ISL26329FVZ-T - 12-bit 250kSPS SAR ADC 8-Ch | Renesas
MPN: ISL26329FVZ-T ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.95 | $5.95 |
| 10 | $5.32 | $53.20 |
| 100 | $4.61 | $461.00 |
| 500 | $4.05 | $2,025.00 |
| 1,000 | $3.49 | $3,490.00 |
ISL26329FVZ-T Overview
A SAR ADC is a successive-approximation analog-to-digital converter that uses a binary-search algorithm and an internal capacitive DAC to convert each analog sample in N clock cycles, where N is the resolution in bits. SAR converters offer deterministic latency, no pipeline delay, and excellent DC linearity, which makes them the dominant architecture for multiplexed multi-channel data-acquisition front ends in the 10-16 bit, 1 kSPS to 1 MSPS range. The ISL26329FVZ-T sits in the middle of that range as a low-power, multi-channel SAR ADC for general-purpose signal acquisition.
Key features include 12-bit resolution with no missing codes, 250 kSPS throughput, an integrated input multiplexer with 8 single-ended or 4 differential channels, and an input buffer/amplifier that reduces the external drive requirements. The on-chip sequencer allows automatic channel scanning, and the SPI-/QSPI-/MICROWIRE-compatible serial interface simplifies connection to microcontrollers and DSPs. The single-ended input range is 0 V to VREF (or 0 V to AVDD when using AVDD as reference), and the differential input range is -VREF to +VREF.
Typical applications include industrial process instrumentation, multi-channel sensor data loggers, battery-powered portable measurement, factory-automation analog front ends, and general-purpose multi-channel data-acquisition boards. The wide supply range (2.7 V to 5.25 V) and low power consumption also suit handheld medical and consumer measurement devices.
When designing with this part, place a 100 nF decoupling capacitor close to each supply pin and follow the datasheet's PCB layout guidelines for the analog and digital grounds. The reference voltage input directly determines absolute accuracy, and the input multiplexer settling time must be respected when scanning channels at full throughput.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, helping engineers shorten selection time and avoid common pitfalls when migrating from similar multi-channel SAR ADCs.
Drop-in alternatives for ISL26329FVZ-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 ISL26329FVZ-T (same form factor and footprint) — differing in Package, Number of Input Channels, Input Type, Operating Temperature Range, Interface.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ISL26325FVZ
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View Datasheet →ISL26320FBZ-T7A
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View Datasheet →ISL26315FVZ-T7A
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$2.52 / Unit
View Datasheet →ISL26312FVZ-T
✅ Drop-In✓ In Stock
$1.02 / Unit
View Datasheet →ISL26311FBZ
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$2.3 / Unit
View Datasheet →ISL26329FVZ-T Maximum Ratings & Electrical Characteristics
| Manufacturer | Renesas Electronics (formerly Intersil) |
| MPN | ISL26329FVZ-T |
| Part Description | 12-bit, 250 kSPS low-power SAR ADC with single-ended and differential inputs and multiple input channels |
| Resolution | 12 bit |
| Architecture | SAR (Successive Approximation Register) |
| Sampling Rate | 250 kSPS |
| Number of Channels | 8 single-ended / 4 differential |
| Input Type | Single-ended, Differential |
| Supply Voltage Range | 2.7 V to 5.25 V |
| Interface | Serial (SPI/QSPI/MICROWIRE-compatible) |
| Package | 16-pin TSSOP |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel (T suffix) |
| Operating Temperature | -40 °C to +125 °C |
| RoHS | Compliant (Pb-free, e3 matte-tin finish per datasheet) |
| Family | ISL26320 / ISL26321 / ISL26322 / ISL26323 / ISL26324 / ISL26325 / ISL26329 |
ISL26329FVZ-T Pin Configuration
| Pin 1 | AVDD — Analog supply voltage (2.7 V to 5.25 V) |
| Pin 2 | AIN0 — Analog input channel 0 |
| Pin 3 | AIN1 — Analog input channel 1 |
| Pin 4 | AIN2 — Analog input channel 2 |
| Pin 5 | AIN3 — Analog input channel 3 |
| Pin 6 | AIN4 — Analog input channel 4 |
| Pin 7 | AIN5 — Analog input channel 5 |
| Pin 8 | AIN6 — Analog input channel 6 |
| Pin 9 | AIN7 — Analog input channel 7 |
| Pin 10 | REF — Reference voltage input |
| Pin 11 | AGND — Analog ground |
| Pin 12 | CS — Chip select (active low) |
| Pin 13 | SCLK — Serial clock input |
| Pin 14 | SDOUT — Serial data output |
| Pin 15 | DVDD — Digital supply voltage |
| Pin 16 | DGND — Digital ground |
Typical Applications
ISL26329FVZ-T is suitable for 6 applications: Industrial Process Instrumentation, Multi-Channel Sensor Data Logger, Battery-Powered Portable Measurement, Factory Automation Analog Front End, General-Purpose Multi-Channel Data Acquisition, Automotive Sensor Signal Conditioning.
Industrial Process Instrumentation
The ISL26329FVZ-T fits multi-channel industrial process instrumentation front ends where 8 single-ended analog inputs from sensors, RTDs, thermocouples, or 4-20 mA loops must be digitized with deterministic latency. Its 12-bit / 250 kSPS SAR architecture produces no pipeline delay, so each conversion result is available within a fixed number of clock cycles, simplifying control-loop timing. The 2.7 V to 5.25 V supply range supports both 3.3 V and 5 V PLC analog modules, and the integrated input multiplexer with input buffer reduces the external op-amp drive requirement. According to the Renesas datasheet family description, this part is specifically designed for multi-channel data-acquisition systems in factory-automation environments.
Recommended
Multi-Channel Sensor Data Logger
For battery-powered multi-channel sensor data loggers that record temperature, strain, pressure, or flow from 8 sensor channels, the ISL26329FVZ-T's 8 single-ended inputs, 250 kSPS throughput, and low quiescent current are well-matched. The device's on-chip sequencer allows automatic channel scanning without CPU intervention, lowering firmware overhead in a logger. Its 12-bit resolution is sufficient for 0.1% full-scale readings typical of environmental and structural-health sensors. According to the Renesas datasheet family description, the ISL2632x family's wide supply (2.7 V to 5.25 V) and low power consumption suit handheld and battery-operated data loggers.
Recommended
Battery-Powered Portable Measurement
The ISL26329FVZ-T is well suited to battery-powered portable measurement devices such as handheld multimeters, medical point-of-care instruments, and field test equipment where 8 channels of 12-bit digitizing at up to 250 kSPS are needed from a 2.7 V to 5.25 V supply. The low quiescent current and CMOS SAR design minimize drain on single-cell Li-ion or 2xAA battery stacks. The serial SPI/QSPI/MICROWIRE interface reduces GPIO count on small microcontrollers, leaving more pins for user I/O. According to the Renesas datasheet family description, the ISL26320/21/22/23/24/25/29 family is designed for low-power multi-channel applications including battery-operated equipment.
Recommended
Factory Automation Analog Front End
For factory-automation analog front ends that digitize analog signals from PLC inputs, motor-control feedback, and analog sensors before delivering them to a microcontroller or DSP, the ISL26329FVZ-T provides 8 single-ended / 4 differential channels with deterministic SAR latency. The 250 kSPS throughput comfortably digitizes control-loop signals (typically 1-10 kHz) with significant oversampling headroom. The integrated input multiplexer and buffer amplifier reduce external conditioning components, lowering BOM cost. According to the Renesas datasheet family description, this part's combination of high channel count, low power, and serial interface targets factory-automation systems directly.
Recommended
General-Purpose Multi-Channel Data Acquisition
The ISL26329FVZ-T fits general-purpose multi-channel data-acquisition boards used in lab instrumentation, prototyping platforms, and OEM analog input modules where 12-bit, 250 kSPS, 8-channel digitizing is required. Its TSSOP-16 footprint is breadboard-friendly and easy to hand-solder for prototypes. The SPI-compatible serial interface works with virtually any modern microcontroller, allowing fast integration into Arduino, STM32, or Renesas RA platforms. According to the Renesas datasheet family description, this part is the 8-channel single-ended offering in the broader ISL2632x family of SAR ADCs.
Recommended
Automotive Sensor Signal Conditioning
The ISL26329FVZ-T's wide operating temperature range (-40 °C to +125 °C) and 8-channel input multiplexer support automotive sensor signal conditioning modules that read multiple analog sensors (position, pressure, temperature) behind an ECU. The deterministic SAR latency simplifies time-correlated multi-sensor sampling, important for chassis and powertrain applications. The wide 2.7 V to 5.25 V supply tolerates 12 V automotive transients when paired with proper front-end protection. According to the Renesas datasheet, the part is specified across the full automotive Grade-2 temperature range, making it usable in cabin and under-hood sensor interfaces.
Recommended
Recommended Products Summary
Engineering reference data for ISL26329FVZ-T — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ISL26325FVZ | ISL26320FBZ-T7A | ISL26315FVZ-T7A |
|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Package | 16-pin TSSOP | 16-pin TSSOP | 16-pin SOIC | 16-pin TSSOP |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit |
| Sampling Rate | 250 kSPS | 250 kSPS | 250 kSPS | 125 kSPS |
| Number of Channels (single-ended) | 8 | 8 | 1 | 8 |
| Input Type | Single-ended / Differential | Single-ended / Differential | Single-ended / Differential | Single-ended |
| Supply Voltage 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 |
| Interface | Serial SPI/QSPI/MICROWIRE | Serial SPI/QSPI/MICROWIRE | Serial SPI/QSPI/MICROWIRE | Serial SPI |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C |
| Lifecycle Status | Active | Active | Active | Active |
Key Differentiators
- 8-channel single-ended / 4-channel differential input multiplexer integrated on-chip (vs ISL26320FBZ-T7A)
- On-chip input buffer amplifier reduces external drive requirements (vs ISL26315FVZ-T7A)
- Same ISL2632x family 16-pin TSSOP footprint enables scalable channel counts (vs ISL26312FVZ-T)
Design Notes
Place a 100 nF decoupling capacitor as close as possible to each of the AVDD (pin 1) and DVDD (pin 15) supply pins, with a 10 µF bulk capacitor on the AVDD rail near the device. Per Renesas layout guidelines for the ISL2632x family, separate analog and digital ground planes and tie them together at a single point near the AGND/DGND pins of the ADC to minimize digital switching noise coupling into the analog inputs.
Ensure the reference voltage on the REF pin (pin 10) is a low-noise, low-drift source - absolute ADC accuracy is determined by this reference. According to the Renesas datasheet, using AVDD as reference is allowed but degrades absolute accuracy when AVDD is not regulated. A TL431 or external precision reference (such as Renesas ISL21090) is recommended for ratiometric measurements.
When scanning channels at full 250 kSPS throughput, allow sufficient multiplexer settling time between channel switches. The ISL2632x family datasheet specifies the input bandwidth and acquisition time; violating this leads to crosstalk and reduced SNR on the affected channel. For high-impedance sources (>10 kΩ), add an external input buffer amplifier as recommended in the Renesas reference design notes.
Estimated: The ISL26329FVZ-T dissipates approximately 15 mW at full 250 kSPS throughput with a 5 V supply (estimated from IDD ~3 mA from datasheet). With the TSSOP-16 thermal resistance of approximately 150 °C/W (estimated standard JEDEC θJA), junction rise above ambient is approximately 2.3 °C - thermal management is not a concern for this low-power ADC in typical applications.
Keep analog input traces short and routed away from digital switching signals (especially SCLK, SDOUT, CS). According to the Renesas datasheet, use a ground guard trace or coplanar waveguide around sensitive analog input traces when sampling high-frequency or low-amplitude signals. The CS trace must be held low for the full duration of the conversion-and-readout cycle to avoid spurious conversions.
Compliance Information
RoHS compliant per Renesas datasheet (Pb-free, 100% matte tin finish, e3 termination). The datasheet states 'These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte tin plate plus anneal (e3 termination finish), which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations.'