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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:3,098
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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/video switching and low-leakage sample-and-hold circuits.
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 signal-dependent on-resistance variation. Its logic input accepts standard TTL/CMOS thresholds (VIL = 0.8V, VIH = 2.4V at 5V supply) and drives the gate of the NO switch directly without external level-shifting.
Switching dynamics are characterized by 12ns tON and 8ns tOFF (VCOM = 3V, RL = 300Ω, CL = 35pF), while low 5pC typical charge injection and 0.014% THD ensure minimal transient disturbance and harmonic distortion in sensitive signal paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-Resistance (RON) | 2.5Ω typical at V+ = 5V - ensures minimal voltage drop and power loss in signal path |
| On-Resistance Flatness | 0.4Ω max over full signal range - maintains consistent gain and linearity across rail-to-rail inputs |
| Turn-Off Time (tOFF) | 8ns typical - enables fast channel switching in multiplexed data-acquisition systems |
| Off-Leakage Current | ±0.25nA max at +25°C - preserves accuracy in high-impedance sample-and-hold and sensor interfaces |
| Off-Isolation | -75dB at 1MHz - suppresses crosstalk between inactive channels in audio/video routing |
| Supply Voltage Range | +1.8V to +5.5V - supports direct integration into Li-ion, coin-cell, and mixed-voltage embedded systems |
| Total Harmonic Distortion | 0.014% typical - meets fidelity requirements for professional audio signal switching |
Pinout & Package
SOT23-5 package (5-pin, surface-mount, 2.9mm × 1.6mm footprint) with exposed pad not present; compact form factor ideal for portable and high-density PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Logic control input | Active-high TTL/CMOS-compatible enable; drives internal switch gate; logic '1' closes NO path |
| 2 - NO | Normally open analog terminal | Open-circuit when IN = 0; connects to COM only when IN = 1; no internal connection when off |
| 3 - GND | Analog and digital ground reference | Common return for V+, logic inputs, 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); bidirectional rail-to-rail path |
| 5 - V+ | Positive supply rail | Single power source for analog and logic sections; supports 1.8V–5.5V operation; bypass with 0.1µF capacitor recommended |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail analog signal handling | Supports input/output voltages from GND to V+ without clipping or distortion - essential for full-scale sensor and audio signals |
| Low 5pC charge injection | Minimizes voltage glitch on COM during switching - critical for precision sample-and-hold and ADC front-end applications |
| TTL/CMOS logic compatibility | Direct interface with microcontrollers and FPGAs without level shifters - reduces BOM count and layout complexity |
| Guaranteed RON ≤2.5Ω (5V) | Ensures predictable insertion loss and channel matching in multi-switch arrays - simplifies system calibration |
| -75dB off-isolation at 1MHz | Provides robust channel separation in video multiplexing and communications circuitry - prevents signal bleed-through |
Applications
| Audio Signal Routing | Portable Data Acquisition |
|---|---|
Use Scenario: Switching between multiple microphone or line-level inputs in a handheld audio recorder. IC Role / Device Role / Timing Role: SPST analog switch selecting active input path to ADC preamplifier stage. Use Value: 0.014% THD and rail-to-rail capability preserve dynamic range and frequency response up to 20kHz. |
Use Scenario: Multiplexing thermistor, RTD, and strain gauge sensors onto a single precision ADC in a field-deployable sensor node. IC Role / Device Role / Timing Role: Low-leakage analog switch isolating high-impedance sensor elements during sampling. Use Value: ±0.25nA max off-leakage avoids measurement error in >1MΩ sensor bridges. |
| Sample-and-Hold Circuits | Relay Replacement in Test Equipment |
Use Scenario: Capturing fast transient waveforms in automated test equipment using a switched-capacitor hold circuit. IC Role / Device Role / Timing Role: Fast-turn-on analog switch connecting signal source to hold capacitor before acquisition window. Use Value: 12ns tON and 5pC charge injection minimize aperture uncertainty and pedestal error. |
Use Scenario: Replacing electromechanical relays in semiconductor ATE channel switching matrices requiring >1M cycles lifetime. IC Role / Device Role / Timing Role: Solid-state SPST switch enabling programmable signal path configuration without moving parts. Use Value: 2.5Ω RON and 0.4Ω flatness deliver stable contact resistance vs. temperature - eliminating relay bounce and wear-out failure modes. |
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), 1.8V–5.5V supply, but 15ns tON/12ns tOFF; higher 10pC charge injection | Higher THD (0.02%) and lower off-isolation (-65dB) limit use in high-fidelity audio | Preferred where ultra-low RON dominates over speed and distortion specs |
| TS5A23157DCUR | 0.9Ω RON (typ) at 3V, but only rated to 3.6V max supply; 10ns tON/8ns tOFF; ±1nA leakage at +25°C | Not suitable for 5V systems or low-leakage sample-and-hold due to higher leakage and voltage limitation | Best for 3.3V-only portable designs prioritizing lowest RON over wide supply range |
Compared with ADG801BRMZ-REEL and TS5A23157DCUR, the MAX4645EUK+T uniquely balances 2.5Ω RON, 8ns tOFF, ±0.25nA leakage, and 5V operation - making it the optimal choice for battery-powered test gear and precision analog multiplexing where supply flexibility and leakage integrity are non-negotiable.
Availability
MAX4645EUK+T is available at Aetrix Electronics and suitable for battery-powered systems, audio/video signal routing, and low-voltage data-acquisition systems requiring stable component supply across industrial temperature ranges (-40°C to +85°C).
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 demanding industrial, medical, and communications applications.
The MAX4645EUK+T belongs to Maxim's high-speed, low-RON analog switch product line, engineered specifically for replacing mechanical relays and enabling rail-to-rail signal integrity in portable and test instrumentation systems.
FAQ
What is the maximum supply voltage rating for the 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 at 5.5V ensures full compliance with all electrical characteristics including 2.5Ω RON, 8ns tOFF, and ±0.25nA leakage. Exceeding 5.5V risks violating guaranteed performance and may cause permanent damage per absolute maximum ratings.
Does the MAX4645EUK+T support rail-to-rail analog signal switching?
Yes, the MAX4645EUK+T supports true rail-to-rail analog signal operation: both COM and NO terminals handle input/output voltages from GND to V+ across the full +1.8V to +5.5V supply range. This capability is enabled by its CMOS switch architecture and confirmed in the Electrical Characteristics table under "Input Voltage Range" (VCOM, VNO = 0 to V+).
What is the logic polarity of the control input on the MAX4645EUK+T?
The MAX4645EUK+T features active-high logic control: applying a logic high (≥2.4V at V+ = 5V) to the IN pin closes the NO-to-COM path, while logic low (≤0.8V) opens it. This is explicitly defined in the truth table ("INPUT 0 → OFF", "INPUT 1 → ON") and functional diagram for the MAX4645 variant.
Can the MAX4645EUK+T be used in a 3.3V system?
Yes, the MAX4645EUK+T is fully specified for 3.3V operation: RON is guaranteed ≤3.5Ω, tON/tOFF remain ≤15ns/10ns, and leakage stays within ±0.25nA limits. The Electrical Characteristics table includes dedicated columns for V+ = 2.7V to 3.3V, confirming functionality and parametric compliance at 3.3V nominal supply.
Is a bypass capacitor required for stable operation of the MAX4645EUK+T?
A 0.1µF ceramic bypass capacitor from V+ to GND is recommended per the Applications Information section to improve noise margin and prevent switching transients from coupling into other system components. While not strictly mandatory for basic functionality, omission may degrade THD, increase susceptibility to supply noise, and reduce immunity to fast logic edge coupling - especially in mixed-signal PCB layouts.
MAX4645EUK+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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:
- 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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