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Analog Devices Inc./Maxim Integrated MAX379CPE+
- Part No.:
- MAX379CPE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX379CPE+.pdf
- Description:
- IC SWITCH SP4T X 2 3.5KOHM 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,822
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Product details
Overview
MAX379CPE+ 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, break-before-make timing, and TTL/CMOS-compatible digital inputs - used in avionics test equipment for routing high-voltage sensor signals while maintaining isolation during power-off conditions.
For engineers reviewing the MAX379CPE+ datasheet, MAX379CPE+ pinout, MAX379CPE+ application, or MAX379CPE+ equivalent, this page delivers verified specifications, real-world fault-protection behavior, differential channel routing capability, leakage performance under ±75V off-supply conditions, and direct alternatives for industrial signal acquisition systems requiring robust overvoltage resilience.
Technical Context
The MAX379CPE+ implements a three-FET series structure per channel (N-P-N) that actively blocks fault currents by turning off at least one transistor under overvoltage, limiting input leakage to <100nA across ±75V with supplies off and <20nA at ±60V with ±15V applied. Its digital interface uses fixed 0.8V/2.4V logic thresholds independent of supply voltage, ensuring reliable enable and address decoding even at ±5V operation.
As a differential mux, it provides two independent output paths (OUTA/OUTB) with matched ON-resistance (±2% typical), differential OFF-isolation >66dB at 1MHz, and guaranteed break-before-make delay (25–200ns) to prevent input-to-input shorts. All channels disable automatically when V+/V− are unpowered, eliminating backdrive risk from live sensors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Configuration | 4-channel differential (2-of-8) analog multiplexer - selects one of four differential input pairs to two dedicated outputs (OUTA/OUTB). |
| Fault Protection | ±75V input tolerance with supplies off; ±60V continuous with ±15V supplies - prevents damage to sensors and downstream circuitry during power loss or transients. |
| ON Resistance | 2.0kΩ typical at +25°C, ±15V supplies - enables low-gain error in precision data acquisition (e.g., ≤18µV error with MAX420 op amp). |
| Leakage Current | <100nA input leakage with supplies off; <20nA output leakage under ±60V overvoltage - preserves signal integrity and avoids loading high-Z sources. |
| Supply Range | ±4.5V to ±18V - supports single +9V to +22V operation (V− tied to GND) and asymmetric rails like +15V/−5V without logic threshold shift. |
| Switching Speed | 600ns channel-to-channel access time; 25–200ns break-before-make delay - ensures no simultaneous conduction between differential inputs. |
| Digital Interface | TTL/CMOS-compatible inputs (0.8V/2.4V thresholds); <1µA input current - eliminates need for pull-ups and simplifies controller interfacing. |
Pinout & Package
MAX379CPE+ is housed in a 16-pin plastic DIP package (0.300" width), with through-hole mounting and industry-standard footprint. Pin 1 is located at the top-left corner adjacent to the notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN1A) | Differential input A, channel 1 | Positive leg of first differential pair - routed to OUTA when A1=0, A0=0, EN=1. |
| 2 (IN2A) | Differential input A, channel 2 | Positive leg of second differential pair - connects to OUTA only when selected; isolated otherwise. |
| 3 (IN3A) | Differential input A, channel 3 | Positive leg of third differential pair - maintains <5pC differential charge injection for low crosstalk. |
| 4 (IN4A) | Differential input A, channel 4 | Positive leg of fourth differential pair - shares same ON-resistance match as IN1A–IN3A. |
| 5 (OUTA) | Differential output A | Common output node for all INxA channels - driven only when corresponding A1/A0/EN state is active. |
| 6 (OUTB) | Differential output B | Complementary output node for all INxB channels - enables true differential signal routing without external inversion. |
| 7 (IN4B) | Differential input B, channel 4 | Negative leg of fourth differential pair - matches IN4A timing and leakage for common-mode rejection. |
| 8 (IN3B) | Differential input B, channel 3 | Negative leg of third differential pair - paired with IN3A for balanced signal handling. |
| 9 (IN2B) | Differential input B, channel 2 | Negative leg of second differential pair - guarantees matched RDS(ON) and settling time vs. IN2A. |
| 10 (IN1B) | Differential input B, channel 1 | Negative leg of first differential pair - forms complete differential path with IN1A to OUTA/OUTB. |
| 11 (EN) | Enable input | Active-high digital control - disables all channels when low; threshold fixed at 0.8V/2.4V regardless of supply voltage. |
| 12 (A0) | Address bit 0 | LSB of 2-bit channel select - toggling A0 changes selected channel between odd/even pairs (e.g., 0→1 switches IN1/IN2 to IN3/IN4). |
| 13 (A1) | Address bit 1 | MSB of 2-bit channel select - combined with A0, selects one of four differential channels (00–11). |
| 14 (V−) | Negative supply rail | Connects to −4.5V to −18V - defines lower analog swing limit and powers internal P-channel FETs in protection structure. |
| 15 (V+) | Positive supply rail | Connects to +4.5V to +18V - powers N-channel FETs and sets upper analog output limit (~V+ − 1.5V). |
| 16 (GND) | Analog/digital reference | Signal return path for logic inputs and substrate reference - must be low-impedance to maintain >100dB digital-analog isolation. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-FET fault protection | Series N-P-N structure limits fault current to nanoampere levels under ±75V off-supply and ±60V on-supply conditions - protects sensors and downstream ADCs. |
| Automatic power-off disable | All channels turn OFF when V+/V− are unpowered - eliminates backfeed and ensures <100nA input leakage without external control logic. |
| Differential channel matching | Typical RDS(ON) match ≤3% across all channels at ±10V input - enables accurate ratiometric measurements in bridge sensor interfaces. |
| Break-before-make switching | Guaranteed 25–200ns inter-channel delay - prevents momentary shorting between differential inputs during address changes. |
| Wide supply flexibility | Operates from ±4.5V to ±18V or single +9V to +22V (V− = GND) - supports legacy ±15V systems and modern low-voltage industrial controllers. |
| Low charge injection | ≤5pC differential charge injection (MAX379) - minimizes voltage glitch on high-Z loads like sample-and-hold capacitors. |
Applications
| Avionics Test Equipment | Industrial Data Acquisition |
|---|---|
Use Scenario: Routing multiple high-voltage aircraft sensor outputs (e.g., engine thermocouples, pressure transducers) to a shared test instrumentation system under variable power conditions. IC Role / Device Role / Timing Role: Differential analog multiplexer providing fault-isolated signal selection with automatic shutdown during aircraft power cycling. Use Value: Prevents ±75V sensor backfeed damage during ground-test power sequencing and eliminates need for external protection diodes or relays. |
Use Scenario: Multiplexing 4–8 differential RTD or strain gauge bridges into a single precision ADC in PLC analog input modules. IC Role / Device Role / Timing Role: High-voltage-tolerant differential mux enabling ratiometric measurement without gain-switching amplifiers. Use Value: Delivers <2nA ON-channel leakage and ≤3% RDS(ON) match - reduces measurement error to <0.01% FS in 24-bit DAQ systems. |
| Process Control Signal Routing | High-Voltage Sensor Interface |
Use Scenario: Switching between redundant 4–20mA current-loop transmitters in hazardous-area process controllers where loop power may remain active during maintenance. IC Role / Device Role / Timing Role: Fault-protected differential switch isolating live current loops from powered-down controller circuitry. Use Value: Withstands ±60V continuous input with supplies on - avoids latch-up or destruction when loop power persists during firmware updates. |
Use Scenario: Interfacing ±40V piezoelectric accelerometers or ion-selective electrodes to low-voltage microcontrollers in environmental monitoring nodes. IC Role / Device Role / Timing Role: Level-shifting, fault-isolated front-end mux allowing safe connection of high-voltage sensors to 3.3V/5V signal chains. Use Value: Enables direct sensor connection without external attenuators or isolation amplifiers - cuts BOM cost by ≥3 components per channel. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential analog multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADG509FBRZ | Single-supply only (+5V to +36V); no negative rail support; ±40V fault rating with supplies on; no off-supply protection beyond ±20V. | Suitable for unipolar industrial sensors but cannot replace MAX379CPE+ in bipolar ±15V systems or avionics with live-negative rails. | Select ADG509FBRZ only when operating exclusively from positive supplies and fault exposure is limited to ±40V with power applied. |
| TMUX1309PWR | Single-ended 4:1 mux (not differential); ±25V fault rating; no off-supply blocking; 4.5Ω RDS(ON); requires external differential receiver. | Applicable for low-voltage SE signal routing only - lacks inherent differential path, off-supply safety, and high-voltage resilience needed for MAX379CPE+ use cases. | Choose TMUX1309PWR only for cost-sensitive, low-voltage (<±10V), non-fault-critical SE applications where differential signaling is handled externally. |
Compared with ADG509FBRZ and TMUX1309PWR, the MAX379CPE+ uniquely delivers integrated differential routing, ±75V off-supply protection, and bipolar rail operation - making it irreplaceable in avionics test and industrial DAQ systems requiring guaranteed isolation during power transitions.
Availability
MAX379CPE+ is available at Aetrix Electronics and suitable for avionics test equipment, industrial data acquisition systems, process control signal routing, and high-voltage sensor interface applications requiring stable component supply and long-term obsolescence management.
Supply support for MAX379CPE+ 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 - emphasizing fault tolerance, precision, and ruggedized operation.
The MAX379CPE+ belongs to Maxim's fault-protected analog multiplexer product line, engineered specifically for signal routing in environments where sensors remain powered during system maintenance or brownout events - prioritizing fail-safe isolation over speed or integration density.
FAQ
What is the maximum continuous input voltage the MAX379CPE+ can withstand with its power supplies turned off?
The MAX379CPE+ sustains ±75V continuous input voltage with V+ and V− unpowered, drawing less than 100nA leakage current per input. This off-supply protection prevents damage to upstream sensors and downstream circuitry during unexpected power loss - a key differentiator versus standard multiplexers that conduct milliamp-level fault currents when unpowered.
Does the MAX379CPE+ support differential signal routing without external components?
Yes, the MAX379CPE+ natively supports differential routing via dedicated INxA/INxB inputs and separate OUTA/OUTB outputs. Each of the four channels routes a full differential pair, eliminating the need for external inverters or dual single-ended muxes - preserving phase matching, common-mode rejection, and timing alignment critical in precision measurement systems.
How does the MAX379CPE+ behave during power supply sequencing, such as when V− is applied before V+?
The MAX379CPE+ remains fully protected during asymmetric power sequencing: all channels stay OFF until both V+ and V− reach valid operating thresholds (±4.5V). Its triple-FET structure ensures no conduction path forms if only one rail is present, preventing latch-up or uncontrolled current flow - a requirement verified in avionics power-up validation protocols.
Can the MAX379CPE+ operate from a single +12V supply, and what are the analog output limitations?
Yes, the MAX379CPE+ operates from a single +12V supply with V− tied to GND. In this configuration, the analog output swing is limited to approximately +10.5V (V+ − 1.5V) and 0V - sufficient for interfacing with 10-bit+ SAR ADCs but not for true bipolar signal handling. Digital inputs retain TTL/CMOS compatibility with 0.8V/2.4V thresholds.
What is the guaranteed break-before-make delay for the MAX379CPE+, and why is it critical in differential applications?
The MAX379CPE+ guarantees 25–200ns break-before-make delay between channel selections. In differential routing, this prevents momentary shorting of INxA to INxB of another channel - which could cause destructive current flow, measurement corruption, or latch-up in bridge-based sensors. This timing is factory-tested and specified across temperature and supply ranges.
MAX379CPE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Switch Circuit:
- SP4T
- Multiplexer/Demultiplexer Circuit:
- 4:1
- Number of Circuits:
- 2
- 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, 12pF
- 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
MAX379CPE+ FAQ
1.How can I place an order for MAX379CPE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX379CPE+ 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+ reliable?
The price and inventory of MAX379CPE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX379CPE+ is usually 5 days.
3.What payment methods are accepted for MAX379CPE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX379CPE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX379CPE+?
MAX379CPE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX379CPE+ 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+?
For technical support, including MAX379CPE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX379CPE+ requirements.
6.How does Aetrix verify that MAX379CPE+ is sourced from the original manufacturer or authorized distributors?
All MAX379CPE+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX379CPE+?
All MAX379CPE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX379CPE+, 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+ part is unused and in its original packaging.
Return procedure for MAX379CPE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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