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Analog Devices Inc./Maxim Integrated MAX4645EUA+
- Part No.:
- MAX4645EUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4645EUA+.pdf
- Description:
- IC SWITCH SPST-NOX1 2.5OHM 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:321
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Product details
Overview
MAX4645EUA+ from Maxim Integrated is a single-pole, single-throw (SPST), normally open (NO) 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/video switching in battery-powered instrumentation.
For engineers reviewing the MAX4645EUA+ datasheet, MAX4645EUA+ pinout, MAX4645EUA+ application, or MAX4645EUA+ 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 MAX4645EUA+ uses complementary MOSFET architecture to achieve rail-to-rail analog conduction (GND to V+) with minimal signal-dependent RON variation. Its control logic accepts 1.8V–5V-compatible input thresholds (VIL ≤0.8V, VIH ≥2.4V at 5V supply), ensuring interoperability with mixed-voltage digital systems.
Switching performance is characterized by 12ns tON and 8ns tOFF (VCOM = 3V, RL = 300Ω, CL = 35pF), while charge injection is limited to 5pC (VGEN = 2V, CL = 1.0nF). Off-isolation reaches -75dB at 1MHz, supporting clean channel separation in multiplexed data-acquisition paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-resistance (RON) | 2.5Ω typical at V+ = 5V - ensures minimal voltage drop and signal attenuation in precision analog paths |
| On-resistance flatness | 0.4Ω max over full signal range - maintains consistent gain and linearity across 0V to V+ inputs |
| Turn-off time (tOFF) | 8ns typical - enables fast channel switching in high-speed sampling and multiplexing applications |
| Off-leakage current | ±0.25nA max at +25°C - preserves accuracy in high-impedance sensor interfaces and sample-and-hold circuits |
| Off-isolation | -75dB at 1MHz - suppresses crosstalk between inactive channels in multi-signal routing systems |
| Supply voltage range | +1.8V to +5.5V - supports direct integration into Li-ion (3.3V/3.7V) and USB-powered (5V) portable designs |
| Total harmonic distortion | 0.014% typical - meets fidelity requirements for audio-grade analog signal switching |
Pinout & Package
MAX4645EUA+ is housed in a 5-pin SOT23 package (JEDEC MO-178AA, 2.9mm × 1.6mm × 1.1mm), with pin 1 marked by laser scribing nearest the package edge. The compact footprint supports high-density layout in handheld and IoT edge devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Logic control input | Active-high TTL/CMOS-compatible enable signal; drives internal gate bias for NO switch closure |
| 2 - NO | Normally open analog terminal | Open-circuit when IN = LOW; connects to COM only when IN = HIGH - defines SPST-NO topology |
| 3 - GND | Analog/digital ground reference | Common return path for supply, logic, and analog signals; must be low-impedance to minimize noise coupling |
| 4 - COM | Common analog terminal | Signal hub connecting to NO (when enabled) or NC (in MAX4646 variant); requires rail-to-rail voltage handling |
| 5 - V+ | Positive supply rail | +1.8V to +5.5V analog/digital power source; bypassing with 0.1µF capacitor to GND improves noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail analog operation | Supports full-swing signals from GND to V+ without clipping - essential for unipolar sensor outputs and DAC buffers |
| Low charge injection (5pC) | Minimizes voltage glitch at COM during switching - critical for precision sample-and-hold and ADC front-end protection |
| TTL/CMOS logic compatibility | Accepts standard 1.8V–5V logic thresholds without level-shifting - simplifies interface with microcontrollers and FPGAs |
| Guaranteed RON flatness | 0.4Ω max variation across signal range - ensures stable gain and THD in audio routing and instrumentation amplifiers |
| Ultra-low off-leakage | ±0.25nA max at +25°C - prevents DC error accumulation in high-Z medical sensor and piezoelectric transducer circuits |
Applications
| Battery-Powered Data Loggers | Portable Audio Signal Routing |
|---|---|
Use Scenario: Multiplexing thermocouple, RTD, and strain gauge inputs into a single ADC channel under 3.3V Li-ion power. IC Role / Device Role / Timing Role: SPST-NO analog switch isolating individual sensors during measurement cycles to prevent loading and cross-talk. Use Value: 2.5Ω RON and 0.4Ω flatness preserve sensor bridge balance and measurement linearity; 8ns tOFF enables rapid channel scanning. |
Use Scenario: Selecting between microphone, line-in, and headphone output paths in a Bluetooth speaker with 5V USB charging. IC Role / Device Role / Timing Role: Low-distortion analog switch routing audio signals without introducing audible artifacts or level shifts. Use Value: 0.014% THD and -75dB off-isolation maintain signal integrity; rail-to-rail operation handles full 2VPP audio swing. |
| Medical Sensor Interface Modules | Industrial PLC Analog Input Conditioning |
Use Scenario: Isolating ECG electrode inputs during lead-off detection and amplification in a wearable monitor. IC Role / Device Role / Timing Role: High-impedance guard switch disconnecting unused electrodes to reduce common-mode noise and leakage-induced offset. Use Value: ±0.25nA off-leakage prevents DC drift in high-gain instrumentation amps; 1.8V operation extends battery life. |
Use Scenario: Switching between 4–20mA loop-powered sensors and 0–10V voltage inputs in a modular I/O card. IC Role / Device Role / Timing Role: Precision analog switch enabling flexible field-configurable input scaling without hardware changes. Use Value: Guaranteed RON ≤2.5Ω ensures accurate current-to-voltage conversion; -40°C to +85°C rating supports harsh industrial environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SPST analog switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADG801BRMZ-REEL | 2.3Ω RON at 5V, but 12ns tON/10ns tOFF; operates down to +1.4V supply | Superior low-voltage operation for sub-1.8V MCU interfaces; slightly slower switching than MAX4645EUA+ | Select ADG801BRMZ-REEL when interfacing with 1.4V–1.8V logic or requiring lower minimum supply voltage. |
| TS5A23157DCKR | 0.9Ω RON at 3.3V, but 15ns tON/12ns tOFF; higher off-leakage (±1nA at +25°C) | Better RON for low-loss signal paths, but less suitable for ultra-low-leakage sensor front-ends | Select TS5A23157DCKR where minimal on-resistance dominates over leakage or isolation specs. |
Compared with ADG801BRMZ-REEL and TS5A23157DCKR, the MAX4645EUA+ provides the best balance of ultra-low leakage (±0.25nA), high off-isolation (-75dB), and fast switching (8ns tOFF) - making it optimal for precision, battery-sensitive applications where signal integrity and power efficiency are jointly critical.
Availability
MAX4645EUA+ is available at Aetrix Electronics and suitable for battery-powered systems, audio/video signal routing, low-voltage data-acquisition systems, sample-and-hold circuits, and communications circuits requiring stable component supply across industrial temperature ranges.
Supply support for MAX4645EUA+ 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 industrial, medical, automotive, and communications applications.
The MAX4645EUA+ belongs to Maxim's precision analog switch product line, engineered specifically for low-RON, low-leakage, rail-to-rail signal routing in portable and instrumentation-grade systems.
FAQ
What is the maximum supply voltage rating for MAX4645EUA+?
The MAX4645EUA+ has an absolute maximum supply voltage (V+) of +6V, but its specified operating range is +1.8V to +5.5V. Operation at 5.5V ensures full compliance with all electrical characteristics including 2.5Ω RON, 8ns tOFF, and ±0.25nA leakage. Exceeding +6V risks permanent damage per the Absolute Maximum Ratings table.
Does MAX4645EUA+ support rail-to-rail analog signal switching?
Yes, the MAX4645EUA+ supports true rail-to-rail analog signal operation from GND to V+. This is achieved via CMOS switch architecture with matched P- and N-channel devices, allowing input signals spanning the full supply range without clipping or distortion - confirmed in the Detailed Description and Electrical Characteristics sections.
What is the logic polarity of MAX4645EUA+?
The MAX4645EUA+ is a normally open (NO) switch with active-high logic control: when IN = HIGH (≥2.4V at 5V supply), the COM–NO path closes; when IN = LOW (≤0.8V), the path remains open. This behavior is explicitly defined in the Truth Tables and Pin Descriptions for MAX4645EUA+.
Can MAX4645EUA+ be used with a 3.3V supply?
Yes, the MAX4645EUA+ operates fully specified at +3.3V (within its +1.8V to +5.5V range). At 3.3V, RON is guaranteed ≤3.5Ω, tON/tOFF remain ≤15ns/10ns, and leakage stays ≤±0.25nA - all verified in the +3V Supply Electrical Characteristics tables.
Is thermal derating required for MAX4645EUA+ in SOT23-5 package?
Yes, the SOT23-5 package has a thermal derating factor of 7.1mW/°C above +70°C ambient. Its maximum continuous power dissipation is 571mW at +70°C, decreasing linearly beyond that point. This is documented in the Absolute Maximum Ratings section and must be applied in high-power or high-temperature PCB layouts.
MAX4645EUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Switch Circuit:
- SPST - NO
- 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:
- 8-uMAX/uSOP
MAX4645EUA+ FAQ
1.How can I place an order for MAX4645EUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4645EUA+ 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 MAX4645EUA+ reliable?
The price and inventory of MAX4645EUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4645EUA+ is usually 5 days.
3.What payment methods are accepted for MAX4645EUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4645EUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4645EUA+?
MAX4645EUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4645EUA+ 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 MAX4645EUA+?
For technical support, including MAX4645EUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4645EUA+ requirements.
6.How does Aetrix verify that MAX4645EUA+ is sourced from the original manufacturer or authorized distributors?
All MAX4645EUA+ 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 MAX4645EUA+ meets industry standards.
7.What is the process for return or replacement of MAX4645EUA+?
All MAX4645EUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4645EUA+, 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 MAX4645EUA+ part is unused and in its original packaging.
Return procedure for MAX4645EUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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