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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:1,327
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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 in battery-powered and precision systems. It delivers 2.5Ω typical on-resistance at +5V, 0.4Ω max on-resistance flatness, 12ns turn-on time, and rail-to-rail analog signal handling from +1.8V to +5V supply - enabling high-fidelity audio switching and low-voltage data acquisition.
For engineers reviewing the MAX4645EUA datasheet, MAX4645EUA pinout, MAX4645EUA application, or MAX4645EUA equivalent, this device is selected for its guaranteed low leakage (±0.25nA at +25°C), -75dB off-isolation at 1MHz, 0.014% THD, and SOT23-5 package compatibility with space-constrained portable designs.
Technical Context
The MAX4645EUA implements a CMOS transmission-gate architecture with matched P/N channel devices to achieve flat on-resistance over the full 0V to V+ signal range. Its logic input accepts TTL/CMOS-compatible thresholds (VIL = 0.8V, VIH = 2.4V at +5V), enabling direct interface with microcontrollers and FPGAs without level-shifting.
Internal ESD protection and diode clamping allow safe operation with analog signals extending slightly beyond supply rails (–0.3V to V+ + 0.3V), while charge injection is limited to 5pC - critical for sample-and-hold accuracy and low-glitch multiplexing in data converters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-Resistance (RON) | 2.5Ω typ at +5V - ensures minimal voltage drop and signal attenuation in low-level analog paths |
| On-Resistance Flatness | 0.4Ω max - maintains consistent gain and linearity across full signal swing (0V to V+) |
| Turn-On / Turn-Off Time | 12ns / 8ns typ - supports high-speed multiplexing up to ~30MHz without timing skew |
| Off-Isolation | –75dB at 1MHz - suppresses crosstalk between inactive channels in multi-signal routing |
| Off-Leakage Current | ±0.25nA max at +25°C - preserves accuracy in high-impedance sensor interfaces and integrator circuits |
| Total Harmonic Distortion | 0.014% typ - enables clean audio and instrumentation signal switching without audible or measurable distortion |
| Supply Voltage Range | +1.8V to +5.5V - supports direct integration into Li-ion, coin-cell, and mixed-voltage embedded systems |
Pinout & Package
MAX4645EUA is housed in a 5-pin SOT23 package (JEDEC MO-178AA), with 1.6mm × 2.9mm footprint and 1.1mm height - suitable for dense PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Logic control input | Active-high digital enable; drives internal gate stack to connect COM–NO when high |
| 2 - NO | Normally open analog terminal | Open-circuit when IN = low; connects to COM only when switch is enabled |
| 3 - GND | Analog and digital ground reference | Common return path for supply, logic, and signal currents; must be low-impedance |
| 4 - COM | Analog common terminal | Signal input/output node shared between NO (MAX4645) or NC (MAX4646); bidirectional |
| 5 - V+ | Positive supply rail | Powers analog switch core and logic interface; bypassing with 0.1µF to GND recommended |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail signal handling | Supports analog inputs from GND to V+ without clipping or distortion - essential for full-scale ADC/DAC interfacing |
| TTL/CMOS logic compatibility | Direct interface with 3.3V/5V microcontrollers and FPGAs - eliminates external level shifters |
| Low charge injection (5pC) | Minimizes voltage glitch on sampled nodes - critical for precision sample-and-hold and switched-capacitor circuits |
| Guaranteed RON flatness | 0.4Ω max variation across signal range - ensures stable gain and predictable settling in gain-switching applications |
| Ultra-low off-leakage | ±0.25nA max at +25°C - prevents DC error accumulation in high-Z sensor front-ends and integrators |
Applications
| Battery-Powered Audio Routing | Low-Voltage Data Acquisition |
|---|---|
Use Scenario: Switching microphone or headphone signals in portable medical monitors and handheld test instruments powered by single-cell Li-ion batteries. IC Role / Device Role / Timing Role: SPST analog switch controlling signal path between codec and transducer, activated via MCU GPIO. Use Value: 2.5Ω RON and rail-to-rail operation preserve SNR and dynamic range; 1.8V minimum supply extends battery life without performance trade-off. |
Use Scenario: Multiplexing thermocouple, RTD, or pH sensor outputs into a 16-bit SAR ADC in industrial field transmitters. IC Role / Device Role / Timing Role: Precision analog switch isolating high-impedance sensor sources during channel scanning to prevent loading and cross-talk. Use Value: ±0.25nA off-leakage and 0.4Ω RON flatness ensure sub-LSB measurement accuracy across temperature and signal range. |
| Sample-and-Hold Circuits | Relay Replacement in ATE |
Use Scenario: Capturing fast transient waveforms in oscilloscope front-ends and power quality analyzers using switched-capacitor sampling networks. IC Role / Device Role / Timing Role: Low-charge-injection (5pC) switch connecting signal source to hold capacitor on precise clock edge. Use Value: Minimal voltage step on capacitor after switching enables accurate DC restoration and reduces acquisition settling time. |
Use Scenario: Replacing electromechanical relays in automated test equipment for high-cycle-count signal path configuration. IC Role / Device Role / Timing Role: Solid-state SPST switch enabling <10ns reconfiguration of DUT stimulus/sense paths under software control. Use Value: 50 million cycle lifetime, no contact wear, and 12ns tON eliminate relay maintenance and improve test throughput reliability. |
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 typ at +5V; 0.3Ω flatness; 10ns tON; operates down to +1.4V supply | Lower RON and faster switching, but higher 1.5nA off-leakage limits use in ultra-high-Z sensor paths | Select ADG801BRMZ-REEL when speed and lowest on-resistance outweigh leakage sensitivity. |
| TS5A23157DCUR | 0.9Ω RON typ at +3.3V; dual SPDT; 10ns tON; –65dB isolation at 1MHz | Dual-channel topology and lower RON suit compact multi-path routing, but lacks rail-to-rail capability below 2.5V | Select TS5A23157DCUR when dual independent switches and sub-1Ω RON are required in 3.3V systems. |
Compared with ADG801BRMZ-REEL and TS5A23157DCUR, the MAX4645EUA offers superior off-isolation (–75dB vs. –65dB), lower leakage (0.25nA vs. 1.5nA), and guaranteed rail-to-rail operation down to +1.8V - making it optimal for precision, low-power, single-channel signal gating where signal integrity is paramount.
Availability
MAX4645EUA 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 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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX4645EUA belongs to Maxim's precision analog switch product line, engineered for low-distortion, low-leakage, and rail-to-rail signal routing in portable and measurement-critical systems - not general-purpose switching.
FAQ
What is the maximum supply voltage rating for the MAX4645EUA?
The MAX4645EUA 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, and electrical characteristics are only guaranteed within the +1.8V to +5.5V range per the datasheet. The MAX4645EUA must never be biased beyond these limits even momentarily.
Does the MAX4645EUA support rail-to-rail analog signals?
Yes, the MAX4645EUA supports rail-to-rail analog signals - meaning it can pass voltages from GND to V+ without clipping or distortion. This capability is confirmed in both the General Description and Electrical Characteristics sections, and applies across its full +1.8V to +5.5V supply range. The MAX4645EUA achieves this via CMOS transmission-gate design with matched P/N devices.
What is the on-resistance flatness specification for the MAX4645EUA?
The MAX4645EUA guarantees on-resistance flatness of 0.4Ω maximum over its full analog signal range (0V to V+). This value is measured as the difference between maximum and minimum RON across the signal swing and is explicitly specified in the Electrical Characteristics table for +5V and +3V supplies. Flatness directly impacts gain stability in variable-gain and multiplexer applications.
Can the MAX4645EUA be used with a 3.3V logic interface?
Yes, the MAX4645EUA is fully compatible with 3.3V logic interfaces. Its input thresholds are TTL/CMOS-compatible: VIH = 2.0V min at +3.3V supply and VIH = 2.4V min at +5V supply. A 3.3V logic high (≥2.0V) reliably turns the MAX4645EUA on, and the device draws only 0.1µA input current - ensuring minimal loading on FPGA or MCU GPIO pins driving the MAX4645EUA.
What is the off-isolation performance of the MAX4645EUA at 10MHz?
The MAX4645EUA provides –55dB off-isolation at 10MHz, as specified in the Electrical Characteristics table under +5V and +3V supply conditions. This is lower than its –75dB performance at 1MHz, reflecting typical frequency-dependent degradation in analog switch isolation. System designers must verify isolation requirements at their target operating frequency - the MAX4645EUA remains effective for RF-adjacent and broadband signal routing up to ~5MHz.
MAX4645EUA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tube
- 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:
- 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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