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Analog Devices Inc./Maxim Integrated MAX4749ETE
- Part No.:
- MAX4749ETE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX4749ETE.pdf
- Description:
- IC SWITCH SPST-NOX4 25OHM 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,183
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Product details
Overview
MAX4749ETE from Maxim Integrated is a low-voltage, dual SPST analog switch with two normally open (NO) and two normally closed (NC) channels in a 16-pin thin QFN package. It operates from +2V to +11V, delivers ≤50Ω on-resistance at +3V, ≤25Ω at +5V, <0.1nA leakage at +25°C, and supports rail-to-rail signal handling-ideal for precision signal routing in portable medical devices and audio interfaces.
For engineers reviewing the MAX4749ETE datasheet, MAX4749ETE pinout, MAX4749ETE application, or MAX4749ETE equivalent, key selection criteria include guaranteed break-before-make timing (1ns), on-resistance matching (≤3.5Ω at +3V), off-isolation (−72dB at 1MHz), crosstalk (−84dB), and compatibility with TTL/CMOS logic across its full supply range.
Technical Context
The MAX4749ETE implements a CMOS-based dual SPST architecture with independent NO/NC channel pairing per switch, enabling simultaneous bidirectional signal path control. Its internal protection diodes support overvoltage tolerance up to V+ + 0.3V, and logic inputs are rail-to-rail compatible-ensuring reliable switching even at +2V or +11V supply.
Break-before-make timing (tBBM = 1ns) prevents signal shorting during state transitions, while charge injection (7–9pC) and low on-capacitance (40pF COM-on) preserve signal integrity in high-fidelity audio and low-distortion data-acquisition paths. The device is fully specified over −40°C to +85°C and 100% tested at +85°C for Thin QFN variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.0V to +11V - enables single-supply operation in battery-powered and wide-input industrial systems |
| On-Resistance (RON) | ≤50Ω at +3V - ensures minimal signal attenuation in low-voltage sensor front-ends |
| On-Resistance Matching | ≤3.5Ω at +3V - maintains channel-to-channel gain consistency in differential or multiplexed paths |
| Off-Isolation | −72dB at 1MHz - suppresses coupling between inactive channels in multi-source routing |
| Crosstalk | −84dB at 1MHz - prevents interference between adjacent switched signals in dense PCB layouts |
| Leakage Current | ±0.1nA at +25°C - preserves accuracy in high-impedance glucose meter and pH probe interfaces |
| Turn-On/Off Time | 170ns / 70ns at +3V - supports fast multiplexing in real-time data acquisition up to ~1MHz |
Pinout & Package
MAX4749ETE uses a 16-pin thin QFN package (4mm × 4mm × 0.8mm) with exposed paddle (EP) connected to V+. The package supports high thermal efficiency and compact layout in space-constrained portable designs.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3 | COM1, COM2 | Common terminals for dual SPST switches - serve as bidirectional signal I/O points |
| 2 | NO2 | Normally open terminal of Switch 2 - connects to COM2 only when IN2 is HIGH |
| 4, 13 | IN2, IN1 | Digital control inputs - TTL/CMOS-compatible; drive HIGH/LOW relative to V+ for channel selection |
| 5, 12 | IN3, IN4 | Digital control inputs for NC channels - activate NC1/NC2 when driven LOW (inverted logic sense) |
| 6 | GND | Digital ground reference - must be tied to system ground plane for noise immunity |
| 7 | NO3 | Normally open terminal of Switch 3 - paired with COM3 (Pin 9) for third SPST path |
| 9, 10 | COM3, COM4 | Common terminals for additional SPST paths - enable four-channel routing capability |
| 11 | NO4 | Normally open terminal of Switch 4 - completes quad SPST configuration with COM4 |
| 15 | V+ | Positive supply input - powers analog and digital sections; EP must be soldered to V+ plane |
| 16 | NO1 | Normally open terminal of Switch 1 - connects to COM1 (Pin 1) under IN1 control |
| 8, 14 | N.C. | No connection - not internally bonded; left floating or grounded per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Break-before-make timing | 1ns guaranteed - eliminates momentary short-circuit risk during channel switching in critical analog paths |
| Rail-to-rail signal handling | 0V to V+ analog range - preserves full dynamic range of sensors and DAC outputs without level-shifting |
| Ultra-low quiescent power | 0.5nW typical - extends battery life in always-on glucose meters and wearable health monitors |
| TTL/CMOS logic compatibility | VIH = +2.0V, VIL = +0.8V at +3V - allows direct interface with microcontrollers and FPGAs without level shifters |
| Low charge injection | 7pC at +3V - minimizes voltage glitch on high-impedance nodes during switching in precision ADC front-ends |
Applications
| Battery-Powered Medical Devices | Audio Signal Routing |
|---|---|
Use Scenario: Signal path selection in handheld glucose meters with multiple electrode inputs and dual ADC channels. IC Role / Device Role / Timing Role: Dual SPST switch routes analog biosensor signals to measurement circuitry while isolating unused electrodes. Use Value: ≤0.1nA leakage prevents baseline drift; 50Ω RON ensures accurate low-current sensing at +3V battery supply. | Use Scenario: Input source selection in portable Bluetooth speakers with analog line-in, mic-in, and DAC output paths. IC Role / Device Role / Timing Role: Bidirectional analog switch manages signal flow between codecs, amplifiers, and jacks with minimal distortion. Use Value: −84dB crosstalk and 250MHz bandwidth preserve stereo separation and high-frequency audio fidelity. |
| Low-Voltage Data Acquisition | Cell Phone Peripheral Interfaces |
Use Scenario: Multiplexing thermistor, RTD, and strain gauge inputs into a single SAR ADC in industrial IoT edge nodes. IC Role / Device Role / Timing Role: Quad SPST configuration provides four independent analog channel gates controlled by MCU GPIOs. Use Value: ≤3.5Ω RON matching ensures consistent gain scaling across channels; 1ns BBM avoids transient shorts during scan sequencing. | Use Scenario: Managing headset jack detection, microphone bias, and audio path switching in smartphone baseband subsystems. IC Role / Device Role / Timing Role: Dual NO/NC topology enables fail-safe default routing (e.g., NC path to internal speaker when headset unplugged). Use Value: Guaranteed 25Ω RON at +5V supports clean audio pass-through; small 4×4mm QFN saves board area in tight RF modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4749EUD | 14-pin TSSOP package; same electrical specs but larger footprint and lower thermal performance | Suitable for prototyping or legacy board reuse where QFN reflow is unavailable | Select when manual assembly or through-hole compatibility is required |
| MAX4749EBE-T | 16-bump UCSP (2mm × 2mm); identical function but smaller size and different pinout | Preferred for ultra-compact wearables where board area is constrained below 16mm² | Select when minimum footprint and lowest profile are mandatory |
Compared with MAX4749EUD and MAX4749EBE-T, the MAX4749ETE offers optimal thermal dissipation via its exposed paddle and standardized 4×4mm QFN land pattern-making it ideal for production volumes requiring robust reflow yield and long-term reliability in portable electronics.
Availability
MAX4749ETE is available at Aetrix Electronics and suitable for battery-powered medical devices, audio signal routing, and low-voltage data-acquisition systems requiring stable component supply, RoHS-compliant sourcing, and extended temperature operation.
Supply support for MAX4749ETE 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 precision analog and mixed-signal ICs for demanding industrial, medical, and communications applications.
The MAX4747–MAX4750 family was engineered specifically for low-leakage, low-RON analog switching in portable and high-fidelity systems-emphasizing rail-to-rail operation, sub-nA leakage, and guaranteed timing behavior across voltage and temperature.
FAQ
What is the maximum supply voltage rating for MAX4749ETE?
The MAX4749ETE has an absolute maximum V+ rating of +12V, but operational specification is limited to +2V to +11V. Exceeding +11V risks violating functional limits-even if within absolute ratings-and may degrade long-term reliability. Always bypass V+ with ≥0.1µF capacitor near the MAX4749ETE pins for stability at high voltages.
Does MAX4749ETE support true bidirectional signal routing?
Yes, MAX4749ETE supports fully bidirectional analog signal routing. Its CMOS switch architecture allows NO_, NC_, and COM_ terminals to function interchangeably as inputs or outputs-enabling flexible path configurations in both source-to-load and load-to-source directions without polarity constraints.
How does the logic polarity work for NC channels on MAX4749ETE?
On MAX4749ETE, NC channels activate (connect COM to NC) when their corresponding IN_ pin is driven LOW. This inverted logic sense is explicitly defined in the truth table and differs from NO channel behavior (activated HIGH). Designers must route control signals accordingly to avoid unintended default states.
Is the exposed paddle (EP) on MAX4749ETE electrically connected?
Yes, the exposed paddle (EP) on MAX4749ETE is internally connected to V+. It must be soldered to a V+ copper pour on the PCB for proper thermal dissipation and electrical reference. Leaving EP unconnected or grounding it violates the device's thermal and electrical specifications and may cause malfunction.
What is the guaranteed on-resistance flatness for MAX4749ETE at +3V?
At +3V supply, MAX4749ETE guarantees ≤9Ω on-resistance flatness (RFLAT(ON)) over its full analog signal range (0V to V+). This parameter reflects the peak-to-peak variation in RON as the COM voltage sweeps across the rail-to-rail span-critical for maintaining linearity in precision instrumentation amplifier interfaces.
MAX4749ETE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Switch Circuit:
- SPST - NO
- Multiplexer/Demultiplexer Circuit:
- 1:1
- Number of Circuits:
- 4
- On-State Resistance (Max):
- 25Ohm
- Channel-to-Channel Matching (ΔRon):
- 100mOhm
- Voltage - Supply, Single (V+):
- 2V ~ 11V
- Voltage - Supply, Dual (V±):
- -
- Switch Time (Ton, Toff) (Max):
- 85ns, 45ns
- -3db Bandwidth:
- 250MHz
- Charge Injection:
- 9pC
- Channel Capacitance (CS(off), CD(off)):
- 20pF, 20pF
- Current - Leakage (IS(off)) (Max):
- 100pA
- Crosstalk:
- -84dB @ 1MHz
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN (4x4)
MAX4749ETE FAQ
1.How can I place an order for MAX4749ETE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4749ETE 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 MAX4749ETE reliable?
The price and inventory of MAX4749ETE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4749ETE is usually 5 days.
3.What payment methods are accepted for MAX4749ETE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4749ETE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4749ETE?
MAX4749ETE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4749ETE 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 MAX4749ETE?
For technical support, including MAX4749ETE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4749ETE requirements.
6.How does Aetrix verify that MAX4749ETE is sourced from the original manufacturer or authorized distributors?
All MAX4749ETE 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 MAX4749ETE meets industry standards.
7.What is the process for return or replacement of MAX4749ETE?
All MAX4749ETE units undergo pre-shipment inspection (PSI). If there is an issue with MAX4749ETE, 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 MAX4749ETE part is unused and in its original packaging.
Return procedure for MAX4749ETE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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