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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:3,972
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Product details
Overview
MAX378EWG from Maxim Integrated is an 8-channel single-ended analog multiplexer with fault-protected series N/P/N FET architecture, ±60V continuous input tolerance with ±15V supplies, <2mW power dissipation, and break-before-make switching - used in industrial data acquisition front ends where sensor overvoltage protection and signal integrity are critical.
For engineers reviewing the MAX378EWG datasheet, MAX378EWG pinout, MAX378EWG application, or MAX378EWG equivalent, this page delivers verified specifications, validated package mapping (24-pin wide SO), confirmed fault-protection behavior under power-off conditions, and real-world leakage current performance at ±60V/±75V overvoltage.
Technical Context
The MAX378EWG implements a three-FET series structure (N–P–N) that actively blocks fault currents by turning off appropriate transistors when input voltage exceeds V+ − VTH,N or falls below V− + VTH,P, limiting leakage to <50nA across all fault modes. 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.
Unlike first-generation fault-protected muxes, the MAX378EWG sustains ±60V continuous analog input with powered supplies and ±75V with supplies off - enabled by gate-driven isolation rather than passive current limiting. It operates from ±4.5V to ±18V supplies and supports demultiplexer mode with full fault protection retained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channel Count | 8 single-ended (1-of-8) analog switches |
| Fault Protection | ±75V input with supplies off; ±60V continuous with ±15V supplies |
| ON Resistance | 2.0kΩ typical at ±15V supplies, ±10V input - defines voltage error in high-Z signal chains |
| Leakage Current | ≤50nA OFF-channel input leakage at ±60V (25°C) - preserves sensor integrity and system isolation |
| Supply Range | ±4.5V to ±18V - supports industrial rails and asymmetric configurations (e.g., +15V/−5V) |
| Logic Compatibility | TTL/CMOS inputs (0.8V low / 2.4V high thresholds) - no external biasing required |
| Break-Before-Make Delay | 25–200ns - prevents input-to-input shorting during channel transitions |
Pinout & Package
MAX378EWG is housed in a 24-pin wide SO (small-outline) package per package drawing 21-0042A, with 0.300-inch body width, 1.27mm lead pitch, and exposed pad not present. Pin 1 is marked via notch or dot; pin numbering follows standard SO convention (counterclockwise from top-left corner).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Binary address inputs | Select one of eight channels (000–111); logic thresholds 0.8V/2.4V |
| EN | Enable control | Active-high; disables all channels when low; same threshold as address pins |
| IN1–IN8 | Analog inputs | Single-ended signal sources; each protected against ±75V with supplies off |
| OUT | Common analog output | Switched output node; fault-isolated from all inputs when disabled |
| V+, V− | Analog supply rails | Support ±4.5V to ±18V operation; define output swing limits (≈V+−1.5V to V−+3V) |
| GND | Digital ground reference | Reference for logic inputs; isolated from analog section by internal ground plane |
| N.C. | No-connect terminals | Pins 9–12, 15–16, 19–20, 22–23 - must remain unconnected per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Fault-protected architecture | Series N–P–N FET structure limits fault current to nanoampere range - prevents sensor damage during power loss or overvoltage |
| Power-off protection | All channels automatically disable when V+/V− are absent - maintains >120dB channel isolation up to ±75V input |
| Overvoltage shutdown | ON channel turns off if input or output exceeds safe swing (e.g., >+13.5V or <−12V with ±15V supplies) - clamps output to safe voltage |
| Low-power CMOS design | <2mW typical dissipation - enables use in thermally constrained industrial modules without heatsinking |
| Latchup-proof construction | Junction-isolated CMOS process with on-chip ESD protection (±4V beyond supplies) - immune to destructive latchup events |
Applications
| Industrial Data Acquisition | Avionics Test Equipment |
|---|---|
Use Scenario: Multiplexing thermocouple, strain gauge, and 4–20mA loop signals into a shared precision ADC front end. IC Role / Device Role / Timing Role: Fault-protected analog switch routing low-level sensor outputs while blocking ±60V transients from damaged sensors or wiring faults. Use Value: Eliminates need for external protection diodes or preamplifier gain staging - reduces BOM count and improves measurement accuracy (e.g., ≤18µV error with MAX420 op amp). |
Use Scenario: Signal routing between flight-control test benches and multi-sensor calibration rigs operating across wide temperature ranges. IC Role / Device Role / Timing Role: High-reliability multiplexer enabling hot-swap reconfiguration of test signals without powering down entire systems. Use Value: Withstands ±75V input with supplies off - protects test instrumentation during unexpected power sequencing or cable disconnects. |
| Process Control Systems | Signal Routing Between Systems |
Use Scenario: Isolating and selecting analog inputs from distributed PLC I/O modules in hazardous-area monitoring networks. IC Role / Device Role / Timing Role: Industrial-grade analog switch providing galvanic isolation equivalent to discrete protection schemes, but in monolithic form. Use Value: Guarantees <50nA leakage at ±60V - prevents cross-talk and ground-loop errors in multi-node 4–20mA loops. |
Use Scenario: Interfacing legacy sensor arrays to modern DAQ hardware requiring voltage-level translation and fault containment. IC Role / Device Role / Timing Role: Bidirectional analog switch supporting both multiplexer and demultiplexer modes with identical fault protection. Use Value: Enables safe signal injection from high-voltage subsystems into low-voltage receivers - no risk of back-driving or latchup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADG1208BRUZ | 8-channel, ±15V max supply; ±25V fault rating with supplies on; no power-off fault protection | Lower voltage range; unsuitable for ±60V field-wiring fault scenarios | Choose only for lower-voltage, cost-sensitive designs where external protection is acceptable |
| TMUX6208RTER | 8-channel, ±16.5V max supply; ±65V fault rating with supplies on; no guaranteed power-off protection | Higher RON (4.5Ω vs. 2kΩ) but faster switching; lacks sub-nA leakage at ±75V with V+/V− = 0 | Prefer for high-speed, low-RON applications; avoid where sensor power-off survivability is mandatory |
Compared with ADG1208BRUZ and TMUX6208RTER, the MAX378EWG uniquely delivers verified ±75V input tolerance with zero supply voltage - making it the only option among the three for applications requiring guaranteed sensor and system protection during complete power loss.
Availability
MAX378EWG is available at Aetrix Electronics and suitable for industrial data acquisition, avionics test equipment, and process control systems requiring stable component supply, long-term lifecycle support, and guaranteed fault-protection performance across extended temperature ranges.
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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX378EWG belongs to Maxim's fault-protected analog switch product line, designed specifically for harsh-environment signal routing where sensor overvoltage, power-loss resilience, and nanoscale leakage control are non-negotiable.
FAQ
What is the maximum continuous input voltage the MAX378EWG can withstand with its supplies powered?
The MAX378EWG guarantees ±60V continuous analog input voltage with ±15V supplies applied. At ±10V supplies, it supports ±50V; at ±5V supplies, ±35V. These ratings are specified in the Absolute Maximum Ratings table and confirmed in the Electrical Characteristics section under "Analog Input with Multiplexer Power On." The device remains functional and undamaged within these limits, with leakage held to ≤50nA.
Does the MAX378EWG retain fault protection when V+ and V− are disconnected?
Yes - the MAX378EWG provides full fault protection with supplies off, tolerating up to ±75V on any input while drawing only ≤20nA input leakage (per Figure 5 and Electrical Characteristics). This behavior is enabled by its series N–P–N gate structure, which forces all channels into high-impedance cutoff when V+/V− = 0V, preserving isolation and protecting upstream sensors.
What is the ON resistance specification for the MAX378EWG and how does it vary with signal voltage?
The MAX378EWG has a typical ON resistance of 2.0kΩ at ±15V supplies and ±10V analog input (25°C), rising to ~6kΩ near the rail limits (+13.5V/−12V). This variation is documented in Figure 4 ("Drain-Source ON-Resistance vs. Analog Input Voltage") and directly impacts voltage error in high-impedance signal paths - e.g., 2.0kΩ × (2nA + 30pA) = 18µV max error with a MAX420 op amp.
Is the MAX378EWG compatible with TTL and CMOS logic without external components?
Yes - the MAX378EWG features guaranteed logic thresholds of 0.8V (low) and 2.4V (high) across its full temperature range (−40°C to +85°C), ensuring direct compatibility with both TTL and CMOS drivers. No pull-up resistors, level shifters, or external biasing are required, as confirmed in the "Digital Interface Levels" section and Electrical Characteristics table.
Can the MAX378EWG be used as a demultiplexer, and does fault protection apply in that mode?
Yes - the MAX378EWG supports demultiplexer operation with the OUT pin as input and IN1–IN8 as outputs. Break-before-make timing and full fault protection (including ±75V tolerance with supplies off) remain fully active in this configuration, unlike earlier-generation devices. This capability is explicitly described in the "Operation as a Demultiplexer" section of the datasheet.
MAX378EWG 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:
- -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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