Renesas ISL8391IBZ

Overview

ISL8391IBZ from Intersil is a low-voltage, quad SPST analog switch with normally closed (NC) configuration, designed for precision signal routing in battery-powered and portable systems. It operates from single +2V to +12V or dual ±2V to ±6V supplies, delivers 20Ω typical R_ON at ±5V, 60ns t_ON, and 2.5nA max leakage at 85°C - enabling high-fidelity audio switching and low-power medical sensor multiplexing.

For engineers reviewing the ISL8391IBZ datasheet, ISL8391IBZ pinout, ISL8391IBZ application, or ISL8391IBZ equivalent, this page provides verified electrical specs, SOIC-16 pin mapping, real-world use cases in handheld diagnostics and RF tee switching, and two validated alternative parts with documented functional and parametric differences.

Technical Context

The ISL8391IBZ implements four independent CMOS SPST switches with NC topology, each controlled by a TTL/CMOS-compatible digital input. Its internal level-shifting circuitry ensures proper gate drive across supply ranges, making R_ON and switching speed strongly dependent on both V+ and V− rails.

It features bidirectional analog signal handling (0V to V+ or V− to V+), ESD protection (>2kV per MIL-STD-883 Method 3015), and no internal connection to GND in the analog path - preserving signal integrity in isolated or floating systems.

Key Specifications

Pinout & Package

ISL8391IBZ is housed in a 16-lead narrow-body SOIC (M16.15), Pb-free, with 1.27mm pitch and JEDEC MS-012-AC compliance. Thermal resistance θ_JA is 115°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX391CPE+ and ADG1411BRUZ, the ISL8391IBZ offers the widest supply range (down to +2V), best leakage performance at temperature, and Pb-free SOIC packaging - making it optimal for new portable designs requiring long battery life and regulatory compliance.

Availability

ISL8391IBZ is available at Aetrix Electronics and suitable for portable medical devices, RF communication modules, laptop audio subsystems, and industrial data acquisition systems requiring stable component supply across extended temperature and lifecycle requirements.

Supply support for ISL8391IBZ 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, now part of Renesas Electronics, designs high-performance analog and mixed-signal ICs for power management, precision analog, and interface applications.

The ISL8391IBZ belongs to Intersil's low-voltage analog switch family, engineered for ultra-low power, high isolation, and rail-to-rail signal handling in battery-operated and space-constrained systems.

FAQ

What is the maximum supply voltage rating for the ISL8391IBZ?

The ISL8391IBZ has an absolute maximum V+ to V− rating of 15V, with recommended operating range of ±2V to ±6V (bipolar) or +2V to +12V (single supply). Exceeding ±6V or +12V risks permanent damage, even briefly. The 15V margin accommodates 10% tolerance on 12V supplies and transient spikes, as confirmed in Absolute Maximum Ratings on page 3 of FN6039 Rev.2.00.

Does the ISL8391IBZ support single-supply operation with V− tied to GND?

Yes, the ISL8391IBZ fully supports single-supply operation: connect V− to GND, apply V+ between +2V and +12V, and route analog signals from 0V to V+. Pin descriptions on page 2 confirm V− is "connect to GND for single supply configurations", and Electrical Specifications on pages 4–5 include dedicated 5V and 3.3V test conditions with V− = GND.

What is the guaranteed R_ON matching between channels for the ISL8391IBZ?

The ISL8391IBZ guarantees ΔR_ON ≤ 4Ω across all four channels at full temperature range (−40°C to +85°C) under ±5V supply, as specified in Table 1 and Electrical Specifications (page 3). At 25°C and ±5V, matching is tighter: ≤2Ω max. This ensures minimal gain mismatch in multi-channel instrumentation using ISL8391IBZ as a synchronous multiplexer.

How does the ISL8391IBZ achieve low leakage current at elevated temperatures?

The ISL8391IBZ achieves ≤2.5nA max leakage at 85°C via optimized CMOS process design and ESD diode biasing - all analog leakage flows between signal pins and V+/V− rails (not GND), minimizing thermal drift. Leakage is 100% tested at high temperature and correlated to 25°C values, as noted in footnote 7 on page 3 of FN6039 Rev.2.00.

Is the ISL8391IBZ pin-compatible with the MAX391 series?

Yes, the ISL8391IBZ is explicitly stated as a pin-compatible replacement for MAX391–MAX393 in the Features section (page 1) and Table 1 (page 1) of FN6039 Rev.2.00. Both share identical 16-pin SOIC pinout, NC configuration, and logic polarity - enabling drop-in substitution in existing layouts without redesign, provided supply and signal voltage constraints are met.