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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:2,629
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Product details
Overview
The MAX329CWE from Maxim Integrated is a differential 2-of-8 monolithic CMOS analog multiplexer with ultra-low off-leakage (1pA typ at +25°C), 2.5kΩ typical on-resistance, ±5V to ±18V dual-supply operation, and 1.5µs switching time-designed for high-precision data-acquisition systems requiring fault-tolerant signal routing into high-impedance op amps or ADCs.
For engineers reviewing the MAX329CWE datasheet, MAX329CWE pinout, MAX329CWE application, or MAX329CWE equivalent, key selection criteria include its differential channel architecture, guaranteed sub-10nA leakage over temperature, pin compatibility with DG509 and MAX359, and suitability for 120V AC fault-tolerant designs using external 39kΩ resistors.
Technical Context
The MAX329CWE implements a true differential 2-channel select architecture: two independent bidirectional analog paths (DA/DB) are routed simultaneously from corresponding input pairs (S1A/S1B through S4A/S4B) under 2-bit address control (A0, A1). Its CMOS switch design ensures rail-to-rail analog signal range and latchup-proof operation.
It supports unbalanced supply configurations (e.g., +12V/–5V), maintains <±10nA off-leakage across –40°C to +85°C operating range, and delivers 84dB off-isolation at 500kHz with 4.0pF drain off-capacitance-enabling high-resolution signal integrity in low-current sensor front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Analog Signal Range | ±15V - supports rail-to-rail input/output swing with ±15V supplies |
| Drain-Source On-Resistance | 2.5kΩ typ - ensures minimal voltage drop and gain error in precision gain stages |
| Off-Leakage Current | 1pA typ at +25°C - enables sub-µV error in 40kΩ fault-protection networks |
| Switching Time | 1.5µs max - allows sampling rates up to ~330kHz in sequential acquisition |
| Supply Voltage Range | ±5V to ±18V - operates across industrial and aerospace power rails without level-shifting |
| Off-Isolation | 84dB at 500kHz - suppresses crosstalk between active and inactive differential channels |
| Charge Injection | 4pC max - minimizes settling error in sample-and-hold circuits |
Pinout & Package
MAX329CWE is supplied in a 16-pin Wide SO (Small Outline) package with exposed pad (RoHS-compliant, lead-free).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3 | V− | Negative supply rail connection; required for bipolar operation and leakage control |
| 2, 16 | A0, A1 | 2-bit binary address inputs selecting one of four differential channel pairs (S1A/S1B to S4A/S4B) |
| 6, 7 | DA, DB | Differential analog outputs - bidirectional, rail-to-rail capable, matched for common-mode rejection |
| 4–5, 8–11 | S1A–S4A, S1B–S4B | Eight dedicated analog inputs grouped as four differential pairs; each pair connects simultaneously to DA/DB when selected |
| 12 | V+ | Positive supply rail; must be ≥|V−| for full analog range compliance |
| 13 | GND | Logic ground reference; separate from analog signal ground in mixed-signal layouts |
| 14 | EN | Active-high enable; disables all switches and reduces supply current to <200µA when low |
Key Features
| Feature | Design Value |
|---|---|
| Differential 2-of-8 switching | Simultaneous routing of two matched analog signals preserves phase and amplitude relationships critical for instrumentation amplifiers |
| Ultra-low 1pA off-leakage | Enables >17-bit resolution in 10V full-scale systems with 39kΩ fault-protection resistors across –40°C to +85°C |
| Bidirectional analog path | Supports both multiplexing (S→D) and demultiplexing (D→S) without signal polarity constraints |
| Pin-compatible with DG509/MAX359 | Allows drop-in replacement in legacy designs without PCB revision or layout change |
| Rail-to-rail analog range | Accepts input signals extending to V+ and V− rails, eliminating need for external clamping diodes |
Applications
| Aircraft Heads-Up Display (HUD) Sensor Interface | Data-Acquisition System Front-End |
|---|---|
Use Scenario: Routing multiple high-impedance aircraft attitude and airspeed sensor outputs to a shared ADC while maintaining signal fidelity under EMI-rich cockpit environments. IC Role / Device Role / Timing Role: Differential analog multiplexer providing simultaneous dual-channel sampling with 84dB channel isolation and sub-10nA leakage-induced offset drift. Use Value: Eliminates external protection diodes and enables direct interface to 24-bit sigma-delta ADCs with <0.5ppm linearity error over temperature. | Use Scenario: Selecting among eight thermocouple or strain-gauge bridges in a modular test instrument, where leakage-induced DC errors must remain below 100nV. IC Role / Device Role / Timing Role: Fault-tolerant 2-channel analog switch enabling 120V AC line fault survival via external 39kΩ resistors without component damage. Use Value: Guarantees <39µV error at +125°C (10pA × 39kΩ), supporting 17-bit effective resolution across full industrial temperature range. |
| Control Systems with Redundant Sensing | Signal Routing in Precision Calibration Equipment |
Use Scenario: Dual-redundant pressure transducer monitoring in safety-critical hydraulic control units, requiring matched channel tracking and fail-safe open-circuit detection. IC Role / Device Role / Timing Role: Differential multiplexer delivering matched RDS(ON) (<2% variation) and identical charge injection across DA/DB paths for common-mode rejection. Use Value: Enables real-time comparison of redundant sensor outputs with <1 LSB mismatch in 16-bit systems, reducing false trip events. | Use Scenario: Switching calibration reference voltages (1.2V, 2.5V, 4.096V, 5.0V) and zero-offset points into metrology-grade DMM front-ends during automated self-test sequences. IC Role / Device Role / Timing Role: Low-leakage, low-charge-injection analog switch ensuring reference integrity during hot-switching without settling delays. Use Value: Achieves <1µV post-switching settling in <5µs, cutting calibration cycle time by 35% versus standard CMOS muxes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential analog multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DG509ACJ | Higher 5nA max off-leakage at +25°C; 100Ω higher RDS(ON); no guaranteed 120V AC fault tolerance | Lacks integrated fault-protection capability; requires external diodes and current-limiting resistors for line-voltage survivability | Select when cost sensitivity outweighs leakage-critical performance and fault robustness is managed externally |
| MAX359CWE+ | Identical pinout and function; same 1pA leakage spec but rated only to +70°C (not –40°C to +85°C) | Not qualified for extended temperature industrial or automotive use; lower thermal reliability margin | Select only for commercial-grade applications where ambient stays within 0°C to +70°C |
Compared with DG509ACJ and MAX359CWE+, the MAX329CWE uniquely combines –40°C to +85°C qualification, guaranteed 120V AC fault survivability with simple 39kΩ resistor networks, and matched differential channel performance-making it the sole choice for ruggedized, high-resolution data loggers and avionics signal conditioning.
Availability
MAX329CWE is available at Aetrix Electronics and suitable for aircraft HUD sensor interfaces, industrial data-acquisition front-ends, control system redundancy monitoring, precision calibration equipment, and fault-tolerant signal routing requiring stable component supply across extended temperature and high-reliability environments.
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, communications, and computing markets.
The MAX328/MAX329 product line was designed specifically for ultra-low-leakage, fault-tolerant analog signal routing in precision measurement and safety-critical systems-emphasizing rail-to-rail operation, differential channel integrity, and robustness against AC line faults.
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 extends from V− to V+, allowing input and output signals to swing fully across the supply rails without clipping-critical for interfacing with high-dynamic-range sensors and precision DACs. The device maintains this range across its full specified supply range of ±5V to ±18V.
Does the MAX329CWE require external protection components to withstand 120V AC faults?
Yes-the MAX329CWE achieves indefinite 120V AC fault tolerance only when used with external 39kΩ, 1/2W resistors on each analog input, as documented in Figure 4 of the datasheet. These resistors limit fault current to safe levels while leveraging the device's internal diode structure. Without them, the MAX329CWE does not provide inherent 120V AC line survivability, despite its low-leakage design.
Is the MAX329CWE pin-compatible with the DG509 analog multiplexer?
Yes-the MAX329CWE is explicitly specified as a pin-for-pin replacement for the DG509 in the datasheet's General Description. Its 16-pin Wide SO footprint, identical pin functions (A0/A1, EN, V+/V−, GND, DA/DB, S1A–S4A/S1B–S4B), and TTL/CMOS logic compatibility allow direct substitution without PCB modification in existing DG509-based designs.
What is the guaranteed off-leakage current specification for MAX329CWE over its full operating temperature range?
The MAX329CWE guarantees ≤±10nA off-leakage current across its full –40°C to +85°C operating temperature range, as confirmed in the Overtemperature Electrical Characteristics table. At +25°C, typical off-leakage is 1pA-1000× lower-but the production-tested limit at extremes remains ±10nA, ensuring predictable error contribution in high-impedance circuits even under worst-case thermal stress.
Can the MAX329CWE operate with unbalanced supply voltages such as +12V and –5V?
Yes-the MAX329CWE is explicitly characterized for unbalanced supply operation, including combinations like +12V/–5V or +5V/–15V. Its CMOS switch architecture and rail-to-rail analog range ensure proper functionality as long as |V+| and |V−| each meet the minimum ±5V requirement and the total supply differential does not exceed ±36V. No external level-shifting or biasing is required.
MAX329CWE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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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