Analog Devices Inc./Maxim Integrated MAX4709EPE

Overview

The MAX4709EPE from Maxim Integrated is a dual 4-to-1 fault-protected analog multiplexer in a 16-pin plastic DIP package, designed for high-reliability signal routing in harsh voltage environments. It delivers ±40V fault protection with supplies off, 400Ω max on-resistance, rail-to-rail signal handling, and TTL/CMOS-compatible logic inputs - enabling robust channel selection in industrial data-acquisition systems where overvoltage transients are common.

For engineers reviewing the MAX4709EPE datasheet, MAX4709EPE pinout, MAX4709EPE application, or MAX4709EPE equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative parts with documented functional trade-offs.

Technical Context

The MAX4709EPE implements two independent 4-to-1 analog multiplexers (COMA/NO1A–NO4A and COMB/NO1B–NO4B) using parallel N- and P-channel FETs per switch - eliminating series-FET architecture to achieve lower and flatter on-resistance across signal range. Fault detection uses dual comparators monitoring each NO_ input against V+ and V−; during overvoltage, both FETs turn off simultaneously, forcing NO_ and COM_ into high-impedance states regardless of EN or address state.

No power-supply sequencing is required: operation is valid across dual ±4.5V to ±20V or single +9V to +36V rails, with rail-to-rail analog signal handling (VNO_ = V− to V+) and guaranteed fault response within 100ns. The COM_ pins are not fault protected - external voltage limits must stay within supply rails to avoid damage via internal ESD diodes.

Key Specifications

Pinout & Package

MAX4709EPE uses a 16-pin plastic DIP package (0.3-inch width), with through-hole mounting and industry-standard footprint compatible with socket-based test and legacy industrial PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fault-protected analog multiplexer applications.

Compared with MAX4709EPE, MAX4712EPE trades wider supply range and lower on-resistance for reduced fault voltage margin, while ADG509BNZ offers superior analog performance at the cost of zero integrated fault protection - making MAX4709EPE the sole choice when ±40V transient survivability is mandatory.

Availability

MAX4709EPE is available at Aetrix Electronics and suitable for industrial data-acquisition systems, avionics signal routing, and ATE channel management requiring stable component supply with long-term obsolescence mitigation.

Supply support for MAX4709EPE 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 demanding industrial, automotive, and communications applications.

The MAX4708/MAX4709 family was engineered specifically for fault-tolerant analog signal routing in environments with unpredictable field-wiring transients, emphasizing robustness over raw speed or ultra-low on-resistance.

FAQ

What is the maximum fault voltage the MAX4709EPE can withstand with power supplies turned off?

The MAX4709EPE guarantees ±40V fault protection on all NO_ pins when V+ and V− are at 0V. During this condition, NO_ and COM_ terminals enter high-impedance states, preventing current flow into downstream circuitry. This rating is production-tested and applies regardless of COM_ load configuration, making MAX4709EPE suitable for hot-swap and maintenance scenarios where field wiring may be live before system power-up.

Does the MAX4709EPE require external pull-up or pull-down resistors on its address pins (A0, A1)?

No, the MAX4709EPE does not require external pull-up or pull-down resistors on A0 or A1. Its digital inputs feature TTL/CMOS-compatible thresholds (VIH = 2.4V, VIL = 0.8V) and internal biasing that ensures reliable logic recognition across its full supply range (±4.5V to ±20V dual or +9V to +36V single). External resistors add unnecessary node capacitance and are omitted in Maxim's reference designs for MAX4709EPE.

Can the COMA and COMB outputs of the MAX4709EPE be tied together to create an 8-to-1 configuration?

No, COMA and COMB outputs must not be externally tied together. The MAX4709EPE lacks internal isolation between its two mux sections when outputs are paralleled, risking shoot-through current, undefined logic states, and potential damage during address transitions. For 8-to-1 functionality, use the pin-compatible MAX4708EPE - a single 8-to-1 variant with one COM pin and identical fault-protection architecture.

What is the impact of supply asymmetry on MAX4709EPE performance?

The MAX4709EPE supports asymmetric dual supplies (e.g., V+ = +18V, V− = −6V) as long as |V+ − V−| ≤ 44V. On-resistance and fault thresholds scale linearly with total supply span: e.g., ±15V yields 400Ω max RON and ±25V fault protection, while +18V/−6V (24V span) maintains proportional performance. However, COM_ voltage limits remain referenced to actual V+ and V− rails - never to ground - so proper level alignment is essential.

Is the MAX4709EPE RoHS-compliant and lead-free?

Yes, the MAX4709EPE is RoHS-compliant and lead-free. Per Maxim's packaging documentation (Package Code 21-0043), the 16-pin plastic DIP variant uses matte tin lead finish and meets JEDEC J-STD-609 Class 2a requirements. The device carries the "E" suffix per Maxim's ordering nomenclature, indicating commercial-grade temperature range (−40°C to +85°C) and RoHS-conforming materials.