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Analog Devices Inc./Maxim Integrated MAX4731ETA+
- Part No.:
- MAX4731ETA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX4731ETA+.pdf
- Description:
- IC SWITCH SPST-NOX2 25OHM 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,173
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Product details
Overview
The MAX4731ETA+ from Maxim Integrated is a dual, normally open (NO), single-pole/single-throw (SPST) analog switch IC designed for low-voltage signal routing in space-constrained systems. It operates from a single +2V to +11V supply, delivers ≤50Ω on-resistance at +3V, maintains ≤3.5Ω channel-to-channel RON matching, and exhibits <0.1nA leakage at +25°C - enabling precision, ultra-low-power operation in battery-powered audio and data-acquisition circuits.
For engineers reviewing the MAX4731ETA+ datasheet, MAX4731ETA+ pinout, MAX4731ETA+ application, or MAX4731ETA+ equivalent, this device is selected for rail-to-rail analog switching with sub-nW quiescent power, high off-isolation (–72dB at 1MHz), and guaranteed crosstalk rejection (–108dB), particularly where TDFN-EP packaging and logic-compatible control simplify integration into portable and mixed-signal designs.
Technical Context
The MAX4731ETA+ implements two independent CMOS SPST switches with NO configuration, each controlled by a TTL/CMOS-compatible digital input (IN1, IN2). Its architecture supports bidirectional analog signal flow between COM and NO terminals across the full supply range (GND to V+), with on-resistance flatness ≤9Ω over the signal band at +3V.
It features integrated ESD protection and internal clamp diodes, requires no external biasing, and guarantees break-before-make timing only in the MAX4733 variant - not applicable here. The exposed-pad TDFN-EP package enhances thermal performance and supports high-density PCB layouts without compromising signal integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.0V to +11V - enables direct interface with Li-ion, 3.3V, and 5V systems without level-shifting. |
| On-Resistance (RON) | ≤50Ω max at +3V - ensures minimal signal attenuation and distortion in audio/data paths. |
| RON Matching | ≤3.5Ω max at +3V - preserves gain/phase balance between dual channels in differential or parallel routing. |
| Leakage Current | <0.1nA at +25°C - critical for maintaining accuracy in high-impedance sensor front-ends and battery-monitoring circuits. |
| Off-Isolation | –72dB at 1MHz - suppresses coupling between inactive channels in multi-source A/V or mux applications. |
| Crosstalk | –108dB at 1MHz - prevents interference between simultaneously active signal paths (e.g., stereo audio routing). |
| Turn-On/Off Time | 70ns / 30ns typical at +3V - supports fast-switching requirements in data acquisition and digital potentiometer emulation. |
Pinout & Package
MAX4731ETA+ uses an 8-pin TDFN-EP (3mm × 3mm × 0.8mm) package with exposed pad (EP) connected to V+. This thermally enhanced, lead-free RoHS-compliant package reduces board area versus µMAX while improving power dissipation and high-frequency performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN1 | Digital control input for Switch 1 | TTL/CMOS-compatible; drives NO1 connection when high (logic "1") per truth table. |
| 2 - IN2 | Digital control input for Switch 2 | Independent logic control; allows asynchronous routing of two analog signals. |
| 3 - COM2 | Common terminal for Switch 2 | Bidirectional node - connects to source or load depending on system topology. |
| 4 - NO2 | Normally open terminal for Switch 2 | Open-circuit when IN2 = 0; closed to COM2 when IN2 = 1 - defines signal path continuity. |
| 5 - GND | Ground reference | Digital and analog ground return; must be low-impedance for leakage and noise control. |
| 6 - COM1 | Common terminal for Switch 1 | Shared analog node for first switch; supports rail-to-rail voltage swing (0V to V+). |
| 7 - NO1 | Normally open terminal for Switch 1 | Signal output/input endpoint; matched RON and flatness ensure consistent channel behavior. |
| 8 - V+ | Positive supply input | Single power rail; powers internal logic and analog switch core; EP tied to this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail analog signal handling | Supports full 0V to V+ signal range without clipping or distortion - essential for unipolar sensor outputs and audio waveforms. |
| Ultra-low quiescent power | 0.5nW typical - extends battery life in always-on portable devices such as wearables and remote sensors. |
| Guaranteed RON flatness | ≤9Ω max at +3V - minimizes harmonic distortion and amplitude variation across signal amplitude range. |
| High off-isolation and low crosstalk | –72dB off-isolation and –108dB crosstalk at 1MHz - enables clean multiplexing in RF-adjacent or high-fidelity audio stages. |
| TTL/CMOS logic compatibility | VIH = 2.0V, VIL = 0.8V at +5V supply - simplifies interface with microcontrollers and FPGAs without external level shifters. |
Applications
| Audio Signal Routing | Data Acquisition Multiplexing |
|---|---|
|
Use Scenario: Selecting between multiple microphone inputs or routing line-level stereo signals in a portable media player. IC Role / Device Role / Timing Role: Dual SPST analog switch providing isolated, low-distortion signal paths under microcontroller GPIO control. Use Value: ≤50Ω RON and ≤3.5Ω matching preserve channel balance; –108dB crosstalk prevents left/right bleed in stereo playback. |
Use Scenario: Scanning eight sensor outputs into a single ADC channel using sequential switching in a battery-powered environmental monitor. IC Role / Device Role / Timing Role: Low-leakage, rail-to-rail analog switch enabling accurate DC-coupled sampling of high-impedance pH or temperature sensors. Use Value: <0.1nA leakage avoids measurement offset errors; 70ns turn-on time supports ≥10MSPS effective multiplexing rates. |
| Portable Communications Interface | Low-Power Instrumentation Front-End |
|
Use Scenario: Enabling/disabling audio codec connections (e.g., headset vs. speaker) in a cellular handset based on jack detection status. IC Role / Device Role / Timing Role: Dual NO switch isolating analog paths during mode transitions to prevent pop/click artifacts and cross-talk. Use Value: Sub-nW quiescent power eliminates standby drain; 0.5nW consumption extends talk-time without sacrificing audio fidelity. |
Use Scenario: Protecting precision op-amp inputs from overvoltage transients in handheld test equipment with auto-ranging capability. IC Role / Device Role / Timing Role: Analog guard switch that disconnects sensitive nodes during range switching or fault conditions. Use Value: Absolute maximum rating of V+ +0.3V on analog pins and internal clamps allow safe operation up to +11.3V transient exposure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual SPST analog switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4731EUA+ | Same electrical specs; uses 8-pin µMAX package (3.05mm × 3.05mm) instead of TDFN-EP. | Less thermal efficiency and larger footprint; preferred only where µMAX socket compatibility or legacy layout reuse is required. | Select MAX4731EUA+ only if board space and thermal constraints permit larger package; otherwise MAX4731ETA+ offers superior density and thermal performance. |
| ADG721BRMZ-REEL7 | 5V-only supply (2.7V–5.5V); 4Ω RON max at +5V; no exposed pad; higher leakage (1nA typ). | Better RON at 5V but incompatible with 2V–3.3V battery rails; unsuitable for ultra-low-leakage sensor front-ends. | Choose ADG721BRMZ-REEL7 only for fixed 5V systems prioritizing lowest RON; avoid for battery-powered or wide-supply designs requiring <0.1nA leakage. |
Compared with MAX4731EUA+, the MAX4731ETA+ delivers better thermal management and 30% smaller PCB area; compared with ADG721BRMZ-REEL7, it supports wider supply range and lower leakage, making it more versatile for portable and precision applications despite slightly higher RON at 3V.
Availability
MAX4731ETA+ is available at Aetrix Electronics and suitable for battery-powered systems, audio/video-signal routing, and low-voltage data-acquisition systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX4731ETA+ 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, communications, and consumer applications.
The MAX4731 series belongs to Maxim's precision analog switch product line, engineered for ultra-low-power, rail-to-rail signal routing in portable and space-constrained electronic systems.
FAQ
What is the maximum supply voltage for the MAX4731ETA+?
The MAX4731ETA+ has an absolute maximum supply voltage (V+) of +12V, but its specified operational range is +2.0V to +11V. Operating continuously at +11V is permitted with proper bypassing: a minimum 0.1µF capacitor must be placed between V+ and GND as close to the IC as possible to ensure stability and prevent latch-up.
Does the MAX4731ETA+ support rail-to-rail analog signals?
Yes, the MAX4731ETA+ supports true rail-to-rail analog signal handling - signals from 0V to V+ pass through the switch with minimal RON variation. At +3V supply, RON flatness is guaranteed ≤9Ω across the full 0V to +3V range, preserving signal integrity for unipolar sensors and audio waveforms.
What is the function of the exposed pad (EP) on the MAX4731ETA+ TDFN package?
The exposed pad (EP) on the MAX4731ETA+ TDFN-EP package is electrically connected to V+ and serves as a thermal and electrical enhancement. It must be soldered to a V+-connected copper pour on the PCB to improve heat dissipation and reduce thermal resistance - critical for maintaining parametric performance under sustained load or elevated ambient temperatures.
How does the logic control interface work on the MAX4731ETA+?
The MAX4731ETA+ uses two independent TTL/CMOS-compatible digital inputs (IN1, IN2): a logic high (≥2.0V at +5V supply, rail-to-rail at other voltages) closes the corresponding NO switch (NO1/NO2 to COM1/COM2), while a logic low opens it. No external pull-ups or level shifters are needed when interfaced with standard microcontrollers.
Is the MAX4731ETA+ pin-compatible with other variants like MAX4732ETA+ or MAX4733ETA+?
No - although all three share the same TDFN-EP package and pin count, their internal switch configurations differ: MAX4731ETA+ has two NO switches, MAX4732ETA+ has two NC switches, and MAX4733ETA+ has one NO and one NC. Pin functions match (e.g., IN1, COM1, V+), but signal routing behavior and truth tables are not interchangeable without circuit redesign.
MAX4731ETA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Switch Circuit:
- SPST - NO
- Multiplexer/Demultiplexer Circuit:
- 1:1
- Number of Circuits:
- 2
- On-State Resistance (Max):
- 25Ohm
- Channel-to-Channel Matching (ΔRon):
- 200mOhm
- Voltage - Supply, Single (V+):
- 2V ~ 11V
- Voltage - Supply, Dual (V±):
- -
- Switch Time (Ton, Toff) (Max):
- 85ns, 45ns
- -3db Bandwidth:
- 300MHz
- Charge Injection:
- 7.5pC
- Channel Capacitance (CS(off), CD(off)):
- 20pF, 20pF
- Current - Leakage (IS(off)) (Max):
- 100pA
- Crosstalk:
- -108dB @ 1MHz
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TDFN (3x3)
MAX4731ETA+ FAQ
1.How can I place an order for MAX4731ETA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4731ETA+ 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 MAX4731ETA+ reliable?
The price and inventory of MAX4731ETA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4731ETA+ is usually 5 days.
3.What payment methods are accepted for MAX4731ETA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4731ETA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4731ETA+?
MAX4731ETA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4731ETA+ 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 MAX4731ETA+?
For technical support, including MAX4731ETA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4731ETA+ requirements.
6.How does Aetrix verify that MAX4731ETA+ is sourced from the original manufacturer or authorized distributors?
All MAX4731ETA+ 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 MAX4731ETA+ meets industry standards.
7.What is the process for return or replacement of MAX4731ETA+?
All MAX4731ETA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4731ETA+, 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 MAX4731ETA+ part is unused and in its original packaging.
Return procedure for MAX4731ETA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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