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Analog Devices Inc./Maxim Integrated MAX349EAP+T
- Part No.:
- MAX349EAP+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX349EAP+T.pdf
- Description:
- IC MUX 8:1 100OHM 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,938
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Product details
Overview
MAX349EAP+T from Maxim Integrated is an 8-channel, serially controlled, bidirectional analog multiplexer with SPI/QSPI/MICROWIRE interface, 100Ω max on-resistance (±5V supplies), ±2.7V to ±8V dual-supply or +2.7V to +16V single-supply operation, and rail-to-rail signal handling - used in industrial data-acquisition systems requiring low-leakage, high-isolation switching of precision analog signals.
For engineers reviewing the MAX349EAP+T datasheet, MAX349EAP+T pinout, MAX349EAP+T application, or MAX349EAP+T equivalent, this page delivers verified electrical specs, daisy-chainable serial control timing, ESD-protected digital inputs, temperature-stable on-resistance flatness, and real-world use cases in ATE and avionics signal routing.
Technical Context
The MAX349EAP+T implements an 8-bit shift register architecture synchronized to SCLK's rising edge, with CS-controlled latching on its rising edge - fully compliant with SPI Mode 0 (CPOL=0, CPHA=0). All eight switches are independently controllable via DIN, and DOUT enables daisy-chaining multiple devices without additional GPIOs.
It supports true bidirectional analog signal routing: COM and NO pins are functionally identical, enabling flexible input/output assignment. Switches remain off at power-up due to internal reset, and RESET asynchronously forces all channels open and clears the shift register - critical for fail-safe system initialization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Count & Type | 8 independent SPST analog switches; bidirectional, no channel directionality required |
| On-Resistance (RON) | 100Ω max at ±5V supplies - ensures minimal gain error and voltage drop in precision sensor/ADC front-ends |
| On-Resistance Match | 16Ω max between channels - maintains channel-to-channel signal integrity in multi-sensor scanning |
| Off-Leakage Current | 0.1nA max at +25°C - preserves accuracy in high-impedance pH, thermocouple, or photodiode interfaces |
| Supply Range | ±2.7V to ±8V dual or +2.7V to +16V single - supports legacy ±5V, modern low-voltage, and battery-powered designs |
| Serial Interface | SPI/QSPI/MICROWIRE-compatible 3-wire interface (DIN/SCLK/CS) with DOUT for daisy-chaining - reduces MCU pin count in multi-mux systems |
| ESD Protection | >2kV per Method 3015.7 - enables robust operation in industrial environments without external protection |
Pinout & Package
MAX349EAP+T is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65mm pitch, optimized for compact industrial PCB layouts and thermal performance up to +85°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–4, 6–13, 15–16, 18–20 | Digital I/O & Power | Includes CS (chip select), SCLK (serial clock), DIN/DOUT (data in/out), RESET (asynchronous clear), V+/V−/GND |
| 5 | COM | Common analog terminal - serves as mux output or input; interchangeable with NO pins |
| 6–13 | NO0–NO7 | Eight normally-open analog terminals - each independently switchable to COM; bidirectional signal path |
| 14, 17 | N.C. | No internal connection - must be left unconnected per datasheet; not usable as ground or bypass |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-Rail® Signal Handling | Analog signals swing from V− to V+ without clipping - supports full dynamic range of ±10V sensors or audio line-level signals |
| Break-Before-Make Switching | 2ns typical delay prevents momentary shorting between channels - essential for avoiding signal crosstalk during reconfiguration |
| Asynchronous RESET Input | Drives all switches open and clears shift register regardless of SCLK/CS state - enables deterministic startup and fault recovery |
| TTL/CMOS-Compatible Logic Thresholds | 0.8V/2.4V thresholds at ±5V or +5V supply - eliminates level-shifting when interfacing with standard microcontrollers |
| Low Charge Injection (100pC typ) | Minimizes voltage glitch on high-impedance nodes during switching - critical for sample-and-hold and precision DAC output buffering |
Applications
| Industrial Data-Acquisition Systems | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Scanning 8 thermocouple or RTD inputs into a single high-resolution ADC in PLC or DAQ modules. IC Role / Device Role / Timing Role: Serially controlled analog mux routing conditioned sensor signals to ADC input; CS-latched configuration ensures synchronous channel updates. Use Value: 0.1nA off-leakage prevents measurement drift; 16Ω RON match minimizes channel-to-channel gain mismatch across temperature. |
Use Scenario: Routing stimulus signals and DUT responses across multiple test sites in semiconductor functional testers. IC Role / Device Role / Timing Role: Bidirectional signal path for sourcing and sensing; daisy-chained DOUT enables single-SPI-bus control of dozens of MAX349EAP+T units. Use Value: >90dB off-isolation and <–90dB crosstalk suppress false triggers; 2.1MHz SCLK supports sub-µs channel switching. |
| Avionics Signal Management | Audio Signal Routing |
Use Scenario: Multiplexing discrete cockpit sensor outputs (pressure, altitude, attitude) into centralized flight data recorders. IC Role / Device Role / Timing Role: High-reliability analog switch with guaranteed –40°C to +85°C operation; RESET ensures known state after power cycling. Use Value: ±8V dual-supply support matches aircraft 28VDC-derived rails; >2kV ESD withstand protects against static discharge in dry cabin environments. |
Use Scenario: Selecting between multiple analog audio sources (mic, line-in, Bluetooth DAC) before amplification in pro-audio mixers. IC Role / Device Role / Timing Role: Rail-to-rail signal handling preserves full audio swing (±5V); low THD (<0.01% at 1kHz) avoids audible distortion. Use Value: 100Ω RON introduces negligible insertion loss; flat 10Ω RON variation over signal range prevents tonal coloration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADG708BRUZ | 8-channel CMOS mux, 4.5Ω on-resistance, but only +1.8V to +5.5V single-supply operation; no dual-supply capability | Restricted to low-voltage, single-rail systems; unsuitable for ±5V or bipolar signal routing | Select when ultra-low RON and low supply voltage are prioritized over rail-to-rail analog range and dual-supply flexibility |
| TMUX1308PWR | 8-channel mux with 1.8Ω RON, 1.08V to 5.5V supply, but no RESET pin and no daisy-chain DOUT; logic thresholds fixed at 0.5×VCC | Lacks asynchronous reset and serial expansion capability - limits use in safety-critical or scalable multi-mux architectures | Choose for cost-sensitive, high-speed, single-supply consumer applications where deterministic reset and daisy-chaining are unnecessary |
Compared with ADG708BRUZ and TMUX1308PWR, the MAX349EAP+T uniquely combines dual-supply operation, integrated RESET, daisy-chainable serial interface, and guaranteed rail-to-rail performance - making it the only option among the three qualified for industrial and avionics systems requiring wide analog range and fail-safe control.
Availability
MAX349EAP+T is available at Aetrix Electronics and suitable for industrial data-acquisition, automated test equipment, and avionics signal routing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX349EAP+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, automotive, and communications applications.
The MAX349EAP+T belongs to Maxim's serially controlled analog switch family, engineered specifically for high-fidelity, low-leakage, and robustly controlled signal routing in harsh-environment data acquisition and test systems.
FAQ
What is the operating temperature range of the MAX349EAP+T?
The MAX349EAP+T is rated for –40°C to +85°C operation, as indicated by the "E" grade suffix in its part number. This extended temperature range makes it suitable for deployment in industrial control cabinets, outdoor ATE racks, and avionics bays where ambient conditions exceed commercial-grade limits. The device maintains specified on-resistance, leakage, and timing performance across this full range.
Does the MAX349EAP+T support daisy-chaining with other MAX349 or MAX350 devices?
Yes, the MAX349EAP+T supports daisy-chaining via its DOUT pin, which outputs the first bit (D7) of the previously shifted-in data word on the falling edge of SCLK. By connecting DOUT of one device to DIN of the next and tying all CS pins together, a single SPI bus can configure multiple MAX349EAP+T or MAX350 units with synchronized update on CS rising edge.
Can the MAX349EAP+T operate with a single +3.3V supply?
Yes - the MAX349EAP+T supports single-supply operation from +2.7V to +16V. At +3.3V, typical on-resistance rises to ~270Ω (max 500Ω), and analog signal range is 0V to +3.3V. Logic thresholds remain compatible (0.8V/2.4V), and all timing parameters including 2.1MHz SCLK maximum frequency are maintained per datasheet Section 7.
What is the purpose of the N.C. pins (pins 14 and 17) on the MAX349EAP+T?
Pins 14 and 17 on the MAX349EAP+T are explicitly designated as "N.C." (Not Internally Connected) in the datasheet Pin Description table. These pins have no internal bond wire or circuit connection and must be left unconnected on the PCB. They are not intended for grounding, bypassing, or any other function - doing so may compromise package integrity or cause undefined behavior.
How does the RESET pin function on the MAX349EAP+T?
The RESET pin on the MAX349EAP+T is an active-low asynchronous input that forces all eight switches open (off-state) and clears the internal 8-bit shift register to zero - regardless of CS or SCLK state. Holding RESET low during power-up ensures a known, safe default configuration. It is commonly tied to a system supervisor IC or microcontroller GPIO for controlled initialization and fault recovery.
MAX349EAP+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Switch Circuit:
- -
- Multiplexer/Demultiplexer Circuit:
- 8:1
- Number of Circuits:
- 1
- On-State Resistance (Max):
- 100Ohm
- Channel-to-Channel Matching (ΔRon):
- 16Ohm (Max)
- Voltage - Supply, Single (V+):
- 2.7V ~ 16V
- Voltage - Supply, Dual (V±):
- ±2.7V ~ 8V
- Switch Time (Ton, Toff) (Max):
- 275ns, 150ns
- -3db Bandwidth:
- -
- Charge Injection:
- 1pC
- Channel Capacitance (CS(off), CD(off)):
- 2pF, 2pF
- Current - Leakage (IS(off)) (Max):
- 100pA
- Crosstalk:
- -90dB @ 100kHz
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
MAX349EAP+T FAQ
1.How can I place an order for MAX349EAP+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX349EAP+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 MAX349EAP+T reliable?
The price and inventory of MAX349EAP+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX349EAP+T is usually 5 days.
3.What payment methods are accepted for MAX349EAP+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX349EAP+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX349EAP+T?
MAX349EAP+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX349EAP+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 MAX349EAP+T?
For technical support, including MAX349EAP+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX349EAP+T requirements.
6.How does Aetrix verify that MAX349EAP+T is sourced from the original manufacturer or authorized distributors?
All MAX349EAP+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 MAX349EAP+T meets industry standards.
7.What is the process for return or replacement of MAX349EAP+T?
All MAX349EAP+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX349EAP+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 MAX349EAP+T part is unused and in its original packaging.
Return procedure for MAX349EAP+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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