Renesas ISL8325IBZ

Overview

ISL8325IBZ from Intersil is a dual SPST analog switch with one normally open (NO) and one normally closed (NC) channel, enabling SPDT functionality in a single 8-lead SOIC package. It operates from +2.7V to +12V, delivers ≤60Ω on-resistance at 5V, ≤150ns turn-on time, and guarantees break-before-make switching-ideal for precision signal routing in portable medical and communications equipment.

For engineers reviewing the ISL8325IBZ datasheet, ISL8325IBZ pinout, ISL8325IBZ application, or ISL8325IBZ equivalent, key selection criteria include guaranteed break-before-make timing (2–10 ns), low 5pC charge injection, sub-5nA leakage at 85°C, and TTL/CMOS compatibility across full supply range.

Technical Context

The ISL8325IBZ implements a CMOS-based dual SPST architecture with independent digital control inputs (IN1, IN2) driving complementary NO/NC switch pairs. Its internal level shifters translate TTL/CMOS logic (0.8V/2.4V thresholds) to full-rail analog gate drive, ensuring reliable switching across 2.7V–12V supplies.

Break-before-make operation is hardware-guaranteed via internal timing control-not software-configurable-ensuring no signal shorting during channel transitions. All analog pins feature ESD protection diodes to V+ and GND, limiting input voltage to within ±0.3V of rails and requiring proper supply sequencing to avoid forward biasing.

Key Specifications

Pinout & Package

ISL8325IBZ is housed in an 8-lead narrow-body SOIC package (JEDEC MS-012-AA, outline M8.15), measuring 4.90 mm × 3.90 mm × 1.75 mm, with 1.27 mm lead pitch 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 ISL8325IBZ, MAX325EPA+ offers seamless mechanical and functional compatibility with minor R_ON trade-off, while TMUX6219RTER delivers superior analog performance in a smaller package but removes hardware-enforced break-before-make-shifting timing assurance to firmware or external logic.

Availability

ISL8325IBZ is available at Aetrix Electronics and suitable for portable medical devices, battery-powered test equipment, and industrial DAC/ADC signal routing requiring stable component supply and long-term lifecycle support.

Supply support for ISL8325IBZ 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-grade components.

The ISL832x family was designed specifically for low-power, high-fidelity analog signal switching in portable and battery-critical applications-emphasizing low leakage, fast switching, and single-supply simplicity.

FAQ

What is the guaranteed break-before-make timing specification for ISL8325IBZ?

The ISL8325IBZ guarantees a hardware-enforced break-before-make delay of 2 ns minimum to 10 ns maximum between its NO1 and NC2 paths during channel transitions. This parameter is measured under RL = 300Ω, CL = 35pF, and VNO/VNC = 3V conditions, and is intrinsic to the device's internal timing circuitry-not dependent on external layout or control signals. The ISL8325IBZ is the only member of the ISL832x family with this guaranteed feature.

Can ISL8325IBZ operate from a 3.3V supply, and how does performance change versus 5V?

Yes, ISL8325IBZ operates from +3.0V to +3.6V. At 3.3V, R_ON increases to ≤175Ω (vs. ≤60Ω at 5V), t_ON/t_OFF degrade to ≤400ns/≤125ns (vs. ≤150ns/≤100ns), and charge injection remains ≤5pC. These shifts reflect inherent CMOS switch physics-lower V_GS reduces channel conductivity and switching speed-but all parameters remain fully specified and tested across temperature.

Does ISL8325IBZ require external protection diodes when interfacing with signals exceeding V+ or GND?

No external protection diodes are required if V+ is powered before applying analog or digital signals and all inputs remain within –0.3V to (V+ + 0.3V). The ISL8325IBZ integrates ESD diodes from every analog pin (NO1, NC2, COM1, COM2) to V+ and GND. However, if overvoltage risk exists, a 1kΩ series resistor on digital inputs limits current safely without degrading analog performance.

What is the maximum analog signal voltage range supported by ISL8325IBZ?

The ISL8325IBZ supports an analog signal range from 0V to V+, meaning the full rail-to-rail span of the positive supply. For example, with V+ = 5V, signals from 0V to 5V are fully passed with minimal distortion. This range holds across the entire operating temperature range (–40°C to +85°C) and supply range (+2.7V to +12V), as confirmed in the Absolute Maximum Ratings and Electrical Specifications tables of the FN6023 datasheet.

Is ISL8325IBZ pin-compatible with other members of the ISL832x family, and what are the functional differences?

Yes, ISL8325IBZ shares identical 8-lead SOIC packaging and pinout with ISL8323IBZ (dual NO) and ISL8324IBZ (dual NC), including V+, GND, IN1, IN2, COM1, COM2, NO1, and NC2. Functionally, ISL8325IBZ uniquely combines one NO and one NC switch to enable true SPDT behavior with guaranteed break-before-make, whereas ISL8323IBZ and ISL8324IBZ provide only dual-NO or dual-NC configurations without transition timing control.