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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:
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Product details
Overview
The MAX379CWG+ from Maxim Integrated is a 4-channel differential (2-of-8) analog multiplexer with series N-channel/P-channel/N-channel fault protection, operating from ±4.5V to ±18V supplies, supporting ±60V continuous input voltage with power applied and ±75V with supplies off, and delivering <2 mW power dissipation - used in high-reliability data acquisition front ends where sensor overvoltage and power-loss isolation are critical.
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 supply-off conditions, and real-world design implications for industrial test equipment and avionics signal routing.
Technical Context
The MAX379CWG+ implements a triple-FET series switch architecture (N-P-N) that actively blocks fault currents by turning off at least one transistor under overvoltage, limiting input leakage to <100 nA across ±75V with supplies off and <20 nA at ±60V with ±15V supplies. Its break-before-make timing is guaranteed at 25–200 ns, and digital inputs meet TTL/CMOS thresholds (0.8V/2.4V) without pull-ups.
Unlike first-generation fault-protected muxes limited to ±35V, the MAX379CWG+ sustains ±60V continuous analog input with power on and ±75V with power off - enabled by junction-isolated CMOS process optimization and gate-drive logic that forces all channels OFF when V+/V− are absent. Output swing is clamped to ~−12V to +13.5V with ±15V supplies due to FET threshold voltages (VTN ≈ 1.5V, VTP ≈ 3V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Configuration | 4-channel differential (2-of-8): selects one of four differential pairs (IN1A/IN1B through IN4A/IN4B) to OUTA/OUTB. |
| Fault Protection | ±75V input survivability with V+/V− off; ±60V continuous with ±15V supplies - prevents sensor damage and maintains channel isolation. |
| ON Resistance | Typ. 3.5 kΩ at +25°C (±15V), rising to infinity above ±13.5V/+12V - ensures automatic blocking during overvoltage events. |
| Leakage Current | <100 nA input leakage with supplies off; <20 nA output leakage with ±60V overvoltage and ±15V supplies - preserves signal integrity in high-Z systems. |
| Supply Range | ±4.5V to ±18V continuous operation; supports single +9V to +22V (V− = GND) - enables compatibility with legacy industrial rails and mixed-supply designs. |
| Switching Speed | tA = 0.5–1.0 µs access time; tON-tOFF = 25–200 ns break-before-make delay - avoids input-to-input shorts during channel transitions. |
| Digital Interface | TTL/CMOS-compatible inputs (0.8V/2.4V thresholds); no pull-up resistors required - simplifies interface with microcontrollers and FPGA I/O banks. |
Pinout & Package
MAX379CWG+ is housed in a 24-pin wide SOIC package (package code WG), measuring 7.60 mm × 10.65 mm × 2.65 mm (max), with gull-wing leads and 1.27 mm pitch. The substrate may float or connect to V+ per JI CMOS construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | IN1A, IN2A, IN3A, IN4A | Positive-side inputs of four differential channels - each paired with corresponding B-side pin for true differential selection. |
| 5, 6, 7, 8 | IN1B, IN2B, IN3B, IN4B | Negative-side inputs of four differential channels - referenced to respective A-side pins; not ground-referenced individually. |
| 9, 10 | OUTA, OUTB | Differential output pair - carries selected channel's signal with matched gain/phase response and >100 dB digital-analog isolation. |
| 11 | EN | Active-high enable - disables all channels when low; guarantees all switches OFF if V+/V− are absent, regardless of address state. |
| 12, 13 | A0, A1 | Binary address inputs - select one of four differential channels (00→CH1, 01→CH2, 10→CH3, 11→CH4); no A2 pin (unlike MAX378). |
| 14 | GND | Analog/digital reference plane - forms shielding barrier between digital control and analog signal paths; must be low-impedance. |
| 15, 16 | V+, V− | Separate analog supply rails - define ON-resistance, output swing limits, and fault-protection thresholds; tolerate ±44V differential. |
| 17–24 | N.C. | No-connect pins - electrically isolated; must remain unconnected per datasheet to avoid parasitic coupling or latchup risk. |
Key Features
| Feature | Design Value |
|---|---|
| Fault current limitation | Limits input fault current to <100 nA at ±75V with supplies off - protects thermocouples, strain gauges, and 4–20 mA transmitters from irreversible damage. |
| Automatic power-loss shutdown | Turns all channels OFF when V+/V− drop below operational threshold - eliminates backfeed paths and maintains inter-channel isolation without external supervision. |
| Differential channel integrity | Guarantees matched RDS(ON) and charge injection (<5 pC differential) across selected A/B pairs - preserves common-mode rejection in precision measurement. |
| Overvoltage-triggered blocking | Clamps output swing to −12V/+13.5V with ±15V supplies by turning off N- or P-channel FETs - prevents downstream ADC/S/H saturation or latchup. |
| Break-before-make switching | Ensures 25–200 ns minimum dead time between channel disconnect and reconnect - eliminates momentary input-to-input shorts in multi-sensor systems. |
Applications
| Industrial Data Acquisition | Avionics Test Equipment |
|---|---|
|
Use Scenario: Multiplexing thermocouple, RTD, and 4–20 mA loop signals into a single precision ADC front end in factory-floor PLC modules. IC Role / Device Role / Timing Role: Fault-protected differential analog switch enabling safe hot-swap sensor connection and power-loss immunity during maintenance cycles. Use Value: Eliminates need for external TVS diodes and preamplifier protection stages - reduces BOM count by 3–5 components per channel while maintaining ±75V transient tolerance. |
Use Scenario: Routing calibrated test signals between flight-control sensor simulators and embedded health-monitoring units in ground-test rigs. IC Role / Device Role / Timing Role: High-voltage differential multiplexer ensuring signal fidelity and fault containment during automated functional tests with variable supply states. Use Value: Prevents cross-contamination between test channels during rapid reconfiguration - avoids false failure indications caused by residual overvoltage coupling. |
| Process Control Signal Routing | High-Voltage Sensor Interface |
|
Use Scenario: Isolating and selecting outputs from multiple pressure, flow, and level transmitters in oil-refinery DCS cabinets with shared analog backplanes. IC Role / Device Role / Timing Role: Differential analog switch providing galvanic separation and ±60V continuous fault margin across shared 24V loop-powered infrastructure. Use Value: Enables direct connection to 24V loop transmitters without level-shifting or isolation amplifiers - cuts signal path latency by >2 µs vs. opto-isolated alternatives. |
Use Scenario: Interfacing piezoelectric accelerometers and HV partial-discharge sensors to portable diagnostic instruments operating in ungrounded field environments. IC Role / Device Role / Timing Role: Fault-protected differential multiplexer acting as first-line defense against floating ground potentials and cable-induced transients up to ±75V. Use Value: Sustains functionality during accidental contact with 48V telecom batteries or 60V rail surges - avoids instrument downtime and recalibration after exposure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential analog multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADG1209BRUZ | Single-supply only (±15V max), no fault protection beyond ±25V absolute max; 120 Ω RDS(ON); no power-off channel disable. | Suitable for low-voltage lab-grade instrumentation with controlled environments - lacks ±75V survival capability and automatic power-loss isolation. | Select only when system-level overvoltage protection is implemented externally and supply sequencing is guaranteed. |
| TMUX1309RTER | 3.3V/5V single-supply operation; ±25V fault rating; 500 ns typical break-before-make; no dual-rail support or ±75V off-state tolerance. | Optimized for battery-powered portable meters with low quiescent current - cannot replace MAX379CWG+ in industrial mains-connected or avionics test gear. | Choose for cost-sensitive consumer-grade DAQ where ±60V continuous fault margin is unnecessary and supply rails are strictly regulated. |
Compared with ADG1209BRUZ and TMUX1309RTER, the MAX379CWG+ uniquely combines dual-rail ±18V operation, guaranteed power-off channel disable, and ±75V input survivability - making it irreplaceable in safety-critical, unattended, or field-deployed analog signal routing where external protection adds size, cost, and failure modes.
Availability
MAX379CWG+ is available at Aetrix Electronics and suitable for industrial data acquisition systems, avionics test equipment, process control signal routing, and high-voltage sensor interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.
The MAX379CWG+ belongs to Maxim's fault-protected analog multiplexer product line, engineered specifically for harsh-environment signal routing where sensor overvoltage, power interruption, and channel crosstalk must be eliminated without external circuitry.
FAQ
What is the maximum continuous input voltage the MAX379CWG+ can withstand with its power supplies turned off?
The MAX379CWG+ withstands ±75V continuous input voltage with V+ and V− supplies disconnected - verified per Absolute Maximum Ratings and Typical Operating Characteristics graphs. This allows safe connection to live sensors during system power-down, preventing damage to both the MAX379CWG+ and upstream signal sources like thermocouples or 4–20 mA transmitters.
Does the MAX379CWG+ support single-supply operation, and what are the constraints?
Yes, the MAX379CWG+ operates from a single +9V to +22V supply with V− tied to GND. In this mode, analog output swing is limited to approximately +3.5V to −2V, digital thresholds remain compatible with TTL levels, and fault protection remains active - but ±75V off-state tolerance applies only when V− is truly floating or grounded, not when negative bias is present.
How does the MAX379CWG+ ensure break-before-make switching, and is it guaranteed across temperature?
The MAX379CWG+ guarantees break-before-make action with a minimum 25 ns delay (up to 200 ns) between channel disconnect and reconnect, confirmed across 0°C to +70°C. This is achieved via internal timing control of the triple-FET gate drive - preventing input-to-input shorts even during rapid address changes in multi-sensor scanning systems.
What is the role of the substrate connection in the MAX379CWG+ 24-pin SOIC package?
The substrate of the MAX379CWG+ may be left floating or tied to V+ per JI CMOS construction - this choice affects latchup immunity and ESD robustness. When tied to V+, it enhances immunity to negative transients on V−; when floating, it reduces supply current but requires careful PCB layout to avoid noise coupling into sensitive analog nodes.
Can the MAX379CWG+ be used as a demultiplexer, and how does fault protection behave in that configuration?
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: all channels turn OFF when V+/V− are absent, and ±60V/±75V input tolerances apply identically - unlike earlier fault-protected muxes that lose protection in demux mode.
MAX379CWG+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tube
- 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+ 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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