Analog Devices Inc./Maxim Integrated MAX351CPE

Overview

MAX351CPE from Maxim Integrated is a precision quad SPST analog switch with four normally closed (NC) channels, fabricated using a 44V silicon-gate process. It delivers low on-resistance (≤35Ω), matched within 2Ω between channels, flat on-resistance (∆3Ω max), <10pC charge injection, and rail-to-rail analog signal handling up to ±15.5V. It operates from single (+10V to +30V) or split (±4.5V to ±20V) supplies and is used in military radios and guidance systems requiring high channel matching and low leakage.

For engineers reviewing the MAX351CPE datasheet, MAX351CPE pinout, MAX351CPE application, or MAX351CPE equivalent, key selection criteria include guaranteed on-resistance matching across temperature, sub-6nA off-leakage at +85°C, CMOS/TTL logic compatibility, and 16-pin plastic DIP packaging for through-hole prototyping and ruggedized designs.

Technical Context

The MAX351CPE implements four independent SPST switches with NC configuration, each controlled by a dedicated CMOS-compatible logic input. Its 44V breakdown voltage enables full rail-to-rail analog signal switching without clamping under ±15V operation, and its matched on-resistance ensures consistent gain/attenuation across channels in multiplexer or sample-and-hold topologies.

Charge injection is tightly controlled at ≤10pC, minimizing transient errors in precision sampling applications. The device supports dual-supply operation with separate VL (logic supply) and V+/V− (analog supply) rails, allowing TTL-level control while maintaining wide analog swing - critical for battery-operated test equipment and avionics interfaces.

Key Specifications

Pinout & Package

MAX351CPE is housed in a 16-pin plastic DIP package (0.300" width), suitable for through-hole mounting and legacy industrial PCBs. Pin spacing follows standard 0.1" grid; substrate tied to V+.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX351CPE, MAX352CPE offers identical performance in a complementary NO configuration ideal for safety-critical disconnects, while ADG441BNZ trades lower cost and wider temperature range for higher on-resistance and lack of through-hole packaging - making MAX351CPE optimal for ruggedized, NC-default, DIP-based designs.

Availability

MAX351CPE is available at Aetrix Electronics and suitable for military radios, guidance and control systems, and sample-and-hold circuits requiring stable component supply, long-term obsolescence management, and traceable sourcing for defense and aerospace programs.

Supply support for MAX351CPE 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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.

The MAX351/MAX352/MAX353 family was designed specifically for precision analog signal routing in demanding environments - emphasizing channel matching, low charge injection, and rail-to-rail operation for military, avionics, and test equipment applications.

FAQ

What is the maximum analog signal voltage supported by the MAX351CPE?

The MAX351CPE supports analog signals from V− to V+, with absolute maximum ratings of ±15.5V relative to V− when V+ = +16.5V and V− = −16.5V. Its 44V breakdown voltage enables true rail-to-rail operation - for example, ±15V supplies allow ±15.5V signal swing without clipping or diode conduction, critical for high-fidelity instrumentation.

How does the MAX351CPE differ from the MAX352CPE?

The MAX351CPE features four normally closed (NC) SPST switches, while the MAX352CPE provides four normally open (NO) switches - identical in all electrical specifications (on-resistance, leakage, charge injection, etc.). The functional difference lies solely in default state: MAX351CPE connects COM to NC when logic input is low, whereas MAX352CPE connects COM to NO when input is high.

Can the MAX351CPE operate from a single +12V supply?

Yes, the MAX351CPE supports single-supply operation from +10V to +30V. When using +12V, connect V− to GND, set VL to +5V for TTL compatibility, and ensure analog signals remain within 0V to +12V. On-resistance increases slightly versus ±15V operation, but turn-on time remains ≤175ns and leakage stays below 250pA at +25°C.

What is the purpose of the VL pin on the MAX351CPE?

The VL pin sets the logic threshold voltage for the IN1–IN4 inputs. Tie VL to +5V for TTL-compatible operation (VIH ≥ 2.4V, VIL ≤ 0.8V); tie it to V+ for CMOS-compatible thresholds (VIH ≥ 0.7×V+, VIL ≤ 0.3×V+). This flexibility allows seamless integration with both legacy 5V logic and modern high-voltage microcontrollers without level shifters.

Is the MAX351CPE suitable for use in sample-and-hold circuits?

Yes, the MAX351CPE is explicitly optimized for sample-and-hold applications due to its guaranteed ≤10pC charge injection, low on-resistance flatness (∆3Ω max), and fast switching (t_ON < 175ns). These characteristics minimize droop, aperture error, and settling time - enabling accurate acquisition of signals up to 100kHz bandwidth in precision data acquisition systems.