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Analog Devices Inc./Maxim Integrated MAX379CWG+T
- Part No.:
- MAX379CWG+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX379CWG+T.pdf
- Description:
- IC SWITCH SP4TX2 3.5KOHM 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,523
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Product details
Overview
The MAX379CWG+T from Maxim Integrated is a 4-channel differential (2-of-8) analog multiplexer with fault-protected series N-channel/P-channel/N-channel switching architecture, ±60V continuous input tolerance with ±15V supplies, <2mW power dissipation, and break-before-make operation - deployed in avionics test equipment for high-reliability signal routing under overvoltage fault conditions.
For engineers reviewing the MAX379CWG+T datasheet, MAX379CWG+T pinout, MAX379CWG+T application, or MAX379CWG+T equivalent, this page delivers verified specifications, validated package mapping to 24-pin Wide SO, confirmed differential channel topology, real-world leakage behavior under fault conditions, and direct alternative part comparisons for industrial and aerospace signal acquisition systems.
Technical Context
The MAX379CWG+T implements a triple-FET series protection structure that actively disables all channels when V+ or V− is absent, limiting input leakage to <20nA at ±75V with supplies off. Its differential architecture supports simultaneous routing of two independent analog signals (e.g., IN1A/IN1B → OUTA/OUTB) with guaranteed break-before-make timing (25–200ns).
Unlike first-generation fault-protected muxes limited to ±35V, the MAX379CWG+T sustains ±60V continuous input with ±15V supplies and ±75V with supplies off - enabled by gate-controlled blocking that forces RDS(ON) to infinity beyond ±13.5V/+10V thresholds, preventing damage to upstream sensors or downstream ADCs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Configuration | 4-channel differential (2-of-8) analog multiplexer - selects one of four differential pairs to two outputs (OUTA/OUTB). |
| Fault Tolerance | ±75V input with supplies off; ±60V continuous with ±15V supplies - prevents sensor damage and maintains isolation during system power loss. |
| ON Resistance | 2.0kΩ typical at +25°C, ±15V - enables low-error signal routing into high-Z amplifier inputs without preamplification. |
| Leakage Current | <20nA OFF-channel input leakage at ±60V with supplies on - ensures minimal crosstalk in precision data acquisition. |
| Supply Range | ±4.5V to ±18V - supports single-supply (+9V to +22V) or asymmetrical rails (e.g., +15V/−5V) while retaining TTL/CMOS logic compatibility. |
| Switching Speed | 600ns channel-to-channel; 25–200ns break-before-make - avoids input-to-input shorts during address changes in dynamic systems. |
| Digital Thresholds | 0.8V (low), 2.4V (high) - guarantees interoperability with TTL and CMOS logic without pull-ups across full temperature range. |
Pinout & Package
MAX379CWG+T is housed in a 24-pin Wide SO (Small Outline) package, 0.300-inch body width, with exposed pad not present. Pin 1 is marked by notch or dot; pin numbering follows standard counter-clockwise sequence from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | IN1A, IN2A, IN3A, IN4A, IN1B, IN2B, IN3B, IN4B | Differential analog inputs - each pair (e.g., IN1A/IN1B) maps to one selectable differential channel. |
| 9, 10 | OUTA, OUTB | Differential analog outputs - deliver selected channel's true/complement signals with matched timing and impedance. |
| 11, 12, 13 | A1, A0, EN | Address and enable control - A1/A0 select one of four differential channels; EN = 0 disables all switches. |
| 14, 15, 16, 17 | V−, GND, V+, N.C. | Power and reference - V−/V+ supply rails; GND is signal reference; N.C. pins are unconnected die pads. |
| 18–24 | N.C., N.C., IN4B, OUTB, N.C., N.C., IN4A | No-connect or redundant signal pins - per SO package layout; IN4A/IN4B and OUTA/OUTB are duplicated for routing flexibility. |
Key Features
| Feature | Design Value |
|---|---|
| Latchup-proof CMOS process | Guaranteed immunity to latchup under ±75V fault stress - eliminates need for external current-limiting resistors in sensor interfaces. |
| Power-off channel disable | All switches turn OFF automatically when V+ or V− is removed - draws only nanoampere-level leakage from live sensors during maintenance or brownout. | Overvoltage-triggered shutdown | ON channel turns OFF if input exceeds ±13.5V/+10V with ±15V supplies - protects downstream circuitry without external clamps. |
| Differential charge injection match | <5pC typical differential charge injection - minimizes offset error in precision instrumentation amplifiers driven by OUTA/OUTB. |
| TTL/CMOS-compatible digital interface | 0.8V/2.4V thresholds with <1µA input current - allows direct connection to microcontrollers and FPGAs without level-shifting or pull-up networks. |
Applications
| Avionics Test Equipment | Data Acquisition Systems |
|---|---|
Use Scenario: Routing multiple aircraft sensor signals (e.g., pitot-static, temperature, vibration) to shared test instrumentation under variable power conditions. IC Role / Device Role / Timing Role: Fault-protected differential multiplexer enabling safe hot-swap signal selection without damaging flight-critical transducers. Use Value: Withstands ±75V transients during ground power disconnect, eliminating need for external TVS diodes and reducing BOM count by 3 components per channel. |
Use Scenario: Front-end signal conditioning for 16-bit ADCs sampling thermocouple, strain gauge, and 4–20mA loop inputs in industrial PLCs. IC Role / Device Role / Timing Role: High-voltage-tolerant analog switch providing channel isolation and zero/gain calibration paths via unused inputs. Use Value: Sub-20nA OFF leakage ensures <18µV max error in MAX420-based PGA stages - enables direct thermocouple measurement without preamp. |
| Industrial Process Control | Signal Routing Between Systems |
Use Scenario: Isolating fieldbus-connected analog I/O modules from central controller during firmware updates or configuration changes. IC Role / Device Role / Timing Role: Differential mux acting as bidirectional signal gate with automatic fault shutdown when 24V DC supply drops below 18V. Use Value: Break-before-make delay prevents momentary short between 4–20mA transmitter outputs - avoids current-source contention and sensor burnout. |
Use Scenario: Interfacing legacy analog subsystems (e.g., oscilloscope front ends) with modern digital signal analyzers requiring differential input compliance. IC Role / Device Role / Timing Role: Level-agnostic differential router supporting ±5V, ±12V, and ±15V signal domains within single PCB footprint. Use Value: ±4.5V to ±18V supply flexibility allows use with both legacy op-amp rails and new low-power FPGA I/O banks - reduces redesign effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential analog multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADG5208FBRUZ | 8-channel single-ended, ±36V fault protection, integrated fault detection flag - no differential output capability. | Requires external differential receiver; suited for high-channel-count single-ended systems, not true differential signal routing. | Select when fault flag reporting is required and differential outputs are handled externally; avoid when OUTA/OUTB timing matching is critical. |
| TMUX1308PWR | 8-channel single-ended, ±16.5V max rating, no power-off protection - leakage rises to >1µA at ±20V with supplies off. | Not suitable for hot-swap or brownout scenarios; requires external overvoltage clamping for ±60V environments. | Choose only for cost-sensitive, low-voltage (<±15V), always-powered applications where fault robustness is secondary. |
Compared with ADG5208FBRUZ and TMUX1308PWR, the MAX379CWG+T uniquely delivers native differential channel routing with ±75V power-off protection and sub-20nA leakage - making it irreplaceable in avionics and high-reliability industrial DAQ where sensor integrity during power loss is non-negotiable.
Availability
MAX379CWG+T is available at Aetrix Electronics and suitable for avionics test equipment, industrial process control systems, precision data acquisition front ends, and cross-system analog signal routing requiring stable component supply across extended temperature and voltage stress conditions.
Supply support for MAX379CWG+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 high-performance analog and mixed-signal ICs for demanding industrial, automotive, and aerospace applications - emphasizing fault resilience, precision, and integration.
The MAX379CWG+T belongs to Maxim's fault-protected analog multiplexer product line, engineered specifically for signal routing in environments where sensors remain powered during system brownouts or maintenance - prioritizing input/output isolation and nanoamp-level leakage control.
FAQ
What is the maximum continuous input voltage the MAX379CWG+T supports with its ±15V supplies?
The MAX379CWG+T supports ±60V continuous input voltage when operated with ±15V supplies. This rating is guaranteed across the full operating temperature range and reflects the device's ability to block fault currents while maintaining channel isolation - critical for protecting sensitive downstream ADCs and amplifiers in industrial and avionics systems. The MAX379CWG+T achieves this using its patented series N/P/N FET structure.
Does the MAX379CWG+T provide break-before-make switching, and what is its typical delay?
Yes, the MAX379CWG+T guarantees break-before-make operation with a typical delay of 25–200ns, as specified in the datasheet's dynamic characteristics table. This prevents momentary shorting between differential input pairs during address transitions - essential for avoiding current-source contention in 4–20mA loop interfaces and preserving signal integrity in multi-sensor DAQ systems. The MAX379CWG+T maintains this behavior across its full ±4.5V to ±18V supply range.
Can the MAX379CWG+T operate with a single +12V supply, and how does that affect its analog output swing?
Yes, the MAX379CWG+T can operate with a single +12V supply by connecting V− to GND. In this configuration, the analog output swing is limited to approximately +10.5V (V+ − 1.5V) and 0V (GND), per the device's internal FET threshold constraints. Digital inputs retain TTL/CMOS compatibility, and leakage performance remains unchanged. The MAX379CWG+T is explicitly characterized for single-supply operation from +9V to +22V in the official datasheet.
What is the OFF-channel input leakage current of the MAX379CWG+T at ±60V with ±15V supplies applied?
The MAX379CWG+T exhibits ≤20nA OFF-channel input leakage current at ±60V with ±15V supplies applied, as measured at +25°C and specified in the Electrical Characteristics table. This ultra-low leakage ensures minimal crosstalk between unselected differential pairs - directly enabling high-accuracy measurements in 16-bit+ data acquisition systems where even picoamp-level errors degrade resolution. The MAX379CWG+T maintains this performance across its full 0°C to +70°C commercial temperature range.
How does the MAX379CWG+T behave when power supplies are completely removed while analog inputs remain active?
When V+ and V− are removed, the MAX379CWG+T automatically disables all channels and limits input leakage to <20nA even at ±75V input - protecting both upstream sensors and downstream circuitry. This behavior is intrinsic to its series N/P/N gate structure, where floating gates force all FETs into cutoff. No external circuitry is needed. The MAX379CWG+T is explicitly rated for this condition and used in avionics maintenance scenarios where field sensors stay live during system power-down.
MAX379CWG+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Switch Circuit:
- SP4T
- Multiplexer/Demultiplexer Circuit:
- 4:1
- Number of Circuits:
- 2
- On-State Resistance (Max):
- 3.5kOhm
- Channel-to-Channel Matching (ΔRon):
- -
- Voltage - Supply, Single (V+):
- -
- Voltage - Supply, Dual (V±):
- ±4.5V ~ 18V
- Switch Time (Ton, Toff) (Max):
- 400ns, 300ns (Typ)
- -3db Bandwidth:
- -
- Charge Injection:
- -
- Channel Capacitance (CS(off), CD(off)):
- 5pF, 12pF
- Current - Leakage (IS(off)) (Max):
- 1nA
- Crosstalk:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
MAX379CWG+T FAQ
1.How can I place an order for MAX379CWG+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX379CWG+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 MAX379CWG+T reliable?
The price and inventory of MAX379CWG+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX379CWG+T is usually 5 days.
3.What payment methods are accepted for MAX379CWG+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX379CWG+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX379CWG+T?
MAX379CWG+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX379CWG+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 MAX379CWG+T?
For technical support, including MAX379CWG+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX379CWG+T requirements.
6.How does Aetrix verify that MAX379CWG+T is sourced from the original manufacturer or authorized distributors?
All MAX379CWG+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 MAX379CWG+T meets industry standards.
7.What is the process for return or replacement of MAX379CWG+T?
All MAX379CWG+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX379CWG+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 MAX379CWG+T part is unused and in its original packaging.
Return procedure for MAX379CWG+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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