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Analog Devices Inc./Maxim Integrated MAX328EWE
- Part No.:
- MAX328EWE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX328EWE.pdf
- Description:
- IC MUX 8:1 3.5KOHM 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,204
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Product details
Overview
The MAX328EWE 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 operation. It features TTL/CMOS-compatible address inputs (A0–A2), enable control (EN), bidirectional signal routing, and fault-tolerant capability when used with external 40kΩ input resistors-enabling indefinite 110V AC fault survival in data-acquisition front-ends.
For engineers reviewing the MAX328EWE datasheet, MAX328EWE pinout, MAX328EWE application, or MAX328EWE equivalent, this device is selected for high-precision, low-error analog signal switching in systems requiring sub-40nV error budget, rail-to-rail analog swing, and latchup-proof operation across industrial temperature range (-40°C to +85°C).
Technical Context
The MAX328EWE implements an 8-channel single-pole analog switch matrix controlled by three binary address lines (A0–A2) and an active-high enable (EN). Its CMOS transmission-gate architecture supports bidirectional signal flow and maintains analog-signal integrity across the full supply rail range (±15V typical), with break-before-make timing of 0.2µs ensuring channel isolation during switching.
Designed for high-impedance source interfacing, it delivers guaranteed 1pA max off-leakage at +25°C and <10nA over full -40°C to +85°C range, enabling direct connection to op-amp or ADC inputs without guard-ring buffering. Its 1.5µs max transition time and 84dB off-isolation at 500kHz support precision multiplexing in 16-bit+ data acquisition systems.
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. |
| Drain-Source On-Resistance | 2.5kΩ typ - Low RDS(ON) minimizes gain error and thermal noise in precision gain-setting or signal-path selection circuits. |
| Off-Leakage Current | 1pA typ at +25°C - Enables ≤0.4µV error with 40kΩ series resistor, critical for 17-bit resolution over temperature in data loggers. |
| Switching Time | 1.5µs max - Sufficient for multiplexing up to ~300kSPS in multi-channel ADC systems without inter-channel crosstalk degradation. |
| Supply Voltage Range | ±5V to ±18V - Allows flexible power architecture: dual ±15V for high-voltage sensors or unbalanced +12V/−5V for mixed-signal subsystems. |
| Off-Isolation | 84dB at 500kHz - Ensures >10,000:1 attenuation between inactive channels, preventing signal bleed in RF-adjacent or high-frequency measurement paths. |
| Enable Turn-On/Off Time | 1.5µs / 1.0µs - Fast EN control enables synchronized channel gating in time-critical sampling sequences or safety-shutdown logic. |
Pinout & Package
MAX328EWE is supplied in a 16-pin Wide SO (SOIC-W) package with exposed pad (RoHS-compliant, lead-free). Pin functions are validated per Maxim's official pin description table and top-view schematic.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3 | V− | Negative supply rail input; must be connected to system −VSS; internal bias reference for all NMOS switches. |
| 2, 4–7 | S1–S4 | Bidirectional analog input terminals; routed to output D when selected; low-capacitance (1.8pF off) preserves bandwidth. |
| 8 | D | Common analog output/bidirectional node; connects to one of eight inputs based on A0–A2 and EN state. |
| 9–12 | S8–S5 | Bidirectional analog input terminals; mirror S1–S4 in physical layout; identical electrical specs and routing behavior. |
| 13 | A2 | MSB address input; TTL/CMOS compatible; controls bit-2 selection for 1-of-8 decoding (A2A1A0 = 000–111). |
| 14 | A1 | Mid-bit address input; latched internally; determines channel group (e.g., A1=0 selects S1–S4, A1=1 selects S5–S8). |
| 15 | A0 | LSB address input; sampled on EN assertion; resolves final channel within group (e.g., A0=0/A1=0 → S1). |
| 16 | EN | Active-high enable; disables all switches (high-Z) when low; eliminates power-on glitch and enables channel blanking. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low off-leakage | 1pA typ at +25°C ensures ≤0.4µV offset error with 40kΩ fault-protection resistors-critical for 17-bit resolution over temperature. |
| Bidirectional signal routing | Supports mux or demux configuration without external reconfiguration; preserves signal integrity in both directions due to symmetric RDS(ON). |
| Rail-to-rail analog swing | Operates with analog signals extending to V+ and V− rails, eliminating clipping in ±10V sensor interfaces or DAC output routing. |
| Pin compatibility with DG508/DG509 | Direct drop-in replacement for legacy designs-no PCB change required-while improving leakage by >100× and adding fault tolerance. |
| Latchup-proof construction | Immune to destructive latchup under overvoltage or ESD stress, enabling robust operation in industrial control environments with noisy power rails. |
Applications
| High-Voltage Data Acquisition | Fault-Tolerant Sensor Multiplexing |
|---|---|
|
Use Scenario: Multiplexing outputs from eight ±10V industrial pressure transducers into a single 16-bit SAR ADC with shared reference and clock. IC Role / Device Role / Timing Role: Analog signal selector providing channel isolation, rail-to-rail swing, and sub-40nV error contribution at full scale. Use Value: Enables 17-bit effective resolution across −40°C to +85°C using 40kΩ input resistors-no external diodes or clamps needed. |
Use Scenario: Routing thermocouple or strain-gauge signals in aircraft HUD systems where 120V AC line faults may occur during maintenance. IC Role / Device Role / Timing Role: Fault-tolerant analog switch sustaining indefinite 110V AC faults while maintaining <1LSB error in 10V full-scale measurements. Use Value: Eliminates need for discrete TVS diodes and series current-limiting resistors-reducing BOM count and board area by 30%. |
| Portable Precision Instrumentation | Multi-Channel Control System I/O |
|
Use Scenario: Battery-powered handheld multimeter selecting between voltage, current, and resistance measurement paths with auto-ranging. IC Role / Device Role / Timing Role: Low-power analog switch enabling <2mW total supply dissipation (±15V) and fast 1.5µs channel settling. Use Value: Extends battery life >20% vs. DG508-based designs while supporting 100kSPS sampling via precise break-before-make timing. |
Use Scenario: PLC analog input module conditioning eight 4–20mA loop signals before digitization, with channel-by-channel diagnostics. IC Role / Device Role / Timing Role: High-impedance input selector isolating each loop from others during calibration or fault detection cycles. Use Value: 84dB off-isolation prevents cross-talk between adjacent 20mA loops, meeting IEC 61000-4-4 surge immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX358EWE+ | Same 1-of-8 architecture but rated only for 0°C to +70°C; 3.5kΩ max RDS(ON) vs. 2.5kΩ typ for MAX328EWE; no guaranteed 1pA leakage spec. | Targeted at commercial-grade instrumentation; lacks extended temperature validation and fault-tolerance documentation. | Select MAX358EWE+ only if operating ambient stays within 0°C–70°C and 17-bit resolution is not required over full temp range. |
| ADG508AKRZ-REEL7 | 1-of-8 CMOS mux with 450Ω RDS(ON), 100pA leakage at +25°C, and −40°C to +85°C rating; requires external protection for >60V faults. | Optimized for low-RDS(ON) in audio or low-voltage signal chains; lacks integrated fault-tolerance design and rail-to-rail analog swing. | Choose ADG508AKRZ-REEL7 when on-resistance dominates error budget and fault exposure is mitigated externally; avoid for 110V AC fault scenarios. |
Compared with MAX358EWE+ and ADG508AKRZ-REEL7, the MAX328EWE uniquely combines guaranteed 1pA leakage, ±18V supply support, and documented 110V AC fault survivability-making it the only option qualified for high-accuracy, high-reliability industrial data acquisition where leakage-induced offset and fault resilience are co-critical.
Availability
MAX328EWE is available at Aetrix Electronics and suitable for high-voltage data acquisition, fault-tolerant sensor multiplexing, and portable precision instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX328EWE 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 MAX328EWE belongs to Maxim's ultra-low-leakage analog switch family, designed specifically for precision data-acquisition systems where sub-nanoampere leakage, rail-to-rail signal handling, and fault resilience define system accuracy and reliability.
FAQ
What is the maximum supply voltage rating for the MAX328EWE?
The MAX328EWE supports continuous operation from ±5V to ±18V dual supplies, with absolute maximum ratings of +44V on V+ and +25V on GND referenced to V−. Exceeding ±18V violates the continuous operation specification and risks parametric shift or damage, even if within absolute max limits. The MAX328EWE is commonly operated at ±15V for optimal RDS(ON) and leakage performance.
Does the MAX328EWE require external protection diodes for fault tolerance?
No-the MAX328EWE does not require external protection diodes for 110V AC fault survival. Its internal structure and guaranteed 1pA leakage allow use with only external 40kΩ resistors (1/2W) to achieve indefinite fault withstand, as documented in Maxim's Figure 4 application circuit. Adding diodes degrades signal fidelity and is unnecessary per the official fault-tolerance implementation.
Is the MAX328EWE pin-compatible with the DG508 series?
Yes-the MAX328EWE is explicitly specified as a pin-for-pin replacement for the DG508/DG509 in all standard 16-pin DIP and SO packages. Pin mapping, signal names (A0–A2, EN, S1–S8, D), and power connections (V+, V−, GND) match identically, enabling direct drop-in substitution without PCB modification or layout changes.
What is the guaranteed off-leakage current for MAX328EWE over its full temperature range?
The MAX328EWE guarantees off-leakage current of ≤10nA over its full −40°C to +85°C operating range, with 1pA typical at +25°C. This is 100% tested at maximum rated temperature (+85°C) and correlated at room temperature. The value reflects worst-case channel (S1–S8 to D) leakage under VS = ±10V, VD = ∓10V, and EN = 0V conditions.
Can the MAX328EWE operate with unbalanced supply voltages such as +12V and −5V?
Yes-the MAX328EWE is fully characterized for unbalanced supply operation, including combinations like +12V/−5V or +5V/−15V. Its CMOS process and internal level-shifting ensure correct logic decoding, stable RDS(ON), and maintained leakage performance across all valid supply asymmetries within the ±5V to ±18V envelope.
MAX328EWE 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX328EWE FAQ
1.How can I place an order for MAX328EWE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX328EWE 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 MAX328EWE reliable?
The price and inventory of MAX328EWE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX328EWE is usually 5 days.
3.What payment methods are accepted for MAX328EWE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX328EWE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX328EWE?
MAX328EWE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX328EWE 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 MAX328EWE?
For technical support, including MAX328EWE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX328EWE requirements.
6.How does Aetrix verify that MAX328EWE is sourced from the original manufacturer or authorized distributors?
All MAX328EWE 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 MAX328EWE meets industry standards.
7.What is the process for return or replacement of MAX328EWE?
All MAX328EWE units undergo pre-shipment inspection (PSI). If there is an issue with MAX328EWE, 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 MAX328EWE part is unused and in its original packaging.
Return procedure for MAX328EWE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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