ISL26325FVZ-T7A - 12-bit 250kSPS 4-ch SAR ADC | Renesas
MPN: ISL26325FVZ-T7A ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.95 | $5.95 |
| 10 | $5.32 | $53.20 |
| 100 | $4.62 | $462.00 |
| 500 | $3.99 | $1,995.00 |
| 1,000 | $3.45 | $3,450.00 |
ISL26325FVZ-T7A Overview
An SAR ADC is a Nyquist-rate converter that performs a binary search on the analog input using an internal capacitive DAC and comparator. Unlike sigma-delta ADCs, SAR converters deliver a single conversion per acquisition with no pipeline latency, making them ideal for multiplexed multi-channel data-acquisition systems where deterministic latency and fast channel-to-channel settling matter. SAR parts slot into the hierarchy analog-to-digital converter -> data converter -> signal-chain IC -> mixed-signal semiconductor.
Key features of the ISL26325FVZ include ±1 LSB INL (typical), a true 12-bit no-missing-codes guarantee, a serial SPI-/QSPI-/MICROWIRE-compatible interface, and a proprietary input multiplexer with integrated input buffer amplifier that reduces the external driver requirements. The part accepts single-ended inputs in the range 0 V to AVDD and differential inputs in the range -AVDD to +AVDD, supporting bipolar signal swings around a common-mode voltage.
Typical applications span industrial process control, multi-loop programmable logic controllers (PLC) analog front ends, portable instrumentation, battery-powered sensor hubs, 4-wire RTD / thermocouple digitizers, and general-purpose data-acquisition cards. The wide supply range, low power, and small TSSOP-16 footprint also make the device attractive in compact embedded designs where board area and quiescent current are at a premium.
When designing with the ISL26325FVZ, choose the analog input capacitor and external reference capacitor per the application note recommendations for AC performance, place the AVSS and DGND ground returns on a low-impedance ground plane, and verify the SCLK idle level matches the chosen SPI mode (CPOL/CPHA) of the host microcontroller. Decouple AVDD and DVDD with separate 10 µF + 0.1 µF pairs to keep digital switching transients out of the analog reference.
This page synthesizes distributor pricing (as of 2026-10-13), drop-in alternatives, comparison parameters, and design notes not collated in the manufacturer datasheet alone, giving engineers a single reference for sourcing and second-sourcing decisions on the ISL26325 family.
Drop-in alternatives for ISL26325FVZ-T7A — 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 ISL26325FVZ-T7A (same form factor and footprint) — differing in Number of Input Channels, Package, Input Type, Operating Temperature Range, Sample Rate.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ISL26325FVZ
✅ Drop-In✓ In Stock
$3.1 / Unit
View Datasheet →ISL26320FBZ-T7A
✅ Drop-In✓ In Stock
$3.45 / Unit
View Datasheet →ISL26315FVZ-T7A
✅ Drop-In✓ In Stock
$2.52 / Unit
View Datasheet →ISL26312FVZ-T
✅ Drop-In✓ In Stock
$1.02 / Unit
View Datasheet →ISL26311FBZ
✅ Drop-In✓ In Stock
$2.3 / Unit
View Datasheet →ADS7822PG4
✅ Drop-In✓ In Stock
$3.2 / Unit
View Datasheet →ISL26325FVZ-T7A Maximum Ratings & Electrical Characteristics
| Resolution | 12 bit |
| Sample Rate | 250 kSPS |
| Architecture | SAR (Successive Approximation Register) |
| Number of Input Channels | 4 (single-ended or differential) |
| Input Type | Single-Ended and Differential |
| Analog Supply Voltage (AVDD) | 2.7 V to 5.5 V |
| Digital Supply Voltage (DVDD) | 2.7 V to 5.5 V |
| Analog Input Range (single-ended) | 0 V to AVDD |
| Analog Input Range (differential) | -AVDD to +AVDD |
| Reference Voltage | External, up to AVDD |
| Interface | Serial SPI / QSPI / MICROWIRE-compatible |
| INL (typical) | ±1 LSB |
| Supply Current at 250 kSPS | 1.9 mA (typical) |
| Power-Down Current | Few hundred nA (typical) |
| Operating Temperature | -40 °C to +125 °C |
| Package | 16-pin TSSOP |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lead-Free | Yes |
ISL26325FVZ-T7A Pin Configuration
| Pin 1 | AIN0/REF+ — Analog input 0 / external reference positive |
| Pin 2 | AIN1 — Analog input 1 |
| Pin 3 | AIN2 — Analog input 2 |
| Pin 4 | AIN3 — Analog input 3 |
| Pin 5 | AVSS — Analog ground |
| Pin 6 | REF- — External reference negative (connect to AVSS if unused) |
| Pin 7 | AVDD — Analog supply voltage (2.7 V to 5.5 V) |
| Pin 8 | DVDD — Digital supply voltage (2.7 V to 5.5 V) |
| Pin 9 | DGND — Digital ground |
| Pin 10 | CS — Chip select (active low) |
| Pin 11 | SCLK — Serial clock input |
| Pin 12 | SDOUT — Serial data output |
| Pin 13 | SDIN — Serial data input |
| Pin 14 | PD — Power-down input (active high) |
| Pin 15 | NC — Not connected (per datasheet) |
| Pin 16 | NC — Not connected (per datasheet) |
Typical Applications
ISL26325FVZ-T7A is suitable for 6 applications: Industrial Process Control & PLC Analog Front End, Battery-Powered Portable Instrumentation, Multi-Channel Temperature Sensor Digitizer (RTD / Thermocouple), General-Purpose Data Acquisition Card (USB / Ethernet DAQ), Programmable Logic Controller (PLC) Digital Input Module, Embedded Sensor Hub / IoT Edge Node.
Industrial Process Control & PLC Analog Front End
The ISL26325FVZ-T7A fits industrial process-control analog front ends thanks to its 4 single-ended or differential inputs (matching 4-20 mA loop conditioner outputs), 12-bit resolution with ±1 LSB INL, and 250 kSPS throughput that over-samples slow plant variables. The TSSOP-16 footprint drops onto a PLC analog-input card, where the SPI interface streams conversions to the host MCU without bus contention. Wide 2.7-5.5 V supply tolerates 24 V loop-derived rails after regulation, and the -40 to +125 °C rating covers cabinet environments. The internal input buffer reduces the need for external op-amp drivers, cutting BOM cost on multi-channel PLC designs where each saved amplifier multiplies across many channels.
Recommended
Battery-Powered Portable Instrumentation
The ISL26325FVZ-T7A's 1.9 mA typical operating current and nanoamp-level power-down current make it well-suited for handheld multimeters, portable data loggers, and field instruments that duty-cycle between conversions. A single Li-ion cell (nominally 3.7 V) sits inside the 2.7-5.5 V supply window without boost conversion, simplifying the power tree. The 4-channel input directly digitizes multiple sensors (temperature, pressure, voltage) in one IC, reducing board area. SPI/QSPI/MICROWIRE compatibility connects directly to low-power MCUs without glue logic, and the TSSOP-16 package keeps the analog section small enough for pen-style form factors.
Recommended
Multi-Channel Temperature Sensor Digitizer (RTD / Thermocouple)
The ISL26325FVZ-T7A's 4 differential inputs and ±AVDD common-mode range naturally accept thermocouple and 4-wire RTD bridge signals after low-noise instrumentation-amp conditioning. Its 12-bit resolution (4096 codes) gives ~0.024 % full-scale resolution, adequate for K-type thermocouple digitization over -200 to +1372 °C after linearization. The 250 kSPS throughput lets the host MCU cycle through all 4 channels in well under 1 ms, supporting fast over-temperature protection loops. Low integral nonlinearity (±1 LSB) keeps calibration error minimal across the operating range, which is critical for IEC 60730 functional-safety temperature monitoring.
Recommended
General-Purpose Data Acquisition Card (USB / Ethernet DAQ)
The ISL26325FVZ-T7A's 250 kSPS aggregate sample rate suits cost-optimized 4-channel DAQ cards targeting 100 kSPS-per-channel effective rates for vibration, strain-gauge, and analog-frontend digitization. Its SAR architecture provides deterministic single-conversion latency - essential for triggered acquisition and time-correlated measurements - unlike sigma-delta ADCs with their group-delay. Differential inputs reject common-mode noise picked up on long sensor cables. The SPI interface bridges to FPGA or MCU DAQ controllers, and the TSSOP-16 footprint allows 8-channel DAQ cards to pair two ISL26325s on a single board for 8 simultaneous inputs without exotic multiplexing.
Recommended
Programmable Logic Controller (PLC) Digital Input Module
The ISL26325FVZ-T7A's 4-channel multiplexer and integrated input buffer are an effective fit for PLC mixed-signal I/O modules that must digitize 0-10 V analog inputs alongside digital I/O. SAR single-shot conversion avoids the latency of oversampling-and-decimate converters, allowing fast loop-response times for closed-loop valve control. Industrial temperature grade (-40 to +125 °C) tolerates cabinet environments without derating. Differential input capability rejects ground potential differences between PLC chassis and remote sensor grounds, and the 5 V supply tolerance is compatible with the 24 V backplane after local regulation.
Recommended
Embedded Sensor Hub / IoT Edge Node
The ISL26325FVZ-T7A fits IoT edge nodes that aggregate multiple analog sensors (light, gas, sound level, soil moisture) into a single low-power ADC. The 4-channel input handles four sensor types in one IC, and the nanoamp power-down current lets the MCU power-cycle the ADC between sample windows for sub-100 µA average draw. SPI/QSPI/MICROWIRE compatibility talks directly to popular IoT microcontrollers (Renesas RA, ESP32, Nordic nRF) without external logic. Operating from a single 3.3 V rail simplifies power design for battery or energy-harvesting edge nodes. The 12-bit resolution is sufficient for most environmental sensor reporting where 1 % absolute accuracy is acceptable.
Recommended
Recommended Products Summary
Engineering reference data for ISL26325FVZ-T7A — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ISL26325FVZ | ISL26320FBZ-T7A | ISL26315FVZ-T7A | ISL26312FVZ-T | ISL26311FBZ | ADS7822PG4 |
|---|---|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Texas Instruments |
| Package | 16-TSSOP | 16-TSSOP - same | 16-TSSOP - same | 16-TSSOP - same | 16-TSSOP - same | 16-TSSOP - same | 16-TSSOP - same |
| Interface | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI | SPI | SPI | SPI/QSPI/MICROWIRE |
| Architecture | SAR | SAR | SAR | SAR | SAR | SAR | SAR |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +85 °C (typical) | -40 °C to +85 °C (typical) | -40 °C to +85 °C (typical) | -40 °C to +85 °C |
Key Differentiators
- Integrated 4-channel input multiplexer with input buffer amplifier (vs ISL26320FBZ-T7A)
- Wide 2.7 V to 5.5 V supply range supports both 3.3 V and 5 V rails (vs ADS7822PG4 (TI))
- No-missing-codes 12-bit performance with ±1 LSB INL typical (vs Generic TSSOP-16 SAR ADCs)
Design Notes
Decouple AVDD and DVDD with separate 10 µF bulk + 0.1 µF ceramic pairs placed within 5 mm of the supply pins. Tie AVDD and DVDD together at a single point near the IC when running from one 3.3 V rail; route star-ground back to the regulator. The internal analog and digital grounds (AVSS, DGND) should be joined at one low-impedance copper pour beneath the IC to prevent digital switching currents from corrupting the analog reference.
Place the external reference decoupling capacitor (typically 10 µF tantalum + 0.1 µF ceramic in parallel) directly between the REF+/REF- pins with traces short and wide. Keep digital lines (CS, SCLK, SDOUT, SDIN) routed away from the analog input traces and AVDD/REF planes. Use a guard ring around the analog inputs tied to AVSS to absorb stray leakage currents from the TSSOP-16 package, particularly in high-impedance sensor applications.
Verify the SPI mode (CPOL/CPHA) of the host MCU matches the ISL26325FVZ-T7A timing diagram in the datasheet - mismatched modes cause the SDOUT data to appear shifted or stuck. Ensure CS idle-high between conversions and provide adequate tSU_CSS setup time before the first SCLK rising edge. Do not exceed the AVDD absolute maximum (6 V) during transient events; place a TVS or Zener clamp on the analog supply if the input is hot-pluggable.
For best AC performance (SNR, THD), drive the analog inputs from a low-impedance source (<100 Ω) through a short PCB trace, since the internal buffer amplifier reduces but does not eliminate input drive requirements. In multi-channel scanning applications, add 10 kHz or higher anti-aliasing RC filters ahead of the analog inputs to suppress out-of-band noise that would otherwise alias into the conversion bandwidth. Avoid switching digital lines adjacent to the analog inputs during the acquisition window (tACQ) to prevent kickback coupling.
Compliance Information
RoHS and lead-free per Renesas product page. Not AEC-Q100 qualified (consumer/industrial grade). MSL level not stated in retrieved web data - see datasheet for floor-life.