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Analog Devices Inc./Maxim Integrated MAX4646EUT
- Part No.:
- MAX4646EUT
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX4646EUT.pdf
- Description:
- SPDT ANALOG SWITCH
- Quantity:
- Payment:
- Shipping:
Inventory:3,789
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Product details
Overview
MAX4646EUT from Maxim Integrated is a normally closed (NC) single-pole, single-throw (SPST) CMOS analog switch optimized for low-distortion signal routing. It delivers 2.5Ω typical on-resistance at +5V supply, 0.4Ω max on-resistance flatness over rail-to-rail signal range (0V to V+), and 8ns turn-off time - enabling high-fidelity audio switching and precision data-acquisition paths in battery-powered systems.
For engineers reviewing the MAX4646EUT datasheet, MAX4646EUT pinout, MAX4646EUT application, or MAX4646EUT equivalent, key selection criteria include guaranteed RON ≤2.5Ω at 5V, ±0.25nA max off-leakage at +25°C, TTL/CMOS logic compatibility, -75dB off-isolation at 1MHz, and SOT23-5 package compatibility with space-constrained PCB layouts.
Technical Context
The MAX4646EUT implements a fully complementary CMOS transmission-gate architecture, supporting rail-to-rail analog signal handling from GND to V+ without clamping diodes limiting dynamic range. Its logic-controlled NC configuration ensures default-closed operation with active-low control input, simplifying fail-safe signal path design in power-sensitive applications.
Operating from +1.8V to +5.5V single supply, it maintains stable RON flatness (≤0.4Ω) and ultra-low leakage (±0.25nA) across -40°C to +85°C, while achieving 12ns tON/8ns tOFF switching with 5pC charge injection - critical for sample-and-hold accuracy and low-THD (<0.014%) audio routing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-Resistance (RON) | 2.5Ω typ at V+ = 5V - enables <10mV drop at 10mA signal current, preserving signal integrity in precision sensor interfaces |
| On-Resistance Flatness | 0.4Ω max - ensures consistent gain and minimal harmonic distortion across full 0V–V+ analog input range |
| Turn-Off Time (tOFF) | 8ns typ - supports >100MHz switching in high-speed multiplexing and test equipment signal paths |
| Off-Leakage Current | ±0.25nA max at +25°C - prevents DC error accumulation in high-impedance sample-and-hold or medical front-end circuits |
| Off-Isolation | -75dB at 1MHz - suppresses crosstalk between adjacent channels in multi-signal audio/video routing |
| Supply Voltage Range | +1.8V to +5.5V - allows direct integration into Li-ion (3.0–4.2V) and USB-powered (5V) portable systems |
| Total Harmonic Distortion | 0.014% typ - meets fidelity requirements for line-level audio switching without post-processing compensation |
Pinout & Package
SOT23-5 package: 2.9mm × 1.6mm footprint, 1.1mm height, surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Logic Control Input | Active-low digital input; drives internal gate bias - connects directly to MCU GPIO or FPGA output without level-shifting |
| 2 - NO | Normally Open Terminal | Unconnected when IN = low; open-circuit state eliminates signal path loading during NC operation |
| 3 - GND | Analog/Digital Ground | Common reference for all analog signals and logic inputs - must be low-impedance star point to minimize noise coupling |
| 4 - COM | Common Analog Terminal | Signal source or load connection point - handles rail-to-rail voltages (0V to V+) with no external clamping required |
| 5 - V+ | Positive Supply | +1.8V to +5.5V analog/digital supply - requires local 0.1µF bypass capacitor to GND for stable switching performance |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-Rail Signal Handling | Supports analog inputs from GND to V+ without clipping or distortion - eliminates need for external level-shifting in mixed-supply systems |
| TTL/CMOS Logic Compatibility | Accepts 0.8V/2.4V logic thresholds at 5V supply - interoperates directly with standard microcontrollers and FPGAs |
| Low Charge Injection (5pC) | Minimizes voltage glitch on sampled nodes - critical for maintaining accuracy in 12-bit+ data acquisition systems |
| Guaranteed RON Flatness | 0.4Ω max variation across full signal range - ensures linear transfer function in precision instrumentation amplifier front-ends |
| Ultra-Low Off-Leakage | ±0.25nA max at +25°C - preserves capacitor charge in long-duration sample-and-hold circuits (>1s hold time) |
Applications
| Audio Signal Routing | Portable Data Acquisition |
|---|---|
Use Scenario: Switching between microphone inputs and line outputs in Bluetooth headsets and voice-controlled IoT devices. IC Role / Device Role / Timing Role: NC analog switch providing default-connected audio path; breaks connection only during active mute or channel change. Use Value: 0.014% THD and -75dB off-isolation prevent audible artifacts and crosstalk in stereo audio paths operating at 3.3V. |
Use Scenario: Multiplexing sensor outputs (thermocouple, RTD, strain gauge) into a single ADC channel in handheld test meters. IC Role / Device Role / Timing Role: Low-leakage SPST switch isolating high-impedance sensor nodes during sampling to avoid measurement drift. Use Value: ±0.25nA off-leakage ensures <1µV error in 1MΩ sensor interface at room temperature over 100ms sampling intervals. |
| Sample-and-Hold Circuits | Relay Replacement |
Use Scenario: Capturing fast transient waveforms in oscilloscope front-ends and power quality analyzers. IC Role / Device Role / Timing Role: Precision hold switch with minimal charge injection, placed between buffer amplifier and hold capacitor. Use Value: 5pC charge injection limits hold-step error to <5mV on 1nF capacitor - enabling accurate 12-bit digitization of 100kHz signals. |
Use Scenario: Replacing electromechanical relays in automated test equipment (ATE) fixture control and programmable load banks. IC Role / Device Role / Timing Role: Solid-state NC switch delivering fail-safe closed path until commanded open by controller. Use Value: 2.5Ω RON and 8ns tOFF enable sub-microsecond path reconfiguration - improving ATE throughput by >3× vs. mechanical relays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SPST analog switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADG849BRMZ | 0.5Ω max RON at 3V, but only rated to +85°C; no guaranteed RON flatness spec | Better RON for low-voltage precision, but lacks MAX4646EUT's -75dB off-isolation and rail-to-rail capability at 5V | Select ADG849BRMZ only if system operates ≤3.3V and prioritizes lowest possible on-resistance over isolation and wide supply range |
| TS5A23157DCKR | 2.2Ω max RON at 5V, but 100nA max off-leakage - 400× higher than MAX4646EUT's ±0.25nA | Suitable for general-purpose switching where leakage is non-critical, but unsuitable for high-Z sample-and-hold or medical sensing | Choose TS5A23157DCKR for cost-sensitive consumer electronics; avoid in precision analog or battery-operated long-hold applications |
Compared with ADG849BRMZ and TS5A23157DCKR, the MAX4646EUT uniquely balances ultra-low leakage, high off-isolation, and guaranteed RON flatness across its full 1.8V–5.5V supply range - making it the only option among the three qualified for battery-powered medical sensors and high-fidelity audio routing.
Availability
MAX4646EUT is available at Aetrix Electronics and suitable for battery-powered systems, audio signal routing, low-voltage data-acquisition systems, sample-and-hold circuits, and relay replacement applications requiring stable component supply across industrial temperature ranges.
Supply support for MAX4646EUT 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 high-performance analog, mixed-signal, and power-management ICs for demanding industrial, communications, and consumer applications.
The MAX4645/MAX4646 product line targets low-voltage, low-distortion analog switching in portable and precision instrumentation - emphasizing rail-to-rail operation, nanoscale leakage control, and fast, reliable solid-state replacement of mechanical relays.
FAQ
What is the maximum supply voltage rating for the MAX4646EUT?
The MAX4646EUT has an absolute maximum supply voltage (V+) of +6V, but its specified operational range is +1.8V to +5.5V. Operating beyond +5.5V risks exceeding absolute maximum ratings and may cause permanent damage. The device achieves optimal RON (2.5Ω typ) and leakage performance within the +4.5V to +5.5V range per the datasheet's electrical characteristics table.
Does the MAX4646EUT require external protection diodes for overvoltage conditions?
No, the MAX4646EUT does not require external protection diodes under normal operation. Its internal ESD protection and absolute maximum ratings (e.g., COM/NO/NC to GND: -0.3V to V+ + 0.3V) suffice for compliant signal routing. However, Maxim recommends adding two series diodes on V+ if overvoltage transients >6V are expected - though this reduces usable analog swing by ~1.4V and is not needed for standard 5V or 3.3V system use cases involving the MAX4646EUT.
How does the MAX4646EUT differ from the MAX4645EUT in functionality?
The MAX4646EUT is a normally closed (NC) SPST switch, meaning COM is connected to NC when the IN pin is logic low (0V), and disconnected when IN is high (V+). In contrast, the MAX4645EUT is normally open (NO): COM connects to NO only when IN is high. Both share identical RON, leakage, speed, and package specs, but their truth tables and default states are inverted - making MAX4646EUT ideal for fail-safe closed-path applications like emergency audio pass-through or default sensor monitoring.
Can the MAX4646EUT operate reliably at 1.8V supply?
Yes, the MAX4646EUT is fully specified down to +1.8V supply, with RON = 30Ω typ over temperature and tON/tOFF = 40ns/20ns typ. While RON increases versus 5V operation, its rail-to-rail capability, ±0.25nA leakage, and logic compatibility remain valid - enabling direct integration into single-cell Li-ion (2.7–4.2V) and energy-harvesting systems where 1.8V logic domains coexist with analog sensors.
What is the thermal resistance (θJA) of the MAX4646EUT in SOT23-5 package?
The MAX4646EUT in SOT23-5 package has a junction-to-ambient thermal resistance (θJA) of 140°C/W, derived from its 571mW maximum power dissipation at +70°C ambient and 7.1mW/°C derating above that temperature. This value assumes standard JEDEC 2-layer board layout; actual θJA improves with added copper pour or thermal vias. At 10mA load current and 2.5Ω RON, power dissipation remains <0.25mW - well below thermal limits under all operating conditions.
MAX4646EUT 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:
- 1
- On-State Resistance (Max):
- 2.5Ohm
- Channel-to-Channel Matching (ΔRon):
- 100mOhm
- Voltage - Supply, Single (V+):
- 1.8V ~ 5V
- Voltage - Supply, Dual (V±):
- -
- Switch Time (Ton, Toff) (Max):
- 15ns, 10ns
- -3db Bandwidth:
- -
- Charge Injection:
- 5pC
- Channel Capacitance (CS(off), CD(off)):
- 17pF, 17pF
- Current - Leakage (IS(off)) (Max):
- 250pA
- Crosstalk:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
MAX4646EUT FAQ
1.How can I place an order for MAX4646EUT through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4646EUT 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 MAX4646EUT reliable?
The price and inventory of MAX4646EUT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4646EUT is usually 5 days.
3.What payment methods are accepted for MAX4646EUT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4646EUT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4646EUT?
MAX4646EUT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4646EUT 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 MAX4646EUT?
For technical support, including MAX4646EUT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4646EUT requirements.
6.How does Aetrix verify that MAX4646EUT is sourced from the original manufacturer or authorized distributors?
All MAX4646EUT 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 MAX4646EUT meets industry standards.
7.What is the process for return or replacement of MAX4646EUT?
All MAX4646EUT units undergo pre-shipment inspection (PSI). If there is an issue with MAX4646EUT, 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 MAX4646EUT part is unused and in its original packaging.
Return procedure for MAX4646EUT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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