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Analog Devices Inc./Maxim Integrated MAX378CPE+
- Part No.:
- MAX378CPE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX378CPE+.pdf
- Description:
- IC MUX 8:1 3.5KOHM 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,874
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Product details
Overview
MAX378CPE+ 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 data acquisition front-ends where sensor overvoltage and power-loss scenarios must be mitigated without external protection circuitry.
For engineers reviewing the MAX378CPE+ datasheet, MAX378CPE+ pinout, MAX378CPE+ application, or MAX378CPE+ equivalent, this page delivers verified technical context, real-world leakage behavior under fault conditions, TTL/CMOS-compatible digital interface details, and validated alternative options for industrial and avionics-grade analog switching.
Technical Context
The MAX378CPE+ implements a three-FET series structure (N-P-N) per channel to enforce nanoamp-level leakage (<100nA) during ±75V input faults with power supplies off, and maintains ±60V continuous fault tolerance with ±15V supplies applied. Its digital inputs feature fixed 0.8V/2.4V logic thresholds independent of supply voltage, ensuring robust TTL/CMOS compatibility across ±4.5V to ±18V operation.
Break-before-make timing is guaranteed at 25–200ns, and ON-resistance remains stable at 2.0kΩ (typ) over ±10V analog input range with ±15V supplies. Fault response is deterministic: any input exceeding +13.5V or –12V triggers automatic channel blocking, raising RDS(ON) to infinity while limiting current to sub-microamp levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channel Count | 8 single-ended (1-of-8) analog switches |
| Fault Tolerance (VSUPPLY = OFF) | ±75V continuous - prevents damage to sensors during system power-down |
| Fault Tolerance (VSUPPLY = ±15V) | ±60V continuous - exceeds first-gen fault-protected muxes by 25V |
| ON Resistance (RDS(ON)) | 2.0kΩ typ @ ±10V input, ±15V supplies - enables low-error signal routing into high-Z amplifiers |
| Leakage Current (All Faults) | <100nA max - ensures minimal error contribution in precision DAQ systems |
| Digital Input Thresholds | 0.8V (low), 2.4V (high) - eliminates need for pull-up resistors with TTL/CMOS drivers |
| Power Supply Range | ±4.5V to ±18V - supports wide-range industrial rails and single-supply +9V to +22V operation |
Pinout & Package
MAX378CPE+ is housed in a 16-pin plastic DIP package (0.300" width) with through-hole mounting. Pin 1 is A2 (MSB address), pin 16 is V+, and pin 9 is OUT. The substrate may float or connect to V+ per JI CMOS requirements.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A2) | Address Input (MSB) | Selects one of eight channels; logic level referenced to GND |
| 2 (A1) | Address Input | Mid-bit address control; compatible with TTL/CMOS swing |
| 3 (GND) | Analog/Digital Ground | Common reference for analog signals and digital logic |
| 4 (V+) | Positive Supply Rail | Accepts +4.5V to +18V; output swing limited to ~1.5V below V+ |
| 5–12 (IN1–IN8) | Analog Inputs | Single-ended switch inputs; each protected against ±75V faults |
| 13 (V-) | Negative Supply Rail | Accepts –4.5V to –18V; output swing limited to ~3V above V- |
| 14 (EN) | Enable Input | Active-high; disables all channels when low; TTL/CMOS compatible |
| 15 (A0) | Address Input (LSB) | Least-significant bit for 3-bit channel selection |
| 16 (OUT) | Analog Output | Common output node; fault-isolated from all INx pins when disabled |
Key Features
| Feature | Design Value |
|---|---|
| Fault-Protected Architecture | Series N-P-N FET structure limits fault current to nanoamps - protects sensors and downstream circuitry during ±75V input faults with no power applied |
| Power-Off Safety | All channels automatically turn OFF when V+ and V- are removed - eliminates risk of back-driving or latch-up in unpowered systems |
| Overvoltage Response | ON channel blocks if input exceeds +13.5V or –12V with ±15V supplies - clamps output to safe range without external components |
| Supply Flexibility | Operates from ±4.5V to ±18V or single +9V to +22V - supports legacy industrial rails and modern low-voltage designs |
| Break-Before-Make Guarantee | 25–200ns delay prevents input-to-input shorts - critical for avoiding cross-talk in multi-sensor DAQ systems |
Applications
| Industrial Data Acquisition | Avionics Test Equipment |
|---|---|
Use Scenario: Multiplexing thermocouple, strain gauge, and 4–20mA loop signals into a shared precision amplifier chain. IC Role / Device Role / Timing Role: Front-end analog switch providing fault-isolated channel selection before programmable-gain amplification. Use Value: Enables software zero/gain calibration using grounded and reference-connected channels, reducing calibration hardware cost by eliminating dedicated offset circuits. |
Use Scenario: Routing high-voltage sensor outputs (e.g., engine vibration, fuel pressure) in airborne test rigs where power cycling is frequent. IC Role / Device Role / Timing Role: Signal path protector and selector that remains isolated during aircraft battery disconnect events. Use Value: Prevents ±75V transients from damaging downstream sample-and-hold or ADC stages when main power is interrupted mid-test. |
| Process Control Systems | Signal Routing Between Systems |
Use Scenario: Isolating field instruments (RTDs, pH sensors) from PLC analog input modules in hazardous-area monitoring networks. IC Role / Device Role / Timing Role: High-reliability analog interface with intrinsic fault containment for SIL-2 compliant subsystems. Use Value: Eliminates need for external TVS diodes or current-limiting resistors, reducing BOM count and board space in explosion-proof enclosures. |
Use Scenario: Interfacing legacy 12-bit DACs with modern FPGA-based control logic requiring precise analog signal handoff. IC Role / Device Role / Timing Role: Bidirectional demultiplexer enabling controlled analog output distribution from a single DAC source. Use Value: Maintains full fault protection and break-before-make timing even when operated in reverse (OUT → INx), unlike first-gen alternatives. |
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; 400Ω RDS(ON); no power-off isolation | Suitable only in fully powered, low-risk environments with external overvoltage protection | Choose ADG508A only when cost is primary constraint and fault exposure is eliminated by system design. |
| MAX358CPE+ | 8-channel like MAX378CPE+, but lower fault rating (±40V with supplies off); same package and pinout | Acceptable for less demanding industrial settings where ±75V transients are not expected | MAX358CPE+ offers drop-in replacement with reduced fault margin - verify transient immunity requirements before substitution. |
Compared with ADG508A and MAX358CPE+, the MAX378CPE+ uniquely delivers ±75V fault tolerance with zero power applied, making it the only option for safety-critical DAQ systems where sensor power persists after system shutdown.
Availability
MAX378CPE+ 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.
Supply support for MAX378CPE+ 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 MAX378CPE+ belongs to Maxim's fault-protected analog switch family, engineered specifically for signal integrity preservation in harsh environments where sensor overvoltage, power loss, and ESD events are routine operational conditions.
FAQ
What is the maximum continuous input voltage the MAX378CPE+ can withstand with its power supplies turned off?
The MAX378CPE+ can withstand ±75V continuous input voltage with V+ and V- supplies disconnected. Under this condition, all channels turn OFF and input leakage remains below 100nA, protecting both upstream sensors and downstream circuitry. This specification is explicitly guaranteed in the Absolute Maximum Ratings table and confirmed in Figures 4 and 5 of the datasheet.
Does the MAX378CPE+ support single-supply operation, and what are the constraints?
Yes, the MAX378CPE+ supports single-supply operation from +9V to +22V. In this mode, V- must be connected to GND, and the analog output swing is limited to approximately +3.5V to –2V. Digital thresholds remain centered near 1.6V, preserving TTL/CMOS compatibility. The datasheet confirms this configuration in the "Operation with Supply Voltage Other than ±15V" section.
How does the MAX378CPE+ ensure break-before-make switching, and is it guaranteed across temperature?
The MAX378CPE+ guarantees break-before-make operation with a 25–200ns delay across the full operating temperature range (0°C to +70°C for the C-grade). This is achieved via internal timing control of the series N-P-N FET gates and is verified in Figure 2 (tOPEN). No external timing components are required, and the behavior holds under all supply voltages from ±4.5V to ±18V.
Can the MAX378CPE+ be used as a demultiplexer, and does fault protection remain active?
Yes, the MAX378CPE+ functions as a demultiplexer when the analog signal is applied to the OUT pin and IN1–IN8 serve as outputs. Fault protection remains fully active in this mode - including power-off isolation and ±75V input tolerance - unlike earlier-generation fault-protected muxes. This capability is documented in the "Operation as a Demultiplexer" section of the datasheet.
What is the typical ON-resistance matching between channels of the MAX378CPE+, and how does it affect measurement accuracy?
Typical RDS(ON) matching is 2% across channels at +10V analog input and ±15V supplies, degrading to 3% at –10V. This tight matching minimizes gain error when routing multiple sensors through the same amplifier path. For example, in a thermocouple DAQ system, mismatch-induced error contributes ≤18µV total, well below the 40µV/°C signal level - eliminating need for per-channel calibration.
MAX378CPE+ 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:
- Through Hole
- Supplier Device Package:
- 16-PDIP
MAX378CPE+ FAQ
1.How can I place an order for MAX378CPE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX378CPE+ 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 MAX378CPE+ reliable?
The price and inventory of MAX378CPE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX378CPE+ is usually 5 days.
3.What payment methods are accepted for MAX378CPE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX378CPE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX378CPE+?
MAX378CPE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX378CPE+ 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 MAX378CPE+?
For technical support, including MAX378CPE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX378CPE+ requirements.
6.How does Aetrix verify that MAX378CPE+ is sourced from the original manufacturer or authorized distributors?
All MAX378CPE+ 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 MAX378CPE+ meets industry standards.
7.What is the process for return or replacement of MAX378CPE+?
All MAX378CPE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX378CPE+, 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 MAX378CPE+ part is unused and in its original packaging.
Return procedure for MAX378CPE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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