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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:2,936
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Product details
Overview
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 switch in high-impedance data-acquisition front-ends, enabling fault-tolerant operation when paired with external 40kΩ input resistors.
For engineers reviewing the MAX328CWE datasheet, MAX328CWE pinout, MAX328CWE application, or MAX328CWE equivalent, key selection criteria include guaranteed sub-1pA leakage at +70°C, break-before-make timing (0.2µs), TTL/CMOS logic compatibility, rail-to-rail analog signal range, and pin compatibility with DG508 and MAX358 in legacy designs.
Technical Context
The MAX328CWE implements a CMOS transmission-gate architecture with latchup-proof construction and bidirectional analog signal paths. Its address decoding logic (A0–A2) selects one of eight input channels (S1–S8) to the common bidirectional output D, controlled by an active-high EN pin.
It operates across unbalanced supply configurations (e.g., +12V/–5V) and maintains analog-signal integrity from –15V to +15V with <±5% RDS(ON) variation between channels. Leakage performance is 100% tested at maximum rated temperature (+70°C for C-grade), not just correlated.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Analog Signal Range | –15V to +15V - supports rail-to-rail input/output swing with ±15V supplies |
| On-Resistance (RDS(ON)) | 2.5kΩ typ - ensures minimal gain error and settling time impact in precision op-amp interfaces |
| Off-Leakage Current | 1pA typ at +25°C - enables <0.4nV error with 40kΩ series resistor in fault-tolerant designs |
| Switching Time | 1.5µs max - supports sampling rates up to ~300kHz in multiplexed ADC systems |
| Power Supply Range | ±5V to ±18V dual or 10V–30V single - accommodates industrial and avionics supply rails |
| Enable Turn-On/Off Time | 1.5µs / 1.0µs - allows tight synchronization with system clock or control logic |
| Off-Isolation (OIRR) | 84dB at 500kHz - suppresses crosstalk between inactive channels in multi-channel DAQ |
Pinout & Package
MAX328CWE is supplied in a 16-pin Wide SO (SOIC-W) RoHS-compliant package with exposed pad (EP), footprint compatible with standard 16-pin wide-body SOIC land pattern (Maxim land pattern no. 90-0107).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | V− | Negative supply rail connection; must be referenced to GND for proper biasing of internal CMOS switches |
| 2–7 | S1–S4 | Bidirectional analog inputs; S1–S4 occupy pins 2–5, S5–S8 occupy pins 9–12 per top-view diagram |
| 8 | D | Common bidirectional analog output; connects selected channel (S1–S8) when EN = high |
| 9–12 | S5–S8 | Bidirectional analog inputs; continuation of 8-channel set; all Sx pins support rail-to-rail signals |
| 13 | A2 | MSB address input; controls channel selection with A1/A0 per truth table (EN must be high) |
| 14 | A1 | Address input; together with A0/A2, decodes one of eight channels (0–7) |
| 15 | A0 | LSB address input; full 3-bit binary decode determines active channel |
| 16 | EN | Active-high enable; disables all switches (high-Z state) when low; critical for power gating and fault isolation |
| 11 | V+ | Positive supply rail; must be ≥|V−| + 10V for specified RDS(ON) and leakage performance |
| 12 | GND | Ground reference for digital logic and substrate bias; separate from analog ground in mixed-signal layouts |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low off-leakage (1pA typ) | Enables <0.4nV offset error with 40kΩ input protection resistors-critical for 17-bit resolution over temperature |
| Bidirectional analog path | Supports both multiplexer (S→D) and demultiplexer (D→S) configurations without signal polarity constraints |
| Pin-compatible with DG508/MAX358 | Allows drop-in replacement in existing PCB layouts using 16-pin DIP or SO footprints |
| Rail-to-rail analog signal range | Permits direct interfacing with op-amps and ADCs operating at supply rails-no level-shifting required |
| Break-before-make switching | Guarantees 0.2µs minimum inter-channel isolation-prevents momentary shorting during channel transitions |
Applications
| Data-Acquisition Systems | Control Systems |
|---|---|
Use Scenario: Multiplexing multiple sensor outputs (thermocouples, strain gauges) into a single high-resolution ADC. IC Role / Device Role / Timing Role: Precision analog switch routing low-current, high-impedance signals while preserving microvolt-level accuracy. Use Value: Sub-1pA leakage prevents signal degradation; 2.5kΩ RDS(ON) minimizes gain error in buffered front-end configurations. |
Use Scenario: Selecting among feedback sensor inputs (position, current, voltage) in closed-loop motor drives. IC Role / Device Role / Timing Role: Fault-isolated analog mux enabling safe reconfiguration without interrupting control loop stability. Use Value: Withstandable 120V AC faults indefinitely; break-before-make timing avoids transient control errors during channel change. |
| Aircraft Heads-Up Displays | Signal Routing |
Use Scenario: Routing calibration reference voltages and display driver signals in safety-critical HUD electronics. IC Role / Device Role / Timing Role: High-reliability analog switch operating across extended temperature (–55°C to +125°C variants available) and supply variations. Use Value: Guaranteed leakage tested at +70°C ensures long-term stability; ±18V supply tolerance accommodates avionics power buses. |
Use Scenario: Dynamic reconfiguration of test equipment signal paths (e.g., automated calibration fixtures). IC Role / Device Role / Timing Role: Bidirectional, logic-controlled analog switch supporting both forward (source→output) and reverse (output→source) signal flow. Use Value: TTL/CMOS-compatible EN and address inputs simplify integration with FPGA or microcontroller GPIO; 1.5µs switching enables rapid test sequencing. |
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 (5nA vs. 1pA), 100Ω higher RDS(ON), no fault-tolerance design support | Limited to non-fault-critical, lower-precision systems; lacks integrated diode protection | Select only if legacy footprint compatibility is mandatory and leakage <100pA is acceptable |
| MAX358CWE+ | Same pinout and function but rated for –40°C to +85°C (E-grade); identical leakage and RDS(ON) specs | Required for industrial environments exceeding +70°C ambient; same fault-tolerant capability | Choose MAX358CWE+ when extended temperature operation is needed without layout change |
Compared with DG508ACJ, MAX328CWE delivers 5000× lower leakage and proven 120V AC fault resilience; versus MAX358CWE+, it trades extended temperature range for cost-sensitive commercial-grade operation-both share identical electrical behavior at +25°C.
Availability
MAX328CWE is available at Aetrix Electronics and suitable for data-acquisition systems, control systems, aircraft heads-up displays, and signal-routing applications requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
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 computing markets.
The MAX328 belongs to Maxim's ultra-low-leakage analog switch product line, designed specifically for precision data-acquisition and fault-tolerant signal routing where sub-picoampere leakage and rail-to-rail operation are mandatory.
FAQ
What is the maximum continuous analog signal voltage range supported by the MAX328CWE?
The MAX328CWE supports an analog signal range of –15V to +15V when operated with ±15V supplies. This rail-to-rail capability is maintained across its full specified supply range (±5V to ±18V dual or 10V–30V single). The device's internal structure allows signals to swing beyond typical CMOS limits, making MAX328CWE suitable for interfacing directly with op-amps and ADCs without level-shifting circuitry.
Does the MAX328CWE require external protection diodes for fault tolerance?
No, the MAX328CWE does not require external protection diodes. Its internal diode structure limits input voltage to ±15.7V with ±15V supplies, enabling indefinite 120V AC fault withstand when used with external 39kΩ or higher series resistors. This integrated protection eliminates the need for discrete diodes required by conventional multiplexers-reducing bill-of-materials count and board space in MAX328CWE-based designs.
How does the enable (EN) pin function in the MAX328CWE?
The EN pin on the MAX328CWE is an active-high control that globally enables or disables all eight analog switches. When EN is low, all channels are open-circuited (high-Z state), isolating inputs from the output D. When EN is high, channel selection proceeds via A0–A2. This feature allows system-level power gating, fault isolation, and synchronized channel activation-critical for reducing leakage in standby modes and preventing signal coupling during configuration changes in the MAX328CWE.
Is the MAX328CWE pin-compatible with the DG508 in existing PCB layouts?
Yes, the MAX328CWE is pin-for-pin compatible with the DG508 in 16-pin SO and DIP packages. Pin assignments for V+, V−, GND, EN, A0–A2, S1–S8, and D match exactly. This allows direct replacement without PCB modification, delivering immediate improvements in leakage (1pA vs. 5nA), on-resistance consistency, and fault tolerance-while maintaining full functional equivalence in the MAX328CWE.
What is the guaranteed maximum off-leakage current for the MAX328CWE at its maximum operating temperature?
The MAX328CWE guarantees off-leakage current of ≤10nA at its maximum rated operating temperature of +70°C. This specification is 100% production-tested-not just correlated-ensuring reliability in commercial-grade applications. At +25°C, typical off-leakage is 1pA, rising to ≤10nA at +70°C per datasheet Table "Overtemperature" section. This verified performance under worst-case thermal conditions makes MAX328CWE suitable for precision systems where leakage-induced errors must remain bounded.
MAX328CWE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tube
- 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 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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