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Analog Devices Inc./Maxim Integrated MAX328CWE+
- Part No.:
- MAX328CWE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX328CWE+.pdf
- Description:
- IC MUX 8:1 3.5KOHM 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,994
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Product details
Overview
The MAX328CWE+ from Maxim Integrated is a monolithic CMOS 1-of-8 single-ended analog multiplexer with ultra-low off-leakage (1pA typ at +25°C), 2.5kΩ on-resistance, and ±5V to ±18V dual-supply or 10V–30V single-supply operation. It serves as a precision signal-routing device in high-impedance data-acquisition front-ends, enabling fault-tolerant operation when paired with 40kΩ input resistors - sustaining indefinite 110V AC faults while maintaining <40nV error on normal signals.
For engineers reviewing the MAX328CWE+ datasheet, MAX328CWE+ pinout, MAX328CWE+ application, or MAX328CWE+ equivalent, key selection criteria include leakage-critical channel switching, rail-to-rail analog signal handling, TTL/CMOS-compatible address control, sub-1.5µs transition time, and pin compatibility with DG508 and MAX358 in legacy industrial and aerospace signal routing designs.
Technical Context
The MAX328CWE+ implements a CMOS transmission-gate architecture with latchup-proof construction, supporting bidirectional analog signal flow between eight inputs (S1–S8) and one common output (D). Its address decoding logic (A0/A1/A2) and enable (EN) control operate independently of supply polarity, allowing robust function across unbalanced rails like +12V/–5V.
Internal protection diodes eliminate need for external clamping in fault-tolerant configurations; combined with guaranteed 1pA max off-leakage at +70°C and <2.5kΩ on-resistance flatness (<2% variation), it delivers stable gain accuracy and minimal charge injection (4pC) in precision measurement paths interfacing op amps or SAR ADCs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Analog Signal Range | ±15V - supports rail-to-rail input/output swing with ±15V supplies, enabling full dynamic range utilization in bipolar sensor interfaces. |
| On-Resistance (RDS(ON)) | 2.5kΩ typ - low and consistent resistance minimizes gain error and channel-to-channel mismatch in precision gain-setting networks. |
| Off-Leakage Current | 1pA typ at +25°C - ensures <40nV offset error when used with 40kΩ series resistors, critical for 16+ bit resolution systems. |
| Switching Time | 1.5µs max - enables fast channel scanning in multi-sensor data loggers without introducing timing-induced settling errors. |
| Supply Voltage Range | ±5V to ±18V dual or 10V–30V single - accommodates diverse system power architectures including isolated industrial supplies and portable battery-powered designs. |
| Enable Turn-On/Off Time | tON(EN) = 1.5µs, tOFF(EN) = 1.0µs - allows precise synchronous gating of analog channels in time-triggered acquisition systems. |
| Charge Injection | 4pC max - limits voltage glitch on high-impedance hold capacitors, preserving accuracy in sample-and-hold and switched-capacitor circuits. |
Pinout & Package
MAX328CWE+ uses a 16-pin Wide SO (SOIC-W) RoHS-compliant package with exposed pad (EP connected to V+ per datasheet). Pin numbering follows standard SOIC layout with pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3 | V− | Negative supply rail connection; required for dual-supply operation and defines lower analog signal limit. |
| 2, 4–7 | S1–S4 | Bidirectional analog input channels; internally routed to transmission gates controlled by A0/A1/A2. |
| 8 | D | Common bidirectional analog output/input node; connects to all selected Sx channels during active state. |
| 9–12 | S8–S5 | Bidirectional analog input channels; continuation of S1–S4 set, completing 1-of-8 selection matrix. |
| 13 | V+ | Positive supply rail connection; defines upper analog signal limit and powers internal logic and switches. |
| 14 | GND | Digital and analog reference ground; must be low-impedance return path for address/control signals and leakage current. |
| 15 | A0 | LSB address input; binary-coded selection of active channel (e.g., A2A1A0 = 000 selects S1). |
| 16 | EN | Active-high enable; disables all switches (high-Z state) when low, preventing signal coupling during reconfiguration. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low off-leakage | 1pA typ at +25°C - preserves signal integrity in >10GΩ source impedance applications such as piezoelectric sensor conditioning. |
| Fault-tolerant configuration | Indefinite 110V AC fault withstand with 40kΩ external resistors - eliminates need for external TVS/clamp diodes in harsh industrial environments. |
| Rail-to-rail analog range | Operates with inputs extending to V+ and V− rails - enables direct interface with sensors spanning full supply range without level-shifting. |
| Break-before-make switching | 0.2µs minimum open interval - prevents momentary shorting between channels during address transitions, avoiding signal corruption. |
| Pin compatibility | Direct replacement for DG508 and MAX358 - allows drop-in upgrade in existing PCB layouts without redesign or requalification. |
Applications
| High-Voltage Fault-Tolerant Data Acquisition | Aerospace Sensor Signal Routing |
|---|---|
Use Scenario: Industrial PLC modules acquiring signals from thermocouples, strain gauges, and RTDs in electrically noisy factory floors with risk of 120V AC line faults. IC Role / Device Role / Timing Role: Precision 1-of-8 analog multiplexer selecting sensor inputs before feeding into a 24-bit ΣΔ ADC, with EN synchronized to ADC conversion start. Use Value: Guaranteed 1pA leakage ensures ≤0.4µV offset error across temperature, enabling true 20-bit effective resolution even under sustained 110V AC fault conditions. |
Use Scenario: Aircraft heads-up display (HUD) systems aggregating analog video sync pulses, attitude sensor outputs, and radar return signals for real-time overlay rendering. IC Role / Device Role / Timing Role: Low-noise, rail-to-rail analog switch routing multiple sensor streams to a shared video processing pipeline with sub-microsecond channel switching. Use Value: 1.5µs max transition time and break-before-make architecture prevent cross-talk glitches during rapid HUD mode changes, ensuring visual fidelity. |
| Portable Battery-Powered Logging | Control System I/O Expansion |
Use Scenario: Handheld environmental monitors logging pH, dissolved oxygen, and conductivity from multiple probes using a single low-power microcontroller ADC. IC Role / Device Role / Timing Role: Low-power analog mux enabling sequential sampling of up to eight electrochemical sensors while minimizing quiescent current draw from coin-cell battery. Use Value: 1.9mW total power dissipation at ±15V and 1µA max supply current extend battery life beyond 12 months in intermittent-read deployments. |
Use Scenario: Modular PLC backplanes requiring flexible analog input expansion across multiple vendor-specific I/O cards with varying supply configurations. IC Role / Device Role / Timing Role: Universal analog switch supporting both ±15V and +24V single-supply operation, accepting unbalanced rails like +12V/–5V without performance degradation. Use Value: Dual-supply flexibility and pin compatibility with legacy DG508 simplify integration into mixed-vendor control cabinets without custom adapter design. |
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 on-resistance (100Ω min), higher off-leakage (10nA typ), no fault-tolerance design - requires external protection diodes for AC fault handling. | Limited to low-voltage, low-precision applications where leakage and fault immunity are non-critical. | Select DG508ACJ+ only if cost sensitivity outweighs leakage and fault requirements; not suitable for 16+ bit systems or harsh environments. |
| MAX358CWE+ | Same pinout and electrical specs as MAX328CWE+, but rated for –40°C to +85°C extended temperature range and specified with tighter RDS(ON) matching (±1.5%). | Targeted at automotive and extended-temperature industrial deployments where thermal stability is mandatory. | Choose MAX358CWE+ when operating ambient exceeds +70°C or when channel-to-channel on-resistance matching below 2% is required across temperature. |
Compared with DG508ACJ+, MAX328CWE+ delivers 10,000× lower leakage and integrated fault tolerance; versus MAX358CWE+, it trades extended temperature rating for lower cost in commercial-grade applications where 0°C to +70°C suffices.
Availability
MAX328CWE+ is available at Aetrix Electronics and suitable for high-precision data-acquisition systems, aerospace sensor interfaces, and portable environmental monitoring equipment requiring stable component supply across long production lifecycles.
Supply support for MAX328CWE+ 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 semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The MAX328CWE+ belongs to Maxim's precision analog multiplexer product line, designed specifically for leakage-sensitive, fault-prone signal-routing applications in test equipment, avionics, and industrial automation.
FAQ
What is the maximum continuous analog signal voltage range supported by the MAX328CWE+?
The MAX328CWE+ supports an analog signal range of ±15V when operated with ±15V supplies, and maintains rail-to-rail operation - meaning input and output signals can swing from V− to V+ without clipping. This is confirmed in the Electrical Characteristics table under "Analog Signal Range" with VANALOG = –15V to +15V, and applies directly to the MAX328CWE+ at +25°C with ±15V supplies.
Does the MAX328CWE+ require external protection components to handle 120V AC faults?
No - the MAX328CWE+ does not require external protection diodes for 120V AC fault tolerance when used with 39kΩ or higher series resistors per input. Its internal diodes clamp input voltages to ±15.7V (with ±15V supplies), and the datasheet explicitly states "No external diodes need to be added with the MAX328/MAX329, unlike conventional multiplexers." This capability is validated in Figure 4 and Applications Information section for the MAX328CWE+.
Is the MAX328CWE+ pin-compatible with the DG508, and what does that mean for PCB layout?
Yes, the MAX328CWE+ is pin-for-pin compatible with the DG508 in 16-pin packages including Wide SO. The datasheet states "The MAX328/MAX329 are pin-for-pin replacements for the popular DG508/DG509 in these applications," and the pin descriptions confirm identical mapping for V+, V−, GND, EN, A0/A1/A2, D, and S1–S8. This means no PCB layout changes are needed when upgrading from DG508ACJ+ to MAX328CWE+ in existing designs.
What is the typical on-resistance flatness across channels for the MAX328CWE+?
The MAX328CWE+ exhibits ≤2% variation in on-resistance between channels, calculated as [RDS(ON) Max – RDS(ON) Min] / RDS(ON) Ave × 100%. The datasheet specifies this parameter as "Greatest Change in Drain-Source On-Resistance Between Channels" with a typical value of 2% and max of 2% at +25°C, confirming excellent channel matching critical for gain-accuracy in programmable-gain amplifier stages using the MAX328CWE+.
Can the MAX328CWE+ operate with unbalanced supply voltages such as +12V and –5V?
Yes - the MAX328CWE+ is explicitly characterized for unbalanced supply operation. The General Description states it "performs well with unbalanced combinations of supply voltage, such as +12V and –5V or +5V and –15V." This behavior is enabled by its CMOS transmission-gate architecture and independent logic-level referencing, and is verified across all electrical specifications in the datasheet, including leakage, on-resistance, and switching time.
MAX328CWE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- 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+ FAQ
1.How can I place an order for MAX328CWE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX328CWE+ 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+ reliable?
The price and inventory of MAX328CWE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX328CWE+ is usually 5 days.
3.What payment methods are accepted for MAX328CWE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX328CWE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX328CWE+?
MAX328CWE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX328CWE+ 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+?
For technical support, including MAX328CWE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX328CWE+ requirements.
6.How does Aetrix verify that MAX328CWE+ is sourced from the original manufacturer or authorized distributors?
All MAX328CWE+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX328CWE+?
All MAX328CWE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX328CWE+, 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+ part is unused and in its original packaging.
Return procedure for MAX328CWE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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