Analog Devices Inc./Maxim Integrated MAX385CSE+

Overview

MAX385CSE+ from Maxim Integrated is a precision dual-pole single-throw (DPST) analog switch with normally open configuration, designed for low-voltage signal routing in battery-powered and precision instrumentation systems. It delivers 20Ω typical on-resistance (35Ω max), <2Ω matched R_ON between channels, <5pC charge injection, and operates from +3V to +15V single supply or ±3V to ±8V dual supplies - enabling rail-to-rail analog signal handling in audio routing and test equipment.

For engineers reviewing the MAX385CSE+ datasheet, MAX385CSE+ pinout, MAX385CSE+ application, or MAX385CSE+ equivalent, this page provides verified technical context, real-world switching performance data, package-specific layout guidance, and validated alternative options for precision analog multiplexing and signal path control.

Technical Context

The MAX385CSE+ integrates two independent SPST switches in a single monolithic silicon-gate CMOS process, each controlled by separate logic inputs (IN1 controls COM1/COM3; IN2 controls COM2/COM4). Its architecture guarantees flat on-resistance (<4Ω variation) across the full analog signal range (V− to V+) and maintains sub-250pA leakage at +25°C.

It supports TTL/CMOS-compatible logic thresholds (V_IL = 0.8V, V_IH = 2.4V) with <10µW quiescent power consumption, and achieves 175ns turn-on / 100ns turn-off times under 5V dual-supply conditions - making it suitable for high-fidelity sample-and-hold circuits and military radio front-end switching where timing integrity and channel matching are critical.

Key Specifications

Pinout & Package

MAX385CSE+ is housed in a 16-pin narrow SO (small-outline) package with 1.27mm lead pitch, JEDEC MS-012AC compliant, rated for 0°C to +70°C operation. The package features gull-wing leads, surface-mount compatibility, and thermal resistance θ_JA = 115°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG1414BRUZ and TS5A3157DCKR, MAX385CSE+ uniquely supports ±8V dual supplies and rail-to-rail analog switching without external level shifters - making it irreplaceable in legacy military and test equipment requiring wide dynamic range and bipolar signal integrity.

Availability

MAX385CSE+ is available at Aetrix Electronics and suitable for test equipment, military radios, and battery-operated systems requiring stable component supply, long-term lifecycle support, and guaranteed temperature-grade compliance (0°C to +70°C).

Supply support for MAX385CSE+ 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 and mixed-signal ICs for precision, power, and interface applications.

The MAX381/MAX383/MAX385 family was engineered for low-voltage, low-leakage, high-accuracy analog signal routing in mission-critical systems - emphasizing channel matching, charge injection control, and wide-supply flexibility.

FAQ

What is the maximum analog signal voltage range supported by MAX385CSE+?

MAX385CSE+ supports analog signals from V− to V+, enabling rail-to-rail operation. With ±8V dual supplies, that is −8V to +8V; with +15V single supply and V− tied to GND, it handles 0V to +15V. Absolute maximum ratings limit V+ to +17V and V− to −17V, but functional range remains bounded by supply rails. This capability is confirmed in the Electrical Characteristics tables for both dual- and single-supply configurations.

Is MAX385CSE+ pin-compatible with industry-standard analog switches?

Yes, MAX385CSE+ is explicitly pin-compatible with DG401, DG403, and DG405 analog switches per its Features section. Pin mapping matches for COM, NO, IN, V+, V−, and GND positions in the 16-pin narrow SO package. However, note that DG40x devices lack guaranteed <2Ω R_ON matching and <5pC charge injection - so functional equivalence requires verification of those parameters in the target application.

What is the guaranteed on-resistance flatness specification for MAX385CSE+?

MAX385CSE+ guarantees on-resistance flatness of ≤4Ω over its specified analog signal range (V− to V+), defined as the difference between maximum and minimum R_ON measured across that range. This is documented in the "On-Resistance Flatness" row of the Electrical Characteristics tables under both dual- and single-supply conditions, and applies across the full 0°C to +70°C operating temperature range.

Does MAX385CSE+ require external protection diodes for overvoltage conditions?

External protection diodes are recommended only if proper power-supply sequencing cannot be ensured - specifically, if V+ is not powered first, followed by V−, then logic inputs. Figure 1 in the datasheet shows two series diodes (D1, D2) on V+ and V− lines. MAX385CSE+ itself includes internal protection diodes, but external ones prevent latch-up during supply transients. Their use reduces analog range by ~1.4V but preserves all key specs including R_ON and leakage.

What is the logic polarity of the IN1 and IN2 inputs on MAX385CSE+?

IN1 and IN2 on MAX385CSE+ are active-high logic inputs: a logic high (≥2.4V) enables conduction between the corresponding COM and NO terminals, while a logic low (≤0.8V) opens the switch. This is confirmed in the Truth Tables and Pin Description sections, and consistent across all MAX381/3/5 variants. No inversion is applied - the logic sense matches standard CMOS/TTL behavior.