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Analog Devices Inc./Maxim Integrated MAX379CWG
- Part No.:
- MAX379CWG
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX379CWG.pdf
- Description:
- IC SWITCH SP4TX2 3.5KOHM 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,648
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Product details
Overview
MAX379CWG from Maxim Integrated is a 4-channel differential (2-of-8) analog multiplexer with series N-channel/P-channel/N-channel fault protection, ±60V continuous input tolerance with ±15V supplies, <2mW power dissipation, and break-before-make switching - used in avionics test equipment for routing high-voltage sensor signals while maintaining isolation during power loss.
For engineers reviewing the MAX379CWG datasheet, MAX379CWG pinout, MAX379CWG application, or MAX379CWG equivalent, this page delivers verified specifications, validated pin functions, confirmed fault-protection behavior under off-supply conditions, and real-world design implications for industrial signal routing and data acquisition front ends.
Technical Context
The MAX379CWG implements a triple-FET series switch architecture that actively blocks overvoltage by turning off either the N-channel or P-channel device depending on polarity, limiting leakage to <50nA under ±60V fault with supplies on and <20µA transient (decaying to <50nA) under ±75V with supplies off. Its digital interface accepts TTL/CMOS logic levels (0.8V/2.4V thresholds) without pull-ups and guarantees break-before-make timing of 25–200ns.
It operates from ±4.5V to ±18V dual supplies, supports demultiplexer mode with full fault protection, and delivers matched RDS(ON) (±2% at +10V, ±3% at −10V) across all four differential channels. Channel-to-channel crosstalk exceeds 70dB at 100kHz with 1.5kΩ load, and OFF isolation reaches 74dB at same frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Configuration | 4-channel differential (2-of-8) analog multiplexer - selects one of four differential input pairs to two outputs (OUTA/OUTB) |
| Fault Protection | ±75V input with supplies off; ±60V continuous with ±15V supplies - prevents sensor damage and maintains nanoamp-level isolation |
| ON Resistance | 2.0kΩ typical at +25°C, ±10V analog input - ensures low gain error in precision DAQ front ends |
| Leakage Current | <50nA OFF output leakage (±10V), <20µA transient (±60V, decays to <50nA) - preserves signal integrity during fault events |
| Supply Range | ±4.5V to ±18V - enables operation from ±5V up to ±15V rails without redesigning bias networks |
| Switching Speed | 600ns channel-to-channel, 25–200ns break-before-make - avoids input-to-input shorts in multi-sensor systems |
| Logic Compatibility | TTL/CMOS inputs (0.8V/2.4V thresholds), no pull-up resistors required - simplifies interface with microcontrollers and FPGAs |
Pinout & Package
MAX379CWG is housed in a 24-pin wide SOIC package (7.6mm × 10.65mm body, 1.27mm pitch), with exposed pad not electrically connected. Pin functions are validated per Maxim's official SO pin diagram (Rev 1, 8/94).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0, A1 | Channel select address inputs | Binary-coded selection of one of four differential channels (00→CH1, 11→CH4); referenced to GND |
| EN | Enable control input | Active-high logic; disables all channels when low - critical for system-level fault containment |
| IN1A–IN4A, IN1B–IN4B | Differential analog inputs | Four fully isolated differential input pairs; each pair routed independently to OUTA/OUTB |
| OUTA, OUTB | Differential analog outputs | Single-ended output configuration not supported; requires balanced loading for optimal CMRR |
| V+, V− | Analog supply rails | Support ±4.5V to ±18V; output swing limited to ~1.5V below V+ and ~3V above V− |
| GND | Analog ground reference | Separate from digital ground plane; forms shield between analog/digital sections (>100dB isolation) |
| N.C. | No-connect pins | Pins 4, 5, 6, 13, 14, 15, 19, 20, 21, 22 - must remain unconnected per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Fault-protected architecture | Triple-FET series switch limits fault current to nanoamps - eliminates need for external clamping diodes or current-limiting resistors |
| Power-off protection | All channels auto-disable when V+/V− removed - draws <20µA from ±75V inputs, preserving sensor integrity |
| Overvoltage shutdown | ON channel turns off if input exceeds ±13.5V/+13.5V (with ±15V supplies) - prevents output overdrive into downstream S/H or ADC |
| Latchup-proof construction | Junction-isolated CMOS process withstands >±60V transients without destructive latchup - suitable for harsh industrial environments |
| Low charge injection | +525pC max (±15V, +10V input) - minimizes voltage glitch on high-Z loads like precision op-amp inputs |
Applications
| Avionics Test Equipment | Data Acquisition Systems |
|---|---|
Use Scenario: Routing multiple high-voltage sensor outputs (e.g., accelerometers, pressure transducers) to shared test instrumentation during aircraft subsystem validation. IC Role / Device Role / Timing Role: Differential analog multiplexer enabling sequential sampling of isolated sensor pairs while surviving ±60V faults during power cycling. Use Value: Eliminates need for manual reconnection or relay-based switching; maintains ±75V isolation with supplies off to prevent ground-loop-induced measurement errors. |
Use Scenario: Front-end signal conditioning for 16-bit+ data loggers acquiring thermocouple, strain gauge, and 4–20mA loop signals in factory automation. IC Role / Device Role / Timing Role: Fault-protected channel selector feeding programmable-gain amplifier (e.g., MAX420), ensuring sub-µV offset error propagation. Use Value: Enables software zero/gain calibration via grounded/VR-referenced channels; <2nA ON leakage contributes <18µV max error even with 40µV/°C thermocouples. |
| Industrial Process Control | Signal Routing Between Systems |
Use Scenario: Isolating fieldbus-connected analog I/O modules from PLC backplanes where supply sequencing mismatches cause transient overvoltages. IC Role / Device Role / Timing Role: High-voltage analog switch providing galvanic separation between distributed sensor networks and centralized controllers. Use Value: Survives ±60V continuous input during brownouts; prevents fault currents from damaging 4–20mA transmitters or corrupting HART communication. |
Use Scenario: Interfacing legacy analog test gear (e.g., oscilloscopes, spectrum analyzers) with modern FPGA-based signal generators requiring bidirectional routing. IC Role / Device Role / Timing Role: Bidirectional differential multiplexer supporting both mux and demux modes with identical fault protection in either direction. Use Value: Enables reconfigurable test fixtures without hardware changes; break-before-make prevents short-circuits when switching between signal sources. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential analog multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADG5204BRUZ | 4-channel differential, ±22V max analog input, 120Ω RDS(ON), no power-off protection - requires external fault clamps | Suitable for lower-voltage (<±15V), space-constrained PCBs; lacks ±75V off-supply tolerance | Select when cost and size outweigh fault robustness; verify external protection meets system safety standards. |
| TMUX1308PWR | 8-channel single-ended, ±16.5V analog range, 4.5Ω RDS(ON), no fault protection - designed for low-RON, not high-voltage resilience | Better for battery-powered portable DAQ; cannot replace MAX379CWG in avionics or industrial settings with >±20V transients | Choose only for low-voltage, high-bandwidth applications where fault events are mitigated upstream. |
Compared with ADG5204BRUZ and TMUX1308PWR, the MAX379CWG uniquely delivers guaranteed ±75V input survival with supplies off, making it irreplaceable in safety-critical signal routing where external protection adds cost, board area, and failure points.
Availability
MAX379CWG is available at Aetrix Electronics and suitable for avionics test equipment, industrial process control systems, and high-reliability data acquisition requiring stable component supply across extended temperature ranges (0°C to +70°C).
Supply support for MAX379CWG 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 and mixed-signal ICs for demanding industrial, automotive, and communications applications.
The MAX379CWG belongs to Maxim's fault-protected analog switch family, engineered specifically for signal routing in environments where sensors remain powered during system maintenance or brownouts.
FAQ
What is the maximum continuous input voltage the MAX379CWG supports with its power supplies active?
The MAX379CWG supports ±60V continuous analog input voltage when operated with ±15V supplies. This rating is guaranteed across the full 0°C to +70°C temperature range and reflects the device's ability to block fault currents while maintaining nanoamp-level leakage - a key differentiator from first-generation fault-protected muxes limited to ±35V.
Does the MAX379CWG retain fault protection when V+ and V− are disconnected?
Yes, the MAX379CWG retains full fault protection with supplies off: it withstands ±75V continuous input voltage and draws less than 20µA leakage current. Its series N/P/N FET structure forces all channels into high-impedance state, protecting both upstream sensors and downstream circuitry - a capability explicitly verified in Figures 7 and 8 of the datasheet.
Can the MAX379CWG be used in demultiplexer mode, and does fault protection apply?
Yes, the MAX379CWG functions as a demultiplexer with input applied to OUTA/OUTB and outputs taken from INxA/INxB pins. Fault protection remains fully active in demux mode - including power-off isolation and overvoltage blocking - unlike earlier fault-protected muxes that lose protection when reversed, as confirmed in the "Operation as a Demultiplexer" section.
What is the guaranteed break-before-make delay for the MAX379CWG?
The MAX379CWG guarantees 25ns to 200ns break-before-make delay (tOPEN) at +25°C, preventing momentary input-to-input shorts during channel switching. This timing is independent of supply voltage and remains functional down to ±4.5V rails, ensuring reliable operation in brownout conditions without compromising signal integrity.
How does the MAX379CWG's ON-resistance matching affect precision measurement accuracy?
The MAX379CWG exhibits ±2% RDS(ON) matching across channels at +10V analog input, rising to ±3% at −10V. This tight matching minimizes gain error variation between channels - critical in multi-sensor DAQ systems where calibration coefficients must remain stable across all selected inputs, as demonstrated in Figure 6's error calculation (VERR = RDS(ON) × IOUT(ON)).
MAX379CWG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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 FAQ
1.How can I place an order for MAX379CWG through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX379CWG 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 reliable?
The price and inventory of MAX379CWG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX379CWG is usually 5 days.
3.What payment methods are accepted for MAX379CWG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX379CWG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX379CWG?
MAX379CWG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX379CWG 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?
For technical support, including MAX379CWG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX379CWG requirements.
6.How does Aetrix verify that MAX379CWG is sourced from the original manufacturer or authorized distributors?
All MAX379CWG 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 meets industry standards.
7.What is the process for return or replacement of MAX379CWG?
All MAX379CWG units undergo pre-shipment inspection (PSI). If there is an issue with MAX379CWG, 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 part is unused and in its original packaging.
Return procedure for MAX379CWG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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