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Analog Devices Inc./Maxim Integrated MAX329CWE+T
- Part No.:
- MAX329CWE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX329CWE+T.pdf
- Description:
- IC SWITCH SP4TX2 3.5KOHM 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,825
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Product details
Overview
MAX329CWE+T 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 (≤1pA at +25°C), 2.5kΩ typical on-resistance, ±5V to ±18V dual-supply operation, bidirectional signal handling, and pin compatibility with DG509 and MAX359 - enabling direct replacement in legacy industrial sensor front-ends.
For engineers reviewing the MAX329CWE+T datasheet, MAX329CWE+T pinout, MAX329CWE+T application, or MAX329CWE+T equivalent, key selection criteria include its guaranteed sub-1pA leakage at +70°C, 1.5µs switching time, fault-tolerant capability with external 39kΩ resistors, rail-to-rail analog signal range, and compatibility with TTL/CMOS logic levels.
Technical Context
The MAX329CWE+T implements a differential 2-channel select architecture using CMOS transmission gates, supporting independent switching of two matched analog paths (S1A/S1B through S4A/S4B) under 3-bit address control (A0, A1) and global enable (EN). Its latchup-proof construction ensures robustness in noisy industrial environments.
It operates across unbalanced supply combinations (e.g., +12V/–5V), maintains analog-signal range from V– to V+, and delivers <0.2µs break-before-make timing to prevent signal shorting during channel transitions - critical for high-fidelity multiplexed sensor arrays.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Analog Signal Range | –15V to +15V - supports rail-to-rail input/output swing with ±15V supplies, enabling full dynamic range utilization in precision instrumentation. |
| Drain-Source On-Resistance | 2.5kΩ typical - low and well-matched RDS(ON) minimizes gain error and channel-to-channel mismatch in multi-channel ADC interfaces. |
| Off-Leakage Current | ≤1pA at +25°C (ID(OFF), IS(OFF)) - enables >16-bit accuracy in high-impedance sensor applications (e.g., pH electrodes, piezoresistive bridges). |
| Switching Time | 1.5µs max - ensures fast channel settling for high-throughput data loggers sampling at ≥100ksps per channel. |
| Supply Voltage Range | ±5V to ±18V - allows flexible system-level power architecture without level-shifting, including mixed-voltage industrial PLC backplanes. |
| Charge Injection | 4pC max - reduces kickback-induced settling errors in sample-and-hold circuits following the multiplexer output. |
| Off-Isolation | 84dB at 500kHz - suppresses crosstalk between active and inactive differential channels in dense signal-routing applications. |
Pinout & Package
MAX329CWE+T is housed in a 16-pin Wide SO (Small Outline) package with exposed pad (RoHS-compliant, lead-free). Pin mapping is validated per Maxim's official datasheet (Rev 3, Feb 2011), Figure "Pin Configurations" and "Pin Description".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0, A1 | Binary Address Inputs | Select one of four differential pairs (S1A/S1B to S4A/S4B); logic-compatible with 0.8V/2.4V TTL thresholds. |
| EN | Enable Control Input | Active-high global enable; disables all switches when low, reducing system power and leakage in standby mode. |
| V+ | Positive Supply Rail | Accepts +5V to +18V; powers internal logic and switch drivers; must be decoupled with 1µF ceramic capacitor. |
| V– | Negative Supply Rail | Accepts –5V to –18V; establishes lower analog rail; requires separate decoupling from V+. |
| GND | Signal Reference Ground | Logic ground reference; isolated from analog return paths in mixed-signal layouts to minimize noise coupling. |
| S1A–S4A, S1B–S4B | Differential Analog Inputs | Bidirectional terminals; each pair (e.g., S1A/S1B) routes one differential signal path to outputs DA/DB. |
| DA, DB | Differential Analog Outputs | Matched output nodes delivering selected differential signal; designed for direct interface to instrumentation amplifiers or fully-differential ADCs. |
Key Features
| Feature | Design Value |
|---|---|
| Fault-tolerant architecture | With external 39kΩ resistors, withstands indefinite 120V AC faults while maintaining <0.39µV error at room temperature - eliminates need for external protection diodes. |
| Rail-to-rail analog range | Operates with inputs and outputs extending to both supply rails (V– and V+), enabling full utilization of ADC input range without clamping or attenuation. |
| Bidirectional signal flow | Supports mux or demux operation - analog signals pass equally well from inputs to outputs or outputs to inputs, simplifying shared-bus designs. |
| Break-before-make switching | Guaranteed 0.2µs minimum open interval prevents momentary shorting between channels - essential for avoiding transient glitches in sensitive measurement circuits. |
| Latchup-proof CMOS process | Immune to destructive latchup under overvoltage or ESD stress, meeting industrial reliability requirements without external current limiting. |
Applications
| High-Voltage Data Acquisition | Industrial Sensor Multiplexing |
|---|---|
Use Scenario: Multiplexing multiple 4–20mA current-loop sensors or high-impedance thermocouple inputs into a single precision ADC in an oil-and-gas downhole monitoring system. IC Role / Device Role / Timing Role: Differential 2-of-8 analog switch providing channel isolation, fault protection, and rail-to-rail signal integrity before the ADC front-end. Use Value: Sub-1pA leakage preserves microvolt-level thermocouple resolution; 120V AC fault tolerance eliminates field failures due to wiring faults in harsh environments. |
Use Scenario: Routing differential outputs from four isolated strain-gauge bridges in an aerospace structural health monitoring unit. IC Role / Device Role / Timing Role: Precision differential multiplexer selecting one bridge pair at a time for low-noise amplification and digitization. Use Value: Matched RDS(ON) and <0.2µs break-before-make ensure minimal gain/phase mismatch and zero inter-channel crosstalk during switching. |
| Avionics Heads-Up Display (HUD) Calibration | Portable Battery-Powered Test Equipment |
Use Scenario: Switching calibration reference voltages (±10V) and sensor feedback signals in real-time HUD alignment systems requiring traceable metrology. IC Role / Device Role / Timing Role: Fault-protected analog switch enabling safe hot-swap of reference sources without disrupting display timing or introducing offset drift. Use Value: Guaranteed 1pA leakage at +70°C ensures <1µV calibration error over operating temperature - meeting MIL-STD-810G thermal cycling requirements. |
Use Scenario: Low-power handheld multimeter with 8-channel differential voltage measurement capability powered by two AA cells. IC Role / Device Role / Timing Role: Ultra-low-leakage multiplexer minimizing battery drain (<200µA total supply current) while preserving 18-bit effective resolution. Use Value: 1.9mW power dissipation with ±15V supplies extends battery life; rail-to-rail operation avoids signal clipping across full measurement range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential analog multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX359CWE+ | Same pinout, identical 2-of-8 differential architecture, but rated only for 0°C to +70°C and specified with higher 5kΩ max RDS(ON). | Lower cost alternative where leakage ≤5pA and on-resistance <5kΩ are acceptable - suitable for non-critical industrial controls. | Select MAX359CWE+ only if system temperature stays within 0°C–70°C and 16-bit resolution is sufficient. |
| ADG509BRZ | Pin-compatible 2-of-8 differential mux from Analog Devices; higher 20pA typical off-leakage, 450Ω typical RDS(ON), and no guaranteed 120V AC fault tolerance. | Better suited for low-on-resistance, high-speed applications (e.g., audio routing) where leakage <1pA is not required. | Choose ADG509BRZ when low on-resistance dominates design priority and fault protection is handled externally. |
Compared with MAX329CWE+T, MAX359CWE+ offers identical form-factor and function but relaxed leakage and temperature specs, while ADG509BRZ trades ultra-low leakage for lower on-resistance and lacks integrated fault tolerance - making MAX329CWE+T the sole choice for high-accuracy, high-reliability differential multiplexing in safety-critical systems.
Availability
MAX329CWE+T is available at Aetrix Electronics and suitable for high-voltage data acquisition, industrial sensor multiplexing, avionics calibration, and portable test equipment requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX329CWE+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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.
The MAX328/MAX329 product line was designed specifically for ultra-low-leakage, fault-tolerant analog signal routing in precision measurement systems - targeting applications where nanovolt-level integrity and 120V AC survivability are mandatory.
FAQ
What is the maximum continuous analog signal voltage range supported by the MAX329CWE+T?
The MAX329CWE+T supports an analog signal range from V– to V+, which spans –15V to +15V when operated with ±15V supplies. This rail-to-rail capability is guaranteed across its full specified supply range of ±5V to ±18V, ensuring signal integrity without clipping in precision instrumentation circuits using the MAX329CWE+T.
Does the MAX329CWE+T require external protection diodes for 120V AC fault tolerance?
No, the MAX329CWE+T does not require external protection diodes. Its internal structure limits input voltage to ±15.7V with ±15V supplies. When used with eight 39kΩ, 1/2W external resistors (as shown in Figure 4 of the datasheet), the MAX329CWE+T indefinitely withstands 120V AC faults - a key differentiator from conventional multiplexers that rely on added diodes.
Is the MAX329CWE+T pin-compatible with the DG509 multiplexer?
Yes, the MAX329CWE+T is explicitly documented as a pin-for-pin replacement for the DG509 in differential multiplexer applications. Its pinout matches DG509 for A0, A1, EN, V+, V–, GND, and all Sx and D terminals - enabling drop-in upgrades in existing designs without PCB changes or layout modifications.
What is the guaranteed maximum off-leakage current for the MAX329CWE+T at its maximum operating temperature?
The MAX329CWE+T guarantees off-leakage current ≤10nA at its maximum rated operating temperature of +70°C, as confirmed by 100% production testing per Note 3 and Note 6 in the datasheet. At +25°C, typical off-leakage is ≤1pA - making it suitable for applications demanding >17-bit resolution in high-impedance sensor interfaces using the MAX329CWE+T.
Can the MAX329CWE+T operate with unbalanced supply voltages such as +12V and –5V?
Yes, the MAX329CWE+T is fully characterized to operate with unbalanced supply combinations including +12V/–5V and +5V/–15V. Its design ensures stable switching performance, rail-to-rail analog range, and leakage specifications remain valid across these asymmetric configurations - a critical feature for mixed-voltage industrial control systems using the MAX329CWE+T.
MAX329CWE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX329CWE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX329CWE+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 MAX329CWE+T reliable?
The price and inventory of MAX329CWE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX329CWE+T is usually 5 days.
3.What payment methods are accepted for MAX329CWE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX329CWE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX329CWE+T?
MAX329CWE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX329CWE+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 MAX329CWE+T?
For technical support, including MAX329CWE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX329CWE+T requirements.
6.How does Aetrix verify that MAX329CWE+T is sourced from the original manufacturer or authorized distributors?
All MAX329CWE+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 MAX329CWE+T meets industry standards.
7.What is the process for return or replacement of MAX329CWE+T?
All MAX329CWE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX329CWE+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 MAX329CWE+T part is unused and in its original packaging.
Return procedure for MAX329CWE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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