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Home > Products > Integrated Circuits (ICs) > Interface > Analog Switches, Multiplexers, Demultiplexers

Analog Devices Inc./Maxim Integrated MAX4631EPE+

Name: MAX4631EPE+
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX4631EPE+
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MAX4631EPE+

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Analog Switches, Multiplexers, Demultiplexers

Package:: -

Datasheet:: MAX4631EPE+.pdf

Description:: IC SWITCH DUAL SPST 16DIP

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Product details

Overview

MAX4631EPE+ from Maxim Integrated is a fault-protected, dual SPST analog switch IC designed for high-voltage signal routing in industrial and test equipment. It features 85Ω max on-resistance at +25°C, ±36V fault protection on NO terminals with power applied, rail-to-rail signal handling, and operates from ±4.5V to ±18V dual supplies or +9V to +36V single supply. It delivers robust overvoltage resilience during power-up/down in ATE and process control systems.

For engineers reviewing the MAX4631EPE+ datasheet, MAX4631EPE+ pinout, MAX4631EPE+ application, or MAX4631EPE+ equivalent, key selection criteria include fault-protection voltage limits (±36V), dual/SPST topology, leakage current ≤0.5nA at +25°C, TTL/CMOS-compatible logic thresholds, and compatibility with DG401/DG403 pinouts for legacy board upgrades.

Technical Context

The MAX4631EPE+ implements a parallel N-channel/P-channel FET architecture with integrated voltage-sensing comparators on each NO terminal. During normal operation, it achieves low on-resistance via concurrent conduction of complementary FETs; during overvoltage faults (>V+ or

It supports bidirectional signal flow between COM and NO pins within the supply rails, requires no power-supply sequencing, and maintains all switches off when unpowered. Its logic inputs accept 0.8V/2.4V thresholds across ±15V or +12V supplies, ensuring interoperability with both TTL and CMOS drivers without level-shifting.

Key Specifications

Parameter	Value and Actual Design Meaning
Switch Type	Dual SPST - enables independent routing of two analog signals without NC path interaction
On-Resistance (max)	85Ω at +25°C - ensures minimal signal attenuation and voltage drop in precision measurement paths
Fault Protection Range	±36V on NO pins with power applied - protects downstream circuitry from transient overvoltages in industrial I/O
Off-Leakage Current (max)	0.5nA at +25°C - preserves signal integrity in high-impedance sensor multiplexing applications
Supply Range	±4.5V to ±18V dual or +9V to +36V single - supports flexible system-level power architecture design
Logic Compatibility	TTL/CMOS with 0.8V/2.4V thresholds - eliminates need for external logic translators in mixed-voltage systems
Turn-On/Off Time	100ns/50ns typical - suitable for moderate-speed data acquisition and switching matrix timing

Pinout & Package

MAX4631EPE+ is housed in a 16-pin plastic DIP package (0°C to +70°C operating range) with through-hole mounting and standard 0.3" width. Pin 1 is top-left corner (notch side), pin 16 top-right.

Pin/Terminal	Circuit Role	Design Meaning
1, 8	COM1, COM2	Analog common terminals - bidirectional signal ports connected to load or measurement circuitry
2, 7, 12	N.C.	No internal connection - must remain unconnected; no pull-up/down or routing required
3, 6	NO1, NO2	Fault-protected normally open terminals - exposed to field signals up to ±36V; only pins with overvoltage hardening
4, 5	NC1, NC2	Not used - unused in MAX4631 configuration; left floating per datasheet
9, 16	NO1, NO2 (redundant labeling)	Same as pins 3/6 - confirms dual NO function; no functional distinction
10, 15	IN1, IN2	Digital control inputs - drive switch state (ON/OFF) with standard logic levels; ESD-protected
11	V+	Positive supply input - powers internal logic and P-FET gates; sets logic high threshold
13	GND	Ground reference - return path for logic circuitry and level translators; isolated from analog paths
14	V−	Negative supply input - powers N-FET gates and defines lower logic threshold; enables bipolar operation

Key Features

Feature	Design Value
Rail-to-rail signal handling	Passes signals from V− to V+ without clipping - essential for full-scale sensor output capture in data acquisition
Fault protection (±36V, powered)	Clamps COM to V+ or V− during overvoltage - prevents damage to ADCs, op-amps, or microcontrollers downstream
No power-supply sequencing required	Operates safely with arbitrary V+/V− ramp order - simplifies power management in multi-rail industrial systems
Pin compatibility with DG401/DG403	Direct PCB replacement in legacy designs - reduces redesign time and qualification effort for analog switch upgrades
Low power consumption (<6mW)	Reduces thermal load and standby current in battery-backed or thermally constrained modules

Applications

ATE Equipment	Data Acquisition
Use Scenario: Automated test systems route multiple sensor or DUT signals to shared instrumentation resources under varying voltage conditions. IC Role / Device Role / Timing Role: Dual SPST switch isolates and selects analog channels while surviving ±36V transients from relay bounce or DUT faults. Use Value: Eliminates need for external TVS or series resistors, reducing BOM count and improving test repeatability across voltage domains.	Use Scenario: High-precision data loggers multiplex thermocouples, strain gauges, or RTDs into a single ADC front-end. IC Role / Device Role / Timing Role: Low-leakage (0.5nA), low-R_ON (85Ω) analog switch minimizes gain/offset errors and thermal EMF effects. Use Value: Enables 16-bit+ accuracy without calibration drift from switch-induced errors in cold-junction compensation circuits.
Industrial Process Control	Avionics Signal Conditioning
Use Scenario: PLC analog I/O modules condition 4–20mA or ±10V field signals before digitization, often exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Fault-protected NO terminals absorb ±36V transients without latch-up or parametric shift during brownout recovery. Use Value: Extends mean time between failures (MTBF) in harsh environments where traditional switches require external protection networks.	Use Scenario: Flight control computers route redundant sensor outputs (e.g., air data, inertial) to cross-channel monitoring units. IC Role / Device Role / Timing Role: Dual SPST topology provides independent isolation of primary/backup channels with guaranteed off-state integrity. Use Value: Meets DO-254 safety requirements for fault containment - a single switch failure cannot compromise both signal paths.

ATE Equipment

Data Acquisition

Use Scenario: Automated test systems route multiple sensor or DUT signals to shared instrumentation resources under varying voltage conditions.

IC Role / Device Role / Timing Role: Dual SPST switch isolates and selects analog channels while surviving ±36V transients from relay bounce or DUT faults.

Use Value: Eliminates need for external TVS or series resistors, reducing BOM count and improving test repeatability across voltage domains.

Use Scenario: High-precision data loggers multiplex thermocouples, strain gauges, or RTDs into a single ADC front-end.

IC Role / Device Role / Timing Role: Low-leakage (0.5nA), low-R_ON (85Ω) analog switch minimizes gain/offset errors and thermal EMF effects.

Use Value: Enables 16-bit+ accuracy without calibration drift from switch-induced errors in cold-junction compensation circuits.

Industrial Process Control

Avionics Signal Conditioning

Use Scenario: PLC analog I/O modules condition 4–20mA or ±10V field signals before digitization, often exposed to lightning-induced surges.

IC Role / Device Role / Timing Role: Fault-protected NO terminals absorb ±36V transients without latch-up or parametric shift during brownout recovery.

Use Value: Extends mean time between failures (MTBF) in harsh environments where traditional switches require external protection networks.

Use Scenario: Flight control computers route redundant sensor outputs (e.g., air data, inertial) to cross-channel monitoring units.

IC Role / Device Role / Timing Role: Dual SPST topology provides independent isolation of primary/backup channels with guaranteed off-state integrity.

Use Value: Meets DO-254 safety requirements for fault containment - a single switch failure cannot compromise both signal paths.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX4631CPE+	Same electrical specs but rated for 0°C to +70°C commercial temperature range; narrower SO package not pin-compatible with DIP	Suitable for non-industrial ambient environments; lacks extended temp margin for enclosure-mounted I/O modules	Select MAX4631CPE+ only if board layout uses SO-16 footprint and operating environment stays within 0–70°C
ADG408BRZ	8-channel, single-pole switch; no fault protection; 44Ω R_ON; ±15V supplies only; TTL/CMOS compatible	Higher channel count but zero overvoltage resilience - requires external protection for field-connected sensors	Choose ADG408BRZ only when channel density outweighs fault tolerance needs and external TVS diodes are acceptable

Compared with MAX4631CPE+ and ADG408BRZ, the MAX4631EPE+ uniquely combines DIP-16 mechanical compatibility, ±36V fault protection, and dual SPST topology-making it the sole option for drop-in upgrades of legacy DG401-based systems requiring enhanced ruggedness without PCB revision.

Availability

MAX4631EPE+ is available at Aetrix Electronics and suitable for ATE equipment, industrial process control systems, and avionics signal conditioning requiring stable component supply across extended temperature and high-reliability use cases.

Supply support for MAX4631EPE+ 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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.

The MAX4631EPE+ belongs to Maxim's fault-protected analog switch product line, engineered specifically to replace legacy DG-series switches in mission-critical systems where overvoltage resilience, rail-to-rail operation, and pin compatibility are mandatory.

FAQ

What is the maximum fault voltage the MAX4631EPE+ can withstand on its NO pins?

The MAX4631EPE+ withstands up to ±36V on NO1 and NO2 pins when power is applied (V+ = ±15V), and ±40V when fully unpowered. Exceeding these limits risks permanent damage. This rating applies only to NO pins - COM and IN pins are not fault-protected and must remain within V− to V+.

Is the MAX4631EPE+ pin-compatible with the DG401?

Yes, the MAX4631EPE+ has identical pinout and footprint to the DG401, including COM1/COM2, NO1/NO2, IN1/IN2, V+, V−, and GND placements. However, only the NO pins inherit fault protection - NC pins are unused in MAX4631EPE+, so existing DG401 layouts with NC connections require verification before substitution.

Does the MAX4631EPE+ support single-supply operation?

Yes, the MAX4631EPE+ operates from a single +9V to +36V supply with V− tied to GND. In this mode, logic thresholds remain TTL/CMOS-compatible (0.8V/2.4V), and fault protection extends to ±36V on NO pins relative to GND. On-resistance increases slightly versus dual-supply operation but stays within 85Ω max at +25°C.

What is the typical on-resistance matching between the two switches in the MAX4631EPE+?

The MAX4631EPE+ guarantees on-resistance matching of ≤6Ω max between its two SPST channels at +25°C (ΔR_ON = R_ON(MAX) − R_ON(MIN)). This tight matching ensures consistent gain and offset behavior when routing differential or ratiometric signals across both channels in precision instrumentation.

Can the MAX4631EPE+ be used in bidirectional signal paths?

Yes, the MAX4631EPE+ supports fully bidirectional analog signal flow between COM and NO pins when voltages remain within V− to V+. Its complementary N/P-FET structure ensures symmetrical R_ON, capacitance, and charge injection - critical for applications like audio switching or sensor excitation where signal direction may reverse dynamically.

MAX4631EPE+ Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: *

Packaging:

Product Status:: Obsolete

Switch Circuit:: -

Multiplexer/Demultiplexer Circuit:: -

Number of Circuits:: -

On-State Resistance (Max):: -

Channel-to-Channel Matching (ΔRon):: -

Voltage - Supply, Single (V+):: -

Voltage - Supply, Dual (V±):: -

Switch Time (Ton, Toff) (Max):: -

-3db Bandwidth:: -

Charge Injection:: -

Channel Capacitance (CS(off), CD(off)):: -

Current - Leakage (IS(off)) (Max):: -

Crosstalk:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

MAX4631EPE+ FAQ

1.How can I place an order for MAX4631EPE+ through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX4631EPE+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MAX4631EPE+ reliable?

The price and inventory of MAX4631EPE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4631EPE+ is usually 5 days.

3.What payment methods are accepted for MAX4631EPE+?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4631EPE+ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX4631EPE+?

MAX4631EPE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX4631EPE+ order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MAX4631EPE+?

For technical support, including MAX4631EPE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4631EPE+ requirements.

6.How does Aetrix verify that MAX4631EPE+ is sourced from the original manufacturer or authorized distributors?

All MAX4631EPE+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX4631EPE+ meets industry standards.

7.What is the process for return or replacement of MAX4631EPE+?

All MAX4631EPE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4631EPE+, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MAX4631EPE+ part is unused and in its original packaging.

Return procedure for MAX4631EPE+:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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