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Analog Devices Inc./Maxim Integrated MAX378EWG+
- Part No.:
- MAX378EWG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX378EWG+.pdf
- Description:
- IC MUX 8:1 3.5KOHM 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,130
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Product details
Overview
MAX378EWG+ 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 industrial signal routing. It supports ±4.5V to ±18V dual supplies, delivers <2 mW power dissipation, guarantees break-before-make switching, and withstands ±60V continuous input voltage with power applied and ±75V with supplies off - enabling robust data acquisition in avionics test and process control systems.
For engineers reviewing the MAX378EWG+ datasheet, MAX378EWG+ pinout, MAX378EWG+ application, or MAX378EWG+ equivalent, this page provides verified technical context, real-world leakage behavior under overvoltage, confirmed ON-resistance vs. analog input voltage, truth-table-validated channel selection logic, and precise package mapping to 24-pin wide SO (SOIC-W) with exposed pad.
Technical Context
The MAX378EWG+ implements a triple-FET series switch structure (N-P-N) that actively blocks fault currents by turning off at least one transistor under overvoltage conditions - unlike simple current-limiting schemes. This architecture ensures nanoamp-level input leakage (<100 nA) across ±75V input range with supplies off and maintains isolation even when external sources remain live during system power-down.
Its digital interface operates with TTL/CMOS-compatible thresholds (0.8V low / 2.4V high), requires no pull-ups, and remains stable across supply voltages from ±4.5V to ±18V. Break-before-make timing is guaranteed at 25–200 ns, and charge injection is characterized per supply/analog voltage (e.g., +500 pC at ±15V/+10V input), directly impacting settling accuracy in precision front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channel Count & Type | 8-channel single-ended (1-of-8) analog multiplexer - selects one of eight inputs to common output |
| Fault Protection | ±75V input with supplies off; ±60V continuous with ±15V supplies - prevents sensor damage and maintains isolation |
| ON Resistance | 2.0 kΩ typical at +25°C, ±15V supplies - defines voltage error in high-Z signal paths (e.g., thermocouple front-ends) |
| Leakage Current | ±50 nA max OFF-input leakage at ±10V, ±15V supplies - critical for sub-µV error budgeting in precision DAQ |
| Supply Range | ±4.5V to ±18V dual supply - supports industrial rails and enables ±5V operation with 1.5V output headroom |
| Switching Speed | 600 ns typical channel-to-channel access time; 200 ns break-before-make delay - avoids input-to-input shorts |
| Digital Compatibility | TTL/CMOS logic thresholds (0.8V/2.4V); no pull-up resistors required - simplifies microcontroller interfacing |
Pinout & Package
MAX378EWG+ is housed in a 24-pin wide SO (SOIC-W) package with 0.300-inch body width and exposed thermal pad. 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 19), and IN1–IN8 (pins 12–15, 17, 18, 20–23) follow the official Maxim pinout diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0, A1, A2 | Binary address inputs | Selects one of eight channels (000 = IN1, 111 = IN8); logic thresholds 0.8V/2.4V ensure direct MCU connection |
| EN | Enable input | Active-high; disables all switches when low - used for power-gating or system-level enable control |
| OUT | Analog output | Common output node; supports ±13.5V max swing with ±15V supplies due to FET threshold limits |
| IN1–IN8 | Analog inputs | Single-ended signal sources; each protected against ±75V faults regardless of supply state |
| V+, V− | Power supply rails | Support ±4.5V to ±18V; output swing limited to ~1.5V below V+ and ~3V above V− |
| GND | Ground reference | Logic and substrate reference; forms isolation barrier between digital and analog sections (>100 dB) |
Key Features
| Feature | Design Value |
|---|---|
| Fault-protected architecture | Triple N-P-N FET structure limits input fault current to <100 nA - eliminates need for external clamps or current limiters |
| Power-off protection | All channels automatically turn OFF when V+/V− are removed - prevents back-driving and preserves sensor integrity |
| Overvoltage shutdown | ON channel disables if input exceeds ±13.5V/-12V (with ±15V supplies) - protects downstream S/H or ADC inputs |
| Latchup-proof design | Junction-isolated CMOS process with ESD diodes rated to ±4V beyond supplies - ensures reliability in noisy environments |
| Low-power operation | <2 mW total dissipation at ±15V - enables use in thermally constrained industrial modules without heatsinking |
Applications
| Data Acquisition Systems | Industrial Process Control |
|---|---|
Use Scenario: Multiplexing thermocouple, strain gauge, and 4–20 mA loop signals into a single precision op-amp front-end. IC Role / Device Role / Timing Role: Signal selector with fault isolation; performs channel selection prior to programmable-gain amplification. Use Value: Enables software zero/gain calibration using grounded and reference channels - reduces system offset error to <18 µV without preamplification. |
Use Scenario: Routing sensor outputs from multiple PLC I/O modules to centralized monitoring hardware. IC Role / Device Role / Timing Role: High-voltage analog switch protecting downstream ADCs from field-wiring transients and miswiring. Use Value: Withstands ±60V continuous overvoltage during maintenance while powered down - eliminates field replacement of damaged muxes. |
| Avionics Test Equipment | Signal Routing Between Systems |
Use Scenario: Switching between flight-critical sensor simulators and real aircraft bus interfaces during ground testing. IC Role / Device Role / Timing Role: Fault-isolated signal path selector ensuring no cross-talk or latchup during hot-swap events. Use Value: Break-before-make delay (25–200 ns) prevents shorting between simulator and bus - maintains MIL-STD-704 compliance. |
Use Scenario: Interfacing legacy analog instrumentation with modern digital controllers via shared signal backplanes. IC Role / Device Role / Timing Role: Level-shifting and isolation buffer enabling mixed-supply domain communication. Use Value: Operates from ±5V to ±18V supplies - bridges 5V microcontrollers to ±15V industrial sensors without level translators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADG1408BRUZ | 8-channel, ±15V supply, 4.7 Ω RDS(ON), but only ±25V fault rating with supplies on; no power-off fault blocking | Suitable for low-RON audio or RF routing, not for ±60V industrial field wiring | Choose MAX378EWG+ when field-wire overvoltage protection is mandatory; ADG1408BRUZ only for clean lab environments. |
| TMUX6208RTER | 8-channel, ±16.5V supply, 3.5 Ω RDS(ON), ±65V fault rating with supplies on, but no guaranteed power-off blocking | Optimized for low-leakage battery-powered systems; lacks validated ±75V off-state protection | MAX378EWG+ is preferred where sensors remain live during system shutdown - TMUX6208RTER requires external protection. |
Compared with ADG1408BRUZ and TMUX6208RTER, the MAX378EWG+ uniquely guarantees sub-100nA leakage at ±75V with supplies off - a non-negotiable requirement for unattended industrial data loggers and avionics test rigs where field wiring faults occur independently of system power state.
Availability
MAX378EWG+ is available at Aetrix Electronics and suitable for data acquisition systems, industrial process control, avionics test equipment, and cross-system signal routing requiring stable component supply across extended temperature ranges (-40°C to +85°C).
Supply support for MAX378EWG+ 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-reliability analog and mixed-signal ICs for harsh-environment applications, with expertise in fault-tolerant circuit architectures and precision signal conditioning.
The MAX378EWG+ belongs to Maxim's fault-protected analog multiplexer product line, engineered specifically for industrial and aerospace signal routing where sensor survivability during power loss or wiring faults is mission-critical.
FAQ
What is the maximum continuous input voltage the MAX378EWG+ can withstand with its power supplies turned off?
The MAX378EWG+ is rated for ±75V continuous input voltage with V+ and V− supplies disconnected. Under this condition, all internal switches turn OFF and input leakage remains below 100 nA, protecting both upstream sensors and downstream circuitry. This specification is verified in Figure 5 and Absolute Maximum Ratings table of the official datasheet.
Does the MAX378EWG+ support break-before-make switching, and is it guaranteed across temperature?
Yes, break-before-make operation is guaranteed for the MAX378EWG+ across its full operating temperature range (-40°C to +85°C). The specified delay is 25–200 ns (typical 600 ns channel-to-channel access time includes this safety margin), preventing input-to-input shorts during address changes - critical for avoiding damage in multi-sensor DAQ systems.
Can the MAX378EWG+ operate from a single +12V supply, and how does that affect its analog output range?
Yes, the MAX378EWG+ supports single-supply operation: tie V− to GND and apply +9V to +22V to V+. With +12V on V+ and V− = 0V, the analog output swing is limited to approximately +10.5V (V+ − 1.5V) and 0V (V− + 0V), since the N-channel FET turns off above V+ − VTH. Digital thresholds remain compatible with standard TTL levels.
What is the typical ON-resistance of the MAX378EWG+, and how does it vary with analog input voltage?
The MAX378EWG+ has a typical ON-resistance of 2.0 kΩ at +25°C with ±15V supplies and ±10V analog input. As shown in Figure MAX3784, RDS(ON) rises sharply beyond ±10V - reaching infinity near +13.5V and -12V - due to FET gate-threshold limiting. This behavior is intrinsic to its fault-protection architecture and must be accounted for in gain-error calculations.
Is the MAX378EWG+ pin-compatible with other members of the MAX378 family, such as the MAX378CPE or MAX378EPE?
No, the MAX378EWG+ is not pin-compatible with the 16-pin DIP variants (e.g., MAX378EPE). It uses a 24-pin wide SO package with different pin assignments - including dedicated N.C. pins and relocated INx terminals - as documented in the "Pin Configurations (continued)" section of the datasheet. PCB layout must be specific to the SOIC-W footprint.
MAX378EWG+ 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
MAX378EWG+ FAQ
1.How can I place an order for MAX378EWG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX378EWG+ 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 MAX378EWG+ reliable?
The price and inventory of MAX378EWG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX378EWG+ is usually 5 days.
3.What payment methods are accepted for MAX378EWG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX378EWG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX378EWG+?
MAX378EWG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX378EWG+ 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 MAX378EWG+?
For technical support, including MAX378EWG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX378EWG+ requirements.
6.How does Aetrix verify that MAX378EWG+ is sourced from the original manufacturer or authorized distributors?
All MAX378EWG+ 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 MAX378EWG+ meets industry standards.
7.What is the process for return or replacement of MAX378EWG+?
All MAX378EWG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX378EWG+, 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 MAX378EWG+ part is unused and in its original packaging.
Return procedure for MAX378EWG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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