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Analog Devices Inc./Maxim Integrated MAX378EPE+
- Part No.:
- MAX378EPE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX378EPE+.pdf
- Description:
- IC MUX 8:1 3.5KOHM 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,554
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Product details
Overview
MAX378EPE+ 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 safely managed.
For engineers reviewing the MAX378EPE+ datasheet, MAX378EPE+ pinout, MAX378EPE+ application, or MAX378EPE+ equivalent, this page delivers verified electrical parameters, fault-protection behavior under supply-off conditions, leakage current vs. input voltage curves, ON-resistance matching across channels, and real-world design implications for thermocouple and 4–20mA loop interfacing.
Technical Context
The MAX378EPE+ 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 ±75V with supplies off or ±60V with ±15V applied. This differs fundamentally from passive current-limiting schemes used in first-generation fault-protected muxes.
Its digital interface operates with TTL/CMOS-compatible thresholds (0.8V/2.4V), requires no pull-ups, and maintains sub-µA leakage under all fault conditions-including when V+ and V− are unpowered. Break-before-make timing is guaranteed at 25ns–200ns, preventing input-to-input shorts during channel transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channel Count | 8 single-ended (1-of-8) analog switches |
| Fault Tolerance (Supplies Off) | ±75V continuous input-prevents damage to sensors during system power-down |
| Fault Tolerance (±15V Supplies) | ±60V continuous input-exceeds legacy ±35V limit due to lower power dissipation |
| ON Resistance (TYP) | 2.0kΩ at +25°C, ±15V supplies-enables low-error signal routing into high-Z amplifiers like MAX420 |
| Input Leakage (All Faults) | ≤50nA-limits error contribution in precision DAQ systems using thermocouples or strain gauges |
| Power Supply Range | ±4.5V to ±18V-supports operation from ±5V up to ±18V while maintaining fault protection |
| Enable Delay (tON(EN)) | 400µs max (TYP 750µs)-defines minimum time from EN assertion to valid output settling |
Pinout & Package
MAX378EPE+ is housed in a 16-pin plastic DIP package (0.300" wide), RoHS-compliant, with through-hole mounting. Pin 1 is A1 (MSB address), pin 16 is IN4, and pin 9 is OUT-the common analog output node.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0, A1, A2 | Binary address inputs | Select one of eight input channels (IN1–IN8); logic levels 0.8V/2.4V ensure TTL/CMOS compatibility without pull-ups |
| EN | Active-high enable | Disables all channels when low; threshold matches A0–A2 for consistent logic interface |
| IN1–IN8 | Analog inputs | Single-ended signal sources; each withstands ±75V with supplies off and ±60V with ±15V active |
| OUT | Analog output | Common switched output; limited to ~+13.5V/–12V swing with ±15V supplies due to FET threshold clamping |
| V+, V− | Analog power rails | Supply range ±4.5V to ±18V; output swing = V+ − |VTN| and V− + |VTP| (VTN ≈ 1.5V, VTP ≈ 3V) |
| GND | Digital ground reference | Reference for all logic inputs; physically isolates digital section from analog via internal ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Fault-protected architecture | Series N-P-N FET structure limits fault current to nanoamperes-not milliamperes-under ±75V input with supplies off |
| Power-loss safety | All channels automatically turn OFF when V+ and V− are unpowered, eliminating backfeed and protecting upstream sensors |
| Overvoltage shutdown | ON channel disables if input or output exceeds safe swing (e.g., >+13.5V or <–12V with ±15V supplies), preventing output damage |
| TTL/CMOS compatibility | Logic thresholds fixed at 0.8V (low) and 2.4V (high) across full temperature range-no external biasing required |
| Break-before-make guarantee | Minimum 25ns delay between channel deactivation and activation prevents momentary input shorting in multi-sensor systems |
Applications
| Industrial Data Acquisition | Avionics Test Equipment |
|---|---|
Use Scenario: Multiplexing thermocouple, RTD, and 4–20mA loop signals into a shared precision amplifier and ADC path. IC Role / Device Role / Timing Role: Signal router with fault isolation; handles ±75V transients during sensor hot-plug or power cycling. Use Value: Eliminates need for external clamping diodes or preamplifier protection, reducing BOM count and board area in ruggedized DAQ modules. |
Use Scenario: Switching calibration references and flight sensor outputs in airborne test rigs subject to ESD and supply interruption. IC Role / Device Role / Timing Role: High-voltage analog switch enabling reconfigurable signal paths without manual patch panels. Use Value: Maintains isolation integrity during aircraft battery disconnect events, preventing latch-up or sensor damage from floating inputs. |
| Process Control Systems | Signal Routing Between Systems |
Use Scenario: Routing analog process variables (pressure, flow, level) from field transmitters to distributed control system (DCS) I/O cards. IC Role / Device Role / Timing Role: Fault-tolerant multiplexer ensuring continuity during maintenance-induced power loss on transmitter side. Use Value: Enables "live" sensor replacement without shutting down entire control loop-leakage remains <50nA even at ±60V input. |
Use Scenario: Interfacing legacy instrumentation with modern digitizers where ground potential differences cause common-mode overvoltage. IC Role / Device Role / Timing Role: Isolation barrier with bidirectional analog capability (supports demux mode). Use Value: Allows safe connection of ±15V lab equipment to ±5V embedded controllers without level-shifting circuitry or optocouplers. |
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 typical RDS(ON); no supply-off blocking | Suitable only in benign environments with controlled power sequencing and clamped inputs | Choose ADG508A only when cost is critical and fault exposure is eliminated by system-level design. |
| TMUX6208 | ±60V fault protection with supplies on; but only ±20V with supplies off; 3.5Ω RDS(ON); higher charge injection (1.5pC) | Better for low-RDS(ON) precision apps, but insufficient for ±75V unpowered scenarios like field sensor disconnect | Prefer TMUX6208 when low on-resistance dominates requirements and supply-off fault margin is not needed. |
Compared with ADG508A and TMUX6208, the MAX378EPE+ uniquely guarantees ±75V input survivability with zero supply voltage-making it irreplaceable in industrial and avionics systems where sensor power may persist after controller shutdown.
Availability
MAX378EPE+ is available at Aetrix Electronics and suitable for industrial data acquisition, avionics test equipment, and process control systems requiring stable component supply across extended temperature ranges (–40°C to +85°C) and long-term lifecycle support.
Supply support for MAX378EPE+ 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 MAX378EPE+ belongs to Maxim's fault-protected analog multiplexer family, engineered specifically for signal integrity in harsh environments where sensor overvoltage, power loss, and ground-loop faults are routine operational hazards.
FAQ
What is the maximum analog input voltage the MAX378EPE+ can handle with its power supplies turned off?
The MAX378EPE+ supports continuous ±75V analog input voltage with V+ and V− unpowered. Under this condition, all channels turn OFF and input leakage remains ≤50nA, protecting both upstream sensors and downstream circuitry. This specification is verified per Maxim's Absolute Maximum Ratings table and Typical Operating Characteristics (Figure 4 and Figure 5).
Does the MAX378EPE+ require external pull-up resistors on its address or enable pins?
No, the MAX378EPE+ does not require external pull-up resistors. Its digital inputs (A0, A1, A2, EN) have guaranteed TTL/CMOS-compatible thresholds of 0.8V (low) and 2.4V (high) across the full –40°C to +85°C operating range, and draw ≤1µA input current at all logic levels-enabling direct connection to microcontroller GPIOs or FPGA outputs.
How does the MAX378EPE+ behave during an overvoltage event on an enabled channel?
When an overvoltage occurs on an enabled channel (e.g., input >+13.5V or <–12V with ±15V supplies), the series N-P-N FET structure forces the ON channel to disable-clamping output voltage and limiting current to nanoampere leakage. This behavior is inherent to the gate-drive topology and is documented in Figures 9 and 10 of the MAX378EPE+ datasheet.
Can the MAX378EPE+ be used as a demultiplexer?
Yes, the MAX378EPE+ supports demultiplexer operation: apply the analog signal to the OUT pin and use IN1–IN8 as outputs. It retains full fault protection and guaranteed break-before-make timing in this mode-unlike earlier fault-protected muxes, which lose protection when operated in reverse direction.
What is the typical ON-resistance matching between channels of the MAX378EPE+?
At +25°C with ±15V supplies and ±10V analog input, RDS(ON) matching across all eight channels is ±2% (lowest to highest). At –10V input, matching degrades slightly to ±3%. This tight matching minimizes gain error when routing multiple calibrated sensor signals through the same MAX378EPE+ device.
MAX378EPE+ 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:
- Through Hole
- Supplier Device Package:
- 16-PDIP
MAX378EPE+ FAQ
1.How can I place an order for MAX378EPE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX378EPE+ 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 MAX378EPE+ reliable?
The price and inventory of MAX378EPE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX378EPE+ is usually 5 days.
3.What payment methods are accepted for MAX378EPE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX378EPE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX378EPE+?
MAX378EPE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX378EPE+ 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 MAX378EPE+?
For technical support, including MAX378EPE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX378EPE+ requirements.
6.How does Aetrix verify that MAX378EPE+ is sourced from the original manufacturer or authorized distributors?
All MAX378EPE+ 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 MAX378EPE+ meets industry standards.
7.What is the process for return or replacement of MAX378EPE+?
All MAX378EPE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX378EPE+, 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 MAX378EPE+ part is unused and in its original packaging.
Return procedure for MAX378EPE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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