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Analog Devices Inc./Maxim Integrated MAX4742EKA
- Part No.:
- MAX4742EKA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-8
- Datasheet:
-
MAX4742EKA.pdf
- Description:
- IC SW SPST-NCX2 800MOHM SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:668
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Product details
Overview
MAX4742EKA from Maxim Integrated is a dual normally closed (NC) SPST analog switch IC operating from a single +1.6V to +3.6V supply, featuring 0.8Ω max on-resistance at +3V, 24ns turn-on time, and 150mA continuous current handling per channel. It enables low-voltage signal routing in battery-powered audio/video systems and portable communications circuits.
For engineers reviewing the MAX4742EKA datasheet, MAX4742EKA pinout, MAX4742EKA application, or MAX4742EKA equivalent, key selection criteria include NC-switch topology, rail-to-rail analog signal support, 1.8V CMOS logic compatibility at +3V supply, and SOT23-8 package thermal performance (602mW at +70°C).
Technical Context
The MAX4742EKA implements two independent CMOS-based SPST switches with normally closed configuration-each channel conducts when its IN_ input is logic low and opens when high. Its architecture supports bidirectional analog signal flow across the full GND-to-V+ range without degradation in RON flatness (0.18Ω max).
Switching dynamics are optimized for low charge injection (28pC typical) and minimal crosstalk (–110dB), enabling high-fidelity signal routing in audio paths and precision data-acquisition front-ends where THD remains below 0.02% over 20Hz–20kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +1.6V to +3.6V single supply - enables direct integration into Li-ion and coin-cell powered systems without level-shifting. |
| On-Resistance (RON) | 0.8Ω max at +3V - supports ≤150mA continuous current per channel with <120mV IR drop at full load. |
| RON Matching | 0.08Ω max between channels - ensures matched gain/attenuation in differential or dual-path signal routing. |
| Turn-On/Off Time | tON = 24ns, tOFF = 16ns max - suitable for high-speed multiplexing in USB 1.1, PCM audio, and sensor interface applications. |
| Logic Compatibility | 1.8V CMOS input thresholds at +3V supply - interfaces directly with 1.8V FPGA I/O and microcontroller GPIO without external translators. |
| Off-Leakage Current | ±5nA max at TMIN to TMAX - preserves signal integrity in high-impedance sensor nodes and battery-monitoring circuits. |
| Bandwidth | 100MHz –3dB on-channel bandwidth - maintains fidelity for video sync signals and baseband RF sampling paths. |
Pinout & Package
MAX4742EKA is housed in an 8-pin SOT23-8 package (package code K8S-3), measuring 3.0mm × 3.0mm × 1.1mm, with 602mW power dissipation capability at +70°C ambient and 7.52mW/°C derating above that temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | NO1 / NO2 (Not connected) | Unused pins - left unconnected per MAX4742 functional definition; no internal connection to switch elements. |
| 2, 7 | COM1 / COM2 | Common analog terminals - bidirectional signal path endpoints; must be routed with controlled impedance for high-frequency signals. |
| 3, 6 | IN2 / IN1 | Digital control inputs - active-low logic: channel closed when IN_ = low (≤0.5V), open when IN_ = high (≥1.4V at +3V). |
| 4, 5 | GND | Analog/digital ground reference - requires low-inductance connection to system ground plane to minimize switching noise coupling. |
| 5, 3 | NC2 / NC1 | Normally closed analog terminals - conduct to COMx when corresponding INx is low; rated for ±150mA continuous current. |
| 7, 1 | V+ | Positive supply input - bypass with 0.1µF ceramic capacitor placed within 2mm of pin to suppress supply transients during switching. |
Key Features
| Feature | Design Value |
|---|---|
| Dual NC-switch topology | Ensures fail-safe signal continuity in power-loss scenarios - critical for battery monitoring and safety-critical sensor paths. |
| Rail-to-rail analog signal handling | Supports full GND-to-V+ signal swing with <0.18Ω RON flatness - eliminates clipping in audio line drivers and ADC front-ends. |
| Ultra-low quiescent power | <1µW supply current - extends runtime in always-on wearable and IoT endpoint devices. |
| Low charge injection (28pC) | Minimizes voltage glitch on high-impedance nodes - essential for precision sample-and-hold and medical sensor interfaces. |
| High off-isolation (–55dB) | Prevents signal bleed between active and inactive channels - maintains SNR >90dB in multi-source audio routing. |
Applications
| Audio Signal Routing | Battery Monitoring Systems |
|---|---|
|
Use Scenario: Switching between multiple microphone inputs or speaker outputs in Bluetooth headsets and voice-controlled wearables. IC Role / Device Role / Timing Role: Dual NC analog switch providing seamless audio path selection with <24ns transition and <0.02% THD. Use Value: Enables zero-crossing mute control and eliminates pop/click artifacts during source switching in real-time audio streams. |
Use Scenario: Isolating individual cell voltages in multi-cell Li-ion battery packs during protection circuit monitoring. IC Role / Device Role / Timing Role: NC-switched analog front-end multiplexer routing cell voltage to ADC while maintaining default conduction path. Use Value: Guarantees uninterrupted voltage sensing during MCU sleep cycles and prevents false overvoltage trips during hot-swap events. |
| PCMCIA Card Interface | Low-Power Data Acquisition |
|
Use Scenario: Enabling/disabling legacy PCMCIA peripheral signals (e.g., memory-mapped I/O, interrupt lines) in industrial handheld terminals. IC Role / Device Role / Timing Role: Dual NC switch isolating card-side buses when card is ejected or powered down. Use Value: Prevents back-driving of host controller I/O during hot-plug removal and meets PCMCIA 2.1 electrical isolation requirements. |
Use Scenario: Multiplexing thermistor, RTD, and strain gauge sensors onto a shared sigma-delta ADC in portable instrumentation. IC Role / Device Role / Timing Role: Low-RON, low-leakage analog switch selecting sensor inputs with <5nA off-state current. Use Value: Maintains measurement accuracy <0.1% FS error across temperature range by minimizing leakage-induced offset drift. |
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 |
|---|---|---|---|
| MAX4743EKA | One NO + one NC channel vs. MAX4742EKA's dual NC - break-before-make timing (6ns typ) guaranteed. | Required where sequential channel switching prevents signal shorting (e.g., relay replacement in telecom line cards). | Select MAX4743EKA only when mixed NO/NC functionality or BBM timing is mandatory; not a drop-in replacement. |
| TMUX1574DBVR | 0.5Ω max RON at 3.3V, but higher 100nA max off-leakage and 3.6V absolute max supply rating. | Better RON for high-current paths, but unsuitable for ultra-low-leakage sensor front-ends or 3.6V operation. | Choose TMUX1574DBVR for cost-sensitive consumer audio where leakage <5nA is non-critical and supply stays ≤3.3V. |
Compared with MAX4742EKA, MAX4743EKA provides mixed switch polarity and guaranteed break-before-make timing but lacks dual NC fail-safe behavior; TMUX1574DBVR offers lower RON yet compromises leakage performance and supply margin, making it less suitable for precision battery monitoring or extended-voltage industrial use.
Availability
MAX4742EKA is available at Aetrix Electronics and suitable for battery-powered systems, audio signal routing, and low-voltage data-acquisition systems requiring stable component supply across automotive-grade temperature ranges (–40°C to +85°C).
Supply support for MAX4742EKA 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, mixed-signal, and power-management ICs for demanding industrial, medical, and communications applications.
The MAX474x family targets low-voltage, low-power analog signal routing in portable and energy-constrained systems, emphasizing rail-to-rail operation, sub-1Ω on-resistance, and nanowatt quiescent power.
FAQ
What is the maximum continuous current rating per channel for MAX4742EKA?
The MAX4742EKA supports ±150mA continuous current per channel at TA ≤ +70°C, verified under V+ = +3.0V and specified across –40°C to +85°C. Derating applies above +70°C ambient (7.52mW/°C), limiting usable current in high-temperature enclosures unless heatsinking is implemented. This rating ensures reliable operation in audio output stages and sensor signal chains without thermal shutdown.
Does MAX4742EKA support rail-to-rail analog signal switching?
Yes, MAX4742EKA fully supports rail-to-rail analog signal switching from GND to V+, with on-resistance flatness maintained at ≤0.18Ω max across the entire signal range when V+ = +3V. This is confirmed in the Electrical Characteristics table and Typical Operating Characteristics (Figure toc01/toc02), enabling distortion-free transmission of full-scale audio, video sync, and sensor signals without clipping or gain variation.
Can MAX4742EKA be used with a 1.8V supply?
Yes, MAX4742EKA operates from +1.6V to +3.6V, and at +1.8V supply, it delivers 2.5Ω max on-resistance and retains 1.8V CMOS-compatible logic thresholds (VIH = +1.0V, VIL = +0.4V). However, dynamic performance degrades: tON increases to 35ns max and RON rises significantly versus +3V operation, making +1.8V suitable only for low-speed, low-current applications like standby sensor polling.
What is the function of pins 1 and 8 on the MAX4742EKA SOT23-8 package?
Pins 1 and 8 on MAX4742EKA are unconnected (NC) - they serve no internal function and must remain floating per the Pin Description table and MAX4742-specific pinout diagram. These pins correspond to NO1 and NO2 terminals, which are unused in the MAX4742 variant (dual NC only); connecting them risks parasitic coupling or ESD path disruption and violates Maxim's recommended layout guidelines.
Is MAX4742EKA pin-compatible with MAX4741EKA or MAX4743EKA in the SOT23-8 package?
No, MAX4742EKA is not pin-compatible with MAX4741EKA or MAX4743EKA despite sharing the SOT23-8 footprint. Pin functions differ: MAX4742EKA assigns pins 5 and 3 to NC2 and NC1, whereas MAX4741EKA uses those pins for NO2 and NO1, and MAX4743EKA uses pin 5 for NC2 but pin 3 for IN2. Swapping parts without PCB revision will result in incorrect signal routing and functional failure.
MAX4742EKA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Switch Circuit:
- SPST - NC
- Multiplexer/Demultiplexer Circuit:
- 1:1
- Number of Circuits:
- 2
- On-State Resistance (Max):
- 800mOhm
- Channel-to-Channel Matching (ΔRon):
- 50mOhm
- Voltage - Supply, Single (V+):
- 1.6V ~ 3.6V
- Voltage - Supply, Dual (V±):
- -
- Switch Time (Ton, Toff) (Max):
- 24ns, 16ns
- -3db Bandwidth:
- 100MHz
- Charge Injection:
- 28pC
- Channel Capacitance (CS(off), CD(off)):
- 32pF, 32pF
- Current - Leakage (IS(off)) (Max):
- 1nA
- Crosstalk:
- -110dB @ 1MHz
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX4742EKA FAQ
1.How can I place an order for MAX4742EKA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4742EKA 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 MAX4742EKA reliable?
The price and inventory of MAX4742EKA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4742EKA is usually 5 days.
3.What payment methods are accepted for MAX4742EKA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4742EKA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4742EKA?
MAX4742EKA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4742EKA 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 MAX4742EKA?
For technical support, including MAX4742EKA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4742EKA requirements.
6.How does Aetrix verify that MAX4742EKA is sourced from the original manufacturer or authorized distributors?
All MAX4742EKA 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 MAX4742EKA meets industry standards.
7.What is the process for return or replacement of MAX4742EKA?
All MAX4742EKA units undergo pre-shipment inspection (PSI). If there is an issue with MAX4742EKA, 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 MAX4742EKA part is unused and in its original packaging.
Return procedure for MAX4742EKA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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