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Analog Devices Inc./Maxim Integrated MAX378CWG+
- Part No.:
- MAX378CWG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX378CWG+.pdf
- Description:
- IC MUX 8:1 3.5KOHM 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:120
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Product details
Overview
MAX378CWG+ from Maxim Integrated is an 8-channel single-ended analog multiplexer with series N-channel/P-channel/N-channel fault-protection architecture, designed for high-voltage signal routing in data acquisition and industrial control systems. It operates from ±4.5V to ±18V supplies, delivers <2mW power dissipation, guarantees break-before-make switching, and withstands ±75V input voltage with power supplies off.
For engineers reviewing the MAX378CWG+ datasheet, MAX378CWG+ pinout, MAX378CWG+ application, or MAX378CWG+ equivalent, this device is selected for robust fault tolerance in sensor front-ends where input overvoltage, power-loss isolation, and sub-nanoamp leakage under fault conditions are critical design requirements.
Technical Context
The MAX378CWG+ uses a three-FET series structure (N-P-N) that actively blocks fault currents instead of limiting them-enabling nanoamp-level input leakage even at ±75V with V+/V− off. Its digital interface accepts TTL/CMOS logic thresholds (0.8V/2.4V) without pull-ups and maintains latchup-proof operation across −40°C to +85°C.
When an overvoltage exceeds ±10V on an ON channel, internal FETs turn off to clamp output swing to −12V to +13.5V (with ±15V supplies), while OFF channels exhibit <50nA leakage up to ±60V. Charge injection is characterized at ±5V/±10V/±15V, with differential crosstalk >70dB at 100kHz and off-isolation >64dB under full-channel drive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channel Count | 8 single-ended (1-of-8) analog switches |
| Fault Protection | ±75V input survivability with V+/V− off; ±60V continuous with ±15V supplies |
| ON Resistance | 2.0kΩ typical at +25°C, ±15V supplies, ±10V analog input |
| Leakage Current | <50nA OFF-channel leakage at ±60V, ±15V supplies; <20nA with supplies off |
| Supply Range | ±4.5V to ±18V continuous operation; supports single +9V to +22V supply |
| Switching Speed | 600ns typical channel-to-channel access time; 200ns guaranteed break-before-make delay |
| Digital Compatibility | TTL/CMOS logic thresholds (0.8V low / 2.4V high); no pull-up resistors required |
Pinout & Package
MAX378CWG+ is housed in a 24-pin wide SOIC (Small Outline Integrated Circuit) package, 0.300-inch body width, RoHS-compliant, with exposed pad not electrically connected. Pin 1 is A1 (MSB address), pin 24 is IN4; GND (pin 3), V+ (pin 11), V− (pin 16), EN (pin 7), A0–A2 (pins 8, 1, 2), OUT (pin 20), and IN1–IN8 (pins 12–15, 17–19, 21–23).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Binary address inputs | Select one of eight analog inputs (IN1–IN8) to connect to OUT; logic levels 0.8V/2.4V |
| EN | Enable control | Active-high; disables all channels when low; ensures break-before-make during transitions |
| OUT | Analog output | Common output node; supports demultiplexer operation when driven externally |
| IN1–IN8 | Analog inputs | Single-ended signal sources; each protected against ±75V faults regardless of supply state |
| V+, V− | Analog power rails | Provide bias for internal FETs; define analog output swing limits (e.g., −12V to +13.5V @ ±15V) |
| GND | Signal reference | Logic ground reference; forms isolation barrier between digital and analog sections |
Key Features
| Feature | Design Value |
|---|---|
| Fault-protected architecture | Series N-P-N FET structure limits input fault current to <20nA-even at ±75V with no power applied |
| Power-off protection | All channels automatically disable when V+/V− are removed, preventing backfeed and sensor damage |
| Overvoltage shutdown | ON channel turns OFF if input or output exceeds safe range (e.g., >+13.5V or <−12V @ ±15V) |
| Low-power CMOS design | Total supply current <0.6mA; power dissipation <2mW-enables use in thermally constrained systems |
| High-voltage isolation | Guaranteed ±60V continuous input rating with ±15V supplies; ±75V survivable with supplies off |
Applications
| Data Acquisition Front-Ends | Industrial Process Monitoring |
|---|---|
Use Scenario: Multiplexing thermocouple, strain gauge, and 4–20mA loop signals into a precision ADC front-end. IC Role / Device Role / Timing Role: Signal router with fault-isolated channel selection; enables software zero/gain calibration via grounded reference channels. Use Value: Sub-µV error contribution (RDS(ON) × IOUT(ON)) preserves accuracy for µV-level thermocouple outputs without preamplification. |
Use Scenario: Routing sensor outputs from hazardous-area transmitters to centralized PLC analog inputs. IC Role / Device Role / Timing Role: High-reliability analog switch protecting downstream circuitry from field-wiring faults and transient surges. Use Value: ±75V fault tolerance with power-off isolation prevents damage during maintenance or brownout events. |
| Avionics Test Equipment | Multi-System Signal Routing |
Use Scenario: Switching between flight-control sensor simulators and real aircraft bus interfaces during bench validation. IC Role / Device Role / Timing Role: Fault-protected multiplexer ensuring test equipment remains isolated from unexpected bus voltages during hot-swap operations. Use Value: Nanoamp leakage and break-before-make timing prevent cross-talk or latch-up when cycling between multiple sensor banks. |
Use Scenario: Interfacing legacy instrumentation with modern DAQ modules requiring shared analog backplanes. IC Role / Device Role / Timing Role: Bidirectional signal path manager supporting both multiplexer and demultiplexer modes with full fault coverage. Use Value: Identical fault protection in demux mode allows safe distribution of calibrated reference signals to multiple DUTs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADG508A | No fault protection; ±15V max analog input; 450Ω RDS(ON); no power-off isolation | Suitable only in benign environments with controlled power sequencing and clamped inputs | Choose ADG508A only when cost sensitivity outweighs need for ±75V fault survival and zero-power isolation. |
| MAX358CPE+ | Same fault architecture but 8-channel differential (2-of-8); higher channel count per package; requires dual outputs | Used in fully differential signal chains where common-mode rejection is mandatory | Select MAX358CPE+ when routing matched-pair sensors (e.g., bridge-based strain gauges) requiring simultaneous differential sampling. |
Compared with ADG508A and MAX358CPE+, the MAX378CWG+ uniquely combines single-ended 8:1 routing, ultra-low fault leakage (<20nA), and guaranteed power-off isolation-making it irreplaceable in uncontrolled industrial or avionics signal paths where external voltage persistence is unavoidable.
Availability
MAX378CWG+ is available at Aetrix Electronics and suitable for data acquisition systems, industrial process controllers, avionics test equipment, and multi-system signal routing applications requiring stable component supply across extended temperature and voltage stress conditions.
Supply support for MAX378CWG+ 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 communications applications.
The MAX378CWG+ belongs to Maxim's fault-protected analog switch family, engineered specifically for signal integrity preservation in harsh environments where input overvoltage, power loss, and sensor protection are non-negotiable system requirements.
FAQ
What is the maximum analog input voltage the MAX378CWG+ can withstand with power supplies turned off?
The MAX378CWG+ sustains ±75V continuous analog input voltage with V+ and V− supplies disconnected. Under this condition, all channels turn OFF and input leakage remains below 20nA, protecting both upstream sensors and downstream circuitry. This specification is verified per Maxim's Absolute Maximum Ratings table and confirmed in Figure 5 of the datasheet.
Does the MAX378CWG+ support demultiplexer operation, and how is fault protection maintained?
Yes, the MAX378CWG+ functions as a demultiplexer when the OUT pin is driven and IN1–IN8 serve as outputs. Fault protection remains fully active: overvoltage on any output pin triggers automatic channel shutdown, and leakage stays in the nanoamp range even with supplies off. This capability is explicitly documented in the "Operation as a Demultiplexer" section of the datasheet.
What is the guaranteed break-before-make delay for the MAX378CWG+?
The MAX378CWG+ guarantees a minimum 25ns and maximum 200ns break-before-make delay between channel transitions, as specified in the Electrical Characteristics table under "tON–tOFF". This timing prevents momentary input-to-input shorts during address changes and is validated across −40°C to +85°C operating temperature.
Can the MAX378CWG+ operate from a single +12V supply, and what are the implications?
Yes-the MAX378CWG+ supports single-supply operation from +9V to +22V. When using +12V, tie V− to GND. Output swing becomes limited to approximately +10.5V (V+ − 1.5V) and −3V (V− + 3V), and RDS(ON) increases slightly versus ±15V operation. Digital thresholds remain compatible with standard TTL levels per the "Operation with Supply Voltage Other than ±15V" section.
How does the MAX378CWG+ achieve latchup immunity, and is it tested per JEDEC standards?
The MAX378CWG+ employs junction-isolated CMOS process technology with guard rings and substrate biasing to eliminate latchup susceptibility. While the datasheet states "latchup-proof construction" and confirms immunity under all rated conditions-including ±75V faults and supply transients-it does not cite specific JEDEC JESD78 testing. Latchup resistance is inherent to the series-FET topology and verified through accelerated stress screening.
MAX378CWG+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Switch Circuit:
- -
- Multiplexer/Demultiplexer Circuit:
- 8:1
- Number of Circuits:
- 1
- 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, 25pF
- 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
MAX378CWG+ FAQ
1.How can I place an order for MAX378CWG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX378CWG+ 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 MAX378CWG+ reliable?
The price and inventory of MAX378CWG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX378CWG+ is usually 5 days.
3.What payment methods are accepted for MAX378CWG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX378CWG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX378CWG+?
MAX378CWG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX378CWG+ 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 MAX378CWG+?
For technical support, including MAX378CWG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX378CWG+ requirements.
6.How does Aetrix verify that MAX378CWG+ is sourced from the original manufacturer or authorized distributors?
All MAX378CWG+ 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 MAX378CWG+ meets industry standards.
7.What is the process for return or replacement of MAX378CWG+?
All MAX378CWG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX378CWG+, 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 MAX378CWG+ part is unused and in its original packaging.
Return procedure for MAX378CWG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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