Renesas ISL8325IB-T

Overview

ISL8325IB-T from Intersil is a low-voltage, single-supply dual SPST analog switch with one normally open (NO) and one normally closed (NC) channel, enabling SPDT functionality. It operates from +2.7V to +12V, delivers 60Ω max R_ON at 5V, guarantees break-before-make timing (2–10 ns), and maintains ≤5 pC charge injection - ideal for precision sample-and-hold and audio multiplexing in portable instrumentation.

For engineers reviewing the ISL8325IB-T datasheet, ISL8325IB-T pinout, ISL8325IB-T application, or ISL8325IB-T equivalent, key selection criteria include guaranteed break-before-make operation, sub-100nA leakage at 85°C, SOIC-8 package compatibility, and TTL/CMOS logic interface robustness across 3.3V–12V supply rails.

Technical Context

The ISL8325IB-T implements two independent CMOS transmission gates driven by level-shifted digital inputs, with internal ESD diodes clamping analog pins to V+ and GND. Its break-before-make behavior is hardwired and guaranteed across temperature (–40°C to +85°C), eliminating cross-conduction risk during channel switching.

Signal integrity is preserved via matched R_ON (≤2 Ω max mismatch at 5V), flat R_ON (≤8 Ω variation over input range), and high off-isolation (72 dB at 1 MHz). All analog paths remain within 0–V+ signal range, with no bipolar supply support.

Key Specifications

Pinout & Package

ISL8325IB-T is housed in an 8-lead narrow-body SOIC (M8.15) package, 3.9 mm × 4.9 mm footprint, 1.27 mm lead pitch, with gull-wing leads and Pb-free matte tin terminations.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual SPST analog switch applications.

Compared with MAX325ESE+, ISL8325IB-T extends supply range to 12V and guarantees break-before-make, critical for unattended SPDT routing; versus TMUX6219RTER, it offers SOIC-8 compatibility and lower quiescent power (<5 µW), better suited for long-life battery designs despite higher R_ON.

Availability

ISL8325IB-T is available at Aetrix Electronics and suitable for portable instrumentation, medical diagnostics, and industrial sensor interface applications requiring stable component supply and legacy design continuity.

Supply support for ISL8325IB-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Intersil Corporation is a precision analog and power management semiconductor provider, now part of Renesas Electronics, with expertise in high-reliability industrial and medical signal conditioning ICs.

The ISL832x family was designed specifically for low-power, single-supply analog switching in battery-operated equipment - emphasizing leakage control, supply flexibility, and signal fidelity over wide voltage and temperature ranges.

FAQ

What is the maximum supply voltage rating for ISL8325IB-T?

The ISL8325IB-T has an absolute maximum supply voltage of 15 V, with recommended operation from +2.7 V to +12 V. This headroom accommodates 10% tolerance on 12 V rails and transient spikes. Exceeding 15 V risks permanent damage due to internal ESD diode conduction, as confirmed in the Absolute Maximum Ratings table on page 3 of FN6023 Rev 2.00.

Does ISL8325IB-T support true SPDT operation out of the box?

Yes - the ISL8325IB-T integrates one normally open (NO1) and one normally closed (NC2) switch sharing COM1 and COM2, respectively, enabling hardware-based SPDT functionality without external components. Its guaranteed break-before-make timing (2–10 ns) ensures no overlap between channel conduction states, as specified in the Electrical Specifications table on page 3.

What is the leakage current specification for ISL8325IB-T at 85°C?

The ISL8325IB-T guarantees ≤5 nA maximum leakage current (NO/OFF, NC/OFF, and COM/OFF) at 85°C, as tested per Note 8 on page 4 of FN6023 Rev 2.00. This value applies across full analog signal range (0 V to V+) and is validated at high temperature with correlation to 25°C performance.

Can ISL8325IB-T operate from a 3.3V supply, and how does performance change?

Yes - ISL8325IB-T operates from +3.0 V to +3.6 V. At 3.3 V, R_ON increases to 175 Ω max (vs. 60 Ω at 5 V), and switching times rise to 400 ns t_ON/125 ns t_OFF. These trade-offs are documented in the 3.3V Electrical Specifications table on page 4 and reflect inherent CMOS channel resistance scaling with supply voltage.

Is ISL8325IB-T pin-compatible with other devices in the ISL832x family?

Yes - ISL8325IB-T shares identical SOIC-8 pinout and footprint with ISL8323IBZ and ISL8324IBZ, as shown in the Pinouts section (page 2) and Package Outline Drawing M8.15 (page 11). However, logic polarity differs: ISL8323 uses dual NO, ISL8324 dual NC, while ISL8325 combines NO/NC for SPDT, requiring firmware or schematic adaptation despite mechanical compatibility.