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Analog Devices Inc./Maxim Integrated MAX4643ETA
- Part No.:
- MAX4643ETA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX4643ETA.pdf
- Description:
- DUAL SPST ANALOG SWITCH
- Quantity:
- Payment:
- Shipping:
Inventory:1,556
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Product details
Overview
MAX4643ETA from Maxim Integrated is a dual SPST analog switch IC with one normally open (NO) and one normally closed (NC) channel, operating from +1.8V to +5.5V single supply. It delivers 4Ω max on-resistance at +5V, 0.6Ω RON matching between channels, 1Ω RON flatness, <20ns switching times, and <0.35nA leakage over –40°C to +85°C - enabling precision signal routing in low-voltage portable audio and data-acquisition systems.
For engineers reviewing the MAX4643ETA datasheet, MAX4643ETA pinout, MAX4643ETA application, or MAX4643ETA equivalent, this page provides verified electrical specs, functional pin mapping, real-world use cases in battery-powered instrumentation, and validated alternative parts for design flexibility and supply continuity.
Technical Context
The MAX4643ETA integrates two independent CMOS SPST switches - one NO and one NC - sharing a common control architecture with rail-to-rail analog signal handling and logic-level translation for TTL/CMOS compatibility at +5V. Its break-before-make timing (7ns typ) prevents signal shorting during channel transitions.
Internal ESD diodes clamp analog pins to V+ and GND, limiting overvoltage stress but contributing to temperature-dependent leakage. Charge injection is tightly controlled at 2pC typ, and off-isolation reaches –80dB at 1MHz, supporting high-fidelity signal integrity in sensitive measurement paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +1.8V to +5.5V - enables direct integration into Li-ion–powered systems without level-shifting. |
| On-Resistance (RON) | 4Ω max at +5V - ensures minimal signal attenuation and voltage drop in precision sensor interfaces. |
| RON Matching | 0.6Ω max between channels - critical for matched gain paths in differential or dual-channel sampling circuits. |
| Switching Speed | tON = 18ns typ, tOFF = 12ns typ - supports >25MHz digital control of analog signals in high-speed multiplexing. |
| Analog Signal Range | Rail-to-rail - allows full-swing AC/DC signals from GND to V+, simplifying biasing in single-supply systems. |
| Leakage Current | <0.35nA over –40°C to +85°C - preserves accuracy in high-impedance sample-and-hold or pH sensor front-ends. |
| Off-Isolation | –80dB at 1MHz - suppresses crosstalk between active and inactive channels in multi-signal routing applications. |
Pinout & Package
MAX4643ETA is housed in an 8-pin µMAX package (3mm × 3mm, 0.8mm height), thermally enhanced for low-power operation and compatible with standard fine-pitch PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5 | NO1, NC2 | Normally open (Pin 1) and normally closed (Pin 5) switch terminals - bidirectional analog I/O with identical RON and capacitance specs. |
| 2, 6 | IN1, IN2 | Digital control inputs - TTL/CMOS-compatible at +5V; drive internal gate logic to actuate respective switches. |
| 3, 7 | GND | Ground reference for analog and digital sections - must be low-impedance to minimize noise coupling and ensure stable RON. |
| 4 | COM1 | Common terminal for NO1 switch - connects to signal source or load depending on IN1 state. |
| 8 | V+ | Positive supply input - requires local 0.1µF ceramic bypass to GND for stable switching performance and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail analog range | Supports full-swing signals from GND to V+, eliminating external bias networks in single-supply data acquisition. |
| Break-before-make timing | 7ns typical - prevents momentary short-circuit between COM1 and COM2 during channel switching in mixed-signal routing. |
| Low charge injection (2pC) | Minimizes voltage glitch on high-impedance nodes (e.g., integrator inputs), preserving accuracy in sample-and-hold stages. |
| Guaranteed RON flatness (1Ω) | Ensures consistent gain and linearity across the entire analog input range - essential for precision instrumentation amplifiers. |
| Ultra-low quiescent power (<0.01µW) | Enables always-on signal monitoring in energy-constrained IoT edge sensors without measurable battery drain. |
Applications
| Battery-Powered Audio Routing | Portable Data-Acquisition Front-End |
|---|---|
Use Scenario: Selecting between microphone and line-in inputs in a handheld voice recorder with Li-ion supply. IC Role / Device Role / Timing Role: Dual SPST switch routing analog audio paths under microcontroller GPIO control; NO/NC configuration enables default-safe mute path. Use Value: 4Ω RON and 0.018% THD preserve SNR; rail-to-rail support avoids DC blocking caps, reducing BOM count and board area. |
Use Scenario: Multiplexing multiple sensor outputs (thermocouple, RTD, strain gauge) into a shared ADC channel. IC Role / Device Role / Timing Role: Precision analog switch isolating high-Z sensor sources; low leakage and matched RON maintain measurement accuracy across channels. Use Value: 0.35nA leakage prevents offset drift in µV-level measurements; 0.6Ω RON match minimizes gain error between sensor channels. |
| Communications Signal Switching | Sample-and-Hold Circuit Control |
Use Scenario: Reconfiguring RF front-end test equipment to route different IF signals to spectrum analyzer inputs. IC Role / Device Role / Timing Role: High-speed analog switch enabling sub-20ns reconfiguration of signal paths without mechanical relays. Use Value: –80dB off-isolation at 1MHz suppresses interference between adjacent test channels; fast tON/tOFF supports automated test sequencing. |
Use Scenario: Controlling hold capacitor charging/discharging in a precision 16-bit SAR ADC reference buffer stage. IC Role / Device Role / Timing Role: Low-charge-injection switch isolating hold capacitor during acquisition phase; NC path maintains default connection until triggered. Use Value: 2pC charge injection limits hold-step error to <1 LSB at 16-bit resolution; guaranteed RON flatness ensures linear settling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual SPST analog switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADG702BRMZ | Single +3V to +5.5V supply; 4.5Ω RON max at +5V; no break-before-make guarantee; 3.5ns faster tON. | Optimized for higher-speed digital control; lacks NC/NO pairing - requires external logic for default-state safety. | Select when speed >100MHz switching is required and default fail-safe path is implemented externally. |
| TS5A23157DCKR | +1.65V to +5.5V supply; 0.9Ω RON typ at +3V; 1.5pC charge injection; no guaranteed RON matching or flatness spec. | Better RON at low voltage but unguaranteed matching - unsuitable for precision differential or ratiometric sensing. | Prefer for cost-sensitive consumer audio where absolute matching is non-critical and supply is ≤3.3V. |
Compared with MAX4643ETA, ADG702BRMZ offers marginally faster switching but no integrated NC/NO pairing or guaranteed RON matching, while TS5A23157DCKR improves low-voltage RON and charge injection but sacrifices specification guarantees needed for metrology-grade designs.
Availability
MAX4643ETA is available at Aetrix Electronics and suitable for battery-operated equipment, portable data-acquisition systems, and communications circuit design requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX4643ETA 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.
The MAX464x family targets low-voltage, high-fidelity analog signal routing - specifically engineered for portable instrumentation, audio interfaces, and sensor multiplexing where rail-to-rail operation, low leakage, and guaranteed matching are mandatory.
FAQ
What is the maximum supply voltage rating for MAX4643ETA?
The MAX4643ETA has an absolute maximum supply voltage (V+) of +6V, but its specified operational range is +1.8V to +5.5V. Operation above +5.5V risks permanent damage and violates the guaranteed electrical specifications - including RON, leakage, and switching time - documented in the official datasheet. For robust design, limit V+ to ≤5.5V with proper 0.1µF local bypassing.
Does MAX4643ETA support true bidirectional analog signal flow?
Yes, MAX4643ETA supports fully bidirectional analog signal routing: NO1, NC2, and COM1 pins are interchangeable as source or load terminals. The device exhibits identical RON, capacitance, and leakage characteristics regardless of signal direction - confirmed by datasheet notes stating "NO_, NC_, and COM_ pins are identical and interchangeable" and measured parameters applying symmetrically across all analog terminals.
What is the guaranteed break-before-make time for MAX4643ETA?
The MAX4643ETA guarantees a break-before-make (BBM) time of 7ns typical and 10ns maximum over the full –40°C to +85°C temperature range. This parameter applies exclusively to the MAX4643 variant (due to its NO/NC pairing) and ensures no overlap between the turn-off of one switch and turn-on of the other - preventing transient shorts in critical signal-path reconfiguration.
Can MAX4643ETA operate reliably from a +3.3V supply?
Yes, MAX4643ETA is fully specified and guaranteed at +3.3V: RON is 8Ω max, RON matching remains 0.6Ω max, and leakage stays below 0.35nA across temperature. Its +1.8V to +5.5V range makes it ideal for modern 3.3V microcontroller I/O domains - with logic thresholds scaling proportionally (VIH = 2.0V min, VIL = 0.4V max at +3.3V).
How does the charge injection specification of MAX4643ETA impact sample-and-hold design?
With a typical charge injection of 2pC, MAX4643ETA introduces minimal voltage step error on hold capacitors - e.g., only 2mV on a 1nF capacitor. This enables accurate 12–14-bit sampling without additional correction circuitry. The value is measured and guaranteed per datasheet Figure 4, directly supporting precision S/H implementations where low glitch energy is mandatory.
MAX4643ETA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Switch Circuit:
- SPST - NO/NC
- Multiplexer/Demultiplexer Circuit:
- 1:1
- Number of Circuits:
- 2
- On-State Resistance (Max):
- 4Ohm
- Channel-to-Channel Matching (ΔRon):
- 200mOhm
- Voltage - Supply, Single (V+):
- 1.8V ~ 5.5V
- Voltage - Supply, Dual (V±):
- -
- Switch Time (Ton, Toff) (Max):
- 15ns, 8ns
- -3db Bandwidth:
- -
- Charge Injection:
- 2pC
- Channel Capacitance (CS(off), CD(off)):
- 7pF, 7pF
- Current - Leakage (IS(off)) (Max):
- 250pA
- Crosstalk:
- -97dB @ 1MHz
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TDFN (3x3)
MAX4643ETA FAQ
1.How can I place an order for MAX4643ETA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4643ETA 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 MAX4643ETA reliable?
The price and inventory of MAX4643ETA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4643ETA is usually 5 days.
3.What payment methods are accepted for MAX4643ETA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4643ETA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4643ETA?
MAX4643ETA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4643ETA 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 MAX4643ETA?
For technical support, including MAX4643ETA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4643ETA requirements.
6.How does Aetrix verify that MAX4643ETA is sourced from the original manufacturer or authorized distributors?
All MAX4643ETA 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 MAX4643ETA meets industry standards.
7.What is the process for return or replacement of MAX4643ETA?
All MAX4643ETA units undergo pre-shipment inspection (PSI). If there is an issue with MAX4643ETA, 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 MAX4643ETA part is unused and in its original packaging.
Return procedure for MAX4643ETA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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