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Analog Devices Inc./Maxim Integrated MAX4645EUK-T
- Part No.:
- MAX4645EUK-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX4645EUK-T.pdf
- Description:
- IC SW SPST-NOX1 2.5OHM SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,704
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Product details
Overview
MAX4645EUK-T from Maxim Integrated is a single-pole, single-throw (SPST), normally open (NO) CMOS analog switch optimized for low-distortion signal routing in battery-powered and precision systems. It delivers 2.5Ω typical on-resistance at +5V, 0.4Ω max on-resistance flatness over rail-to-rail signal range, and 8ns turn-off time - enabling high-fidelity audio switching and fast data-acquisition sampling.
For engineers reviewing the MAX4645EUK-T datasheet, MAX4645EUK-T pinout, MAX4645EUK-T application, or MAX4645EUK-T 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 suitability for space-constrained PCB layouts.
Technical Context
The MAX4645EUK-T uses complementary MOSFET architecture to support rail-to-rail analog signals from GND to V+ (1.8V–5.5V), with internal charge-balanced switching minimizing distortion and charge injection (5pC typical). Its logic input accepts TTL/CMOS thresholds (VIL = 0.8V, VIH = 2.4V at 5V supply), ensuring robust control across voltage-scalable systems.
Designed for low-power operation, it draws only 0.1µA supply current at +25°C and maintains stable RON flatness (≤0.4Ω) across the full analog signal swing - critical for precision sample-and-hold and instrumentation front-ends where gain error and THD must remain predictable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-resistance (RON) | 2.5Ω typical at V+ = 5V; ensures minimal signal attenuation and gain error in precision analog paths. |
| On-resistance flatness | 0.4Ω max over full signal range; guarantees consistent channel matching and low harmonic distortion (0.014% THD). |
| Turn-off time (tOFF) | 8ns typical at V+ = 5V; enables high-speed multiplexing in data-acquisition and communications circuits. |
| Off-leakage current | ±0.25nA max at +25°C; preserves accuracy in high-impedance sensor interfaces and sample-and-hold hold capacitors. |
| Supply voltage range | +1.8V to +5.5V single supply; supports direct integration into Li-ion battery-powered systems without level-shifting. |
| Off-isolation | -75dB at 1MHz; suppresses crosstalk between adjacent channels in audio/video routing applications. |
| Charge injection | 5pC typical; minimizes voltage glitch on hold capacitors during switching transitions. |
Pinout & Package
SOT23-5 package: compact 2.9mm × 1.6mm surface-mount outline with exposed pad not present; rated for -40°C to +85°C industrial temperature operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Logic control input | TTL/CMOS-compatible digital input; drives internal gate to enable/disable switch conduction. |
| 2 - NO | Normally open analog terminal | Connects to COM only when IN = logic high; defines SPST NO topology per truth table. |
| 3 - GND | Analog and digital ground reference | Common return path for supply, logic, and analog signals; must be low-impedance for leakage and noise control. |
| 4 - COM | Analog common terminal | Signal input/output node shared with NO (MAX4645) or NC (MAX4646); forms switched path endpoint. |
| 5 - V+ | Positive supply rail | Single power source for analog and logic sections; supports 1.8V–5.5V operation with no external bias required. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail signal handling | Analog signals from GND to V+ pass unclamped - eliminates external clamping diodes in wide-dynamic-range systems. |
| Low on-resistance flatness | 0.4Ω max variation across full signal swing - ensures linear gain response and <0.014% THD in audio paths. |
| TTL/CMOS logic compatibility | VIL ≤0.8V / VIH ≥2.4V at 5V supply - allows direct interfacing with microcontrollers and FPGAs without level shifters. |
| Guaranteed leakage performance | ±0.25nA max COM off-leakage at +25°C - maintains >16-bit effective resolution in 1MΩ+ impedance data-acquisition inputs. |
| Fast switching | 12ns tON, 8ns tOFF - supports >10 MSPS multiplexing in automated test equipment and high-speed DAQ. |
Applications
| Battery-Powered Audio Routing | Low-Voltage Data-Acquisition Front-End |
|---|---|
|
Use Scenario: Selecting between multiple microphone or line-level inputs in portable medical monitors or wireless headsets. IC Role / Device Role / Timing Role: SPST NO analog switch routing signal path from source to ADC input while rejecting crosstalk. Use Value: 2.5Ω RON and -75dB off-isolation preserve SNR >95dB; 1.8V operation extends battery life in coin-cell designs. |
Use Scenario: Multiplexing sensor outputs (thermocouples, strain gauges) into a single precision ADC in handheld test instruments. IC Role / Device Role / Timing Role: Low-leakage, rail-to-rail analog switch enabling high-Z source buffering before programmable-gain amplifier stage. Use Value: ±0.25nA off-leakage prevents >1LSB error in 24-bit sigma-delta converters; 0.4Ω RON flatness ensures channel-to-channel gain match ≤0.01%. |
| Sample-and-Hold Circuit Switching | Relay Replacement in Automated Test Equipment |
|
Use Scenario: Controlling hold capacitor charging/discharging in precision sample-and-hold amplifiers for oscilloscope front-ends. IC Role / Device Role / Timing Role: Fast, low-charge-injection SPST switch isolating hold capacitor during acquisition phase. Use Value: 5pC typical charge injection limits voltage glitch to <500µV on 1nF hold capacitors - maintaining 16-bit settling accuracy. |
Use Scenario: Replacing electromechanical relays in semiconductor ATE channel cards requiring >1M cycle reliability and sub-10ns timing control. IC Role / Device Role / Timing Role: Solid-state SPST switch providing repeatable, bounce-free signal path selection with no moving parts. Use Value: 12ns/8ns switching enables precise timing windows in high-speed functional testing; 50mA continuous current rating supports 5V/10mA DUT loads. |
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 | 0.3Ω typical RON at 5V but higher 10nA max off-leakage; operates down to 1.8V with similar SOT23-6 footprint. | Better RON for ultra-low-loss paths, but higher leakage limits use in >10MΩ sensor interfaces. | Select ADG801BRMZ-REEL when lowest possible on-resistance is critical and leakage tolerance >1nA is acceptable. |
| TS5A23157DBVR | 0.9Ω typical RON at 5V, 25ns tON/15ns tOFF, and ±10nA leakage - wider supply range (1.65V–5.5V) in same SOT23-6 package. | Slower switching and higher leakage suit cost-sensitive consumer audio, not precision DAQ or medical monitoring. | Choose TS5A23157DBVR for high-volume, non-critical signal routing where BOM cost outweighs THD and timing specs. |
Compared with MAX4645EUK-T, ADG801BRMZ-REEL offers lower RON but trades off leakage-limited accuracy, while TS5A23157DBVR reduces cost and broadens supply flexibility at the expense of speed and distortion performance - making MAX4645EUK-T optimal for industrial-grade, low-leakage, fast-switching analog routing.
Availability
MAX4645EUK-T is available at Aetrix Electronics and suitable for battery-powered systems, audio and video signal routing, and low-voltage data-acquisition systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX4645EUK-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 communications applications - emphasizing high reliability, low power, and signal integrity.
The MAX4645/MAX4646 family targets low-voltage, low-distortion analog switching in space- and power-constrained systems - delivering rail-to-rail operation, nanosecond switching, and sub-nanoampere leakage for next-generation portable instrumentation and test equipment.
FAQ
What is the maximum supply voltage rating for MAX4645EUK-T?
The MAX4645EUK-T has an absolute maximum supply voltage (V+) of +6V, but its specified operating range is +1.8V to +5.5V. Operation above +5.5V risks permanent damage per the Absolute Maximum Ratings table. For reliable long-term use, maintain V+ within 4.5V–5.5V when targeting 2.5Ω typical RON and guaranteed 0.4Ω flatness. The MAX4645EUK-T datasheet confirms this limit applies across the full -40°C to +85°C temperature range.
Does MAX4645EUK-T support rail-to-rail analog signals?
Yes, the MAX4645EUK-T supports rail-to-rail analog signals - meaning it passes voltages from GND to V+ without clipping or distortion. This capability stems from its CMOS switch architecture and internal level-shifting design, verified by the "Input Voltage Range" specification (VCOM, VNO, VNC = 0 to V+). At V+ = 5V, signals from 0V to 5V pass unattenuated, making MAX4645EUK-T suitable for high-fidelity audio and precision sensor interfaces where signal headroom is critical.
What is the logic configuration of MAX4645EUK-T?
The MAX4645EUK-T is a normally open (NO) SPST analog switch: the COM-to-NO path is open (non-conductive) when the IN pin is logic low (≤0.8V), and closed (conductive) when IN is logic high (≥2.4V at 5V supply). This behavior is explicitly defined in the truth table and functional diagrams for MAX4645EUK-T, distinguishing it from the MAX4646EUK-T (normally closed). No external pull-up/down resistors are needed due to TTL/CMOS-compatible input thresholds.
Can MAX4645EUK-T operate from a 3V supply?
Yes, the MAX4645EUK-T operates fully specified from a +2.7V to +3.3V single supply. At 3V, its typical on-resistance is 3.5Ω max (vs. 2.5Ω max at 5V), and switching times increase slightly to 12ns tON/8ns tOFF. All key parameters - including ±0.25nA leakage, rail-to-rail signal handling, and TTL/CMOS logic compatibility - remain guaranteed across the 3V range. This makes MAX4645EUK-T ideal for dual-supply or battery-depleted systems where voltage drops below 3.3V.
What package type does MAX4645EUK-T use?
The MAX4645EUK-T uses the 5-pin SOT23 package (JEDEC MO-178AA), measuring 2.9mm × 1.6mm × 1.1mm with gull-wing leads. Pin 5 is marked with alphanumeric top-side marking (e.g., "XYZA") nearest the lettering edge. This package has no exposed thermal pad and is rated for -40°C to +85°C operation. The "EUK-T" suffix explicitly denotes the SOT23-5 variant, distinct from the 6-pin SOT23 ("EUT-T") and 8-pin µMAX ("EUA") versions of the same device family.
MAX4645EUK-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- SOT-23-5
MAX4645EUK-T FAQ
1.How can I place an order for MAX4645EUK-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4645EUK-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 MAX4645EUK-T reliable?
The price and inventory of MAX4645EUK-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4645EUK-T is usually 5 days.
3.What payment methods are accepted for MAX4645EUK-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4645EUK-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4645EUK-T?
MAX4645EUK-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4645EUK-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 MAX4645EUK-T?
For technical support, including MAX4645EUK-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4645EUK-T requirements.
6.How does Aetrix verify that MAX4645EUK-T is sourced from the original manufacturer or authorized distributors?
All MAX4645EUK-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 MAX4645EUK-T meets industry standards.
7.What is the process for return or replacement of MAX4645EUK-T?
All MAX4645EUK-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4645EUK-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 MAX4645EUK-T part is unused and in its original packaging.
Return procedure for MAX4645EUK-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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