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Analog Devices Inc./Maxim Integrated MAX4742EUA
- Part No.:
- MAX4742EUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4742EUA.pdf
- Description:
- IC SW SPST-NCX2 800MOHM 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:11,207
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Product details
Overview
MAX4742EUA 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 serves as a low-voltage signal routing device in battery-powered audio/video paths and data-acquisition front-ends.
For engineers reviewing the MAX4742EUA datasheet, MAX4742EUA pinout, MAX4742EUA application, or MAX4742EUA equivalent, key selection criteria include NC-switch topology, rail-to-rail analog signal support, µMAX-8 package compatibility, 1.8V CMOS logic interface, and break-before-make absence-critical for power sequencing and analog path integrity in portable systems.
Technical Context
The MAX4742EUA implements two independent CMOS-based NC switches with bidirectional analog signal capability across GND to V+. Its control logic accepts 1.8V-compatible inputs when powered from +3V, enabling direct interfacing with low-voltage microcontrollers without level shifting.
Each switch exhibits tightly matched on-resistance (0.08Ω max matching) and flatness (0.18Ω max), ensuring minimal gain error and THD of 0.02% over 20Hz–20kHz. No internal break-before-make circuitry is present-unlike the MAX4743-making it suitable for applications requiring simultaneous conduction during state transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-resistance (RON) | 0.8Ω max at +3V supply - enables <10mV drop at 12.5mA, supporting precision signal routing |
| RON matching | 0.08Ω max - ensures ≤0.1% gain mismatch between channels in differential or dual-path designs |
| Turn-on time (tON) | 24ns max - supports >10MHz switching in multiplexed data acquisition and high-speed audio routing |
| Analog signal range | Rail-to-rail (GND to V+) - preserves full dynamic range of baseband audio and sensor signals |
| Supply voltage range | +1.6V to +3.6V - compatible with Li-ion, Li-poly, and single-cell alkaline/battery systems |
| Logic input compatibility | 1.8V CMOS at +3V supply - eliminates need for external level shifters when driven by 1.8V I/O microcontrollers |
| Continuous current rating | ±150mA per channel - sufficient for driving headphones, small relays, or ADC input buffers |
Pinout & Package
The MAX4742EUA is housed in an 8-pin µMAX package (U8-1), measuring 3.05mm × 3.05mm × 1.05mm, with exposed pad for thermal enhancement and standard SOIC footprint compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | NO1 / NO2 (Not connected) | Unused pins - left unconnected; no internal connection to switch elements |
| 2, 7 | COM1 / COM2 | Common analog terminals - serve as bidirectional signal ports for NC-switch paths |
| 3, 6 | IN2 / IN1 | Digital control inputs - active-high logic; low = NC closed, high = NC open |
| 4, 5 | GND | Analog/digital ground reference - must be low-impedance and tied to system ground plane |
| 5, 3 | NC2 / NC1 | Normally closed analog terminals - conduct to COMx when corresponding INx is low |
| 7, 1 | V+ | Positive supply - requires local 0.1µF bypass capacitor to GND for noise suppression |
Key Features
| Feature | Design Value |
|---|---|
| Dual NC topology | Ensures default-closed signal path during power-up or logic fault, enhancing safety in power routing and fail-safe audio mute |
| 0.18Ω RON flatness | Maintains consistent insertion loss across full analog signal swing (0V to V+), critical for linearity in audio and sensor interfaces |
| 1.8V CMOS-compatible inputs | Allows direct connection to 1.8V FPGA I/O or microcontroller GPIO without level-shifting circuitry, reducing BOM count |
| 2.5Ω RON max at +1.8V | Supports operation down to single-cell lithium primary batteries while retaining usable on-resistance for low-power sensing |
| −110dB crosstalk | Prevents coupling between adjacent switched channels in multi-source audio or instrumentation multiplexing |
Applications
| Audio Signal Muting | Battery Power Path Control |
|---|---|
Use Scenario: Muting speaker outputs during boot-up or mode transitions in Bluetooth headsets and portable media players. IC Role / Device Role / Timing Role: Dual NC switch providing default-conductive path that opens only upon firmware command, acting as hardware-enforced mute gate. Use Value: Eliminates pop/click artifacts by guaranteeing silent default state and enabling precise timing-controlled muting via 24ns-fast digital control. | Use Scenario: Selecting between main battery and backup coin cell in medical wearables and IoT sensors with ultra-low quiescent current requirements. IC Role / Device Role / Timing Role: Low-RON NC switch isolating backup supply until main battery fails, functioning as automatic power source selector. Use Value: 0.8Ω max RON minimizes voltage drop and power loss (<1.2mW at 10mA), extending runtime while maintaining rail-to-rail voltage delivery to MCU. |
| Low-Voltage Data Acquisition Multiplexing | PCMCIA/CardBus Interface Switching |
Use Scenario: Routing multiple sensor outputs (thermistor, accelerometer, ambient light) to a shared ADC in handheld diagnostic tools. IC Role / Device Role / Timing Role: Dual NC analog switch enabling simultaneous sampling of two sensors or sequential channel selection with guaranteed open-circuit isolation. Use Value: 0.08Ω RON matching ensures <0.1% gain tracking error between channels, preserving measurement accuracy across temperature ranges. | Use Scenario: Isolating host-side I/O lines from PCMCIA card slots during hot-plug events in industrial laptops and ruggedized field computers. IC Role / Device Role / Timing Role: NC switch placed in series with card bus lines, closing by default to maintain connectivity and opening only during card removal detection. Use Value: −110dB crosstalk and <5nA off-leakage prevent signal corruption and leakage-induced false interrupts during slot standby. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-NC analog switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4743EUA | Contains one NO and one NC switch; includes break-before-make timing (6ns typ) | Suitable where channel isolation during transition is mandatory (e.g., relay driver control) | Select MAX4743EUA only if break-before-make behavior is required; MAX4742EUA provides simpler NC-only control without timing constraints |
| TMUX1574RSVR | Single-supply +1.08V to +3.6V; 0.5Ω RON at +3V; 1.2V logic compatible; no NC configuration | Requires external pull-down to emulate NC behavior; lacks native NC topology | Choose TMUX1574RSVR only when lower RON or wider supply range outweighs need for true NC default state |
Compared with MAX4743EUA and TMUX1574RSVR, the MAX4742EUA uniquely delivers dual-native NC functionality with guaranteed default-closed operation, eliminating external biasing and simplifying fail-safe design-making it optimal for battery path control and hardware-mute applications where power-up state determinism is essential.
Availability
MAX4742EUA 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 extended production lifecycles.
Supply support for MAX4742EUA 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 industrial, communications, and consumer applications.
The MAX474x family targets low-voltage, low-RON analog switching in space-constrained portable electronics-emphasizing rail-to-rail signal integrity, ultra-low power, and robust single-supply operation.
FAQ
What is the default state of the switches in MAX4742EUA?
The MAX4742EUA features two normally closed (NC) analog switches. When the digital control inputs (IN1 and IN2) are low (≤0.5V), each switch conducts between its NC and COM terminals. This default-closed behavior ensures signal continuity during power-up, reset, or logic fault conditions-critical for fail-safe audio muting and battery path control. The MAX4742EUA does not incorporate break-before-make timing, so both switches operate independently without forced isolation during transitions.
Can MAX4742EUA operate from a +1.8V supply, and what performance changes occur?
Yes, the MAX4742EUA operates from +1.6V to +3.6V. At +1.8V supply, on-resistance increases to 2.5Ω max (vs. 0.8Ω at +3V), turn-on/turn-off times extend to 35ns/25ns max, and logic thresholds shift to VIH = +1.0V/VIL = +0.4V. Analog signal range remains rail-to-rail (0V to +1.8V), and leakage currents stay within ±5nA. This makes the MAX4742EUA viable for single-cell lithium primary systems where moderate RON is acceptable for low-current sensor routing.
Does MAX4742EUA support bidirectional analog signal flow?
Yes, the MAX4742EUA supports fully bidirectional analog signal routing. Its CMOS construction allows signals to pass equally well from NC to COM or COM to NC, with identical on-resistance, capacitance, and distortion characteristics in either direction. This enables flexible PCB layout in audio line drivers, differential sensor interfaces, and shared-bus multiplexing-no polarity constraints apply to the NC or COM pins.
What is the thermal performance of MAX4742EUA in the µMAX package?
The MAX4742EUA in the 8-pin µMAX package (U8-1) has a power dissipation limit of 362mW at +70°C, derating at 4.5mW/°C above that temperature. With typical quiescent current below 0.2µA and RON-induced losses under 1.2mW at 10mA, self-heating is negligible in most applications. The exposed pad (though not electrically connected in this variant) aids mechanical stability; thermal design should prioritize low-thermal-resistance PCB copper pour under the package body.
How does MAX4742EUA handle off-isolation and crosstalk in high-density layouts?
The MAX4742EUA achieves −55dB off-isolation and −110dB crosstalk at 1MHz, measured with 50Ω source/load and 5pF parasitic capacitance. These values reflect inherent device performance-not layout-dependent results. To preserve them in practice, maintain ≥0.3mm clearance between NC/COM traces, use ground guard rings around analog paths, and avoid routing sensitive analog lines parallel to digital INx traces. The 32pF off-capacitance (COFF/CCOM_OFF) further limits high-frequency coupling when combined with proper board stackup.
MAX4742EUA 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:
- 8-µMAX
MAX4742EUA FAQ
1.How can I place an order for MAX4742EUA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4742EUA 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 MAX4742EUA reliable?
The price and inventory of MAX4742EUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4742EUA is usually 5 days.
3.What payment methods are accepted for MAX4742EUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4742EUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4742EUA?
MAX4742EUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4742EUA 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 MAX4742EUA?
For technical support, including MAX4742EUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4742EUA requirements.
6.How does Aetrix verify that MAX4742EUA is sourced from the original manufacturer or authorized distributors?
All MAX4742EUA 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 MAX4742EUA meets industry standards.
7.What is the process for return or replacement of MAX4742EUA?
All MAX4742EUA units undergo pre-shipment inspection (PSI). If there is an issue with MAX4742EUA, 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 MAX4742EUA part is unused and in its original packaging.
Return procedure for MAX4742EUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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