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Analog Devices Inc./Maxim Integrated MAX4644EUA+
- Part No.:
- MAX4644EUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4644EUA+.pdf
- Description:
- IC SWITCH SPDT X 1 4OHM 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:379
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Product details
Overview
The MAX4644EUA+ from Maxim Integrated is a single-pole/double-throw (SPDT) CMOS analog switch operating from a single +1.8V to +5.5V supply, delivering 4Ω max on-resistance at +5V, 18ns typical turn-on time, and rail-to-rail analog signal handling - used for precision audio routing and low-voltage data-acquisition signal path selection.
For engineers reviewing the MAX4644EUA+ datasheet, MAX4644EUA+ pinout, MAX4644EUA+ application, or MAX4644EUA+ equivalent, key selection criteria include guaranteed RON flatness (≤0.75Ω), break-before-make timing (≤8ns), sub-0.01µW quiescent power, and -82dB crosstalk at 1MHz - critical for battery-powered instrumentation and high-fidelity audio switching.
Technical Context
The MAX4644EUA+ uses BiCMOS process technology to achieve low RON and high-speed switching while maintaining TTL/CMOS-compatible logic inputs. Its internal logic-level translators convert digital control signals into full-rail analog gate drives, enabling bidirectional signal flow with matched channel RON (≤0.1Ω typ at +5V).
ESD protection diodes are integrated between each analog pin (COM, NO, NC) and both V+ and GND, defining leakage behavior: off-state leakage remains <0.35nA over -40°C to +85°C, and charge injection is tightly controlled at 5pC typical - essential for sample-and-hold accuracy and low-distortion audio paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +1.8V to +5.5V single supply - enables direct interface with Li-ion battery systems and 3.3V/5V logic domains without level shifters. |
| On-Resistance (RON) | 4Ω max at +5V - ensures minimal signal attenuation and gain error in precision sensor front-ends and DAC output routing. |
| RON Flatness | 0.75Ω typ at +5V - maintains consistent gain across full analog input range (0V to V+), critical for linearity in audio and measurement circuits. |
| Turn-On/Off Time | 18ns/12ns typ at +5V - supports high-speed multiplexing in data acquisition up to ~20MHz effective sampling rate. |
| Crosstalk / Off-Isolation | -82dB / -80dB at 1MHz - prevents signal coupling between channels in multi-source audio/video routing applications. |
| Quiescent Supply Current | <0.01µW - enables always-on signal-path switching in energy-harvesting and portable medical devices. |
| Total Harmonic Distortion | 0.018% - preserves fidelity in audio signal paths without requiring external compensation. |
Pinout & Package
The MAX4644EUA+ is housed in an 8-pin µMAX® package (package code U8+1), measuring 3.0mm × 3.0mm × 1.1mm, with exposed pad for thermal enhancement and RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Digital Control Input | TTL/CMOS-compatible logic input controlling switch state; referenced to GND, valid at +5V supply for full compatibility. |
| 2 (GND) | Analog/Digital Ground | Common reference for analog signal paths and digital logic; must be low-impedance to minimize noise coupling. |
| 3 (NO) | Normally Open Analog Terminal | Connects to COM when IN = high; bidirectional signal path with 12pF off-capacitance and <0.35nA leakage. |
| 4 (COM) | Common Analog Terminal | Central signal node shared by both NO and NC paths; supports rail-to-rail analog voltages (0V to V+). |
| 5 (NC) | Normally Closed Analog Terminal | Connects to COM when IN = low; identical RON and leakage specs as NO for matched channel performance. |
| 6 (N.C.) | No Connection | Internally unconnected pin - must be left floating or tied to GND per layout best practices; no electrical function. |
| 7 (N.C.) | No Connection | Internally unconnected pin - no bonding wire; requires no external connection. |
| 8 (V+) | Positive Supply Input | Single power rail for analog and digital sections; requires 0.1µF ceramic bypass capacitor to GND near the pin. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-Rail Signal Handling | Supports analog inputs from 0V to V+ across full temperature range - eliminates need for external biasing in single-supply systems. |
| Break-Before-Make Timing | Guaranteed ≤8ns tBBM - prevents momentary shorting between NO and NC during state transitions, protecting downstream circuitry. |
| Matched Channel RON | 0.1Ω typical difference between NO→COM and NC→COM paths - ensures balanced gain and phase in differential or dual-path routing. |
| Low Charge Injection | 5pC typical - minimizes voltage glitch at COM during switching, preserving accuracy in sample-and-hold and ADC front-end applications. |
| Ultra-Low Leakage | <0.35nA over -40°C to +85°C - maintains signal integrity in high-impedance sensor interfaces and battery-monitoring circuits. |
Applications
| Battery-Operated Equipment | Audio Signal Routing |
|---|---|
Use Scenario: Automatic battery-cell monitoring and selection in multi-cell portable instruments. IC Role / Device Role / Timing Role: SPDT switch selecting between individual Li-ion cells for voltage sensing while isolating unused paths. Use Value: 4Ω RON and <0.35nA leakage ensure measurement accuracy within ±0.5mV at 10MΩ source impedance. | Use Scenario: Source selection in portable headphone amplifiers with multiple input options (3.5mm, Bluetooth DAC, USB-C audio). IC Role / Device Role / Timing Role: Low-distortion analog switch routing line-level audio signals without DC blocking capacitors. Use Value: 0.018% THD and -82dB crosstalk preserve stereo separation and dynamic range in 24-bit playback. |
| Low-Voltage Data-Acquisition Systems | Sample-and-Hold Circuits |
Use Scenario: Multiplexing sensor outputs (thermocouples, RTDs, strain gauges) into a single 16-bit SAR ADC. IC Role / Device Role / Timing Role: Precision analog switch providing low RON, flat RON, and fast settling before ADC conversion. Use Value: 0.75Ω RON flatness limits gain nonlinearity to <0.02% FS, supporting 16-bit ENOB performance. | Use Scenario: Holding sampled voltage on a 100pF hold capacitor in a precision data logger. IC Role / Device Role / Timing Role: Fast, low-charge-injection switch disconnecting the sampling network from the hold capacitor. Use Value: 5pC charge injection limits hold-step error to <50µV on 100pF capacitor - sufficient for 18-bit resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SPDT analog switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADG774ACPZ-REEL7 | 4.5Ω RON max at +5V; 12ns tON; LFCSP-16 package (4mm × 4mm) | Higher pin count, larger footprint; includes enable pin and dual SPDT configuration | Choose when board space allows larger package and dual-channel operation is needed. |
| TS5A23157DCUR | 0.9Ω RON at +3.3V; 10ns tON; SOT-23-6 package; 1.65V–5.5V supply | Lower RON but higher leakage (1nA); no NC terminal - SPDT with COM/NO only | Choose for ultra-low RON in 3.3V-only systems where NC functionality is not required. |
Compared with ADG774ACPZ-REEL7 and TS5A23157DCUR, the MAX4644EUA+ uniquely combines 4Ω RON, true SPDT (NO/NC/COM) topology, 8-pin µMAX footprint, and sub-nA leakage - making it optimal for space-constrained, low-power, high-precision single-channel routing where NC path integrity matters.
Availability
The MAX4644EUA+ is available at Aetrix Electronics and suitable for battery-operated equipment, audio signal routing, and low-voltage data-acquisition systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX4644EUA+ 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 high-reliability semiconductor solutions for industrial, medical, and communications markets.
The MAX4644EUA+ belongs to Maxim's high-speed analog switch product line, engineered specifically for low-voltage, low-power, and low-distortion signal routing in portable and precision instrumentation applications.
FAQ
What is the maximum supply voltage rating for the MAX4644EUA+?
The MAX4644EUA+ has an absolute maximum supply voltage (V+) of +6V. However, functional operation is specified from +1.8V to +5.5V. Operating continuously at +6V exceeds the recommended range and may impact reliability or parametric performance. The MAX4644EUA+ is rated for 4.5V to 5.5V operation in its primary +5V characterization, with guaranteed RON ≤4Ω and tON ≤18ns under those conditions.
Does the MAX4644EUA+ support rail-to-rail analog signals?
Yes, the MAX4644EUA+ supports rail-to-rail analog signal voltages from 0V to V+ across its entire specified temperature range (-40°C to +85°C). This capability is enabled by its BiCMOS process and internal level-shifting architecture, allowing direct interfacing with sensors, DACs, and ADCs without external biasing networks. The MAX4644EUA+ maintains RON flatness ≤0.75Ω over this full range at +5V supply.
What is the purpose of pins 6 and 7 on the MAX4644EUA+?
Pins 6 and 7 on the MAX4644EUA+ are labeled N.C. (No Connection) and are internally unconnected - they contain no bond wires and serve no electrical function. These pins may be left floating or tied to GND for mechanical stability or EMI reduction, but must not be used as supply, ground, or signal nodes. Their presence accommodates the 8-pin µMAX® package outline while maintaining pin compatibility with other members of the MAX46xx family.
How does the MAX4644EUA+ achieve break-before-make operation?
The MAX4644EUA+ achieves guaranteed break-before-make (BBM) timing through internal logic design that delays turn-on of the newly selected path until the previously active path is fully turned off. At +5V, tBBM is guaranteed ≤8ns, preventing momentary shorting between NO and NC terminals. This behavior is process-verified and tested - not dependent on external timing or slew rate - ensuring safe switching in sensitive analog signal chains where cross-conduction must be avoided.
Is the MAX4644EUA+ compatible with 1.8V logic control signals?
The MAX4644EUA+ accepts 1.8V logic-high signals only when operated from a +1.8V supply; its input thresholds scale with V+. At +1.8V supply, VIH is guaranteed ≥0.6×V+ (≥1.08V), so a 1.8V logic-high meets this. However, when powered from +5V, VIH is specified as 2.4V minimum - meaning 1.8V logic signals will not reliably activate the switch. For mixed-voltage systems, level translation is required unless V+ = 1.8V. The MAX4644EUA+ datasheet confirms TTL/CMOS compatibility only at +5V supply.
MAX4644EUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Switch Circuit:
- SPDT
- Multiplexer/Demultiplexer Circuit:
- 2:1
- Number of Circuits:
- 1
- On-State Resistance (Max):
- 4Ohm
- Channel-to-Channel Matching (ΔRon):
- 100mOhm
- Voltage - Supply, Single (V+):
- 1.8V ~ 5.5V
- Voltage - Supply, Dual (V±):
- -
- Switch Time (Ton, Toff) (Max):
- 15ns, 5ns
- -3db Bandwidth:
- -
- Charge Injection:
- 5pC
- Channel Capacitance (CS(off), CD(off)):
- 12pF
- Current - Leakage (IS(off)) (Max):
- 250pA
- Crosstalk:
- -82dB @ 1MHz
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX4644EUA+ FAQ
1.How can I place an order for MAX4644EUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4644EUA+ 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 MAX4644EUA+ reliable?
The price and inventory of MAX4644EUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4644EUA+ is usually 5 days.
3.What payment methods are accepted for MAX4644EUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4644EUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4644EUA+?
MAX4644EUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4644EUA+ 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 MAX4644EUA+?
For technical support, including MAX4644EUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4644EUA+ requirements.
6.How does Aetrix verify that MAX4644EUA+ is sourced from the original manufacturer or authorized distributors?
All MAX4644EUA+ 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 MAX4644EUA+ meets industry standards.
7.What is the process for return or replacement of MAX4644EUA+?
All MAX4644EUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4644EUA+, 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 MAX4644EUA+ part is unused and in its original packaging.
Return procedure for MAX4644EUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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