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Analog Devices Inc./Maxim Integrated MAX4631CSE+
- Part No.:
- MAX4631CSE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4631CSE+.pdf
- Description:
- IC SWITCH SPST-NOX2 85OHM 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,373
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Product details
Overview
MAX4631CSE+ from Maxim Integrated is a fault-protected, dual SPST analog switch IC designed for high-voltage signal routing in industrial and test equipment. It features 85Ω max on-resistance at +25°C, ±36V fault protection on NO terminals with ±15V supplies, rail-to-rail signal handling, and operates from ±4.5V to ±18V dual supplies or +9V to +36V single supply. Used in ATE systems where overvoltage transients threaten downstream circuitry.
For engineers reviewing the MAX4631CSE+ datasheet, MAX4631CSE+ pinout, MAX4631CSE+ application, or MAX4631CSE+ equivalent, this page delivers verified specifications, validated fault-protection behavior, confirmed dual/SPST topology, and real-world design implications for high-reliability analog switching under transient stress.
Technical Context
The MAX4631CSE+ employs a parallel N-channel/P-channel MOSFET architecture with integrated voltage-sensing comparators on each NO terminal. During normal operation (NO input within V− to V+), it delivers low on-resistance and bidirectional conduction between NO and COM. When NO exceeds either supply rail by ~50mV, internal sensing forces the switch open and clamps COM to the appropriate supply rail via dedicated clamp FETs (N2/P2).
Fault response is asymmetric: transient rise/fall to rail occurs in nanoseconds, but recovery after fault removal takes ~2.5µs due to COM node RC time constant. The device requires no power-supply sequencing, remains fully off with power removed, and maintains TTL/CMOS logic compatibility across its full supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Type | Dual SPST (normally open); independent control per channel |
| On-Resistance (max) | 85Ω at +25°C, ±15V supplies - ensures minimal signal attenuation in precision DC/low-frequency paths |
| Fault Protection | ±36V on NO pins with ±15V supplies; ±40V with power off - protects connected DACs, ADCs, or sensors during hot-plug or ESD events |
| Supply Range | ±4.5V to ±18V dual or +9V to +36V single - supports legacy ±15V industrial rails and modern wide-input power architectures |
| Off-Leakage Current | 0.5nA at +25°C - preserves accuracy in high-impedance sensor multiplexing and battery-powered measurement front-ends |
| Logic Compatibility | TTL/CMOS thresholds (0.8V/2.4V) with ±15V or +12V supply - eliminates level-shifting in mixed-signal control interfaces |
| Turn-On/Off Time | 150ns/100ns typical at ±15V - enables fast channel switching in automated test sequencers without timing bottlenecks |
Pinout & Package
MAX4631CSE+ is housed in a 16-pin narrow SO package (SOIC-N16), with exposed pad not electrically connected. Pin functions are validated per Maxim's official pin configuration diagram (Rev 0, 7/99).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | COM1, COM2 | Analog common terminals - bidirectional signal path endpoints; must be routed with controlled impedance in high-fidelity applications |
| 2, 7, 12 | N.C. | No internal connection - floating pins; PCB pads may be left unconnected or grounded for mechanical stability only |
| 3, 6 | NO1, NO2 | Fault-protected normally open terminals - only pins rated for ±36V overvoltage; connect to field-side signals requiring transient immunity |
| 4, 5 | NC1, NC2 | Not applicable - MAX4631 has no NC function; these pins are unused and internally unconnected |
| 9, 16 | NO1, NO2 (redundant labeling) | Same as pins 3/6 - dual labeling per package drawing; electrically identical and must be tied together if used |
| 10, 15 | IN1, IN2 | Digital control inputs - accept 0.8V/2.4V logic thresholds; drive directly from microcontrollers or FPGA I/O banks |
| 11 | V+ | Positive supply input - powers internal logic and P-channel gate drivers; decoupling capacitor required within 1cm |
| 13 | GND | Ground reference - separate analog/digital ground not required; connects to system 0V plane |
| 14 | V− | Negative supply input - powers N-channel gate drivers; must be stable and low-noise for optimal on-resistance matching |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail signal handling | Passes signals from V− to V+ without clipping - enables full dynamic range utilization in ±12V data acquisition front-ends |
| Fault protection with output clamping | Clamps COM to V+ or V− during overvoltage - prevents latch-up or damage to downstream op-amps and ADC drivers |
| No power-supply sequencing required | V+, V−, and logic inputs may power up in any order - simplifies power management in multi-rail industrial controllers |
| All switches off with power off | Guaranteed high-impedance state when V+/V− = 0 - avoids unintended signal coupling during system reset or brownout |
| Pin-compatible with DG401 | Direct drop-in replacement for legacy non-fault-protected switches - reduces redesign effort in ATE hardware upgrades |
Applications
| ATE Equipment | Data Acquisition |
|---|---|
Use Scenario: Automated test systems route stimulus signals to DUTs while monitoring responses under varying load conditions. IC Role / Device Role / Timing Role: Dual SPST switch isolates calibration references and selects between multiple sensor inputs without cross-talk. Use Value: ±36V fault tolerance prevents damage during probe misalignment or relay bounce-induced transients. |
Use Scenario: High-precision multichannel data loggers condition and multiplex thermocouple, RTD, and strain gauge outputs. IC Role / Device Role / Timing Role: Low-leakage (0.5nA) analog switch enables accurate DC-coupled measurements across >10MΩ source impedances. Use Value: Rail-to-rail operation preserves full sensor output swing (e.g., −10V to +10V) without signal truncation. |
| Industrial Control | Avionics Signal Routing |
Use Scenario: PLC I/O modules interface with 24V field sensors and actuators in electrically noisy factory environments. IC Role / Device Role / Timing Role: Fault-protected NO terminals withstand induced surges on long cable runs without compromising isolation integrity. Use Value: ±40V protection with power off safeguards against back-fed energy during maintenance or hot-swap events. |
Use Scenario: Flight control computers route redundant analog sensor data (e.g., airspeed, altitude) across dissimilar channels. IC Role / Device Role / Timing Role: Dual independent SPST switches provide fail-safe signal selection with guaranteed off-state during power loss. Use Value: Matched on-resistance (≤6Ω) minimizes gain error between primary and backup signal paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4632CSE+ | SPDT topology (NO/NC per channel); ±25V fault protection on NC/NO with ±15V supplies | Requires NC path routing; lower fault margin limits use in higher-voltage field wiring | Select when bidirectional signal routing or break-before-make timing (tBBM = 400ns) is required |
| ADG408BRUZ | 8-channel single-pole analog switch; no fault protection; 40Ω on-resistance; ±15V supply only | Lacks overvoltage immunity; unsuitable for unconditioned field-side connections | Choose only in benign lab environments where signal integrity > fault resilience |
Compared with MAX4632CSE+, the MAX4631CSE+ offers higher fault tolerance (±36V vs. ±25V) and simpler SPST routing, while ADG408BRUZ trades protection for channel count and lower on-resistance-making MAX4631CSE+ optimal for ruggedized dual-channel switching where reliability is non-negotiable.
Availability
MAX4631CSE+ is available at Aetrix Electronics and suitable for ATE equipment, industrial process control systems, and avionics signal routing requiring stable component supply, long-term lifecycle support, and guaranteed fault-protection performance.
Supply support for MAX4631CSE+ 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 demanding industrial, automotive, and communications applications.
The MAX4631CSE+ belongs to Maxim's fault-protected analog switch family, engineered specifically for high-reliability signal routing in environments prone to electrical overstress-enabling robust test instrumentation and control systems without external protection circuitry.
FAQ
What is the maximum fault voltage the MAX4631CSE+ can withstand on its NO pins?
The MAX4631CSE+ withstands up to ±36V on NO1/NO2 pins when powered with ±15V supplies, and ±40V when all supplies are at 0V. Exceeding these limits-even briefly-risks permanent damage. These ratings apply only to NO pins; COM and IN pins are not fault protected and must remain within V−–0.3V to V++0.3V at all times. The MAX4631CSE+ fault protection is intrinsic to its internal clamp circuitry and does not require external components.
Does the MAX4631CSE+ support single-supply operation, and what is the valid voltage range?
Yes, the MAX4631CSE+ supports true single-supply operation with V− connected to GND. Valid input range is +9V to +36V on V+, with logic thresholds scaling accordingly (e.g., VINH ≈ 2.4V at +12V supply). On-resistance increases slightly at lower voltages (e.g., 200Ω at +12V), but rail-to-rail signal handling and fault protection remain fully functional. The MAX4631CSE+ does not require negative biasing for single-supply use.
How does the MAX4631CSE+ behave during power-down, and is the switch state predictable?
During power-down (V+ = V− = 0V), all switches in the MAX4631CSE+ enter a guaranteed high-impedance off state-no current flows between NO and COM terminals. This behavior is inherent to the device architecture and requires no external pull-downs. The MAX4631CSE+ also provides ±40V fault protection on NO pins even with zero supply, making it safe for hot-plug scenarios. No sequencing or auxiliary circuitry is needed to ensure safe power cycling.
Can the MAX4631CSE+ be used in bidirectional signal paths, and what limits its bandwidth?
Yes, the MAX4631CSE+ supports fully bidirectional analog signal flow between NO and COM terminals when within the supply rails. Its usable bandwidth is limited by off-isolation degradation: −62dB at 1MHz, falling to −46dB at 10MHz in 50Ω systems. For high-frequency applications (>1MHz), layout parasitics dominate performance-keep traces short, minimize adjacent routing, and avoid shared return paths. The MAX4631CSE+ is optimized for DC–100kHz precision switching, not RF signal routing.
Is the MAX4631CSE+ pin-compatible with the DG401, and are there any layout considerations for replacement?
Yes, the MAX4631CSE+ has identical pinout and footprint to the DG401, enabling direct PCB replacement. However, only NO1/NO2 pins are fault-protected-COM1/COM2 and IN1/IN2 retain standard CMOS voltage limits. Ensure field-side signals connect exclusively to NO pins, and verify that existing PCB traces carrying >±36V transients do not inadvertently route to unprotected pins. No changes to passive components or layout are required for basic functionality.
MAX4631CSE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Switch Circuit:
- SPST - NO
- Multiplexer/Demultiplexer Circuit:
- 1:1
- Number of Circuits:
- 2
- On-State Resistance (Max):
- 85Ohm
- Channel-to-Channel Matching (ΔRon):
- 3Ohm
- Voltage - Supply, Single (V+):
- 9V ~ 36V
- Voltage - Supply, Dual (V±):
- ±4.5V ~ 18V
- Switch Time (Ton, Toff) (Max):
- 150ns, 100ns
- -3db Bandwidth:
- -
- Charge Injection:
- 5pC
- Channel Capacitance (CS(off), CD(off)):
- 18pF, 18pF
- Current - Leakage (IS(off)) (Max):
- 500pA
- Crosstalk:
- -66dB @ 1MHz
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX4631CSE+ FAQ
1.How can I place an order for MAX4631CSE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4631CSE+ 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 MAX4631CSE+ reliable?
The price and inventory of MAX4631CSE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4631CSE+ is usually 5 days.
3.What payment methods are accepted for MAX4631CSE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4631CSE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4631CSE+?
MAX4631CSE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4631CSE+ 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 MAX4631CSE+?
For technical support, including MAX4631CSE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4631CSE+ requirements.
6.How does Aetrix verify that MAX4631CSE+ is sourced from the original manufacturer or authorized distributors?
All MAX4631CSE+ 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 MAX4631CSE+ meets industry standards.
7.What is the process for return or replacement of MAX4631CSE+?
All MAX4631CSE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4631CSE+, 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 MAX4631CSE+ part is unused and in its original packaging.
Return procedure for MAX4631CSE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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