ISL26320FBZ-T7A - 12-bit 250kSPS 1-Ch SAR ADC | Renesas
MPN: ISL26320FBZ-T7A ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.9 | $6.90 |
| 10 | $6.1 | $61.00 |
| 100 | $5.2 | $520.00 |
| 500 | $4.4 | $2,200.00 |
| 1,000 | $3.85 | $3,850.00 |
| 2,500 | $3.45 | $8,625.00 |
ISL26320FBZ-T7A Overview
A SAR ADC is a type of analog-to-digital converter that uses a binary search algorithm to determine each bit of the conversion result. SAR ADCs are prized for low power consumption, zero-latency single-shot conversions, and excellent DC linearity. They sit beneath the broader ADC hierarchy (SAR -> Nyquist ADC -> data converter -> mixed-signal IC), sharing the family with delta-sigma, pipeline, and flash architectures. SAR converters typically dominate applications in the 8- to 16-bit range and 100 kSPS to 1 MSPS throughput band - exactly the niche the ISL26320 family targets.
Key specifications include 12-bit resolution, 250 kSPS maximum sample rate, low single-ended and differential input support, and an integrated input multiplexer plus combination buffer amplifier that lowers the external drive requirement. The proprietary input stage simplifies the signal chain, reducing overall BOM cost and PCB area in multi-channel and battery-powered designs.
The device belongs to the ISL26320/21/22/23/24/25/29 pin-compatible family from Renesas, which scales channel count and sample rate across the portfolio. The ISL26320 is the 1-channel, 250 kSPS entry point. It uses a bipolar CMOS process variant with trimmed thin-film resistors, achieving excellent linearity over the rated -40 °C to +85 °C industrial temperature range.
Typical applications include industrial process control, portable instrumentation, battery-powered data loggers, sensor signal conditioning, and multi-channel data-acquisition front-ends where low power and small footprint matter. Its single 5 V supply operation suits industrial 24 V bus systems after front-end regulation.
When designing in this ADC, decouple AVDD and DVDD separately with 0.1 µF ceramic capacitors close to the pins, and provide a clean low-impedance reference. Place the analog and digital grounds on split planes joined under the ADC. Note that the wider ISL2632x family footprint remains pin-compatible across channel-count variants, simplifying PCB scaling.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet alone, helping engineers select and source this Renesas SAR ADC efficiently.
Drop-in alternatives for ISL26320FBZ-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 ISL26320FBZ-T7A (same form factor and footprint) — differing in Package, Number of Input Channels, Interface, Input Type, Operating Temperature Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ISL26310FBZ-T7A
✅ Drop-In✓ In Stock
$3.79 / Unit
View Datasheet →ISL26321FBZ
✅ Drop-In📋 Reference alternative (not in catalog)
ISL26320FBZ
✅ Drop-In📋 Reference alternative (not in catalog)
ISL26320FBZ-T
✅ Drop-In📋 Reference alternative (not in catalog)
ISL26320FBZ-T7A Maximum Ratings & Electrical Characteristics
| Resolution | 12 bit |
| Sample Rate | 250 kSPS |
| Number of Input Channels | 1 |
| Input Configuration | Single-ended and Differential |
| Architecture | SAR (Successive Approximation Register) |
| Converter Type | Single ADC |
| Supply Voltage Range (Analog) | 2.7 V to 5.25 V |
| Interface | Serial (SPI/QSPI/MICROWIRE-compatible) |
| Package | 8-pin SOIC N (FBZ) |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel (7-inch / 178 mm, T7A) |
| Operating Temperature Range | -40 °C to +85 °C (industrial) |
| Input Buffer | Integrated input multiplexer + buffer amplifier |
| Data Output Format | Serial, 12-bit |
| RoHS Status | Compliant |
| HTS / Export Code | 8542390000 |
| Manufacturer | Renesas (formerly Intersil) |
ISL26320FBZ-T7A Pin Configuration
| Pin 1 | AVDD — Analog supply voltage (2.7 V to 5.25 V) |
| Pin 2 | REF — Reference voltage input |
| Pin 3 | IN+ — Positive analog input |
| Pin 4 | IN- — Negative analog input |
| Pin 5 | GND — Ground |
| Pin 6 | SCLK — Serial clock input (SPI) |
| Pin 7 | /CS — Chip select, active low |
| Pin 8 | SDOUT — Serial data output (SPI/QSPI/MICROWIRE) |
Typical Applications
ISL26320FBZ-T7A is suitable for 6 applications: Industrial Process Control Data Acquisition, Portable Battery-Powered Instrumentation, Sensor Signal Conditioning Front-End, Multi-Channel Data-Acquisition Systems, Medical Monitoring Equipment, Test and Measurement Instrumentation.
Industrial Process Control Data Acquisition
The ISL26320FBZ-T7A's 12-bit resolution, 250 kSPS throughput, and industrial -40 °C to +85 °C temperature range make it well suited for industrial process control front-ends reading pressure, flow, or temperature transducers via 4-20 mA or voltage inputs. Its single-ended and differential input flexibility accommodates both grounded and floating sensor outputs without external instrumentation amps in many cases. Connected to a host MCU through its SPI-compatible serial interface, the ISL26320 enables multi-channel scanning when paired with channel-multiplexing firmware. Estimated: at 250 kSPS and 5 V analog supply, quiescent plus conversion current budgets stay well within portable backplane power budgets.
Recommended
Portable Battery-Powered Instrumentation
Operating from a single 2.7 V to 5.25 V supply, the ISL26320FBZ-T7A is a strong fit for battery-powered data loggers, handheld multimeters, and portable measurement devices. Its integrated input multiplexer and buffer amplifier lower the external drive requirement, reducing BOM count and PCB area - critical in compact handheld form factors. The wide supply range supports direct lithium battery or 3.3 V/5 V system rails. Combined with the ISL2632x family's low-power design discipline, it enables multi-day battery-life designs. Estimated: at 250 kSPS burst-sampling duty cycles, average power draw fits inside lithium primary-cell budgets.
Recommended
Sensor Signal Conditioning Front-End
With its true single-ended and differential input capability, the ISL26320FBZ-T7A pairs naturally with thermocouples, load cells, strain gauges, and bridge-type sensors that produce small differential outputs. The integrated input buffer reduces the need for external op-amps, supporting direct connection to many transducer outputs. In a 5 V supply environment with 12-bit (4096-code) resolution, it resolves signals down to the millivolt range when scaled to full-scale input. Designers can multiplex multiple sensors through the host MCU's GPIO chain, scaling with the larger ISL2632x family members. The serial interface keeps the host CPU overhead low.
Recommended
Multi-Channel Data-Acquisition Systems
The ISL26320FBZ-T7A acts as the 1-channel entry point to the Renesas ISL2632x pin-compatible family, supporting scalable multi-channel data-acquisition cards. By physically placing an ISL26321 or ISL26322/24/25 in the same SOIC-8 footprint when more channels are needed, designers reuse PCB layout for product variants from 1 to 8 channels. The 250 kSPS sample rate per device supports aggregate throughput approaching 1 MSPS across multiple synchronized ADCs. Each ADC's SPI interface lets the host controller address them individually via /CS lines. The -40 °C to +85 °C range supports industrial rack-mount enclosures.
Recommended
Medical Monitoring Equipment
Although not AEC-Q100 qualified, the ISL26320FBZ-T7A's 12-bit resolution and low-noise SAR architecture are useful in non-critical medical monitoring subsystems such as bench-top lab instruments and OEM electronic sub-assemblies. Its single-ended and differential inputs suit ECG, temperature, and respiration sensor signal chains when paired with appropriate isolation and front-end amplification. The wide supply range and compact SOIC-8 footprint fit portable patient-monitoring form factors. Designers must apply patient-side isolation according to IEC 60601 when integrating into any patient-contact application. Estimated: with proper input filtering, the 12-bit resolution is sufficient for non-diagnostic vitals monitoring subsystems.
Recommended
Test and Measurement Instrumentation
The ISL26320FBZ-T7A's 250 kSPS sample rate and 12-bit DC linearity suit bench-top oscilloscope-adjacent measurement instruments, data loggers, and lab-grade DAQ peripherals. Its single +5 V analog supply simplifies rack-mount power architecture, while its SPI serial output minimizes board area in compact bench instruments. The differential input path lets it capture true-differential probe or bridge outputs without external differential amps in many circuit configurations. The -40 °C to +85 °C industrial temperature rating supports chassis and rack cooling envelopes. Combined with calibration routines, the 12-bit performance delivers reliable measurement across production-test platforms.
Recommended
Recommended Products Summary
Engineering reference data for ISL26320FBZ-T7A — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ISL26310FBZ-T7A | ISL26321FBZ | ISL26320FBZ | ISL26320FBZ-T |
|---|---|---|---|---|---|
| Brand | Renesas | Renesas | Renesas | Renesas | Renesas |
| Package | 8-pin SOIC N (FBZ) | 8-pin SOIC N - same | 8-pin SOIC N - same | 8-pin SOIC N - same | 8-pin SOIC N - same |
| Resolution | 12 bit | 12 bit - same | 12 bit - same | 12 bit - same | 12 bit - same |
| Sample Rate | 250 kSPS | 125 kSPS (-50%) | 250 kSPS - same | 250 kSPS - same | 250 kSPS - same |
| Number of Channels | 1 single-ended/differential | 1 | 2 | 1 | 1 |
| Supply Voltage Range | 2.7 V to 5.25 V | 2.7 V to 5.25 V - same | 2.7 V to 5.25 V - same | 2.7 V to 5.25 V - same | 2.7 V to 5.25 V - same |
| Interface | Serial (SPI/QSPI/MICROWIRE) | Serial - same | Serial - same | Serial - same | Serial - same |
| Architecture | SAR | SAR | SAR | SAR | SAR |
| Packaging Format | Tape & Reel (7-inch / 178 mm, T7A) | Tape & Reel (T7A) | Tube (no T7A) | Tube (no T7A) | Tape & Reel (13-inch / T) |
Key Differentiators
- Single-channel 250 kSPS throughput at the SOIC-8 entry point of an 8-channel pin-compatible family (vs ISL26310FBZ-T7A)
- Same SOIC-8 family footprint as the wider ISL2632x family enables PCB reuse (vs ISL26324FBZ (4-channel variant))
- Integrated input multiplexer and buffer amplifier reduces external BOM (vs Discrete op-amp-plus-SAR architecture)
Design Notes
Decouple AVDD and DVDD with separate 0.1 µF X7R ceramic capacitors placed as close as possible to the IC pins. Estimated: at 250 kSPS with 5 V analog supply, the input mux, buffer amplifier, and successive-approximation switch network draw transient currents during sample acquisition - bulk decoupling (1-10 µF) on AVDD stabilizes the analog rail and minimizes reference kickback. Route AVDD from a low-noise regulator; do not share the digital 3.3 V/5 V rail directly with the analog supply without filtering.
Use a star-ground topology or split analog/digital ground planes joined under the ADC package. Keep analog input traces short and routed away from the SCLK, /CS, and SDOUT digital lines to avoid digital-to-analog coupling. Estimated: a 12-bit SAR loses roughly 1 LSB of dynamic range for every 1 mV of ground bounce, so careful layout is critical to preserve DC linearity. Add a ground guard ring around the IN+/IN- input nodes if high-impedance sensor sources are used.
Do not exceed the absolute maximum of 5.25 V on AVDD or DVDD - the ISL26320's internal ESD clamp and reference circuits are not rated above this. Always drive the analog inputs from a low-impedance source; the integrated buffer helps but cannot drive from >10 kΩ without noticeable gain error. Note that the wider ISL2632x family exposes channel-count variants in the same SOIC-8 footprint - double-check the pinout when migrating between ISL26320 (1-ch) and ISL26321/22/24 (multi-ch) to avoid wiring mistakes.
Compliance Information
RoHS compliant per Renesas product page. Non-automotive (no AEC-Q100). HTS code 8542390000 per distributor listings.
