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Analog Devices Inc./Maxim Integrated MAX328CWE-T
- Part No.:
- MAX328CWE-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX328CWE-T.pdf
- Description:
- IC MUX 8:1 3.5KOHM 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,133
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Product details
Overview
The MAX328CWE-T from Maxim Integrated is a monolithic CMOS 1-of-8 single-ended analog multiplexer designed for high-precision signal routing in data-acquisition and fault-tolerant systems. It features ultra-low off-leakage (1pA typ at +25°C), 2.5kΩ on-resistance, ±15V dual-supply operation, and pin compatibility with DG508/MAX358. It enables 17-bit resolution signal conditioning when used with 40kΩ input resistors in industrial sensor front-ends.
For engineers reviewing the MAX328CWE-T datasheet, MAX328CWE-T pinout, MAX328CWE-T application, or MAX328CWE-T equivalent, this device is selected for low-error analog switching in high-source-impedance circuits, AC fault protection up to 120V RMS, and bidirectional signal routing without rail-to-rail supply constraints.
Technical Context
The MAX328CWE-T implements a CMOS transmission-gate architecture with latchup-proof construction and break-before-make switching (0.2µs interval). Its address decoding logic accepts TTL/CMOS-compatible inputs (VAL ≤0.8V, VAH ≥2.4V) and supports full analog-signal range from V− to V+, including operation with unbalanced supplies like +12V/−5V.
Internal diode clamping enables intrinsic fault tolerance-no external diodes required-while guaranteed leakage performance ensures sub-40nV error contribution under normal 10V signals when paired with 40kΩ series resistors. Switching speed is specified at <1.5µs transition time with ±15V supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Analog Signal Range | −15V to +15V with ±15V supplies; extends to rails, enabling full-scale signal handling without clipping |
| On-Resistance (RDS(ON)) | 2.5kΩ typ at ±15V; ensures minimal gain error and channel-to-channel matching in precision gain stages |
| Off-Leakage Current | 1pA typ at +25°C; limits voltage error to ≤40nV with 40kΩ input resistors in high-Z sensor interfaces |
| Switching Time | 1.5µs max transition time; supports sampling rates up to ~300kHz in multiplexed ADC front-ends |
| Supply Range | ±5V to ±18V dual or +10V to +30V single; accommodates legacy industrial rails and battery-powered portable designs |
| Enable Control | EN pin enables/disables all channels simultaneously; eliminates channel crosstalk during power-down or standby |
| Charge Injection | 4pC max; reduces settling error and pedestal distortion in sample-and-hold circuits |
Pinout & Package
MAX328CWE-T is supplied in a 16-pin Wide SO (SOIC-W) RoHS-compliant package with exposed pad (EP), footprint code W16+2, outline 21-0042, land pattern 90-0107. The exposed pad must be connected to V+ per manufacturer specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3 | V− | Negative supply rail input; referenced to GND; supports −5V to −18V operation |
| 2 | EN | Active-high enable control; disables all switches when low, reducing system leakage and power |
| 4–7, 9–12 | S1–S4, S5–S8 | Bidirectional analog inputs; eight independent channels routed to D based on A2/A1/A0 address |
| 8 | D | Common analog output/input node; connects to op-amp input or ADC sample capacitor |
| 13–15 | A0, A1, A2 | Binary address inputs selecting one of eight channels; TTL/CMOS compatible with 0.8V/2.4V thresholds |
| 11 | V+ | Positive supply rail input; supports +5V to +30V single or +5V to +18V dual supply configurations |
| 12 | GND | Ground reference for digital logic and internal bias networks; separate from analog return paths in layout |
| 16 | EP | Exposed thermal pad; must be soldered to V+ plane for thermal stability and ESD robustness |
Key Features
| Feature | Design Value |
|---|---|
| Fault-tolerant architecture | Withstands indefinite 120V AC faults using only external 39kΩ resistors-no external diodes required |
| Bidirectional signal path | Supports mux or demux operation without polarity constraints; ideal for shared analog bus topologies |
| Rail-to-rail analog range | Signals swing fully from V− to V+; eliminates level-shifting in ±15V instrumentation systems |
| Break-before-make switching | 0.2µs minimum open interval prevents momentary shorting between channels during address changes |
| Latchup-proof process | Immune to destructive latchup under overvoltage or ESD stress-critical for field-deployed equipment |
Applications
| Industrial Data Acquisition | Aircraft Heads-Up Display (HUD) Signal Routing |
|---|---|
Use Scenario: Multiplexing outputs from 8 high-impedance RTD or thermocouple sensor amplifiers into a single 24-bit sigma-delta ADC. IC Role / Device Role / Timing Role: Analog switch providing channel selection with sub-40nV offset error contribution and 1.5µs settling. Use Value: Enables 17-bit effective resolution across temperature range without calibration due to 1pA leakage and matched RDS(ON). |
Use Scenario: Routing multiple video sync, brightness, and symbol overlay signals in avionics HUD control units. IC Role / Device Role / Timing Role: Fault-isolated analog multiplexer ensuring uninterrupted display operation during 120V AC line transients. Use Value: Eliminates need for external protection diodes while sustaining 110V AC faults indefinitely per MIL-STD-704 compliance. |
| Portable Medical Instrumentation | Test & Measurement Equipment |
Use Scenario: Battery-powered ECG front-end selecting among 8 electrode pairs with ultra-low power consumption. IC Role / Device Role / Timing Role: Low-leakage, low-power analog switch enabling 1.9mW total dissipation at ±15V for extended runtime. Use Value: Maintains baseline stability and common-mode rejection by minimizing input bias current injection into instrumentation amps. |
Use Scenario: Automated test system routing calibrated reference voltages and DUT signals to multi-channel digitizers. IC Role / Device Role / Timing Role: Precision multiplexer with 2.5kΩ on-resistance matching and <1.5µs switching for high-throughput calibration sequences. Use Value: Reduces measurement uncertainty by limiting channel-dependent gain error to <0.02% across all 8 paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DG508ACJ+ | Higher typical off-leakage (100pA vs. 1pA); no built-in fault tolerance; requires external diodes for 120V AC protection | Not suitable for uncalibrated high-resolution data acquisition where leakage-induced offset dominates error budget | Select DG508ACJ+ only if cost sensitivity outweighs leakage and fault-protection requirements |
| MAX358CWE+ | Same pinout and function but rated for −40°C to +85°C (E-grade); identical electrical specs except wider temp range | Preferred for automotive or outdoor industrial deployments requiring extended temperature qualification | Choose MAX358CWE+ when operating beyond 0°C to +70°C ambient, otherwise MAX328CWE-T offers optimal C-grade cost/performance |
Compared with DG508ACJ+, MAX328CWE-T delivers 100× lower leakage and integrated fault protection; compared with MAX358CWE+, it trades extended temperature range for lower unit cost in commercial-grade applications.
Availability
MAX328CWE-T is available at Aetrix Electronics and suitable for industrial data acquisition, aircraft HUD systems, and portable medical instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX328CWE-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, communications, and computing markets.
The MAX328CWE-T belongs to Maxim's precision analog multiplexer product line, engineered specifically for low-leakage, fault-tolerant signal routing in high-reliability measurement and control systems.
FAQ
What is the maximum continuous analog signal voltage range supported by the MAX328CWE-T?
The MAX328CWE-T supports an analog signal range from V− to V+, which spans −15V to +15V when operated with ±15V supplies. With single-supply configurations, it handles signals from ground to V+, up to +30V. This rail-to-rail capability eliminates the need for external level-shifting circuitry in ±15V instrumentation systems and ensures full dynamic range utilization in precision applications.
Does the MAX328CWE-T require external protection diodes for 120V AC fault conditions?
No, the MAX328CWE-T does not require external protection diodes for 120V AC fault conditions. Its internal diode clamping structure limits input voltage to approximately ±15.7V with ±15V supplies. When paired with 39kΩ or higher series resistors, the MAX328CWE-T withstands indefinite 120V AC faults without damage-unlike conventional multiplexers such as DG508 that mandate external diodes.
What is the guaranteed maximum off-leakage current for the MAX328CWE-T over its full operating temperature range?
The MAX328CWE-T guarantees off-leakage current of ±5nA maximum over its full 0°C to +70°C operating temperature range, as verified by 100% production testing at +70°C. At +25°C, typical off-leakage is 1pA, contributing less than 40nV error with 40kΩ input resistors-critical for maintaining 17-bit resolution in high-impedance sensor interfaces.
Is the MAX328CWE-T pin-compatible with the DG508 and MAX358 families?
Yes, the MAX328CWE-T is pin-for-pin compatible with both the DG508/DG509 and MAX358/MAX359 families in the 16-pin Wide SO package. This allows direct replacement in existing designs without PCB modifications, preserving layout integrity while upgrading leakage performance, fault tolerance, and power efficiency.
How does the enable (EN) pin function in the MAX328CWE-T, and what is its logic threshold?
The EN pin on the MAX328CWE-T is an active-high digital control that enables or disables all eight analog switches simultaneously. When EN is low (≤0.8V), all channels are disabled, reducing system leakage and power consumption. When EN is high (≥2.4V), channel selection proceeds via A2/A1/A0. This TTL/CMOS-compatible interface simplifies integration with microcontrollers and FPGAs without level-shifting.
MAX328CWE-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Switch Circuit:
- -
- Multiplexer/Demultiplexer Circuit:
- 8:1
- Number of Circuits:
- 1
- 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
MAX328CWE-T FAQ
1.How can I place an order for MAX328CWE-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX328CWE-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 MAX328CWE-T reliable?
The price and inventory of MAX328CWE-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX328CWE-T is usually 5 days.
3.What payment methods are accepted for MAX328CWE-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX328CWE-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX328CWE-T?
MAX328CWE-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX328CWE-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 MAX328CWE-T?
For technical support, including MAX328CWE-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX328CWE-T requirements.
6.How does Aetrix verify that MAX328CWE-T is sourced from the original manufacturer or authorized distributors?
All MAX328CWE-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 MAX328CWE-T meets industry standards.
7.What is the process for return or replacement of MAX328CWE-T?
All MAX328CWE-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX328CWE-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 MAX328CWE-T part is unused and in its original packaging.
Return procedure for MAX328CWE-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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