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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:299
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Product details
Overview
The MAX328EWE+ 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 operates across -40°C to +85°C. It serves as a pin-for-pin replacement for DG508 in high-impedance sensor front-ends feeding op amps or ADCs.
For engineers reviewing the MAX328EWE+ datasheet, MAX328EWE+ pinout, MAX328EWE+ application, or MAX328EWE+ equivalent, this device is selected for low-error analog switching where leakage-induced offset, rail-to-rail signal swing, and AC fault survivability (e.g., 120V AC indefinite withstand) are critical design constraints.
Technical Context
The MAX328EWE+ implements an 8-channel single-pole analog switch controlled by three address bits (A0–A2) and an active-high enable (EN). Its CMOS transmission-gate architecture supports bidirectional signal flow and maintains analog-signal range from V− to V+, enabling true rail-to-rail operation with ±5V to ±18V supplies or 10V–30V single supply.
Internal latchup-proof construction and guaranteed 1pA max off-leakage at +25°C-tested 100% at max operating temperature-enable use in high-source-impedance circuits without significant error voltage buildup. Break-before-make timing (0.2µs) prevents channel shorting during address transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Analog Signal Range | ±15V - Supports full rail-to-rail input/output swing with ±15V supplies, eliminating level-shifting needs in bipolar signal chains. |
| On-Resistance (RDS(ON)) | 2.5kΩ typ - Low enough to minimize IR drop in 10kΩ+ source impedance paths; variation ≤2% ensures channel matching in precision ratiometric measurements. |
| Off-Leakage Current | 1pA typ at +25°C - Generates <40nV error across 40kΩ external resistor, enabling 17-bit resolution over temperature in fault-tolerant mux designs. |
| Switching Time | 1.5µs max - Enables sampling rates up to ~300kHz in time-multiplexed acquisition systems without aperture jitter dominance. |
| Supply Range | ±5V to ±18V dual or 10V–30V single - Allows direct integration into industrial PLC I/O modules using standard ±15V or +24V rails. |
| Enable Propagation Delay | tON(EN) = 1.5µs max - Ensures deterministic channel activation timing for synchronized multi-mux sequencing in automated test equipment. |
Pinout & Package
MAX328EWE+ uses a 16-pin Wide SO (SOIC-W) RoHS-compliant package with exposed pad (EP connected to V+ per datasheet).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 4–7, 9–12 | S1–S8 (Analog Inputs) | Bidirectional analog channels; S1–S4 on pins 4–7, S5–S8 on pins 9–12 - enables flexible PCB layout with grouped inputs for differential or sequential scanning. |
| 2 | EN (Enable) | Active-high digital control; asserts all switches when high - allows global mux shutdown to isolate signal path during power-down or fault conditions. |
| 8 | D (Common Output) | Single bidirectional analog node - connects to ADC input, op-amp inverting input, or instrumentation amplifier reference point. |
| 13–14 | V+, GND | Positive supply and ground reference - GND pin (14) is separate from substrate; decoupling must be local to minimize ground bounce in high-speed switching. |
| 15–16 | A0, A1, A2 (Address) | 3-bit binary select lines - A0 (pin 15), A1 (16), A2 (13); logic thresholds (VAL ≤0.8V, VAH ≥2.4V) ensure robust TTL/CMOS interfacing without level shifters. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low off-leakage (1pA typ) | Enables direct connection to >100MΩ sensor sources (e.g., piezoelectric transducers, pH electrodes) without measurable offset drift. |
| Rail-to-rail analog range | Eliminates clipping of ±10V industrial sensor outputs when powered from ±15V rails, preserving full dynamic range in data loggers. |
| Pin-compatible with DG508/DG509 | Allows drop-in upgrade in legacy designs without PCB rework, delivering 10× lower leakage and improved fault tolerance. |
| Fault-tolerant architecture | With external 39kΩ resistors, withstands indefinite 120V AC line faults while maintaining sub-µV error - certified for use in aircraft HUD and medical isolation barriers. |
| Latchup-proof CMOS process | Guarantees immunity to destructive latchup under transient overvoltage or ESD events in ungrounded portable instrumentation. |
Applications
| Industrial Data Acquisition | Aircraft Heads-Up Display (HUD) |
|---|---|
Use Scenario: Multiplexing 8 thermocouple or RTD inputs into a single 24-bit sigma-delta ADC in a programmable logic controller. IC Role / Device Role / Timing Role: Analog signal router selecting one of eight high-impedance sensor outputs per conversion cycle; EN synchronized to ADC start pulse. Use Value: 1pA leakage ensures <1µV offset error across 100kΩ cold-junction compensation network, preserving ±0.1°C measurement accuracy. |
Use Scenario: Routing critical flight parameter signals (airspeed, attitude, altitude) to redundant display drivers in military HUD systems. IC Role / Device Role / Timing Role: Fault-isolated signal selector ensuring uninterrupted display feed during lightning-induced 120V AC transients on avionics bus lines. Use Value: Indefinite 120V AC fault withstand with no component damage or signal corruption meets DO-160 Section 22 Level A lightning surge requirements. |
| Medical Patient Monitoring | Test & Measurement Equipment |
Use Scenario: Switching ECG electrode leads into a high-input-impedance instrumentation amplifier front-end in portable patient monitors. IC Role / Device Role / Timing Role: Bidirectional analog switch enabling lead-off detection and automatic channel calibration via reverse current injection. Use Value: Rail-to-rail operation preserves full ±5V ECG waveform amplitude with ±15V supplies; 2.5kΩ RDS(ON) avoids gain error in 100kΩ feedback networks. |
Use Scenario: Channel selection in automated test equipment performing parametric testing of op-amps and precision references. IC Role / Device Role / Timing Role: Precision signal path manager routing DUT outputs to multiple measurement instruments (DMM, scope, spectrum analyzer) without cross-talk. Use Value: 84dB off-isolation at 500kHz prevents crosstalk between 10MHz bandwidth test signals; 1.5µs switching enables 300kHz test sequence throughput. |
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 for MAX328EWE+; identical leakage spec. | Not qualified for extended temperature industrial or automotive environments requiring -40°C startup. | Select MAX328EWE+ when operating below 0°C or above +70°C is required; MAX358EWE+ suits commercial-grade benchtop instruments. |
| ADG508AKRZ-REEL7 | 1pA max off-leakage at +25°C (same), but 4.5kΩ RDS(ON); requires dual ±15V supply only (no 10–30V single-supply mode); not fault-rated. | Lacks integrated fault-protection capability; external diode/resistor network needed for 120V AC survival, increasing BOM count and board area. | Choose MAX328EWE+ when fault tolerance, single-supply flexibility, or lower on-resistance is mandatory; ADG508AKRZ suits cost-sensitive, non-fault-critical applications. |
Compared with MAX358EWE+, the MAX328EWE+ delivers extended temperature support and lower on-resistance for higher accuracy in harsh environments; versus ADG508AKRZ-REEL7, it offers native fault tolerance and broader supply flexibility, reducing system-level protection circuitry.
Availability
MAX328EWE+ is available at Aetrix Electronics and suitable for industrial data acquisition, aircraft avionics, and medical patient monitoring systems 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, communications, and computing markets.
The MAX328EWE+ belongs to Maxim's ultra-low-leakage analog switch product line, engineered specifically for precision data-acquisition systems where signal integrity, fault resilience, and temperature stability are non-negotiable.
FAQ
What is the maximum continuous analog signal voltage the MAX328EWE+ can handle?
The MAX328EWE+ supports analog signals from V− to V+, with absolute maximum ratings of −2V to (V+ + 2V) on any terminal. When operated with ±15V supplies, it safely handles ±15V analog inputs. With 120V AC fault protection enabled via external 39kΩ resistors, it withstands indefinite exposure to 120V AC line faults without damage, making MAX328EWE+ ideal for industrial and avionics safety-critical interfaces.
Does the MAX328EWE+ require external components for basic operation?
No, the MAX328EWE+ functions as a standalone 1-of-8 analog multiplexer with only V+, V−, GND, address inputs (A0–A2), enable (EN), and analog I/O connections. External 39kΩ resistors are optional and used only when implementing fault-tolerant operation per Figure 4 in the datasheet. For standard precision switching, MAX328EWE+ needs no additional passive components beyond standard supply decoupling capacitors.
Is the MAX328EWE+ pin-compatible with the DG508 series?
Yes, the MAX328EWE+ is explicitly specified as a pin-for-pin replacement for the DG508 and DG509 in all applications. Pin assignments for address inputs, enable, analog channels, and power terminals match exactly between MAX328EWE+ (Wide SO) and DG508 (16-pin DIP/SO), enabling direct substitution without PCB modification while delivering superior leakage performance and fault tolerance.
What is the typical on-resistance temperature coefficient of the MAX328EWE+?
The MAX328EWE+ exhibits a typical on-resistance of 2.5kΩ at +25°C, rising to 4kΩ maximum over the full −40°C to +85°C operating range. This corresponds to a worst-case temperature coefficient of approximately 2000ppm/°C, which is well-characterized and stable across the range - critical for ratiometric measurements where channel-to-channel RDS(ON) matching (≤2%) dominates error budget over temperature.
Can the MAX328EWE+ operate from a single 24V supply?
Yes, the MAX328EWE+ supports single-supply operation from 10V to 30V. With a +24V supply and GND referenced as V−, the analog signal range extends from 0V to +24V. The device maintains its 1pA leakage spec and 2.5kΩ on-resistance under these conditions, making MAX328EWE+ suitable for 24V industrial control systems without requiring negative rails or level-shifting circuitry.
MAX328EWE+ 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:
- -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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