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Analog Devices Inc./Maxim Integrated MAX379CPE+G035
- Part No.:
- MAX379CPE+G035
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- -
- Datasheet:
-
MAX379CPE+G035.pdf
- Description:
- INTEGRATED CIRCUIT
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Product details
Overview
MAX379CPE+G035 from Maxim Integrated is a 4-channel differential (2-of-8) fault-protected analog multiplexer with series N-channel/P-channel/N-channel switch architecture, ±60V continuous input tolerance under ±15V supplies, <2mW power dissipation, and guaranteed break-before-make switching. It serves as a high-reliability signal routing interface in industrial data acquisition front ends where sensor overvoltage and power-loss scenarios are common.
For engineers reviewing the MAX379CPE+G035 datasheet, MAX379CPE+G035 pinout, MAX379CPE+G035 application, or MAX379CPE+G035 equivalent, this page delivers verified specifications, validated pin functions, confirmed fault-protection behavior under supply-off conditions, and real-world design implications for avionics test equipment and process control systems.
Technical Context
The MAX379CPE+G035 implements a three-FET series protection structure that actively blocks fault currents by turning off either the N-channel or P-channel device depending on input polarity - limiting leakage to <100nA at ±60V with supplies on, and <20µA transient (decaying to <50nA) during overvoltage events. Its digital interface operates with TTL/CMOS-compatible thresholds (0.8V/2.4V) independent of supply voltage, enabling direct interfacing with microcontrollers across ±4.5V to ±18V operation.
Unlike first-generation fault-protected muxes, the MAX379CPE+G035 maintains full channel isolation with power supplies off (±75V fault tolerance), prevents output overvoltage propagation, and guarantees sub-microamp input current under all fault conditions - critical for protecting thermocouple sensors and 4–20mA transmitters in unpowered system states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Configuration | 4-channel differential (2-of-8) analog multiplexer - routes two independent analog signals simultaneously (e.g., IN1A/IN1B → OUTA/OUTB) |
| Fault Tolerance (Supplies On) | ±60V continuous analog input - withstands industrial transients without latchup or damage when powered from ±15V |
| Fault Tolerance (Supplies Off) | ±75V analog input - channels fully disable; draws only nanoampere-level leakage, protecting sensors during power-down |
| ON Resistance | 2.0kΩ typical at +25°C (±15V supplies) - introduces minimal gain error in precision signal chains with low-source-impedance sensors |
| Leakage Current (OFF) | ±50nA max at ±10V, ±60V supplies - ensures <1µV error in 20kΩ signal paths, critical for µV-level thermocouple measurements |
| Supply Range | ±4.5V to ±18V - supports single-supply operation (e.g., +9V to +22V with V− tied to GND) while maintaining TTL/CMOS logic compatibility |
| Break-Before-Make Delay | 25ns to 200ns - prevents input-to-input shorts during channel switching, essential for avoiding cross-talk in multi-sensor systems |
Pinout & Package
MAX379CPE+G035 is housed in a 16-pin plastic DIP package (0.300" wide), with lead finish specified as Pb-free (RoHS-compliant) per +G035 suffix. Pin 1 is located at the top-left corner adjacent to the notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A1) | Address Input A1 | Selects one of four differential channel pairs (00=CH1, 01=CH2, 10=CH3, 11=CH4) with EN active high |
| 2 (GND) | Analog/Digital Ground | Common reference for analog signals and digital logic; must be low-impedance to minimize crosstalk |
| 3 (V+) | Positive Supply Rail | Accepts +4.5V to +18V; powers internal logic and analog switches; substrate may float or tie to V+ |
| 4 (IN1B) | Differential Input B, Channel 1 | Negative leg of first differential pair; routed to OUTB when A1/A0=00 and EN=high |
| 5 (IN1A) | Differential Input A, Channel 1 | Positive leg of first differential pair; routed to OUTA when A1/A0=00 and EN=high |
| 6 (V−) | Negative Supply Rail | Accepts −4.5V to −18V; completes analog switch biasing; required for bipolar signal handling |
| 7 (EN) | Enable Input | Active-high digital control; disables all channels when low, forcing OFF-state isolation and zero supply current draw |
| 8 (A0) | Address Input A0 | LSB of 2-bit address; combined with A1 determines selected differential channel pair |
| 9 (IN2B) | Differential Input B, Channel 2 | Negative leg of second differential pair; routed to OUTB when A1/A0=01 and EN=high |
| 10 (IN2A) | Differential Input A, Channel 2 | Positive leg of second differential pair; routed to OUTA when A1/A0=01 and EN=high |
| 11 (IN3B) | Differential Input B, Channel 3 | Negative leg of third differential pair; routed to OUTB when A1/A0=10 and EN=high |
| 12 (IN3A) | Differential Input A, Channel 3 | Positive leg of third differential pair; routed to OUTA when A1/A0=10 and EN=high |
| 13 (IN4B) | Differential Input B, Channel 4 | Negative leg of fourth differential pair; routed to OUTB when A1/A0=11 and EN=high |
| 14 (OUTB) | Differential Output B | Common output node for negative legs of selected channel; requires matched trace length to OUTA |
| 15 (OUTA) | Differential Output A | Common output node for positive legs of selected channel; used with OUTB for noise-rejecting signal routing |
| 16 (IN4A) | Differential Input A, Channel 4 | Positive leg of fourth differential pair; routed to OUTA when A1/A0=11 and EN=high |
Key Features
| Feature | Design Value |
|---|---|
| Series N/P/N fault protection | Blocks ±60V faults with <100nA leakage under power, and ±75V with supplies off - eliminates need for external clamping diodes |
| Power-off channel disable | All switches turn OFF automatically when V+/V− removed - prevents back-driving and protects downstream ADCs/S/Hs |
| TTL/CMOS-compatible inputs | 0.8V/2.4V thresholds with <1µA input current - interfaces directly with FPGA GPIO or MCU pins without pull-ups |
| Differential channel architecture | Simultaneous routing of complementary signal pairs (e.g., INxA/INxB → OUTA/OUTB) - preserves common-mode rejection in instrumentation amps |
| Break-before-make switching | Guaranteed 25–200ns inter-channel isolation - prevents momentary shorting between sensor inputs during reconfiguration |
| Latchup-proof CMOS process | Withstands >1000V HBM ESD without functional disruption - suitable for field-deployed test equipment handling ungrounded sensors |
Applications
| Industrial Data Acquisition | Avionics Test Equipment |
|---|---|
Use Scenario: Multiplexing 4–20mA current-loop transmitters and RTD/thermocouple sensors in PLC-based monitoring systems with intermittent power cycles. IC Role / Device Role / Timing Role: Fault-protected analog switch enabling safe signal routing during brown-out events and hot-swap maintenance. Use Value: Prevents >10mA fault current flow into thermocouples during power loss, eliminating sensor drift and calibration drift in Class I Div 2 hazardous locations. |
Use Scenario: Routing differential analog test signals (e.g., LVDT outputs, synchro voltages) between flight control computers and ground test benches. IC Role / Device Role / Timing Role: High-voltage differential multiplexer ensuring signal integrity and isolation during aircraft power-up/down sequences. Use Value: Withstands ±75V transients induced by electromagnetic interference in hangar environments without requiring external TVS networks. |
| Process Control Systems | Signal Routing Between Systems |
Use Scenario: Selecting among multiple pressure, flow, and level transmitters feeding a central DCS analog input card operating at ±15V rails. IC Role / Device Role / Timing Role: Precision analog switch providing channel selection with <2.0kΩ ON resistance and <50nA OFF leakage. Use Value: Enables 16-bit ADC accuracy (<0.01% FSR error) even with 10kΩ source impedances due to ultra-low leakage and matched RDS(ON). |
Use Scenario: Interfacing legacy analog subsystems (e.g., oscilloscope front-end, spectrum analyzer IF stage) with modern digital controllers via shared analog bus. IC Role / Device Role / Timing Role: Bidirectional differential demultiplexer supporting both mux and demux modes with identical fault protection. Use Value: Eliminates need for separate protection circuitry when routing signals from high-impedance sources to low-impedance loads, reducing BOM count by 3+ components per channel. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fault-protected analog multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADG508FBRZ | 8-channel single-ended, ±40V fault rating (supplies on), no power-off protection - lacks ±75V off-state tolerance and differential channel pairing | Suitable for lower-voltage industrial I/O where sensor overvoltage risk is mitigated externally | Choose ADG508FBRZ only if single-ended topology suffices and fault exposure is limited to ±40V with power applied |
| TMUX1308PWR | 8-channel single-ended, ±25V fault rating, no power-off disable - relies on external power sequencing for safety | Targeted at cost-sensitive consumer-grade DAQ where ±25V transients are acceptable | Select TMUX1308PWR only for non-critical applications with controlled lab environments and no unpowered sensor exposure |
Compared with ADG508FBRZ and TMUX1308PWR, the MAX379CPE+G035 uniquely provides differential channel routing, ±75V fault tolerance with supplies off, and guaranteed break-before-make timing - making it the sole option for safety-critical, high-reliability multiplexing in avionics and process control where sensor protection during power loss is mandatory.
Availability
MAX379CPE+G035 is available at Aetrix Electronics and suitable for industrial data acquisition systems, avionics test equipment, and process control systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX379CPE+G035 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, with emphasis on reliability and fault resilience.
The MAX379CPE+G035 belongs to Maxim's fault-protected analog multiplexer product line, engineered specifically for signal routing in harsh environments where sensor overvoltage, power interruption, and EMI-induced transients threaten system integrity.
FAQ
What is the maximum continuous input voltage the MAX379CPE+G035 can withstand with its power supplies active?
The MAX379CPE+G035 supports ±60V continuous analog input voltage when powered from ±15V supplies. This rating is guaranteed across the full 0°C to +70°C temperature range and applies to both INxA and INxB pins. Operation beyond ±60V risks exceeding absolute maximum ratings and may cause permanent damage, even if within the ±65V absolute limit cited in some characterization graphs.
Does the MAX379CPE+G035 remain protected when its V+ and V− supplies are disconnected?
Yes - the MAX379CPE+G035 remains fully fault-protected with supplies off, tolerating ±75V on any input pin while drawing less than 20µA transient leakage (decaying to <50nA). All channels automatically disable, preventing signal coupling or back-powering. This behavior is intrinsic to its series N/P/N gate structure and does not require external circuitry.
Can the MAX379CPE+G035 be used in demultiplexer mode, and does fault protection apply?
Yes - the MAX379CPE+G035 operates bidirectionally and supports demultiplexer mode (signal applied to OUTA/OUTB, outputs taken from INxA/INxB pins) with identical fault protection, break-before-make timing, and leakage performance as in multiplexer mode. This capability is explicitly validated in the datasheet's "Operation as a Demultiplexer" section.
What is the guaranteed break-before-make delay for the MAX379CPE+G035, and why does it matter?
The MAX379CPE+G035 guarantees a break-before-make delay of 25ns minimum to 200ns maximum between channel transitions. This prevents momentary shorting of two analog inputs - a critical requirement when multiplexing sensors with different common-mode voltages (e.g., grounded vs. floating thermocouples), avoiding measurement corruption or damage to upstream signal conditioners.
How does the MAX379CPE+G035 achieve TTL/CMOS compatibility without external pull-up resistors?
The MAX379CPE+G035 uses internally biased input structures with guaranteed logic thresholds of 0.8V (low) and 2.4V (high) across temperature and supply voltage. Input leakage remains below 1µA at all logic levels, eliminating the need for external pull-ups. This allows direct connection to microcontroller GPIOs, CPLD outputs, or FPGA banks without additional components.
MAX379CPE+G035 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Switch Circuit:
- -
- Multiplexer/Demultiplexer Circuit:
- -
- Number of Circuits:
- -
- On-State Resistance (Max):
- -
- Channel-to-Channel Matching (ΔRon):
- -
- Voltage - Supply, Single (V+):
- -
- Voltage - Supply, Dual (V±):
- -
- Switch Time (Ton, Toff) (Max):
- -
- -3db Bandwidth:
- -
- Charge Injection:
- -
- Channel Capacitance (CS(off), CD(off)):
- -
- Current - Leakage (IS(off)) (Max):
- -
- Crosstalk:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX379CPE+G035 FAQ
1.How can I place an order for MAX379CPE+G035 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX379CPE+G035 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 MAX379CPE+G035 reliable?
The price and inventory of MAX379CPE+G035 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX379CPE+G035 is usually 5 days.
3.What payment methods are accepted for MAX379CPE+G035?
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4.How is shipping managed for MAX379CPE+G035?
MAX379CPE+G035 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX379CPE+G035 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 MAX379CPE+G035?
For technical support, including MAX379CPE+G035 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX379CPE+G035 requirements.
6.How does Aetrix verify that MAX379CPE+G035 is sourced from the original manufacturer or authorized distributors?
All MAX379CPE+G035 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 MAX379CPE+G035 meets industry standards.
7.What is the process for return or replacement of MAX379CPE+G035?
All MAX379CPE+G035 units undergo pre-shipment inspection (PSI). If there is an issue with MAX379CPE+G035, 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 MAX379CPE+G035 part is unused and in its original packaging.
Return procedure for MAX379CPE+G035:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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