Analog Devices Inc./Maxim Integrated MAX305CPE+

Overview

The MAX305CPE+ from Maxim Integrated is a precision dual SPST analog switch with normally open (NO) configuration, designed for high-accuracy signal routing in bipolar or single-supply systems. It delivers <35Ω max on-resistance, <2Ω channel-to-channel match, <15pC charge injection, rail-to-rail analog signal handling (V− to V+), and operates from ±4.5V to ±20V or +10V to +30V supplies - ideal for test equipment and military radio front-ends.

For engineers reviewing the MAX305CPE+ datasheet, MAX305CPE+ pinout, MAX305CPE+ application, or MAX305CPE+ equivalent, key selection criteria include guaranteed on-resistance flatness (≤5Ω ΔRON over full signal range), low +85°C off-leakage (<6nA), fast switching (tON < 150ns, tOFF < 100ns), and compatibility with TTL/CMOS logic inputs at VL = +5V.

Technical Context

The MAX305CPE+ implements a monolithic silicon-gate CMOS architecture optimized for precision analog switching. Its dual SPST topology isolates two independent NO paths, each controlled by separate digital inputs (IN1/IN2), with COM1/COM2 as common drains and NO1/NO2 as source terminals - enabling discrete signal gating without break-before-make timing constraints.

All channels share a common substrate tied to V+, ensuring stable threshold behavior across temperature. The device guarantees matched on-resistance (≤2Ω mismatch at +25°C) and flat RON (≤5Ω variation over VCOM = V− to V+) due to process-matched transistor pairs and symmetrical layout - critical for instrumentation-grade multiplexing and sample-and-hold accuracy.

Key Specifications

Pinout & Package

MAX305CPE+ is housed in a 16-pin plastic DIP (P16-1) package with 0.3-inch width, through-hole mounting, and industry-standard pin spacing. Pin functions are validated per Maxim's official pin description table and top-view diagram for MAX305 DIP/SO variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX305CPE+, ADG1419BRUZ offers superior on-resistance but sacrifices guaranteed channel matching and high-temperature leakage performance, while TS5A23157DGSR trades voltage range and leakage for footprint and cost - making MAX305CPE+ the optimal choice for precision, wide-supply, thermally robust analog routing.

Availability

MAX305CPE+ is available at Aetrix Electronics and suitable for test equipment signal routing, military radio front-end switching, and sample-and-hold circuit sampling requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX305CPE+ 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

Maxim Integrated (now part of Analog Devices) designs high-performance analog and mixed-signal ICs for industrial, automotive, and communications markets, with emphasis on precision, reliability, and integration.

The MAX301/MAX303/MAX305 family was engineered specifically for high-accuracy analog signal switching in demanding environments - delivering guaranteed matching, low charge injection, and rail-to-rail operation where measurement fidelity is non-negotiable.

FAQ

What is the maximum allowable supply voltage for MAX305CPE+?

The MAX305CPE+ has an absolute maximum V+ to V− rating of 44V. It operates safely across ±4.5V to ±20V bipolar supplies or +10V to +30V single supplies. Exceeding these limits risks permanent damage due to internal diode clamp activation or substrate breakdown - always observe recommended power sequencing (V+ first, then VL, V−, and logic inputs).

Does MAX305CPE+ support rail-to-rail analog signal switching?

Yes, MAX305CPE+ supports rail-to-rail analog signal switching from V− to V+. This is enabled by its improved silicon-gate process and internal protection structures, allowing full utilization of the supply rails - for example, ±15V analog signals pass through with no clipping or distortion when V+ = +15V and V− = −15V.

What is the guaranteed on-resistance match between channels for MAX305CPE+?

MAX305CPE+ guarantees on-resistance match of ≤2Ω between its two SPST switches at +25°C, and ≤3Ω over the full operating temperature range (0°C to +70°C). This specification is measured under identical conditions (V+ = 15V, V− = −15V, VCOM = ±10V) and ensures predictable gain consistency in differential or ratiometric signal paths.

Can MAX305CPE+ operate with TTL-level logic inputs?

Yes, MAX305CPE+ accepts TTL-level logic inputs when VL is tied to +5V. Under this condition, VINH ≥ +2.4V and VINL ≤ +0.8V meet standard TTL thresholds, and input current remains <±1µA - minimizing loading on legacy logic families. If VL connects to V+, CMOS-level thresholds apply instead.

What is the charge injection specification for MAX305CPE+ and why does it matter?

MAX305CPE+ guarantees charge injection ≤15pC. This parameter quantifies the net charge dumped onto the switched node during turn-on/turn-off transitions. In sample-and-hold or integrator circuits, excessive charge injection causes voltage glitches and settling errors - 15pC ensures <1LSB error in 16-bit systems using 10nF hold capacitors.