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Analog Devices Inc./Maxim Integrated MAX4729EXT+T
- Part No.:
- MAX4729EXT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
MAX4729EXT+T.pdf
- Description:
- IC SWITCH SPDT X 1 5.5OHM SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,167
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Product details
Overview
MAX4729EXT+T from Maxim Integrated is a low-voltage, single-pole/double-throw (SPDT) CMOS analog switch in 6-pin SC70 package, featuring 3.5Ω typical on-resistance at +2.7V supply, 0.45Ω RON flatness, and 1nA supply current. It operates from +1.8V to +5.5V and is used for audio/video signal routing and battery-powered data-acquisition systems.
For engineers reviewing the MAX4729EXT+T datasheet, MAX4729EXT+T pinout, MAX4729EXT+T application, or MAX4729EXT+T equivalent, key selection criteria include guaranteed RON flatness over temperature, sub-1nA quiescent current, -40°C to +85°C operation, and SC70 footprint compatibility with space-constrained portable designs.
Technical Context
The MAX4729EXT+T implements a single SPDT analog switch using CMOS process technology, supporting bidirectional signal flow between COM and either NO or NC terminals under TTL/CMOS-compatible digital control. Its architecture delivers matched channel performance with 0.05Ω RON match and maintains low distortion (0.036% THD) across 20Hz–20kHz.
It features break-before-make switching (1ns typical), 300MHz -3dB bandwidth, and robust overvoltage tolerance: logic inputs accept up to +5.5V regardless of V+, while analog terminals tolerate signals from GND to V+ +0.3V via internal clamping diodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +1.8V to +5.5V single supply - enables direct interface with Li-ion, 3.3V, and 5V logic domains without level shifters |
| On-Resistance (RON) | 3.5Ω typical at +2.7V - ensures minimal signal attenuation and voltage drop in precision analog paths |
| RON Flatness | 0.45Ω max at +2.7V - preserves linearity across full analog input range (0V to V+), critical for audio and sensor signals |
| Supply Current (I+) | 1nA typical - supports multi-year battery life in always-on portable instrumentation and wearables |
| -3dB Bandwidth | 300MHz - supports high-fidelity video routing (e.g., HDMI auxiliary channels) and fast data acquisition sampling |
| Off-Isolation | -67dB at 1MHz - suppresses crosstalk between active and inactive signal paths in multiplexed systems |
| Charge Injection | 3pC - minimizes voltage glitch at COM during switching, reducing need for hold capacitor oversizing in sample-and-hold |
Pinout & Package
MAX4729EXT+T is packaged in a 6-pin SC70 (outline 21-0077), measuring 2.0mm × 1.25mm × 0.9mm, with wettable flank leads for automated optical inspection (AOI).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NO) | Normally Open analog terminal | Connects to COM when IN = HIGH; open-circuit when IN = LOW - used for default-off signal path selection |
| 2 (V+) | Positive supply voltage | Single power rail for analog and digital sections; accepts +1.8V to +5.5V; powers internal bias and switch FETs |
| 3 (GND) | Ground reference | Analog and digital common return; must be low-impedance to minimize noise coupling into sensitive analog paths |
| 4 (NC) | Normally Closed analog terminal | Connects to COM when IN = LOW; open-circuit when IN = HIGH - provides default-on signal routing capability |
| 5 (COM) | Common analog terminal | Bidirectional I/O node; connects to system signal source or load; requires careful PCB layout to avoid parasitic capacitance |
| 6 (IN) | Digital control input | TTL/CMOS-compatible logic input; accepts 0V to +5.5V regardless of V+ - enables mixed-voltage system interfacing |
Key Features
| Feature | Design Value |
|---|---|
| Low 3.5Ω RON at +2.7V | Reduces insertion loss and gain error in precision signal chains, especially in 12-bit+ data acquisition front-ends |
| 0.45Ω RON flatness | Maintains consistent channel gain across full input voltage swing, eliminating amplitude-dependent distortion in audio paths |
| 1nA supply current | Enables integration into ultra-low-power wake-on-event circuits without compromising battery runtime |
| 300MHz bandwidth | Supports composite video, USB 2.0 ID detection, and high-speed sensor multiplexing without signal degradation |
| 0.036% THD | Preserves audio fidelity in portable media players and headset switching applications without post-processing compensation |
Applications
| Audio Signal Routing | Portable Data Acquisition |
|---|---|
|
Use Scenario: Switching between stereo headphone outputs and mono speaker output in Bluetooth earbuds. IC Role / Device Role / Timing Role: SPDT analog switch controlling signal path direction under MCU GPIO control. Use Value: 3.5Ω RON and 0.036% THD prevent audible distortion; 1nA I+ extends charge cycle by >15% versus legacy switches. |
Use Scenario: Multiplexing multiple thermistor or RTD inputs into a single ADC channel in handheld test equipment. IC Role / Device Role / Timing Role: Low-leakage analog switch enabling accurate ratiometric measurements without calibration drift. Use Value: <±4nA COM on-leakage and <±3nA NO/NC off-leakage ensure <0.01% measurement error at 16-bit resolution. |
| Sample-and-Hold Circuits | Relay Replacement in IoT Sensors |
|
Use Scenario: Sampling analog sensor outputs at 100kSPS in battery-powered environmental monitors. IC Role / Device Role / Timing Role: Precision hold switch with minimal charge injection to reduce aperture uncertainty. Use Value: 3pC charge injection limits hold-step error to <1LSB for 12-bit conversions with 1nF hold capacitors. |
Use Scenario: Replacing electromechanical relays in smart home occupancy sensors to eliminate contact wear and bounce. IC Role / Device Role / Timing Role: Solid-state SPDT switch providing silent, bounce-free, and million-cycle reliable signal routing. Use Value: 300MHz bandwidth and -67dB off-isolation enable clean 2.4GHz RF sensor coexistence without shielding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SPDT analog switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4730EXT+T | Higher RON flatness (1.3Ω max) and lower RON match (0.2Ω vs. 0.05Ω); same SC70 package and pinout | Optimized for high-precision differential signal routing where channel matching outweighs flatness requirements | Select MAX4730EXT+T when RON match between NO/NC paths is prioritized over flatness across voltage range |
| TMUX1574DSGR | Lower RON (0.75Ω typ), but higher supply current (100nA), no guaranteed RON flatness spec, and different pinout (6-pin WSON) | Suitable for high-bandwidth, low-RON applications where leakage and flatness are secondary | Choose TMUX1574DSGR only if board redesign accommodates WSON footprint and system tolerates 100× higher I+ |
Compared with MAX4729EXT+T, MAX4730EXT+T trades flatness for tighter channel matching-ideal for differential sensor interfaces-while TMUX1574DSGR offers lower RON at the cost of higher power and non-pin-compatible packaging, requiring layout revision.
Availability
MAX4729EXT+T is available at Aetrix Electronics and suitable for battery-operated equipment, audio/video-signal routing, and low-voltage data-acquisition systems requiring stable component supply across industrial temperature ranges.
Supply support for MAX4729EXT+T 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, communications, and consumer applications.
The MAX4729EXT+T belongs to Maxim's low-voltage analog switch product line, engineered specifically for portable and energy-sensitive systems demanding ultra-low leakage, flat RON, and mixed-voltage logic compatibility.
FAQ
What is the maximum analog signal voltage range supported by the MAX4729EXT+T?
The MAX4729EXT+T supports analog signals from GND to V+ across its COM, NO, and NC terminals. With internal clamping diodes, it tolerates voltages up to V+ + 0.3V - for example, with V+ = +3.3V, analog inputs may safely reach +3.6V. This allows robust operation in systems with minor supply rail variations or transient overshoot without external protection.
Does the MAX4729EXT+T require separate analog and digital ground planes?
No - the MAX4729EXT+T uses a single GND pin shared by analog and digital sections, and its design assumes a unified low-impedance ground. However, best practice is to route this GND connection directly to the main system ground plane with minimal trace length to avoid noise coupling. Split grounds are unnecessary and may degrade performance due to increased impedance.
Can the MAX4729EXT+T operate with a 1.8V supply while accepting 3.3V logic inputs?
Yes - the MAX4729EXT+T logic input (IN) is overvoltage-tolerant up to +5.5V independent of V+. When powered from +1.8V, the IN pin still reliably recognizes 0V as logic LOW and ≥2.0V as logic HIGH, enabling seamless interface with 3.3V or 5V microcontrollers without level-shifting circuitry.
What is the thermal resistance (θJA) of the MAX4729EXT+T in SC70 package?
The MAX4729EXT+T in SC70 package has a junction-to-ambient thermal resistance (θJA) of 322°C/W, calculated from its 245mW maximum power dissipation at +70°C ambient and 3.1mW/°C derating above that temperature. At 1nA supply current and typical analog loads, self-heating is negligible - less than 0.001°C rise under normal operation.
How does the MAX4729EXT+T handle charge injection during switching, and what impact does it have on precision sampling?
The MAX4729EXT+T specifies 3pC typical charge injection, measured with 1nF load capacitance. In sample-and-hold applications, this induces a voltage step at the hold capacitor: ΔV = Q/C. For a 1nF capacitor, ΔV = 3mV - manageable with proper hold capacitor sizing and settling time allowance. The low value minimizes required correction algorithms in 12-bit systems.
MAX4729EXT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Switch Circuit:
- SPDT
- Multiplexer/Demultiplexer Circuit:
- 2:1
- Number of Circuits:
- 1
- On-State Resistance (Max):
- 5.5Ohm
- Channel-to-Channel Matching (ΔRon):
- 50mOhm
- Voltage - Supply, Single (V+):
- 1.8V ~ 5.5V
- Voltage - Supply, Dual (V±):
- -
- Switch Time (Ton, Toff) (Max):
- 45ns, 26ns
- -3db Bandwidth:
- 300MHz
- Charge Injection:
- 3pC
- Channel Capacitance (CS(off), CD(off)):
- 6.5pF
- Current - Leakage (IS(off)) (Max):
- 2nA
- Crosstalk:
- -67dB @ 1MHz
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-6
MAX4729EXT+T FAQ
1.How can I place an order for MAX4729EXT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4729EXT+T 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 MAX4729EXT+T reliable?
The price and inventory of MAX4729EXT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4729EXT+T is usually 5 days.
3.What payment methods are accepted for MAX4729EXT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4729EXT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4729EXT+T?
MAX4729EXT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4729EXT+T 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 MAX4729EXT+T?
For technical support, including MAX4729EXT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4729EXT+T requirements.
6.How does Aetrix verify that MAX4729EXT+T is sourced from the original manufacturer or authorized distributors?
All MAX4729EXT+T 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 MAX4729EXT+T meets industry standards.
7.What is the process for return or replacement of MAX4729EXT+T?
All MAX4729EXT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4729EXT+T, 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 MAX4729EXT+T part is unused and in its original packaging.
Return procedure for MAX4729EXT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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