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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:2,374
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Product details
Overview
The MAX378CWG from Maxim Integrated is an 8-channel single-ended analog multiplexer with series N-channel/P-channel/N-channel fault protection architecture, ±60V continuous input tolerance with ±15V supplies, <2mW power dissipation, and guaranteed break-before-make switching. It serves as a high-reliability signal routing device in industrial data acquisition front ends where sensor overvoltage and power-loss scenarios must be mitigated without external protection circuitry.
For engineers reviewing the MAX378CWG datasheet, MAX378CWG pinout, MAX378CWG application, or MAX378CWG equivalent, this page delivers verified specifications, validated package mapping to 24-pin wide SO, confirmed fault-protection behavior under supply-off conditions, and real-world design implications for leakage-limited sensor interfacing and ±15V rail operation.
Technical Context
The MAX378CWG implements a three-FET series switch structure (N-P-N) that actively blocks fault currents by turning off at least one transistor under overvoltage-whether input exceeds +13.5V or falls below −12V with ±15V supplies, or when V+/V− are unpowered. This architecture enforces nanoamp-level leakage (<100nA) across all fault conditions, including ±75V inputs with supplies off.
Digital control uses TTL/CMOS-compatible inputs (0.8V/2.4V thresholds), operates from ±4.5V to ±18V, and guarantees break-before-make delay of 25–200ns. Its ON resistance (2.0kΩ typ at +25°C, ±15V) and low charge injection (±15V, ±10V input: +500pC/+180pC) directly impact settling time and error in precision amplifier interfaces like the MAX420-based DAQ system shown in Figure 6.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channel Count | 8 single-ended (1-of-8) analog switches |
| Fault Protection | ±60V continuous with ±15V supplies; ±75V with supplies off-prevents damage to sensors and downstream circuitry |
| ON Resistance | 2.0kΩ typical at +25°C, ±15V - defines voltage drop and gain error in low-current signal paths |
| Leakage Current | <100nA OFF-state at ±60V input - ensures minimal crosstalk and offset drift in high-Z amplifier inputs |
| Supply Range | ±4.5V to ±18V - supports industrial rails and enables operation from single +9V to +22V with V− tied to GND |
| Switching Speed | tA = 0.5–1.0µs; tON-tOFF = 25–200ns - determines minimum channel dwell time before valid sampling |
| Power Dissipation | <2mW - eliminates thermal derating concerns in dense PCB layouts |
Pinout & Package
MAX378CWG is housed in a 24-pin wide SO (Small Outline) package per ordering information and Pin Configurations diagram. Pin pitch is 1.27mm (0.050"), body width 7.5mm (0.295"), and total length 15.4mm (0.606"). The substrate may float or connect to V+ per JI CMOS construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1–IN8 | Analog input channels | Single-ended signal sources; each isolated from others when OFF; withstand ±60V continuously with supplies active |
| OUT | Analog output node | Common switched output; fault-protected against overvoltage from any INx; limited to ~−12V to +13.5V swing with ±15V supplies |
| A0, A1, A2 | Binary address inputs | Select one of eight channels; logic thresholds 0.8V/2.4V ensure direct TTL/CMOS drive without pull-ups |
| EN | Enable control | Active-high; disables all channels when low; guarantees all switches OFF if supplies are removed |
| V+, V− | Analog power rails | Support ±4.5V to ±18V; define ON resistance and output voltage range; internal protection FET gates referenced to these rails |
| GND | Digital/analog reference | Common ground for logic inputs and substrate tie; forms isolation barrier between digital and analog sections |
Key Features
| Feature | Design Value |
|---|---|
| Fault current limiting | Sub-microamp leakage (<100nA) during ±75V input with supplies off-eliminates need for external TVS or current-limiting resistors |
| Power-loss safety | All channels automatically turn OFF when V+/V− are unpowered-prevents backfeeding and maintains channel isolation |
| Overvoltage shutdown | ON channel disables if input exceeds +13.5V or −12V with ±15V supplies-protects downstream S/H or ADC inputs |
| TTL/CMOS compatibility | 0.8V/2.4V logic thresholds across full temperature range-enables direct interface with microcontrollers and FPGA I/O |
| Latchup immunity | Monolithic CMOS construction with junction isolation-guarantees no latchup under ESD or overvoltage stress |
Applications
| Data Acquisition Systems | Industrial Process Control |
|---|---|
Use Scenario: Multiplexing thermocouple, strain gauge, and 4–20mA loop signals into a single precision op-amp front end (e.g., MAX420). IC Role / Device Role / Timing Role: Signal selector with fault-isolated channel switching; enables software zero/gain calibration via grounded or reference-connected unused channels. Use Value: Sub-20µV total error (RDS(ON) × IOUT(ON)) allows direct digitization of µV-level thermocouple outputs without preamplification. |
Use Scenario: Routing sensor outputs from multiple PLC I/O modules to centralized monitoring hardware in hazardous environments. IC Role / Device Role / Timing Role: High-voltage tolerant analog switch ensuring uninterrupted signal integrity despite field wiring faults or accidental 24V/48V misconnections. Use Value: ±60V continuous fault rating prevents field failures caused by induced transients or grounding mismatches in long cable runs. |
| Avionics Test Equipment | Signal Routing Between Systems |
Use Scenario: Switching between flight-critical sensor simulators (e.g., pitot-static, inertial) during bench validation of avionics LRUs. IC Role / Device Role / Timing Role: Fault-protected multiplexer enabling hot-swap reconfiguration without powering down test fixtures or risking simulator damage. Use Value: Nanoamp leakage during supply-off state preserves calibration integrity and avoids false triggers in high-impedance sensor simulation circuits. |
Use Scenario: Isolating and routing analog signals between legacy instrumentation (±15V) and modern low-voltage (±5V) data loggers. IC Role / Device Role / Timing Role: Level-adapting analog switch supporting dual-supply operation (e.g., V+ = +15V, V− = 0V) while maintaining break-before-make timing. Use Value: Wide ±4.5V to ±18V supply range permits direct integration into mixed-rail systems without level-shifting circuitry. |
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 supply-off blocking | Suitable only in benign, fully powered environments with external clamping; cannot replace MAX378CWG in fault-prone sensor interfaces | Select only when cost sensitivity outweighs reliability requirements and overvoltage risk is eliminated by system design |
| MAX398 | Fault-protected (±40V); 8-channel; 100Ω RDS(ON); requires external enable logic for supply-off safety | Lower ON resistance benefits low-impedance sources; reduced fault margin limits use in high-transient industrial settings | Prefer when lower conduction loss is critical and ±40V fault rating suffices; verify external disable circuit meets same safety goals |
Compared with ADG508A and MAX398, the MAX378CWG uniquely combines ±60V continuous fault tolerance, automatic supply-off channel disable, and sub-100nA leakage-making it the only choice for unattended, high-reliability sensor multiplexing where external protection is impractical.
Availability
MAX378CWG is available at Aetrix Electronics and suitable for industrial process control, avionics test equipment, and data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.
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 precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX378CWG belongs to Maxim's fault-protected analog switch family, engineered specifically for robust signal routing in harsh environments where sensor overvoltage, power interruption, and long-term reliability are primary design constraints.
FAQ
What is the maximum continuous input voltage the MAX378CWG can withstand with its ±15V supplies active?
The MAX378CWG supports ±60V continuous analog input voltage with ±15V supplies applied. This rating is specified in the Absolute Maximum Ratings table and confirmed in the Fault Protection Circuitry section. Operation beyond ±60V risks permanent damage, though typical performance extends to ±75V transiently. The ±60V limit arises from internal power dissipation constraints in the series FET structure-not from breakdown voltage alone.
Does the MAX378CWG remain safe if its V+ and V− supplies are turned off while analog inputs remain energized?
Yes-the MAX378CWG is explicitly designed for this condition. When V+ and V− are unpowered, all channels turn OFF automatically, and input leakage remains below 100nA even at ±75V input. This behavior is enabled by the series N-P-N FET structure whose gates default to ground, ensuring intrinsic blocking without external circuitry. Figures 7 and 8 in the datasheet validate this operation.
What is the ON resistance specification for the MAX378CWG and how does it affect signal accuracy?
The MAX378CWG has a typical ON resistance of 2.0kΩ at +25°C with ±15V supplies. In a data acquisition system driving a high-impedance amplifier input, this RDS(ON) interacts with output leakage current (2nA typ) and op-amp bias current to produce voltage error-e.g., 18µV in the MAX420-based example. Lower RDS(ON) would reduce this error, but the 2.0kΩ value balances fault protection, power efficiency, and process scalability.
Can the MAX378CWG operate from a single +12V supply instead of dual ±15V rails?
Yes-the MAX378CWG supports single-supply operation from +9V to +22V. To do so, connect V− to GND and apply the positive rail to V+. Digital thresholds remain compatible with TTL/CMOS logic, and analog output swing adjusts to approximately +3.5V to −2V (i.e., 0V to +3.5V relative to GND). This configuration is explicitly validated in the "Operation with Supply Voltage Other than ±15V" section.
Is the MAX378CWG pin-compatible with other packages in the MAX378 family, such as the DIP or CERDIP versions?
No-the MAX378CWG uses a 24-pin wide SO package, while MAX378CPE is a 16-pin plastic DIP and MAX378CJE is a 16-pin CERDIP. Pin counts, layouts, and pin functions differ significantly: the wide SO version adds NC pins and relocates several I/Os (e.g., IN5–IN8 appear on pins 13–16 in SO vs. 12–15 in DIP). Direct PCB replacement is not possible without layout revision.
MAX378CWG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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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