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Analog Devices Inc./Maxim Integrated MAX366CPA
- Part No.:
- MAX366CPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Mixed Technology
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX366CPA.pdf
- Description:
- TVS DEVICE MIXED 40V 8-PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,495
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Product details
Overview
MAX366CPA from Maxim Integrated is a triple-channel, two-terminal analog signal-line protector IC designed for series insertion in sensitive analog signal paths. It provides ±40V overvoltage protection, maintains <100Ω on-resistance with power applied, and exhibits <1nA leakage at +25°C-enabling robust protection of op-amp inputs, ADC/DAC interfaces, and voltage references in process control and data-acquisition systems.
For engineers reviewing the MAX366CPA datasheet, MAX366CPA pinout, MAX366CPA application, or MAX366CPA equivalent, this page delivers verified technical context, exact pin roles, real-world fault-clamping behavior, and validated alternative options for industrial signal integrity design.
Technical Context
The MAX366CPA integrates three independent, symmetrical MOSFET-based protector cells, each composed of two N-channel and one P-channel enhancement-mode FETs. Its operation relies on gate-threshold–driven conduction: Q1/Q3 turn on when source is ≥1.3V below V+, Q2 turns on when source is ≥2V above V−-establishing low-impedance signal paths only within safe voltage margins.
During fault conditions-defined as any signal voltage within ~1.5V of either supply rail-the device transitions to high impedance, clamping output to ~1.3V below V+ or ~2.0V above V− without polarity reversal or glitching. Fault current flows exclusively between IN/OUT pins; no current passes through V+/V− under fault, and leakage remains sub-nanoampere across all states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Number of Protectors | Three independent, interchangeable signal paths |
| Overvoltage Protection | ±40V maximum fault voltage (with or without power applied) |
| Analog Signal Range | ±2.25V to ±18V (bipolar) or 4.5V to 36V (unipolar) supply-compatible |
| On-Resistance (RIN-OUT) | ≤100Ω max at ±10V supplies-minimizes signal attenuation in high-Z circuits |
| Signal-Path Leakage | <1nA at +25°C (no fault), <10nA during fault-preserves precision sensor/amp bias |
| Fault Knee Voltage | ~1.3V below V+ or ~2.0V above V−-defines precise clamping threshold per rail |
| Supply Voltage Rating | 44V maximum V+ to V− differential-supports wide industrial supply ranges |
Pinout & Package
MAX366CPA is housed in an 8-pin plastic DIP package (0.300″ width), with lead finish Pb-free per JEDEC J-STD-020, RoHS-compliant, operating from 0°C to +70°C.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | Signal Input/Output Terminals (IN1/OUT1, IN2/OUT2, IN3/OUT3) | Symmetrical, bidirectional terminals-interchangeable per channel; no fixed input/output direction |
| 4 | Positive Supply Voltage (V+) | Bias source for N-channel FET gates; sets upper clamping rail and enables conduction |
| 5, 6, 7 | Signal Input/Output Terminals (OUT1/IN1, OUT2/IN2, OUT3/IN3) | Mirror Pins 1–3; identical function and electrical behavior-full terminal symmetry |
| 8 | Negative Supply Voltage (V−) | Bias source for P-channel FET gate; sets lower clamping rail and enables conduction |
Key Features
| Feature | Design Value |
|---|---|
| Automatic fault response | No control lines, programming, or external circuitry required-protection activates inherently with supply and signal conditions |
| Power-off open-circuit isolation | Virtually infinite resistance (≥1000MΩ) between IN/OUT when V+=V−=0V-prevents backfeeding and cross-talk |
| Sub-nanoampere leakage | <1nA path leakage at +25°C ensures minimal loading on high-impedance sources like pH sensors or piezoelectric transducers |
| Fault-current limiting without shunt dissipation | Current flows only between signal terminals-not through supplies-reducing thermal stress and PCB layout complexity |
| Glitch-free transition | No polarity reversal or output bounce during fault entry/exit-critical for stable feedback loops and precision measurement |
Applications
| Process Control Systems | Data-Acquisition Systems |
|---|---|
Use Scenario: Analog sensor signals (e.g., 4–20mA loop receivers, RTD bridges) routed from field I/O modules to central PLCs exposed to ESD, wiring faults, or hot-swap transients. IC Role / Device Role / Timing Role: Series-connected signal-line protector placed directly at PLC analog input stage to clamp overvoltages before reaching precision op-amps or sigma-delta ADCs. Use Value: Prevents latch-up and permanent damage to downstream converters while maintaining ≤100Ω path resistance-ensuring <0.1% gain error in 12-bit+ systems. |
Use Scenario: Multi-channel benchtop DAQ units connecting thermocouples, strain gauges, or LVDTs to high-Z instrumentation amplifiers under lab or factory test conditions. IC Role / Device Role / Timing Role: Per-channel protection element inserted between sensor interface and amplifier input, leveraging symmetrical IN/OUT terminals for flexible routing. Use Value: Enables safe hot-insertion of sensor cards and eliminates need for external diode clamps-reducing board area by >30% and eliminating leakage-induced offset drift. |
| Redundant/Backup Systems | Sensitive Instruments |
Use Scenario: Dual-redundant controller architectures where primary and backup signal paths must remain electrically isolated until failover, yet both are exposed to shared field wiring faults. IC Role / Device Role / Timing Role: Isolation guard on each signal line, exploiting power-off open-circuit behavior to prevent fault propagation between active and standby channels. Use Value: Guarantees <1000MΩ inter-channel isolation when one controller is powered down-eliminating false triggering and enabling true cold-spare operation. |
Use Scenario: Portable medical devices (e.g., ECG front-ends, EEG amplifiers) interfacing biopotential electrodes subject to defibrillation pulses or electrostatic discharge. IC Role / Device Role / Timing Role: First-stage protection before ultra-low-noise, FET-input instrumentation amps-leveraging <1nA leakage to avoid degrading pA-level input bias requirements. Use Value: Withstands ±40V transient events without degradation, preserving amplifier CMRR and input impedance >10GΩ across full bandwidth. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog signal-line protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX366CSA | Same electrical specs; SO-8 package (5.0×6.2mm) vs. DIP-8 (9.9×7.9mm); rated for same 0°C to +70°C range | Preferred for space-constrained PCBs requiring surface-mount assembly and automated reflow | Select MAX366CSA when board real estate or manufacturing process favors SOIC packaging. |
| MAX367CPN | Eight-channel version in 18-pin plastic DIP; shares identical per-channel architecture, leakage, and clamping behavior | Used where higher channel density is needed-e.g., 16-channel DAQ modules requiring compact per-channel protection | Choose MAX367CPN when protecting >3 signals per package reduces BOM count and improves layout symmetry. |
Compared with MAX366CSA, the MAX366CPA offers through-hole mounting stability and easier prototyping; compared with MAX367CPN, it delivers lower parasitic capacitance per channel and simplified thermal management in low-density layouts.
Availability
MAX366CPA is available at Aetrix Electronics and suitable for process control systems, data-acquisition equipment, and sensitive instrumentation requiring stable component supply with guaranteed long-term sourcing.
Supply support for MAX366CPA 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, communications, and computing applications.
The MAX366/MAX367 family was engineered specifically for fault-tolerant analog signal-path protection-addressing latch-up prevention, hot-swap resilience, and precision system survivability in harsh electrical environments.
FAQ
What is the maximum continuous fault voltage the MAX366CPA can withstand?
The MAX366CPA withstands up to ±40V fault voltage relative to the opposite supply rail-e.g., +35V with ±5V supplies or ±25V with ±15V supplies. When powered off (V+=V−=0V), it sustains ±40V across IN/OUT with zero fault current flow, confirmed in Absolute Maximum Ratings and Typical Operating Characteristics.
Does the MAX366CPA require external control signals or configuration?
No. The MAX366CPA operates autonomously: conduction state depends solely on V+, V−, and signal voltage relationships. There are no enable pins, programming interfaces, or external components needed-its protection logic is embedded in the FET array's gate-threshold architecture.
Can the input and output terminals of the MAX366CPA be swapped in a circuit?
Yes. All six signal terminals (Pins 1–3 and 5–7) are fully symmetrical and interchangeable per channel. The datasheet explicitly states "inputs and outputs are names for convenience only" and confirms bidirectional behavior in Normal Operation and Pin Description sections.
What is the typical on-resistance of the MAX366CPA and how does it affect signal accuracy?
The MAX366CPA has ≤100Ω typical on-resistance at ±10V supplies. In a 10kΩ load circuit, this introduces <1% gain error; in high-Z applications (>1MΩ), the effect is negligible. Resistance varies with supply and signal voltage-see Figure MAX366/7-04 for exact curves.
How does the MAX366CPA behave during power-up and power-down sequences?
During power ramp-up, the MAX366CPA remains in high-impedance fault mode until V+ and V− exceed the signal voltage by sufficient margin (~3.5V total). Output follows input only after exit from fault condition-enabling controlled signal enable timing, as demonstrated in Figure 4 (Turn-On Delay).
MAX366CPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Voltage - Clamping:
- ±40V
- Technology:
- Mixed Technology
- Number of Circuits:
- 3
- Applications:
- General Purpose
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX366CPA FAQ
1.How can I place an order for MAX366CPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX366CPA 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 MAX366CPA reliable?
The price and inventory of MAX366CPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX366CPA is usually 5 days.
3.What payment methods are accepted for MAX366CPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX366CPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX366CPA?
MAX366CPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX366CPA 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 MAX366CPA?
For technical support, including MAX366CPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX366CPA requirements.
6.How does Aetrix verify that MAX366CPA is sourced from the original manufacturer or authorized distributors?
All MAX366CPA 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 MAX366CPA meets industry standards.
7.What is the process for return or replacement of MAX366CPA?
All MAX366CPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX366CPA, 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 MAX366CPA part is unused and in its original packaging.
Return procedure for MAX366CPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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