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Analog Devices Inc./Maxim Integrated MAX366EPA+
- Part No.:
- MAX366EPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Mixed Technology
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX366EPA+.pdf
- Description:
- TVS DEVICE MIXED 40V 8-PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:7,645
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Product details
Overview
MAX366EPA+ 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-amps, ADCs, and voltage references in process control and data-acquisition systems.
For engineers reviewing the MAX366EPA+ datasheet, MAX366EPA+ pinout, MAX366EPA+ application, or MAX366EPA+ equivalent, key selection considerations include its symmetrical input/output terminals, fault knee voltage of ~1.3V below V+ or ~2.0V above V−, operation across –55°C to +125°C, and compatibility with unipolar (4.5V–36V) or bipolar (±2.25V–±18V) supplies.
Technical Context
The MAX366EPA+ integrates three independent voltage-sensitive MOSFET arrays per package, each composed of two N-channel and one P-channel enhancement-mode FETs. Its protection mechanism relies on gate-threshold–driven conduction: under normal conditions (signal within ~1.5V of rails), all FETs conduct to form a low-impedance path; during overvoltage, FETs pinch off to limit current and clamp output to fault knee voltages.
No external control lines or programming are required - operation is fully autonomous and supply-powered. The device remains an open circuit when powered off (V+ = V− = 0V), isolating signal paths up to ±40V, and exhibits no polarity reversal or glitching during fault entry/exit transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Number of Protectors | Three independent, symmetrical two-terminal protectors per IC |
| Overvoltage Protection | ±40V maximum fault voltage - protects against transients beyond supply rails, including during power-off |
| On-Resistance (RIN-OUT) | ≤100Ω max at ±10V supplies - preserves signal integrity in high-impedance circuits without significant voltage drop |
| Signal-Path Leakage | <1nA at +25°C - negligible loading on precision sensor or reference inputs |
| Supply Range | Unipolar: 4.5V to 36V; Bipolar: ±2.25V to ±18V - supports wide industrial and test equipment supply configurations |
| Fault Knee Voltage | ~1.3V below V+ or ~2.0V above V− - defines clamping level during overvoltage, ensuring downstream ICs stay within safe operating area |
| Operating Temperature | –55°C to +125°C - qualified for extended industrial, aerospace, and harsh-environment applications |
Pinout & Package
MAX366EPA+ is housed in an 8-pin plastic DIP (dual in-line package) with 0.300″ body width, lead pitch of 0.100″, and RoHS-compliant lead finish. Pin 1 is top-left corner when notch faces up; pins are numbered counterclockwise.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | Signal Input/Output Terminals (IN1/OUT1, IN2/OUT2, IN3/OUT3) | Symmetrical, interchangeable terminals - no fixed input/output direction; each pair forms one protected signal path |
| 4 | Positive Supply Voltage (V+) | Connects to most positive rail; biases N-channel FET gates; determines upper fault knee voltage |
| 5, 6, 7 | Signal Input/Output Terminals (OUT1/IN1, OUT2/IN2, OUT3/IN3) | Mirror pins 1–3; identical function and electrical behavior - enables flexible PCB routing |
| 8 | Negative Supply Voltage (V−) | Connects to most negative rail (or ground in single-supply); biases P-channel FET gate; determines lower fault knee voltage |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Overvoltage Response | No control logic or configuration needed - protection activates instantly based solely on signal-to-supply voltage differential |
| Power-Off Open-Circuit Isolation | Virtual open circuit (≥1000MΩ) with V+ = V− = 0V - prevents backfeeding and cross-talk between unpowered subsystems |
| Symmetrical Signal Path | IN/OUT pins electrically identical - eliminates directional routing constraints and simplifies layout for bidirectional signals |
| Fault-Condition Leakage Control | <10nA total leakage during overvoltage (±25V, VOUT open) - avoids false triggering in high-Z monitoring circuits |
| Bipolar & Unipolar Flexibility | Single design supports both ±15V instrumentation and +24V PLC I/O - reduces BOM count across product families |
Applications
| Process Control Interfaces | Redundant System Switchover |
|---|---|
|
Use Scenario: Analog sensor signals (e.g., 4–20mA loop outputs, thermocouple amplifiers) routed into PLC analog input modules exposed to field wiring faults and hot-swap events. IC Role / Device Role / Timing Role: Series-connected protector that limits transient energy before it reaches precision op-amp front-ends and SAR ADCs. Use Value: Prevents latch-up and permanent damage from ±35V transients during maintenance or cable miswiring while maintaining ≤100Ω signal-path resistance for <0.1% gain error. |
Use Scenario: Dual-controller architectures where active and standby units share analog status buses; fault on one side must not propagate to the other. IC Role / Device Role / Timing Role: Bidirectional isolation element that blocks fault currents between redundant channels during failover sequencing. Use Value: Enables seamless switchover by holding downstream circuitry at safe bias points (<1.5V from rails) without requiring interlock timing or software coordination. |
| ATE Signal Conditioning | Hot-Insertion Sensor Boards |
|
Use Scenario: Test head cabling connecting DUT analog I/O to instrument-grade digitizers, subject to repeated plug/unplug-induced ESD and contact bounce. IC Role / Device Role / Timing Role: First-stage analog guard protecting low-noise amplifier inputs and reference buffers from contact-induced spikes. Use Value: Sustains sub-nA leakage and flat frequency response up to 5MHz - preserves measurement accuracy without adding noise or phase shift in DC-coupled paths. |
Use Scenario: Modular sensor nodes inserted into powered backplanes carrying ±12V and +5V rails; signal lines may float or short during mating. IC Role / Device Role / Timing Role: Power-rail–synchronized switch that opens automatically during power ramp-up/down to prevent inrush or reverse-current flow. Use Value: Eliminates need for sequenced enable signals - protection engages passively as V+ and V− stabilize, enabling true hot-plug compliance without firmware overhead. |
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 |
|---|---|---|---|
| MAX366ESA+ | Same silicon, SO-8 package (5.0mm × 6.2mm), –40°C to +85°C temp range - smaller footprint but lower thermal mass and reduced high-temp reliability margin | Preferred for space-constrained industrial controllers where ambient stays below 85°C; unsuitable for under-hood or avionics use | Select MAX366ESA+ only if board area is critical and full –55°C to +125°C operation is not required. |
| MAX367EPA+ | Eight-channel version in 18-pin plastic DIP; identical per-channel specs but higher pin count and larger package - shares same protection architecture and fault behavior | Used when >3 protected channels are needed on a single board; requires additional PCB real estate and routing complexity | Choose MAX366EPA+ for cost-optimized 3-channel designs; upgrade to MAX367EPA+ only when channel density justifies added size and cost. |
Compared with MAX366ESA+, MAX366EPA+ offers extended temperature capability and superior thermal derating in DIP packaging, while MAX367EPA+ trades pin count and board area for channel scalability - neither is pin-compatible, but all share identical electrical protection behavior per channel.
Availability
MAX366EPA+ is available at Aetrix Electronics and suitable for process control interfaces, redundant system switchover, and ATE signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX366EPA+ 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 fabless 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 routing in modular systems - prioritizing zero-configuration protection, rail-to-rail fault clamping, and fail-safe open-circuit behavior during power loss.
FAQ
What is the maximum continuous fault voltage the MAX366EPA+ can withstand?
The MAX366EPA+ withstands up to ±40V fault voltage relative to the opposite supply rail - meaning with ±5V supplies, it handles ±35V transients; with ±15V supplies, ±25V; and with V+ = V− = 0V (power off), it isolates ±40V. This rating is specified in Absolute Maximum Ratings and verified across the –55°C to +125°C operating range for MAX366EPA+.
Does the MAX366EPA+ require external components to function as a protector?
No, the MAX366EPA+ operates autonomously with only V+ and V− connections - no external resistors, capacitors, or control signals are needed. Its protection logic is embedded in the MOSFET array topology and responds directly to voltage differentials between signal pins and supply rails. External components like RC networks (e.g., for turn-on delay) are optional enhancements, not functional prerequisites for basic overvoltage protection.
Can the input and output pins of the MAX366EPA+ be swapped in the PCB layout?
Yes - all six signal pins (pins 1–3 and 5–7) are electrically symmetrical and fully interchangeable per channel. The labeling "IN" and "OUT" in the datasheet is for functional convenience only; the MAX366EPA+ has no directional signal path. This allows flexible routing where signal flow direction may vary across system configurations or revisions.
How does the MAX366EPA+ behave during power-up and power-down sequences?
During power-up, the MAX366EPA+ remains in a high-impedance fault state until V+ and V− exceed the input signal voltage by ~1.5V; output then tracks input with ~100Ω resistance. During power-down, it reverts to open-circuit isolation. No glitches or polarity reversals occur - the output voltage smoothly transitions between clamped fault knee levels and normal conduction, preserving downstream circuit stability.
Is the MAX366EPA+ suitable for protecting high-frequency analog signals?
The MAX366EPA+ maintains flat frequency response up to ~5MHz in 50Ω systems, with <0.5dB loss - sufficient for many data-acquisition and sensor interface applications. Above 5MHz, impedance variation causes minor peaks highly dependent on PCB layout. For RF or high-speed digital signals (>10MHz), dedicated ESD arrays or TVS diodes are recommended instead, as the MAX366EPA+'s voltage-dependent resistance is not optimized for broadband impedance control.
MAX366EPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Voltage - Clamping:
- ±40V
- Technology:
- Mixed Technology
- Number of Circuits:
- 3
- Applications:
- General Purpose
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX366EPA+ FAQ
1.How can I place an order for MAX366EPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX366EPA+ 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 MAX366EPA+ reliable?
The price and inventory of MAX366EPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX366EPA+ is usually 5 days.
3.What payment methods are accepted for MAX366EPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX366EPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX366EPA+?
MAX366EPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX366EPA+ 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 MAX366EPA+?
For technical support, including MAX366EPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX366EPA+ requirements.
6.How does Aetrix verify that MAX366EPA+ is sourced from the original manufacturer or authorized distributors?
All MAX366EPA+ 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 MAX366EPA+ meets industry standards.
7.What is the process for return or replacement of MAX366EPA+?
All MAX366EPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX366EPA+, 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 MAX366EPA+ part is unused and in its original packaging.
Return procedure for MAX366EPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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