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Analog Devices Inc./Maxim Integrated MAX4742EKA-T
- Part No.:
- MAX4742EKA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-8
- Datasheet:
-
MAX4742EKA-T.pdf
- Description:
- IC SW SPST-NCX2 800MOHM SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
MAX4742EKA-T 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, 16ns turn-off time, and 150mA continuous current handling per channel-used for low-voltage power routing and signal switching in battery-powered audio/video systems.
For engineers reviewing the MAX4742EKA-T datasheet, MAX4742EKA-T pinout, MAX4742EKA-T application, or MAX4742EKA-T equivalent, this page delivers verified electrical specs, SOT23-8 package mapping, NC-switch topology confirmation, rail-to-rail analog signal support, and real-world selection guidance against functionally aligned alternatives.
Technical Context
The MAX4742EKA-T implements two independent CMOS-based normally closed analog switches with break-after-make behavior, enabling safe signal path disconnection before reconfiguration. Its 1.8V CMOS-compatible logic inputs accept rail-to-rail control signals up to +3.6V regardless of V+ level.
Each channel supports bidirectional rail-to-rail analog signals (GND to V+), exhibits 0.08Ω max RON matching and 0.18Ω max RON flatness at +3V, and maintains sub-5nA leakage across -40°C to +85°C-critical for precision low-power data acquisition and portable communications circuits.
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-minimizes voltage drop and power loss in high-current analog paths up to 150mA. |
| Turn-On/Off Time | tON = 24ns, tOFF = 16ns max-supports fast multiplexing in audio routing and high-speed data-acquisition front-ends. |
| RON Matching | 0.08Ω max between channels-ensures matched gain/attenuation in differential or dual-path signal conditioning. |
| Logic Compatibility | 1.8V CMOS input threshold at +3V supply-simplifies interface with modern low-voltage microcontrollers and FPGAs. |
| Leakage Current | ±5nA max COM/NC off-leakage at TA = -40°C to +85°C-preserves signal integrity in high-impedance sensor interfaces. |
| Bandwidth | 100MHz -3dB on-channel bandwidth-supports video and broadband communication signals without distortion. |
Pinout & Package
MAX4742EKA-T is housed in an 8-pin SOT23-8 package (package code K8S-3), measuring 4.9mm × 6.0mm × 1.75mm, with gull-wing leads and exposed pad not present. Pin 1 is marked by a dot or beveled edge.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | V+ | Positive supply input-must be powered before analog signals to prevent latch-up; bypass with 0.1µF to GND. |
| 2 | IN1 | Logic control input for Switch 1-driving low closes NC1 path; high opens it (active-low control). |
| 3 | NC2 | Analog terminal for Switch 2 normally closed path-connects to COM2 when IN2 = low. |
| 4 | GND | Ground reference for supply and logic-requires low-impedance connection to minimize noise coupling. |
| 5 | COM2 | Common node for Switch 2-bidirectional; carries full analog signal current up to 150mA. |
| 6 | IN2 | Logic control input for Switch 2-identical timing and voltage thresholds as IN1. |
| 7 | COM1 | Common node for Switch 1-shares same electrical characteristics and thermal limits as COM2. |
| 8 | NC1 | Analog terminal for Switch 1 normally closed path-connects to COM1 when IN1 = low. |
Key Features
| Feature | Design Value |
|---|---|
| Dual NC topology | Ensures default-closed signal path-ideal for fail-safe power gating and always-on monitoring circuits. |
| Rail-to-rail analog operation | Supports full V+ to GND signal swing without clipping-enables direct interfacing with ADCs, DACs, and op-amps. |
| Ultra-low quiescent power | <1µW typical supply current-extends battery life in portable medical, wearables, and IoT endpoints. |
| Low charge injection (28pC) | Minimizes voltage glitch during switching-critical for precision sampling in data converters and sensor front-ends. |
| High off-isolation (-55dB) | Prevents crosstalk between active and inactive channels-essential for multi-source audio/video routing. |
Applications
| Power Routing | Battery-Powered Audio Systems |
|---|---|
Use Scenario: Selecting between primary and backup power rails in handheld test equipment. IC Role / Device Role / Timing Role: Dual NC switch isolates backup rail until primary fails; fast tOFF ensures seamless switchover. Use Value: Eliminates need for external diodes or controllers-reduces BOM count and PCB area while maintaining <1µW standby draw. |
Use Scenario: Muting/unmuting left/right audio channels in Bluetooth headsets during call transitions. IC Role / Device Role / Timing Role: NC configuration provides default audio path; logic-controlled opening mutes output without pop/click. Use Value: 28pC charge injection and 0.18Ω RON flatness prevent audible artifacts during dynamic volume control. |
| Low-Voltage Data Acquisition | PCMCIA/CompactFlash Interface Switching |
Use Scenario: Multiplexing thermistor and photodiode signals into a shared ADC input in environmental sensors. IC Role / Device Role / Timing Role: Dual NC switches route high-impedance analog sources with minimal loading; matched RON preserves ratio accuracy. Use Value: ±5nA leakage and 0.08Ω RON matching enable sub-0.1% measurement error across temperature ranges. |
Use Scenario: Isolating host controller I/O lines from PCMCIA card slots during hot-plug events. IC Role / Device Role / Timing Role: NC path maintains signal continuity until card insertion triggers INx high to open isolation. Use Value: 150mA current rating and -55dB off-isolation protect host logic from ESD and card-induced transients. |
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-T | One NO + one NC channel vs. MAX4742EKA-T's dual NC-break-before-make timing guaranteed. | Required where sequential path switching (e.g., relay replacement) demands guaranteed isolation gap. | Select MAX4743EKA-T only if mixed NO/NC topology and tBBM ≥1ns are mandatory; otherwise MAX4742EKA-T offers simpler control. |
| TMUX1574DQAR | Lower RON (0.5Ω typ), wider supply (1.08–3.6V), but higher leakage (±20nA) and no guaranteed tBBM. | Better for ultra-low-loss signal chains; less suitable for precision low-leakage sensor muxing. | Choose TMUX1574DQAR when RON reduction outweighs leakage sensitivity; verify layout for 0.5pF lower COFF. |
Compared with MAX4743EKA-T and TMUX1574DQAR, MAX4742EKA-T uniquely balances dual NC safety, sub-5nA leakage, and proven 0.8Ω RON stability across -40°C to +85°C-making it optimal for battery-critical, fail-safe analog routing where default closure is non-negotiable.
Availability
MAX4742EKA-T is available at Aetrix Electronics and suitable for battery-powered audio systems, low-voltage data-acquisition systems, and PCMCIA interface switching requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
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 industrial, medical, and portable electronics.
The MAX474x family targets low-voltage, low-power analog signal routing-specifically engineered for rail-to-rail performance, ultra-low leakage, and robust operation in space-constrained battery-powered devices.
FAQ
What is the maximum continuous current rating per channel for MAX4742EKA-T?
The MAX4742EKA-T supports 150mA continuous current through each COM/NC path under +3V supply and +85°C ambient conditions. This rating is validated per Absolute Maximum Ratings and confirmed in Electrical Characteristics tables-exceeding this current risks thermal shutdown or parametric shift. Derating is required above +70°C ambient per the 7.52mW/°C thermal resistance of the SOT23-8 package.
Does MAX4742EKA-T support rail-to-rail analog signal switching?
Yes, MAX4742EKA-T fully supports rail-to-rail analog signals from GND to V+ across its entire operating supply range (+1.6V to +3.6V). This is enabled by CMOS switch architecture and confirmed in the Analog Signal Range specification (0 to V+ volts) and Typical Operating Characteristics plots showing RON stability over full VCOM swing.
What logic voltage levels are compatible with MAX4742EKA-T inputs?
MAX4742EKA-T logic inputs accept 1.8V CMOS-compatible thresholds when V+ = +3V (VIH = +1.4V min, VIL = +0.5V max), and scale down to VIH = +1.0V min at +1.8V supply. Critically, inputs tolerate up to +3.6V regardless of V+, allowing direct interfacing with higher-voltage controllers without level shifters.
Is MAX4742EKA-T pin-compatible with MAX4741EKA-T or MAX4743EKA-T?
No-while all three share the same SOT23-8 footprint and pin numbering, their internal switch configurations differ: MAX4742EKA-T has dual NC, MAX4741EKA-T dual NO, and MAX4743EKA-T mixed NO/NC. Swapping them requires logic inversion and may compromise fail-safe behavior; no pin-to-pin functional replacement exists within this family.
What is the typical charge injection value for MAX4742EKA-T, and why does it matter?
MAX4742EKA-T specifies 28pC typical charge injection at +3V supply. This parameter quantifies transient voltage glitch injected into high-impedance nodes (e.g., ADC sample capacitors or sensor outputs) during switching. Low charge injection prevents measurement errors and audible pop in audio paths-verified in Figure 3 of the datasheet under standardized test conditions.
MAX4742EKA-T 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-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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