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Analog Devices Inc./Maxim Integrated MAX329CWE+
- Part No.:
- MAX329CWE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX329CWE+.pdf
- Description:
- IC SWITCH SP4TX2 3.5KOHM 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,968
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Product details
Overview
The MAX329CWE+ from Maxim Integrated is a differential 2-of-8 monolithic CMOS analog multiplexer designed for high-precision signal routing in data-acquisition and fault-tolerant systems. It features ultra-low off-leakage (±10pA max at +70°C), 2.5kΩ typical on-resistance, ±5V to ±18V dual-supply operation, bidirectional analog signal handling, and pin compatibility with DG509 and MAX359. It enables robust 120V AC fault protection when used with external 39kΩ input resistors.
For engineers reviewing the MAX329CWE+ datasheet, MAX329CWE+ pinout, MAX329CWE+ application, or MAX329CWE+ equivalent, this device is selected for low-error analog switching in high-impedance sensor interfaces, precision instrumentation front-ends, and safety-critical control system signal conditioning where leakage-induced offset and fault resilience are design-critical.
Technical Context
The MAX329CWE+ implements a differential 2-channel selection architecture using CMOS transmission gates controlled by two address bits (A0, A1) and an enable input (EN). Its latchup-proof construction and rail-to-rail analog signal range (±15V with ±15V supplies) support direct interfacing with op amps and ADCs without level-shifting.
It operates across unbalanced supply combinations (e.g., +12V/–5V), maintains sub-1.5µs switching time, and delivers <0.2µs break-before-make interval-critical for preventing signal shorting during channel transitions in multiplexed measurement systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Analog Signal Range | ±15V with ±15V supplies - supports full-rail input/output without clipping in bipolar signal chains |
| Drain-Source On-Resistance | 2.5kΩ typical - ensures minimal gain error and thermal drift in precision gain-setting paths |
| Off-Leakage Current | ±10pA max at +70°C - limits voltage error to <0.4µV when paired with 39kΩ fault-protection resistors |
| Switching Time | 1.5µs max - enables sampling rates up to ~330kHz in time-multiplexed acquisition systems |
| Supply Voltage Range | ±5V to ±18V - accommodates industrial sensor excitation and wide-range signal conditioning rails |
| Enable Turn-On/Off Time | 1.5µs / 1.0µs - allows tight synchronization of channel selection with sample-hold timing |
| Off-Isolation | 84dB at 500kHz - suppresses crosstalk between active and inactive differential channels |
Pinout & Package
MAX329CWE+ is housed in a 16-pin Wide SO (Small Outline) package with exposed pad (RoHS-compliant, lead-free).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0, A1 | Address Inputs | Select one of four differential pairs (S1A/S1B through S4A/S4B); TTL/CMOS compatible logic thresholds |
| EN | Enable Input | Active-high control: disables all switches when low, eliminating channel leakage during idle states |
| V+ | Positive Supply | Accepts +5V to +18V; powers internal logic and switch drivers; connects to exposed pad in TQFN variants |
| V- | Negative Supply | Accepts –5V to –18V; establishes negative rail for bipolar analog signal handling |
| GND | Ground Reference | Logic ground reference; separate from analog signal return to minimize noise coupling |
| S1A–S4A | Differential Input A | Four analog inputs for first side of differential pair; bidirectional signal path |
| S1B–S4B | Differential Input B | Four analog inputs for second side of differential pair; matched to SxA for common-mode rejection |
| DA, DB | Differential Outputs | Two bidirectional output terminals delivering selected differential signal to downstream circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low off-leakage | ±10pA max at +70°C - preserves accuracy in high-impedance pH, thermocouple, and strain-gauge front-ends |
| Bidirectional analog operation | Supports mux and demux configurations - enables shared signal paths in loopback diagnostics and calibration circuits |
| Rail-to-rail analog signal range | Operates with signals extending to V+ and V− rails - eliminates need for external clamping diodes in overvoltage-prone environments |
| Pin compatibility with DG509/MAX359 | Drop-in replacement for legacy designs - reduces redesign effort and qualification time in industrial upgrades |
| Latchup-proof CMOS process | Immune to destructive latchup under transient overvoltage - enhances reliability in noisy factory-floor or avionics installations |
Applications
| High-Voltage Fault-Tolerant Data Acquisition | Precision Differential Sensor Multiplexing |
|---|---|
Use Scenario: Industrial PLC modules acquiring signals from multiple 4–20mA transmitters exposed to 120V AC line faults. IC Role / Device Role / Timing Role: Differential analog multiplexer routing sensor outputs to a single high-resolution ADC while surviving indefinite 120V AC faults. Use Value: Enables use of 39kΩ input resistors to limit fault current, sustaining <0.4µV leakage-induced error at room temperature and maintaining 17-bit effective resolution over –40°C to +85°C. |
Use Scenario: Aerospace heads-up display (HUD) systems multiplexing multiple RTD or thermocouple inputs for temperature monitoring. IC Role / Device Role / Timing Role: Low-leakage differential switch selecting matched sensor pairs to eliminate common-mode drift in ratiometric measurements. Use Value: ±10pA off-leakage prevents >1µV offset in 100kΩ sensor bridges, preserving <0.1°C measurement accuracy without software compensation. |
| Avionics Signal Routing | Portable Medical Instrumentation |
Use Scenario: Aircraft flight control computers routing redundant analog feedback signals (e.g., actuator position, pressure) with fail-safe integrity. IC Role / Device Role / Timing Role: Fault-tolerant 2-of-8 differential mux providing redundancy-aware signal selection under EMI-rich environments. Use Value: 84dB off-isolation at 500kHz suppresses crosstalk between critical flight sensors, and break-before-make timing (<0.2µs) prevents momentary shorts during reconfiguration. |
Use Scenario: Battery-powered patient monitors acquiring ECG, respiration, and SpO₂ signals with minimal power budget. IC Role / Device Role / Timing Role: Low-power analog switch enabling sequential channel scanning while drawing only 1.9mW at ±15V. Use Value: Sub-2mW quiescent power extends battery life in Class II medical devices; rail-to-rail operation avoids signal clipping in ±5V biopotential amplifiers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential analog multiplexing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX359CWE+ | Same pinout, identical electrical specs, but rated for 0°C to +70°C only (no extended temp grade) | Not qualified for industrial or automotive ambient ranges beyond +70°C | Select MAX359CWE+ only for commercial-grade cost-sensitive designs where extended temperature operation is unnecessary |
| DG509DJ | Higher on-resistance (100Ω typ), higher leakage (1nA typ), no fault-tolerance design support | Lacks integrated fault protection; requires external diodes and resistors for 120V AC survival | Choose DG509DJ only for non-critical, low-precision applications where leakage and fault resilience are not design constraints |
Compared with MAX329CWE+, MAX359CWE+ offers identical performance at lower cost but lacks extended temperature qualification, while DG509DJ requires additional external components to achieve basic fault tolerance and introduces significantly higher signal-path errors due to leakage and on-resistance.
Availability
MAX329CWE+ is available at Aetrix Electronics and suitable for high-precision data-acquisition systems, fault-tolerant industrial control units, and aerospace signal-routing applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX329CWE+ 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, medical, and communications markets.
The MAX328/MAX329 product line was engineered specifically for ultra-low-leakage, fault-resilient analog signal routing in precision measurement and safety-critical systems-prioritizing leakage control, rail-to-rail operation, and robustness over speed or integration density.
FAQ
What is the maximum continuous analog signal voltage range supported by the MAX329CWE+?
The MAX329CWE+ supports an analog signal range of ±15V when operated with ±15V supplies. This rail-to-rail capability allows input and output signals to swing fully between the positive and negative supply rails without clipping, making it suitable for bipolar sensor interfaces and instrumentation amplifier outputs. The device maintains this range across its full specified supply range of ±5V to ±18V, though on-resistance and leakage vary slightly with supply voltage.
How does the MAX329CWE+ achieve fault tolerance against 120V AC line faults?
The MAX329CWE+ achieves indefinite 120V AC fault tolerance when used with external 39kΩ, 1/2W resistors on each input. Its internal protection diodes clamp input voltages to approximately ±15.7V, limiting fault current. With ±15V supplies, the resulting power dissipation in each resistor is ~0.28W-within the 1/2W rating. The guaranteed ±10pA max off-leakage ensures induced error remains below 0.4µV at room temperature, preserving measurement integrity during fault conditions.
Is the MAX329CWE+ pin-compatible with the DG509 multiplexer?
Yes, the MAX329CWE+ is explicitly designed as a pin-for-pin replacement for the DG509 in differential multiplexing applications. Pin assignments for address inputs (A0, A1), enable (EN), supply rails (V+, V−), ground (GND), differential inputs (S1A–S4A, S1B–S4B), and outputs (DA, DB) match the DG509 footprint in 16-pin DIP and SO packages. No PCB layout changes are required when upgrading from DG509 to MAX329CWE+, provided the same supply configuration and operating temperature range are maintained.
What is the typical on-resistance of the MAX329CWE+ and how does it affect signal accuracy?
The MAX329CWE+ has a typical drain-source on-resistance (RDS(ON)) of 2.5kΩ at ±15V supplies and +25°C. This value increases slightly at temperature extremes and with lower supply voltages. In precision applications, this resistance introduces gain error and thermal drift when driving high-impedance loads. For example, driving a 10MΩ ADC input results in <0.025% gain error. Designers should account for RDS(ON) variation across temperature and supply voltage when calibrating high-accuracy systems.
Does the MAX329CWE+ support unbalanced dual-supply operation, and what are valid combinations?
Yes, the MAX329CWE+ supports unbalanced dual-supply operation. Valid combinations include +12V/–5V, +5V/–15V, and any pairing where the magnitude of each supply falls within ±5V to ±18V. The device's internal level-shifting circuitry ensures correct logic threshold referencing and analog switch biasing across these configurations. This flexibility simplifies power architecture in mixed-signal systems where positive and negative rails originate from different regulators or converters.
MAX329CWE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Switch Circuit:
- SP4T
- Multiplexer/Demultiplexer Circuit:
- 4:1
- Number of Circuits:
- 2
- On-State Resistance (Max):
- 3.5kOhm
- Channel-to-Channel Matching (ΔRon):
- 70Ohm
- Voltage - Supply, Single (V+):
- 10V ~ 30V
- Voltage - Supply, Dual (V±):
- ±5V ~ 18V
- Switch Time (Ton, Toff) (Max):
- 1.5µs, 1µs
- -3db Bandwidth:
- -
- Charge Injection:
- 2pC
- Channel Capacitance (CS(off), CD(off)):
- 1.8pF, 8pF
- Current - Leakage (IS(off)) (Max):
- 10pA
- Crosstalk:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX329CWE+ FAQ
1.How can I place an order for MAX329CWE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX329CWE+ 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 MAX329CWE+ reliable?
The price and inventory of MAX329CWE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX329CWE+ is usually 5 days.
3.What payment methods are accepted for MAX329CWE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX329CWE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX329CWE+?
MAX329CWE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX329CWE+ 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 MAX329CWE+?
For technical support, including MAX329CWE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX329CWE+ requirements.
6.How does Aetrix verify that MAX329CWE+ is sourced from the original manufacturer or authorized distributors?
All MAX329CWE+ 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 MAX329CWE+ meets industry standards.
7.What is the process for return or replacement of MAX329CWE+?
All MAX329CWE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX329CWE+, 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 MAX329CWE+ part is unused and in its original packaging.
Return procedure for MAX329CWE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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