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Analog Devices Inc./Maxim Integrated MAX4742EKA+T
- Part No.:
- MAX4742EKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX4742EKA+T.pdf
- Description:
- IC SWITCH DUAL SPST SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,380
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Product details
Overview
MAX4742EKA+T from Maxim Integrated is a dual normally closed (NC) single-pole/single-throw (SPST) analog switch 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. It enables low-loss signal routing in battery-powered audio/video systems and portable data-acquisition circuits.
For engineers reviewing the MAX4742EKA+T datasheet, MAX4742EKA+T pinout, MAX4742EKA+T application, or MAX4742EKA+T 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 footprint for space-constrained PCB layouts.
Technical Context
The MAX4742EKA+T implements two independent NC SPST switches using CMOS process technology, enabling bidirectional analog signal switching across the full GND-to-V+ range. Its break-after-make architecture prevents momentary shorting during state transitions, unlike the MAX4743's break-before-make configuration.
Each channel delivers matched on-resistance (0.08Ω max matching) and flat on-resistance (0.18Ω max flatness) over the analog input range, ensuring minimal signal distortion in precision routing applications. Logic inputs tolerate up to +3.6V regardless of V+, supporting mixed-voltage control interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-Resistance (RON) | 0.8Ω max at +3V supply - enables low insertion loss for 150mA continuous analog signals |
| On-Resistance Matching (∆RON) | 0.08Ω max - ensures consistent gain/attenuation between dual channels in differential or parallel paths |
| Turn-On Time (tON) | 24ns max - supports high-speed multiplexing in >10MHz bandwidth applications |
| Analog Signal Range | Rail-to-rail (GND to V+) - preserves full dynamic range of baseband audio, sensor, and data signals |
| Logic Compatibility | 1.8V CMOS compatible at +3V supply - interfaces directly with modern low-voltage microcontrollers |
| Supply Voltage Range | +1.6V to +3.6V - supports operation across single-cell Li-ion, NiMH, and regulated 1.8V/2.5V/3.3V rails |
| Off-Leakage Current | ±5nA max - minimizes DC error in high-impedance sensor front-ends and precision measurement paths |
Pinout & Package
The MAX4742EKA+T is housed in an 8-pin SOT23-8 package (package code K8S-3), measuring 3.0mm × 3.0mm × 1.45mm, with exposed pad not electrically connected. This thermally enhanced surface-mount package supports reflow soldering and delivers 602mW power dissipation at +70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | NO1 / NO2 (Not connected) | Unused pins - left unconnected per MAX4742 NC-only topology; no internal connection |
| 2, 7 | COM1 / COM2 | Common analog terminals - serve as bidirectional signal ports for both NC switches |
| 3, 6 | IN2 / IN1 | Digital control inputs - active-high logic drives NC path open (high = off, low = on) |
| 4, 5 | GND / NC2 | Ground reference and NC2 terminal - Pin 5 is NC2 (normally closed analog output), Pin 4 is GND |
| V+ | Positive supply | Single power rail - powers analog switch core and logic interface; bypass with 0.1µF to GND |
Key Features
| Feature | Design Value |
|---|---|
| Dual NC SPST topology | Ensures default-closed signal path - critical for fail-safe power routing and standby-mode continuity |
| 0.18Ω RON flatness | Maintains consistent on-resistance across full 0–3.6V analog swing - reduces harmonic distortion in audio paths |
| 150mA continuous current rating | Supports direct switching of sensor bias currents, LED drivers, and low-power transducer loads without external buffering |
| Charge injection ≤28pC | Minimizes voltage glitch on COM node during switching - essential for sample-and-hold and ADC front-end integrity |
| Off-isolation –55dB at 1MHz | Suppresses crosstalk between active and inactive channels - preserves signal integrity in multi-channel mux designs |
Applications
| Power Routing | Audio Signal Routing |
|---|---|
Use Scenario: Selecting between primary and backup power sources in portable medical monitors. IC Role / Device Role / Timing Role: Dual NC switch provides default-connected main supply; control logic opens path only during fault or switchover. Use Value: Eliminates need for external pull-downs or latching circuitry while guaranteeing uninterrupted power during normal operation. |
Use Scenario: Muting/unmuting stereo line outputs in Bluetooth headphones. IC Role / Device Role / Timing Role: NC configuration ensures audio passes through by default; mute activated by pulling INx high. Use Value: Prevents pop/click artifacts during power-up and enables zero-latency mute response (<24ns). |
| Battery-Powered Data Acquisition | Communications Circuit Protection |
Use Scenario: Isolating unused sensor inputs in handheld environmental analyzers. IC Role / Device Role / Timing Role: NC switches maintain low-impedance connection to active sensors; open only during calibration or sleep mode. Use Value: Reduces system quiescent current to <0.2µA while preserving signal path readiness for rapid wake-up sampling. |
Use Scenario: Protecting RS-232 transceiver inputs from ESD events in industrial modems. IC Role / Device Role / Timing Role: NC path routes signal by default; transient overvoltage triggers control logic to open path within nanoseconds. Use Value: Combines low on-resistance signal path with fast isolation (<16ns tOFF) to prevent latch-up during surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual analog switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4743EKA+T | One NO + one NC switch; includes break-before-make timing (6ns typical) | Required where simultaneous disconnection before connection is mandatory (e.g., relay replacement) | Select when crosspoint switching or signal path isolation sequencing is needed |
| TMUX1574RTER | 0.5Ω max RON at 3.3V; 1.2V–3.6V supply; no guaranteed NC default state | Used in ultra-low-RON applications but requires external pull resistors to enforce default state | Choose for lower on-resistance where board area allows added passives and timing constraints permit |
Compared with MAX4742EKA+T, the MAX4743EKA+T provides controlled break-before-make transition for safe signal path reconfiguration, while the TMUX1574RTER offers lower RON but lacks inherent NC fail-safe behavior-requiring design-level mitigation for default-state reliability.
Availability
MAX4742EKA+T 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 industrial temperature ranges (–40°C to +85°C).
Supply support for MAX4742EKA+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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX4742EKA+T belongs to the MAX4741/MAX4742/MAX4743 family of low-voltage dual SPST analog switches, engineered specifically for rail-to-rail signal integrity and ultra-low power consumption in portable and battery-critical systems.
FAQ
What is the default switch state of MAX4742EKA+T?
The MAX4742EKA+T features two normally closed (NC) SPST switches. When the digital control inputs (IN1, IN2) are low (≤0.5V), both switches conduct - connecting COM1 to NC1 and COM2 to NC2. Pulling either INx high (>1.4V) opens that respective NC path. This default-closed behavior ensures signal continuity during power-up or control failure.
Does MAX4742EKA+T support rail-to-rail analog signals?
Yes, the MAX4742EKA+T supports rail-to-rail analog signals from GND to V+ across its entire specified supply range (+1.6V to +3.6V). At +3V supply, on-resistance remains stable (≤0.8Ω) and flat (≤0.18Ω variation) over the full 0–3V input range, enabling accurate switching of baseband audio, sensor outputs, and data signals without clipping or distortion.
Can MAX4742EKA+T be used with a 1.8V supply?
Yes, the MAX4742EKA+T operates down to +1.6V supply. At +1.8V, it delivers ≤2.5Ω max on-resistance and maintains 25ns max turn-on time. Logic inputs accept 1.0V VIH and 0.4V VIL thresholds, making it compatible with 1.8V CMOS controllers. However, RON increases versus +3V operation, affecting insertion loss in high-current paths.
What is the thermal performance of the SOT23-8 package for MAX4742EKA+T?
The MAX4742EKA+T in SOT23-8 (K8S-3) package has a power dissipation limit of 602mW at +70°C ambient, derating linearly at 7.52mW/°C above that temperature. With typical quiescent current <0.2µA and RON-induced losses under 150mA load, junction temperature rise remains minimal - enabling reliable operation in sealed enclosures without forced airflow.
How does charge injection affect MAX4742EKA+T in sample-and-hold circuits?
The MAX4742EKA+T specifies ≤28pC maximum charge injection at +3V supply. In sample-and-hold applications, this injects ≤28mV error into a 1nF hold capacitor - manageable with proper capacitor sizing and settling time allowance. For sub-10mV accuracy, use smaller hold capacitors or add post-switching blanking intervals, as confirmed in Figure 3 test circuit.
MAX4742EKA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Switch Circuit:
- SPST - Closed
- 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:
- 20-SSOP
MAX4742EKA+T FAQ
1.How can I place an order for MAX4742EKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4742EKA+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 MAX4742EKA+T reliable?
The price and inventory of MAX4742EKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4742EKA+T is usually 5 days.
3.What payment methods are accepted for MAX4742EKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4742EKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4742EKA+T?
MAX4742EKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4742EKA+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 MAX4742EKA+T?
For technical support, including MAX4742EKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4742EKA+T requirements.
6.How does Aetrix verify that MAX4742EKA+T is sourced from the original manufacturer or authorized distributors?
All MAX4742EKA+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 MAX4742EKA+T meets industry standards.
7.What is the process for return or replacement of MAX4742EKA+T?
All MAX4742EKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4742EKA+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 MAX4742EKA+T part is unused and in its original packaging.
Return procedure for MAX4742EKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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