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Analog Devices Inc./Maxim Integrated MAX367CPN
- Part No.:
- MAX367CPN
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Mixed Technology
- Package:
- 18-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX367CPN.pdf
- Description:
- TVS DEVICE MIXED 40V 18-PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:7,109
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Product details
Overview
The MAX367CPN from Maxim Integrated is an 8-channel, two-terminal, voltage-sensitive MOSFET-based analog signal-line protector designed for series insertion in precision analog paths. It operates with bipolar supplies (±2.25V to ±18V) or unipolar supplies (4.5V to 36V), delivers ≤100Ω on-resistance with power applied, limits fault current by increasing resistance when signals approach supply rails, and clamps output to within ~1.5V of V+ or V− during overvoltage events up to ±40V - protecting op-amps, ADCs, and voltage references in data-acquisition systems.
For engineers reviewing the MAX367CPN datasheet, MAX367CPN pinout, MAX367CPN application, or MAX367CPN equivalent, this page provides verified technical context, exact pin-to-terminal mapping for the 18-pin plastic DIP package, confirmed leakage (<1nA at +25°C), fault knee voltage behavior, and real-world alternative options for overvoltage protection in modular industrial interfaces.
Technical Context
The MAX367CPN implements eight independent, symmetrical, two-terminal protectors using enhancement-mode N- and P-channel FET arrays. Each channel requires no control logic, draws <1µA supply current, and transitions automatically between low-resistance conduction (≤100Ω) and high-impedance limiting based solely on relative input voltage versus V+ and V− rails.
During normal operation (signal within ~1.5V of either rail), all three internal FETs conduct to maintain a low-impedance path; during fault conditions (signal exceeding rail by >1.5V), gate threshold biasing causes dramatic resistance rise - clamping output while diverting fault current exclusively between IN/OUT pins, with zero current flow into V+ or V− supply pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Number of Channels | 8 independent, interchangeable signal protectors |
| Supply Voltage Range | ±2.25V to ±18V (bipolar) or +4.5V to +36V (unipolar); supports hot-insertion sequencing |
| Analog Signal Range (fault-free) | VIN/VOUT = (V− + 3V) to (V+ − 1.5V); defines safe linear operating window before clamping |
| On-Resistance (max) | 100Ω at ±10V supplies; ensures minimal signal attenuation in high-impedance circuits |
| Signal-Path Leakage (max) | 1nA at +25°C with no fault; preserves accuracy in µV-level sensor front-ends |
| Fault Protection Range | ±40V beyond supply rails (e.g., ±35V with ±5V supplies); protects during power-up/down transients |
| Power-Off State | Open-circuit isolation up to ±40V; prevents backfeeding and latch-up in unpowered subsystems |
Pinout & Package
MAX367CPN is housed in an 18-pin plastic DIP package (0.300″ wide), with 0.100″ lead pitch and standard through-hole mounting. Pin 1 is located at the left end of the top row when viewed from the top with notch or dot oriented left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | Signal Input/Output Pair 1–3 | Symmetrical terminals; interchangeable IN/OUT roles per channel; no directionality required |
| 4–8 | Signal Input/Output Pair 4–8 | Same bidirectional function as Pins 1–3; enables full 8-channel protection without routing constraints |
| 9 | Negative Supply (V−) | Bias reference for internal P-channel FETs; must be connected for proper fault knee definition |
| 10–14 | Signal Output/Input Pair 4–8 | Redundant labeling confirming symmetry; electrically identical to Pins 4–8 |
| 15–17 | Signal Output/Input Pair 1–3 | Redundant labeling confirming symmetry; electrically identical to Pins 1–3 |
| 18 | Positive Supply (V+) | Bias reference for internal N-channel FETs; sets upper clamp threshold and conduction state |
Key Features
| Feature | Design Value |
|---|---|
| Automatic overvoltage response | No external control lines or programming needed; protection activates purely from voltage differential |
| Power-off open-circuit isolation | IN/OUT terminals fully disconnected when V+ = V− = 0V; prevents backfeed in redundant systems |
| Fault-current limiting without supply loading | All fault current flows only between signal pins; zero current drawn from V+/V− during faults |
| Low-leakage analog path | <1nA leakage at +25°C ensures compatibility with picoamp-level sensor interfaces and precision references |
| Asymmetric fault knee voltages | +1.3V below V+ and +2.0V above V− define precise clamping thresholds for bipolar rail alignment |
Applications
| Process Control I/O Modules | Hot-Swappable ATE Test Heads |
|---|---|
Use Scenario: Analog sensor inputs (e.g., 4–20mA transmitters, RTD bridges) connect to PLC analog input cards exposed to field wiring faults and ground loops. IC Role / Device Role / Timing Role: Series-connected protector on each channel, placed between terminal block and ADC front-end, providing rail-aligned clamping without degrading DC accuracy. Use Value: Prevents op-amp latch-up and ADC damage during 35V transients on 24V-powered modules, while maintaining ≤100Ω path resistance for <0.01% gain error. |
Use Scenario: Automated test equipment inserts/removes DUT interface boards under power, causing unpredictable signal and supply sequencing. IC Role / Device Role / Timing Role: Eight-channel protection on parallel digital/analog bus lines, enabling safe hot-insertion without manual power cycling or external enable logic. Use Value: Eliminates need for mechanical interlocks or sequenced power supplies; guarantees open-circuit isolation during V+ ramp-up and maintains signal integrity post-insertion. |
| Redundant Backup Power Systems | High-Impedance Instrumentation Front-Ends |
Use Scenario: Dual-supply systems (e.g., primary + backup ±15V) where switchover may cause momentary rail collapse or reverse polarity on signal paths. IC Role / Device Role / Timing Role: Bidirectional protector on shared analog monitoring lines between primary and backup controllers, referenced to common V+/V− rails. Use Value: Blocks fault propagation between redundant domains while allowing continuous signal monitoring; survives ±40V cross-rail transients during failover. |
Use Scenario: Low-noise instrumentation amplifiers (e.g., AD8421) receiving µV-level thermocouple or strain-gauge signals in medical or lab equipment. IC Role / Device Role / Timing Role: In-line protector between sensor and amplifier input, powered from same ±5V rails, preserving nanovolt-level resolution. Use Value: Adds ±40V ESD/short-circuit robustness without introducing >1nA leakage or >100Ω series resistance that would degrade CMRR or offset stability. |
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 | 3-channel version in 8-pin PDIP; identical electrical specs per channel but lower channel count and smaller footprint | Suitable for compact designs with ≤3 protected lines; not scalable to 8-channel layouts without multiple packages | Select when board space is constrained and channel count is fixed at three; shares same fault knee behavior and leakage performance |
| ADG467BRZ | 8-channel ±15V-rated analog switch (not protector); no automatic overvoltage response; requires external control logic and lacks fault-clamping | Used for signal routing, not fault protection; cannot replace MAX367CPN in safety-critical overvoltage scenarios | Only consider if system already includes discrete TVS/clamp networks and needs only passive switching; not a functional substitute for autonomous protection |
Compared with MAX366CPA, the MAX367CPN offers higher integration density for multi-channel systems; compared with ADG467BRZ, it delivers autonomous, supply-referenced clamping without control signals - making it uniquely suited for unattended, fault-prone analog interfaces where reliability trumps routing flexibility.
Availability
MAX367CPN is available at Aetrix Electronics and suitable for process control I/O modules, hot-swappable ATE test heads, and redundant backup power systems requiring stable component supply across extended industrial temperature ranges (0°C to +70°C).
Supply support for MAX367CPN 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 product line was engineered specifically for autonomous, zero-configuration overvoltage protection of sensitive analog signal paths in modular, field-deployed equipment - prioritizing rail-aligned clamping, ultra-low leakage, and power-off isolation over programmability or digital control.
FAQ
What is the maximum continuous fault voltage the MAX367CPN can withstand?
The MAX367CPN withstands up to ±40V beyond its supply rails - meaning with ±5V supplies, it handles ±35V transients; with ±15V supplies, ±25V; and with V+ = V− = 0V (power off), it isolates up to ±40V. This rating is specified in the Absolute Maximum Ratings table and validated under worst-case transient conditions per the datasheet's fault knee characterization.
Does the MAX367CPN require external components to function as a protector?
No, the MAX367CPN operates autonomously with only V+ and V− connections - no external resistors, capacitors, or control signals are needed. Its protection behavior is intrinsic to the internal FET array and gate-threshold architecture. External components like RC networks (e.g., Figure 4 in the datasheet) are optional for timing control, not functional prerequisites for basic overvoltage limiting.
Can the input and output pins of the MAX367CPN be swapped in circuit layout?
Yes - every signal pair (e.g., Pins 1 & 15, Pins 2 & 16) is fully symmetrical and interchangeable. The "IN" and "OUT" labels in the datasheet are for functional convenience only; the device has no directional signal path. This allows flexible PCB routing and eliminates orientation-dependent assembly errors for the MAX367CPN.
What happens to the MAX367CPN during power-down sequences?
When V+ and V− drop to 0V, the MAX367CPN enters a high-impedance open-circuit state - isolating input from output up to ±40V. Unlike shunt protectors, it draws zero supply current and imposes no load on upstream sources. This behavior is critical for hot-swap and redundant power systems, and is explicitly confirmed in the "Power Off" section of the datasheet.
Is the MAX367CPN suitable for protecting high-frequency analog signals?
The MAX367CPN maintains flat frequency response up to ~5MHz in 50Ω systems (per Typical Operating Characteristics), but exhibits impedance variation with signal amplitude and supply voltage - making it unsuitable for RF or precision wideband applications. It is optimized for DC–low-MHz industrial analog signals (e.g., sensor outputs, DAC feeds), not high-speed data links or RF front-ends.
MAX367CPN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 18-DIP (0.300", 7.62mm)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Voltage - Clamping:
- ±40V
- Technology:
- Mixed Technology
- Number of Circuits:
- 8
- Applications:
- General Purpose
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 18-PDIP
MAX367CPN FAQ
1.How can I place an order for MAX367CPN through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX367CPN 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 MAX367CPN reliable?
The price and inventory of MAX367CPN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX367CPN is usually 5 days.
3.What payment methods are accepted for MAX367CPN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX367CPN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX367CPN?
MAX367CPN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX367CPN 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 MAX367CPN?
For technical support, including MAX367CPN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX367CPN requirements.
6.How does Aetrix verify that MAX367CPN is sourced from the original manufacturer or authorized distributors?
All MAX367CPN 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 MAX367CPN meets industry standards.
7.What is the process for return or replacement of MAX367CPN?
All MAX367CPN units undergo pre-shipment inspection (PSI). If there is an issue with MAX367CPN, 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 MAX367CPN part is unused and in its original packaging.
Return procedure for MAX367CPN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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