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Analog Devices Inc./Maxim Integrated MAX366ESA+T
- Part No.:
- MAX366ESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Mixed Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX366ESA+T.pdf
- Description:
- TVS DEVICE MIXED 40V 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,031
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Product details
Overview
MAX366ESA+T 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 industrial data-acquisition systems.
For engineers reviewing the MAX366ESA+T datasheet, MAX366ESA+T pinout, MAX366ESA+T application, or MAX366ESA+T equivalent, this device is selected for fault-tolerant analog interfaces requiring automatic, zero-control, bidirectional protection against ±35V transients during hot-insertion, power sequencing, or brownout events-without degrading high-impedance signal integrity.
Technical Context
The MAX366ESA+T integrates three independent, symmetrical MOSFET-based protector cells per package, 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-RON only within safe signal bounds.
During fault conditions-defined as input/output voltage within ~1.5V of either supply rail-the device transitions to high-impedance mode, clamping output to ~1.3V below V+ or ~2.0V above V− while limiting fault current to ≤30mA. No current flows through supply pins during faults; all fault current passes directly between IN/OUT terminals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Number of Protectors | Three independent, interchangeable two-terminal channels |
| 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-preserves signal fidelity in ≤10kΩ load circuits |
| Signal-Path Leakage | <1nA max at +25°C-enables use with high-Z op-amp inputs without offset drift |
| Fault Knee Voltage | ~1.3V below V+ or ~2.0V above V−-defines precise clamping threshold during overvoltage |
| Supply Current | <1µA typical-allows direct driving of V+/V− pins from CMOS logic for switched-protection control |
Pinout & Package
MAX366ESA+T is housed in an 8-pin SO (Small Outline) package, 150-mil width, with gull-wing leads and JEDEC MS-012AC compliance. Pin 1 is OUT1, Pin 2 is OUT2, Pin 3 is OUT3, Pin 4 is V+, Pin 5 is IN3, Pin 6 is IN2, Pin 7 is IN1, Pin 8 is V−. All signal pins are bidirectional and functionally identical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT1, OUT2, OUT3 | Protected signal output terminal | Interchangeable with corresponding IN pins; carries clamped analog signal to downstream circuitry |
| IN1, IN2, IN3 | Protected signal input terminal | Interchangeable with corresponding OUT pins; accepts potentially hazardous external signals |
| V+ | Positive supply rail connection | Bias source for internal N-channel FET gates; defines upper fault knee and operating range |
| V− | Negative supply rail connection | Bias source for internal P-channel FET gate; defines lower fault knee and enables bipolar operation |
Key Features
| Feature | Design Value |
|---|---|
| Automatic fault response | No control lines, programming, or external bias required-protection activates inherently with supply and signal conditions |
| Power-off open-circuit isolation | Virtual open circuit (≥1000MΩ) with V+=V−=0V-prevents backfeeding and cross-talk during system shutdown |
| Symmetrical IN/OUT terminals | Eliminates routing constraints; supports bidirectional signal flow and flexible PCB layout |
| Low-leakage fault behavior | <1nA leakage during overvoltage-avoids loading high-Z nodes like precision reference inputs or FET amplifier gates |
| Zero-glitch transition | No polarity reversal or output bounce entering/exiting fault-ensures clean recovery in critical measurement paths |
Applications
| Process Control I/O Protection | Hot-Insertion Sensor Interfaces |
|---|---|
Use Scenario: Analog sensor signals (e.g., 4–20mA loop receivers, RTD bridges) routed into PLC backplanes subject to field wiring faults and module hot-swap transients. IC Role / Device Role / Timing Role: Series-connected signal-line protector placed between connector and ADC front-end, providing ±40V fault containment without adding series resistance error. Use Value: Prevents latch-up and permanent damage to precision instrumentation amplifiers during ±35V cable discharge events-maintaining calibration integrity across maintenance cycles. |
Use Scenario: Modular ATE fixtures where daughterboards are inserted under partial power, exposing unpowered DUT interfaces to live signal rails. IC Role / Device Role / Timing Role: Three-channel protector isolating analog stimulus/response lines during power-ramp transitions, ensuring no fault current flows into unpowered ICs. Use Value: Enables true hot-plug capability for test head modules by guaranteeing open-circuit isolation (<1nA leakage) when V+/V− = 0V-eliminating need for complex power sequencing. |
| Data-Acquisition Front-End Guarding | Redundant System Signal Isolation |
Use Scenario: High-resolution (16+ bit) data loggers acquiring from remote sensors via long cables prone to ESD and induced surges. IC Role / Device Role / Timing Role: First-stage analog protector before anti-aliasing filter and programmable-gain amplifier-limiting transient energy before signal conditioning. Use Value: Maintains DC accuracy (≤0.001% gain error) via 100Ω RON, while clamping fast transients to ±1.5V beyond rails-preserving SNR in 100dB+ dynamic range systems. |
Use Scenario: Dual-redundant flight control electronics where primary and backup analog sensor paths must remain electrically isolated during fault propagation. IC Role / Device Role / Timing Role: Bidirectional protector on shared analog bus lines, blocking fault currents between redundant channels while passing nominal signals. Use Value: Enforces fail-operational behavior by preventing single-point overvoltage faults from propagating across redundancy boundaries-meeting DO-254 safety objectives. |
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 |
|---|---|---|---|
| MAX366CPA | Same core functionality but in 8-pin plastic DIP; 0°C to +70°C temp range vs. −40°C to +85°C | Lower-cost option for commercial-grade non-industrial environments; not qualified for extended temperature cycling | Select MAX366CPA only if ambient operating temperature remains strictly within 0–70°C and board space allows DIP footprint |
| MAX367ESA | Eight-channel version in same 18-pin SO package; identical electrical specs per channel | Higher channel density for multi-signal interfaces (e.g., 8-channel DAQ), but requires larger PCB area and different pinout | Choose MAX367ESA when protecting ≥4 analog lines on same board-reducing component count despite higher pin count |
Compared with MAX366CPA, the MAX366ESA+T offers extended temperature support and surface-mount reliability; compared with MAX367ESA, it delivers optimal cost-per-channel for 3-signal applications without over-provisioning pin count or board area.
Availability
MAX366ESA+T is available at Aetrix Electronics and suitable for process control systems, hot-insertion boards, and data-acquisition front-ends requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MAX366ESA+T 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 precision analog, mixed-signal, and power-management ICs for industrial, automotive, and communications applications-with emphasis on high-reliability, low-power, and fault-tolerant architectures.
The MAX366ESA+T belongs to Maxim's signal-line protection product line, engineered specifically to safeguard sensitive analog interfaces against real-world overvoltage threats-including hot-swap transients, power-rail collapse, and field-wiring faults-without compromising signal fidelity.
FAQ
What is the maximum continuous fault voltage the MAX366ESA+T can withstand?
The MAX366ESA+T guarantees ±40V maximum overvoltage protection-meaning it safely limits fault current when input or output terminals experience up to 40V beyond either supply rail, whether power is applied or off. With ±15V supplies, this translates to ±35V absolute input tolerance; with supplies off (V+=V−=0V), full ±40V isolation is maintained. This rating is validated per Absolute Maximum Ratings table in the official datasheet.
Can the input and output pins of the MAX366ESA+T be swapped in the PCB layout?
Yes-the MAX366ESA+T features fully symmetrical two-terminal protectors: IN1/OUT1, IN2/OUT2, and IN3/OUT3 are functionally identical and interchangeable. The device contains no directional circuitry; signal flow direction is irrelevant. This allows flexible routing-e.g., placing the "IN" side near connectors and "OUT" side toward ICs-or reversing orientation without redesign. Pin 1 (OUT1) may serve as input if desired.
Does the MAX366ESA+T require external components to operate?
No-the MAX366ESA+T operates autonomously with only V+ and V− supply connections and series placement in the signal path. It has no control pins, configuration registers, or external bias requirements. Its protection behavior emerges inherently from internal FET thresholds and supply voltages. External components (e.g., RC networks for power sequencing) are optional enhancements-not functional prerequisites for basic overvoltage clamping.
What is the leakage current specification for the MAX366ESA+T at elevated temperatures?
The MAX366ESA+T specifies ≤1nA signal-path leakage at +25°C. At maximum operating temperature (+85°C), leakage increases to ≤100nA per channel (per Electrical Characteristics table, "IIN(ON)" row, C/E/M temp range). This remains sufficiently low to avoid measurable offset in 1MΩ-input op-amps or 16-bit SAR ADC reference buffers-confirming suitability for precision analog systems across its full rated range.
How does the MAX366ESA+T behave during power-up and power-down transitions?
During power ramp-up, the MAX366ESA+T remains in high-impedance (open-circuit) state until V+ and V− exceed the input signal by ~1.5V-preventing glitchy turn-on. During power-down, it transitions smoothly to open-circuit as supplies collapse, maintaining isolation down to 0V. No "snapback" or polarity reversal occurs. This behavior is intrinsic to its FET-based architecture and is verified in Typical Operating Characteristics curves (Fig. MAX366/7-02 through -07).
MAX366ESA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Clamping:
- ±40V
- Technology:
- Mixed Technology
- Number of Circuits:
- 3
- Applications:
- General Purpose
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX366ESA+T FAQ
1.How can I place an order for MAX366ESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX366ESA+T 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 MAX366ESA+T reliable?
The price and inventory of MAX366ESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX366ESA+T is usually 5 days.
3.What payment methods are accepted for MAX366ESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX366ESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX366ESA+T?
MAX366ESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX366ESA+T 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 MAX366ESA+T?
For technical support, including MAX366ESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX366ESA+T requirements.
6.How does Aetrix verify that MAX366ESA+T is sourced from the original manufacturer or authorized distributors?
All MAX366ESA+T 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 MAX366ESA+T meets industry standards.
7.What is the process for return or replacement of MAX366ESA+T?
All MAX366ESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX366ESA+T, 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 MAX366ESA+T part is unused and in its original packaging.
Return procedure for MAX366ESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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