB) - same |
| Brand | Renesas Electronics | Renesas Electronics - same | Renesas Electronics - same | Renesas Electronics - same | Renesas Electronics - same |
Key Differentiators
- True two-channel single-ended input in 8-pin SOIC NB (vs ISL26320FBZ-T7A)
- Lower cross-brand substitute density in 8-pin SOIC footprint (vs ADS7223 (Texas Instruments))
- Integrated 2.5 V reference eliminates external reference IC (vs External-only reference ADCs)
Design Notes
Treat AGND as a star-grounded island tied to system ground at a single point near the power-entry filter. Route SCLK, SDO, and any active-low shutdown trace over a continuous ground plane. Place the VREF decoupling capacitor (typically 10 µF ceramic plus 0.1 µF) within 5 mm of the VREF pin to keep reference noise below 12-bit LSB. Estimated: input-referred noise of an LSB is 5 V / 4096 ≈ 1.22 mV, so VREF ripple must stay below ~120 µV for 10 LSB accuracy.
Do not leave SHND floating - if unused, tie SHND high (logic-high) through a 10 kΩ resistor to VDD to guarantee the part powers up active. Failing to do so may leave the converter in shutdown with SDO high-impedance, and the host MCU sees no conversions. Verify SHND logic level against your MCU's GPIO rail: SHND is referenced to VDD, not to a fixed 3.3 V.
Keep analog input traces (VIN0, VIN1) short and symmetric, and surround them with AGND guard traces if the input source impedance is greater than 1 kΩ. Source impedance greater than ~5 kΩ can degrade AC performance at 250 kSPS because the input sampling capacitor has finite settling time. For high-impedance sources, add an op-amp buffer (e.g. AD8628) within 10 mm of the input pin.
The 8-pin SOIC NB dissipates roughly 12.5 mW at 2.5 mA / 5 V VDD, well within the package's thermal envelope. No heatsink or thermal copper pour is required. Estimated: junction temperature rise above ambient at 25 °C is below 1 °C, so the part can be operated at full 250 kSPS throughput in enclosed housings without thermal derating.
Compliance Information
RoHS and REACH compliance per Renesas product page; the part is not AEC-Q100 qualified (industrial -40 °C to +85 °C only) - choose an automotive-grade Renesas ADC if AEC-Q100 is required.
